sys/dev/netif/em/if_em.c

   1 /*
   2  * Copyright (c) 2004 Joerg Sonnenberger <joerg@bec.de>.  All rights reserved.
   3  *
   4  * Copyright (c) 2001-2014, Intel Corporation
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are met:
   9  *
  10  *  1. Redistributions of source code must retain the above copyright notice,
  11  *     this list of conditions and the following disclaimer.
  12  *
  13  *  2. Redistributions in binary form must reproduce the above copyright
  14  *     notice, this list of conditions and the following disclaimer in the
  15  *     documentation and/or other materials provided with the distribution.
  16  *
  17  *  3. Neither the name of the Intel Corporation nor the names of its
  18  *     contributors may be used to endorse or promote products derived from
  19  *     this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  *
  34  * Copyright (c) 2005 The DragonFly Project.  All rights reserved.
  35  *
  36  * This code is derived from software contributed to The DragonFly Project
  37  * by Matthew Dillon <dillon@backplane.com>
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  *
  43  * 1. Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in
  47  *    the documentation and/or other materials provided with the
  48  *    distribution.
  49  * 3. Neither the name of The DragonFly Project nor the names of its
  50  *    contributors may be used to endorse or promote products derived
  51  *    from this software without specific, prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  54  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  55  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  56  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  57  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  58  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  59  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  60  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  61  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  62  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  63  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  */
  67 /*
  68  * SERIALIZATION API RULES:
  69  *
  70  * - We must call lwkt_serialize_handler_enable() prior to enabling the
  71  *   hardware interrupt and lwkt_serialize_handler_disable() after disabling
  72  *   the hardware interrupt in order to avoid handler execution races from
  73  *   scheduled interrupt threads.
  74  */
  75
  76 #include "opt_ifpoll.h"
  77
  78 #include <sys/param.h>
  79 #include <sys/bus.h>
  80 #include <sys/endian.h>
  81 #include <sys/interrupt.h>
  82 #include <sys/kernel.h>
  83 #include <sys/ktr.h>
  84 #include <sys/malloc.h>
  85 #include <sys/mbuf.h>
  86 #include <sys/proc.h>
  87 #include <sys/rman.h>
  88 #include <sys/serialize.h>
  89 #include <sys/socket.h>
  90 #include <sys/sockio.h>
  91 #include <sys/sysctl.h>
  92 #include <sys/systm.h>
  93
  94 #include <net/bpf.h>
  95 #include <net/ethernet.h>
  96 #include <net/if.h>
  97 #include <net/if_arp.h>
  98 #include <net/if_dl.h>
  99 #include <net/if_media.h>
 100 #include <net/if_poll.h>
 101 #include <net/ifq_var.h>
 102 #include <net/vlan/if_vlan_var.h>
 103 #include <net/vlan/if_vlan_ether.h>
 104
 105 #include <netinet/ip.h>
 106 #include <netinet/tcp.h>
 107 #include <netinet/udp.h>
 108
 109 #include <bus/pci/pcivar.h>
 110 #include <bus/pci/pcireg.h>
 111
 112 #include <dev/netif/ig_hal/e1000_api.h>
 113 #include <dev/netif/ig_hal/e1000_82571.h>
 114 #include <dev/netif/em/if_em.h>
 115
 116 #define DEBUG_HW 0
 117
 118 #define EM_NAME "Intel(R) PRO/1000 Network Connection "
 119 #define EM_VER  " 7.4.2"
 120
 121 #define _EM_DEVICE(id, ret)     \
 122         { EM_VENDOR_ID, E1000_DEV_ID_##id, ret, EM_NAME #id EM_VER }
 123 #define EM_EMX_DEVICE(id)       _EM_DEVICE(id, -100)
 124 #define EM_DEVICE(id)           _EM_DEVICE(id, 0)
 125 #define EM_DEVICE_NULL  { 0, 0, 0, NULL }
 126
 127 static const struct em_vendor_info em_vendor_info_array[] = {
 128         EM_DEVICE(82540EM),
 129         EM_DEVICE(82540EM_LOM),
 130         EM_DEVICE(82540EP),
 131         EM_DEVICE(82540EP_LOM),
 132         EM_DEVICE(82540EP_LP),
 133
 134         EM_DEVICE(82541EI),
 135         EM_DEVICE(82541ER),
 136         EM_DEVICE(82541ER_LOM),
 137         EM_DEVICE(82541EI_MOBILE),
 138         EM_DEVICE(82541GI),
 139         EM_DEVICE(82541GI_LF),
 140         EM_DEVICE(82541GI_MOBILE),
 141
 142         EM_DEVICE(82542),
 143
 144         EM_DEVICE(82543GC_FIBER),
 145         EM_DEVICE(82543GC_COPPER),
 146
 147         EM_DEVICE(82544EI_COPPER),
 148         EM_DEVICE(82544EI_FIBER),
 149         EM_DEVICE(82544GC_COPPER),
 150         EM_DEVICE(82544GC_LOM),
 151
 152         EM_DEVICE(82545EM_COPPER),
 153         EM_DEVICE(82545EM_FIBER),
 154         EM_DEVICE(82545GM_COPPER),
 155         EM_DEVICE(82545GM_FIBER),
 156         EM_DEVICE(82545GM_SERDES),
 157
 158         EM_DEVICE(82546EB_COPPER),
 159         EM_DEVICE(82546EB_FIBER),
 160         EM_DEVICE(82546EB_QUAD_COPPER),
 161         EM_DEVICE(82546GB_COPPER),
 162         EM_DEVICE(82546GB_FIBER),
 163         EM_DEVICE(82546GB_SERDES),
 164         EM_DEVICE(82546GB_PCIE),
 165         EM_DEVICE(82546GB_QUAD_COPPER),
 166         EM_DEVICE(82546GB_QUAD_COPPER_KSP3),
 167
 168         EM_DEVICE(82547EI),
 169         EM_DEVICE(82547EI_MOBILE),
 170         EM_DEVICE(82547GI),
 171
 172         EM_EMX_DEVICE(82571EB_COPPER),
 173         EM_EMX_DEVICE(82571EB_FIBER),
 174         EM_EMX_DEVICE(82571EB_SERDES),
 175         EM_EMX_DEVICE(82571EB_SERDES_DUAL),
 176         EM_EMX_DEVICE(82571EB_SERDES_QUAD),
 177         EM_EMX_DEVICE(82571EB_QUAD_COPPER),
 178         EM_EMX_DEVICE(82571EB_QUAD_COPPER_BP),
 179         EM_EMX_DEVICE(82571EB_QUAD_COPPER_LP),
 180         EM_EMX_DEVICE(82571EB_QUAD_FIBER),
 181         EM_EMX_DEVICE(82571PT_QUAD_COPPER),
 182
 183         EM_EMX_DEVICE(82572EI_COPPER),
 184         EM_EMX_DEVICE(82572EI_FIBER),
 185         EM_EMX_DEVICE(82572EI_SERDES),
 186         EM_EMX_DEVICE(82572EI),
 187
 188         EM_EMX_DEVICE(82573E),
 189         EM_EMX_DEVICE(82573E_IAMT),
 190         EM_EMX_DEVICE(82573L),
 191
 192         EM_DEVICE(82583V),
 193
 194         EM_EMX_DEVICE(80003ES2LAN_COPPER_SPT),
 195         EM_EMX_DEVICE(80003ES2LAN_SERDES_SPT),
 196         EM_EMX_DEVICE(80003ES2LAN_COPPER_DPT),
 197         EM_EMX_DEVICE(80003ES2LAN_SERDES_DPT),
 198
 199         EM_DEVICE(ICH8_IGP_M_AMT),
 200         EM_DEVICE(ICH8_IGP_AMT),
 201         EM_DEVICE(ICH8_IGP_C),
 202         EM_DEVICE(ICH8_IFE),
 203         EM_DEVICE(ICH8_IFE_GT),
 204         EM_DEVICE(ICH8_IFE_G),
 205         EM_DEVICE(ICH8_IGP_M),
 206         EM_DEVICE(ICH8_82567V_3),
 207
 208         EM_DEVICE(ICH9_IGP_M_AMT),
 209         EM_DEVICE(ICH9_IGP_AMT),
 210         EM_DEVICE(ICH9_IGP_C),
 211         EM_DEVICE(ICH9_IGP_M),
 212         EM_DEVICE(ICH9_IGP_M_V),
 213         EM_DEVICE(ICH9_IFE),
 214         EM_DEVICE(ICH9_IFE_GT),
 215         EM_DEVICE(ICH9_IFE_G),
 216         EM_DEVICE(ICH9_BM),
 217
 218         EM_EMX_DEVICE(82574L),
 219         EM_EMX_DEVICE(82574LA),
 220
 221         EM_DEVICE(ICH10_R_BM_LM),
 222         EM_DEVICE(ICH10_R_BM_LF),
 223         EM_DEVICE(ICH10_R_BM_V),
 224         EM_DEVICE(ICH10_D_BM_LM),
 225         EM_DEVICE(ICH10_D_BM_LF),
 226         EM_DEVICE(ICH10_D_BM_V),
 227
 228         EM_DEVICE(PCH_M_HV_LM),
 229         EM_DEVICE(PCH_M_HV_LC),
 230         EM_DEVICE(PCH_D_HV_DM),
 231         EM_DEVICE(PCH_D_HV_DC),
 232
 233         EM_DEVICE(PCH2_LV_LM),
 234         EM_DEVICE(PCH2_LV_V),
 235
 236         EM_EMX_DEVICE(PCH_LPT_I217_LM),
 237         EM_EMX_DEVICE(PCH_LPT_I217_V),
 238         EM_EMX_DEVICE(PCH_LPTLP_I218_LM),
 239         EM_EMX_DEVICE(PCH_LPTLP_I218_V),
 240         EM_EMX_DEVICE(PCH_I218_LM2),
 241         EM_EMX_DEVICE(PCH_I218_V2),
 242         EM_EMX_DEVICE(PCH_I218_LM3),
 243         EM_EMX_DEVICE(PCH_I218_V3),
 244
 245         /* required last entry */
 246         EM_DEVICE_NULL
 247 };
 248
 249 static int      em_probe(device_t);
 250 static int      em_attach(device_t);
 251 static int      em_detach(device_t);
 252 static int      em_shutdown(device_t);
 253 static int      em_suspend(device_t);
 254 static int      em_resume(device_t);
 255
 256 static void     em_init(void *);
 257 static void     em_stop(struct adapter *);
 258 static int      em_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
 259 static void     em_start(struct ifnet *, struct ifaltq_subque *);
 260 #ifdef IFPOLL_ENABLE
 261 static void     em_npoll(struct ifnet *, struct ifpoll_info *);
 262 static void     em_npoll_compat(struct ifnet *, void *, int);
 263 #endif
 264 static void     em_watchdog(struct ifnet *);
 265 static void     em_media_status(struct ifnet *, struct ifmediareq *);
 266 static int      em_media_change(struct ifnet *);
 267 static void     em_timer(void *);
 268
 269 static void     em_intr(void *);
 270 static void     em_intr_mask(void *);
 271 static void     em_intr_body(struct adapter *, boolean_t);
 272 static void     em_rxeof(struct adapter *, int);
 273 static void     em_txeof(struct adapter *);
 274 static void     em_tx_collect(struct adapter *);
 275 static void     em_tx_purge(struct adapter *);
 276 static void     em_enable_intr(struct adapter *);
 277 static void     em_disable_intr(struct adapter *);
 278
 279 static int      em_dma_malloc(struct adapter *, bus_size_t,
 280                     struct em_dma_alloc *);
 281 static void     em_dma_free(struct adapter *, struct em_dma_alloc *);
 282 static void     em_init_tx_ring(struct adapter *);
 283 static int      em_init_rx_ring(struct adapter *);
 284 static int      em_create_tx_ring(struct adapter *);
 285 static int      em_create_rx_ring(struct adapter *);
 286 static void     em_destroy_tx_ring(struct adapter *, int);
 287 static void     em_destroy_rx_ring(struct adapter *, int);
 288 static int      em_newbuf(struct adapter *, int, int);
 289 static int      em_encap(struct adapter *, struct mbuf **, int *, int *);
 290 static void     em_rxcsum(struct adapter *, struct e1000_rx_desc *,
 291                     struct mbuf *);
 292 static int      em_txcsum(struct adapter *, struct mbuf *,
 293                     uint32_t *, uint32_t *);
 294 static int      em_tso_pullup(struct adapter *, struct mbuf **);
 295 static int      em_tso_setup(struct adapter *, struct mbuf *,
 296                     uint32_t *, uint32_t *);
 297
 298 static int      em_get_hw_info(struct adapter *);
 299 static int      em_is_valid_eaddr(const uint8_t *);
 300 static int      em_alloc_pci_res(struct adapter *);
 301 static void     em_free_pci_res(struct adapter *);
 302 static int      em_reset(struct adapter *);
 303 static void     em_setup_ifp(struct adapter *);
 304 static void     em_init_tx_unit(struct adapter *);
 305 static void     em_init_rx_unit(struct adapter *);
 306 static void     em_update_stats(struct adapter *);
 307 static void     em_set_promisc(struct adapter *);
 308 static void     em_disable_promisc(struct adapter *);
 309 static void     em_set_multi(struct adapter *);
 310 static void     em_update_link_status(struct adapter *);
 311 static void     em_smartspeed(struct adapter *);
 312 static void     em_set_itr(struct adapter *, uint32_t);
 313 static void     em_disable_aspm(struct adapter *);
 314
 315 /* Hardware workarounds */
 316 static int      em_82547_fifo_workaround(struct adapter *, int);
 317 static void     em_82547_update_fifo_head(struct adapter *, int);
 318 static int      em_82547_tx_fifo_reset(struct adapter *);
 319 static void     em_82547_move_tail(void *);
 320 static void     em_82547_move_tail_serialized(struct adapter *);
 321 static uint32_t em_82544_fill_desc(bus_addr_t, uint32_t, PDESC_ARRAY);
 322
 323 static void     em_print_debug_info(struct adapter *);
 324 static void     em_print_nvm_info(struct adapter *);
 325 static void     em_print_hw_stats(struct adapter *);
 326
 327 static int      em_sysctl_stats(SYSCTL_HANDLER_ARGS);
 328 static int      em_sysctl_debug_info(SYSCTL_HANDLER_ARGS);
 329 static int      em_sysctl_int_throttle(SYSCTL_HANDLER_ARGS);
 330 static int      em_sysctl_int_tx_nsegs(SYSCTL_HANDLER_ARGS);
 331 static void     em_add_sysctl(struct adapter *adapter);
 332
 333 /* Management and WOL Support */
 334 static void     em_get_mgmt(struct adapter *);
 335 static void     em_rel_mgmt(struct adapter *);
 336 static void     em_get_hw_control(struct adapter *);
 337 static void     em_rel_hw_control(struct adapter *);
 338 static void     em_enable_wol(device_t);
 339
 340 static device_method_t em_methods[] = {
 341         /* Device interface */
 342         DEVMETHOD(device_probe,         em_probe),
 343         DEVMETHOD(device_attach,        em_attach),
 344         DEVMETHOD(device_detach,        em_detach),
 345         DEVMETHOD(device_shutdown,      em_shutdown),
 346         DEVMETHOD(device_suspend,       em_suspend),
 347         DEVMETHOD(device_resume,        em_resume),
 348         DEVMETHOD_END
 349 };
 350
 351 static driver_t em_driver = {
 352         "em",
 353         em_methods,
 354         sizeof(struct adapter),
 355 };
 356
 357 static devclass_t em_devclass;
 358
 359 DECLARE_DUMMY_MODULE(if_em);
 360 MODULE_DEPEND(em, ig_hal, 1, 1, 1);
 361 DRIVER_MODULE(if_em, pci, em_driver, em_devclass, NULL, NULL);
 362
 363 /*
 364  * Tunables
 365  */
 366 static int      em_int_throttle_ceil = EM_DEFAULT_ITR;
 367 static int      em_rxd = EM_DEFAULT_RXD;
 368 static int      em_txd = EM_DEFAULT_TXD;
 369 static int      em_smart_pwr_down = 0;
 370
 371 /* Controls whether promiscuous also shows bad packets */
 372 static int      em_debug_sbp = FALSE;
 373
 374 static int      em_82573_workaround = 1;
 375 static int      em_msi_enable = 1;
 376
 377 TUNABLE_INT("hw.em.int_throttle_ceil", &em_int_throttle_ceil);
 378 TUNABLE_INT("hw.em.rxd", &em_rxd);
 379 TUNABLE_INT("hw.em.txd", &em_txd);
 380 TUNABLE_INT("hw.em.smart_pwr_down", &em_smart_pwr_down);
 381 TUNABLE_INT("hw.em.sbp", &em_debug_sbp);
 382 TUNABLE_INT("hw.em.82573_workaround", &em_82573_workaround);
 383 TUNABLE_INT("hw.em.msi.enable", &em_msi_enable);
 384
 385 /* Global used in WOL setup with multiport cards */
 386 static int      em_global_quad_port_a = 0;
 387
 388 /* Set this to one to display debug statistics */
 389 static int      em_display_debug_stats = 0;
 390
 391 #if !defined(KTR_IF_EM)
 392 #define KTR_IF_EM       KTR_ALL
 393 #endif
 394 KTR_INFO_MASTER(if_em);
 395 KTR_INFO(KTR_IF_EM, if_em, intr_beg, 0, "intr begin");
 396 KTR_INFO(KTR_IF_EM, if_em, intr_end, 1, "intr end");
 397 KTR_INFO(KTR_IF_EM, if_em, pkt_receive, 4, "rx packet");
 398 KTR_INFO(KTR_IF_EM, if_em, pkt_txqueue, 5, "tx packet");
 399 KTR_INFO(KTR_IF_EM, if_em, pkt_txclean, 6, "tx clean");
 400 #define logif(name)     KTR_LOG(if_em_ ## name)
 401
 402 static int
 403 em_probe(device_t dev)
 404 {
 405         const struct em_vendor_info *ent;
 406         uint16_t vid, did;
 407
 408         vid = pci_get_vendor(dev);
 409         did = pci_get_device(dev);
 410
 411         for (ent = em_vendor_info_array; ent->desc != NULL; ++ent) {
 412                 if (vid == ent->vendor_id && did == ent->device_id) {
 413                         device_set_desc(dev, ent->desc);
 414                         device_set_async_attach(dev, TRUE);
 415                         return (ent->ret);
 416                 }
 417         }
 418         return (ENXIO);
 419 }
 420
 421 static int
 422 em_attach(device_t dev)
 423 {
 424         struct adapter *adapter = device_get_softc(dev);
 425         struct ifnet *ifp = &adapter->arpcom.ac_if;
 426         int tsize, rsize;
 427         int error = 0;
 428         uint16_t eeprom_data, device_id, apme_mask;
 429         driver_intr_t *intr_func;
 430
 431         adapter->dev = adapter->osdep.dev = dev;
 432
 433         callout_init_mp(&adapter->timer);
 434         callout_init_mp(&adapter->tx_fifo_timer);
 435
 436         ifmedia_init(&adapter->media, IFM_IMASK,
 437             em_media_change, em_media_status);
 438
 439         /* Determine hardware and mac info */
 440         error = em_get_hw_info(adapter);
 441         if (error) {
 442                 device_printf(dev, "Identify hardware failed\n");
 443                 goto fail;
 444         }
 445
 446         /* Setup PCI resources */
 447         error = em_alloc_pci_res(adapter);
 448         if (error) {
 449                 device_printf(dev, "Allocation of PCI resources failed\n");
 450                 goto fail;
 451         }
 452
 453         /*
 454          * For ICH8 and family we need to map the flash memory,
 455          * and this must happen after the MAC is identified.
 456          */
 457         if (adapter->hw.mac.type == e1000_ich8lan ||
 458             adapter->hw.mac.type == e1000_ich9lan ||
 459             adapter->hw.mac.type == e1000_ich10lan ||
 460             adapter->hw.mac.type == e1000_pchlan ||
 461             adapter->hw.mac.type == e1000_pch2lan ||
 462             adapter->hw.mac.type == e1000_pch_lpt) {
 463                 adapter->flash_rid = EM_BAR_FLASH;
 464
 465                 adapter->flash = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
 466                                         &adapter->flash_rid, RF_ACTIVE);
 467                 if (adapter->flash == NULL) {
 468                         device_printf(dev, "Mapping of Flash failed\n");
 469                         error = ENXIO;
 470                         goto fail;
 471                 }
 472                 adapter->osdep.flash_bus_space_tag =
 473                     rman_get_bustag(adapter->flash);
 474                 adapter->osdep.flash_bus_space_handle =
 475                     rman_get_bushandle(adapter->flash);
 476
 477                 /*
 478                  * This is used in the shared code
 479                  * XXX this goof is actually not used.
 480                  */
 481                 adapter->hw.flash_address = (uint8_t *)adapter->flash;
 482         }
 483
 484         switch (adapter->hw.mac.type) {
 485         case e1000_82571:
 486         case e1000_82572:
 487         case e1000_pch_lpt:
 488                 /*
 489                  * Pullup extra 4bytes into the first data segment for
 490                  * TSO, see:
 491                  * 82571/82572 specification update errata #7
 492                  *
 493                  * Same applies to I217 (and maybe I218).
 494                  *
 495                  * NOTE:
 496                  * 4bytes instead of 2bytes, which are mentioned in the
 497                  * errata, are pulled; mainly to keep rest of the data
 498                  * properly aligned.
 499                  */
 500                 adapter->flags |= EM_FLAG_TSO_PULLEX;
 501                 /* FALL THROUGH */
 502
 503         default:
 504                 if (pci_is_pcie(dev))
 505                         adapter->flags |= EM_FLAG_TSO;
 506                 break;
 507         }
 508
 509         /* Do Shared Code initialization */
 510         if (e1000_setup_init_funcs(&adapter->hw, TRUE)) {
 511                 device_printf(dev, "Setup of Shared code failed\n");
 512                 error = ENXIO;
 513                 goto fail;
 514         }
 515
 516         e1000_get_bus_info(&adapter->hw);
 517
 518         /*
 519          * Validate number of transmit and receive descriptors.  It
 520          * must not exceed hardware maximum, and must be multiple
 521          * of E1000_DBA_ALIGN.
