| 1 | /*- |
| 2 | * Copyright (c) 2001-2002 Luigi Rizzo |
| 3 | * |
| 4 | * Supported by: the Xorp Project (www.xorp.org) |
| 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 AUTHORS 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 AUTHORS 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/kern/kern_poll.c,v 1.2.2.4 2002/06/27 23:26:33 luigi Exp $ |
| 28 | */ |
| 29 | |
| 30 | #include "opt_ifpoll.h" |
| 31 | |
| 32 | #include <sys/param.h> |
| 33 | #include <sys/kernel.h> |
| 34 | #include <sys/ktr.h> |
| 35 | #include <sys/malloc.h> |
| 36 | #include <sys/serialize.h> |
| 37 | #include <sys/socket.h> |
| 38 | #include <sys/sysctl.h> |
| 39 | |
| 40 | #include <sys/thread2.h> |
| 41 | #include <sys/msgport2.h> |
| 42 | |
| 43 | #include <machine/atomic.h> |
| 44 | #include <machine/clock.h> |
| 45 | #include <machine/smp.h> |
| 46 | |
| 47 | #include <net/if.h> |
| 48 | #include <net/if_poll.h> |
| 49 | #include <net/netmsg2.h> |
| 50 | |
| 51 | /* |
| 52 | * Polling support for network device drivers. |
| 53 | * |
| 54 | * Drivers which support this feature try to register one status polling |
| 55 | * handler and several TX/RX polling handlers with the polling code. |
| 56 | * If interface's if_qpoll is called with non-NULL second argument, then |
| 57 | * a register operation is requested, else a deregister operation is |
| 58 | * requested. If the requested operation is "register", driver should |
| 59 | * setup the ifpoll_info passed in accoding its own needs: |
| 60 | * ifpoll_info.ifpi_status.status_func == NULL |
| 61 | * No status polling handler will be installed on CPU(0) |
| 62 | * ifpoll_info.ifpi_rx[n].poll_func == NULL |
| 63 | * No RX polling handler will be installed on CPU(n) |
| 64 | * ifpoll_info.ifpi_tx[n].poll_func == NULL |
| 65 | * No TX polling handler will be installed on CPU(n) |
| 66 | * |
| 67 | * All of the registered polling handlers are called only if the interface |
| 68 | * is marked as 'IFF_RUNNING and IFF_NPOLLING'. However, the interface's |
| 69 | * register and deregister function (ifnet.if_qpoll) will be called even |
| 70 | * if interface is not marked with 'IFF_RUNNING'. |
| 71 | * |
| 72 | * If registration is successful, the driver must disable interrupts, |
| 73 | * and further I/O is performed through the TX/RX polling handler, which |
| 74 | * are invoked (at least once per clock tick) with 3 arguments: the "arg" |
| 75 | * passed at register time, a struct ifnet pointer, and a "count" limit. |
| 76 | * The registered serializer will be held before calling the related |
| 77 | * polling handler. |
| 78 | * |
| 79 | * The count limit specifies how much work the handler can do during the |
| 80 | * call -- typically this is the number of packets to be received, or |
| 81 | * transmitted, etc. (drivers are free to interpret this number, as long |
| 82 | * as the max time spent in the function grows roughly linearly with the |
| 83 | * count). |
| 84 | * |
| 85 | * A second variable controls the sharing of CPU between polling/kernel |
| 86 | * network processing, and other activities (typically userlevel tasks): |
| 87 | * net.ifpoll.X.{rx,tx}.user_frac (between 0 and 100, default 50) sets the |
| 88 | * share of CPU allocated to user tasks. CPU is allocated proportionally |
| 89 | * to the shares, by dynamically adjusting the "count" (poll_burst). |
| 90 | * |
| 91 | * Other parameters can should be left to their default values. |
| 92 | * The following constraints hold |
| 93 | * |
| 94 | * 1 <= poll_burst <= poll_burst_max |
| 95 | * 1 <= poll_each_burst <= poll_burst_max |
| 96 | * MIN_POLL_BURST_MAX <= poll_burst_max <= MAX_POLL_BURST_MAX |
| 97 | */ |
| 98 | |
| 99 | #define IFPOLL_LIST_LEN 128 |
| 100 | #define IFPOLL_FREQ_MAX 30000 |
| 101 | |
| 102 | #define MIN_IOPOLL_BURST_MAX 10 |
| 103 | #define MAX_IOPOLL_BURST_MAX 1000 |
| 104 | #define IOPOLL_BURST_MAX 150 /* good for 100Mbit net and HZ=1000 */ |
| 105 | |
| 106 | #define IOPOLL_EACH_BURST 5 |
| 107 | |
| 108 | #define IFPOLL_FREQ_DEFAULT 2000 |
| 109 | #define IOPOLL_FREQ_DEFAULT IFPOLL_FREQ_DEFAULT |
| 110 | #define STPOLL_FREQ_DEFAULT 100 |
| 111 | |
| 112 | #define IFPOLL_TXFRAC_DEFAULT 1 |
| 113 | #define IFPOLL_STFRAC_DEFAULT 20 |
| 114 | |
| 115 | #define IFPOLL_RX 0x1 |
| 116 | #define IFPOLL_TX 0x2 |
| 117 | |
| 118 | union ifpoll_time { |
| 119 | struct timeval tv; |
| 120 | uint64_t tsc; |
| 121 | }; |
| 122 | |
| 123 | struct iopoll_rec { |
| 124 | struct lwkt_serialize *serializer; |
| 125 | struct ifnet *ifp; |
| 126 | void *arg; |
| 127 | ifpoll_iofn_t poll_func; |
| 128 | }; |
| 129 | |
| 130 | struct iopoll_ctx { |
| 131 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 132 | struct systimer pollclock; |
| 133 | #endif |
| 134 | |
| 135 | union ifpoll_time prev_t; |
| 136 | uint32_t short_ticks; /* statistics */ |
| 137 | uint32_t lost_polls; /* statistics */ |
| 138 | uint32_t suspect; /* statistics */ |
| 139 | uint32_t stalled; /* statistics */ |
| 140 | uint32_t pending_polls; /* state */ |
| 141 | |
| 142 | struct netmsg poll_netmsg; |
| 143 | |
| 144 | int poll_cpuid; |
| 145 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 146 | int pollhz; /* tunable */ |
| 147 | #else |
| 148 | int poll_type; /* IFPOLL_{RX,TX} */ |
| 149 | #endif |
| 150 | uint32_t phase; /* state */ |
| 151 | int residual_burst; /* state */ |
| 152 | uint32_t poll_each_burst; /* tunable */ |
| 153 | union ifpoll_time poll_start_t; /* state */ |
| 154 | |
| 155 | uint32_t poll_handlers; /* next free entry in pr[]. */ |
| 156 | struct iopoll_rec pr[IFPOLL_LIST_LEN]; |
| 157 | |
| 158 | struct netmsg poll_more_netmsg; |
| 159 | |
| 160 | uint32_t poll_burst; /* state */ |
| 161 | uint32_t poll_burst_max; /* tunable */ |
| 162 | uint32_t user_frac; /* tunable */ |
| 163 | uint32_t kern_frac; /* state */ |
| 164 | |
| 165 | struct sysctl_ctx_list poll_sysctl_ctx; |
| 166 | struct sysctl_oid *poll_sysctl_tree; |
| 167 | } __cachealign; |
| 168 | |
| 169 | struct iopoll_comm { |
| 170 | struct sysctl_ctx_list sysctl_ctx; |
| 171 | struct sysctl_oid *sysctl_tree; |
| 172 | } __cachealign; |
| 173 | |
| 174 | struct stpoll_rec { |
| 175 | struct lwkt_serialize *serializer; |
