sys/dev/crypto/safe/safe.c

   1 /*-
   2  * Copyright (c) 2003 Sam Leffler, Errno Consulting
   3  * Copyright (c) 2003 Global Technology Associates, Inc.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/sys/dev/safe/safe.c,v 1.22 2011/06/12 23:33:08 delphij Exp $
  28  */
  29
  30 /*
  31  * SafeNet SafeXcel-1141 hardware crypto accelerator
  32  */
  33 #include "opt_safe.h"
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/proc.h>
  38 #include <sys/errno.h>
  39 #include <sys/malloc.h>
  40 #include <sys/kernel.h>
  41 #include <sys/mbuf.h>
  42 #include <sys/module.h>
  43 #include <sys/lock.h>
  44 #include <sys/sysctl.h>
  45 #include <sys/endian.h>
  46
  47 #include <vm/vm.h>
  48 #include <vm/pmap.h>
  49
  50 #include <sys/bus.h>
  51 #include <sys/rman.h>
  52
  53 #include <crypto/sha1.h>
  54 #include <opencrypto/cryptodev.h>
  55 #include <opencrypto/cryptosoft.h>
  56 #include <sys/md5.h>
  57 #include <sys/random.h>
  58 #include <sys/kobj.h>
  59
  60 #include "cryptodev_if.h"
  61
  62 #include <bus/pci/pcivar.h>
  63 #include <bus/pci/pcireg.h>
  64
  65 #ifdef SAFE_RNDTEST
  66 #include <dev/crypto/rndtest/rndtest.h>
  67 #endif
  68 #include <dev/crypto/safe/safereg.h>
  69 #include <dev/crypto/safe/safevar.h>
  70
  71 #ifndef bswap32
  72 #define bswap32 NTOHL
  73 #endif
  74
  75 /*
  76  * Prototypes and count for the pci_device structure
  77  */
  78 static  int safe_probe(device_t);
  79 static  int safe_attach(device_t);
  80 static  int safe_detach(device_t);
  81 static  int safe_suspend(device_t);
  82 static  int safe_resume(device_t);
  83 static  int safe_shutdown(device_t);
  84
  85 static  int safe_newsession(device_t, u_int32_t *, struct cryptoini *);
  86 static  int safe_freesession(device_t, u_int64_t);
  87 static  int safe_process(device_t, struct cryptop *, int);
  88
  89 static device_method_t safe_methods[] = {
  90         /* Device interface */
  91         DEVMETHOD(device_probe,         safe_probe),
  92         DEVMETHOD(device_attach,        safe_attach),
  93         DEVMETHOD(device_detach,        safe_detach),
  94         DEVMETHOD(device_suspend,       safe_suspend),
  95         DEVMETHOD(device_resume,        safe_resume),
  96         DEVMETHOD(device_shutdown,      safe_shutdown),
  97
  98         /* bus interface */
  99         DEVMETHOD(bus_print_child,      bus_generic_print_child),
 100         DEVMETHOD(bus_driver_added,     bus_generic_driver_added),
 101
 102         /* crypto device methods */
 103         DEVMETHOD(cryptodev_newsession, safe_newsession),
 104         DEVMETHOD(cryptodev_freesession,safe_freesession),
 105         DEVMETHOD(cryptodev_process,    safe_process),
 106
 107         DEVMETHOD_END
 108 };
 109 static driver_t safe_driver = {
 110         "safe",
 111         safe_methods,
 112         sizeof (struct safe_softc)
 113 };
 114 static devclass_t safe_devclass;
 115
 116 DRIVER_MODULE(safe, pci, safe_driver, safe_devclass, NULL, NULL);
 117 MODULE_DEPEND(safe, crypto, 1, 1, 1);
 118 #ifdef SAFE_RNDTEST
 119 MODULE_DEPEND(safe, rndtest, 1, 1, 1);
 120 #endif
 121
 122 static  void safe_intr(void *);
 123 static  void safe_callback(struct safe_softc *, struct safe_ringentry *);
 124 static  void safe_feed(struct safe_softc *, struct safe_ringentry *);
 125 static  void safe_mcopy(struct mbuf *, struct mbuf *, u_int);
 126 #ifndef SAFE_NO_RNG
 127 static  void safe_rng_init(struct safe_softc *);
 128 static  void safe_rng(void *);
 129 #endif /* SAFE_NO_RNG */
 130 static  int safe_dma_malloc(struct safe_softc *, bus_size_t,
 131                 struct safe_dma_alloc *, int);
 132 #define safe_dma_sync(_dma, _flags) \
 133         bus_dmamap_sync((_dma)->dma_tag, (_dma)->dma_map, (_flags))
 134 static  void safe_dma_free(struct safe_softc *, struct safe_dma_alloc *);
 135 static  int safe_dmamap_aligned(const struct safe_operand *);
 136 static  int safe_dmamap_uniform(const struct safe_operand *);
 137
 138 static  void safe_reset_board(struct safe_softc *);
 139 static  void safe_init_board(struct safe_softc *);
 140 static  void safe_init_pciregs(device_t dev);
 141 static  void safe_cleanchip(struct safe_softc *);
 142 static  void safe_totalreset(struct safe_softc *);
 143
 144 static  int safe_free_entry(struct safe_softc *, struct safe_ringentry *);
 145
 146 SYSCTL_NODE(_hw, OID_AUTO, safe, CTLFLAG_RD, 0, "SafeNet driver parameters");
 147
 148 #ifdef SAFE_DEBUG
 149 static  void safe_dump_dmastatus(struct safe_softc *, const char *);
 150 static  void safe_dump_ringstate(struct safe_softc *, const char *);
 151 static  void safe_dump_intrstate(struct safe_softc *, const char *);
 152 static  void safe_dump_request(struct safe_softc *, const char *,
 153                 struct safe_ringentry *);
 154
 155 static  struct safe_softc *safec;               /* for use by hw.safe.dump */
 156
 157 static  int safe_debug = 0;
 158 SYSCTL_INT(_hw_safe, OID_AUTO, debug, CTLFLAG_RW, &safe_debug,
 159             0, "control debugging msgs");
 160 #define DPRINTF(_x)     if (safe_debug) kprintf _x
 161 #else
 162 #define DPRINTF(_x)
 163 #endif
 164
 165 #define READ_REG(sc,r) \
 166         bus_space_read_4((sc)->sc_st, (sc)->sc_sh, (r))
 167
 168 #define WRITE_REG(sc,reg,val) \
 169         bus_space_write_4((sc)->sc_st, (sc)->sc_sh, reg, val)
 170
 171 struct safe_stats safestats;
 172 SYSCTL_STRUCT(_hw_safe, OID_AUTO, stats, CTLFLAG_RD, &safestats,
 173             safe_stats, "driver statistics");
 174 #ifndef SAFE_NO_RNG
 175 static  int safe_rnginterval = 1;               /* poll once a second */
 176 SYSCTL_INT(_hw_safe, OID_AUTO, rnginterval, CTLFLAG_RW, &safe_rnginterval,
 177             0, "RNG polling interval (secs)");
 178 static  int safe_rngbufsize = 16;               /* 64 bytes each poll  */
 179 SYSCTL_INT(_hw_safe, OID_AUTO, rngbufsize, CTLFLAG_RW, &safe_rngbufsize,
 180             0, "RNG polling buffer size (32-bit words)");
 181 static  int safe_rngmaxalarm = 8;               /* max alarms before reset */
 182 SYSCTL_INT(_hw_safe, OID_AUTO, rngmaxalarm, CTLFLAG_RW, &safe_rngmaxalarm,
 183             0, "RNG max alarms before reset");
 184 #endif /* SAFE_NO_RNG */
 185
 186 static int
 187 safe_probe(device_t dev)
 188 {
 189         if (pci_get_vendor(dev) == PCI_VENDOR_SAFENET &&
 190             pci_get_device(dev) == PCI_PRODUCT_SAFEXCEL)
 191                 return (BUS_PROBE_DEFAULT);
 192         return (ENXIO);
 193 }
 194
 195 static const char*
 196 safe_partname(struct safe_softc *sc)
 197 {
 198         /* XXX sprintf numbers when not decoded */
 199         switch (pci_get_vendor(sc->sc_dev)) {
 200         case PCI_VENDOR_SAFENET:
 201                 switch (pci_get_device(sc->sc_dev)) {
 202                 case PCI_PRODUCT_SAFEXCEL: return "SafeNet SafeXcel-1141";
 203                 }
 204                 return "SafeNet unknown-part";
 205         }
 206         return "Unknown-vendor unknown-part";
 207 }
 208
 209 #ifndef SAFE_NO_RNG
 210 static void
 211 default_harvest(struct rndtest_state *rsp, void *buf, u_int count)
 212 {
 213         add_buffer_randomness_src(buf, count, RAND_SRC_SAFE);
 214 }
 215 #endif /* SAFE_NO_RNG */
 216
 217 static int
 218 safe_attach(device_t dev)
 219 {
 220         struct safe_softc *sc = device_get_softc(dev);
 221         u_int32_t raddr;
 222         u_int32_t cmd, i, devinfo;
 223         int rid;
 224
 225         bzero(sc, sizeof (*sc));
 226         sc->sc_dev = dev;
 227
 228         /* XXX handle power management */
 229
 230         cmd = pci_read_config(dev, PCIR_COMMAND, 4);
 231         cmd |= PCIM_CMD_MEMEN | PCIM_CMD_BUSMASTEREN;
 232         pci_write_config(dev, PCIR_COMMAND, cmd, 4);
 233         cmd = pci_read_config(dev, PCIR_COMMAND, 4);
 234
 235         if (!(cmd & PCIM_CMD_MEMEN)) {
 236                 device_printf(dev, "failed to enable memory mapping\n");
 237                 goto bad;
 238         }
 239
 240         if (!(cmd & PCIM_CMD_BUSMASTEREN)) {
 241                 device_printf(dev, "failed to enable bus mastering\n");
 242                 goto bad;
 243         }
 244
 245         /*
 246          * Setup memory-mapping of PCI registers.
 247          */
 248         rid = BS_BAR;
 249         sc->sc_sr = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
 250                                            RF_ACTIVE);
 251         if (sc->sc_sr == NULL) {
 252                 device_printf(dev, "cannot map register space\n");
 253                 goto bad;
 254         }
 255         sc->sc_st = rman_get_bustag(sc->sc_sr);
 256         sc->sc_sh = rman_get_bushandle(sc->sc_sr);
 257
 258         /*
 259          * Arrange interrupt line.
 260          */
 261         rid = 0;
 262         sc->sc_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
 263                                             RF_SHAREABLE|RF_ACTIVE);
 264         if (sc->sc_irq == NULL) {
 265                 device_printf(dev, "could not map interrupt\n");
 266                 goto bad1;
 267         }
 268         /*
 269          * NB: Network code assumes we are blocked with splimp()
 270          *     so make sure the IRQ is mapped appropriately.
 271          */
 272         if (bus_setup_intr(dev, sc->sc_irq, INTR_MPSAFE,
 273                            safe_intr, sc, &sc->sc_ih, NULL)) {
 274                 device_printf(dev, "could not establish interrupt\n");
 275                 goto bad2;
 276         }
 277
 278         sc->sc_cid = crypto_get_driverid(dev, CRYPTOCAP_F_HARDWARE);
 279         if (sc->sc_cid < 0) {
 280                 device_printf(dev, "could not get crypto driver id\n");
 281                 goto bad3;
 282         }
 283
 284         sc->sc_chiprev = READ_REG(sc, SAFE_DEVINFO) &
 285                 (SAFE_DEVINFO_REV_MAJ | SAFE_DEVINFO_REV_MIN);
 286
 287         /*
 288          * Setup DMA descriptor area.