 522          */
 523         if ((em_txd * sizeof(struct e1000_tx_desc)) % EM_DBA_ALIGN != 0 ||
 524             (adapter->hw.mac.type >= e1000_82544 && em_txd > EM_MAX_TXD) ||
 525             (adapter->hw.mac.type < e1000_82544 && em_txd > EM_MAX_TXD_82543) ||
 526             em_txd < EM_MIN_TXD) {
 527                 if (adapter->hw.mac.type < e1000_82544)
 528                         adapter->num_tx_desc = EM_MAX_TXD_82543;
 529                 else
 530                         adapter->num_tx_desc = EM_DEFAULT_TXD;
 531                 device_printf(dev, "Using %d TX descriptors instead of %d!\n",
 532                     adapter->num_tx_desc, em_txd);
 533         } else {
 534                 adapter->num_tx_desc = em_txd;
 535         }
 536         if ((em_rxd * sizeof(struct e1000_rx_desc)) % EM_DBA_ALIGN != 0 ||
 537             (adapter->hw.mac.type >= e1000_82544 && em_rxd > EM_MAX_RXD) ||
 538             (adapter->hw.mac.type < e1000_82544 && em_rxd > EM_MAX_RXD_82543) ||
 539             em_rxd < EM_MIN_RXD) {
 540                 if (adapter->hw.mac.type < e1000_82544)
 541                         adapter->num_rx_desc = EM_MAX_RXD_82543;
 542                 else
 543                         adapter->num_rx_desc = EM_DEFAULT_RXD;
 544                 device_printf(dev, "Using %d RX descriptors instead of %d!\n",
 545                     adapter->num_rx_desc, em_rxd);
 546         } else {
 547                 adapter->num_rx_desc = em_rxd;
 548         }
 549
 550         adapter->hw.mac.autoneg = DO_AUTO_NEG;
 551         adapter->hw.phy.autoneg_wait_to_complete = FALSE;
 552         adapter->hw.phy.autoneg_advertised = AUTONEG_ADV_DEFAULT;
 553         adapter->rx_buffer_len = MCLBYTES;
 554
 555         /*
 556          * Interrupt throttle rate
 557          */
 558         if (em_int_throttle_ceil == 0) {
 559                 adapter->int_throttle_ceil = 0;
 560         } else {
 561                 int throttle = em_int_throttle_ceil;
 562
 563                 if (throttle < 0)
 564                         throttle = EM_DEFAULT_ITR;
 565
 566                 /* Recalculate the tunable value to get the exact frequency. */
 567                 throttle = 1000000000 / 256 / throttle;
 568
 569                 /* Upper 16bits of ITR is reserved and should be zero */
 570                 if (throttle & 0xffff0000)
 571                         throttle = 1000000000 / 256 / EM_DEFAULT_ITR;
 572
 573                 adapter->int_throttle_ceil = 1000000000 / 256 / throttle;
 574         }
 575
 576         e1000_init_script_state_82541(&adapter->hw, TRUE);
 577         e1000_set_tbi_compatibility_82543(&adapter->hw, TRUE);
 578
 579         /* Copper options */
 580         if (adapter->hw.phy.media_type == e1000_media_type_copper) {
 581                 adapter->hw.phy.mdix = AUTO_ALL_MODES;
 582                 adapter->hw.phy.disable_polarity_correction = FALSE;
 583                 adapter->hw.phy.ms_type = EM_MASTER_SLAVE;
 584         }
 585
 586         /* Set the frame limits assuming standard ethernet sized frames. */
 587         adapter->hw.mac.max_frame_size =
 588             ETHERMTU + ETHER_HDR_LEN + ETHER_CRC_LEN;
 589         adapter->min_frame_size = ETH_ZLEN + ETHER_CRC_LEN;
 590
 591         /* This controls when hardware reports transmit completion status. */
 592         adapter->hw.mac.report_tx_early = 1;
 593
 594         /*
 595          * Create top level busdma tag
 596          */
 597         error = bus_dma_tag_create(NULL, 1, 0,
 598                         BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
 599                         NULL, NULL,
 600                         BUS_SPACE_MAXSIZE_32BIT, 0, BUS_SPACE_MAXSIZE_32BIT,
 601                         0, &adapter->parent_dtag);
 602         if (error) {
 603                 device_printf(dev, "could not create top level DMA tag\n");
 604                 goto fail;
 605         }
 606
 607         /*
 608          * Allocate Transmit Descriptor ring
 609          */
 610         tsize = roundup2(adapter->num_tx_desc * sizeof(struct e1000_tx_desc),
 611                          EM_DBA_ALIGN);
 612         error = em_dma_malloc(adapter, tsize, &adapter->txdma);
 613         if (error) {
 614                 device_printf(dev, "Unable to allocate tx_desc memory\n");
 615                 goto fail;
 616         }
 617         adapter->tx_desc_base = adapter->txdma.dma_vaddr;
 618
 619         /*
 620          * Allocate Receive Descriptor ring
 621          */
 622         rsize = roundup2(adapter->num_rx_desc * sizeof(struct e1000_rx_desc),
 623                          EM_DBA_ALIGN);
 624         error = em_dma_malloc(adapter, rsize, &adapter->rxdma);
 625         if (error) {
 626                 device_printf(dev, "Unable to allocate rx_desc memory\n");
 627                 goto fail;
 628         }
 629         adapter->rx_desc_base = adapter->rxdma.dma_vaddr;
 630
 631         /* Allocate multicast array memory. */
 632         adapter->mta = kmalloc(ETH_ADDR_LEN * MAX_NUM_MULTICAST_ADDRESSES,
 633             M_DEVBUF, M_WAITOK);
 634
 635         /* Indicate SOL/IDER usage */
 636         if (e1000_check_reset_block(&adapter->hw)) {
 637                 device_printf(dev,
 638                     "PHY reset is blocked due to SOL/IDER session.\n");
 639         }
 640
 641         /* Disable EEE */
 642         adapter->hw.dev_spec.ich8lan.eee_disable = 1;
 643
 644         /*
 645          * Start from a known state, this is important in reading the
 646          * nvm and mac from that.
 647          */
 648         e1000_reset_hw(&adapter->hw);
 649
 650         /* Make sure we have a good EEPROM before we read from it */
 651         if (e1000_validate_nvm_checksum(&adapter->hw) < 0) {
 652                 /*
 653                  * Some PCI-E parts fail the first check due to
 654                  * the link being in sleep state, call it again,
 655                  * if it fails a second time its a real issue.
 656                  */
 657                 if (e1000_validate_nvm_checksum(&adapter->hw) < 0) {
 658                         device_printf(dev,
 659                             "The EEPROM Checksum Is Not Valid\n");
 660                         error = EIO;
 661                         goto fail;
 662                 }
 663         }
 664
 665         /* Copy the permanent MAC address out of the EEPROM */
 666         if (e1000_read_mac_addr(&adapter->hw) < 0) {
 667                 device_printf(dev, "EEPROM read error while reading MAC"
 668                     " address\n");
 669                 error = EIO;
 670                 goto fail;
 671         }
 672         if (!em_is_valid_eaddr(adapter->hw.mac.addr)) {
 673                 device_printf(dev, "Invalid MAC address\n");
 674                 error = EIO;
 675                 goto fail;
 676         }
 677
 678         /* Disable ULP support */
 679         e1000_disable_ulp_lpt_lp(&adapter->hw, TRUE);
 680
 681         /* Allocate transmit descriptors and buffers */
 682         error = em_create_tx_ring(adapter);
 683         if (error) {
 684                 device_printf(dev, "Could not setup transmit structures\n");
 685                 goto fail;
 686         }
 687
 688         /* Allocate receive descriptors and buffers */
 689         error = em_create_rx_ring(adapter);
 690         if (error) {
 691                 device_printf(dev, "Could not setup receive structures\n");
 692                 goto fail;
 693         }
 694
 695         /* Manually turn off all interrupts */
 696         E1000_WRITE_REG(&adapter->hw, E1000_IMC, 0xffffffff);
 697
 698         /* Determine if we have to control management hardware */
 699         if (e1000_enable_mng_pass_thru(&adapter->hw))
 700                 adapter->flags |= EM_FLAG_HAS_MGMT;
 701
 702         /*
 703          * Setup Wake-on-Lan
 704          */
 705         apme_mask = EM_EEPROM_APME;
 706         eeprom_data = 0;
 707         switch (adapter->hw.mac.type) {
 708         case e1000_82542:
 709         case e1000_82543:
 710                 break;
 711
 712         case e1000_82573:
 713         case e1000_82583:
 714                 adapter->flags |= EM_FLAG_HAS_AMT;
 715                 /* FALL THROUGH */
 716
 717         case e1000_82546:
 718         case e1000_82546_rev_3:
 719         case e1000_82571:
 720         case e1000_82572:
 721         case e1000_80003es2lan:
 722                 if (adapter->hw.bus.func == 1) {
 723                         e1000_read_nvm(&adapter->hw,
 724                             NVM_INIT_CONTROL3_PORT_B, 1, &eeprom_data);
 725                 } else {
 726                         e1000_read_nvm(&adapter->hw,
 727                             NVM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
 728                 }
 729                 break;
 730
 731         case e1000_ich8lan:
 732         case e1000_ich9lan:
 733         case e1000_ich10lan:
 734         case e1000_pchlan:
 735         case e1000_pch2lan:
 736                 apme_mask = E1000_WUC_APME;
 737                 adapter->flags |= EM_FLAG_HAS_AMT;
 738                 eeprom_data = E1000_READ_REG(&adapter->hw, E1000_WUC);
 739                 break;
 740
 741         default:
 742                 e1000_read_nvm(&adapter->hw,
 743                     NVM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
 744                 break;
 745         }
 746         if (eeprom_data & apme_mask)
 747                 adapter->wol = E1000_WUFC_MAG | E1000_WUFC_MC;
 748
 749         /*
 750          * We have the eeprom settings, now apply the special cases
 751          * where the eeprom may be wrong or the board won't support
 752          * wake on lan on a particular port
 753          */
 754         device_id = pci_get_device(dev);
 755         switch (device_id) {
 756         case E1000_DEV_ID_82546GB_PCIE:
 757                 adapter->wol = 0;
 758                 break;
 759
 760         case E1000_DEV_ID_82546EB_FIBER:
 761         case E1000_DEV_ID_82546GB_FIBER:
 762         case E1000_DEV_ID_82571EB_FIBER:
 763                 /*
 764                  * Wake events only supported on port A for dual fiber
 765                  * regardless of eeprom setting
 766                  */
 767                 if (E1000_READ_REG(&adapter->hw, E1000_STATUS) &
 768                     E1000_STATUS_FUNC_1)
 769                         adapter->wol = 0;
 770                 break;
 771
 772         case E1000_DEV_ID_82546GB_QUAD_COPPER_KSP3:
 773         case E1000_DEV_ID_82571EB_QUAD_COPPER:
 774         case E1000_DEV_ID_82571EB_QUAD_FIBER:
 775         case E1000_DEV_ID_82571EB_QUAD_COPPER_LP:
 776                 /* if quad port adapter, disable WoL on all but port A */
 777                 if (em_global_quad_port_a != 0)
 778                         adapter->wol = 0;
 779                 /* Reset for multiple quad port adapters */
 780                 if (++em_global_quad_port_a == 4)
 781                         em_global_quad_port_a = 0;
 782                 break;
 783         }
 784
 785         /* XXX disable wol */
 786         adapter->wol = 0;
 787
 788         /* Setup OS specific network interface */
 789         em_setup_ifp(adapter);
 790
 791         /* Add sysctl tree, must after em_setup_ifp() */
 792         em_add_sysctl(adapter);
 793
 794 #ifdef IFPOLL_ENABLE
 795         /* Polling setup */
 796         ifpoll_compat_setup(&adapter->npoll,
 797             device_get_sysctl_ctx(dev), device_get_sysctl_tree(dev),
 798             device_get_unit(dev), ifp->if_serializer);
 799 #endif
 800
 801         /* Reset the hardware */
 802         error = em_reset(adapter);
 803         if (error) {
 804                 /*
 805                  * Some 82573 parts fail the first reset, call it again,
 806                  * if it fails a second time its a real issue.
 807                  */
 808                 error = em_reset(adapter);
 809                 if (error) {
 810                         device_printf(dev, "Unable to reset the hardware\n");
 811                         ether_ifdetach(ifp);
 812                         goto fail;
 813                 }
 814         }
 815
 816         /* Initialize statistics */
 817         em_update_stats(adapter);
 818
 819         adapter->hw.mac.get_link_status = 1;
 820         em_update_link_status(adapter);
 821
 822         /* Do we need workaround for 82544 PCI-X adapter? */
 823         if (adapter->hw.bus.type == e1000_bus_type_pcix &&
 824             adapter->hw.mac.type == e1000_82544)
 825                 adapter->pcix_82544 = TRUE;
 826         else
 827                 adapter->pcix_82544 = FALSE;
 828
 829         if (adapter->pcix_82544) {
 830                 /*
 831                  * 82544 on PCI-X may split one TX segment
 832                  * into two TX descs, so we double its number
 833                  * of spare TX desc here.
 834                  */
 835                 adapter->spare_tx_desc = 2 * EM_TX_SPARE;
 836         } else {
 837                 adapter->spare_tx_desc = EM_TX_SPARE;
 838         }
 839         if (adapter->flags & EM_FLAG_TSO)
 840                 adapter->spare_tx_desc = EM_TX_SPARE_TSO;
 841         adapter->tx_wreg_nsegs = EM_DEFAULT_TXWREG;
 842
 843         /*
 844          * Keep following relationship between spare_tx_desc, oact_tx_desc
 845          * and tx_int_nsegs:
 846          * (spare_tx_desc + EM_TX_RESERVED) <=
 847          * oact_tx_desc <= EM_TX_OACTIVE_MAX <= tx_int_nsegs
 848          */
 849         adapter->oact_tx_desc = adapter->num_tx_desc / 8;
 850         if (adapter->oact_tx_desc > EM_TX_OACTIVE_MAX)
 851                 adapter->oact_tx_desc = EM_TX_OACTIVE_MAX;
 852         if (adapter->oact_tx_desc < adapter->spare_tx_desc + EM_TX_RESERVED)
 853                 adapter->oact_tx_desc = adapter->spare_tx_desc + EM_TX_RESERVED;
 854
 855         adapter->tx_int_nsegs = adapter->num_tx_desc / 16;
 856         if (adapter->tx_int_nsegs < adapter->oact_tx_desc)
 857                 adapter->tx_int_nsegs = adapter->oact_tx_desc;
 858
 859         /* Non-AMT based hardware can now take control from firmware */
 860         if ((adapter->flags & (EM_FLAG_HAS_MGMT | EM_FLAG_HAS_AMT)) ==
 861             EM_FLAG_HAS_MGMT && adapter->hw.mac.type >= e1000_82571)
 862                 em_get_hw_control(adapter);
 863
 864         ifq_set_cpuid(&ifp->if_snd, rman_get_cpuid(adapter->intr_res));
 865
 866         /*
 867          * Missing Interrupt Following ICR read:
 868          *
 869          * 82571/82572 specification update errata #76
 870          * 82573 specification update errata #31
 871          * 82574 specification update errata #12
 872          * 82583 specification update errata #4
 873          */
 874         intr_func = em_intr;
 875         if ((adapter->flags & EM_FLAG_SHARED_INTR) &&
 876             (adapter->hw.mac.type == e1000_82571 ||
 877              adapter->hw.mac.type == e1000_82572 ||
 878              adapter->hw.mac.type == e1000_82573 ||
 879              adapter->hw.mac.type == e1000_82574 ||
 880              adapter->hw.mac.type == e1000_82583))
 881                 intr_func = em_intr_mask;
 882
 883         error = bus_setup_intr(dev, adapter->intr_res, INTR_MPSAFE,
 884                                intr_func, adapter, &adapter->intr_tag,
 885                                ifp->if_serializer);
 886         if (error) {
 887                 device_printf(dev, "Failed to register interrupt handler");
 888                 ether_ifdetach(ifp);
 889                 goto fail;
 890         }
 891         return (0);
 892 fail:
 893         em_detach(dev);
 894         return (error);
 895 }
 896
 897 static int
 898 em_detach(device_t dev)
 899 {
 900         struct adapter *adapter = device_get_softc(dev);
 901
 902         if (device_is_attached(dev)) {
 903                 struct ifnet *ifp = &adapter->arpcom.ac_if;
 904
 905                 lwkt_serialize_enter(ifp->if_serializer);
 906
 907                 em_stop(adapter);
 908
 909                 e1000_phy_hw_reset(&adapter->hw);
 910
 911                 em_rel_mgmt(adapter);
 912                 em_rel_hw_control(adapter);
 913
 914                 if (adapter->wol) {
 915                         E1000_WRITE_REG(&adapter->hw, E1000_WUC,
 916                                         E1000_WUC_PME_EN);
 917                         E1000_WRITE_REG(&adapter->hw, E1000_WUFC, adapter->wol);
 918                         em_enable_wol(dev);
 919                 }
 920
 921                 bus_teardown_intr(dev, adapter->intr_res, adapter->intr_tag);
 922
 923                 lwkt_serialize_exit(ifp->if_serializer);
 924
 925                 ether_ifdetach(ifp);
 926         } else if (adapter->memory != NULL) {
 927                 em_rel_hw_control(adapter);
 928         }
 929
 930         ifmedia_removeall(&adapter->media);
 931         bus_generic_detach(dev);
 932
 933         em_free_pci_res(adapter);
 934
 935         em_destroy_tx_ring(adapter, adapter->num_tx_desc);
 936         em_destroy_rx_ring(adapter, adapter->num_rx_desc);
 937
 938         /* Free Transmit Descriptor ring */
 939         if (adapter->tx_desc_base)
 940                 em_dma_free(adapter, &adapter->txdma);
 941
 942         /* Free Receive Descriptor ring */
 943         if (adapter->rx_desc_base)
 944                 em_dma_free(adapter, &adapter->rxdma);
 945
 946         /* Free top level busdma tag */
 947         if (adapter->parent_dtag != NULL)
 948                 bus_dma_tag_destroy(adapter->parent_dtag);
 949
 950         if (adapter->mta != NULL)
 951                 kfree(adapter->mta, M_DEVBUF);
 952
 953         return (0);
 954 }
 955
 956 static int
 957 em_shutdown(device_t dev)
 958 {
 959         return em_suspend(dev);
 960 }
 961
 962 static int
 963 em_suspend(device_t dev)
 964 {
 965         struct adapter *adapter = device_get_softc(dev);
 966         struct ifnet *ifp = &adapter->arpcom.ac_if;
 967
 968         lwkt_serialize_enter(ifp->if_serializer);
 969
 970         em_stop(adapter);
 971
 972         em_rel_mgmt(adapter);
 973         em_rel_hw_control(adapter);
 974
 975         if (adapter->wol) {
 976                 E1000_WRITE_REG(&adapter->hw, E1000_WUC, E1000_WUC_PME_EN);
 977                 E1000_WRITE_REG(&adapter->hw, E1000_WUFC, adapter->wol);
 978                 em_enable_wol(dev);
 979         }
 980
 981         lwkt_serialize_exit(ifp->if_serializer);
 982
 983         return bus_generic_suspend(dev);
 984 }
 985
 986 static int
 987 em_resume(device_t dev)
 988 {
 989         struct adapter *adapter = device_get_softc(dev);
 990         struct ifnet *ifp = &adapter->arpcom.ac_if;
 991
 992         lwkt_serialize_enter(ifp->if_serializer);
 993
 994         if (adapter->hw.mac.type == e1000_pch2lan)
 995                 e1000_resume_workarounds_pchlan(&adapter->hw);
 996
 997         em_init(adapter);
 998         em_get_mgmt(adapter);
 999         if_devstart(ifp);
1000
1001         lwkt_serialize_exit(ifp->if_serializer);
1002
1003         return bus_generic_resume(dev);
1004 }
1005
1006 static void
1007 em_start(struct ifnet *ifp, struct ifaltq_subque *ifsq)
1008 {
1009         struct adapter *adapter = ifp->if_softc;
1010         struct mbuf *m_head;
1011         int idx = -1, nsegs = 0;
1012
1013         ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq);
1014         ASSERT_SERIALIZED(ifp->if_serializer);
1015
1016         if ((ifp->if_flags & IFF_RUNNING) == 0 || ifq_is_oactive(&ifp->if_snd))
1017                 return;
1018
1019         if (!adapter->link_active) {
1020                 ifq_purge(&ifp->if_snd);
1021                 return;
1022         }
1023
1024         while (!ifq_is_empty(&ifp->if_snd)) {
1025                 /* Now do we at least have a minimal? */
1026                 if (EM_IS_OACTIVE(adapter)) {
1027                         em_tx_collect(adapter);
1028                         if (EM_IS_OACTIVE(adapter)) {
1029                                 ifq_set_oactive(&ifp->if_snd);
1030                                 adapter->no_tx_desc_avail1++;
1031                                 break;
1032                         }
1033                 }
1034
1035                 logif(pkt_txqueue);
1036                 m_head = ifq_dequeue(&ifp->if_snd);
1037                 if (m_head == NULL)
1038                         break;
1039
1040                 if (em_encap(adapter, &m_head, &nsegs, &idx)) {
1041                         IFNET_STAT_INC(ifp, oerrors, 1);
1042                         em_tx_collect(adapter);
1043                         continue;
1044                 }
1045
1046                 /*
1047                  * TX interrupt are aggressively aggregated, so increasing
1048                  * opackets at TX interrupt time will make the opackets
1049                  * statistics vastly inaccurate; we do the opackets increment
1050                  * now.
1051                  */
1052                 IFNET_STAT_INC(ifp, opackets, 1);
1053
1054                 if (nsegs >= adapter->tx_wreg_nsegs && idx >= 0) {
1055                         E1000_WRITE_REG(&adapter->hw, E1000_TDT(0), idx);
1056                         nsegs = 0;
1057                         idx = -1;
1058                 }
1059
1060                 /* Send a copy of the frame to the BPF listener */
1061                 ETHER_BPF_MTAP(ifp, m_head);
1062
1063                 /* Set timeout in case hardware has problems transmitting. */
1064                 ifp->if_timer = EM_TX_TIMEOUT;
1065         }
1066         if (idx >= 0)
1067                 E1000_WRITE_REG(&adapter->hw, E1000_TDT(0), idx);
1068 }
1069
1070 static int
1071 em_ioctl(struct ifnet *ifp, u_long command, caddr_t data, struct ucred *cr)
1072 {
1073         struct adapter *adapter = ifp->if_softc;
1074         struct ifreq *ifr = (struct ifreq *)data;
1075         uint16_t eeprom_data = 0;
1076         int max_frame_size, mask, reinit;
1077         int error = 0;
1078
1079         ASSERT_SERIALIZED(ifp->if_serializer);
1080
1081         switch (command) {
1082         case SIOCSIFMTU:
1083                 switch (adapter->hw.mac.type) {
1084                 case e1000_82573:
1085                         /*
1086                          * 82573 only supports jumbo frames
1087                          * if ASPM is disabled.