| 176 | struct ifnet *ifp; |
| 177 | ifpoll_stfn_t status_func; |
| 178 | }; |
| 179 | |
| 180 | struct stpoll_ctx { |
| 181 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 182 | struct systimer pollclock; |
| 183 | #endif |
| 184 | |
| 185 | struct netmsg poll_netmsg; |
| 186 | |
| 187 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 188 | int pollhz; /* tunable */ |
| 189 | #endif |
| 190 | uint32_t poll_handlers; /* next free entry in pr[]. */ |
| 191 | struct stpoll_rec pr[IFPOLL_LIST_LEN]; |
| 192 | |
| 193 | struct sysctl_ctx_list poll_sysctl_ctx; |
| 194 | struct sysctl_oid *poll_sysctl_tree; |
| 195 | }; |
| 196 | |
| 197 | struct iopoll_sysctl_netmsg { |
| 198 | struct netmsg nmsg; |
| 199 | struct iopoll_ctx *ctx; |
| 200 | }; |
| 201 | |
| 202 | #ifndef IFPOLL_MULTI_SYSTIMER |
| 203 | |
| 204 | struct ifpoll_data { |
| 205 | struct systimer clock; |
| 206 | int txfrac_count; |
| 207 | int stfrac_count; |
| 208 | u_int tx_cpumask; |
| 209 | u_int rx_cpumask; |
| 210 | } __cachealign; |
| 211 | |
| 212 | #endif |
| 213 | |
| 214 | static struct stpoll_ctx stpoll_context; |
| 215 | static struct iopoll_comm *iopoll_common[IFPOLL_CTX_MAX]; |
| 216 | static struct iopoll_ctx *rxpoll_context[IFPOLL_CTX_MAX]; |
| 217 | static struct iopoll_ctx *txpoll_context[IFPOLL_CTX_MAX]; |
| 218 | |
| 219 | SYSCTL_NODE(_net, OID_AUTO, ifpoll, CTLFLAG_RW, 0, |
| 220 | "Network device polling parameters"); |
| 221 | |
| 222 | static int ifpoll_ncpus = IFPOLL_CTX_MAX; |
| 223 | |
| 224 | static int iopoll_burst_max = IOPOLL_BURST_MAX; |
| 225 | static int iopoll_each_burst = IOPOLL_EACH_BURST; |
| 226 | |
| 227 | TUNABLE_INT("net.ifpoll.burst_max", &iopoll_burst_max); |
| 228 | TUNABLE_INT("net.ifpoll.each_burst", &iopoll_each_burst); |
| 229 | |
| 230 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 231 | |
| 232 | static int stpoll_hz = STPOLL_FREQ_DEFAULT; |
| 233 | static int iopoll_hz = IOPOLL_FREQ_DEFAULT; |
| 234 | |
| 235 | TUNABLE_INT("net.ifpoll.stpoll_hz", &stpoll_hz); |
| 236 | TUNABLE_INT("net.ifpoll.iopoll_hz", &iopoll_hz); |
| 237 | |
| 238 | #else /* !IFPOLL_MULTI_SYSTIMER */ |
| 239 | |
| 240 | static struct ifpoll_data ifpoll0; |
| 241 | static int ifpoll_pollhz = IFPOLL_FREQ_DEFAULT; |
| 242 | static int ifpoll_stfrac = IFPOLL_STFRAC_DEFAULT; |
| 243 | static int ifpoll_txfrac = IFPOLL_TXFRAC_DEFAULT; |
| 244 | static int ifpoll_handlers; |
| 245 | |
| 246 | TUNABLE_INT("net.ifpoll.pollhz", &ifpoll_pollhz); |
| 247 | TUNABLE_INT("net.ifpoll.status_frac", &ifpoll_stfrac); |
| 248 | TUNABLE_INT("net.ifpoll.tx_frac", &ifpoll_txfrac); |
| 249 | |
| 250 | static void sysctl_ifpollhz_handler(struct netmsg *); |
| 251 | static int sysctl_ifpollhz(SYSCTL_HANDLER_ARGS); |
| 252 | |
| 253 | SYSCTL_PROC(_net_ifpoll, OID_AUTO, pollhz, CTLTYPE_INT | CTLFLAG_RW, |
| 254 | 0, 0, sysctl_ifpollhz, "I", "Polling frequency"); |
| 255 | SYSCTL_INT(_net_ifpoll, OID_AUTO, tx_frac, CTLFLAG_RW, |
| 256 | &ifpoll_txfrac, 0, "Every this many cycles poll transmit"); |
| 257 | SYSCTL_INT(_net_ifpoll, OID_AUTO, st_frac, CTLFLAG_RW, |
| 258 | &ifpoll_stfrac, 0, "Every this many cycles poll status"); |
| 259 | |
| 260 | #endif /* IFPOLL_MULTI_SYSTIMER */ |
| 261 | |
| 262 | void ifpoll_init_pcpu(int); |
| 263 | |
| 264 | #ifndef IFPOLL_MULTI_SYSTIMER |
| 265 | static void ifpoll_start_handler(struct netmsg *); |
| 266 | static void ifpoll_stop_handler(struct netmsg *); |
| 267 | static void ifpoll_handler_addevent(void); |
| 268 | static void ifpoll_handler_delevent(void); |
| 269 | static void ifpoll_ipi_handler(void *, int); |
| 270 | static void ifpoll_systimer(systimer_t, struct intrframe *); |
| 271 | #endif |
| 272 | |
| 273 | static void ifpoll_register_handler(struct netmsg *); |
| 274 | static void ifpoll_deregister_handler(struct netmsg *); |
| 275 | |
| 276 | /* |
| 277 | * Status polling |
| 278 | */ |
| 279 | static void stpoll_init(void); |
| 280 | static void stpoll_handler(struct netmsg *); |
| 281 | static void stpoll_clock(struct stpoll_ctx *); |
| 282 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 283 | static void stpoll_systimer(systimer_t, struct intrframe *); |
| 284 | #endif |
| 285 | static int stpoll_register(struct ifnet *, const struct ifpoll_status *); |
| 286 | static int stpoll_deregister(struct ifnet *); |
| 287 | |
| 288 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 289 | static void sysctl_stpollhz_handler(struct netmsg *); |
| 290 | static int sysctl_stpollhz(SYSCTL_HANDLER_ARGS); |
| 291 | #endif |
| 292 | |
| 293 | /* |
| 294 | * RX/TX polling |
| 295 | */ |
| 296 | static struct iopoll_ctx *iopoll_ctx_create(int, int); |
| 297 | static struct iopoll_comm *iopoll_comm_create(int); |
| 298 | static void iopoll_init(int); |
| 299 | static void iopoll_handler(struct netmsg *); |
| 300 | static void iopollmore_handler(struct netmsg *); |
| 301 | static void iopoll_clock(struct iopoll_ctx *); |
| 302 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 303 | static void iopoll_systimer(systimer_t, struct intrframe *); |
| 304 | #endif |
| 305 | static int iopoll_register(struct ifnet *, struct iopoll_ctx *, |
| 306 | const struct ifpoll_io *); |
| 307 | static int iopoll_deregister(struct ifnet *, struct iopoll_ctx *); |
| 308 | |
| 309 | static void iopoll_add_sysctl(struct sysctl_ctx_list *, |
| 310 | struct sysctl_oid_list *, struct iopoll_ctx *); |
| 311 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 312 | static void sysctl_iopollhz_handler(struct netmsg *); |
| 313 | static int sysctl_iopollhz(SYSCTL_HANDLER_ARGS); |
| 314 | #endif |
| 315 | static void sysctl_burstmax_handler(struct netmsg *); |
| 316 | static int sysctl_burstmax(SYSCTL_HANDLER_ARGS); |
| 317 | static void sysctl_eachburst_handler(struct netmsg *); |
| 318 | static int sysctl_eachburst(SYSCTL_HANDLER_ARGS); |
| 319 | |
| 320 | static __inline void |
| 321 | ifpoll_sendmsg_oncpu(struct netmsg *msg) |
| 322 | { |
| 323 | if (msg->nm_lmsg.ms_flags & MSGF_DONE) |
| 324 | ifnet_sendmsg(&msg->nm_lmsg, mycpuid); |
| 325 | } |
| 326 | |
| 327 | static __inline void |
| 328 | sched_stpoll(struct stpoll_ctx *st_ctx) |
| 329 | { |
| 330 | ifpoll_sendmsg_oncpu(&st_ctx->poll_netmsg); |