 289          */
 290         if (bus_dma_tag_create(NULL,                    /* parent */
 291                                1,                       /* alignment */
 292                                SAFE_DMA_BOUNDARY,       /* boundary */
 293                                BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
 294                                BUS_SPACE_MAXADDR,       /* highaddr */
 295                                NULL, NULL,              /* filter, filterarg */
 296                                SAFE_MAX_DMA,            /* maxsize */
 297                                SAFE_MAX_PART,           /* nsegments */
 298                                SAFE_MAX_SSIZE,          /* maxsegsize */
 299                                BUS_DMA_ALLOCNOW,        /* flags */
 300                                &sc->sc_srcdmat)) {
 301                 device_printf(dev, "cannot allocate DMA tag\n");
 302                 goto bad4;
 303         }
 304         if (bus_dma_tag_create(NULL,                    /* parent */
 305                                1,                       /* alignment */
 306                                SAFE_MAX_DSIZE,          /* boundary */
 307                                BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
 308                                BUS_SPACE_MAXADDR,       /* highaddr */
 309                                NULL, NULL,              /* filter, filterarg */
 310                                SAFE_MAX_DMA,            /* maxsize */
 311                                SAFE_MAX_PART,           /* nsegments */
 312                                SAFE_MAX_DSIZE,          /* maxsegsize */
 313                                BUS_DMA_ALLOCNOW,        /* flags */
 314                                &sc->sc_dstdmat)) {
 315                 device_printf(dev, "cannot allocate DMA tag\n");
 316                 goto bad4;
 317         }
 318
 319         /*
 320          * Allocate packet engine descriptors.
 321          */
 322         if (safe_dma_malloc(sc,
 323             SAFE_MAX_NQUEUE * sizeof (struct safe_ringentry),
 324             &sc->sc_ringalloc, 0)) {
 325                 device_printf(dev, "cannot allocate PE descriptor ring\n");
 326                 bus_dma_tag_destroy(sc->sc_srcdmat);
 327                 goto bad4;
 328         }
 329         /*
 330          * Hookup the static portion of all our data structures.
 331          */
 332         sc->sc_ring = (struct safe_ringentry *) sc->sc_ringalloc.dma_vaddr;
 333         sc->sc_ringtop = sc->sc_ring + SAFE_MAX_NQUEUE;
 334         sc->sc_front = sc->sc_ring;
 335         sc->sc_back = sc->sc_ring;
 336         raddr = sc->sc_ringalloc.dma_paddr;
 337         bzero(sc->sc_ring, SAFE_MAX_NQUEUE * sizeof(struct safe_ringentry));
 338         for (i = 0; i < SAFE_MAX_NQUEUE; i++) {
 339                 struct safe_ringentry *re = &sc->sc_ring[i];
 340
 341                 re->re_desc.d_sa = raddr +
 342                         offsetof(struct safe_ringentry, re_sa);
 343                 re->re_sa.sa_staterec = raddr +
 344                         offsetof(struct safe_ringentry, re_sastate);
 345
 346                 raddr += sizeof (struct safe_ringentry);
 347         }
 348         lockinit(&sc->sc_ringlock, "packet engine ring", 0, LK_CANRECURSE);
 349
 350         /*
 351          * Allocate scatter and gather particle descriptors.
 352          */
 353         if (safe_dma_malloc(sc, SAFE_TOTAL_SPART * sizeof (struct safe_pdesc),
 354             &sc->sc_spalloc, 0)) {
 355                 device_printf(dev, "cannot allocate source particle "
 356                         "descriptor ring\n");
 357                 lockuninit(&sc->sc_ringlock);
 358                 safe_dma_free(sc, &sc->sc_ringalloc);
 359                 bus_dma_tag_destroy(sc->sc_srcdmat);
 360                 goto bad4;
 361         }
 362         sc->sc_spring = (struct safe_pdesc *) sc->sc_spalloc.dma_vaddr;
 363         sc->sc_springtop = sc->sc_spring + SAFE_TOTAL_SPART;
 364         sc->sc_spfree = sc->sc_spring;
 365         bzero(sc->sc_spring, SAFE_TOTAL_SPART * sizeof(struct safe_pdesc));
 366
 367         if (safe_dma_malloc(sc, SAFE_TOTAL_DPART * sizeof (struct safe_pdesc),
 368             &sc->sc_dpalloc, 0)) {
 369                 device_printf(dev, "cannot allocate destination particle "
 370                         "descriptor ring\n");
 371                 lockuninit(&sc->sc_ringlock);
 372                 safe_dma_free(sc, &sc->sc_spalloc);
 373                 safe_dma_free(sc, &sc->sc_ringalloc);
 374                 bus_dma_tag_destroy(sc->sc_dstdmat);
 375                 goto bad4;
 376         }
 377         sc->sc_dpring = (struct safe_pdesc *) sc->sc_dpalloc.dma_vaddr;
 378         sc->sc_dpringtop = sc->sc_dpring + SAFE_TOTAL_DPART;
 379         sc->sc_dpfree = sc->sc_dpring;
 380         bzero(sc->sc_dpring, SAFE_TOTAL_DPART * sizeof(struct safe_pdesc));
 381
 382         device_printf(sc->sc_dev, "%s", safe_partname(sc));
 383
 384         devinfo = READ_REG(sc, SAFE_DEVINFO);
 385         if (devinfo & SAFE_DEVINFO_RNG) {
 386                 sc->sc_flags |= SAFE_FLAGS_RNG;
 387                 kprintf(" rng");
 388         }
 389         if (devinfo & SAFE_DEVINFO_PKEY) {
 390 #if 0
 391                 kprintf(" key");
 392                 sc->sc_flags |= SAFE_FLAGS_KEY;
 393                 crypto_kregister(sc->sc_cid, CRK_MOD_EXP, 0);
 394                 crypto_kregister(sc->sc_cid, CRK_MOD_EXP_CRT, 0);
 395 #endif
 396         }
 397         if (devinfo & SAFE_DEVINFO_DES) {
 398                 kprintf(" des/3des");
 399                 crypto_register(sc->sc_cid, CRYPTO_3DES_CBC, 0, 0);
 400                 crypto_register(sc->sc_cid, CRYPTO_DES_CBC, 0, 0);
 401         }
 402         if (devinfo & SAFE_DEVINFO_AES) {
 403                 kprintf(" aes");
 404                 crypto_register(sc->sc_cid, CRYPTO_AES_CBC, 0, 0);
 405         }
 406         if (devinfo & SAFE_DEVINFO_MD5) {
 407                 kprintf(" md5");
 408                 crypto_register(sc->sc_cid, CRYPTO_MD5_HMAC, 0, 0);
 409         }
 410         if (devinfo & SAFE_DEVINFO_SHA1) {
 411                 kprintf(" sha1");
 412                 crypto_register(sc->sc_cid, CRYPTO_SHA1_HMAC, 0, 0);
 413         }
 414         kprintf(" null");
 415         crypto_register(sc->sc_cid, CRYPTO_NULL_CBC, 0, 0);
 416         crypto_register(sc->sc_cid, CRYPTO_NULL_HMAC, 0, 0);
 417         /* XXX other supported algorithms */
 418         kprintf("\n");
 419
 420         safe_reset_board(sc);           /* reset h/w */
 421         safe_init_pciregs(dev);         /* init pci settings */
 422         safe_init_board(sc);            /* init h/w */
 423
 424 #ifndef SAFE_NO_RNG
 425         if (sc->sc_flags & SAFE_FLAGS_RNG) {
 426 #ifdef SAFE_RNDTEST
 427                 sc->sc_rndtest = rndtest_attach(dev);
 428                 if (sc->sc_rndtest)
 429                         sc->sc_harvest = rndtest_harvest;
 430                 else
 431                         sc->sc_harvest = default_harvest;
 432 #else
 433                 sc->sc_harvest = default_harvest;
 434 #endif
 435                 safe_rng_init(sc);
 436
 437                 callout_init_mp(&sc->sc_rngto);
 438                 callout_reset(&sc->sc_rngto, hz*safe_rnginterval, safe_rng, sc);
 439         }
 440 #endif /* SAFE_NO_RNG */
 441 #ifdef SAFE_DEBUG
 442         safec = sc;                     /* for use by hw.safe.dump */
 443 #endif
 444         return (0);
 445 bad4:
 446         crypto_unregister_all(sc->sc_cid);
 447 bad3:
 448         bus_teardown_intr(dev, sc->sc_irq, sc->sc_ih);
 449 bad2:
 450         bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq);
 451 bad1:
 452         bus_release_resource(dev, SYS_RES_MEMORY, BS_BAR, sc->sc_sr);
 453 bad:
 454         return (ENXIO);
 455 }
 456
 457 /*
 458  * Detach a device that successfully probed.
 459  */
 460 static int
 461 safe_detach(device_t dev)
 462 {
 463         struct safe_softc *sc = device_get_softc(dev);
 464
 465         /* XXX wait/abort active ops */
 466
 467         WRITE_REG(sc, SAFE_HI_MASK, 0);         /* disable interrupts */
 468
 469         callout_stop(&sc->sc_rngto);
 470
 471         crypto_unregister_all(sc->sc_cid);
 472
 473 #ifdef SAFE_RNDTEST
 474         if (sc->sc_rndtest)
 475                 rndtest_detach(sc->sc_rndtest);
 476 #endif
 477
 478         safe_cleanchip(sc);
 479         safe_dma_free(sc, &sc->sc_dpalloc);
 480         safe_dma_free(sc, &sc->sc_spalloc);
 481         lockuninit(&sc->sc_ringlock);
 482         safe_dma_free(sc, &sc->sc_ringalloc);
 483
 484         bus_generic_detach(dev);
 485         bus_teardown_intr(dev, sc->sc_irq, sc->sc_ih);
 486         bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq);
 487
 488         bus_dma_tag_destroy(sc->sc_srcdmat);
 489         bus_dma_tag_destroy(sc->sc_dstdmat);
 490         bus_release_resource(dev, SYS_RES_MEMORY, BS_BAR, sc->sc_sr);
 491
 492         return (0);
 493 }
 494
 495 /*
 496  * Stop all chip i/o so that the kernel's probe routines don't
 497  * get confused by errant DMAs when rebooting.
 498  */
 499 static int
 500 safe_shutdown(device_t dev)
 501 {
 502 #ifdef notyet
 503         safe_stop(device_get_softc(dev));
 504 #endif
 505         return (0);
 506 }
 507
 508 /*
 509  * Device suspend routine.
 510  */
 511 static int
 512 safe_suspend(device_t dev)
 513 {
 514         struct safe_softc *sc = device_get_softc(dev);
 515
 516 #ifdef notyet
 517         /* XXX stop the device and save PCI settings */
 518 #endif
 519         sc->sc_suspended = 1;
 520
 521         return (0);
 522 }
 523
 524 static int
 525 safe_resume(device_t dev)
 526 {
 527         struct safe_softc *sc = device_get_softc(dev);
 528
 529 #ifdef notyet
 530         /* XXX retore PCI settings and start the device */
 531 #endif
 532         sc->sc_suspended = 0;
 533         return (0);
 534 }
 535
 536 /*
 537  * SafeXcel Interrupt routine
 538  */
 539 static void
 540 safe_intr(void *arg)
 541 {
 542         struct safe_softc *sc = arg;
 543         volatile u_int32_t stat;
 544
 545         stat = READ_REG(sc, SAFE_HM_STAT);
 546         if (stat == 0)                  /* shared irq, not for us */
 547                 return;
 548
 549         WRITE_REG(sc, SAFE_HI_CLR, stat);       /* IACK */
 550
 551         if ((stat & SAFE_INT_PE_DDONE)) {
 552                 /*
 553                  * Descriptor(s) done; scan the ring and
 554                  * process completed operations.
 555                  */
 556                 lockmgr(&sc->sc_ringlock, LK_EXCLUSIVE);
 557                 while (sc->sc_back != sc->sc_front) {
 558                         struct safe_ringentry *re = sc->sc_back;
 559 #ifdef SAFE_DEBUG
 560                         if (safe_debug) {
 561                                 safe_dump_ringstate(sc, __func__);
 562                                 safe_dump_request(sc, __func__, re);
 563                         }
 564 #endif
 565                         /*
 566                          * safe_process marks ring entries that were allocated
 567                          * but not used with a csr of zero.  This insures the
 568                          * ring front pointer never needs to be set backwards
 569                          * in the event that an entry is allocated but not used
 570                          * because of a setup error.