1088                          */
1089                         e1000_read_nvm(&adapter->hw,
1090                             NVM_INIT_3GIO_3, 1, &eeprom_data);
1091                         if (eeprom_data & NVM_WORD1A_ASPM_MASK) {
1092                                 max_frame_size = ETHER_MAX_LEN;
1093                                 break;
1094                         }
1095                         /* FALL THROUGH */
1096
1097                 /* Limit Jumbo Frame size */
1098                 case e1000_82571:
1099                 case e1000_82572:
1100                 case e1000_ich9lan:
1101                 case e1000_ich10lan:
1102                 case e1000_pch2lan:
1103                 case e1000_pch_lpt:
1104                 case e1000_82574:
1105                 case e1000_82583:
1106                 case e1000_80003es2lan:
1107                         max_frame_size = 9234;
1108                         break;
1109
1110                 case e1000_pchlan:
1111                         max_frame_size = 4096;
1112                         break;
1113
1114                 /* Adapters that do not support jumbo frames */
1115                 case e1000_82542:
1116                 case e1000_ich8lan:
1117                         max_frame_size = ETHER_MAX_LEN;
1118                         break;
1119
1120                 default:
1121                         max_frame_size = MAX_JUMBO_FRAME_SIZE;
1122                         break;
1123                 }
1124                 if (ifr->ifr_mtu > max_frame_size - ETHER_HDR_LEN -
1125                     ETHER_CRC_LEN) {
1126                         error = EINVAL;
1127                         break;
1128                 }
1129
1130                 ifp->if_mtu = ifr->ifr_mtu;
1131                 adapter->hw.mac.max_frame_size =
1132                     ifp->if_mtu + ETHER_HDR_LEN + ETHER_CRC_LEN;
1133
1134                 if (ifp->if_flags & IFF_RUNNING)
1135                         em_init(adapter);
1136                 break;
1137
1138         case SIOCSIFFLAGS:
1139                 if (ifp->if_flags & IFF_UP) {
1140                         if ((ifp->if_flags & IFF_RUNNING)) {
1141                                 if ((ifp->if_flags ^ adapter->if_flags) &
1142                                     (IFF_PROMISC | IFF_ALLMULTI)) {
1143                                         em_disable_promisc(adapter);
1144                                         em_set_promisc(adapter);
1145                                 }
1146                         } else {
1147                                 em_init(adapter);
1148                         }
1149                 } else if (ifp->if_flags & IFF_RUNNING) {
1150                         em_stop(adapter);
1151                 }
1152                 adapter->if_flags = ifp->if_flags;
1153                 break;
1154
1155         case SIOCADDMULTI:
1156         case SIOCDELMULTI:
1157                 if (ifp->if_flags & IFF_RUNNING) {
1158                         em_disable_intr(adapter);
1159                         em_set_multi(adapter);
1160                         if (adapter->hw.mac.type == e1000_82542 &&
1161                             adapter->hw.revision_id == E1000_REVISION_2)
1162                                 em_init_rx_unit(adapter);
1163 #ifdef IFPOLL_ENABLE
1164                         if (!(ifp->if_flags & IFF_NPOLLING))
1165 #endif
1166                                 em_enable_intr(adapter);
1167                 }
1168                 break;
1169
1170         case SIOCSIFMEDIA:
1171                 /* Check SOL/IDER usage */
1172                 if (e1000_check_reset_block(&adapter->hw)) {
1173                         device_printf(adapter->dev, "Media change is"
1174                             " blocked due to SOL/IDER session.\n");
1175                         break;
1176                 }
1177                 /* FALL THROUGH */
1178
1179         case SIOCGIFMEDIA:
1180                 error = ifmedia_ioctl(ifp, ifr, &adapter->media, command);
1181                 break;
1182
1183         case SIOCSIFCAP:
1184                 reinit = 0;
1185                 mask = ifr->ifr_reqcap ^ ifp->if_capenable;
1186                 if (mask & IFCAP_RXCSUM) {
1187                         ifp->if_capenable ^= IFCAP_RXCSUM;
1188                         reinit = 1;
1189                 }
1190                 if (mask & IFCAP_TXCSUM) {
1191                         ifp->if_capenable ^= IFCAP_TXCSUM;
1192                         if (ifp->if_capenable & IFCAP_TXCSUM)
1193                                 ifp->if_hwassist |= EM_CSUM_FEATURES;
1194                         else
1195                                 ifp->if_hwassist &= ~EM_CSUM_FEATURES;
1196                 }
1197                 if (mask & IFCAP_TSO) {
1198                         ifp->if_capenable ^= IFCAP_TSO;
1199                         if (ifp->if_capenable & IFCAP_TSO)
1200                                 ifp->if_hwassist |= CSUM_TSO;
1201                         else
1202                                 ifp->if_hwassist &= ~CSUM_TSO;
1203                 }
1204                 if (mask & IFCAP_VLAN_HWTAGGING) {
1205                         ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING;
1206                         reinit = 1;
1207                 }
1208                 if (reinit && (ifp->if_flags & IFF_RUNNING))
1209                         em_init(adapter);
1210                 break;
1211
1212         default:
1213                 error = ether_ioctl(ifp, command, data);
1214                 break;
1215         }
1216         return (error);
1217 }
1218
1219 static void
1220 em_watchdog(struct ifnet *ifp)
1221 {
1222         struct adapter *adapter = ifp->if_softc;
1223
1224         ASSERT_SERIALIZED(ifp->if_serializer);
1225
1226         /*
1227          * The timer is set to 5 every time start queues a packet.
1228          * Then txeof keeps resetting it as long as it cleans at
1229          * least one descriptor.
1230          * Finally, anytime all descriptors are clean the timer is
1231          * set to 0.
1232          */
1233
1234         if (E1000_READ_REG(&adapter->hw, E1000_TDT(0)) ==
1235             E1000_READ_REG(&adapter->hw, E1000_TDH(0))) {
1236                 /*
1237                  * If we reach here, all TX jobs are completed and
1238                  * the TX engine should have been idled for some time.
1239                  * We don't need to call if_devstart() here.
1240                  */
1241                 ifq_clr_oactive(&ifp->if_snd);
1242                 ifp->if_timer = 0;
1243                 return;
1244         }
1245
1246         /*
1247          * If we are in this routine because of pause frames, then
1248          * don't reset the hardware.
1249          */
1250         if (E1000_READ_REG(&adapter->hw, E1000_STATUS) &
1251             E1000_STATUS_TXOFF) {
1252                 ifp->if_timer = EM_TX_TIMEOUT;
1253                 return;
1254         }
1255
1256         if (e1000_check_for_link(&adapter->hw) == 0)
1257                 if_printf(ifp, "watchdog timeout -- resetting\n");
1258
1259         IFNET_STAT_INC(ifp, oerrors, 1);
1260         adapter->watchdog_events++;
1261
1262         em_init(adapter);
1263
1264         if (!ifq_is_empty(&ifp->if_snd))
1265                 if_devstart(ifp);
1266 }
1267
1268 static void
1269 em_init(void *xsc)
1270 {
1271         struct adapter *adapter = xsc;
1272         struct ifnet *ifp = &adapter->arpcom.ac_if;
1273         device_t dev = adapter->dev;
1274
1275         ASSERT_SERIALIZED(ifp->if_serializer);
1276
1277         em_stop(adapter);
1278
1279         /* Get the latest mac address, User can use a LAA */
1280         bcopy(IF_LLADDR(ifp), adapter->hw.mac.addr, ETHER_ADDR_LEN);
1281
1282         /* Put the address into the Receive Address Array */
1283         e1000_rar_set(&adapter->hw, adapter->hw.mac.addr, 0);
1284
1285         /*
1286          * With the 82571 adapter, RAR[0] may be overwritten
1287          * when the other port is reset, we make a duplicate
1288          * in RAR[14] for that eventuality, this assures
1289          * the interface continues to function.
1290          */
1291         if (adapter->hw.mac.type == e1000_82571) {
1292                 e1000_set_laa_state_82571(&adapter->hw, TRUE);
1293                 e1000_rar_set(&adapter->hw, adapter->hw.mac.addr,
1294                     E1000_RAR_ENTRIES - 1);
1295         }
1296
1297         /* Reset the hardware */
1298         if (em_reset(adapter)) {
1299                 device_printf(dev, "Unable to reset the hardware\n");
1300                 /* XXX em_stop()? */
1301                 return;
1302         }
1303         em_update_link_status(adapter);
1304
1305         /* Setup VLAN support, basic and offload if available */
1306         E1000_WRITE_REG(&adapter->hw, E1000_VET, ETHERTYPE_VLAN);
1307
1308         if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) {
1309                 uint32_t ctrl;
1310
1311                 ctrl = E1000_READ_REG(&adapter->hw, E1000_CTRL);
1312                 ctrl |= E1000_CTRL_VME;
1313                 E1000_WRITE_REG(&adapter->hw, E1000_CTRL, ctrl);
1314         }
1315
1316         /* Configure for OS presence */
1317         em_get_mgmt(adapter);
1318
1319         /* Prepare transmit descriptors and buffers */
1320         em_init_tx_ring(adapter);
1321         em_init_tx_unit(adapter);
1322
1323         /* Setup Multicast table */
1324         em_set_multi(adapter);
1325
1326         /* Prepare receive descriptors and buffers */
1327         if (em_init_rx_ring(adapter)) {
1328                 device_printf(dev, "Could not setup receive structures\n");
1329                 em_stop(adapter);
1330                 return;
1331         }
1332         em_init_rx_unit(adapter);
1333
1334         /* Don't lose promiscuous settings */
1335         em_set_promisc(adapter);
1336
1337         ifp->if_flags |= IFF_RUNNING;
1338         ifq_clr_oactive(&ifp->if_snd);
1339
1340         callout_reset(&adapter->timer, hz, em_timer, adapter);
1341         e1000_clear_hw_cntrs_base_generic(&adapter->hw);
1342
1343         /* MSI/X configuration for 82574 */
1344         if (adapter->hw.mac.type == e1000_82574) {
1345                 int tmp;
1346
1347                 tmp = E1000_READ_REG(&adapter->hw, E1000_CTRL_EXT);
1348                 tmp |= E1000_CTRL_EXT_PBA_CLR;
1349                 E1000_WRITE_REG(&adapter->hw, E1000_CTRL_EXT, tmp);
1350                 /*
1351                  * XXX MSIX
1352                  * Set the IVAR - interrupt vector routing.
1353                  * Each nibble represents a vector, high bit
1354                  * is enable, other 3 bits are the MSIX table
1355                  * entry, we map RXQ0 to 0, TXQ0 to 1, and
1356                  * Link (other) to 2, hence the magic number.
1357                  */
1358                 E1000_WRITE_REG(&adapter->hw, E1000_IVAR, 0x800A0908);
1359         }
1360
1361 #ifdef IFPOLL_ENABLE
1362         /*
1363          * Only enable interrupts if we are not polling, make sure
1364          * they are off otherwise.
1365          */
1366         if (ifp->if_flags & IFF_NPOLLING)
1367                 em_disable_intr(adapter);
1368         else
1369 #endif /* IFPOLL_ENABLE */
1370                 em_enable_intr(adapter);
1371
1372         /* AMT based hardware can now take control from firmware */
1373         if ((adapter->flags & (EM_FLAG_HAS_MGMT | EM_FLAG_HAS_AMT)) ==
1374             (EM_FLAG_HAS_MGMT | EM_FLAG_HAS_AMT) &&
1375             adapter->hw.mac.type >= e1000_82571)
1376                 em_get_hw_control(adapter);
1377 }
1378
1379 #ifdef IFPOLL_ENABLE
1380
1381 static void
1382 em_npoll_compat(struct ifnet *ifp, void *arg __unused, int count)
1383 {
1384         struct adapter *adapter = ifp->if_softc;
1385
1386         ASSERT_SERIALIZED(ifp->if_serializer);
1387
1388         if (adapter->npoll.ifpc_stcount-- == 0) {
1389                 uint32_t reg_icr;
1390
1391                 adapter->npoll.ifpc_stcount = adapter->npoll.ifpc_stfrac;
1392
1393                 reg_icr = E1000_READ_REG(&adapter->hw, E1000_ICR);
1394                 if (reg_icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
1395                         callout_stop(&adapter->timer);
1396                         adapter->hw.mac.get_link_status = 1;
1397                         em_update_link_status(adapter);
1398                         callout_reset(&adapter->timer, hz, em_timer, adapter);
1399                 }
1400         }
1401
1402         em_rxeof(adapter, count);
1403         em_txeof(adapter);
1404
1405         if (!ifq_is_empty(&ifp->if_snd))
1406                 if_devstart(ifp);
1407 }
1408
1409 static void
1410 em_npoll(struct ifnet *ifp, struct ifpoll_info *info)
1411 {
1412         struct adapter *adapter = ifp->if_softc;
1413
1414         ASSERT_SERIALIZED(ifp->if_serializer);
1415
1416         if (info != NULL) {
1417                 int cpuid = adapter->npoll.ifpc_cpuid;
1418
1419                 info->ifpi_rx[cpuid].poll_func = em_npoll_compat;
1420                 info->ifpi_rx[cpuid].arg = NULL;
1421                 info->ifpi_rx[cpuid].serializer = ifp->if_serializer;
1422
1423                 if (ifp->if_flags & IFF_RUNNING)
1424                         em_disable_intr(adapter);
1425                 ifq_set_cpuid(&ifp->if_snd, cpuid);
1426         } else {
1427                 if (ifp->if_flags & IFF_RUNNING)
1428                         em_enable_intr(adapter);
1429                 ifq_set_cpuid(&ifp->if_snd, rman_get_cpuid(adapter->intr_res));
1430         }
1431 }
1432
1433 #endif /* IFPOLL_ENABLE */
1434
1435 static void
1436 em_intr(void *xsc)
1437 {
1438         em_intr_body(xsc, TRUE);
1439 }
1440
1441 static void
1442 em_intr_body(struct adapter *adapter, boolean_t chk_asserted)
1443 {
1444         struct ifnet *ifp = &adapter->arpcom.ac_if;
1445         uint32_t reg_icr;
1446
1447         logif(intr_beg);
1448         ASSERT_SERIALIZED(ifp->if_serializer);
1449
1450         reg_icr = E1000_READ_REG(&adapter->hw, E1000_ICR);
1451
1452         if (chk_asserted &&
1453             ((adapter->hw.mac.type >= e1000_82571 &&
1454               (reg_icr & E1000_ICR_INT_ASSERTED) == 0) ||
1455              reg_icr == 0)) {
1456                 logif(intr_end);
1457                 return;
1458         }
1459
1460         /*
1461          * XXX: some laptops trigger several spurious interrupts
1462          * on em(4) when in the resume cycle. The ICR register
1463          * reports all-ones value in this case. Processing such
1464          * interrupts would lead to a freeze. I don't know why.
1465          */
1466         if (reg_icr == 0xffffffff) {
1467                 logif(intr_end);
1468                 return;
1469         }
1470
1471         if (ifp->if_flags & IFF_RUNNING) {
1472                 if (reg_icr &
1473                     (E1000_ICR_RXT0 | E1000_ICR_RXDMT0 | E1000_ICR_RXO))
1474                         em_rxeof(adapter, -1);
1475                 if (reg_icr & E1000_ICR_TXDW) {
1476                         em_txeof(adapter);
1477                         if (!ifq_is_empty(&ifp->if_snd))
1478                                 if_devstart(ifp);
1479                 }
1480         }
1481
1482         /* Link status change */
1483         if (reg_icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
1484                 callout_stop(&adapter->timer);
1485                 adapter->hw.mac.get_link_status = 1;
1486                 em_update_link_status(adapter);
1487
1488                 /* Deal with TX cruft when link lost */
1489                 em_tx_purge(adapter);
1490
1491                 callout_reset(&adapter->timer, hz, em_timer, adapter);
1492         }
1493
1494         if (reg_icr & E1000_ICR_RXO)
1495                 adapter->rx_overruns++;
1496
1497         logif(intr_end);
1498 }
1499
1500 static void
1501 em_intr_mask(void *xsc)
1502 {
1503         struct adapter *adapter = xsc;
1504
1505         E1000_WRITE_REG(&adapter->hw, E1000_IMC, 0xffffffff);
1506         /*
1507          * NOTE:
1508          * ICR.INT_ASSERTED bit will never be set if IMS is 0,
1509          * so don't check it.
1510          */
1511         em_intr_body(adapter, FALSE);
1512         E1000_WRITE_REG(&adapter->hw, E1000_IMS, IMS_ENABLE_MASK);
1513 }
1514
1515 static void
1516 em_media_status(struct ifnet *ifp, struct ifmediareq *ifmr)
1517 {
1518         struct adapter *adapter = ifp->if_softc;
1519         u_char fiber_type = IFM_1000_SX;
1520
1521         ASSERT_SERIALIZED(ifp->if_serializer);
1522
1523         em_update_link_status(adapter);
1524
1525         ifmr->ifm_status = IFM_AVALID;
1526         ifmr->ifm_active = IFM_ETHER;
1527
1528         if (!adapter->link_active)
1529                 return;
1530
1531         ifmr->ifm_status |= IFM_ACTIVE;
1532
1533         if (adapter->hw.phy.media_type == e1000_media_type_fiber ||
1534             adapter->hw.phy.media_type == e1000_media_type_internal_serdes) {
1535                 if (adapter->hw.mac.type == e1000_82545)
1536                         fiber_type = IFM_1000_LX;
1537                 ifmr->ifm_active |= fiber_type | IFM_FDX;
1538         } else {
1539                 switch (adapter->link_speed) {
1540                 case 10:
1541                         ifmr->ifm_active |= IFM_10_T;
1542                         break;
1543                 case 100:
1544                         ifmr->ifm_active |= IFM_100_TX;
1545                         break;
1546
1547                 case 1000:
1548                         ifmr->ifm_active |= IFM_1000_T;
1549                         break;
1550                 }
1551                 if (adapter->link_duplex == FULL_DUPLEX)
1552                         ifmr->ifm_active |= IFM_FDX;
1553                 else
1554                         ifmr->ifm_active |= IFM_HDX;
1555         }
1556 }
1557
1558 static int
1559 em_media_change(struct ifnet *ifp)
1560 {
1561         struct adapter *adapter = ifp->if_softc;
1562         struct ifmedia *ifm = &adapter->media;
1563
1564         ASSERT_SERIALIZED(ifp->if_serializer);
1565
1566         if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
1567                 return (EINVAL);
1568
1569         switch (IFM_SUBTYPE(ifm->ifm_media)) {
1570         case IFM_AUTO:
1571                 adapter->hw.mac.autoneg = DO_AUTO_NEG;
1572                 adapter->hw.phy.autoneg_advertised = AUTONEG_ADV_DEFAULT;
1573                 break;
1574
1575         case IFM_1000_LX:
1576         case IFM_1000_SX:
1577         case IFM_1000_T:
1578                 adapter->hw.mac.autoneg = DO_AUTO_NEG;
1579                 adapter->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL;
1580                 break;
1581
1582         case IFM_100_TX:
1583                 adapter->hw.mac.autoneg = FALSE;
1584                 adapter->hw.phy.autoneg_advertised = 0;
1585                 if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX)
1586                         adapter->hw.mac.forced_speed_duplex = ADVERTISE_100_FULL;
1587                 else
1588                         adapter->hw.mac.forced_speed_duplex = ADVERTISE_100_HALF;
1589                 break;
1590
1591         case IFM_10_T:
1592                 adapter->hw.mac.autoneg = FALSE;
1593                 adapter->hw.phy.autoneg_advertised = 0;
1594                 if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX)
1595                         adapter->hw.mac.forced_speed_duplex = ADVERTISE_10_FULL;
1596                 else
1597                         adapter->hw.mac.forced_speed_duplex = ADVERTISE_10_HALF;
1598                 break;
1599
1600         default:
1601                 if_printf(ifp, "Unsupported media type\n");
1602                 break;
1603         }
1604
1605         em_init(adapter);
1606
1607         return (0);
1608 }
1609
1610 static int
1611 em_encap(struct adapter *adapter, struct mbuf **m_headp,
1612     int *segs_used, int *idx)
1613 {
1614         bus_dma_segment_t segs[EM_MAX_SCATTER];
1615         bus_dmamap_t map;
1616         struct em_buffer *tx_buffer, *tx_buffer_mapped;
1617         struct e1000_tx_desc *ctxd = NULL;
1618         struct mbuf *m_head = *m_headp;
1619         uint32_t txd_upper, txd_lower, txd_used, cmd = 0;
1620         int maxsegs, nsegs, i, j, first, last = 0, error;
1621
1622         if (m_head->m_pkthdr.csum_flags & CSUM_TSO) {
1623                 error = em_tso_pullup(adapter, m_headp);
1624                 if (error)
1625                         return error;
1626                 m_head = *m_headp;
1627         }
1628
1629         txd_upper = txd_lower = 0;
1630         txd_used = 0;
1631
1632         /*
1633          * Capture the first descriptor index, this descriptor
1634          * will have the index of the EOP which is the only one
1635          * that now gets a DONE bit writeback.
1636          */
1637         first = adapter->next_avail_tx_desc;
1638         tx_buffer = &adapter->tx_buffer_area[first];
1639         tx_buffer_mapped = tx_buffer;
1640         map = tx_buffer->map;
1641
1642         maxsegs = adapter->num_tx_desc_avail - EM_TX_RESERVED;
1643         KASSERT(maxsegs >= adapter->spare_tx_desc,
1644                 ("not enough spare TX desc"));
1645         if (adapter->pcix_82544) {
1646                 /* Half it; see the comment in em_attach() */
1647                 maxsegs >>= 1;
1648         }
1649         if (maxsegs > EM_MAX_SCATTER)
1650                 maxsegs = EM_MAX_SCATTER;
1651
1652         error = bus_dmamap_load_mbuf_defrag(adapter->txtag, map, m_headp,
1653                         segs, maxsegs, &nsegs, BUS_DMA_NOWAIT);
1654         if (error) {
1655                 if (error == ENOBUFS)
1656                         adapter->mbuf_alloc_failed++;
1657                 else
1658                         adapter->no_tx_dma_setup++;
1659
1660                 m_freem(*m_headp);
1661                 *m_headp = NULL;
1662                 return error;
1663         }
1664         bus_dmamap_sync(adapter->txtag, map, BUS_DMASYNC_PREWRITE);
1665
1666         m_head = *m_headp;
1667         adapter->tx_nsegs += nsegs;
1668         *segs_used += nsegs;
1669
1670         if (m_head->m_pkthdr.csum_flags & CSUM_TSO) {
1671                 /* TSO will consume one TX desc */
1672                 i = em_tso_setup(adapter, m_head, &txd_upper, &txd_lower);
1673                 adapter->tx_nsegs += i;
1674                 *segs_used += i;
1675         } else if (m_head->m_pkthdr.csum_flags & EM_CSUM_FEATURES) {
1676                 /* TX csum offloading will consume one TX desc */
1677                 i = em_txcsum(adapter, m_head, &txd_upper, &txd_lower);
1678                 adapter->tx_nsegs += i;
1679                 *segs_used += i;
1680         }
1681
1682         /* Handle VLAN tag */
1683         if (m_head->m_flags & M_VLANTAG) {
1684                 /* Set the vlan id. */
1685                 txd_upper |= (htole16(m_head->m_pkthdr.ether_vlantag) << 16);
1686                 /* Tell hardware to add tag */
1687                 txd_lower |= htole32(E1000_TXD_CMD_VLE);
1688         }
1689
1690         i = adapter->next_avail_tx_desc;
1691
1692         /* Set up our transmit descriptors */
1693         for (j = 0; j < nsegs; j++) {
1694                 /* If adapter is 82544 and on PCIX bus */
1695                 if(adapter->pcix_82544) {
1696                         DESC_ARRAY desc_array;
1697                         uint32_t array_elements, counter;
1698
1699                         /*
1700                          * Check the Address and Length combination and
1701                          * split the data accordingly
1702                          */
1703                         array_elements = em_82544_fill_desc(segs[j].ds_addr,
1704                                                 segs[j].ds_len, &desc_array);
1705                         for (counter = 0; counter < array_elements; counter++) {
1706                                 KKASSERT(txd_used < adapter->num_tx_desc_avail);
1707
1708                                 tx_buffer = &adapter->tx_buffer_area[i];
1709                                 ctxd = &adapter->tx_desc_base[i];
1710
1711                                 ctxd->buffer_addr = htole64(
1712                                     desc_array.descriptor[counter].address);
1713                                 ctxd->lower.data = htole32(
1714                                     E1000_TXD_CMD_IFCS | txd_lower |
1715                                     desc_array.descriptor[counter].length);
1716                                 ctxd->upper.data = htole32(txd_upper);
1717
1718                                 last = i;
1719                                 if (++i == adapter->num_tx_desc)
1720                                         i = 0;
1721
1722                                 txd_used++;
1723                         }
1724                 } else {
1725                         tx_buffer = &adapter->tx_buffer_area[i];
1726                         ctxd = &adapter->tx_desc_base[i];
1727
1728                         ctxd->buffer_addr = htole64(segs[j].ds_addr);
1729                         ctxd->lower.data = htole32(E1000_TXD_CMD_IFCS |
1730                                                    txd_lower | segs[j].ds_len);
1731                         ctxd->upper.data = htole32(txd_upper);
1732
1733                         last = i;
1734                         if (++i == adapter->num_tx_desc)
1735                                 i = 0;
1736                 }
1737         }
1738
1739         adapter->next_avail_tx_desc = i;
1740         if (adapter->pcix_82544) {
1741                 KKASSERT(adapter->num_tx_desc_avail > txd_used);
1742                 adapter->num_tx_desc_avail -= txd_used;
1743         } else {
1744                 KKASSERT(adapter->num_tx_desc_avail > nsegs);
1745                 adapter->num_tx_desc_avail -= nsegs;
1746         }
1747
1748         tx_buffer->m_head = m_head;
1749         tx_buffer_mapped->map = tx_buffer->map;
1750         tx_buffer->map = map;
1751
1752         if (adapter->tx_nsegs >= adapter->tx_int_nsegs) {
1753                 adapter->tx_nsegs = 0;
1754
1755                 /*
1756                  * Report Status (RS) is turned on
1757                  * every tx_int_nsegs descriptors.