| 331 | } |
| 332 | |
| 333 | static __inline void |
| 334 | sched_iopoll(struct iopoll_ctx *io_ctx) |
| 335 | { |
| 336 | ifpoll_sendmsg_oncpu(&io_ctx->poll_netmsg); |
| 337 | } |
| 338 | |
| 339 | static __inline void |
| 340 | sched_iopollmore(struct iopoll_ctx *io_ctx) |
| 341 | { |
| 342 | ifpoll_sendmsg_oncpu(&io_ctx->poll_more_netmsg); |
| 343 | } |
| 344 | |
| 345 | static __inline void |
| 346 | ifpoll_time_get(union ifpoll_time *t) |
| 347 | { |
| 348 | if (tsc_present) |
| 349 | t->tsc = rdtsc(); |
| 350 | else |
| 351 | microuptime(&t->tv); |
| 352 | } |
| 353 | |
| 354 | /* Return time diff in us */ |
| 355 | static __inline int |
| 356 | ifpoll_time_diff(const union ifpoll_time *s, const union ifpoll_time *e) |
| 357 | { |
| 358 | if (tsc_present) { |
| 359 | return (((e->tsc - s->tsc) * 1000000) / tsc_frequency); |
| 360 | } else { |
| 361 | return ((e->tv.tv_usec - s->tv.tv_usec) + |
| 362 | (e->tv.tv_sec - s->tv.tv_sec) * 1000000); |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | /* |
| 367 | * Initialize per-cpu qpolling(4) context. Called from kern_clock.c: |
| 368 | */ |
| 369 | void |
| 370 | ifpoll_init_pcpu(int cpuid) |
| 371 | { |
| 372 | if (cpuid >= IFPOLL_CTX_MAX) { |
| 373 | return; |
| 374 | } else if (cpuid == 0) { |
| 375 | if (ifpoll_ncpus > ncpus) |
| 376 | ifpoll_ncpus = ncpus; |
| 377 | kprintf("ifpoll_ncpus %d\n", ifpoll_ncpus); |
| 378 | |
| 379 | #ifndef IFPOLL_MULTI_SYSTIMER |
| 380 | systimer_init_periodic_nq(&ifpoll0.clock, |
| 381 | ifpoll_systimer, NULL, 1); |
| 382 | #endif |
| 383 | |
| 384 | stpoll_init(); |
| 385 | } |
| 386 | iopoll_init(cpuid); |
| 387 | } |
| 388 | |
| 389 | #ifndef IFPOLL_MULTI_SYSTIMER |
| 390 | |
| 391 | #ifdef SMP |
| 392 | static void |
| 393 | ifpoll_ipi_handler(void *arg __unused, int poll) |
| 394 | { |
| 395 | KKASSERT(mycpuid < ifpoll_ncpus); |
| 396 | |
| 397 | if (poll & IFPOLL_TX) |
| 398 | iopoll_clock(txpoll_context[mycpuid]); |
| 399 | if (poll & IFPOLL_RX) |
| 400 | iopoll_clock(rxpoll_context[mycpuid]); |
| 401 | } |
| 402 | #endif /* SMP */ |
| 403 | |
| 404 | static void |
| 405 | ifpoll_systimer(systimer_t info __unused, struct intrframe *frame __unused) |
| 406 | { |
| 407 | #ifdef SMP |
| 408 | uint32_t cpumask = 0; |
| 409 | #endif |
| 410 | |
| 411 | KKASSERT(mycpuid == 0); |
| 412 | |
| 413 | if (ifpoll0.stfrac_count-- == 0) { |
| 414 | ifpoll0.stfrac_count = ifpoll_stfrac; |
| 415 | stpoll_clock(&stpoll_context); |
| 416 | } |
| 417 | |
| 418 | if (ifpoll0.txfrac_count-- == 0) { |
| 419 | ifpoll0.txfrac_count = ifpoll_txfrac; |
| 420 | |
| 421 | #ifdef SMP |
| 422 | /* TODO: We may try to piggyback TX on RX */ |
| 423 | cpumask = smp_active_mask & ifpoll0.tx_cpumask; |
| 424 | if (cpumask != 0) { |
| 425 | lwkt_send_ipiq2_mask(cpumask, ifpoll_ipi_handler, |
| 426 | NULL, IFPOLL_TX); |
| 427 | } |
| 428 | #else |
| 429 | iopoll_clock(txpoll_context[0]); |
| 430 | #endif |
| 431 | } |
| 432 | |
| 433 | #ifdef SMP |
| 434 | cpumask = smp_active_mask & ifpoll0.rx_cpumask; |
| 435 | if (cpumask != 0) { |
| 436 | lwkt_send_ipiq2_mask(cpumask, ifpoll_ipi_handler, |
| 437 | NULL, IFPOLL_RX); |
| 438 | } |
| 439 | #else |
| 440 | iopoll_clock(rxpoll_context[0]); |
| 441 | #endif |
| 442 | } |
| 443 | |
| 444 | static void |
| 445 | ifpoll_start_handler(struct netmsg *nmsg) |
| 446 | { |
| 447 | KKASSERT(&curthread->td_msgport == ifnet_portfn(0)); |
| 448 | |
| 449 | kprintf("ifpoll: start\n"); |
| 450 | systimer_adjust_periodic(&ifpoll0.clock, ifpoll_pollhz); |
| 451 | lwkt_replymsg(&nmsg->nm_lmsg, 0); |
| 452 | } |
| 453 | |
| 454 | static void |
| 455 | ifpoll_stop_handler(struct netmsg *nmsg) |
| 456 | { |
| 457 | KKASSERT(&curthread->td_msgport == ifnet_portfn(0)); |
| 458 | |
| 459 | kprintf("ifpoll: stop\n"); |
| 460 | systimer_adjust_periodic(&ifpoll0.clock, 1); |
| 461 | lwkt_replymsg(&nmsg->nm_lmsg, 0); |
| 462 | } |
| 463 | |
| 464 | static void |
| 465 | ifpoll_handler_addevent(void) |
| 466 | { |
| 467 | if (atomic_fetchadd_int(&ifpoll_handlers, 1) == 0) { |
| 468 | struct netmsg *nmsg; |
| 469 | |
| 470 | /* Start systimer */ |
| 471 | nmsg = kmalloc(sizeof(*nmsg), M_LWKTMSG, M_WAITOK); |
| 472 | netmsg_init(nmsg, &netisr_afree_rport, 0, ifpoll_start_handler); |
| 473 | ifnet_sendmsg(&nmsg->nm_lmsg, 0); |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | static void |
| 478 | ifpoll_handler_delevent(void) |
| 479 | { |
| 480 | KKASSERT(ifpoll_handlers > 0); |
| 481 | if (atomic_fetchadd_int(&ifpoll_handlers, -1) == 1) { |
| 482 | struct netmsg *nmsg; |
| 483 | |
| 484 | /* Stop systimer */ |
| 485 | nmsg = kmalloc(sizeof(*nmsg), M_LWKTMSG, M_WAITOK); |
| 486 | netmsg_init(nmsg, &netisr_afree_rport, 0, ifpoll_stop_handler); |
| 487 | ifnet_sendmsg(&nmsg->nm_lmsg, 0); |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | static void |
| 492 | sysctl_ifpollhz_handler(struct netmsg *nmsg) |
| 493 | { |
| 494 | KKASSERT(&curthread->td_msgport == ifnet_portfn(0)); |
| 495 | |
| 496 | /* |
| 497 | * If there is no handler registered, don't adjust polling |
| 498 | * systimer frequency; polling systimer frequency will be |
| 499 | * adjusted once there is registered handler. |
| 500 | */ |
| 501 | ifpoll_pollhz = nmsg->nm_lmsg.u.ms_result; |
| 502 | if (ifpoll_handlers) |
| 503 | systimer_adjust_periodic(&ifpoll0.clock, ifpoll_pollhz); |
| 504 | |
| 505 | lwkt_replymsg(&nmsg->nm_lmsg, 0); |
| 506 | } |
| 507 | |
| 508 | static int |
| 509 | sysctl_ifpollhz(SYSCTL_HANDLER_ARGS) |
| 510 | { |
| 511 | struct netmsg nmsg; |
| 512 | int error, phz; |
| 513 | |
| 514 | phz = ifpoll_pollhz; |
| 515 | error = sysctl_handle_int(oidp, &phz, 0, req); |
| 516 | if (error || req->newptr == NULL) |
| 517 | return error; |
| 518 | if (phz <= 0) |
| 519 | return EINVAL; |
| 520 | else if (phz > IFPOLL_FREQ_MAX) |
| 521 | phz = IFPOLL_FREQ_MAX; |
| 522 | |
| 523 | netmsg_init(&nmsg, &curthread->td_msgport, MSGF_MPSAFE, |
| 524 | sysctl_ifpollhz_handler); |
| 525 | nmsg.nm_lmsg.u.ms_result = phz; |
| 526 | |
| 527 | return ifnet_domsg(&nmsg.nm_lmsg, 0); |
| 528 | } |
| 529 | |
| 530 | #endif /* !IFPOLL_MULTI_SYSTIMER */ |
| 531 | |
| 532 | int |
| 533 | ifpoll_register(struct ifnet *ifp) |
| 534 | { |