 571                          */
 572                         if (re->re_desc.d_csr != 0) {
 573                                 if (!SAFE_PE_CSR_IS_DONE(re->re_desc.d_csr))
 574                                         break;
 575                                 if (!SAFE_PE_LEN_IS_DONE(re->re_desc.d_len))
 576                                         break;
 577                                 sc->sc_nqchip--;
 578                                 safe_callback(sc, re);
 579                         }
 580                         if (++(sc->sc_back) == sc->sc_ringtop)
 581                                 sc->sc_back = sc->sc_ring;
 582                 }
 583                 lockmgr(&sc->sc_ringlock, LK_RELEASE);
 584         }
 585
 586         /*
 587          * Check to see if we got any DMA Error
 588          */
 589         if (stat & SAFE_INT_PE_ERROR) {
 590                 DPRINTF(("dmaerr dmastat %08x\n",
 591                         READ_REG(sc, SAFE_PE_DMASTAT)));
 592                 safestats.st_dmaerr++;
 593                 safe_totalreset(sc);
 594 #if 0
 595                 safe_feed(sc);
 596 #endif
 597         }
 598
 599         if (sc->sc_needwakeup) {                /* XXX check high watermark */
 600                 int wakeup = sc->sc_needwakeup & (CRYPTO_SYMQ|CRYPTO_ASYMQ);
 601                 DPRINTF(("%s: wakeup crypto %x\n", __func__,
 602                         sc->sc_needwakeup));
 603                 sc->sc_needwakeup &= ~wakeup;
 604                 crypto_unblock(sc->sc_cid, wakeup);
 605         }
 606 }
 607
 608 /*
 609  * safe_feed() - post a request to chip
 610  */
 611 static void
 612 safe_feed(struct safe_softc *sc, struct safe_ringentry *re)
 613 {
 614         bus_dmamap_sync(sc->sc_srcdmat, re->re_src_map, BUS_DMASYNC_PREWRITE);
 615         if (re->re_dst_map != NULL)
 616                 bus_dmamap_sync(sc->sc_dstdmat, re->re_dst_map,
 617                         BUS_DMASYNC_PREREAD);
 618         /* XXX have no smaller granularity */
 619         safe_dma_sync(&sc->sc_ringalloc,
 620                 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
 621         safe_dma_sync(&sc->sc_spalloc, BUS_DMASYNC_PREWRITE);
 622         safe_dma_sync(&sc->sc_dpalloc, BUS_DMASYNC_PREWRITE);
 623
 624 #ifdef SAFE_DEBUG
 625         if (safe_debug) {
 626                 safe_dump_ringstate(sc, __func__);
 627                 safe_dump_request(sc, __func__, re);
 628         }
 629 #endif
 630         sc->sc_nqchip++;
 631         if (sc->sc_nqchip > safestats.st_maxqchip)
 632                 safestats.st_maxqchip = sc->sc_nqchip;
 633         /* poke h/w to check descriptor ring, any value can be written */
 634         WRITE_REG(sc, SAFE_HI_RD_DESCR, 0);
 635 }
 636
 637 static void
 638 safe_setup_enckey(struct safe_session *ses, caddr_t key)
 639 {
 640         int i;
 641
 642         bcopy(key, ses->ses_key, ses->ses_klen / 8);
 643
 644         /* PE is little-endian, insure proper byte order */
 645         for (i = 0; i < nitems(ses->ses_key); i++)
 646                 ses->ses_key[i] = htole32(ses->ses_key[i]);
 647 }
 648
 649 static void
 650 safe_setup_mackey(struct safe_session *ses, int algo, caddr_t key, int klen)
 651 {
 652         MD5_CTX md5ctx;
 653         SHA1_CTX sha1ctx;
 654         int i;
 655
 656
 657         for (i = 0; i < klen; i++)
 658                 key[i] ^= HMAC_IPAD_VAL;
 659
 660         if (algo == CRYPTO_MD5_HMAC) {
 661                 MD5Init(&md5ctx);
 662                 MD5Update(&md5ctx, key, klen);
 663                 MD5Update(&md5ctx, hmac_ipad_buffer, MD5_HMAC_BLOCK_LEN - klen);
 664                 bcopy(&md5ctx.A, ses->ses_hminner, sizeof(md5ctx.A) * 4);
 665         } else {
 666                 SHA1Init(&sha1ctx);
 667                 SHA1Update(&sha1ctx, key, klen);
 668                 SHA1Update(&sha1ctx, hmac_ipad_buffer,
 669                     SHA1_HMAC_BLOCK_LEN - klen);
 670                 bcopy(sha1ctx.h.b32, ses->ses_hminner, sizeof(sha1ctx.h.b32));
 671         }
 672
 673         for (i = 0; i < klen; i++)
 674                 key[i] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
 675
 676         if (algo == CRYPTO_MD5_HMAC) {
 677                 MD5Init(&md5ctx);
 678                 MD5Update(&md5ctx, key, klen);
 679                 MD5Update(&md5ctx, hmac_opad_buffer, MD5_HMAC_BLOCK_LEN - klen);
 680                 bcopy(&md5ctx.A, ses->ses_hmouter, sizeof(md5ctx.A) * 4);
 681         } else {
 682                 SHA1Init(&sha1ctx);
 683                 SHA1Update(&sha1ctx, key, klen);
 684                 SHA1Update(&sha1ctx, hmac_opad_buffer,
 685                     SHA1_HMAC_BLOCK_LEN - klen);
 686                 bcopy(sha1ctx.h.b32, ses->ses_hmouter, sizeof(sha1ctx.h.b32));
 687         }
 688
 689         for (i = 0; i < klen; i++)
 690                 key[i] ^= HMAC_OPAD_VAL;
 691
 692         /* PE is little-endian, insure proper byte order */
 693         for (i = 0; i < nitems(ses->ses_hminner); i++) {
 694                 ses->ses_hminner[i] = htole32(ses->ses_hminner[i]);
 695                 ses->ses_hmouter[i] = htole32(ses->ses_hmouter[i]);
 696         }
 697 }
 698
 699 /*
 700  * Allocate a new 'session' and return an encoded session id.  'sidp'
 701  * contains our registration id, and should contain an encoded session
 702  * id on successful allocation.
 703  */
 704 static int
 705 safe_newsession(device_t dev, u_int32_t *sidp, struct cryptoini *cri)
 706 {
 707         struct safe_softc *sc = device_get_softc(dev);
 708         struct cryptoini *c, *encini = NULL, *macini = NULL;
 709         struct safe_session *ses = NULL;
 710         int sesn;
 711
 712         if (sidp == NULL || cri == NULL || sc == NULL)
 713                 return (EINVAL);
 714
 715         for (c = cri; c != NULL; c = c->cri_next) {
 716                 if (c->cri_alg == CRYPTO_MD5_HMAC ||
 717                     c->cri_alg == CRYPTO_SHA1_HMAC ||
 718                     c->cri_alg == CRYPTO_NULL_HMAC) {
 719                         if (macini)
 720                                 return (EINVAL);
 721                         macini = c;
 722                 } else if (c->cri_alg == CRYPTO_DES_CBC ||
 723                     c->cri_alg == CRYPTO_3DES_CBC ||
 724                     c->cri_alg == CRYPTO_AES_CBC ||
 725                     c->cri_alg == CRYPTO_NULL_CBC) {
 726                         if (encini)
 727                                 return (EINVAL);
 728                         encini = c;
 729                 } else
 730                         return (EINVAL);
 731         }
 732         if (encini == NULL && macini == NULL)
 733                 return (EINVAL);
 734         if (encini) {                   /* validate key length */
 735                 switch (encini->cri_alg) {
 736                 case CRYPTO_DES_CBC:
 737                         if (encini->cri_klen != 64)
 738                                 return (EINVAL);
 739                         break;
 740                 case CRYPTO_3DES_CBC:
 741                         if (encini->cri_klen != 192)
 742                                 return (EINVAL);
 743                         break;
 744                 case CRYPTO_AES_CBC:
 745                         if (encini->cri_klen != 128 &&
 746                             encini->cri_klen != 192 &&
 747                             encini->cri_klen != 256)
 748                                 return (EINVAL);
 749                         break;
 750                 }
 751         }
 752
 753         if (sc->sc_sessions == NULL) {
 754                 ses = sc->sc_sessions = (struct safe_session *)kmalloc(
 755                     sizeof(struct safe_session), M_DEVBUF, M_NOWAIT);
 756                 if (ses == NULL)
 757                         return (ENOMEM);
 758                 sesn = 0;
 759                 sc->sc_nsessions = 1;
 760         } else {
 761                 for (sesn = 0; sesn < sc->sc_nsessions; sesn++) {
 762                         if (sc->sc_sessions[sesn].ses_used == 0) {
 763                                 ses = &sc->sc_sessions[sesn];
 764                                 break;
 765                         }
 766                 }
 767
 768                 if (ses == NULL) {
 769                         sesn = sc->sc_nsessions;
 770                         ses = (struct safe_session *)kmalloc((sesn + 1) *
 771                             sizeof(struct safe_session), M_DEVBUF, M_NOWAIT);
 772                         if (ses == NULL)
 773                                 return (ENOMEM);
 774                         bcopy(sc->sc_sessions, ses, sesn *
 775                             sizeof(struct safe_session));
 776                         bzero(sc->sc_sessions, sesn *
 777                             sizeof(struct safe_session));
 778                         kfree(sc->sc_sessions, M_DEVBUF);
 779                         sc->sc_sessions = ses;
 780                         ses = &sc->sc_sessions[sesn];
 781                         sc->sc_nsessions++;
 782                 }
 783         }
 784
 785         bzero(ses, sizeof(struct safe_session));
 786         ses->ses_used = 1;
 787
 788         if (encini) {
 789                 /* get an IV */
 790                 /* XXX may read fewer than requested */
 791                 read_random(ses->ses_iv, sizeof(ses->ses_iv));
 792
 793                 ses->ses_klen = encini->cri_klen;
 794                 if (encini->cri_key != NULL)
 795                         safe_setup_enckey(ses, encini->cri_key);
 796         }
 797
 798         if (macini) {
 799                 ses->ses_mlen = macini->cri_mlen;
 800                 if (ses->ses_mlen == 0) {
 801                         if (macini->cri_alg == CRYPTO_MD5_HMAC)
 802                                 ses->ses_mlen = MD5_HASH_LEN;
 803                         else
 804                                 ses->ses_mlen = SHA1_HASH_LEN;
 805                 }
 806
 807                 if (macini->cri_key != NULL) {
 808                         safe_setup_mackey(ses, macini->cri_alg, macini->cri_key,
 809                             macini->cri_klen / 8);
 810                 }
 811         }
 812
 813         *sidp = SAFE_SID(device_get_unit(sc->sc_dev), sesn);
 814         return (0);
 815 }
 816
 817 /*
 818  * Deallocate a session.