1758                  */
1759                 cmd = E1000_TXD_CMD_RS;
1760
1761                 /*
1762                  * Keep track of the descriptor, which will
1763                  * be written back by hardware.
1764                  */
1765                 adapter->tx_dd[adapter->tx_dd_tail] = last;
1766                 EM_INC_TXDD_IDX(adapter->tx_dd_tail);
1767                 KKASSERT(adapter->tx_dd_tail != adapter->tx_dd_head);
1768         }
1769
1770         /*
1771          * Last Descriptor of Packet needs End Of Packet (EOP)
1772          */
1773         ctxd->lower.data |= htole32(E1000_TXD_CMD_EOP | cmd);
1774
1775         if (adapter->hw.mac.type == e1000_82547) {
1776                 /*
1777                  * Advance the Transmit Descriptor Tail (TDT), this tells the
1778                  * E1000 that this frame is available to transmit.
1779                  */
1780                 if (adapter->link_duplex == HALF_DUPLEX) {
1781                         em_82547_move_tail_serialized(adapter);
1782                 } else {
1783                         E1000_WRITE_REG(&adapter->hw, E1000_TDT(0), i);
1784                         em_82547_update_fifo_head(adapter,
1785                             m_head->m_pkthdr.len);
1786                 }
1787         } else {
1788                 /*
1789                  * Defer TDT updating, until enough descriptors are setup
1790                  */
1791                 *idx = i;
1792         }
1793         return (0);
1794 }
1795
1796 /*
1797  * 82547 workaround to avoid controller hang in half-duplex environment.
1798  * The workaround is to avoid queuing a large packet that would span
1799  * the internal Tx FIFO ring boundary.  We need to reset the FIFO pointers
1800  * in this case.  We do that only when FIFO is quiescent.
1801  */
1802 static void
1803 em_82547_move_tail_serialized(struct adapter *adapter)
1804 {
1805         struct e1000_tx_desc *tx_desc;
1806         uint16_t hw_tdt, sw_tdt, length = 0;
1807         bool eop = 0;
1808
1809         ASSERT_SERIALIZED(adapter->arpcom.ac_if.if_serializer);
1810
1811         hw_tdt = E1000_READ_REG(&adapter->hw, E1000_TDT(0));
1812         sw_tdt = adapter->next_avail_tx_desc;
1813
1814         while (hw_tdt != sw_tdt) {
1815                 tx_desc = &adapter->tx_desc_base[hw_tdt];
1816                 length += tx_desc->lower.flags.length;
1817                 eop = tx_desc->lower.data & E1000_TXD_CMD_EOP;
1818                 if (++hw_tdt == adapter->num_tx_desc)
1819                         hw_tdt = 0;
1820
1821                 if (eop) {
1822                         if (em_82547_fifo_workaround(adapter, length)) {
1823                                 adapter->tx_fifo_wrk_cnt++;
1824                                 callout_reset(&adapter->tx_fifo_timer, 1,
1825                                         em_82547_move_tail, adapter);
1826                                 break;
1827                         }
1828                         E1000_WRITE_REG(&adapter->hw, E1000_TDT(0), hw_tdt);
1829                         em_82547_update_fifo_head(adapter, length);
1830                         length = 0;
1831                 }
1832         }
1833 }
1834
1835 static void
1836 em_82547_move_tail(void *xsc)
1837 {
1838         struct adapter *adapter = xsc;
1839         struct ifnet *ifp = &adapter->arpcom.ac_if;
1840
1841         lwkt_serialize_enter(ifp->if_serializer);
1842         em_82547_move_tail_serialized(adapter);
1843         lwkt_serialize_exit(ifp->if_serializer);
1844 }
1845
1846 static int
1847 em_82547_fifo_workaround(struct adapter *adapter, int len)
1848 {
1849         int fifo_space, fifo_pkt_len;
1850
1851         fifo_pkt_len = roundup2(len + EM_FIFO_HDR, EM_FIFO_HDR);
1852
1853         if (adapter->link_duplex == HALF_DUPLEX) {
1854                 fifo_space = adapter->tx_fifo_size - adapter->tx_fifo_head;
1855
1856                 if (fifo_pkt_len >= (EM_82547_PKT_THRESH + fifo_space)) {
1857                         if (em_82547_tx_fifo_reset(adapter))
1858                                 return (0);
1859                         else
1860                                 return (1);
1861                 }
1862         }
1863         return (0);
1864 }
1865
1866 static void
1867 em_82547_update_fifo_head(struct adapter *adapter, int len)
1868 {
1869         int fifo_pkt_len = roundup2(len + EM_FIFO_HDR, EM_FIFO_HDR);
1870
1871         /* tx_fifo_head is always 16 byte aligned */
1872         adapter->tx_fifo_head += fifo_pkt_len;
1873         if (adapter->tx_fifo_head >= adapter->tx_fifo_size)
1874                 adapter->tx_fifo_head -= adapter->tx_fifo_size;
1875 }
1876
1877 static int
1878 em_82547_tx_fifo_reset(struct adapter *adapter)
1879 {
1880         uint32_t tctl;
1881
1882         if ((E1000_READ_REG(&adapter->hw, E1000_TDT(0)) ==
1883              E1000_READ_REG(&adapter->hw, E1000_TDH(0))) &&
1884             (E1000_READ_REG(&adapter->hw, E1000_TDFT) ==
1885              E1000_READ_REG(&adapter->hw, E1000_TDFH)) &&
1886             (E1000_READ_REG(&adapter->hw, E1000_TDFTS) ==
1887              E1000_READ_REG(&adapter->hw, E1000_TDFHS)) &&
1888             (E1000_READ_REG(&adapter->hw, E1000_TDFPC) == 0)) {
1889                 /* Disable TX unit */
1890                 tctl = E1000_READ_REG(&adapter->hw, E1000_TCTL);
1891                 E1000_WRITE_REG(&adapter->hw, E1000_TCTL,
1892                     tctl & ~E1000_TCTL_EN);
1893
1894                 /* Reset FIFO pointers */
1895                 E1000_WRITE_REG(&adapter->hw, E1000_TDFT,
1896                     adapter->tx_head_addr);
1897                 E1000_WRITE_REG(&adapter->hw, E1000_TDFH,
1898                     adapter->tx_head_addr);
1899                 E1000_WRITE_REG(&adapter->hw, E1000_TDFTS,
1900                     adapter->tx_head_addr);
1901                 E1000_WRITE_REG(&adapter->hw, E1000_TDFHS,
1902                     adapter->tx_head_addr);
1903
1904                 /* Re-enable TX unit */
1905                 E1000_WRITE_REG(&adapter->hw, E1000_TCTL, tctl);
1906                 E1000_WRITE_FLUSH(&adapter->hw);
1907
1908                 adapter->tx_fifo_head = 0;
1909                 adapter->tx_fifo_reset_cnt++;
1910
1911                 return (TRUE);
1912         } else {
1913                 return (FALSE);
1914         }
1915 }
1916
1917 static void
1918 em_set_promisc(struct adapter *adapter)
1919 {
1920         struct ifnet *ifp = &adapter->arpcom.ac_if;
1921         uint32_t reg_rctl;
1922
1923         reg_rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);
1924
1925         if (ifp->if_flags & IFF_PROMISC) {
1926                 reg_rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
1927                 /* Turn this on if you want to see bad packets */
1928                 if (em_debug_sbp)
1929                         reg_rctl |= E1000_RCTL_SBP;
1930                 E1000_WRITE_REG(&adapter->hw, E1000_RCTL, reg_rctl);
1931         } else if (ifp->if_flags & IFF_ALLMULTI) {
1932                 reg_rctl |= E1000_RCTL_MPE;
1933                 reg_rctl &= ~E1000_RCTL_UPE;
1934                 E1000_WRITE_REG(&adapter->hw, E1000_RCTL, reg_rctl);
1935         }
1936 }
1937
1938 static void
1939 em_disable_promisc(struct adapter *adapter)
1940 {
1941         uint32_t reg_rctl;
1942
1943         reg_rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);
1944
1945         reg_rctl &= ~E1000_RCTL_UPE;
1946         reg_rctl &= ~E1000_RCTL_MPE;
1947         reg_rctl &= ~E1000_RCTL_SBP;
1948         E1000_WRITE_REG(&adapter->hw, E1000_RCTL, reg_rctl);
1949 }
1950
1951 static void
1952 em_set_multi(struct adapter *adapter)
1953 {
1954         struct ifnet *ifp = &adapter->arpcom.ac_if;
1955         struct ifmultiaddr *ifma;
1956         uint32_t reg_rctl = 0;
1957         uint8_t *mta;
1958         int mcnt = 0;
1959
1960         mta = adapter->mta;
1961         bzero(mta, ETH_ADDR_LEN * MAX_NUM_MULTICAST_ADDRESSES);
1962
1963         if (adapter->hw.mac.type == e1000_82542 &&
1964             adapter->hw.revision_id == E1000_REVISION_2) {
1965                 reg_rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);
1966                 if (adapter->hw.bus.pci_cmd_word & CMD_MEM_WRT_INVALIDATE)
1967                         e1000_pci_clear_mwi(&adapter->hw);
1968                 reg_rctl |= E1000_RCTL_RST;
1969                 E1000_WRITE_REG(&adapter->hw, E1000_RCTL, reg_rctl);
1970                 msec_delay(5);
1971         }
1972
1973         TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1974                 if (ifma->ifma_addr->sa_family != AF_LINK)
1975                         continue;
1976
1977                 if (mcnt == MAX_NUM_MULTICAST_ADDRESSES)
1978                         break;
1979
1980                 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
1981                     &mta[mcnt * ETHER_ADDR_LEN], ETHER_ADDR_LEN);
1982                 mcnt++;
1983         }
1984
1985         if (mcnt >= MAX_NUM_MULTICAST_ADDRESSES) {
1986                 reg_rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);
1987                 reg_rctl |= E1000_RCTL_MPE;
1988                 E1000_WRITE_REG(&adapter->hw, E1000_RCTL, reg_rctl);
1989         } else {
1990                 e1000_update_mc_addr_list(&adapter->hw, mta, mcnt);
1991         }
1992
1993         if (adapter->hw.mac.type == e1000_82542 &&
1994             adapter->hw.revision_id == E1000_REVISION_2) {
1995                 reg_rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);
1996                 reg_rctl &= ~E1000_RCTL_RST;
1997                 E1000_WRITE_REG(&adapter->hw, E1000_RCTL, reg_rctl);
1998                 msec_delay(5);
1999                 if (adapter->hw.bus.pci_cmd_word & CMD_MEM_WRT_INVALIDATE)
2000                         e1000_pci_set_mwi(&adapter->hw);
2001         }
2002 }
2003
2004 /*
2005  * This routine checks for link status and updates statistics.
2006  */
2007 static void
2008 em_timer(void *xsc)
2009 {
2010         struct adapter *adapter = xsc;
2011         struct ifnet *ifp = &adapter->arpcom.ac_if;
2012
2013         lwkt_serialize_enter(ifp->if_serializer);
2014
2015         em_update_link_status(adapter);
2016         em_update_stats(adapter);
2017
2018         /* Reset LAA into RAR[0] on 82571 */
2019         if (e1000_get_laa_state_82571(&adapter->hw) == TRUE)
2020                 e1000_rar_set(&adapter->hw, adapter->hw.mac.addr, 0);
2021
2022         if (em_display_debug_stats && (ifp->if_flags & IFF_RUNNING))
2023                 em_print_hw_stats(adapter);
2024
2025         em_smartspeed(adapter);
2026
2027         callout_reset(&adapter->timer, hz, em_timer, adapter);
2028
2029         lwkt_serialize_exit(ifp->if_serializer);
2030 }
2031
2032 static void
2033 em_update_link_status(struct adapter *adapter)
2034 {
2035         struct e1000_hw *hw = &adapter->hw;
2036         struct ifnet *ifp = &adapter->arpcom.ac_if;
2037         device_t dev = adapter->dev;
2038         uint32_t link_check = 0;
2039
2040         /* Get the cached link value or read phy for real */
2041         switch (hw->phy.media_type) {
2042         case e1000_media_type_copper:
2043                 if (hw->mac.get_link_status) {
2044                         /* Do the work to read phy */
2045                         e1000_check_for_link(hw);
2046                         link_check = !hw->mac.get_link_status;
2047                         if (link_check) /* ESB2 fix */
2048                                 e1000_cfg_on_link_up(hw);
2049                 } else {
2050                         link_check = TRUE;
2051                 }
2052                 break;
2053
2054         case e1000_media_type_fiber:
2055                 e1000_check_for_link(hw);
2056                 link_check =
2057                         E1000_READ_REG(hw, E1000_STATUS) & E1000_STATUS_LU;
2058                 break;
2059
2060         case e1000_media_type_internal_serdes:
2061                 e1000_check_for_link(hw);
2062                 link_check = adapter->hw.mac.serdes_has_link;
2063                 break;
2064
2065         case e1000_media_type_unknown:
2066         default:
2067                 break;
2068         }
2069
2070         /* Now check for a transition */
2071         if (link_check && adapter->link_active == 0) {
2072                 e1000_get_speed_and_duplex(hw, &adapter->link_speed,
2073                     &adapter->link_duplex);
2074
2075                 /*
2076                  * Check if we should enable/disable SPEED_MODE bit on
2077                  * 82571/82572
2078                  */
2079                 if (adapter->link_speed != SPEED_1000 &&
2080                     (hw->mac.type == e1000_82571 ||
2081                      hw->mac.type == e1000_82572)) {
2082                         int tarc0;
2083
2084                         tarc0 = E1000_READ_REG(hw, E1000_TARC(0));
2085                         tarc0 &= ~SPEED_MODE_BIT;
2086                         E1000_WRITE_REG(hw, E1000_TARC(0), tarc0);
2087                 }
2088                 if (bootverbose) {
2089                         device_printf(dev, "Link is up %d Mbps %s\n",
2090                             adapter->link_speed,
2091                             ((adapter->link_duplex == FULL_DUPLEX) ?
2092                             "Full Duplex" : "Half Duplex"));
2093                 }
2094                 adapter->link_active = 1;
2095                 adapter->smartspeed = 0;
2096                 ifp->if_baudrate = adapter->link_speed * 1000000;
2097                 ifp->if_link_state = LINK_STATE_UP;
2098                 if_link_state_change(ifp);
2099         } else if (!link_check && adapter->link_active == 1) {
2100                 ifp->if_baudrate = adapter->link_speed = 0;
2101                 adapter->link_duplex = 0;
2102                 if (bootverbose)
2103                         device_printf(dev, "Link is Down\n");
2104                 adapter->link_active = 0;
2105 #if 0
2106                 /* Link down, disable watchdog */
2107                 if->if_timer = 0;
2108 #endif
2109                 ifp->if_link_state = LINK_STATE_DOWN;
2110                 if_link_state_change(ifp);
2111         }
2112 }
2113
2114 static void
2115 em_stop(struct adapter *adapter)
2116 {
2117         struct ifnet *ifp = &adapter->arpcom.ac_if;
2118         int i;
2119
2120         ASSERT_SERIALIZED(ifp->if_serializer);
2121
2122         em_disable_intr(adapter);
2123
2124         callout_stop(&adapter->timer);
2125         callout_stop(&adapter->tx_fifo_timer);
2126
2127         ifp->if_flags &= ~IFF_RUNNING;
2128         ifq_clr_oactive(&ifp->if_snd);
2129         ifp->if_timer = 0;
2130
2131         e1000_reset_hw(&adapter->hw);
2132         if (adapter->hw.mac.type >= e1000_82544)
2133                 E1000_WRITE_REG(&adapter->hw, E1000_WUC, 0);
2134
2135         for (i = 0; i < adapter->num_tx_desc; i++) {
2136                 struct em_buffer *tx_buffer = &adapter->tx_buffer_area[i];
2137
2138                 if (tx_buffer->m_head != NULL) {
2139                         bus_dmamap_unload(adapter->txtag, tx_buffer->map);
2140                         m_freem(tx_buffer->m_head);
2141                         tx_buffer->m_head = NULL;
2142                 }
2143         }
2144
2145         for (i = 0; i < adapter->num_rx_desc; i++) {
2146                 struct em_buffer *rx_buffer = &adapter->rx_buffer_area[i];
2147
2148                 if (rx_buffer->m_head != NULL) {
2149                         bus_dmamap_unload(adapter->rxtag, rx_buffer->map);
2150                         m_freem(rx_buffer->m_head);
2151                         rx_buffer->m_head = NULL;
2152                 }
2153         }
2154
2155         if (adapter->fmp != NULL)
2156                 m_freem(adapter->fmp);
2157         adapter->fmp = NULL;
2158         adapter->lmp = NULL;
2159
2160         adapter->csum_flags = 0;
2161         adapter->csum_lhlen = 0;
2162         adapter->csum_iphlen = 0;
2163         adapter->csum_thlen = 0;
2164         adapter->csum_mss = 0;
2165         adapter->csum_pktlen = 0;
2166
2167         adapter->tx_dd_head = 0;
2168         adapter->tx_dd_tail = 0;
2169         adapter->tx_nsegs = 0;
2170 }
2171
2172 static int
2173 em_get_hw_info(struct adapter *adapter)
2174 {
2175         device_t dev = adapter->dev;
2176
2177         /* Save off the information about this board */
2178         adapter->hw.vendor_id = pci_get_vendor(dev);
2179         adapter->hw.device_id = pci_get_device(dev);
2180         adapter->hw.revision_id = pci_get_revid(dev);
2181         adapter->hw.subsystem_vendor_id = pci_get_subvendor(dev);
2182         adapter->hw.subsystem_device_id = pci_get_subdevice(dev);
2183
2184         /* Do Shared Code Init and Setup */
2185         if (e1000_set_mac_type(&adapter->hw))
2186                 return ENXIO;
2187         return 0;
2188 }
2189
2190 static int
2191 em_alloc_pci_res(struct adapter *adapter)
2192 {
2193         device_t dev = adapter->dev;
2194         u_int intr_flags;
2195         int val, rid, msi_enable;
2196
2197         /* Enable bus mastering */
2198         pci_enable_busmaster(dev);
2199
2200         adapter->memory_rid = EM_BAR_MEM;
2201         adapter->memory = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
2202                                 &adapter->memory_rid, RF_ACTIVE);
2203         if (adapter->memory == NULL) {
2204                 device_printf(dev, "Unable to allocate bus resource: memory\n");
2205                 return (ENXIO);
2206         }
2207         adapter->osdep.mem_bus_space_tag =
2208             rman_get_bustag(adapter->memory);
2209         adapter->osdep.mem_bus_space_handle =
2210             rman_get_bushandle(adapter->memory);
2211
2212         /* XXX This is quite goofy, it is not actually used */
2213         adapter->hw.hw_addr = (uint8_t *)&adapter->osdep.mem_bus_space_handle;
2214
2215         /* Only older adapters use IO mapping */
2216         if (adapter->hw.mac.type > e1000_82543 &&
2217             adapter->hw.mac.type < e1000_82571) {
2218                 /* Figure our where our IO BAR is ? */
2219                 for (rid = PCIR_BAR(0); rid < PCIR_CARDBUSCIS;) {
2220                         val = pci_read_config(dev, rid, 4);
2221                         if (EM_BAR_TYPE(val) == EM_BAR_TYPE_IO) {
2222                                 adapter->io_rid = rid;
2223                                 break;
2224                         }
2225                         rid += 4;
2226                         /* check for 64bit BAR */
2227                         if (EM_BAR_MEM_TYPE(val) == EM_BAR_MEM_TYPE_64BIT)
2228                                 rid += 4;
2229                 }
2230                 if (rid >= PCIR_CARDBUSCIS) {
2231                         device_printf(dev, "Unable to locate IO BAR\n");
2232                         return (ENXIO);
2233                 }
2234                 adapter->ioport = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
2235                                         &adapter->io_rid, RF_ACTIVE);
2236                 if (adapter->ioport == NULL) {
2237                         device_printf(dev, "Unable to allocate bus resource: "
2238                             "ioport\n");
2239                         return (ENXIO);
2240                 }
2241                 adapter->hw.io_base = 0;
2242                 adapter->osdep.io_bus_space_tag =
2243                     rman_get_bustag(adapter->ioport);
2244                 adapter->osdep.io_bus_space_handle =
2245                     rman_get_bushandle(adapter->ioport);
2246         }
2247
2248         /*
2249          * Don't enable MSI-X on 82574, see:
2250          * 82574 specification update errata #15
2251          *
2252          * Don't enable MSI on PCI/PCI-X chips, see:
2253          * 82540 specification update errata #6
2254          * 82545 specification update errata #4
2255          *
2256          * Don't enable MSI on 82571/82572, see:
2257          * 82571/82572 specification update errata #63
2258          */
2259         msi_enable = em_msi_enable;
2260         if (msi_enable &&
2261             (!pci_is_pcie(dev) ||
2262              adapter->hw.mac.type == e1000_82571 ||
2263              adapter->hw.mac.type == e1000_82572))
2264                 msi_enable = 0;
2265
2266         adapter->intr_type = pci_alloc_1intr(dev, msi_enable,
2267             &adapter->intr_rid, &intr_flags);
2268
2269         if (adapter->intr_type == PCI_INTR_TYPE_LEGACY) {
2270                 int unshared;
2271
2272                 unshared = device_getenv_int(dev, "irq.unshared", 0);
2273                 if (!unshared) {
2274                         adapter->flags |= EM_FLAG_SHARED_INTR;
2275                         if (bootverbose)
2276                                 device_printf(dev, "IRQ shared\n");
2277                 } else {
2278                         intr_flags &= ~RF_SHAREABLE;
2279                         if (bootverbose)
2280                                 device_printf(dev, "IRQ unshared\n");
2281                 }
2282         }
2283
2284         adapter->intr_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
2285             &adapter->intr_rid, intr_flags);
2286         if (adapter->intr_res == NULL) {
2287                 device_printf(dev, "Unable to allocate bus resource: "
2288                     "interrupt\n");
2289                 return (ENXIO);
2290         }
2291
2292         adapter->hw.bus.pci_cmd_word = pci_read_config(dev, PCIR_COMMAND, 2);
2293         adapter->hw.back = &adapter->osdep;
2294         return (0);
2295 }
2296
2297 static void
2298 em_free_pci_res(struct adapter *adapter)
2299 {
2300         device_t dev = adapter->dev;
2301
2302         if (adapter->intr_res != NULL) {
2303                 bus_release_resource(dev, SYS_RES_IRQ,
2304                     adapter->intr_rid, adapter->intr_res);
2305         }
2306
2307         if (adapter->intr_type == PCI_INTR_TYPE_MSI)
2308                 pci_release_msi(dev);
2309
2310         if (adapter->memory != NULL) {
2311                 bus_release_resource(dev, SYS_RES_MEMORY,
2312                     adapter->memory_rid, adapter->memory);
2313         }
2314
2315         if (adapter->flash != NULL) {
2316                 bus_release_resource(dev, SYS_RES_MEMORY,
2317                     adapter->flash_rid, adapter->flash);
2318         }
2319
2320         if (adapter->ioport != NULL) {
2321                 bus_release_resource(dev, SYS_RES_IOPORT,
2322                     adapter->io_rid, adapter->ioport);
2323         }
2324 }
2325
2326 static int
2327 em_reset(struct adapter *adapter)
2328 {
2329         device_t dev = adapter->dev;
2330         uint16_t rx_buffer_size;
2331         uint32_t pba;
2332
2333         /* When hardware is reset, fifo_head is also reset */
2334         adapter->tx_fifo_head = 0;
2335
2336         /* Set up smart power down as default off on newer adapters. */
2337         if (!em_smart_pwr_down &&
2338             (adapter->hw.mac.type == e1000_82571 ||
2339              adapter->hw.mac.type == e1000_82572)) {
2340                 uint16_t phy_tmp = 0;
2341
2342                 /* Speed up time to link by disabling smart power down. */
2343                 e1000_read_phy_reg(&adapter->hw,
2344                     IGP02E1000_PHY_POWER_MGMT, &phy_tmp);
2345                 phy_tmp &= ~IGP02E1000_PM_SPD;
2346                 e1000_write_phy_reg(&adapter->hw,
2347                     IGP02E1000_PHY_POWER_MGMT, phy_tmp);
2348         }
2349
2350         /*
2351          * Packet Buffer Allocation (PBA)
2352          * Writing PBA sets the receive portion of the buffer
2353          * the remainder is used for the transmit buffer.