| 535 | struct ifpoll_info info; |
| 536 | struct netmsg nmsg; |
| 537 | int error; |
| 538 | |
| 539 | if (ifp->if_qpoll == NULL) { |
| 540 | /* Device does not support polling */ |
| 541 | return EOPNOTSUPP; |
| 542 | } |
| 543 | |
| 544 | /* |
| 545 | * Attempt to register. Interlock with IFF_NPOLLING. |
| 546 | */ |
| 547 | |
| 548 | ifnet_serialize_all(ifp); |
| 549 | |
| 550 | if (ifp->if_flags & IFF_NPOLLING) { |
| 551 | /* Already polling */ |
| 552 | ifnet_deserialize_all(ifp); |
| 553 | return EBUSY; |
| 554 | } |
| 555 | |
| 556 | bzero(&info, sizeof(info)); |
| 557 | info.ifpi_ifp = ifp; |
| 558 | |
| 559 | ifp->if_flags |= IFF_NPOLLING; |
| 560 | ifp->if_qpoll(ifp, &info); |
| 561 | |
| 562 | ifnet_deserialize_all(ifp); |
| 563 | |
| 564 | netmsg_init(&nmsg, &curthread->td_msgport, MSGF_MPSAFE, |
| 565 | ifpoll_register_handler); |
| 566 | nmsg.nm_lmsg.u.ms_resultp = &info; |
| 567 | |
| 568 | error = ifnet_domsg(&nmsg.nm_lmsg, 0); |
| 569 | if (error) { |
| 570 | if (!ifpoll_deregister(ifp)) { |
| 571 | if_printf(ifp, "ifpoll_register: " |
| 572 | "ifpoll_deregister failed!\n"); |
| 573 | } |
| 574 | } |
| 575 | return error; |
| 576 | } |
| 577 | |
| 578 | int |
| 579 | ifpoll_deregister(struct ifnet *ifp) |
| 580 | { |
| 581 | struct netmsg nmsg; |
| 582 | int error; |
| 583 | |
| 584 | if (ifp->if_qpoll == NULL) |
| 585 | return EOPNOTSUPP; |
| 586 | |
| 587 | ifnet_serialize_all(ifp); |
| 588 | |
| 589 | if ((ifp->if_flags & IFF_NPOLLING) == 0) { |
| 590 | ifnet_deserialize_all(ifp); |
| 591 | return EINVAL; |
| 592 | } |
| 593 | ifp->if_flags &= ~IFF_NPOLLING; |
| 594 | |
| 595 | ifnet_deserialize_all(ifp); |
| 596 | |
| 597 | netmsg_init(&nmsg, &curthread->td_msgport, MSGF_MPSAFE, |
| 598 | ifpoll_deregister_handler); |
| 599 | nmsg.nm_lmsg.u.ms_resultp = ifp; |
| 600 | |
| 601 | error = ifnet_domsg(&nmsg.nm_lmsg, 0); |
| 602 | if (!error) { |
| 603 | ifnet_serialize_all(ifp); |
| 604 | ifp->if_qpoll(ifp, NULL); |
| 605 | ifnet_deserialize_all(ifp); |
| 606 | } |
| 607 | return error; |
| 608 | } |
| 609 | |
| 610 | static void |
| 611 | ifpoll_register_handler(struct netmsg *nmsg) |
| 612 | { |
| 613 | const struct ifpoll_info *info = nmsg->nm_lmsg.u.ms_resultp; |
| 614 | int cpuid = mycpuid, nextcpu; |
| 615 | int error; |
| 616 | |
| 617 | KKASSERT(cpuid < ifpoll_ncpus); |
| 618 | KKASSERT(&curthread->td_msgport == ifnet_portfn(cpuid)); |
| 619 | |
| 620 | if (cpuid == 0) { |
| 621 | error = stpoll_register(info->ifpi_ifp, &info->ifpi_status); |
| 622 | if (error) |
| 623 | goto failed; |
| 624 | } |
| 625 | |
| 626 | error = iopoll_register(info->ifpi_ifp, rxpoll_context[cpuid], |
| 627 | &info->ifpi_rx[cpuid]); |
| 628 | if (error) |
| 629 | goto failed; |
| 630 | |
| 631 | error = iopoll_register(info->ifpi_ifp, txpoll_context[cpuid], |
| 632 | &info->ifpi_tx[cpuid]); |
| 633 | if (error) |
| 634 | goto failed; |
| 635 | |
| 636 | nextcpu = cpuid + 1; |
| 637 | if (nextcpu < ifpoll_ncpus) |
| 638 | ifnet_forwardmsg(&nmsg->nm_lmsg, nextcpu); |
| 639 | else |
| 640 | lwkt_replymsg(&nmsg->nm_lmsg, 0); |
| 641 | return; |
| 642 | failed: |
| 643 | lwkt_replymsg(&nmsg->nm_lmsg, error); |
| 644 | } |
| 645 | |
| 646 | static void |
| 647 | ifpoll_deregister_handler(struct netmsg *nmsg) |
| 648 | { |
| 649 | struct ifnet *ifp = nmsg->nm_lmsg.u.ms_resultp; |
| 650 | int cpuid = mycpuid, nextcpu; |
| 651 | |
| 652 | KKASSERT(cpuid < ifpoll_ncpus); |
| 653 | KKASSERT(&curthread->td_msgport == ifnet_portfn(cpuid)); |
| 654 | |
| 655 | /* Ignore errors */ |
| 656 | if (cpuid == 0) |
| 657 | stpoll_deregister(ifp); |
| 658 | iopoll_deregister(ifp, rxpoll_context[cpuid]); |
| 659 | iopoll_deregister(ifp, txpoll_context[cpuid]); |
| 660 | |
| 661 | nextcpu = cpuid + 1; |
| 662 | if (nextcpu < ifpoll_ncpus) |
| 663 | ifnet_forwardmsg(&nmsg->nm_lmsg, nextcpu); |
| 664 | else |
| 665 | lwkt_replymsg(&nmsg->nm_lmsg, 0); |
| 666 | } |
| 667 | |
| 668 | static void |
| 669 | stpoll_init(void) |
| 670 | { |
| 671 | struct stpoll_ctx *st_ctx = &stpoll_context; |
| 672 | |
| 673 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 674 | st_ctx->pollhz = stpoll_hz; |
| 675 | #endif |
| 676 | |
| 677 | sysctl_ctx_init(&st_ctx->poll_sysctl_ctx); |
| 678 | st_ctx->poll_sysctl_tree = SYSCTL_ADD_NODE(&st_ctx->poll_sysctl_ctx, |
| 679 | SYSCTL_STATIC_CHILDREN(_net_ifpoll), |
| 680 | OID_AUTO, "status", CTLFLAG_RD, 0, ""); |
| 681 | |
| 682 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 683 | SYSCTL_ADD_PROC(&st_ctx->poll_sysctl_ctx, |
| 684 | SYSCTL_CHILDREN(st_ctx->poll_sysctl_tree), |
| 685 | OID_AUTO, "pollhz", CTLTYPE_INT | CTLFLAG_RW, |
| 686 | st_ctx, 0, sysctl_stpollhz, "I", |
| 687 | "Status polling frequency"); |
| 688 | #endif |
| 689 | |
| 690 | SYSCTL_ADD_UINT(&st_ctx->poll_sysctl_ctx, |
| 691 | SYSCTL_CHILDREN(st_ctx->poll_sysctl_tree), |
| 692 | OID_AUTO, "handlers", CTLFLAG_RD, |
| 693 | &st_ctx->poll_handlers, 0, |
| 694 | "Number of registered status poll handlers"); |
| 695 | |
| 696 | netmsg_init(&st_ctx->poll_netmsg, &netisr_adone_rport, MSGF_MPSAFE, |
| 697 | stpoll_handler); |
| 698 | |
| 699 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 700 | systimer_init_periodic_nq(&st_ctx->pollclock, |
| 701 | stpoll_systimer, st_ctx, 1); |
| 702 | #endif |
| 703 | } |
| 704 | |
| 705 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 706 | |
| 707 | static void |
| 708 | sysctl_stpollhz_handler(struct netmsg *msg) |
| 709 | { |
| 710 | struct stpoll_ctx *st_ctx = &stpoll_context; |
| 711 | |
| 712 | KKASSERT(&curthread->td_msgport == ifnet_portfn(0)); |
| 713 | |
| 714 | /* |
| 715 | * If there is no handler registered, don't adjust polling |
| 716 | * systimer frequency; polling systimer frequency will be |
| 717 | * adjusted once there is registered handler. |
| 718 | */ |
| 719 | st_ctx->pollhz = msg->nm_lmsg.u.ms_result; |
| 720 | if (st_ctx->poll_handlers) |
| 721 | systimer_adjust_periodic(&st_ctx->pollclock, st_ctx->pollhz); |
| 722 | |
| 723 | lwkt_replymsg(&msg->nm_lmsg, 0); |
| 724 | } |
| 725 | |
| 726 | static int |
| 727 | sysctl_stpollhz(SYSCTL_HANDLER_ARGS) |
| 728 | { |
| 729 | struct stpoll_ctx *st_ctx = arg1; |
| 730 | struct netmsg msg; |
| 731 | int error, phz; |