 819  */
 820 static int
 821 safe_freesession(device_t dev, u_int64_t tid)
 822 {
 823         struct safe_softc *sc = device_get_softc(dev);
 824         int session, ret;
 825         u_int32_t sid = ((u_int32_t) tid) & 0xffffffff;
 826
 827         if (sc == NULL)
 828                 return (EINVAL);
 829
 830         session = SAFE_SESSION(sid);
 831         if (session < sc->sc_nsessions) {
 832                 bzero(&sc->sc_sessions[session], sizeof(sc->sc_sessions[session]));
 833                 ret = 0;
 834         } else
 835                 ret = EINVAL;
 836         return (ret);
 837 }
 838
 839 static void
 840 safe_op_cb(void *arg, bus_dma_segment_t *seg, int nsegs, bus_size_t mapsize, int error)
 841 {
 842         struct safe_operand *op = arg;
 843
 844         DPRINTF(("%s: mapsize %u nsegs %d error %d\n", __func__,
 845                 (u_int) mapsize, nsegs, error));
 846         if (error != 0)
 847                 return;
 848         op->mapsize = mapsize;
 849         op->nsegs = nsegs;
 850         bcopy(seg, op->segs, nsegs * sizeof (seg[0]));
 851 }
 852
 853 static int
 854 safe_process(device_t dev, struct cryptop *crp, int hint)
 855 {
 856         struct safe_softc *sc = device_get_softc(dev);
 857         int err = 0, i, nicealign, uniform;
 858         struct cryptodesc *crd1, *crd2, *maccrd, *enccrd;
 859         int bypass, oplen, ivsize;
 860         caddr_t iv;
 861         int16_t coffset;
 862         struct safe_session *ses;
 863         struct safe_ringentry *re;
 864         struct safe_sarec *sa;
 865         struct safe_pdesc *pd;
 866         u_int32_t cmd0, cmd1, staterec;
 867
 868         if (crp == NULL || crp->crp_callback == NULL || sc == NULL) {
 869                 safestats.st_invalid++;
 870                 return (EINVAL);
 871         }
 872         if (SAFE_SESSION(crp->crp_sid) >= sc->sc_nsessions) {
 873                 safestats.st_badsession++;
 874                 return (EINVAL);
 875         }
 876
 877         lockmgr(&sc->sc_ringlock, LK_EXCLUSIVE);
 878         if (sc->sc_front == sc->sc_back && sc->sc_nqchip != 0) {
 879                 safestats.st_ringfull++;
 880                 sc->sc_needwakeup |= CRYPTO_SYMQ;
 881                 lockmgr(&sc->sc_ringlock, LK_RELEASE);
 882                 return (ERESTART);
 883         }
 884         re = sc->sc_front;
 885
 886         staterec = re->re_sa.sa_staterec;       /* save */
 887         /* NB: zero everything but the PE descriptor */
 888         bzero(&re->re_sa, sizeof(struct safe_ringentry) - sizeof(re->re_desc));
 889         re->re_sa.sa_staterec = staterec;       /* restore */
 890
 891         re->re_crp = crp;
 892         re->re_sesn = SAFE_SESSION(crp->crp_sid);
 893
 894         if (crp->crp_flags & CRYPTO_F_IMBUF) {
 895                 re->re_src_m = (struct mbuf *)crp->crp_buf;
 896                 re->re_dst_m = (struct mbuf *)crp->crp_buf;
 897         } else if (crp->crp_flags & CRYPTO_F_IOV) {
 898                 re->re_src_io = (struct uio *)crp->crp_buf;
 899                 re->re_dst_io = (struct uio *)crp->crp_buf;
 900         } else {
 901                 safestats.st_badflags++;
 902                 err = EINVAL;
 903                 goto errout;    /* XXX we don't handle contiguous blocks! */
 904         }
 905
 906         sa = &re->re_sa;
 907         ses = &sc->sc_sessions[re->re_sesn];
 908
 909         crd1 = crp->crp_desc;
 910         if (crd1 == NULL) {
 911                 safestats.st_nodesc++;
 912                 err = EINVAL;
 913                 goto errout;
 914         }
 915         crd2 = crd1->crd_next;
 916
 917         cmd0 = SAFE_SA_CMD0_BASIC;              /* basic group operation */
 918         cmd1 = 0;
 919         if (crd2 == NULL) {
 920                 if (crd1->crd_alg == CRYPTO_MD5_HMAC ||
 921                     crd1->crd_alg == CRYPTO_SHA1_HMAC ||
 922                     crd1->crd_alg == CRYPTO_NULL_HMAC) {
 923                         maccrd = crd1;
 924                         enccrd = NULL;
 925                         cmd0 |= SAFE_SA_CMD0_OP_HASH;
 926                 } else if (crd1->crd_alg == CRYPTO_DES_CBC ||
 927                     crd1->crd_alg == CRYPTO_3DES_CBC ||
 928                     crd1->crd_alg == CRYPTO_AES_CBC ||
 929                     crd1->crd_alg == CRYPTO_NULL_CBC) {
 930                         maccrd = NULL;
 931                         enccrd = crd1;
 932                         cmd0 |= SAFE_SA_CMD0_OP_CRYPT;
 933                 } else {
 934                         safestats.st_badalg++;
 935                         err = EINVAL;
 936                         goto errout;
 937                 }
 938         } else {
 939                 if ((crd1->crd_alg == CRYPTO_MD5_HMAC ||
 940                     crd1->crd_alg == CRYPTO_SHA1_HMAC ||
 941                     crd1->crd_alg == CRYPTO_NULL_HMAC) &&
 942                     (crd2->crd_alg == CRYPTO_DES_CBC ||
 943                         crd2->crd_alg == CRYPTO_3DES_CBC ||
 944                         crd2->crd_alg == CRYPTO_AES_CBC ||
 945                         crd2->crd_alg == CRYPTO_NULL_CBC) &&
 946                     ((crd2->crd_flags & CRD_F_ENCRYPT) == 0)) {
 947                         maccrd = crd1;
 948                         enccrd = crd2;
 949                 } else if ((crd1->crd_alg == CRYPTO_DES_CBC ||
 950                     crd1->crd_alg == CRYPTO_3DES_CBC ||
 951                     crd1->crd_alg == CRYPTO_AES_CBC ||
 952                     crd1->crd_alg == CRYPTO_NULL_CBC) &&
 953                     (crd2->crd_alg == CRYPTO_MD5_HMAC ||
 954                         crd2->crd_alg == CRYPTO_SHA1_HMAC ||
 955                         crd2->crd_alg == CRYPTO_NULL_HMAC) &&
 956                     (crd1->crd_flags & CRD_F_ENCRYPT)) {
 957                         enccrd = crd1;
 958                         maccrd = crd2;
 959                 } else {
 960                         safestats.st_badalg++;
 961                         err = EINVAL;
 962                         goto errout;
 963                 }
 964                 cmd0 |= SAFE_SA_CMD0_OP_BOTH;
 965         }
 966
 967         if (enccrd) {
 968                 if (enccrd->crd_flags & CRD_F_KEY_EXPLICIT)
 969                         safe_setup_enckey(ses, enccrd->crd_key);
 970
 971                 if (enccrd->crd_alg == CRYPTO_DES_CBC) {
 972                         cmd0 |= SAFE_SA_CMD0_DES;
 973                         cmd1 |= SAFE_SA_CMD1_CBC;
 974                         ivsize = 2*sizeof(u_int32_t);
 975                 } else if (enccrd->crd_alg == CRYPTO_3DES_CBC) {
 976                         cmd0 |= SAFE_SA_CMD0_3DES;
 977                         cmd1 |= SAFE_SA_CMD1_CBC;
 978                         ivsize = 2*sizeof(u_int32_t);
 979                 } else if (enccrd->crd_alg == CRYPTO_AES_CBC) {
 980                         cmd0 |= SAFE_SA_CMD0_AES;
 981                         cmd1 |= SAFE_SA_CMD1_CBC;
 982                         if (ses->ses_klen == 128)
 983                              cmd1 |=  SAFE_SA_CMD1_AES128;
 984                         else if (ses->ses_klen == 192)
 985                              cmd1 |=  SAFE_SA_CMD1_AES192;
 986                         else
 987                              cmd1 |=  SAFE_SA_CMD1_AES256;
 988                         ivsize = 4*sizeof(u_int32_t);
 989                 } else {
 990                         cmd0 |= SAFE_SA_CMD0_CRYPT_NULL;
 991                         ivsize = 0;
 992                 }
 993
 994                 /*
 995                  * Setup encrypt/decrypt state.  When using basic ops
 996                  * we can't use an inline IV because hash/crypt offset
 997                  * must be from the end of the IV to the start of the
 998                  * crypt data and this leaves out the preceding header
 999                  * from the hash calculation.  Instead we place the IV
1000                  * in the state record and set the hash/crypt offset to
1001                  * copy both the header+IV.
1002                  */
1003                 if (enccrd->crd_flags & CRD_F_ENCRYPT) {
1004                         cmd0 |= SAFE_SA_CMD0_OUTBOUND;
1005
1006                         if (enccrd->crd_flags & CRD_F_IV_EXPLICIT)
1007                                 iv = enccrd->crd_iv;
1008                         else
1009                                 iv = (caddr_t) ses->ses_iv;
1010                         if ((enccrd->crd_flags & CRD_F_IV_PRESENT) == 0) {
1011                                 crypto_copyback(crp->crp_flags, crp->crp_buf,
1012                                     enccrd->crd_inject, ivsize, iv);
1013                         }
1014                         bcopy(iv, re->re_sastate.sa_saved_iv, ivsize);
1015                         cmd0 |= SAFE_SA_CMD0_IVLD_STATE | SAFE_SA_CMD0_SAVEIV;
1016                         re->re_flags |= SAFE_QFLAGS_COPYOUTIV;
1017                 } else {
1018                         cmd0 |= SAFE_SA_CMD0_INBOUND;
1019
1020                         if (enccrd->crd_flags & CRD_F_IV_EXPLICIT) {
1021                                 bcopy(enccrd->crd_iv,
1022                                         re->re_sastate.sa_saved_iv, ivsize);
1023                         } else {
1024                                 crypto_copydata(crp->crp_flags, crp->crp_buf,
1025                                     enccrd->crd_inject, ivsize,
1026                                     (caddr_t)re->re_sastate.sa_saved_iv);
1027                         }
1028                         cmd0 |= SAFE_SA_CMD0_IVLD_STATE;
1029                 }
1030                 /*
1031                  * For basic encryption use the zero pad algorithm.
1032                  * This pads results to an 8-byte boundary and
1033                  * suppresses padding verification for inbound (i.e.
1034                  * decrypt) operations.
1035                  *
1036                  * NB: Not sure if the 8-byte pad boundary is a problem.
1037                  */
1038                 cmd0 |= SAFE_SA_CMD0_PAD_ZERO;
1039
1040                 /* XXX assert key bufs have the same size */
1041                 bcopy(ses->ses_key, sa->sa_key, sizeof(sa->sa_key));
1042         }
1043
1044         if (maccrd) {
1045                 if (maccrd->crd_flags & CRD_F_KEY_EXPLICIT) {
1046                         safe_setup_mackey(ses, maccrd->crd_alg,
1047                             maccrd->crd_key, maccrd->crd_klen / 8);
1048                 }
1049
1050                 if (maccrd->crd_alg == CRYPTO_MD5_HMAC) {
1051                         cmd0 |= SAFE_SA_CMD0_MD5;
1052                         cmd1 |= SAFE_SA_CMD1_HMAC;      /* NB: enable HMAC */
1053                 } else if (maccrd->crd_alg == CRYPTO_SHA1_HMAC) {
1054                         cmd0 |= SAFE_SA_CMD0_SHA1;
1055                         cmd1 |= SAFE_SA_CMD1_HMAC;      /* NB: enable HMAC */
1056                 } else {
1057                         cmd0 |= SAFE_SA_CMD0_HASH_NULL;
1058                 }
1059                 /*
1060                  * Digest data is loaded from the SA and the hash
1061                  * result is saved to the state block where we
1062                  * retrieve it for return to the caller.
1063                  */
1064                 /* XXX assert digest bufs have the same size */
1065                 bcopy(ses->ses_hminner, sa->sa_indigest,
1066                         sizeof(sa->sa_indigest));
1067                 bcopy(ses->ses_hmouter, sa->sa_outdigest,
1068                         sizeof(sa->sa_outdigest));
1069
1070                 cmd0 |= SAFE_SA_CMD0_HSLD_SA | SAFE_SA_CMD0_SAVEHASH;
1071                 re->re_flags |= SAFE_QFLAGS_COPYOUTICV;
1072         }
1073
1074         if (enccrd && maccrd) {
1075                 /*
1076                  * The offset from hash data to the start of
1077                  * crypt data is the difference in the skips.
1078                  */
1079                 bypass = maccrd->crd_skip;
1080                 coffset = enccrd->crd_skip - maccrd->crd_skip;
1081                 if (coffset < 0) {
1082                         DPRINTF(("%s: hash does not precede crypt; "
1083                                 "mac skip %u enc skip %u\n",
1084                                 __func__, maccrd->crd_skip, enccrd->crd_skip));
1085                         safestats.st_skipmismatch++;
1086                         err = EINVAL;
1087                         goto errout;
1088                 }
1089                 oplen = enccrd->crd_skip + enccrd->crd_len;
1090                 if (maccrd->crd_skip + maccrd->crd_len != oplen) {
1091                         DPRINTF(("%s: hash amount %u != crypt amount %u\n",
1092                                 __func__, maccrd->crd_skip + maccrd->crd_len,
1093                                 oplen));
1094                         safestats.st_lenmismatch++;
1095                         err = EINVAL;
1096                         goto errout;
1097                 }
1098 #ifdef SAFE_DEBUG
1099                 if (safe_debug) {
1100                         kprintf("mac: skip %d, len %d, inject %d\n",
1101                             maccrd->crd_skip, maccrd->crd_len,
1102                             maccrd->crd_inject);
1103                         kprintf("enc: skip %d, len %d, inject %d\n",
1104                             enccrd->crd_skip, enccrd->crd_len,
1105                             enccrd->crd_inject);
1106                         kprintf("bypass %d coffset %d oplen %d\n",
1107                                 bypass, coffset, oplen);
1108                 }
1109 #endif
1110                 if (coffset & 3) {      /* offset must be 32-bit aligned */
1111                         DPRINTF(("%s: coffset %u misaligned\n",
1112                                 __func__, coffset));
1113                         safestats.st_coffmisaligned++;
1114                         err = EINVAL;
1115                         goto errout;
1116                 }
1117                 coffset >>= 2;
1118                 if (coffset > 255) {    /* offset must be <256 dwords */
1119                         DPRINTF(("%s: coffset %u too big\n",
1120                                 __func__, coffset));
1121                         safestats.st_cofftoobig++;
1122                         err = EINVAL;
1123                         goto errout;
1124                 }
1125                 /*
1126                  * Tell the hardware to copy the header to the output.