2354          *
2355          * Devices before the 82547 had a Packet Buffer of 64K.
2356          *   Default allocation: PBA=48K for Rx, leaving 16K for Tx.
2357          * After the 82547 the buffer was reduced to 40K.
2358          *   Default allocation: PBA=30K for Rx, leaving 10K for Tx.
2359          *   Note: default does not leave enough room for Jumbo Frame >10k.
2360          */
2361         switch (adapter->hw.mac.type) {
2362         case e1000_82547:
2363         case e1000_82547_rev_2: /* 82547: Total Packet Buffer is 40K */
2364                 if (adapter->hw.mac.max_frame_size > 8192)
2365                         pba = E1000_PBA_22K; /* 22K for Rx, 18K for Tx */
2366                 else
2367                         pba = E1000_PBA_30K; /* 30K for Rx, 10K for Tx */
2368                 adapter->tx_fifo_head = 0;
2369                 adapter->tx_head_addr = pba << EM_TX_HEAD_ADDR_SHIFT;
2370                 adapter->tx_fifo_size =
2371                     (E1000_PBA_40K - pba) << EM_PBA_BYTES_SHIFT;
2372                 break;
2373
2374         /* Total Packet Buffer on these is 48K */
2375         case e1000_82571:
2376         case e1000_82572:
2377         case e1000_80003es2lan:
2378                 pba = E1000_PBA_32K; /* 32K for Rx, 16K for Tx */
2379                 break;
2380
2381         case e1000_82573: /* 82573: Total Packet Buffer is 32K */
2382                 pba = E1000_PBA_12K; /* 12K for Rx, 20K for Tx */
2383                 break;
2384
2385         case e1000_82574:
2386         case e1000_82583:
2387                 pba = E1000_PBA_20K; /* 20K for Rx, 20K for Tx */
2388                 break;
2389
2390         case e1000_ich8lan:
2391                 pba = E1000_PBA_8K;
2392                 break;
2393
2394         case e1000_ich9lan:
2395         case e1000_ich10lan:
2396 #define E1000_PBA_10K   0x000A
2397                 pba = E1000_PBA_10K;
2398                 break;
2399
2400         case e1000_pchlan:
2401         case e1000_pch2lan:
2402         case e1000_pch_lpt:
2403                 pba = E1000_PBA_26K;
2404                 break;
2405
2406         default:
2407                 /* Devices before 82547 had a Packet Buffer of 64K.   */
2408                 if (adapter->hw.mac.max_frame_size > 8192)
2409                         pba = E1000_PBA_40K; /* 40K for Rx, 24K for Tx */
2410                 else
2411                         pba = E1000_PBA_48K; /* 48K for Rx, 16K for Tx */
2412         }
2413         E1000_WRITE_REG(&adapter->hw, E1000_PBA, pba);
2414
2415         /*
2416          * These parameters control the automatic generation (Tx) and
2417          * response (Rx) to Ethernet PAUSE frames.
2418          * - High water mark should allow for at least two frames to be
2419          *   received after sending an XOFF.
2420          * - Low water mark works best when it is very near the high water mark.
2421          *   This allows the receiver to restart by sending XON when it has
2422          *   drained a bit. Here we use an arbitary value of 1500 which will
2423          *   restart after one full frame is pulled from the buffer. There
2424          *   could be several smaller frames in the buffer and if so they will
2425          *   not trigger the XON until their total number reduces the buffer
2426          *   by 1500.
2427          * - The pause time is fairly large at 1000 x 512ns = 512 usec.
2428          */
2429         rx_buffer_size =
2430                 (E1000_READ_REG(&adapter->hw, E1000_PBA) & 0xffff) << 10;
2431
2432         adapter->hw.fc.high_water = rx_buffer_size -
2433             roundup2(adapter->hw.mac.max_frame_size, 1024);
2434         adapter->hw.fc.low_water = adapter->hw.fc.high_water - 1500;
2435
2436         if (adapter->hw.mac.type == e1000_80003es2lan)
2437                 adapter->hw.fc.pause_time = 0xFFFF;
2438         else
2439                 adapter->hw.fc.pause_time = EM_FC_PAUSE_TIME;
2440
2441         adapter->hw.fc.send_xon = TRUE;
2442
2443         adapter->hw.fc.requested_mode = e1000_fc_full;
2444
2445         /*
2446          * Device specific overrides/settings
2447          */
2448         switch (adapter->hw.mac.type) {
2449         case e1000_pchlan:
2450                 /* Workaround: no TX flow ctrl for PCH */
2451                 adapter->hw.fc.requested_mode = e1000_fc_rx_pause;
2452                 adapter->hw.fc.pause_time = 0xFFFF; /* override */
2453                 if (adapter->arpcom.ac_if.if_mtu > ETHERMTU) {
2454                         adapter->hw.fc.high_water = 0x3500;
2455                         adapter->hw.fc.low_water = 0x1500;
2456                 } else {
2457                         adapter->hw.fc.high_water = 0x5000;
2458                         adapter->hw.fc.low_water = 0x3000;
2459                 }
2460                 adapter->hw.fc.refresh_time = 0x1000;
2461                 break;
2462
2463         case e1000_pch2lan:
2464         case e1000_pch_lpt:
2465                 adapter->hw.fc.high_water = 0x5C20;
2466                 adapter->hw.fc.low_water = 0x5048;
2467                 adapter->hw.fc.pause_time = 0x0650;
2468                 adapter->hw.fc.refresh_time = 0x0400;
2469                 /* Jumbos need adjusted PBA */
2470                 if (adapter->arpcom.ac_if.if_mtu > ETHERMTU)
2471                         E1000_WRITE_REG(&adapter->hw, E1000_PBA, 12);
2472                 else
2473                         E1000_WRITE_REG(&adapter->hw, E1000_PBA, 26);
2474                 break;
2475
2476         case e1000_ich9lan:
2477         case e1000_ich10lan:
2478                 if (adapter->arpcom.ac_if.if_mtu > ETHERMTU) {
2479                         adapter->hw.fc.high_water = 0x2800;
2480                         adapter->hw.fc.low_water =
2481                             adapter->hw.fc.high_water - 8;
2482                         break;
2483                 }
2484                 /* FALL THROUGH */
2485         default:
2486                 if (adapter->hw.mac.type == e1000_80003es2lan)
2487                         adapter->hw.fc.pause_time = 0xFFFF;
2488                 break;
2489         }
2490
2491         /* Issue a global reset */
2492         e1000_reset_hw(&adapter->hw);
2493         if (adapter->hw.mac.type >= e1000_82544)
2494                 E1000_WRITE_REG(&adapter->hw, E1000_WUC, 0);
2495         em_disable_aspm(adapter);
2496
2497         if (e1000_init_hw(&adapter->hw) < 0) {
2498                 device_printf(dev, "Hardware Initialization Failed\n");
2499                 return (EIO);
2500         }
2501
2502         E1000_WRITE_REG(&adapter->hw, E1000_VET, ETHERTYPE_VLAN);
2503         e1000_get_phy_info(&adapter->hw);
2504         e1000_check_for_link(&adapter->hw);
2505
2506         return (0);
2507 }
2508
2509 static void
2510 em_setup_ifp(struct adapter *adapter)
2511 {
2512         struct ifnet *ifp = &adapter->arpcom.ac_if;
2513
2514         if_initname(ifp, device_get_name(adapter->dev),
2515                     device_get_unit(adapter->dev));
2516         ifp->if_softc = adapter;
2517         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
2518         ifp->if_init =  em_init;
2519         ifp->if_ioctl = em_ioctl;
2520         ifp->if_start = em_start;
2521 #ifdef IFPOLL_ENABLE
2522         ifp->if_npoll = em_npoll;
2523 #endif
2524         ifp->if_watchdog = em_watchdog;
2525         ifq_set_maxlen(&ifp->if_snd, adapter->num_tx_desc - 1);
2526         ifq_set_ready(&ifp->if_snd);
2527
2528         ether_ifattach(ifp, adapter->hw.mac.addr, NULL);
2529
2530         ifp->if_capabilities = IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU;
2531         if (adapter->hw.mac.type >= e1000_82543)
2532                 ifp->if_capabilities |= IFCAP_HWCSUM;
2533         if (adapter->flags & EM_FLAG_TSO)
2534                 ifp->if_capabilities |= IFCAP_TSO;
2535         ifp->if_capenable = ifp->if_capabilities;
2536
2537         if (ifp->if_capenable & IFCAP_TXCSUM)
2538                 ifp->if_hwassist |= EM_CSUM_FEATURES;
2539         if (ifp->if_capenable & IFCAP_TSO)
2540                 ifp->if_hwassist |= CSUM_TSO;
2541
2542         /*
2543          * Tell the upper layer(s) we support long frames.
2544          */
2545         ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
2546
2547         /*
2548          * Specify the media types supported by this adapter and register
2549          * callbacks to update media and link information
2550          */
2551         if (adapter->hw.phy.media_type == e1000_media_type_fiber ||
2552             adapter->hw.phy.media_type == e1000_media_type_internal_serdes) {
2553                 u_char fiber_type = IFM_1000_SX; /* default type */
2554
2555                 if (adapter->hw.mac.type == e1000_82545)
2556                         fiber_type = IFM_1000_LX;
2557                 ifmedia_add(&adapter->media, IFM_ETHER | fiber_type | IFM_FDX,
2558                             0, NULL);
2559                 ifmedia_add(&adapter->media, IFM_ETHER | fiber_type, 0, NULL);
2560         } else {
2561                 ifmedia_add(&adapter->media, IFM_ETHER | IFM_10_T, 0, NULL);
2562                 ifmedia_add(&adapter->media, IFM_ETHER | IFM_10_T | IFM_FDX,
2563                             0, NULL);
2564                 ifmedia_add(&adapter->media, IFM_ETHER | IFM_100_TX,
2565                             0, NULL);
2566                 ifmedia_add(&adapter->media, IFM_ETHER | IFM_100_TX | IFM_FDX,
2567                             0, NULL);
2568                 if (adapter->hw.phy.type != e1000_phy_ife) {
2569                         ifmedia_add(&adapter->media,
2570                                 IFM_ETHER | IFM_1000_T | IFM_FDX, 0, NULL);
2571                         ifmedia_add(&adapter->media,
2572                                 IFM_ETHER | IFM_1000_T, 0, NULL);
2573                 }
2574         }
2575         ifmedia_add(&adapter->media, IFM_ETHER | IFM_AUTO, 0, NULL);
2576         ifmedia_set(&adapter->media, IFM_ETHER | IFM_AUTO);
2577 }
2578
2579
2580 /*
2581  * Workaround for SmartSpeed on 82541 and 82547 controllers
2582  */
2583 static void
2584 em_smartspeed(struct adapter *adapter)
2585 {
2586         uint16_t phy_tmp;
2587
2588         if (adapter->link_active || adapter->hw.phy.type != e1000_phy_igp ||
2589             adapter->hw.mac.autoneg == 0 ||
2590             (adapter->hw.phy.autoneg_advertised & ADVERTISE_1000_FULL) == 0)
2591                 return;
2592
2593         if (adapter->smartspeed == 0) {
2594                 /*
2595                  * If Master/Slave config fault is asserted twice,
2596                  * we assume back-to-back
2597                  */
2598                 e1000_read_phy_reg(&adapter->hw, PHY_1000T_STATUS, &phy_tmp);
2599                 if (!(phy_tmp & SR_1000T_MS_CONFIG_FAULT))
2600                         return;
2601                 e1000_read_phy_reg(&adapter->hw, PHY_1000T_STATUS, &phy_tmp);
2602                 if (phy_tmp & SR_1000T_MS_CONFIG_FAULT) {
2603                         e1000_read_phy_reg(&adapter->hw,
2604                             PHY_1000T_CTRL, &phy_tmp);
2605                         if (phy_tmp & CR_1000T_MS_ENABLE) {
2606                                 phy_tmp &= ~CR_1000T_MS_ENABLE;
2607                                 e1000_write_phy_reg(&adapter->hw,
2608                                     PHY_1000T_CTRL, phy_tmp);
2609                                 adapter->smartspeed++;
2610                                 if (adapter->hw.mac.autoneg &&
2611                                     !e1000_phy_setup_autoneg(&adapter->hw) &&
2612                                     !e1000_read_phy_reg(&adapter->hw,
2613                                      PHY_CONTROL, &phy_tmp)) {
2614                                         phy_tmp |= MII_CR_AUTO_NEG_EN |
2615                                                    MII_CR_RESTART_AUTO_NEG;
2616                                         e1000_write_phy_reg(&adapter->hw,
2617                                             PHY_CONTROL, phy_tmp);
2618                                 }
2619                         }
2620                 }
2621                 return;
2622         } else if (adapter->smartspeed == EM_SMARTSPEED_DOWNSHIFT) {
2623                 /* If still no link, perhaps using 2/3 pair cable */
2624                 e1000_read_phy_reg(&adapter->hw, PHY_1000T_CTRL, &phy_tmp);
2625                 phy_tmp |= CR_1000T_MS_ENABLE;
2626                 e1000_write_phy_reg(&adapter->hw, PHY_1000T_CTRL, phy_tmp);
2627                 if (adapter->hw.mac.autoneg &&
2628                     !e1000_phy_setup_autoneg(&adapter->hw) &&
2629                     !e1000_read_phy_reg(&adapter->hw, PHY_CONTROL, &phy_tmp)) {
2630                         phy_tmp |= MII_CR_AUTO_NEG_EN | MII_CR_RESTART_AUTO_NEG;
2631                         e1000_write_phy_reg(&adapter->hw, PHY_CONTROL, phy_tmp);
2632                 }
2633         }
2634
2635         /* Restart process after EM_SMARTSPEED_MAX iterations */
2636         if (adapter->smartspeed++ == EM_SMARTSPEED_MAX)
2637                 adapter->smartspeed = 0;
2638 }
2639
2640 static int
2641 em_dma_malloc(struct adapter *adapter, bus_size_t size,
2642               struct em_dma_alloc *dma)
2643 {
2644         dma->dma_vaddr = bus_dmamem_coherent_any(adapter->parent_dtag,
2645                                 EM_DBA_ALIGN, size, BUS_DMA_WAITOK,
2646                                 &dma->dma_tag, &dma->dma_map,
2647                                 &dma->dma_paddr);
2648         if (dma->dma_vaddr == NULL)
2649                 return ENOMEM;
2650         else
2651                 return 0;
2652 }
2653
2654 static void
2655 em_dma_free(struct adapter *adapter, struct em_dma_alloc *dma)
2656 {
2657         if (dma->dma_tag == NULL)
2658                 return;
2659         bus_dmamap_unload(dma->dma_tag, dma->dma_map);
2660         bus_dmamem_free(dma->dma_tag, dma->dma_vaddr, dma->dma_map);
2661         bus_dma_tag_destroy(dma->dma_tag);
2662 }
2663
2664 static int
2665 em_create_tx_ring(struct adapter *adapter)
2666 {
2667         device_t dev = adapter->dev;
2668         struct em_buffer *tx_buffer;
2669         int error, i;
2670
2671         adapter->tx_buffer_area =
2672                 kmalloc(sizeof(struct em_buffer) * adapter->num_tx_desc,
2673                         M_DEVBUF, M_WAITOK | M_ZERO);
2674
2675         /*
2676          * Create DMA tags for tx buffers
2677          */
2678         error = bus_dma_tag_create(adapter->parent_dtag, /* parent */
2679                         1, 0,                   /* alignment, bounds */
2680                         BUS_SPACE_MAXADDR,      /* lowaddr */
2681                         BUS_SPACE_MAXADDR,      /* highaddr */
2682                         NULL, NULL,             /* filter, filterarg */
2683                         EM_TSO_SIZE,            /* maxsize */
2684                         EM_MAX_SCATTER,         /* nsegments */
2685                         PAGE_SIZE,              /* maxsegsize */
2686                         BUS_DMA_WAITOK | BUS_DMA_ALLOCNOW |
2687                         BUS_DMA_ONEBPAGE,       /* flags */
2688                         &adapter->txtag);
2689         if (error) {
2690                 device_printf(dev, "Unable to allocate TX DMA tag\n");
2691                 kfree(adapter->tx_buffer_area, M_DEVBUF);
2692                 adapter->tx_buffer_area = NULL;
2693                 return error;
2694         }
2695
2696         /*
2697          * Create DMA maps for tx buffers
2698          */
2699         for (i = 0; i < adapter->num_tx_desc; i++) {
2700                 tx_buffer = &adapter->tx_buffer_area[i];
2701
2702                 error = bus_dmamap_create(adapter->txtag,
2703                                           BUS_DMA_WAITOK | BUS_DMA_ONEBPAGE,
2704                                           &tx_buffer->map);
2705                 if (error) {
2706                         device_printf(dev, "Unable to create TX DMA map\n");
2707                         em_destroy_tx_ring(adapter, i);
2708                         return error;
2709                 }
2710         }
2711         return (0);
2712 }
2713
2714 static void
2715 em_init_tx_ring(struct adapter *adapter)
2716 {
2717         /* Clear the old ring contents */
2718         bzero(adapter->tx_desc_base,
2719             (sizeof(struct e1000_tx_desc)) * adapter->num_tx_desc);
2720
2721         /* Reset state */
2722         adapter->next_avail_tx_desc = 0;
2723         adapter->next_tx_to_clean = 0;
2724         adapter->num_tx_desc_avail = adapter->num_tx_desc;
2725 }
2726
2727 static void
2728 em_init_tx_unit(struct adapter *adapter)
2729 {
2730         uint32_t tctl, tarc, tipg = 0;
2731         uint64_t bus_addr;
2732
2733         /* Setup the Base and Length of the Tx Descriptor Ring */
2734         bus_addr = adapter->txdma.dma_paddr;
2735         E1000_WRITE_REG(&adapter->hw, E1000_TDLEN(0),
2736             adapter->num_tx_desc * sizeof(struct e1000_tx_desc));
2737         E1000_WRITE_REG(&adapter->hw, E1000_TDBAH(0),
2738             (uint32_t)(bus_addr >> 32));
2739         E1000_WRITE_REG(&adapter->hw, E1000_TDBAL(0),
2740             (uint32_t)bus_addr);
2741         /* Setup the HW Tx Head and Tail descriptor pointers */
2742         E1000_WRITE_REG(&adapter->hw, E1000_TDT(0), 0);
2743         E1000_WRITE_REG(&adapter->hw, E1000_TDH(0), 0);
2744
2745         /* Set the default values for the Tx Inter Packet Gap timer */
2746         switch (adapter->hw.mac.type) {
2747         case e1000_82542:
2748                 tipg = DEFAULT_82542_TIPG_IPGT;
2749                 tipg |= DEFAULT_82542_TIPG_IPGR1 << E1000_TIPG_IPGR1_SHIFT;
2750                 tipg |= DEFAULT_82542_TIPG_IPGR2 << E1000_TIPG_IPGR2_SHIFT;
2751                 break;
2752
2753         case e1000_80003es2lan:
2754                 tipg = DEFAULT_82543_TIPG_IPGR1;
2755                 tipg |= DEFAULT_80003ES2LAN_TIPG_IPGR2 <<
2756                     E1000_TIPG_IPGR2_SHIFT;
2757                 break;
2758
2759         default:
2760                 if (adapter->hw.phy.media_type == e1000_media_type_fiber ||
2761                     adapter->hw.phy.media_type ==
2762                     e1000_media_type_internal_serdes)
2763                         tipg = DEFAULT_82543_TIPG_IPGT_FIBER;
2764                 else
2765                         tipg = DEFAULT_82543_TIPG_IPGT_COPPER;
2766                 tipg |= DEFAULT_82543_TIPG_IPGR1 << E1000_TIPG_IPGR1_SHIFT;
2767                 tipg |= DEFAULT_82543_TIPG_IPGR2 << E1000_TIPG_IPGR2_SHIFT;
2768                 break;
2769         }
2770
2771         E1000_WRITE_REG(&adapter->hw, E1000_TIPG, tipg);
2772
2773         /* NOTE: 0 is not allowed for TIDV */
2774         E1000_WRITE_REG(&adapter->hw, E1000_TIDV, 1);
2775         if(adapter->hw.mac.type >= e1000_82540)
2776                 E1000_WRITE_REG(&adapter->hw, E1000_TADV, 0);
2777
2778         if (adapter->hw.mac.type == e1000_82571 ||
2779             adapter->hw.mac.type == e1000_82572) {
2780                 tarc = E1000_READ_REG(&adapter->hw, E1000_TARC(0));
2781                 tarc |= SPEED_MODE_BIT;
2782                 E1000_WRITE_REG(&adapter->hw, E1000_TARC(0), tarc);
2783         } else if (adapter->hw.mac.type == e1000_80003es2lan) {
2784                 tarc = E1000_READ_REG(&adapter->hw, E1000_TARC(0));
2785                 tarc |= 1;
2786                 E1000_WRITE_REG(&adapter->hw, E1000_TARC(0), tarc);
2787                 tarc = E1000_READ_REG(&adapter->hw, E1000_TARC(1));
2788                 tarc |= 1;
2789                 E1000_WRITE_REG(&adapter->hw, E1000_TARC(1), tarc);
2790         }
2791
2792         /* Program the Transmit Control Register */
2793         tctl = E1000_READ_REG(&adapter->hw, E1000_TCTL);
2794         tctl &= ~E1000_TCTL_CT;
2795         tctl |= E1000_TCTL_PSP | E1000_TCTL_RTLC | E1000_TCTL_EN |
2796                 (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT);
2797
2798         if (adapter->hw.mac.type >= e1000_82571)
2799                 tctl |= E1000_TCTL_MULR;
2800
2801         /* This write will effectively turn on the transmit unit. */
2802         E1000_WRITE_REG(&adapter->hw, E1000_TCTL, tctl);
2803
2804         if (adapter->hw.mac.type == e1000_82571 ||
2805             adapter->hw.mac.type == e1000_82572 ||
2806             adapter->hw.mac.type == e1000_80003es2lan) {
2807                 /* Bit 28 of TARC1 must be cleared when MULR is enabled */
2808                 tarc = E1000_READ_REG(&adapter->hw, E1000_TARC(1));
2809                 tarc &= ~(1 << 28);
2810                 E1000_WRITE_REG(&adapter->hw, E1000_TARC(1), tarc);
2811         }
2812 }
2813
2814 static void
2815 em_destroy_tx_ring(struct adapter *adapter, int ndesc)
2816 {
2817         struct em_buffer *tx_buffer;
2818         int i;
2819
2820         if (adapter->tx_buffer_area == NULL)
2821                 return;
2822
2823         for (i = 0; i < ndesc; i++) {
2824                 tx_buffer = &adapter->tx_buffer_area[i];
2825
2826                 KKASSERT(tx_buffer->m_head == NULL);
2827                 bus_dmamap_destroy(adapter->txtag, tx_buffer->map);
2828         }
2829         bus_dma_tag_destroy(adapter->txtag);
2830
2831         kfree(adapter->tx_buffer_area, M_DEVBUF);
2832         adapter->tx_buffer_area = NULL;
2833 }
2834
2835 /*
2836  * The offload context needs to be set when we transfer the first
2837  * packet of a particular protocol (TCP/UDP).  This routine has been
2838  * enhanced to deal with inserted VLAN headers.