| 732 | |
| 733 | phz = st_ctx->pollhz; |
| 734 | error = sysctl_handle_int(oidp, &phz, 0, req); |
| 735 | if (error || req->newptr == NULL) |
| 736 | return error; |
| 737 | if (phz <= 0) |
| 738 | return EINVAL; |
| 739 | else if (phz > IFPOLL_FREQ_MAX) |
| 740 | phz = IFPOLL_FREQ_MAX; |
| 741 | |
| 742 | netmsg_init(&msg, &curthread->td_msgport, MSGF_MPSAFE, |
| 743 | sysctl_stpollhz_handler); |
| 744 | msg.nm_lmsg.u.ms_result = phz; |
| 745 | |
| 746 | return ifnet_domsg(&msg.nm_lmsg, 0); |
| 747 | } |
| 748 | |
| 749 | #endif /* IFPOLL_MULTI_SYSTIMER */ |
| 750 | |
| 751 | /* |
| 752 | * stpoll_handler is scheduled by sched_stpoll when appropriate, typically |
| 753 | * once per polling systimer tick. |
| 754 | */ |
| 755 | static void |
| 756 | stpoll_handler(struct netmsg *msg) |
| 757 | { |
| 758 | struct stpoll_ctx *st_ctx = &stpoll_context; |
| 759 | struct thread *td = curthread; |
| 760 | int i, poll_hz; |
| 761 | |
| 762 | KKASSERT(&td->td_msgport == ifnet_portfn(0)); |
| 763 | |
| 764 | crit_enter_quick(td); |
| 765 | |
| 766 | /* Reply ASAP */ |
| 767 | lwkt_replymsg(&msg->nm_lmsg, 0); |
| 768 | |
| 769 | if (st_ctx->poll_handlers == 0) { |
| 770 | crit_exit_quick(td); |
| 771 | return; |
| 772 | } |
| 773 | |
| 774 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 775 | poll_hz = st_ctx->pollhz; |
| 776 | #else |
| 777 | poll_hz = ifpoll_pollhz / (ifpoll_stfrac + 1); |
| 778 | #endif |
| 779 | |
| 780 | for (i = 0; i < st_ctx->poll_handlers; ++i) { |
| 781 | const struct stpoll_rec *rec = &st_ctx->pr[i]; |
| 782 | struct ifnet *ifp = rec->ifp; |
| 783 | |
| 784 | if (!lwkt_serialize_try(rec->serializer)) |
| 785 | continue; |
| 786 | |
| 787 | if ((ifp->if_flags & (IFF_RUNNING | IFF_NPOLLING)) == |
| 788 | (IFF_RUNNING | IFF_NPOLLING)) |
| 789 | rec->status_func(ifp, poll_hz); |
| 790 | |
| 791 | lwkt_serialize_exit(rec->serializer); |
| 792 | } |
| 793 | |
| 794 | crit_exit_quick(td); |
| 795 | } |
| 796 | |
| 797 | /* |
| 798 | * Hook from status poll systimer. Tries to schedule an status poll. |
| 799 | */ |
| 800 | static void |
| 801 | stpoll_clock(struct stpoll_ctx *st_ctx) |
| 802 | { |
| 803 | globaldata_t gd = mycpu; |
| 804 | |
| 805 | KKASSERT(gd->gd_cpuid == 0); |
| 806 | |
| 807 | if (st_ctx->poll_handlers == 0) |
| 808 | return; |
| 809 | |
| 810 | crit_enter_gd(gd); |
| 811 | sched_stpoll(st_ctx); |
| 812 | crit_exit_gd(gd); |
| 813 | } |
| 814 | |
| 815 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 816 | static void |
| 817 | stpoll_systimer(systimer_t info, struct intrframe *frame __unused) |
| 818 | { |
| 819 | stpoll_clock(info->data); |
| 820 | } |
| 821 | #endif |
| 822 | |
| 823 | static int |
| 824 | stpoll_register(struct ifnet *ifp, const struct ifpoll_status *st_rec) |
| 825 | { |
| 826 | struct stpoll_ctx *st_ctx = &stpoll_context; |
| 827 | int error; |
| 828 | |
| 829 | KKASSERT(&curthread->td_msgport == ifnet_portfn(0)); |
| 830 | |
| 831 | if (st_rec->status_func == NULL) |
| 832 | return 0; |
| 833 | |
| 834 | /* |
| 835 | * Check if there is room. |
| 836 | */ |
| 837 | if (st_ctx->poll_handlers >= IFPOLL_LIST_LEN) { |
| 838 | /* |
| 839 | * List full, cannot register more entries. |
| 840 | * This should never happen; if it does, it is probably a |
| 841 | * broken driver trying to register multiple times. Checking |
| 842 | * this at runtime is expensive, and won't solve the problem |
| 843 | * anyways, so just report a few times and then give up. |
| 844 | */ |
| 845 | static int verbose = 10; /* XXX */ |
| 846 | |
| 847 | if (verbose > 0) { |
| 848 | kprintf("status poll handlers list full, " |
| 849 | "maybe a broken driver ?\n"); |
| 850 | verbose--; |
| 851 | } |
| 852 | error = ENOENT; |
| 853 | } else { |
| 854 | struct stpoll_rec *rec = &st_ctx->pr[st_ctx->poll_handlers]; |
| 855 | |
| 856 | rec->ifp = ifp; |
| 857 | rec->serializer = st_rec->serializer; |
| 858 | rec->status_func = st_rec->status_func; |
| 859 | |
| 860 | st_ctx->poll_handlers++; |
| 861 | |
| 862 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 863 | if (st_ctx->poll_handlers == 1) { |
| 864 | systimer_adjust_periodic(&st_ctx->pollclock, |
| 865 | st_ctx->pollhz); |
| 866 | } |
| 867 | #else |
| 868 | ifpoll_handler_addevent(); |
| 869 | #endif |
| 870 | error = 0; |
| 871 | } |
| 872 | return error; |
| 873 | } |
| 874 | |
| 875 | static int |
| 876 | stpoll_deregister(struct ifnet *ifp) |
| 877 | { |
| 878 | struct stpoll_ctx *st_ctx = &stpoll_context; |
| 879 | int i, error; |
| 880 | |
| 881 | KKASSERT(&curthread->td_msgport == ifnet_portfn(0)); |
| 882 | |
| 883 | for (i = 0; i < st_ctx->poll_handlers; ++i) { |
| 884 | if (st_ctx->pr[i].ifp == ifp) /* Found it */ |
| 885 | break; |
| 886 | } |
| 887 | if (i == st_ctx->poll_handlers) { |
| 888 | kprintf("stpoll_deregister: ifp not found!!!\n"); |
| 889 | error = ENOENT; |
| 890 | } else { |
| 891 | st_ctx->poll_handlers--; |
| 892 | if (i < st_ctx->poll_handlers) { |
| 893 | /* Last entry replaces this one. */ |
| 894 | st_ctx->pr[i] = st_ctx->pr[st_ctx->poll_handlers]; |
| 895 | } |
| 896 | |
| 897 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 898 | if (st_ctx->poll_handlers == 0) |
| 899 | systimer_adjust_periodic(&st_ctx->pollclock, 1); |
| 900 | #else |
| 901 | ifpoll_handler_delevent(); |
| 902 | #endif |
| 903 | error = 0; |
| 904 | } |
| 905 | return error; |
| 906 | } |
| 907 | |
| 908 | #ifndef IFPOLL_MULTI_SYSTIMER |
| 909 | static __inline int |
| 910 | iopoll_hz(struct iopoll_ctx *io_ctx) |
| 911 | { |
| 912 | int poll_hz; |
| 913 | |
| 914 | poll_hz = ifpoll_pollhz; |
| 915 | if (io_ctx->poll_type == IFPOLL_TX) |
| 916 | poll_hz /= ifpoll_txfrac + 1; |
| 917 | return poll_hz; |
| 918 | } |
| 919 | #endif |
| 920 | |
| 921 | static __inline void |
| 922 | iopoll_reset_state(struct iopoll_ctx *io_ctx) |
| 923 | { |
| 924 | crit_enter(); |
| 925 | io_ctx->poll_burst = 5; |
| 926 | io_ctx->pending_polls = 0; |
| 927 | io_ctx->residual_burst = 0; |
| 928 | io_ctx->phase = 0; |
| 929 | io_ctx->kern_frac = 0; |
| 930 | bzero(&io_ctx->poll_start_t, sizeof(io_ctx->poll_start_t)); |
| 931 | bzero(&io_ctx->prev_t, sizeof(io_ctx->prev_t)); |
| 932 | crit_exit(); |
| 933 | } |
| 934 | |