1127                  * The header is defined as the data from the end of
1128                  * the bypass to the start of data to be encrypted.
1129                  * Typically this is the inline IV.  Note that you need
1130                  * to do this even if src+dst are the same; it appears
1131                  * that w/o this bit the crypted data is written
1132                  * immediately after the bypass data.
1133                  */
1134                 cmd1 |= SAFE_SA_CMD1_HDRCOPY;
1135                 /*
1136                  * Disable IP header mutable bit handling.  This is
1137                  * needed to get correct HMAC calculations.
1138                  */
1139                 cmd1 |= SAFE_SA_CMD1_MUTABLE;
1140         } else {
1141                 if (enccrd) {
1142                         bypass = enccrd->crd_skip;
1143                         oplen = bypass + enccrd->crd_len;
1144                 } else {
1145                         bypass = maccrd->crd_skip;
1146                         oplen = bypass + maccrd->crd_len;
1147                 }
1148                 coffset = 0;
1149         }
1150         /* XXX verify multiple of 4 when using s/g */
1151         if (bypass > 96) {              /* bypass offset must be <= 96 bytes */
1152                 DPRINTF(("%s: bypass %u too big\n", __func__, bypass));
1153                 safestats.st_bypasstoobig++;
1154                 err = EINVAL;
1155                 goto errout;
1156         }
1157
1158         if (bus_dmamap_create(sc->sc_srcdmat, BUS_DMA_NOWAIT, &re->re_src_map)) {
1159                 safestats.st_nomap++;
1160                 err = ENOMEM;
1161                 goto errout;
1162         }
1163         if (crp->crp_flags & CRYPTO_F_IMBUF) {
1164                 if (bus_dmamap_load_mbuf(sc->sc_srcdmat, re->re_src_map,
1165                     re->re_src_m, safe_op_cb,
1166                     &re->re_src, BUS_DMA_NOWAIT) != 0) {
1167                         bus_dmamap_destroy(sc->sc_srcdmat, re->re_src_map);
1168                         re->re_src_map = NULL;
1169                         safestats.st_noload++;
1170                         err = ENOMEM;
1171                         goto errout;
1172                 }
1173         } else if (crp->crp_flags & CRYPTO_F_IOV) {
1174                 if (bus_dmamap_load_uio(sc->sc_srcdmat, re->re_src_map,
1175                     re->re_src_io, safe_op_cb,
1176                     &re->re_src, BUS_DMA_NOWAIT) != 0) {
1177                         bus_dmamap_destroy(sc->sc_srcdmat, re->re_src_map);
1178                         re->re_src_map = NULL;
1179                         safestats.st_noload++;
1180                         err = ENOMEM;
1181                         goto errout;
1182                 }
1183         }
1184         nicealign = safe_dmamap_aligned(&re->re_src);
1185         uniform = safe_dmamap_uniform(&re->re_src);
1186
1187         DPRINTF(("src nicealign %u uniform %u nsegs %u\n",
1188                 nicealign, uniform, re->re_src.nsegs));
1189         if (re->re_src.nsegs > 1) {
1190                 re->re_desc.d_src = sc->sc_spalloc.dma_paddr +
1191                         ((caddr_t) sc->sc_spfree - (caddr_t) sc->sc_spring);
1192                 for (i = 0; i < re->re_src_nsegs; i++) {
1193                         /* NB: no need to check if there's space */
1194                         pd = sc->sc_spfree;
1195                         if (++(sc->sc_spfree) == sc->sc_springtop)
1196                                 sc->sc_spfree = sc->sc_spring;
1197
1198                         KASSERT((pd->pd_flags&3) == 0 ||
1199                                 (pd->pd_flags&3) == SAFE_PD_DONE,
1200                                 ("bogus source particle descriptor; flags %x",
1201                                 pd->pd_flags));
1202                         pd->pd_addr = re->re_src_segs[i].ds_addr;
1203                         pd->pd_size = re->re_src_segs[i].ds_len;
1204                         pd->pd_flags = SAFE_PD_READY;
1205                 }
1206                 cmd0 |= SAFE_SA_CMD0_IGATHER;
1207         } else {
1208                 /*
1209                  * No need for gather, reference the operand directly.
1210                  */
1211                 re->re_desc.d_src = re->re_src_segs[0].ds_addr;
1212         }
1213
1214         if (enccrd == NULL && maccrd != NULL) {
1215                 /*
1216                  * Hash op; no destination needed.
1217                  */
1218         } else {
1219                 if (crp->crp_flags & CRYPTO_F_IOV) {
1220                         if (!nicealign) {
1221                                 safestats.st_iovmisaligned++;
1222                                 err = EINVAL;
1223                                 goto errout;
1224                         }
1225                         if (uniform != 1) {
1226                                 /*
1227                                  * Source is not suitable for direct use as
1228                                  * the destination.  Create a new scatter/gather
1229                                  * list based on the destination requirements
1230                                  * and check if that's ok.
1231                                  */
1232                                 if (bus_dmamap_create(sc->sc_dstdmat,
1233                                     BUS_DMA_NOWAIT, &re->re_dst_map)) {
1234                                         safestats.st_nomap++;
1235                                         err = ENOMEM;
1236                                         goto errout;
1237                                 }
1238                                 if (bus_dmamap_load_uio(sc->sc_dstdmat,
1239                                     re->re_dst_map, re->re_dst_io,
1240                                     safe_op_cb, &re->re_dst,
1241                                     BUS_DMA_NOWAIT) != 0) {
1242                                         bus_dmamap_destroy(sc->sc_dstdmat,
1243                                                 re->re_dst_map);
1244                                         re->re_dst_map = NULL;
1245                                         safestats.st_noload++;
1246                                         err = ENOMEM;
1247                                         goto errout;
1248                                 }
1249                                 uniform = safe_dmamap_uniform(&re->re_dst);
1250                                 if (!uniform) {
1251                                         /*
1252                                          * There's no way to handle the DMA
1253                                          * requirements with this uio.  We
1254                                          * could create a separate DMA area for
1255                                          * the result and then copy it back,
1256                                          * but for now we just bail and return
1257                                          * an error.  Note that uio requests
1258                                          * > SAFE_MAX_DSIZE are handled because
1259                                          * the DMA map and segment list for the
1260                                          * destination wil result in a
1261                                          * destination particle list that does
1262                                          * the necessary scatter DMA.
1263                                          */
1264                                         safestats.st_iovnotuniform++;
1265                                         err = EINVAL;
1266                                         goto errout;
1267                                 }
1268                         } else
1269                                 re->re_dst = re->re_src;
1270                 } else if (crp->crp_flags & CRYPTO_F_IMBUF) {
1271                         if (nicealign && uniform == 1) {
1272                                 /*
1273                                  * Source layout is suitable for direct
1274                                  * sharing of the DMA map and segment list.
1275                                  */
1276                                 re->re_dst = re->re_src;
1277                         } else if (nicealign && uniform == 2) {
1278                                 /*
1279                                  * The source is properly aligned but requires a
1280                                  * different particle list to handle DMA of the
1281                                  * result.  Create a new map and do the load to
1282                                  * create the segment list.  The particle
1283                                  * descriptor setup code below will handle the
1284                                  * rest.
1285                                  */
1286                                 if (bus_dmamap_create(sc->sc_dstdmat,
1287                                     BUS_DMA_NOWAIT, &re->re_dst_map)) {
1288                                         safestats.st_nomap++;
1289                                         err = ENOMEM;
1290                                         goto errout;
1291                                 }
1292                                 if (bus_dmamap_load_mbuf(sc->sc_dstdmat,
1293                                     re->re_dst_map, re->re_dst_m,
1294                                     safe_op_cb, &re->re_dst,
1295                                     BUS_DMA_NOWAIT) != 0) {
1296                                         bus_dmamap_destroy(sc->sc_dstdmat,
1297                                                 re->re_dst_map);
1298                                         re->re_dst_map = NULL;
1299                                         safestats.st_noload++;
1300                                         err = ENOMEM;
1301                                         goto errout;
1302                                 }
1303                         } else {                /* !(aligned and/or uniform) */
1304                                 int totlen, len;
1305                                 struct mbuf *m, *top, **mp;
1306
1307                                 /*
1308                                  * DMA constraints require that we allocate a
1309                                  * new mbuf chain for the destination.  We
1310                                  * allocate an entire new set of mbufs of
1311                                  * optimal/required size and then tell the
1312                                  * hardware to copy any bits that are not
1313                                  * created as a byproduct of the operation.
1314                                  */
1315                                 if (!nicealign)
1316                                         safestats.st_unaligned++;
1317                                 if (!uniform)
1318                                         safestats.st_notuniform++;
1319                                 totlen = re->re_src_mapsize;
1320                                 if (re->re_src_m->m_flags & M_PKTHDR) {
1321                                         len = MHLEN;
1322                                         MGETHDR(m, M_NOWAIT, MT_DATA);
1323                                         if (m && !m_dup_pkthdr(m, re->re_src_m,
1324                                             M_NOWAIT)) {
1325                                                 m_free(m);
1326                                                 m = NULL;
1327                                         }
1328                                 } else {
1329                                         len = MLEN;
1330                                         MGET(m, M_NOWAIT, MT_DATA);
1331                                 }
1332                                 if (m == NULL) {
1333                                         safestats.st_nombuf++;
1334                                         err = sc->sc_nqchip ? ERESTART : ENOMEM;
1335                                         goto errout;
1336                                 }
1337                                 if (totlen >= MINCLSIZE) {
1338                                         MCLGET(m, M_NOWAIT);
1339                                         if ((m->m_flags & M_EXT) == 0) {
1340                                                 m_free(m);
1341                                                 safestats.st_nomcl++;
1342                                                 err = sc->sc_nqchip ?
1343                                                         ERESTART : ENOMEM;
1344                                                 goto errout;
1345                                         }
1346                                         len = MCLBYTES;
1347                                 }
1348                                 m->m_len = len;
1349                                 top = NULL;
1350                                 mp = &top;
1351
1352                                 while (totlen > 0) {
1353                                         if (top) {
1354                                                 MGET(m, M_NOWAIT, MT_DATA);
1355                                                 if (m == NULL) {
1356                                                         m_freem(top);
1357                                                         safestats.st_nombuf++;
1358                                                         err = sc->sc_nqchip ?
1359                                                             ERESTART : ENOMEM;
1360                                                         goto errout;
1361                                                 }
1362                                                 len = MLEN;
1363                                         }
1364                                         if (top && totlen >= MINCLSIZE) {
1365                                                 MCLGET(m, M_NOWAIT);
1366                                                 if ((m->m_flags & M_EXT) == 0) {
1367                                                         *mp = m;
1368                                                         m_freem(top);
1369                                                         safestats.st_nomcl++;
1370                                                         err = sc->sc_nqchip ?