2839  *
2840  * If the new packet's ether header length, ip header length and
2841  * csum offloading type are same as the previous packet, we should
2842  * avoid allocating a new csum context descriptor; mainly to take
2843  * advantage of the pipeline effect of the TX data read request.
2844  *
2845  * This function returns number of TX descrptors allocated for
2846  * csum context.
2847  */
2848 static int
2849 em_txcsum(struct adapter *adapter, struct mbuf *mp,
2850           uint32_t *txd_upper, uint32_t *txd_lower)
2851 {
2852         struct e1000_context_desc *TXD;
2853         int curr_txd, ehdrlen, csum_flags;
2854         uint32_t cmd, hdr_len, ip_hlen;
2855
2856         csum_flags = mp->m_pkthdr.csum_flags & EM_CSUM_FEATURES;
2857         ip_hlen = mp->m_pkthdr.csum_iphlen;
2858         ehdrlen = mp->m_pkthdr.csum_lhlen;
2859
2860         if (adapter->csum_lhlen == ehdrlen &&
2861             adapter->csum_iphlen == ip_hlen &&
2862             adapter->csum_flags == csum_flags) {
2863                 /*
2864                  * Same csum offload context as the previous packets;
2865                  * just return.
2866                  */
2867                 *txd_upper = adapter->csum_txd_upper;
2868                 *txd_lower = adapter->csum_txd_lower;
2869                 return 0;
2870         }
2871
2872         /*
2873          * Setup a new csum offload context.
2874          */
2875
2876         curr_txd = adapter->next_avail_tx_desc;
2877         TXD = (struct e1000_context_desc *)&adapter->tx_desc_base[curr_txd];
2878
2879         cmd = 0;
2880
2881         /* Setup of IP header checksum. */
2882         if (csum_flags & CSUM_IP) {
2883                 /*
2884                  * Start offset for header checksum calculation.
2885                  * End offset for header checksum calculation.
2886                  * Offset of place to put the checksum.
2887                  */
2888                 TXD->lower_setup.ip_fields.ipcss = ehdrlen;
2889                 TXD->lower_setup.ip_fields.ipcse =
2890                     htole16(ehdrlen + ip_hlen - 1);
2891                 TXD->lower_setup.ip_fields.ipcso =
2892                     ehdrlen + offsetof(struct ip, ip_sum);
2893                 cmd |= E1000_TXD_CMD_IP;
2894                 *txd_upper |= E1000_TXD_POPTS_IXSM << 8;
2895         }
2896         hdr_len = ehdrlen + ip_hlen;
2897
2898         if (csum_flags & CSUM_TCP) {
2899                 /*
2900                  * Start offset for payload checksum calculation.
2901                  * End offset for payload checksum calculation.
2902                  * Offset of place to put the checksum.
2903                  */
2904                 TXD->upper_setup.tcp_fields.tucss = hdr_len;
2905                 TXD->upper_setup.tcp_fields.tucse = htole16(0);
2906                 TXD->upper_setup.tcp_fields.tucso =
2907                     hdr_len + offsetof(struct tcphdr, th_sum);
2908                 cmd |= E1000_TXD_CMD_TCP;
2909                 *txd_upper |= E1000_TXD_POPTS_TXSM << 8;
2910         } else if (csum_flags & CSUM_UDP) {
2911                 /*
2912                  * Start offset for header checksum calculation.
2913                  * End offset for header checksum calculation.
2914                  * Offset of place to put the checksum.
2915                  */
2916                 TXD->upper_setup.tcp_fields.tucss = hdr_len;
2917                 TXD->upper_setup.tcp_fields.tucse = htole16(0);
2918                 TXD->upper_setup.tcp_fields.tucso =
2919                     hdr_len + offsetof(struct udphdr, uh_sum);
2920                 *txd_upper |= E1000_TXD_POPTS_TXSM << 8;
2921         }
2922
2923         *txd_lower = E1000_TXD_CMD_DEXT |       /* Extended descr type */
2924                      E1000_TXD_DTYP_D;          /* Data descr */
2925
2926         /* Save the information for this csum offloading context */
2927         adapter->csum_lhlen = ehdrlen;
2928         adapter->csum_iphlen = ip_hlen;
2929         adapter->csum_flags = csum_flags;
2930         adapter->csum_txd_upper = *txd_upper;
2931         adapter->csum_txd_lower = *txd_lower;
2932
2933         TXD->tcp_seg_setup.data = htole32(0);
2934         TXD->cmd_and_length =
2935             htole32(E1000_TXD_CMD_IFCS | E1000_TXD_CMD_DEXT | cmd);
2936
2937         if (++curr_txd == adapter->num_tx_desc)
2938                 curr_txd = 0;
2939
2940         KKASSERT(adapter->num_tx_desc_avail > 0);
2941         adapter->num_tx_desc_avail--;
2942
2943         adapter->next_avail_tx_desc = curr_txd;
2944         return 1;
2945 }
2946
2947 static void
2948 em_txeof(struct adapter *adapter)
2949 {
2950         struct ifnet *ifp = &adapter->arpcom.ac_if;
2951         struct em_buffer *tx_buffer;
2952         int first, num_avail;
2953
2954         if (adapter->tx_dd_head == adapter->tx_dd_tail)
2955                 return;
2956
2957         if (adapter->num_tx_desc_avail == adapter->num_tx_desc)
2958                 return;
2959
2960         num_avail = adapter->num_tx_desc_avail;
2961         first = adapter->next_tx_to_clean;
2962
2963         while (adapter->tx_dd_head != adapter->tx_dd_tail) {
2964                 struct e1000_tx_desc *tx_desc;
2965                 int dd_idx = adapter->tx_dd[adapter->tx_dd_head];
2966
2967                 tx_desc = &adapter->tx_desc_base[dd_idx];
2968                 if (tx_desc->upper.fields.status & E1000_TXD_STAT_DD) {
2969                         EM_INC_TXDD_IDX(adapter->tx_dd_head);
2970
2971                         if (++dd_idx == adapter->num_tx_desc)
2972                                 dd_idx = 0;
2973
2974                         while (first != dd_idx) {
2975                                 logif(pkt_txclean);
2976
2977                                 num_avail++;
2978
2979                                 tx_buffer = &adapter->tx_buffer_area[first];
2980                                 if (tx_buffer->m_head) {
2981                                         bus_dmamap_unload(adapter->txtag,
2982                                                           tx_buffer->map);
2983                                         m_freem(tx_buffer->m_head);
2984                                         tx_buffer->m_head = NULL;
2985                                 }
2986
2987                                 if (++first == adapter->num_tx_desc)
2988                                         first = 0;
2989                         }
2990                 } else {
2991                         break;
2992                 }
2993         }
2994         adapter->next_tx_to_clean = first;
2995         adapter->num_tx_desc_avail = num_avail;
2996
2997         if (adapter->tx_dd_head == adapter->tx_dd_tail) {
2998                 adapter->tx_dd_head = 0;
2999                 adapter->tx_dd_tail = 0;
3000         }
3001
3002         if (!EM_IS_OACTIVE(adapter)) {
3003                 ifq_clr_oactive(&ifp->if_snd);
3004
3005                 /* All clean, turn off the timer */
3006                 if (adapter->num_tx_desc_avail == adapter->num_tx_desc)
3007                         ifp->if_timer = 0;
3008         }
3009 }
3010
3011 static void
3012 em_tx_collect(struct adapter *adapter)
3013 {
3014         struct ifnet *ifp = &adapter->arpcom.ac_if;
3015         struct em_buffer *tx_buffer;
3016         int tdh, first, num_avail, dd_idx = -1;
3017
3018         if (adapter->num_tx_desc_avail == adapter->num_tx_desc)
3019                 return;
3020
3021         tdh = E1000_READ_REG(&adapter->hw, E1000_TDH(0));
3022         if (tdh == adapter->next_tx_to_clean)
3023                 return;
3024
3025         if (adapter->tx_dd_head != adapter->tx_dd_tail)
3026                 dd_idx = adapter->tx_dd[adapter->tx_dd_head];
3027
3028         num_avail = adapter->num_tx_desc_avail;
3029         first = adapter->next_tx_to_clean;
3030
3031         while (first != tdh) {
3032                 logif(pkt_txclean);
3033
3034                 num_avail++;
3035
3036                 tx_buffer = &adapter->tx_buffer_area[first];
3037                 if (tx_buffer->m_head) {
3038                         bus_dmamap_unload(adapter->txtag,
3039                                           tx_buffer->map);
3040                         m_freem(tx_buffer->m_head);
3041                         tx_buffer->m_head = NULL;
3042                 }
3043
3044                 if (first == dd_idx) {
3045                         EM_INC_TXDD_IDX(adapter->tx_dd_head);
3046                         if (adapter->tx_dd_head == adapter->tx_dd_tail) {
3047                                 adapter->tx_dd_head = 0;
3048                                 adapter->tx_dd_tail = 0;
3049                                 dd_idx = -1;
3050                         } else {
3051                                 dd_idx = adapter->tx_dd[adapter->tx_dd_head];
3052                         }
3053                 }
3054
3055                 if (++first == adapter->num_tx_desc)
3056                         first = 0;
3057         }
3058         adapter->next_tx_to_clean = first;
3059         adapter->num_tx_desc_avail = num_avail;
3060
3061         if (!EM_IS_OACTIVE(adapter)) {
3062                 ifq_clr_oactive(&ifp->if_snd);
3063
3064                 /* All clean, turn off the timer */
3065                 if (adapter->num_tx_desc_avail == adapter->num_tx_desc)
3066                         ifp->if_timer = 0;
3067         }
3068 }
3069
3070 /*
3071  * When Link is lost sometimes there is work still in the TX ring
3072  * which will result in a watchdog, rather than allow that do an
3073  * attempted cleanup and then reinit here.  Note that this has been
3074  * seens mostly with fiber adapters.
3075  */
3076 static void
3077 em_tx_purge(struct adapter *adapter)
3078 {
3079         struct ifnet *ifp = &adapter->arpcom.ac_if;
3080
3081         if (!adapter->link_active && ifp->if_timer) {
3082                 em_tx_collect(adapter);
3083                 if (ifp->if_timer) {
3084                         if_printf(ifp, "Link lost, TX pending, reinit\n");
3085                         ifp->if_timer = 0;
3086                         em_init(adapter);
3087                 }
3088         }
3089 }
3090
3091 static int
3092 em_newbuf(struct adapter *adapter, int i, int init)
3093 {
3094         struct mbuf *m;
3095         bus_dma_segment_t seg;
3096         bus_dmamap_t map;
3097         struct em_buffer *rx_buffer;
3098         int error, nseg;
3099
3100         m = m_getcl(init ? M_WAITOK : M_NOWAIT, MT_DATA, M_PKTHDR);
3101         if (m == NULL) {
3102                 adapter->mbuf_cluster_failed++;
3103                 if (init) {
3104                         if_printf(&adapter->arpcom.ac_if,
3105                                   "Unable to allocate RX mbuf\n");
3106                 }
3107                 return (ENOBUFS);
3108         }
3109         m->m_len = m->m_pkthdr.len = MCLBYTES;
3110
3111         if (adapter->hw.mac.max_frame_size <= MCLBYTES - ETHER_ALIGN)
3112                 m_adj(m, ETHER_ALIGN);
3113
3114         error = bus_dmamap_load_mbuf_segment(adapter->rxtag,
3115                         adapter->rx_sparemap, m,
3116                         &seg, 1, &nseg, BUS_DMA_NOWAIT);
3117         if (error) {
3118                 m_freem(m);
3119                 if (init) {
3120                         if_printf(&adapter->arpcom.ac_if,
3121                                   "Unable to load RX mbuf\n");
3122                 }
3123                 return (error);
3124         }
3125
3126         rx_buffer = &adapter->rx_buffer_area[i];
3127         if (rx_buffer->m_head != NULL)
3128                 bus_dmamap_unload(adapter->rxtag, rx_buffer->map);
3129
3130         map = rx_buffer->map;
3131         rx_buffer->map = adapter->rx_sparemap;
3132         adapter->rx_sparemap = map;
3133
3134         rx_buffer->m_head = m;
3135
3136         adapter->rx_desc_base[i].buffer_addr = htole64(seg.ds_addr);
3137         return (0);
3138 }
3139
3140 static int
3141 em_create_rx_ring(struct adapter *adapter)
3142 {
3143         device_t dev = adapter->dev;
3144         struct em_buffer *rx_buffer;
3145         int i, error;
3146
3147         adapter->rx_buffer_area =
3148                 kmalloc(sizeof(struct em_buffer) * adapter->num_rx_desc,
3149                         M_DEVBUF, M_WAITOK | M_ZERO);
3150
3151         /*
3152          * Create DMA tag for rx buffers
3153          */
3154         error = bus_dma_tag_create(adapter->parent_dtag, /* parent */
3155                         1, 0,                   /* alignment, bounds */
3156                         BUS_SPACE_MAXADDR,      /* lowaddr */
3157                         BUS_SPACE_MAXADDR,      /* highaddr */
3158                         NULL, NULL,             /* filter, filterarg */
3159                         MCLBYTES,               /* maxsize */
3160                         1,                      /* nsegments */
3161                         MCLBYTES,               /* maxsegsize */
3162                         BUS_DMA_WAITOK | BUS_DMA_ALLOCNOW, /* flags */
3163                         &adapter->rxtag);
3164         if (error) {
3165                 device_printf(dev, "Unable to allocate RX DMA tag\n");
3166                 kfree(adapter->rx_buffer_area, M_DEVBUF);
3167                 adapter->rx_buffer_area = NULL;
3168                 return error;
3169         }
3170
3171         /*
3172          * Create spare DMA map for rx buffers
3173          */
3174         error = bus_dmamap_create(adapter->rxtag, BUS_DMA_WAITOK,
3175                                   &adapter->rx_sparemap);
3176         if (error) {
3177                 device_printf(dev, "Unable to create spare RX DMA map\n");
3178                 bus_dma_tag_destroy(adapter->rxtag);
3179                 kfree(adapter->rx_buffer_area, M_DEVBUF);
3180                 adapter->rx_buffer_area = NULL;
3181                 return error;
3182         }
3183
3184         /*
3185          * Create DMA maps for rx buffers
3186          */
3187         for (i = 0; i < adapter->num_rx_desc; i++) {
3188                 rx_buffer = &adapter->rx_buffer_area[i];
3189
3190                 error = bus_dmamap_create(adapter->rxtag, BUS_DMA_WAITOK,
3191                                           &rx_buffer->map);
3192                 if (error) {
3193                         device_printf(dev, "Unable to create RX DMA map\n");
3194                         em_destroy_rx_ring(adapter, i);
3195                         return error;
3196                 }
3197         }
3198         return (0);
3199 }
3200
3201 static int
3202 em_init_rx_ring(struct adapter *adapter)
3203 {
3204         int i, error;
3205
3206         /* Reset descriptor ring */
3207         bzero(adapter->rx_desc_base,
3208             (sizeof(struct e1000_rx_desc)) * adapter->num_rx_desc);
3209
3210         /* Allocate new ones. */
3211         for (i = 0; i < adapter->num_rx_desc; i++) {
3212                 error = em_newbuf(adapter, i, 1);
3213                 if (error)
3214                         return (error);
3215         }
3216
3217         /* Setup our descriptor pointers */
3218         adapter->next_rx_desc_to_check = 0;
3219
3220         return (0);
3221 }
3222
3223 static void
3224 em_init_rx_unit(struct adapter *adapter)
3225 {
3226         struct ifnet *ifp = &adapter->arpcom.ac_if;
3227         uint64_t bus_addr;
3228         uint32_t rctl;
3229
3230         /*
3231          * Make sure receives are disabled while setting
3232          * up the descriptor ring
3233          */
3234         rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);
3235         E1000_WRITE_REG(&adapter->hw, E1000_RCTL, rctl & ~E1000_RCTL_EN);
3236
3237         if (adapter->hw.mac.type >= e1000_82540) {
3238                 uint32_t itr;
3239
3240                 /*
3241                  * Set the interrupt throttling rate. Value is calculated
3242                  * as ITR = 1 / (INT_THROTTLE_CEIL * 256ns)
3243                  */
3244                 if (adapter->int_throttle_ceil)
3245                         itr = 1000000000 / 256 / adapter->int_throttle_ceil;
3246                 else
3247                         itr = 0;
3248                 em_set_itr(adapter, itr);
3249         }
3250
3251         /* Disable accelerated ackknowledge */
3252         if (adapter->hw.mac.type == e1000_82574) {
3253                 E1000_WRITE_REG(&adapter->hw,
3254                     E1000_RFCTL, E1000_RFCTL_ACK_DIS);
3255         }
3256
3257         /* Receive Checksum Offload for TCP and UDP */
3258         if (ifp->if_capenable & IFCAP_RXCSUM) {
3259                 uint32_t rxcsum;
3260
3261                 rxcsum = E1000_READ_REG(&adapter->hw, E1000_RXCSUM);
3262                 rxcsum |= (E1000_RXCSUM_IPOFL | E1000_RXCSUM_TUOFL);
3263                 E1000_WRITE_REG(&adapter->hw, E1000_RXCSUM, rxcsum);
3264         }
3265
3266         /*
3267          * XXX TEMPORARY WORKAROUND: on some systems with 82573
3268          * long latencies are observed, like Lenovo X60. This
3269          * change eliminates the problem, but since having positive
3270          * values in RDTR is a known source of problems on other
3271          * platforms another solution is being sought.
3272          */
3273         if (em_82573_workaround && adapter->hw.mac.type == e1000_82573) {
3274                 E1000_WRITE_REG(&adapter->hw, E1000_RADV, EM_RADV_82573);
3275                 E1000_WRITE_REG(&adapter->hw, E1000_RDTR, EM_RDTR_82573);
3276         }
3277
3278         /*
3279          * Setup the Base and Length of the Rx Descriptor Ring
3280          */
3281         bus_addr = adapter->rxdma.dma_paddr;
3282         E1000_WRITE_REG(&adapter->hw, E1000_RDLEN(0),
3283             adapter->num_rx_desc * sizeof(struct e1000_rx_desc));
3284         E1000_WRITE_REG(&adapter->hw, E1000_RDBAH(0),
3285             (uint32_t)(bus_addr >> 32));
3286         E1000_WRITE_REG(&adapter->hw, E1000_RDBAL(0),
3287             (uint32_t)bus_addr);
3288
3289         /*
3290          * Setup the HW Rx Head and Tail Descriptor Pointers
3291          */
3292         E1000_WRITE_REG(&adapter->hw, E1000_RDH(0), 0);
3293         E1000_WRITE_REG(&adapter->hw, E1000_RDT(0), adapter->num_rx_desc - 1);
3294
3295         /* Set PTHRESH for improved jumbo performance */
3296         if (((adapter->hw.mac.type == e1000_ich9lan) ||
3297             (adapter->hw.mac.type == e1000_pch2lan) ||
3298             (adapter->hw.mac.type == e1000_ich10lan)) &&
3299             (ifp->if_mtu > ETHERMTU)) {
3300                 uint32_t rxdctl;
3301
3302                 rxdctl = E1000_READ_REG(&adapter->hw, E1000_RXDCTL(0));
3303                 E1000_WRITE_REG(&adapter->hw, E1000_RXDCTL(0), rxdctl | 3);
3304         }
3305
3306         if (adapter->hw.mac.type >= e1000_pch2lan) {
3307                 if (ifp->if_mtu > ETHERMTU)
3308                         e1000_lv_jumbo_workaround_ich8lan(&adapter->hw, TRUE);
3309                 else
3310                         e1000_lv_jumbo_workaround_ich8lan(&adapter->hw, FALSE);
3311         }
3312
3313         /* Setup the Receive Control Register */
3314         rctl &= ~(3 << E1000_RCTL_MO_SHIFT);
3315         rctl |= E1000_RCTL_EN | E1000_RCTL_BAM | E1000_RCTL_LBM_NO |
3316                 E1000_RCTL_RDMTS_HALF |
3317                 (adapter->hw.mac.mc_filter_type << E1000_RCTL_MO_SHIFT);
3318
3319         /* Make sure VLAN Filters are off */
3320         rctl &= ~E1000_RCTL_VFE;
3321
3322         if (e1000_tbi_sbp_enabled_82543(&adapter->hw))
3323                 rctl |= E1000_RCTL_SBP;
3324         else
3325                 rctl &= ~E1000_RCTL_SBP;
3326
3327         switch (adapter->rx_buffer_len) {
3328         default:
3329         case 2048:
3330                 rctl |= E1000_RCTL_SZ_2048;
3331                 break;
3332
3333         case 4096:
3334                 rctl |= E1000_RCTL_SZ_4096 |
3335                     E1000_RCTL_BSEX | E1000_RCTL_LPE;
3336                 break;
3337
3338         case 8192:
3339                 rctl |= E1000_RCTL_SZ_8192 |
3340                     E1000_RCTL_BSEX | E1000_RCTL_LPE;
3341                 break;
3342
3343         case 16384:
3344                 rctl |= E1000_RCTL_SZ_16384 |
3345                     E1000_RCTL_BSEX | E1000_RCTL_LPE;
3346                 break;
3347         }
3348
3349         if (ifp->if_mtu > ETHERMTU)
3350                 rctl |= E1000_RCTL_LPE;
3351         else
3352                 rctl &= ~E1000_RCTL_LPE;
3353
3354         /* Enable Receives */
3355         E1000_WRITE_REG(&adapter->hw, E1000_RCTL, rctl);
3356 }
3357
3358 static void
3359 em_destroy_rx_ring(struct adapter *adapter, int ndesc)
3360 {
3361         struct em_buffer *rx_buffer;
3362         int i;
3363
3364         if (adapter->rx_buffer_area == NULL)
3365                 return;
3366
3367         for (i = 0; i < ndesc; i++) {
3368                 rx_buffer = &adapter->rx_buffer_area[i];
3369
3370                 KKASSERT(rx_buffer->m_head == NULL);
3371                 bus_dmamap_destroy(adapter->rxtag, rx_buffer->map);
3372         }
3373         bus_dmamap_destroy(adapter->rxtag, adapter->rx_sparemap);
3374         bus_dma_tag_destroy(adapter->rxtag);
3375
3376         kfree(adapter->rx_buffer_area, M_DEVBUF);
3377         adapter->rx_buffer_area = NULL;
3378 }
3379
3380 static void
3381 em_rxeof(struct adapter *adapter, int count)
3382 {
3383         struct ifnet *ifp = &adapter->arpcom.ac_if;
3384         uint8_t status, accept_frame = 0, eop = 0;
3385         uint16_t len, desc_len, prev_len_adj;
3386         struct e1000_rx_desc *current_desc;
3387         struct mbuf *mp;
3388         int i;
3389
3390         i = adapter->next_rx_desc_to_check;
3391         current_desc = &adapter->rx_desc_base[i];
3392
3393         if (!(current_desc->status & E1000_RXD_STAT_DD))
3394                 return;
3395
3396         while ((current_desc->status & E1000_RXD_STAT_DD) && count != 0) {
3397                 struct mbuf *m = NULL;
3398
3399                 logif(pkt_receive);
3400
3401                 mp = adapter->rx_buffer_area[i].m_head;
3402
3403                 /*
3404                  * Can't defer bus_dmamap_sync(9) because TBI_ACCEPT
3405                  * needs to access the last received byte in the mbuf.