| 935 | static void |
| 936 | iopoll_init(int cpuid) |
| 937 | { |
| 938 | KKASSERT(cpuid < IFPOLL_CTX_MAX); |
| 939 | |
| 940 | /* Create iopoll_comm context before TX/RX poll context */ |
| 941 | iopoll_common[cpuid] = iopoll_comm_create(cpuid); |
| 942 | |
| 943 | rxpoll_context[cpuid] = iopoll_ctx_create(cpuid, IFPOLL_RX); |
| 944 | txpoll_context[cpuid] = iopoll_ctx_create(cpuid, IFPOLL_TX); |
| 945 | } |
| 946 | |
| 947 | static struct iopoll_comm * |
| 948 | iopoll_comm_create(int cpuid) |
| 949 | { |
| 950 | struct iopoll_comm *comm; |
| 951 | char cpuid_str[16]; |
| 952 | |
| 953 | comm = kmalloc(sizeof(*comm), M_DEVBUF, M_WAITOK | M_ZERO); |
| 954 | |
| 955 | ksnprintf(cpuid_str, sizeof(cpuid_str), "%d", cpuid); |
| 956 | |
| 957 | sysctl_ctx_init(&comm->sysctl_ctx); |
| 958 | comm->sysctl_tree = SYSCTL_ADD_NODE(&comm->sysctl_ctx, |
| 959 | SYSCTL_STATIC_CHILDREN(_net_ifpoll), |
| 960 | OID_AUTO, cpuid_str, CTLFLAG_RD, 0, ""); |
| 961 | |
| 962 | return comm; |
| 963 | } |
| 964 | |
| 965 | static struct iopoll_ctx * |
| 966 | iopoll_ctx_create(int cpuid, int poll_type) |
| 967 | { |
| 968 | struct iopoll_comm *comm; |
| 969 | struct iopoll_ctx *io_ctx; |
| 970 | const char *poll_type_str; |
| 971 | |
| 972 | KKASSERT(poll_type == IFPOLL_RX || poll_type == IFPOLL_TX); |
| 973 | |
| 974 | /* |
| 975 | * Make sure that tunables are in sane state |
| 976 | */ |
| 977 | if (iopoll_burst_max < MIN_IOPOLL_BURST_MAX) |
| 978 | iopoll_burst_max = MIN_IOPOLL_BURST_MAX; |
| 979 | else if (iopoll_burst_max > MAX_IOPOLL_BURST_MAX) |
| 980 | iopoll_burst_max = MAX_IOPOLL_BURST_MAX; |
| 981 | |
| 982 | if (iopoll_each_burst > iopoll_burst_max) |
| 983 | iopoll_each_burst = iopoll_burst_max; |
| 984 | |
| 985 | /* |
| 986 | * Create the per-cpu polling context |
| 987 | */ |
| 988 | io_ctx = kmalloc(sizeof(*io_ctx), M_DEVBUF, M_WAITOK | M_ZERO); |
| 989 | |
| 990 | io_ctx->poll_each_burst = iopoll_each_burst; |
| 991 | io_ctx->poll_burst_max = iopoll_burst_max; |
| 992 | io_ctx->user_frac = 50; |
| 993 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 994 | io_ctx->pollhz = iopoll_hz; |
| 995 | #else |
| 996 | io_ctx->poll_type = poll_type; |
| 997 | #endif |
| 998 | io_ctx->poll_cpuid = cpuid; |
| 999 | iopoll_reset_state(io_ctx); |
| 1000 | |
| 1001 | netmsg_init(&io_ctx->poll_netmsg, &netisr_adone_rport, MSGF_MPSAFE, |
| 1002 | iopoll_handler); |
| 1003 | io_ctx->poll_netmsg.nm_lmsg.u.ms_resultp = io_ctx; |
| 1004 | |
| 1005 | netmsg_init(&io_ctx->poll_more_netmsg, &netisr_adone_rport, MSGF_MPSAFE, |
| 1006 | iopollmore_handler); |
| 1007 | io_ctx->poll_more_netmsg.nm_lmsg.u.ms_resultp = io_ctx; |
| 1008 | |
| 1009 | /* |
| 1010 | * Initialize per-cpu sysctl nodes |
| 1011 | */ |
| 1012 | if (poll_type == IFPOLL_RX) |
| 1013 | poll_type_str = "rx"; |
| 1014 | else |
| 1015 | poll_type_str = "tx"; |
| 1016 | |
| 1017 | comm = iopoll_common[cpuid]; |
| 1018 | sysctl_ctx_init(&io_ctx->poll_sysctl_ctx); |
| 1019 | io_ctx->poll_sysctl_tree = SYSCTL_ADD_NODE(&io_ctx->poll_sysctl_ctx, |
| 1020 | SYSCTL_CHILDREN(comm->sysctl_tree), |
| 1021 | OID_AUTO, poll_type_str, CTLFLAG_RD, 0, ""); |
| 1022 | iopoll_add_sysctl(&io_ctx->poll_sysctl_ctx, |
| 1023 | SYSCTL_CHILDREN(io_ctx->poll_sysctl_tree), io_ctx); |
| 1024 | |
| 1025 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 1026 | /* |
| 1027 | * Initialize systimer |
| 1028 | */ |
| 1029 | systimer_init_periodic_nq(&io_ctx->pollclock, |
| 1030 | iopoll_systimer, io_ctx, 1); |
| 1031 | #endif |
| 1032 | |
| 1033 | return io_ctx; |
| 1034 | } |
| 1035 | |
| 1036 | /* |
| 1037 | * Hook from iopoll systimer. Tries to schedule an iopoll, but keeps |
| 1038 | * track of lost ticks due to the previous handler taking too long. |
| 1039 | * Normally, this should not happen, because polling handler should |
| 1040 | * run for a short time. However, in some cases (e.g. when there are |
| 1041 | * changes in link status etc.) the drivers take a very long time |
| 1042 | * (even in the order of milliseconds) to reset and reconfigure the |
| 1043 | * device, causing apparent lost polls. |
| 1044 | * |
| 1045 | * The first part of the code is just for debugging purposes, and tries |
| 1046 | * to count how often hardclock ticks are shorter than they should, |
| 1047 | * meaning either stray interrupts or delayed events. |
| 1048 | * |
| 1049 | * WARNING! called from fastint or IPI, the MP lock might not be held. |
| 1050 | */ |
| 1051 | static void |
| 1052 | iopoll_clock(struct iopoll_ctx *io_ctx) |
| 1053 | { |
| 1054 | globaldata_t gd = mycpu; |
| 1055 | union ifpoll_time t; |
| 1056 | int delta, poll_hz; |
| 1057 | |
| 1058 | KKASSERT(gd->gd_cpuid == io_ctx->poll_cpuid); |
| 1059 | |
| 1060 | if (io_ctx->poll_handlers == 0) |
| 1061 | return; |
| 1062 | |
| 1063 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 1064 | poll_hz = io_ctx->pollhz; |
| 1065 | #else |
| 1066 | poll_hz = iopoll_hz(io_ctx); |
| 1067 | #endif |
| 1068 | |
| 1069 | ifpoll_time_get(&t); |
| 1070 | delta = ifpoll_time_diff(&io_ctx->prev_t, &t); |
| 1071 | if (delta * poll_hz < 500000) |
| 1072 | io_ctx->short_ticks++; |
| 1073 | else |
| 1074 | io_ctx->prev_t = t; |
| 1075 | |
| 1076 | if (io_ctx->pending_polls > 100) { |
| 1077 | /* |
| 1078 | * Too much, assume it has stalled (not always true |
| 1079 | * see comment above). |
| 1080 | */ |
| 1081 | io_ctx->stalled++; |
| 1082 | io_ctx->pending_polls = 0; |
| 1083 | io_ctx->phase = 0; |
| 1084 | } |
| 1085 | |
| 1086 | if (io_ctx->phase <= 2) { |
| 1087 | if (io_ctx->phase != 0) |
| 1088 | io_ctx->suspect++; |
| 1089 | io_ctx->phase = 1; |
| 1090 | crit_enter_gd(gd); |
| 1091 | sched_iopoll(io_ctx); |
| 1092 | crit_exit_gd(gd); |
| 1093 | io_ctx->phase = 2; |
| 1094 | } |
| 1095 | if (io_ctx->pending_polls++ > 0) |
| 1096 | io_ctx->lost_polls++; |
| 1097 | } |
| 1098 | |
| 1099 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 1100 | static void |
| 1101 | iopoll_systimer(systimer_t info, struct intrframe *frame __unused) |
| 1102 | { |
| 1103 | iopoll_clock(info->data); |
| 1104 | } |
| 1105 | #endif |
| 1106 | |
| 1107 | /* |
| 1108 | * iopoll_handler is scheduled by sched_iopoll when appropriate, typically |