1371                                                             ERESTART : ENOMEM;
1372                                                         goto errout;
1373                                                 }
1374                                                 len = MCLBYTES;
1375                                         }
1376                                         m->m_len = len = min(totlen, len);
1377                                         totlen -= len;
1378                                         *mp = m;
1379                                         mp = &m->m_next;
1380                                 }
1381                                 re->re_dst_m = top;
1382                                 if (bus_dmamap_create(sc->sc_dstdmat,
1383                                     BUS_DMA_NOWAIT, &re->re_dst_map) != 0) {
1384                                         safestats.st_nomap++;
1385                                         err = ENOMEM;
1386                                         goto errout;
1387                                 }
1388                                 if (bus_dmamap_load_mbuf(sc->sc_dstdmat,
1389                                     re->re_dst_map, re->re_dst_m,
1390                                     safe_op_cb, &re->re_dst,
1391                                     BUS_DMA_NOWAIT) != 0) {
1392                                         bus_dmamap_destroy(sc->sc_dstdmat,
1393                                         re->re_dst_map);
1394                                         re->re_dst_map = NULL;
1395                                         safestats.st_noload++;
1396                                         err = ENOMEM;
1397                                         goto errout;
1398                                 }
1399                                 if (re->re_src.mapsize > oplen) {
1400                                         /*
1401                                          * There's data following what the
1402                                          * hardware will copy for us.  If this
1403                                          * isn't just the ICV (that's going to
1404                                          * be written on completion), copy it
1405                                          * to the new mbufs
1406                                          */
1407                                         if (!(maccrd &&
1408                                             (re->re_src.mapsize-oplen) == 12 &&
1409                                             maccrd->crd_inject == oplen))
1410                                                 safe_mcopy(re->re_src_m,
1411                                                            re->re_dst_m,
1412                                                            oplen);
1413                                         else
1414                                                 safestats.st_noicvcopy++;
1415                                 }
1416                         }
1417                 } else {
1418                         safestats.st_badflags++;
1419                         err = EINVAL;
1420                         goto errout;
1421                 }
1422
1423                 if (re->re_dst.nsegs > 1) {
1424                         re->re_desc.d_dst = sc->sc_dpalloc.dma_paddr +
1425                             ((caddr_t) sc->sc_dpfree - (caddr_t) sc->sc_dpring);
1426                         for (i = 0; i < re->re_dst_nsegs; i++) {
1427                                 pd = sc->sc_dpfree;
1428                                 KASSERT((pd->pd_flags&3) == 0 ||
1429                                         (pd->pd_flags&3) == SAFE_PD_DONE,
1430                                         ("bogus dest particle descriptor; flags %x",
1431                                                 pd->pd_flags));
1432                                 if (++(sc->sc_dpfree) == sc->sc_dpringtop)
1433                                         sc->sc_dpfree = sc->sc_dpring;
1434                                 pd->pd_addr = re->re_dst_segs[i].ds_addr;
1435                                 pd->pd_flags = SAFE_PD_READY;
1436                         }
1437                         cmd0 |= SAFE_SA_CMD0_OSCATTER;
1438                 } else {
1439                         /*
1440                          * No need for scatter, reference the operand directly.
1441                          */
1442                         re->re_desc.d_dst = re->re_dst_segs[0].ds_addr;
1443                 }
1444         }
1445
1446         /*
1447          * All done with setup; fillin the SA command words
1448          * and the packet engine descriptor.  The operation
1449          * is now ready for submission to the hardware.
1450          */
1451         sa->sa_cmd0 = cmd0 | SAFE_SA_CMD0_IPCI | SAFE_SA_CMD0_OPCI;
1452         sa->sa_cmd1 = cmd1
1453                     | (coffset << SAFE_SA_CMD1_OFFSET_S)
1454                     | SAFE_SA_CMD1_SAREV1       /* Rev 1 SA data structure */
1455                     | SAFE_SA_CMD1_SRPCI
1456                     ;
1457         /*
1458          * NB: the order of writes is important here.  In case the
1459          * chip is scanning the ring because of an outstanding request
1460          * it might nab this one too.  In that case we need to make
1461          * sure the setup is complete before we write the length
1462          * field of the descriptor as it signals the descriptor is
1463          * ready for processing.
1464          */
1465         re->re_desc.d_csr = SAFE_PE_CSR_READY | SAFE_PE_CSR_SAPCI;
1466         if (maccrd)
1467                 re->re_desc.d_csr |= SAFE_PE_CSR_LOADSA | SAFE_PE_CSR_HASHFINAL;
1468         re->re_desc.d_len = oplen
1469                           | SAFE_PE_LEN_READY
1470                           | (bypass << SAFE_PE_LEN_BYPASS_S)
1471                           ;
1472
1473         safestats.st_ipackets++;
1474         safestats.st_ibytes += oplen;
1475
1476         if (++(sc->sc_front) == sc->sc_ringtop)
1477                 sc->sc_front = sc->sc_ring;
1478
1479         /* XXX honor batching */
1480         safe_feed(sc, re);
1481         lockmgr(&sc->sc_ringlock, LK_RELEASE);
1482         return (0);
1483
1484 errout:
1485         if ((re->re_dst_m != NULL) && (re->re_src_m != re->re_dst_m))
1486                 m_freem(re->re_dst_m);
1487
1488         if (re->re_dst_map != NULL && re->re_dst_map != re->re_src_map) {
1489                 bus_dmamap_unload(sc->sc_dstdmat, re->re_dst_map);
1490                 bus_dmamap_destroy(sc->sc_dstdmat, re->re_dst_map);
1491         }
1492         if (re->re_src_map != NULL) {
1493                 bus_dmamap_unload(sc->sc_srcdmat, re->re_src_map);
1494                 bus_dmamap_destroy(sc->sc_srcdmat, re->re_src_map);
1495         }
1496         lockmgr(&sc->sc_ringlock, LK_RELEASE);
1497         if (err != ERESTART) {
1498                 crp->crp_etype = err;
1499                 crypto_done(crp);
1500         } else {
1501                 sc->sc_needwakeup |= CRYPTO_SYMQ;
1502         }
1503         return (err);
1504 }
1505
1506 static void
1507 safe_callback(struct safe_softc *sc, struct safe_ringentry *re)
1508 {
1509         struct cryptop *crp = (struct cryptop *)re->re_crp;
1510         struct cryptodesc *crd;
1511
1512         safestats.st_opackets++;
1513         safestats.st_obytes += re->re_dst.mapsize;
1514
1515         safe_dma_sync(&sc->sc_ringalloc,
1516                 BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
1517         if (re->re_desc.d_csr & SAFE_PE_CSR_STATUS) {
1518                 device_printf(sc->sc_dev, "csr 0x%x cmd0 0x%x cmd1 0x%x\n",
1519                         re->re_desc.d_csr,
1520                         re->re_sa.sa_cmd0, re->re_sa.sa_cmd1);
1521                 safestats.st_peoperr++;
1522                 crp->crp_etype = EIO;           /* something more meaningful? */
1523         }
1524         if (re->re_dst_map != NULL && re->re_dst_map != re->re_src_map) {
1525                 bus_dmamap_sync(sc->sc_dstdmat, re->re_dst_map,
1526                     BUS_DMASYNC_POSTREAD);
1527                 bus_dmamap_unload(sc->sc_dstdmat, re->re_dst_map);
1528                 bus_dmamap_destroy(sc->sc_dstdmat, re->re_dst_map);
1529         }
1530         bus_dmamap_sync(sc->sc_srcdmat, re->re_src_map, BUS_DMASYNC_POSTWRITE);
1531         bus_dmamap_unload(sc->sc_srcdmat, re->re_src_map);
1532         bus_dmamap_destroy(sc->sc_srcdmat, re->re_src_map);
1533
1534         /*
1535          * If result was written to a differet mbuf chain, swap
1536          * it in as the return value and reclaim the original.
1537          */
1538         if ((crp->crp_flags & CRYPTO_F_IMBUF) && re->re_src_m != re->re_dst_m) {
1539                 m_freem(re->re_src_m);
1540                 crp->crp_buf = (caddr_t)re->re_dst_m;
1541         }
1542
1543         if (re->re_flags & SAFE_QFLAGS_COPYOUTIV) {
1544                 /* copy out IV for future use */
1545                 for (crd = crp->crp_desc; crd; crd = crd->crd_next) {
1546                         int ivsize;
1547
1548                         if (crd->crd_alg == CRYPTO_DES_CBC ||
1549                             crd->crd_alg == CRYPTO_3DES_CBC) {
1550                                 ivsize = 2*sizeof(u_int32_t);
1551                         } else if (crd->crd_alg == CRYPTO_AES_CBC) {
1552                                 ivsize = 4*sizeof(u_int32_t);
1553                         } else
1554                                 continue;
1555                         crypto_copydata(crp->crp_flags, crp->crp_buf,
1556                             crd->crd_skip + crd->crd_len - ivsize, ivsize,
1557                             (caddr_t)sc->sc_sessions[re->re_sesn].ses_iv);
1558                         break;
1559                 }
1560         }
1561
1562         if (re->re_flags & SAFE_QFLAGS_COPYOUTICV) {
1563                 /* copy out ICV result */
1564                 for (crd = crp->crp_desc; crd; crd = crd->crd_next) {
1565                         if (!(crd->crd_alg == CRYPTO_MD5_HMAC ||
1566                             crd->crd_alg == CRYPTO_SHA1_HMAC ||
1567                             crd->crd_alg == CRYPTO_NULL_HMAC))
1568                                 continue;
1569                         if (crd->crd_alg == CRYPTO_SHA1_HMAC) {
1570                                 /*
1571                                  * SHA-1 ICV's are byte-swapped; fix 'em up
1572                                  * before copy them to their destination.
1573                                  */
1574                                 re->re_sastate.sa_saved_indigest[0] =
1575                                     bswap32(re->re_sastate.sa_saved_indigest[0]);
1576                                 re->re_sastate.sa_saved_indigest[1] =
1577                                     bswap32(re->re_sastate.sa_saved_indigest[1]);
1578                                 re->re_sastate.sa_saved_indigest[2] =
1579                                     bswap32(re->re_sastate.sa_saved_indigest[2]);
1580                         }
1581                         crypto_copyback(crp->crp_flags, crp->crp_buf,
1582                             crd->crd_inject,
1583                             sc->sc_sessions[re->re_sesn].ses_mlen,
1584                             (caddr_t)re->re_sastate.sa_saved_indigest);
1585                         break;
1586                 }
1587         }
1588         crypto_done(crp);
1589 }
1590
1591 /*
1592  * Copy all data past offset from srcm to dstm.
1593  */
1594 static void
1595 safe_mcopy(struct mbuf *srcm, struct mbuf *dstm, u_int offset)
1596 {
1597         u_int j, dlen, slen;
1598         caddr_t dptr, sptr;
1599
1600         /*
1601          * Advance src and dst to offset.
1602          */
1603         j = offset;
1604         while (j >= 0) {
1605                 if (srcm->m_len > j)
1606                         break;
1607                 j -= srcm->m_len;
1608                 srcm = srcm->m_next;
1609                 if (srcm == NULL)
1610                         return;
1611         }
1612         sptr = mtod(srcm, caddr_t) + j;
1613         slen = srcm->m_len - j;
1614
1615         j = offset;
1616         while (j >= 0) {
1617                 if (dstm->m_len > j)
1618                         break;
1619                 j -= dstm->m_len;
1620                 dstm = dstm->m_next;
1621                 if (dstm == NULL)
1622                         return;
1623         }
1624         dptr = mtod(dstm, caddr_t) + j;
1625         dlen = dstm->m_len - j;
1626
1627         /*
1628          * Copy everything that remains.
1629          */
1630         for (;;) {
1631                 j = min(slen, dlen);
1632                 bcopy(sptr, dptr, j);
1633                 if (slen == j) {
1634                         srcm = srcm->m_next;
1635                         if (srcm == NULL)
1636                                 return;
1637                         sptr = srcm->m_data;
1638                         slen = srcm->m_len;
1639                 } else
1640                         sptr += j, slen -= j;
1641                 if (dlen == j) {
1642                         dstm = dstm->m_next;
1643                         if (dstm == NULL)
1644                                 return;
1645                         dptr = dstm->m_data;
1646                         dlen = dstm->m_len;
1647                 } else
1648                         dptr += j, dlen -= j;
1649         }
1650 }
1651
1652 #ifndef SAFE_NO_RNG
1653 #define SAFE_RNG_MAXWAIT        1000
1654
1655 static void
1656 safe_rng_init(struct safe_softc *sc)
1657 {
1658         u_int32_t w, v;
1659         int i;
1660
1661         WRITE_REG(sc, SAFE_RNG_CTRL, 0);
1662         /* use default value according to the manual */
1663         WRITE_REG(sc, SAFE_RNG_CNFG, 0x834);    /* magic from SafeNet */
1664         WRITE_REG(sc, SAFE_RNG_ALM_CNT, 0);
1665
1666         /*
1667          * There is a bug in rev 1.0 of the 1140 that when the RNG
1668          * is brought out of reset the ready status flag does not
1669          * work until the RNG has finished its internal initialization.
1670          *
1671          * So in order to determine the device is through its
1672          * initialization we must read the data register, using the
1673          * status reg in the read in case it is initialized.  Then read
1674          * the data register until it changes from the first read.
1675          * Once it changes read the data register until it changes
1676          * again.  At this time the RNG is considered initialized.
1677          * This could take between 750ms - 1000ms in time.