3406                  */
3407                 bus_dmamap_sync(adapter->rxtag, adapter->rx_buffer_area[i].map,
3408                                 BUS_DMASYNC_POSTREAD);
3409
3410                 accept_frame = 1;
3411                 prev_len_adj = 0;
3412                 desc_len = le16toh(current_desc->length);
3413                 status = current_desc->status;
3414                 if (status & E1000_RXD_STAT_EOP) {
3415                         count--;
3416                         eop = 1;
3417                         if (desc_len < ETHER_CRC_LEN) {
3418                                 len = 0;
3419                                 prev_len_adj = ETHER_CRC_LEN - desc_len;
3420                         } else {
3421                                 len = desc_len - ETHER_CRC_LEN;
3422                         }
3423                 } else {
3424                         eop = 0;
3425                         len = desc_len;
3426                 }
3427
3428                 if (current_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK) {
3429                         uint8_t last_byte;
3430                         uint32_t pkt_len = desc_len;
3431
3432                         if (adapter->fmp != NULL)
3433                                 pkt_len += adapter->fmp->m_pkthdr.len;
3434
3435                         last_byte = *(mtod(mp, caddr_t) + desc_len - 1);
3436                         if (TBI_ACCEPT(&adapter->hw, status,
3437                             current_desc->errors, pkt_len, last_byte,
3438                             adapter->min_frame_size,
3439                             adapter->hw.mac.max_frame_size)) {
3440                                 e1000_tbi_adjust_stats_82543(&adapter->hw,
3441                                     &adapter->stats, pkt_len,
3442                                     adapter->hw.mac.addr,
3443                                     adapter->hw.mac.max_frame_size);
3444                                 if (len > 0)
3445                                         len--;
3446                         } else {
3447                                 accept_frame = 0;
3448                         }
3449                 }
3450
3451                 if (accept_frame) {
3452                         if (em_newbuf(adapter, i, 0) != 0) {
3453                                 IFNET_STAT_INC(ifp, iqdrops, 1);
3454                                 goto discard;
3455                         }
3456
3457                         /* Assign correct length to the current fragment */
3458                         mp->m_len = len;
3459
3460                         if (adapter->fmp == NULL) {
3461                                 mp->m_pkthdr.len = len;
3462                                 adapter->fmp = mp; /* Store the first mbuf */
3463                                 adapter->lmp = mp;
3464                         } else {
3465                                 /*
3466                                  * Chain mbuf's together
3467                                  */
3468
3469                                 /*
3470                                  * Adjust length of previous mbuf in chain if
3471                                  * we received less than 4 bytes in the last
3472                                  * descriptor.
3473                                  */
3474                                 if (prev_len_adj > 0) {
3475                                         adapter->lmp->m_len -= prev_len_adj;
3476                                         adapter->fmp->m_pkthdr.len -=
3477                                             prev_len_adj;
3478                                 }
3479                                 adapter->lmp->m_next = mp;
3480                                 adapter->lmp = adapter->lmp->m_next;
3481                                 adapter->fmp->m_pkthdr.len += len;
3482                         }
3483
3484                         if (eop) {
3485                                 adapter->fmp->m_pkthdr.rcvif = ifp;
3486                                 IFNET_STAT_INC(ifp, ipackets, 1);
3487
3488                                 if (ifp->if_capenable & IFCAP_RXCSUM) {
3489                                         em_rxcsum(adapter, current_desc,
3490                                                   adapter->fmp);
3491                                 }
3492
3493                                 if (status & E1000_RXD_STAT_VP) {
3494                                         adapter->fmp->m_pkthdr.ether_vlantag =
3495                                             (le16toh(current_desc->special) &
3496                                             E1000_RXD_SPC_VLAN_MASK);
3497                                         adapter->fmp->m_flags |= M_VLANTAG;
3498                                 }
3499                                 m = adapter->fmp;
3500                                 adapter->fmp = NULL;
3501                                 adapter->lmp = NULL;
3502                         }
3503                 } else {
3504                         IFNET_STAT_INC(ifp, ierrors, 1);
3505 discard:
3506 #ifdef foo
3507                         /* Reuse loaded DMA map and just update mbuf chain */
3508                         mp = adapter->rx_buffer_area[i].m_head;
3509                         mp->m_len = mp->m_pkthdr.len = MCLBYTES;
3510                         mp->m_data = mp->m_ext.ext_buf;
3511                         mp->m_next = NULL;
3512                         if (adapter->hw.mac.max_frame_size <=
3513                             (MCLBYTES - ETHER_ALIGN))
3514                                 m_adj(mp, ETHER_ALIGN);
3515 #endif
3516                         if (adapter->fmp != NULL) {
3517                                 m_freem(adapter->fmp);
3518                                 adapter->fmp = NULL;
3519                                 adapter->lmp = NULL;
3520                         }
3521                         m = NULL;
3522                 }
3523
3524                 /* Zero out the receive descriptors status. */
3525                 current_desc->status = 0;
3526
3527                 if (m != NULL)
3528                         ifp->if_input(ifp, m, NULL, -1);
3529
3530                 /* Advance our pointers to the next descriptor. */
3531                 if (++i == adapter->num_rx_desc)
3532                         i = 0;
3533                 current_desc = &adapter->rx_desc_base[i];
3534         }
3535         adapter->next_rx_desc_to_check = i;
3536
3537         /* Advance the E1000's Receive Queue #0  "Tail Pointer". */
3538         if (--i < 0)
3539                 i = adapter->num_rx_desc - 1;
3540         E1000_WRITE_REG(&adapter->hw, E1000_RDT(0), i);
3541 }
3542
3543 static void
3544 em_rxcsum(struct adapter *adapter, struct e1000_rx_desc *rx_desc,
3545           struct mbuf *mp)
3546 {
3547         /* 82543 or newer only */
3548         if (adapter->hw.mac.type < e1000_82543 ||
3549             /* Ignore Checksum bit is set */
3550             (rx_desc->status & E1000_RXD_STAT_IXSM))
3551                 return;
3552
3553         if ((rx_desc->status & E1000_RXD_STAT_IPCS) &&
3554             !(rx_desc->errors & E1000_RXD_ERR_IPE)) {
3555                 /* IP Checksum Good */
3556                 mp->m_pkthdr.csum_flags |= CSUM_IP_CHECKED | CSUM_IP_VALID;
3557         }
3558
3559         if ((rx_desc->status & E1000_RXD_STAT_TCPCS) &&
3560             !(rx_desc->errors & E1000_RXD_ERR_TCPE)) {
3561                 mp->m_pkthdr.csum_flags |= CSUM_DATA_VALID |
3562                                            CSUM_PSEUDO_HDR |
3563                                            CSUM_FRAG_NOT_CHECKED;
3564                 mp->m_pkthdr.csum_data = htons(0xffff);
3565         }
3566 }
3567
3568 static void
3569 em_enable_intr(struct adapter *adapter)
3570 {
3571         uint32_t ims_mask = IMS_ENABLE_MASK;
3572
3573         lwkt_serialize_handler_enable(adapter->arpcom.ac_if.if_serializer);
3574
3575 #if 0
3576         /* XXX MSIX */
3577         if (adapter->hw.mac.type == e1000_82574) {
3578                 E1000_WRITE_REG(&adapter->hw, EM_EIAC, EM_MSIX_MASK);
3579                 ims_mask |= EM_MSIX_MASK;
3580         }
3581 #endif
3582         E1000_WRITE_REG(&adapter->hw, E1000_IMS, ims_mask);
3583 }
3584
3585 static void
3586 em_disable_intr(struct adapter *adapter)
3587 {
3588         uint32_t clear = 0xffffffff;
3589
3590         /*
3591          * The first version of 82542 had an errata where when link was forced
3592          * it would stay up even up even if the cable was disconnected.
3593          * Sequence errors were used to detect the disconnect and then the
3594          * driver would unforce the link.  This code in the in the ISR.  For
3595          * this to work correctly the Sequence error interrupt had to be
3596          * enabled all the time.
3597          */
3598         if (adapter->hw.mac.type == e1000_82542 &&
3599             adapter->hw.revision_id == E1000_REVISION_2)
3600                 clear &= ~E1000_ICR_RXSEQ;
3601         else if (adapter->hw.mac.type == e1000_82574)
3602                 E1000_WRITE_REG(&adapter->hw, EM_EIAC, 0);
3603
3604         E1000_WRITE_REG(&adapter->hw, E1000_IMC, clear);
3605
3606         adapter->npoll.ifpc_stcount = 0;
3607
3608         lwkt_serialize_handler_disable(adapter->arpcom.ac_if.if_serializer);
3609 }
3610
3611 /*
3612  * Bit of a misnomer, what this really means is
3613  * to enable OS management of the system... aka
3614  * to disable special hardware management features
3615  */
3616 static void
3617 em_get_mgmt(struct adapter *adapter)
3618 {
3619         /* A shared code workaround */
3620 #define E1000_82542_MANC2H E1000_MANC2H
3621         if (adapter->flags & EM_FLAG_HAS_MGMT) {
3622                 int manc2h = E1000_READ_REG(&adapter->hw, E1000_MANC2H);
3623                 int manc = E1000_READ_REG(&adapter->hw, E1000_MANC);
3624
3625                 /* disable hardware interception of ARP */
3626                 manc &= ~(E1000_MANC_ARP_EN);
3627
3628                 /* enable receiving management packets to the host */
3629                 if (adapter->hw.mac.type >= e1000_82571) {
3630                         manc |= E1000_MANC_EN_MNG2HOST;
3631 #define E1000_MNG2HOST_PORT_623 (1 << 5)
3632 #define E1000_MNG2HOST_PORT_664 (1 << 6)
3633                         manc2h |= E1000_MNG2HOST_PORT_623;
3634                         manc2h |= E1000_MNG2HOST_PORT_664;
3635                         E1000_WRITE_REG(&adapter->hw, E1000_MANC2H, manc2h);
3636                 }
3637
3638                 E1000_WRITE_REG(&adapter->hw, E1000_MANC, manc);
3639         }
3640 }
3641
3642 /*
3643  * Give control back to hardware management
3644  * controller if there is one.
3645  */
3646 static void
3647 em_rel_mgmt(struct adapter *adapter)
3648 {
3649         if (adapter->flags & EM_FLAG_HAS_MGMT) {
3650                 int manc = E1000_READ_REG(&adapter->hw, E1000_MANC);
3651
3652                 /* re-enable hardware interception of ARP */
3653                 manc |= E1000_MANC_ARP_EN;
3654
3655                 if (adapter->hw.mac.type >= e1000_82571)
3656                         manc &= ~E1000_MANC_EN_MNG2HOST;
3657
3658                 E1000_WRITE_REG(&adapter->hw, E1000_MANC, manc);
3659         }
3660 }
3661
3662 /*
3663  * em_get_hw_control() sets {CTRL_EXT|FWSM}:DRV_LOAD bit.
3664  * For ASF and Pass Through versions of f/w this means that
3665  * the driver is loaded.  For AMT version (only with 82573)
3666  * of the f/w this means that the network i/f is open.
3667  */
3668 static void
3669 em_get_hw_control(struct adapter *adapter)
3670 {
3671         /* Let firmware know the driver has taken over */
3672         if (adapter->hw.mac.type == e1000_82573) {
3673                 uint32_t swsm;
3674
3675                 swsm = E1000_READ_REG(&adapter->hw, E1000_SWSM);
3676                 E1000_WRITE_REG(&adapter->hw, E1000_SWSM,
3677                     swsm | E1000_SWSM_DRV_LOAD);
3678         } else {
3679                 uint32_t ctrl_ext;
3680
3681                 ctrl_ext = E1000_READ_REG(&adapter->hw, E1000_CTRL_EXT);
3682                 E1000_WRITE_REG(&adapter->hw, E1000_CTRL_EXT,
3683                     ctrl_ext | E1000_CTRL_EXT_DRV_LOAD);
3684         }
3685         adapter->flags |= EM_FLAG_HW_CTRL;
3686 }
3687
3688 /*
3689  * em_rel_hw_control() resets {CTRL_EXT|FWSM}:DRV_LOAD bit.
3690  * For ASF and Pass Through versions of f/w this means that the
3691  * driver is no longer loaded.  For AMT version (only with 82573)
3692  * of the f/w this means that the network i/f is closed.
3693  */
3694 static void
3695 em_rel_hw_control(struct adapter *adapter)
3696 {
3697         if ((adapter->flags & EM_FLAG_HW_CTRL) == 0)
3698                 return;
3699         adapter->flags &= ~EM_FLAG_HW_CTRL;
3700
3701         /* Let firmware taken over control of h/w */
3702         if (adapter->hw.mac.type == e1000_82573) {
3703                 uint32_t swsm;
3704
3705                 swsm = E1000_READ_REG(&adapter->hw, E1000_SWSM);
3706                 E1000_WRITE_REG(&adapter->hw, E1000_SWSM,
3707                     swsm & ~E1000_SWSM_DRV_LOAD);
3708         } else {
3709                 uint32_t ctrl_ext;
3710
3711                 ctrl_ext = E1000_READ_REG(&adapter->hw, E1000_CTRL_EXT);
3712                 E1000_WRITE_REG(&adapter->hw, E1000_CTRL_EXT,
3713                     ctrl_ext & ~E1000_CTRL_EXT_DRV_LOAD);
3714         }
3715 }
3716
3717 static int
3718 em_is_valid_eaddr(const uint8_t *addr)
3719 {
3720         char zero_addr[ETHER_ADDR_LEN] = { 0, 0, 0, 0, 0, 0 };
3721
3722         if ((addr[0] & 1) || !bcmp(addr, zero_addr, ETHER_ADDR_LEN))
3723                 return (FALSE);
3724
3725         return (TRUE);
3726 }
3727
3728 /*
3729  * Enable PCI Wake On Lan capability
3730  */
3731 void
3732 em_enable_wol(device_t dev)
3733 {
3734         uint16_t cap, status;
3735         uint8_t id;
3736
3737         /* First find the capabilities pointer*/
3738         cap = pci_read_config(dev, PCIR_CAP_PTR, 2);
3739
3740         /* Read the PM Capabilities */
3741         id = pci_read_config(dev, cap, 1);
3742         if (id != PCIY_PMG)     /* Something wrong */
3743                 return;
3744
3745         /*
3746          * OK, we have the power capabilities,
3747          * so now get the status register
3748          */
3749         cap += PCIR_POWER_STATUS;
3750         status = pci_read_config(dev, cap, 2);
3751         status |= PCIM_PSTAT_PME | PCIM_PSTAT_PMEENABLE;
3752         pci_write_config(dev, cap, status, 2);
3753 }
3754
3755
3756 /*
3757  * 82544 Coexistence issue workaround.
3758  *    There are 2 issues.
3759  *       1. Transmit Hang issue.
3760  *    To detect this issue, following equation can be used...
3761  *        SIZE[3:0] + ADDR[2:0] = SUM[3:0].
3762  *        If SUM[3:0] is in between 1 to 4, we will have this issue.
3763  *
3764  *       2. DAC issue.
3765  *    To detect this issue, following equation can be used...
3766  *        SIZE[3:0] + ADDR[2:0] = SUM[3:0].
3767  *        If SUM[3:0] is in between 9 to c, we will have this issue.
3768  *
3769  *    WORKAROUND:
3770  *        Make sure we do not have ending address
3771  *        as 1,2,3,4(Hang) or 9,a,b,c (DAC)
3772  */
3773 static uint32_t
3774 em_82544_fill_desc(bus_addr_t address, uint32_t length, PDESC_ARRAY desc_array)
3775 {
3776         uint32_t safe_terminator;
3777
3778         /*
3779          * Since issue is sensitive to length and address.
3780          * Let us first check the address...