| 1109 | * once per polling systimer tick. |
| 1110 | * |
| 1111 | * Note that the message is replied immediately in order to allow a new |
| 1112 | * ISR to be scheduled in the handler. |
| 1113 | */ |
| 1114 | static void |
| 1115 | iopoll_handler(struct netmsg *msg) |
| 1116 | { |
| 1117 | struct iopoll_ctx *io_ctx; |
| 1118 | struct thread *td = curthread; |
| 1119 | int i, cycles; |
| 1120 | |
| 1121 | io_ctx = msg->nm_lmsg.u.ms_resultp; |
| 1122 | KKASSERT(&td->td_msgport == ifnet_portfn(io_ctx->poll_cpuid)); |
| 1123 | |
| 1124 | crit_enter_quick(td); |
| 1125 | |
| 1126 | /* Reply ASAP */ |
| 1127 | lwkt_replymsg(&msg->nm_lmsg, 0); |
| 1128 | |
| 1129 | if (io_ctx->poll_handlers == 0) { |
| 1130 | crit_exit_quick(td); |
| 1131 | return; |
| 1132 | } |
| 1133 | |
| 1134 | io_ctx->phase = 3; |
| 1135 | if (io_ctx->residual_burst == 0) { |
| 1136 | /* First call in this tick */ |
| 1137 | ifpoll_time_get(&io_ctx->poll_start_t); |
| 1138 | io_ctx->residual_burst = io_ctx->poll_burst; |
| 1139 | } |
| 1140 | cycles = (io_ctx->residual_burst < io_ctx->poll_each_burst) ? |
| 1141 | io_ctx->residual_burst : io_ctx->poll_each_burst; |
| 1142 | io_ctx->residual_burst -= cycles; |
| 1143 | |
| 1144 | for (i = 0; i < io_ctx->poll_handlers; i++) { |
| 1145 | const struct iopoll_rec *rec = &io_ctx->pr[i]; |
| 1146 | struct ifnet *ifp = rec->ifp; |
| 1147 | |
| 1148 | if (!lwkt_serialize_try(rec->serializer)) |
| 1149 | continue; |
| 1150 | |
| 1151 | if ((ifp->if_flags & (IFF_RUNNING | IFF_NPOLLING)) == |
| 1152 | (IFF_RUNNING | IFF_NPOLLING)) |
| 1153 | rec->poll_func(ifp, rec->arg, cycles); |
| 1154 | |
| 1155 | lwkt_serialize_exit(rec->serializer); |
| 1156 | } |
| 1157 | |
| 1158 | /* |
| 1159 | * Do a quick exit/enter to catch any higher-priority |
| 1160 | * interrupt sources. |
| 1161 | */ |
| 1162 | crit_exit_quick(td); |
| 1163 | crit_enter_quick(td); |
| 1164 | |
| 1165 | sched_iopollmore(io_ctx); |
| 1166 | io_ctx->phase = 4; |
| 1167 | |
| 1168 | crit_exit_quick(td); |
| 1169 | } |
| 1170 | |
| 1171 | /* |
| 1172 | * iopollmore_handler is called after other netisr's, possibly scheduling |
| 1173 | * another iopoll_handler call, or adapting the burst size for the next cycle. |
| 1174 | * |
| 1175 | * It is very bad to fetch large bursts of packets from a single card at once, |
| 1176 | * because the burst could take a long time to be completely processed leading |
| 1177 | * to unfairness. To reduce the problem, and also to account better for time |
| 1178 | * spent in network-related processing, we split the burst in smaller chunks |
| 1179 | * of fixed size, giving control to the other netisr's between chunks. This |
| 1180 | * helps in improving the fairness, reducing livelock and accounting for the |
| 1181 | * work performed in low level handling. |
| 1182 | */ |
| 1183 | static void |
| 1184 | iopollmore_handler(struct netmsg *msg) |
| 1185 | { |
| 1186 | struct thread *td = curthread; |
| 1187 | struct iopoll_ctx *io_ctx; |
| 1188 | union ifpoll_time t; |
| 1189 | int kern_load, poll_hz; |
| 1190 | uint32_t pending_polls; |
| 1191 | |
| 1192 | io_ctx = msg->nm_lmsg.u.ms_resultp; |
| 1193 | KKASSERT(&td->td_msgport == ifnet_portfn(io_ctx->poll_cpuid)); |
| 1194 | |
| 1195 | crit_enter_quick(td); |
| 1196 | |
| 1197 | /* Replay ASAP */ |
| 1198 | lwkt_replymsg(&msg->nm_lmsg, 0); |
| 1199 | |
| 1200 | if (io_ctx->poll_handlers == 0) { |
| 1201 | crit_exit_quick(td); |
| 1202 | return; |
| 1203 | } |
| 1204 | |
| 1205 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 1206 | poll_hz = io_ctx->pollhz; |
| 1207 | #else |
| 1208 | poll_hz = iopoll_hz(io_ctx); |
| 1209 | #endif |
| 1210 | |
| 1211 | io_ctx->phase = 5; |
| 1212 | if (io_ctx->residual_burst > 0) { |
| 1213 | sched_iopoll(io_ctx); |
| 1214 | crit_exit_quick(td); |
| 1215 | /* Will run immediately on return, followed by netisrs */ |
| 1216 | return; |
| 1217 | } |
| 1218 | |
| 1219 | /* Here we can account time spent in iopoll's in this tick */ |
| 1220 | ifpoll_time_get(&t); |
| 1221 | kern_load = ifpoll_time_diff(&io_ctx->poll_start_t, &t); |
| 1222 | kern_load = (kern_load * poll_hz) / 10000; /* 0..100 */ |
| 1223 | io_ctx->kern_frac = kern_load; |
| 1224 | |
| 1225 | if (kern_load > (100 - io_ctx->user_frac)) { |
| 1226 | /* Try decrease ticks */ |
| 1227 | if (io_ctx->poll_burst > 1) |
| 1228 | io_ctx->poll_burst--; |
| 1229 | } else { |
| 1230 | if (io_ctx->poll_burst < io_ctx->poll_burst_max) |
| 1231 | io_ctx->poll_burst++; |
| 1232 | } |
| 1233 | |
| 1234 | io_ctx->pending_polls--; |
| 1235 | pending_polls = io_ctx->pending_polls; |
| 1236 | |
| 1237 | if (pending_polls == 0) { |
| 1238 | /* We are done */ |
| 1239 | io_ctx->phase = 0; |
| 1240 | } else { |
| 1241 | /* |
| 1242 | * Last cycle was long and caused us to miss one or more |
| 1243 | * hardclock ticks. Restart processing again, but slightly |
| 1244 | * reduce the burst size to prevent that this happens again. |
| 1245 | */ |
| 1246 | io_ctx->poll_burst -= (io_ctx->poll_burst / 8); |
| 1247 | if (io_ctx->poll_burst < 1) |
| 1248 | io_ctx->poll_burst = 1; |
| 1249 | sched_iopoll(io_ctx); |
| 1250 | io_ctx->phase = 6; |
| 1251 | } |
| 1252 | |
| 1253 | crit_exit_quick(td); |
| 1254 | } |
| 1255 | |
| 1256 | static void |
| 1257 | iopoll_add_sysctl(struct sysctl_ctx_list *ctx, struct sysctl_oid_list *parent, |
| 1258 | struct iopoll_ctx *io_ctx) |
| 1259 | { |
| 1260 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 1261 | SYSCTL_ADD_PROC(ctx, parent, OID_AUTO, "pollhz", |
| 1262 | CTLTYPE_INT | CTLFLAG_RW, io_ctx, 0, sysctl_iopollhz, |
| 1263 | "I", "Device polling frequency"); |
| 1264 | #endif |
| 1265 | |
| 1266 | SYSCTL_ADD_PROC(ctx, parent, OID_AUTO, "burst_max", |
| 1267 | CTLTYPE_UINT | CTLFLAG_RW, io_ctx, 0, sysctl_burstmax, |
| 1268 | "IU", "Max Polling burst size"); |
| 1269 | |
| 1270 | SYSCTL_ADD_PROC(ctx, parent, OID_AUTO, "each_burst", |
| 1271 | CTLTYPE_UINT | CTLFLAG_RW, io_ctx, 0, sysctl_eachburst, |
| 1272 | "IU", "Max size of each burst"); |
| 1273 | |
| 1274 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "phase", CTLFLAG_RD, |
| 1275 | &io_ctx->phase, 0, "Polling phase"); |
| 1276 | |
| 1277 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "suspect", CTLFLAG_RW, |