1678          */
1679         i = 0;
1680         w = READ_REG(sc, SAFE_RNG_OUT);
1681         do {
1682                 v = READ_REG(sc, SAFE_RNG_OUT);
1683                 if (v != w) {
1684                         w = v;
1685                         break;
1686                 }
1687                 DELAY(10);
1688         } while (++i < SAFE_RNG_MAXWAIT);
1689
1690         /* Wait Until data changes again */
1691         i = 0;
1692         do {
1693                 v = READ_REG(sc, SAFE_RNG_OUT);
1694                 if (v != w)
1695                         break;
1696                 DELAY(10);
1697         } while (++i < SAFE_RNG_MAXWAIT);
1698 }
1699
1700 static __inline void
1701 safe_rng_disable_short_cycle(struct safe_softc *sc)
1702 {
1703         WRITE_REG(sc, SAFE_RNG_CTRL,
1704                 READ_REG(sc, SAFE_RNG_CTRL) &~ SAFE_RNG_CTRL_SHORTEN);
1705 }
1706
1707 static __inline void
1708 safe_rng_enable_short_cycle(struct safe_softc *sc)
1709 {
1710         WRITE_REG(sc, SAFE_RNG_CTRL,
1711                 READ_REG(sc, SAFE_RNG_CTRL) | SAFE_RNG_CTRL_SHORTEN);
1712 }
1713
1714 static __inline u_int32_t
1715 safe_rng_read(struct safe_softc *sc)
1716 {
1717         int i;
1718
1719         i = 0;
1720         while (READ_REG(sc, SAFE_RNG_STAT) != 0 && ++i < SAFE_RNG_MAXWAIT)
1721                 ;
1722         return READ_REG(sc, SAFE_RNG_OUT);
1723 }
1724
1725 static void
1726 safe_rng(void *arg)
1727 {
1728         struct safe_softc *sc = arg;
1729         u_int32_t buf[SAFE_RNG_MAXBUFSIZ];      /* NB: maybe move to softc */
1730         u_int maxwords;
1731         int i;
1732
1733         safestats.st_rng++;
1734         /*
1735          * Fetch the next block of data.
1736          */
1737         maxwords = safe_rngbufsize;
1738         if (maxwords > SAFE_RNG_MAXBUFSIZ)
1739                 maxwords = SAFE_RNG_MAXBUFSIZ;
1740 retry:
1741         for (i = 0; i < maxwords; i++)
1742                 buf[i] = safe_rng_read(sc);
1743         /*
1744          * Check the comparator alarm count and reset the h/w if
1745          * it exceeds our threshold.  This guards against the
1746          * hardware oscillators resonating with external signals.
1747          */
1748         if (READ_REG(sc, SAFE_RNG_ALM_CNT) > safe_rngmaxalarm) {
1749                 u_int32_t freq_inc, w;
1750
1751                 DPRINTF(("%s: alarm count %u exceeds threshold %u\n", __func__,
1752                         READ_REG(sc, SAFE_RNG_ALM_CNT), safe_rngmaxalarm));
1753                 safestats.st_rngalarm++;
1754                 safe_rng_enable_short_cycle(sc);
1755                 freq_inc = 18;
1756                 for (i = 0; i < 64; i++) {
1757                         w = READ_REG(sc, SAFE_RNG_CNFG);
1758                         freq_inc = ((w + freq_inc) & 0x3fL);
1759                         w = ((w & ~0x3fL) | freq_inc);
1760                         WRITE_REG(sc, SAFE_RNG_CNFG, w);
1761
1762                         WRITE_REG(sc, SAFE_RNG_ALM_CNT, 0);
1763
1764                         (void) safe_rng_read(sc);
1765                         DELAY(25);
1766
1767                         if (READ_REG(sc, SAFE_RNG_ALM_CNT) == 0) {
1768                                 safe_rng_disable_short_cycle(sc);
1769                                 goto retry;
1770                         }
1771                         freq_inc = 1;
1772                 }
1773                 safe_rng_disable_short_cycle(sc);
1774         } else
1775                 WRITE_REG(sc, SAFE_RNG_ALM_CNT, 0);
1776
1777         (*sc->sc_harvest)(sc->sc_rndtest, buf, maxwords*sizeof (u_int32_t));
1778         callout_reset(&sc->sc_rngto,
1779                 hz * (safe_rnginterval ? safe_rnginterval : 1), safe_rng, sc);
1780 }
1781 #endif /* SAFE_NO_RNG */
1782
1783 static void
1784 safe_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
1785 {
1786         bus_addr_t *paddr = (bus_addr_t*) arg;
1787         *paddr = segs->ds_addr;
1788 }
1789
1790 static int
1791 safe_dma_malloc(
1792         struct safe_softc *sc,
1793         bus_size_t size,
1794         struct safe_dma_alloc *dma,
1795         int mapflags
1796 )
1797 {
1798         int r;
1799
1800         r = bus_dma_tag_create(NULL,                    /* parent */
1801                                sizeof(u_int32_t), 0,    /* alignment, bounds */
1802                                BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
1803                                BUS_SPACE_MAXADDR,       /* highaddr */
1804                                NULL, NULL,              /* filter, filterarg */
1805                                size,                    /* maxsize */
1806                                1,                       /* nsegments */
1807                                size,                    /* maxsegsize */
1808                                BUS_DMA_ALLOCNOW,        /* flags */
1809                                &dma->dma_tag);
1810         if (r != 0) {
1811                 device_printf(sc->sc_dev, "safe_dma_malloc: "
1812                         "bus_dma_tag_create failed; error %u\n", r);
1813                 goto fail_0;
1814         }
1815
1816         r = bus_dmamap_create(dma->dma_tag, BUS_DMA_NOWAIT, &dma->dma_map);
1817         if (r != 0) {
1818                 device_printf(sc->sc_dev, "safe_dma_malloc: "
1819                         "bus_dmamap_create failed; error %u\n", r);
1820                 goto fail_1;
1821         }
1822
1823         r = bus_dmamem_alloc(dma->dma_tag, (void**) &dma->dma_vaddr,
1824                              BUS_DMA_NOWAIT, &dma->dma_map);
1825         if (r != 0) {
1826                 device_printf(sc->sc_dev, "safe_dma_malloc: "
1827                         "bus_dmammem_alloc failed; size %zu, error %u\n",
1828                         size, r);
1829                 goto fail_2;
1830         }
1831
1832         r = bus_dmamap_load(dma->dma_tag, dma->dma_map, dma->dma_vaddr,
1833                             size,
1834                             safe_dmamap_cb,
1835                             &dma->dma_paddr,
1836                             mapflags | BUS_DMA_NOWAIT);
1837         if (r != 0) {
1838                 device_printf(sc->sc_dev, "safe_dma_malloc: "
1839                         "bus_dmamap_load failed; error %u\n", r);
1840                 goto fail_3;
1841         }
1842
1843         dma->dma_size = size;
1844         return (0);
1845
1846 fail_3:
1847         bus_dmamap_unload(dma->dma_tag, dma->dma_map);
1848 fail_2:
1849         bus_dmamem_free(dma->dma_tag, dma->dma_vaddr, dma->dma_map);
1850 fail_1:
1851         bus_dmamap_destroy(dma->dma_tag, dma->dma_map);
1852         bus_dma_tag_destroy(dma->dma_tag);
1853 fail_0:
1854         dma->dma_map = NULL;
1855         dma->dma_tag = NULL;
1856         return (r);
1857 }
1858
1859 static void
1860 safe_dma_free(struct safe_softc *sc, struct safe_dma_alloc *dma)
1861 {
1862         bus_dmamap_unload(dma->dma_tag, dma->dma_map);
1863         bus_dmamem_free(dma->dma_tag, dma->dma_vaddr, dma->dma_map);
1864         bus_dmamap_destroy(dma->dma_tag, dma->dma_map);
1865         bus_dma_tag_destroy(dma->dma_tag);
1866 }
1867
1868 /*
1869  * Resets the board.  Values in the regesters are left as is
1870  * from the reset (i.e. initial values are assigned elsewhere).
1871  */
1872 static void
1873 safe_reset_board(struct safe_softc *sc)
1874 {
1875         u_int32_t v;
1876         /*
1877          * Reset the device.  The manual says no delay
1878          * is needed between marking and clearing reset.
1879          */
1880         v = READ_REG(sc, SAFE_PE_DMACFG) &~
1881                 (SAFE_PE_DMACFG_PERESET | SAFE_PE_DMACFG_PDRRESET |
1882                  SAFE_PE_DMACFG_SGRESET);
1883         WRITE_REG(sc, SAFE_PE_DMACFG, v
1884                                     | SAFE_PE_DMACFG_PERESET
1885                                     | SAFE_PE_DMACFG_PDRRESET
1886                                     | SAFE_PE_DMACFG_SGRESET);
1887         WRITE_REG(sc, SAFE_PE_DMACFG, v);
1888 }
1889
1890 /*
1891  * Initialize registers we need to touch only once.
1892  */
1893 static void
1894 safe_init_board(struct safe_softc *sc)
1895 {
1896         u_int32_t v, dwords;
1897
1898         v = READ_REG(sc, SAFE_PE_DMACFG);
1899         v &=~ SAFE_PE_DMACFG_PEMODE;
1900         v |= SAFE_PE_DMACFG_FSENA               /* failsafe enable */
1901           |  SAFE_PE_DMACFG_GPRPCI              /* gather ring on PCI */
1902           |  SAFE_PE_DMACFG_SPRPCI              /* scatter ring on PCI */
1903           |  SAFE_PE_DMACFG_ESDESC              /* endian-swap descriptors */
1904           |  SAFE_PE_DMACFG_ESSA                /* endian-swap SA's */
1905           |  SAFE_PE_DMACFG_ESPDESC             /* endian-swap part. desc's */
1906           ;
1907         WRITE_REG(sc, SAFE_PE_DMACFG, v);
1908 #if 0
1909         /* XXX select byte swap based on host byte order */
1910         WRITE_REG(sc, SAFE_ENDIAN, 0x1b);
1911 #endif
1912         if (sc->sc_chiprev == SAFE_REV(1,0)) {
1913                 /*
1914                  * Avoid large PCI DMA transfers.  Rev 1.0 has a bug where
1915                  * "target mode transfers" done while the chip is DMA'ing
1916                  * >1020 bytes cause the hardware to lockup.  To avoid this
1917                  * we reduce the max PCI transfer size and use small source
1918                  * particle descriptors (<= 256 bytes).
1919                  */
1920                 WRITE_REG(sc, SAFE_DMA_CFG, 256);
1921                 device_printf(sc->sc_dev,
1922                         "Reduce max DMA size to %u words for rev %u.%u WAR\n",
1923                         (READ_REG(sc, SAFE_DMA_CFG)>>2) & 0xff,
1924                         SAFE_REV_MAJ(sc->sc_chiprev),
1925                         SAFE_REV_MIN(sc->sc_chiprev));
1926         }
1927
1928         /* NB: operands+results are overlaid */
1929         WRITE_REG(sc, SAFE_PE_PDRBASE, sc->sc_ringalloc.dma_paddr);
1930         WRITE_REG(sc, SAFE_PE_RDRBASE, sc->sc_ringalloc.dma_paddr);
1931         /*
1932          * Configure ring entry size and number of items in the ring.
1933          */
1934         KASSERT((sizeof(struct safe_ringentry) % sizeof(u_int32_t)) == 0,
1935                 ("PE ring entry not 32-bit aligned!"));
1936         dwords = sizeof(struct safe_ringentry) / sizeof(u_int32_t);
1937         WRITE_REG(sc, SAFE_PE_RINGCFG,
1938                 (dwords << SAFE_PE_RINGCFG_OFFSET_S) | SAFE_MAX_NQUEUE);
1939         WRITE_REG(sc, SAFE_PE_RINGPOLL, 0);     /* disable polling */
1940
1941         WRITE_REG(sc, SAFE_PE_GRNGBASE, sc->sc_spalloc.dma_paddr);
1942         WRITE_REG(sc, SAFE_PE_SRNGBASE, sc->sc_dpalloc.dma_paddr);
1943         WRITE_REG(sc, SAFE_PE_PARTSIZE,
1944                 (SAFE_TOTAL_DPART<<16) | SAFE_TOTAL_SPART);
1945         /*
1946          * NB: destination particles are fixed size.  We use
1947          *     an mbuf cluster and require all results go to
1948          *     clusters or smaller.
1949          */
1950         WRITE_REG(sc, SAFE_PE_PARTCFG, SAFE_MAX_DSIZE);
1951
1952         /* it's now safe to enable PE mode, do it */
1953         WRITE_REG(sc, SAFE_PE_DMACFG, v | SAFE_PE_DMACFG_PEMODE);
1954
1955         /*
1956          * Configure hardware to use level-triggered interrupts and
1957          * to interrupt after each descriptor is processed.