3781          */
3782         if (length <= 4) {
3783                 desc_array->descriptor[0].address = address;
3784                 desc_array->descriptor[0].length = length;
3785                 desc_array->elements = 1;
3786                 return (desc_array->elements);
3787         }
3788
3789         safe_terminator =
3790         (uint32_t)((((uint32_t)address & 0x7) + (length & 0xF)) & 0xF);
3791
3792         /* If it does not fall between 0x1 to 0x4 and 0x9 to 0xC then return */
3793         if (safe_terminator == 0 ||
3794             (safe_terminator > 4 && safe_terminator < 9) ||
3795             (safe_terminator > 0xC && safe_terminator <= 0xF)) {
3796                 desc_array->descriptor[0].address = address;
3797                 desc_array->descriptor[0].length = length;
3798                 desc_array->elements = 1;
3799                 return (desc_array->elements);
3800         }
3801
3802         desc_array->descriptor[0].address = address;
3803         desc_array->descriptor[0].length = length - 4;
3804         desc_array->descriptor[1].address = address + (length - 4);
3805         desc_array->descriptor[1].length = 4;
3806         desc_array->elements = 2;
3807         return (desc_array->elements);
3808 }
3809
3810 static void
3811 em_update_stats(struct adapter *adapter)
3812 {
3813         struct ifnet *ifp = &adapter->arpcom.ac_if;
3814
3815         if (adapter->hw.phy.media_type == e1000_media_type_copper ||
3816             (E1000_READ_REG(&adapter->hw, E1000_STATUS) & E1000_STATUS_LU)) {
3817                 adapter->stats.symerrs +=
3818                         E1000_READ_REG(&adapter->hw, E1000_SYMERRS);
3819                 adapter->stats.sec += E1000_READ_REG(&adapter->hw, E1000_SEC);
3820         }
3821         adapter->stats.crcerrs += E1000_READ_REG(&adapter->hw, E1000_CRCERRS);
3822         adapter->stats.mpc += E1000_READ_REG(&adapter->hw, E1000_MPC);
3823         adapter->stats.scc += E1000_READ_REG(&adapter->hw, E1000_SCC);
3824         adapter->stats.ecol += E1000_READ_REG(&adapter->hw, E1000_ECOL);
3825
3826         adapter->stats.mcc += E1000_READ_REG(&adapter->hw, E1000_MCC);
3827         adapter->stats.latecol += E1000_READ_REG(&adapter->hw, E1000_LATECOL);
3828         adapter->stats.colc += E1000_READ_REG(&adapter->hw, E1000_COLC);
3829         adapter->stats.dc += E1000_READ_REG(&adapter->hw, E1000_DC);
3830         adapter->stats.rlec += E1000_READ_REG(&adapter->hw, E1000_RLEC);
3831         adapter->stats.xonrxc += E1000_READ_REG(&adapter->hw, E1000_XONRXC);
3832         adapter->stats.xontxc += E1000_READ_REG(&adapter->hw, E1000_XONTXC);
3833         adapter->stats.xoffrxc += E1000_READ_REG(&adapter->hw, E1000_XOFFRXC);
3834         adapter->stats.xofftxc += E1000_READ_REG(&adapter->hw, E1000_XOFFTXC);
3835         adapter->stats.fcruc += E1000_READ_REG(&adapter->hw, E1000_FCRUC);
3836         adapter->stats.prc64 += E1000_READ_REG(&adapter->hw, E1000_PRC64);
3837         adapter->stats.prc127 += E1000_READ_REG(&adapter->hw, E1000_PRC127);
3838         adapter->stats.prc255 += E1000_READ_REG(&adapter->hw, E1000_PRC255);
3839         adapter->stats.prc511 += E1000_READ_REG(&adapter->hw, E1000_PRC511);
3840         adapter->stats.prc1023 += E1000_READ_REG(&adapter->hw, E1000_PRC1023);
3841         adapter->stats.prc1522 += E1000_READ_REG(&adapter->hw, E1000_PRC1522);
3842         adapter->stats.gprc += E1000_READ_REG(&adapter->hw, E1000_GPRC);
3843         adapter->stats.bprc += E1000_READ_REG(&adapter->hw, E1000_BPRC);
3844         adapter->stats.mprc += E1000_READ_REG(&adapter->hw, E1000_MPRC);
3845         adapter->stats.gptc += E1000_READ_REG(&adapter->hw, E1000_GPTC);
3846
3847         /* For the 64-bit byte counters the low dword must be read first. */
3848         /* Both registers clear on the read of the high dword */
3849
3850         adapter->stats.gorc += E1000_READ_REG(&adapter->hw, E1000_GORCH);
3851         adapter->stats.gotc += E1000_READ_REG(&adapter->hw, E1000_GOTCH);
3852
3853         adapter->stats.rnbc += E1000_READ_REG(&adapter->hw, E1000_RNBC);
3854         adapter->stats.ruc += E1000_READ_REG(&adapter->hw, E1000_RUC);
3855         adapter->stats.rfc += E1000_READ_REG(&adapter->hw, E1000_RFC);
3856         adapter->stats.roc += E1000_READ_REG(&adapter->hw, E1000_ROC);
3857         adapter->stats.rjc += E1000_READ_REG(&adapter->hw, E1000_RJC);
3858
3859         adapter->stats.tor += E1000_READ_REG(&adapter->hw, E1000_TORH);
3860         adapter->stats.tot += E1000_READ_REG(&adapter->hw, E1000_TOTH);
3861
3862         adapter->stats.tpr += E1000_READ_REG(&adapter->hw, E1000_TPR);
3863         adapter->stats.tpt += E1000_READ_REG(&adapter->hw, E1000_TPT);
3864         adapter->stats.ptc64 += E1000_READ_REG(&adapter->hw, E1000_PTC64);
3865         adapter->stats.ptc127 += E1000_READ_REG(&adapter->hw, E1000_PTC127);
3866         adapter->stats.ptc255 += E1000_READ_REG(&adapter->hw, E1000_PTC255);
3867         adapter->stats.ptc511 += E1000_READ_REG(&adapter->hw, E1000_PTC511);
3868         adapter->stats.ptc1023 += E1000_READ_REG(&adapter->hw, E1000_PTC1023);
3869         adapter->stats.ptc1522 += E1000_READ_REG(&adapter->hw, E1000_PTC1522);
3870         adapter->stats.mptc += E1000_READ_REG(&adapter->hw, E1000_MPTC);
3871         adapter->stats.bptc += E1000_READ_REG(&adapter->hw, E1000_BPTC);
3872
3873         if (adapter->hw.mac.type >= e1000_82543) {
3874                 adapter->stats.algnerrc +=
3875                 E1000_READ_REG(&adapter->hw, E1000_ALGNERRC);
3876                 adapter->stats.rxerrc +=
3877                 E1000_READ_REG(&adapter->hw, E1000_RXERRC);
3878                 adapter->stats.tncrs +=
3879                 E1000_READ_REG(&adapter->hw, E1000_TNCRS);
3880                 adapter->stats.cexterr +=
3881                 E1000_READ_REG(&adapter->hw, E1000_CEXTERR);
3882                 adapter->stats.tsctc +=
3883                 E1000_READ_REG(&adapter->hw, E1000_TSCTC);
3884                 adapter->stats.tsctfc +=
3885                 E1000_READ_REG(&adapter->hw, E1000_TSCTFC);
3886         }
3887
3888         IFNET_STAT_SET(ifp, collisions, adapter->stats.colc);
3889
3890         /* Rx Errors */
3891         IFNET_STAT_SET(ifp, ierrors,
3892             adapter->dropped_pkts + adapter->stats.rxerrc +
3893             adapter->stats.crcerrs + adapter->stats.algnerrc +
3894             adapter->stats.ruc + adapter->stats.roc +
3895             adapter->stats.mpc + adapter->stats.cexterr);
3896
3897         /* Tx Errors */
3898         IFNET_STAT_SET(ifp, oerrors,
3899             adapter->stats.ecol + adapter->stats.latecol +
3900             adapter->watchdog_events);
3901 }
3902
3903 static void
3904 em_print_debug_info(struct adapter *adapter)
3905 {
3906         device_t dev = adapter->dev;
3907         uint8_t *hw_addr = adapter->hw.hw_addr;
3908
3909         device_printf(dev, "Adapter hardware address = %p \n", hw_addr);
3910         device_printf(dev, "CTRL = 0x%x RCTL = 0x%x \n",
3911             E1000_READ_REG(&adapter->hw, E1000_CTRL),
3912             E1000_READ_REG(&adapter->hw, E1000_RCTL));
3913         device_printf(dev, "Packet buffer = Tx=%dk Rx=%dk \n",
3914             ((E1000_READ_REG(&adapter->hw, E1000_PBA) & 0xffff0000) >> 16),\
3915             (E1000_READ_REG(&adapter->hw, E1000_PBA) & 0xffff) );
3916         device_printf(dev, "Flow control watermarks high = %d low = %d\n",
3917             adapter->hw.fc.high_water,
3918             adapter->hw.fc.low_water);
3919         device_printf(dev, "tx_int_delay = %d, tx_abs_int_delay = %d\n",
3920             E1000_READ_REG(&adapter->hw, E1000_TIDV),
3921             E1000_READ_REG(&adapter->hw, E1000_TADV));
3922         device_printf(dev, "rx_int_delay = %d, rx_abs_int_delay = %d\n",
3923             E1000_READ_REG(&adapter->hw, E1000_RDTR),
3924             E1000_READ_REG(&adapter->hw, E1000_RADV));
3925         device_printf(dev, "fifo workaround = %lld, fifo_reset_count = %lld\n",
3926             (long long)adapter->tx_fifo_wrk_cnt,
3927             (long long)adapter->tx_fifo_reset_cnt);
3928         device_printf(dev, "hw tdh = %d, hw tdt = %d\n",
3929             E1000_READ_REG(&adapter->hw, E1000_TDH(0)),
3930             E1000_READ_REG(&adapter->hw, E1000_TDT(0)));
3931         device_printf(dev, "hw rdh = %d, hw rdt = %d\n",
3932             E1000_READ_REG(&adapter->hw, E1000_RDH(0)),
3933             E1000_READ_REG(&adapter->hw, E1000_RDT(0)));
3934         device_printf(dev, "Num Tx descriptors avail = %d\n",
3935             adapter->num_tx_desc_avail);
3936         device_printf(dev, "Tx Descriptors not avail1 = %ld\n",
3937             adapter->no_tx_desc_avail1);
3938         device_printf(dev, "Tx Descriptors not avail2 = %ld\n",
3939             adapter->no_tx_desc_avail2);
3940         device_printf(dev, "Std mbuf failed = %ld\n",
3941             adapter->mbuf_alloc_failed);
3942         device_printf(dev, "Std mbuf cluster failed = %ld\n",
3943             adapter->mbuf_cluster_failed);
3944         device_printf(dev, "Driver dropped packets = %ld\n",
3945             adapter->dropped_pkts);
3946         device_printf(dev, "Driver tx dma failure in encap = %ld\n",
3947             adapter->no_tx_dma_setup);
3948 }
3949
3950 static void
3951 em_print_hw_stats(struct adapter *adapter)
3952 {
3953         device_t dev = adapter->dev;
3954
3955         device_printf(dev, "Excessive collisions = %lld\n",
3956             (long long)adapter->stats.ecol);
3957 #if (DEBUG_HW > 0)  /* Dont output these errors normally */
3958         device_printf(dev, "Symbol errors = %lld\n",
3959             (long long)adapter->stats.symerrs);
3960 #endif
3961         device_printf(dev, "Sequence errors = %lld\n",
3962             (long long)adapter->stats.sec);
3963         device_printf(dev, "Defer count = %lld\n",
3964             (long long)adapter->stats.dc);
3965         device_printf(dev, "Missed Packets = %lld\n",
3966             (long long)adapter->stats.mpc);
3967         device_printf(dev, "Receive No Buffers = %lld\n",
3968             (long long)adapter->stats.rnbc);
3969         /* RLEC is inaccurate on some hardware, calculate our own. */
3970         device_printf(dev, "Receive Length Errors = %lld\n",
3971             ((long long)adapter->stats.roc + (long long)adapter->stats.ruc));
3972         device_printf(dev, "Receive errors = %lld\n",
3973             (long long)adapter->stats.rxerrc);
3974         device_printf(dev, "Crc errors = %lld\n",
3975             (long long)adapter->stats.crcerrs);
3976         device_printf(dev, "Alignment errors = %lld\n",
3977             (long long)adapter->stats.algnerrc);
3978         device_printf(dev, "Collision/Carrier extension errors = %lld\n",
3979             (long long)adapter->stats.cexterr);
3980         device_printf(dev, "RX overruns = %ld\n", adapter->rx_overruns);
3981         device_printf(dev, "watchdog timeouts = %ld\n",
3982             adapter->watchdog_events);
3983         device_printf(dev, "XON Rcvd = %lld\n",
3984             (long long)adapter->stats.xonrxc);
3985         device_printf(dev, "XON Xmtd = %lld\n",
3986             (long long)adapter->stats.xontxc);
3987         device_printf(dev, "XOFF Rcvd = %lld\n",
3988             (long long)adapter->stats.xoffrxc);
3989         device_printf(dev, "XOFF Xmtd = %lld\n",
3990             (long long)adapter->stats.xofftxc);
3991         device_printf(dev, "Good Packets Rcvd = %lld\n",
3992             (long long)adapter->stats.gprc);
3993         device_printf(dev, "Good Packets Xmtd = %lld\n",
3994             (long long)adapter->stats.gptc);
3995 }
3996
3997 static void
3998 em_print_nvm_info(struct adapter *adapter)
3999 {
4000         uint16_t eeprom_data;
4001         int i, j, row = 0;
4002
4003         /* Its a bit crude, but it gets the job done */
4004         kprintf("\nInterface EEPROM Dump:\n");
4005         kprintf("Offset\n0x0000  ");
4006         for (i = 0, j = 0; i < 32; i++, j++) {
4007                 if (j == 8) { /* Make the offset block */
4008                         j = 0; ++row;
4009                         kprintf("\n0x00%x0  ",row);
4010                 }
4011                 e1000_read_nvm(&adapter->hw, i, 1, &eeprom_data);
4012                 kprintf("%04x ", eeprom_data);
4013         }
4014         kprintf("\n");
4015 }
4016
4017 static int
4018 em_sysctl_debug_info(SYSCTL_HANDLER_ARGS)
4019 {
4020         struct adapter *adapter;
4021         struct ifnet *ifp;
4022         int error, result;
4023
4024         result = -1;
4025         error = sysctl_handle_int(oidp, &result, 0, req);
4026         if (error || !req->newptr)
4027                 return (error);
4028
4029         adapter = (struct adapter *)arg1;
4030         ifp = &adapter->arpcom.ac_if;
4031
4032         lwkt_serialize_enter(ifp->if_serializer);
4033
4034         if (result == 1)
4035                 em_print_debug_info(adapter);
4036
4037         /*
4038          * This value will cause a hex dump of the
4039          * first 32 16-bit words of the EEPROM to
4040          * the screen.
4041          */
4042         if (result == 2)
4043                 em_print_nvm_info(adapter);
4044
4045         lwkt_serialize_exit(ifp->if_serializer);
4046
4047         return (error);
4048 }
4049
4050 static int
4051 em_sysctl_stats(SYSCTL_HANDLER_ARGS)
4052 {
4053         int error, result;
4054
4055         result = -1;
4056         error = sysctl_handle_int(oidp, &result, 0, req);
4057         if (error || !req->newptr)
4058                 return (error);
4059
4060         if (result == 1) {
4061                 struct adapter *adapter = (struct adapter *)arg1;
4062                 struct ifnet *ifp = &adapter->arpcom.ac_if;
4063
4064                 lwkt_serialize_enter(ifp->if_serializer);
4065                 em_print_hw_stats(adapter);
4066                 lwkt_serialize_exit(ifp->if_serializer);
4067         }
4068         return (error);
4069 }
4070
4071 static void
4072 em_add_sysctl(struct adapter *adapter)
4073 {
4074         struct sysctl_ctx_list *ctx;
4075         struct sysctl_oid *tree;
4076
4077         ctx = device_get_sysctl_ctx(adapter->dev);
4078         tree = device_get_sysctl_tree(adapter->dev);
4079         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree),
4080             OID_AUTO, "debug", CTLTYPE_INT|CTLFLAG_RW, adapter, 0,
4081             em_sysctl_debug_info, "I", "Debug Information");
4082
4083         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree),
4084             OID_AUTO, "stats", CTLTYPE_INT|CTLFLAG_RW, adapter, 0,
4085             em_sysctl_stats, "I", "Statistics");
4086
4087         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree),
4088             OID_AUTO, "rxd", CTLFLAG_RD,
4089             &adapter->num_rx_desc, 0, NULL);
4090         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree),
4091             OID_AUTO, "txd", CTLFLAG_RD,
4092             &adapter->num_tx_desc, 0, NULL);
4093
4094         if (adapter->hw.mac.type >= e1000_82540) {
4095                 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree),
4096                     OID_AUTO, "int_throttle_ceil",
4097                     CTLTYPE_INT|CTLFLAG_RW, adapter, 0,
4098                     em_sysctl_int_throttle, "I",
4099                     "interrupt throttling rate");
4100         }
4101         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree),
4102             OID_AUTO, "int_tx_nsegs",
4103             CTLTYPE_INT|CTLFLAG_RW, adapter, 0,
4104             em_sysctl_int_tx_nsegs, "I",
4105             "# segments per TX interrupt");
4106         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree),
4107             OID_AUTO, "wreg_tx_nsegs", CTLFLAG_RW,
4108             &adapter->tx_wreg_nsegs, 0,
4109             "# segments before write to hardware register");
4110 }
4111
4112 static int
4113 em_sysctl_int_throttle(SYSCTL_HANDLER_ARGS)
4114 {
4115         struct adapter *adapter = (void *)arg1;
4116         struct ifnet *ifp = &adapter->arpcom.ac_if;
4117         int error, throttle;
4118
4119         throttle = adapter->int_throttle_ceil;
4120         error = sysctl_handle_int(oidp, &throttle, 0, req);
4121         if (error || req->newptr == NULL)
4122                 return error;
4123         if (throttle < 0 || throttle > 1000000000 / 256)
4124                 return EINVAL;
4125
4126         if (throttle) {
4127                 /*
4128                  * Set the interrupt throttling rate in 256ns increments,
4129                  * recalculate sysctl value assignment to get exact frequency.
4130                  */
4131                 throttle = 1000000000 / 256 / throttle;
4132
4133                 /* Upper 16bits of ITR is reserved and should be zero */
4134                 if (throttle & 0xffff0000)
4135                         return EINVAL;
4136         }
4137
4138         lwkt_serialize_enter(ifp->if_serializer);
4139
4140         if (throttle)
4141                 adapter->int_throttle_ceil = 1000000000 / 256 / throttle;
4142         else
4143                 adapter->int_throttle_ceil = 0;
4144
4145         if (ifp->if_flags & IFF_RUNNING)
4146                 em_set_itr(adapter, throttle);
4147
4148         lwkt_serialize_exit(ifp->if_serializer);
4149
4150         if (bootverbose) {
4151                 if_printf(ifp, "Interrupt moderation set to %d/sec\n",
4152                           adapter->int_throttle_ceil);
4153         }
4154         return 0;
4155 }
4156
4157 static int
4158 em_sysctl_int_tx_nsegs(SYSCTL_HANDLER_ARGS)
4159 {
4160         struct adapter *adapter = (void *)arg1;
4161         struct ifnet *ifp = &adapter->arpcom.ac_if;
4162         int error, segs;
4163
4164         segs = adapter->tx_int_nsegs;
4165         error = sysctl_handle_int(oidp, &segs, 0, req);
4166         if (error || req->newptr == NULL)
4167                 return error;
4168         if (segs <= 0)
4169                 return EINVAL;
4170
4171         lwkt_serialize_enter(ifp->if_serializer);
4172
4173         /*
4174          * Don't allow int_tx_nsegs to become:
4175          * o  Less the oact_tx_desc
4176          * o  Too large that no TX desc will cause TX interrupt to
4177          *    be generated (OACTIVE will never recover)
4178          * o  Too small that will cause tx_dd[] overflow
4179          */
4180         if (segs < adapter->oact_tx_desc ||
4181             segs >= adapter->num_tx_desc - adapter->oact_tx_desc ||
4182             segs < adapter->num_tx_desc / EM_TXDD_SAFE) {
4183                 error = EINVAL;
4184         } else {
4185                 error = 0;
4186                 adapter->tx_int_nsegs = segs;
4187         }
4188
4189         lwkt_serialize_exit(ifp->if_serializer);
4190
4191         return error;
4192 }
4193
4194 static void
4195 em_set_itr(struct adapter *adapter, uint32_t itr)
4196 {
4197         E1000_WRITE_REG(&adapter->hw, E1000_ITR, itr);
4198         if (adapter->hw.mac.type == e1000_82574) {
4199                 int i;
4200
4201                 /*
4202                  * When using MSIX interrupts we need to
4203                  * throttle using the EITR register
4204                  */
4205                 for (i = 0; i < 4; ++i) {
4206                         E1000_WRITE_REG(&adapter->hw,
4207                             E1000_EITR_82574(i), itr);
4208                 }
4209         }
4210 }
4211
4212 static void
4213 em_disable_aspm(struct adapter *adapter)
4214 {
4215         uint16_t link_cap, link_ctrl, disable;
4216         uint8_t pcie_ptr, reg;
4217         device_t dev = adapter->dev;
4218
4219         switch (adapter->hw.mac.type) {
4220         case e1000_82571:
4221         case e1000_82572:
4222         case e1000_82573:
4223                 /*
4224                  * 82573 specification update
4225                  * errata #8 disable L0s
4226                  * errata #41 disable L1
4227                  *
4228                  * 82571/82572 specification update
4229                  # errata #13 disable L1
4230                  * errata #68 disable L0s
4231                  */
4232                 disable = PCIEM_LNKCTL_ASPM_L0S | PCIEM_LNKCTL_ASPM_L1;
4233                 break;
4234
4235         case e1000_82574:
4236         case e1000_82583:
4237                 /*
4238                  * 82574 specification update errata #20
4239                  * 82583 specification update errata #9
4240                  *
4241                  * There is no need to disable L1
4242                  */
4243                 disable = PCIEM_LNKCTL_ASPM_L0S;
4244                 break;
4245
4246         default:
4247                 return;
4248         }
4249
4250         pcie_ptr = pci_get_pciecap_ptr(dev);
4251         if (pcie_ptr == 0)
4252                 return;
4253
4254         link_cap = pci_read_config(dev, pcie_ptr + PCIER_LINKCAP, 2);
4255         if ((link_cap & PCIEM_LNKCAP_ASPM_MASK) == 0)
4256                 return;
4257
4258         if (bootverbose) {
4259                 if_printf(&adapter->arpcom.ac_if,
4260                     "disable ASPM %#02x\n", disable);
4261         }
4262
4263         reg = pcie_ptr + PCIER_LINKCTRL;
4264         link_ctrl = pci_read_config(dev, reg, 2);
4265         link_ctrl &= ~disable;
4266         pci_write_config(dev, reg, link_ctrl, 2);
4267 }
4268
4269 static int
4270 em_tso_pullup(struct adapter *adapter, struct mbuf **mp)
4271 {
4272         int iphlen, hoff, thoff, ex = 0;
4273         struct mbuf *m;
4274         struct ip *ip;
4275
4276         m = *mp;
4277         KASSERT(M_WRITABLE(m), ("TSO mbuf not writable"));
4278
4279         iphlen = m->m_pkthdr.csum_iphlen;
4280         thoff = m->m_pkthdr.csum_thlen;
4281         hoff = m->m_pkthdr.csum_lhlen;
4282
4283         KASSERT(iphlen > 0, ("invalid ip hlen"));
4284         KASSERT(thoff > 0, ("invalid tcp hlen"));
4285         KASSERT(hoff > 0, ("invalid ether hlen"));
4286
4287         if (adapter->flags & EM_FLAG_TSO_PULLEX)
4288                 ex = 4;
4289
4290         if (m->m_len < hoff + iphlen + thoff + ex) {
4291                 m = m_pullup(m, hoff + iphlen + thoff + ex);
4292                 if (m == NULL) {
4293                         *mp = NULL;
4294                         return ENOBUFS;
4295                 }
4296                 *mp = m;
4297         }
4298         ip = mtodoff(m, struct ip *, hoff);
4299         ip->ip_len = 0;
4300
4301         return 0;
4302 }
4303
4304 static int
4305 em_tso_setup(struct adapter *adapter, struct mbuf *mp,
4306     uint32_t *txd_upper, uint32_t *txd_lower)
4307 {
4308         struct e1000_context_desc *TXD;
4309         int hoff, iphlen, thoff, hlen;
4310         int mss, pktlen, curr_txd;
4311
4312         iphlen = mp->m_pkthdr.csum_iphlen;
4313         thoff = mp->m_pkthdr.csum_thlen;
4314         hoff = mp->m_pkthdr.csum_lhlen;
4315         mss = mp->m_pkthdr.tso_segsz;
4316         pktlen = mp->m_pkthdr.len;
4317
4318         if (adapter->csum_flags == CSUM_TSO &&
4319             adapter->csum_iphlen == iphlen &&
4320             adapter->csum_lhlen == hoff &&
4321             adapter->csum_thlen == thoff &&
4322             adapter->csum_mss == mss &&
4323             adapter->csum_pktlen == pktlen) {
4324                 *txd_upper = adapter->csum_txd_upper;
4325                 *txd_lower = adapter->csum_txd_lower;
4326                 return 0;
4327         }
4328         hlen = hoff + iphlen + thoff;
4329
4330         /*
4331          * Setup a new TSO context.
4332          */
4333
4334         curr_txd = adapter->next_avail_tx_desc;
4335         TXD = (struct e1000_context_desc *)&adapter->tx_desc_base[curr_txd];
4336
4337         *txd_lower = E1000_TXD_CMD_DEXT |       /* Extended descr type */
4338                      E1000_TXD_DTYP_D |         /* Data descr type */
4339                      E1000_TXD_CMD_TSE;         /* Do TSE on this packet */
4340
4341         /* IP and/or TCP header checksum calculation and insertion. */
4342         *txd_upper = (E1000_TXD_POPTS_IXSM | E1000_TXD_POPTS_TXSM) << 8;
4343
4344         /*
4345          * Start offset for header checksum calculation.
4346          * End offset for header checksum calculation.
4347          * Offset of place put the checksum.
4348          */
4349         TXD->lower_setup.ip_fields.ipcss = hoff;
4350         TXD->lower_setup.ip_fields.ipcse = htole16(hoff + iphlen - 1);
4351         TXD->lower_setup.ip_fields.ipcso = hoff + offsetof(struct ip, ip_sum);
4352
4353         /*
4354          * Start offset for payload checksum calculation.
4355          * End offset for payload checksum calculation.
4356          * Offset of place to put the checksum.
4357          */
4358         TXD->upper_setup.tcp_fields.tucss = hoff + iphlen;
4359         TXD->upper_setup.tcp_fields.tucse = 0;
4360         TXD->upper_setup.tcp_fields.tucso =
4361             hoff + iphlen + offsetof(struct tcphdr, th_sum);
4362
4363         /*
4364          * Payload size per packet w/o any headers.
4365          * Length of all headers up to payload.
4366          */
4367         TXD->tcp_seg_setup.fields.mss = htole16(mss);
4368         TXD->tcp_seg_setup.fields.hdr_len = hlen;
4369         TXD->cmd_and_length = htole32(E1000_TXD_CMD_IFCS |
4370                                 E1000_TXD_CMD_DEXT |    /* Extended descr */
4371                                 E1000_TXD_CMD_TSE |     /* TSE context */
4372                                 E1000_TXD_CMD_IP |      /* Do IP csum */
4373                                 E1000_TXD_CMD_TCP |     /* Do TCP checksum */
4374                                 (pktlen - hlen));       /* Total len */
4375
4376         /* Save the information for this TSO context */
4377         adapter->csum_flags = CSUM_TSO;
4378         adapter->csum_lhlen = hoff;
4379         adapter->csum_iphlen = iphlen;
4380         adapter->csum_thlen = thoff;
4381         adapter->csum_mss = mss;
4382         adapter->csum_pktlen = pktlen;
4383         adapter->csum_txd_upper = *txd_upper;
4384         adapter->csum_txd_lower = *txd_lower;
4385
4386         if (++curr_txd == adapter->num_tx_desc)
4387                 curr_txd = 0;
4388
4389         KKASSERT(adapter->num_tx_desc_avail > 0);
4390         adapter->num_tx_desc_avail--;
4391
4392         adapter->next_avail_tx_desc = curr_txd;
4393         return 1;
4394 }