1958          */
1959         WRITE_REG(sc, SAFE_HI_CFG, SAFE_HI_CFG_LEVEL);
1960         WRITE_REG(sc, SAFE_HI_DESC_CNT, 1);
1961         WRITE_REG(sc, SAFE_HI_MASK, SAFE_INT_PE_DDONE | SAFE_INT_PE_ERROR);
1962 }
1963
1964 /*
1965  * Init PCI registers
1966  */
1967 static void
1968 safe_init_pciregs(device_t dev)
1969 {
1970 }
1971
1972 /*
1973  * Clean up after a chip crash.
1974  * It is assumed that the caller in splimp()
1975  */
1976 static void
1977 safe_cleanchip(struct safe_softc *sc)
1978 {
1979
1980         if (sc->sc_nqchip != 0) {
1981                 struct safe_ringentry *re = sc->sc_back;
1982
1983                 while (re != sc->sc_front) {
1984                         if (re->re_desc.d_csr != 0)
1985                                 safe_free_entry(sc, re);
1986                         if (++re == sc->sc_ringtop)
1987                                 re = sc->sc_ring;
1988                 }
1989                 sc->sc_back = re;
1990                 sc->sc_nqchip = 0;
1991         }
1992 }
1993
1994 /*
1995  * free a safe_q
1996  * It is assumed that the caller is within splimp().
1997  */
1998 static int
1999 safe_free_entry(struct safe_softc *sc, struct safe_ringentry *re)
2000 {
2001         struct cryptop *crp;
2002
2003         /*
2004          * Free header MCR
2005          */
2006         if ((re->re_dst_m != NULL) && (re->re_src_m != re->re_dst_m))
2007                 m_freem(re->re_dst_m);
2008
2009         crp = (struct cryptop *)re->re_crp;
2010
2011         re->re_desc.d_csr = 0;
2012
2013         crp->crp_etype = EFAULT;
2014         crypto_done(crp);
2015         return(0);
2016 }
2017
2018 /*
2019  * Routine to reset the chip and clean up.
2020  * It is assumed that the caller is in splimp()
2021  */
2022 static void
2023 safe_totalreset(struct safe_softc *sc)
2024 {
2025         safe_reset_board(sc);
2026         safe_init_board(sc);
2027         safe_cleanchip(sc);
2028 }
2029
2030 /*
2031  * Is the operand suitable aligned for direct DMA.  Each
2032  * segment must be aligned on a 32-bit boundary and all
2033  * but the last segment must be a multiple of 4 bytes.
2034  */
2035 static int
2036 safe_dmamap_aligned(const struct safe_operand *op)
2037 {
2038         int i;
2039
2040         for (i = 0; i < op->nsegs; i++) {
2041                 if (op->segs[i].ds_addr & 3)
2042                         return (0);
2043                 if (i != (op->nsegs - 1) && (op->segs[i].ds_len & 3))
2044                         return (0);
2045         }
2046         return (1);
2047 }
2048
2049 /*
2050  * Is the operand suitable for direct DMA as the destination
2051  * of an operation.  The hardware requires that each ``particle''
2052  * but the last in an operation result have the same size.  We
2053  * fix that size at SAFE_MAX_DSIZE bytes.  This routine returns
2054  * 0 if some segment is not a multiple of of this size, 1 if all
2055  * segments are exactly this size, or 2 if segments are at worst
2056  * a multple of this size.
2057  */
2058 static int
2059 safe_dmamap_uniform(const struct safe_operand *op)
2060 {
2061         int result = 1;
2062
2063         if (op->nsegs > 0) {
2064                 int i;
2065
2066                 for (i = 0; i < op->nsegs-1; i++) {
2067                         if (op->segs[i].ds_len % SAFE_MAX_DSIZE)
2068                                 return (0);
2069                         if (op->segs[i].ds_len != SAFE_MAX_DSIZE)
2070                                 result = 2;
2071                 }
2072         }
2073         return (result);
2074 }
2075
2076 #ifdef SAFE_DEBUG
2077 static void
2078 safe_dump_dmastatus(struct safe_softc *sc, const char *tag)
2079 {
2080         kprintf("%s: ENDIAN 0x%x SRC 0x%x DST 0x%x STAT 0x%x\n"
2081                 , tag
2082                 , READ_REG(sc, SAFE_DMA_ENDIAN)
2083                 , READ_REG(sc, SAFE_DMA_SRCADDR)
2084                 , READ_REG(sc, SAFE_DMA_DSTADDR)
2085                 , READ_REG(sc, SAFE_DMA_STAT)
2086         );
2087 }
2088
2089 static void
2090 safe_dump_intrstate(struct safe_softc *sc, const char *tag)
2091 {
2092         kprintf("%s: HI_CFG 0x%x HI_MASK 0x%x HI_DESC_CNT 0x%x HU_STAT 0x%x HM_STAT 0x%x\n"
2093                 , tag
2094                 , READ_REG(sc, SAFE_HI_CFG)
2095                 , READ_REG(sc, SAFE_HI_MASK)
2096                 , READ_REG(sc, SAFE_HI_DESC_CNT)
2097                 , READ_REG(sc, SAFE_HU_STAT)
2098                 , READ_REG(sc, SAFE_HM_STAT)
2099         );
2100 }
2101
2102 static void
2103 safe_dump_ringstate(struct safe_softc *sc, const char *tag)
2104 {
2105         u_int32_t estat = READ_REG(sc, SAFE_PE_ERNGSTAT);
2106
2107         /* NB: assume caller has lock on ring */
2108         kprintf("%s: ERNGSTAT %x (next %u) back %lu front %lu\n",
2109                 tag,
2110                 estat, (estat >> SAFE_PE_ERNGSTAT_NEXT_S),
2111                 (unsigned long)(sc->sc_back - sc->sc_ring),
2112                 (unsigned long)(sc->sc_front - sc->sc_ring));
2113 }
2114
2115 static void
2116 safe_dump_request(struct safe_softc *sc, const char* tag, struct safe_ringentry *re)
2117 {
2118         int ix, nsegs;
2119
2120         ix = re - sc->sc_ring;
2121         kprintf("%s: %p (%u): csr %x src %x dst %x sa %x len %x\n"
2122                 , tag
2123                 , re, ix
2124                 , re->re_desc.d_csr
2125                 , re->re_desc.d_src
2126                 , re->re_desc.d_dst
2127                 , re->re_desc.d_sa
2128                 , re->re_desc.d_len
2129         );
2130         if (re->re_src.nsegs > 1) {
2131                 ix = (re->re_desc.d_src - sc->sc_spalloc.dma_paddr) /
2132                         sizeof(struct safe_pdesc);
2133                 for (nsegs = re->re_src.nsegs; nsegs; nsegs--) {
2134                         kprintf(" spd[%u] %p: %p size %u flags %x"
2135                                 , ix, &sc->sc_spring[ix]
2136                                 , (caddr_t)(uintptr_t) sc->sc_spring[ix].pd_addr
2137                                 , sc->sc_spring[ix].pd_size
2138                                 , sc->sc_spring[ix].pd_flags
2139                         );
2140                         if (sc->sc_spring[ix].pd_size == 0)
2141                                 kprintf(" (zero!)");
2142                         kprintf("\n");
2143                         if (++ix == SAFE_TOTAL_SPART)
2144                                 ix = 0;
2145                 }
2146         }
2147         if (re->re_dst.nsegs > 1) {
2148                 ix = (re->re_desc.d_dst - sc->sc_dpalloc.dma_paddr) /
2149                         sizeof(struct safe_pdesc);
2150                 for (nsegs = re->re_dst.nsegs; nsegs; nsegs--) {
2151                         kprintf(" dpd[%u] %p: %p flags %x\n"
2152                                 , ix, &sc->sc_dpring[ix]
2153                                 , (caddr_t)(uintptr_t) sc->sc_dpring[ix].pd_addr
2154                                 , sc->sc_dpring[ix].pd_flags
2155                         );
2156                         if (++ix == SAFE_TOTAL_DPART)
2157                                 ix = 0;
2158                 }
2159         }
2160         kprintf("sa: cmd0 %08x cmd1 %08x staterec %x\n",
2161                 re->re_sa.sa_cmd0, re->re_sa.sa_cmd1, re->re_sa.sa_staterec);
2162         kprintf("sa: key %x %x %x %x %x %x %x %x\n"
2163                 , re->re_sa.sa_key[0]
2164                 , re->re_sa.sa_key[1]
2165                 , re->re_sa.sa_key[2]
2166                 , re->re_sa.sa_key[3]
2167                 , re->re_sa.sa_key[4]
2168                 , re->re_sa.sa_key[5]
2169                 , re->re_sa.sa_key[6]
2170                 , re->re_sa.sa_key[7]
2171         );
2172         kprintf("sa: indigest %x %x %x %x %x\n"
2173                 , re->re_sa.sa_indigest[0]
2174                 , re->re_sa.sa_indigest[1]
2175                 , re->re_sa.sa_indigest[2]
2176                 , re->re_sa.sa_indigest[3]
2177                 , re->re_sa.sa_indigest[4]
2178         );
2179         kprintf("sa: outdigest %x %x %x %x %x\n"
2180                 , re->re_sa.sa_outdigest[0]
2181                 , re->re_sa.sa_outdigest[1]
2182                 , re->re_sa.sa_outdigest[2]
2183                 , re->re_sa.sa_outdigest[3]
2184                 , re->re_sa.sa_outdigest[4]
2185         );
2186         kprintf("sr: iv %x %x %x %x\n"
2187                 , re->re_sastate.sa_saved_iv[0]
2188                 , re->re_sastate.sa_saved_iv[1]
2189                 , re->re_sastate.sa_saved_iv[2]
2190                 , re->re_sastate.sa_saved_iv[3]
2191         );
2192         kprintf("sr: hashbc %u indigest %x %x %x %x %x\n"
2193                 , re->re_sastate.sa_saved_hashbc
2194                 , re->re_sastate.sa_saved_indigest[0]
2195                 , re->re_sastate.sa_saved_indigest[1]
2196                 , re->re_sastate.sa_saved_indigest[2]
2197                 , re->re_sastate.sa_saved_indigest[3]
2198                 , re->re_sastate.sa_saved_indigest[4]
2199         );
2200 }
2201
2202 static void
2203 safe_dump_ring(struct safe_softc *sc, const char *tag)
2204 {
2205         lockmgr(&sc->sc_ringlock, LK_EXCLUSIVE);
2206         kprintf("\nSafeNet Ring State:\n");
2207         safe_dump_intrstate(sc, tag);
2208         safe_dump_dmastatus(sc, tag);
2209         safe_dump_ringstate(sc, tag);
2210         if (sc->sc_nqchip) {
2211                 struct safe_ringentry *re = sc->sc_back;
2212                 do {
2213                         safe_dump_request(sc, tag, re);
2214                         if (++re == sc->sc_ringtop)
2215                                 re = sc->sc_ring;
2216                 } while (re != sc->sc_front);
2217         }
2218         lockmgr(&sc->sc_ringlock, LK_RELEASE);
2219 }
2220
2221 static int
2222 sysctl_hw_safe_dump(SYSCTL_HANDLER_ARGS)
2223 {
2224         char dmode[64];
2225         int error;
2226
2227         strncpy(dmode, "", sizeof(dmode) - 1);
2228         dmode[sizeof(dmode) - 1] = '\0';
2229         error = sysctl_handle_string(oidp, &dmode[0], sizeof(dmode), req);
2230
2231         if (error == 0 && req->newptr != NULL) {
2232                 struct safe_softc *sc = safec;
2233
2234                 if (!sc)
2235                         return EINVAL;
2236                 if (strncmp(dmode, "dma", 3) == 0)
2237                         safe_dump_dmastatus(sc, "safe0");
2238                 else if (strncmp(dmode, "int", 3) == 0)
2239                         safe_dump_intrstate(sc, "safe0");
2240                 else if (strncmp(dmode, "ring", 4) == 0)
2241                         safe_dump_ring(sc, "safe0");
2242                 else
2243                         return EINVAL;
2244         }
2245         return error;
2246 }
2247 SYSCTL_PROC(_hw_safe, OID_AUTO, dump, CTLTYPE_STRING | CTLFLAG_RW,
2248         0, 0, sysctl_hw_safe_dump, "A", "Dump driver state");
2249 #endif /* SAFE_DEBUG */