| 1278 | &io_ctx->suspect, 0, "suspect event"); |
| 1279 | |
| 1280 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "stalled", CTLFLAG_RW, |
| 1281 | &io_ctx->stalled, 0, "potential stalls"); |
| 1282 | |
| 1283 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "burst", CTLFLAG_RD, |
| 1284 | &io_ctx->poll_burst, 0, "Current polling burst size"); |
| 1285 | |
| 1286 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "user_frac", CTLFLAG_RW, |
| 1287 | &io_ctx->user_frac, 0, |
| 1288 | "Desired user fraction of cpu time"); |
| 1289 | |
| 1290 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "kern_frac", CTLFLAG_RD, |
| 1291 | &io_ctx->kern_frac, 0, |
| 1292 | "Kernel fraction of cpu time"); |
| 1293 | |
| 1294 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "short_ticks", CTLFLAG_RW, |
| 1295 | &io_ctx->short_ticks, 0, |
| 1296 | "Hardclock ticks shorter than they should be"); |
| 1297 | |
| 1298 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "lost_polls", CTLFLAG_RW, |
| 1299 | &io_ctx->lost_polls, 0, |
| 1300 | "How many times we would have lost a poll tick"); |
| 1301 | |
| 1302 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "pending_polls", CTLFLAG_RD, |
| 1303 | &io_ctx->pending_polls, 0, "Do we need to poll again"); |
| 1304 | |
| 1305 | SYSCTL_ADD_INT(ctx, parent, OID_AUTO, "residual_burst", CTLFLAG_RD, |
| 1306 | &io_ctx->residual_burst, 0, |
| 1307 | "# of residual cycles in burst"); |
| 1308 | |
| 1309 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "handlers", CTLFLAG_RD, |
| 1310 | &io_ctx->poll_handlers, 0, |
| 1311 | "Number of registered poll handlers"); |
| 1312 | } |
| 1313 | |
| 1314 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 1315 | |
| 1316 | static int |
| 1317 | sysctl_iopollhz(SYSCTL_HANDLER_ARGS) |
| 1318 | { |
| 1319 | struct iopoll_ctx *io_ctx = arg1; |
| 1320 | struct iopoll_sysctl_netmsg msg; |
| 1321 | struct netmsg *nmsg; |
| 1322 | int error, phz; |
| 1323 | |
| 1324 | phz = io_ctx->pollhz; |
| 1325 | error = sysctl_handle_int(oidp, &phz, 0, req); |
| 1326 | if (error || req->newptr == NULL) |
| 1327 | return error; |
| 1328 | if (phz <= 0) |
| 1329 | return EINVAL; |
| 1330 | else if (phz > IFPOLL_FREQ_MAX) |
| 1331 | phz = IFPOLL_FREQ_MAX; |
| 1332 | |
| 1333 | nmsg = &msg.nmsg; |
| 1334 | netmsg_init(nmsg, &curthread->td_msgport, MSGF_MPSAFE, |
| 1335 | sysctl_iopollhz_handler); |
| 1336 | nmsg->nm_lmsg.u.ms_result = phz; |
| 1337 | msg.ctx = io_ctx; |
| 1338 | |
| 1339 | return ifnet_domsg(&nmsg->nm_lmsg, io_ctx->poll_cpuid); |
| 1340 | } |
| 1341 | |
| 1342 | static void |
| 1343 | sysctl_iopollhz_handler(struct netmsg *nmsg) |
| 1344 | { |
| 1345 | struct iopoll_sysctl_netmsg *msg = (struct iopoll_sysctl_netmsg *)nmsg; |
| 1346 | struct iopoll_ctx *io_ctx; |
| 1347 | |
| 1348 | io_ctx = msg->ctx; |
| 1349 | KKASSERT(&curthread->td_msgport == ifnet_portfn(io_ctx->poll_cpuid)); |
| 1350 | |
| 1351 | /* |
| 1352 | * If polling is disabled or there is no polling handler |
| 1353 | * registered, don't adjust polling systimer frequency. |
| 1354 | * Polling systimer frequency will be adjusted once there |
| 1355 | * are registered handlers. |
| 1356 | */ |
| 1357 | io_ctx->pollhz = nmsg->nm_lmsg.u.ms_result; |
| 1358 | if (io_ctx->poll_handlers) |
| 1359 | systimer_adjust_periodic(&io_ctx->pollclock, io_ctx->pollhz); |
| 1360 | |
| 1361 | lwkt_replymsg(&nmsg->nm_lmsg, 0); |
| 1362 | } |
| 1363 | |
| 1364 | #endif /* IFPOLL_MULTI_SYSTIMER */ |
| 1365 | |
| 1366 | static void |
| 1367 | sysctl_burstmax_handler(struct netmsg *nmsg) |
| 1368 | { |
| 1369 | struct iopoll_sysctl_netmsg *msg = (struct iopoll_sysctl_netmsg *)nmsg; |
| 1370 | struct iopoll_ctx *io_ctx; |
| 1371 | |
| 1372 | io_ctx = msg->ctx; |
| 1373 | KKASSERT(&curthread->td_msgport == ifnet_portfn(io_ctx->poll_cpuid)); |
| 1374 | |
| 1375 | io_ctx->poll_burst_max = nmsg->nm_lmsg.u.ms_result; |
| 1376 | if (io_ctx->poll_each_burst > io_ctx->poll_burst_max) |
| 1377 | io_ctx->poll_each_burst = io_ctx->poll_burst_max; |
| 1378 | if (io_ctx->poll_burst > io_ctx->poll_burst_max) |
| 1379 | io_ctx->poll_burst = io_ctx->poll_burst_max; |
| 1380 | if (io_ctx->residual_burst > io_ctx->poll_burst_max) |
| 1381 | io_ctx->residual_burst = io_ctx->poll_burst_max; |
| 1382 | |
| 1383 | lwkt_replymsg(&nmsg->nm_lmsg, 0); |
| 1384 | } |
| 1385 | |
| 1386 | static int |
| 1387 | sysctl_burstmax(SYSCTL_HANDLER_ARGS) |
| 1388 | { |
| 1389 | struct iopoll_ctx *io_ctx = arg1; |
| 1390 | struct iopoll_sysctl_netmsg msg; |
| 1391 | struct netmsg *nmsg; |
| 1392 | uint32_t burst_max; |
| 1393 | int error; |
| 1394 | |
| 1395 | burst_max = io_ctx->poll_burst_max; |
| 1396 | error = sysctl_handle_int(oidp, &burst_max, 0, req); |
| 1397 | if (error || req->newptr == NULL) |
| 1398 | return error; |
| 1399 | if (burst_max < MIN_IOPOLL_BURST_MAX) |
| 1400 | burst_max = MIN_IOPOLL_BURST_MAX; |
| 1401 | else if (burst_max > MAX_IOPOLL_BURST_MAX) |
| 1402 | burst_max = MAX_IOPOLL_BURST_MAX; |
| 1403 | |
| 1404 | nmsg = &msg.nmsg; |
| 1405 | netmsg_init(nmsg, &curthread->td_msgport, MSGF_MPSAFE, |
| 1406 | sysctl_burstmax_handler); |
| 1407 | nmsg->nm_lmsg.u.ms_result = burst_max; |
| 1408 | msg.ctx = io_ctx; |
| 1409 | |
| 1410 | return ifnet_domsg(&nmsg->nm_lmsg, io_ctx->poll_cpuid); |
| 1411 | } |
| 1412 | |
| 1413 | static void |
| 1414 | sysctl_eachburst_handler(struct netmsg *nmsg) |
| 1415 | { |
| 1416 | struct iopoll_sysctl_netmsg *msg = (struct iopoll_sysctl_netmsg *)nmsg; |
| 1417 | struct iopoll_ctx *io_ctx; |
| 1418 | uint32_t each_burst; |
| 1419 | |
| 1420 | io_ctx = msg->ctx; |
| 1421 | KKASSERT(&curthread->td_msgport == ifnet_portfn(io_ctx->poll_cpuid)); |
| 1422 | |
| 1423 | each_burst = nmsg->nm_lmsg.u.ms_result; |
| 1424 | if (each_burst > io_ctx->poll_burst_max) |
| 1425 | each_burst = io_ctx->poll_burst_max; |
| 1426 | else if (each_burst < 1) |
| 1427 | each_burst = 1; |
| 1428 | io_ctx->poll_each_burst = each_burst; |
| 1429 | |
| 1430 | lwkt_replymsg(&nmsg->nm_lmsg, 0); |
| 1431 | } |
| 1432 | |
| 1433 | static int |
| 1434 | sysctl_eachburst(SYSCTL_HANDLER_ARGS) |
| 1435 | { |
| 1436 | struct iopoll_ctx *io_ctx = arg1; |
| 1437 | struct iopoll_sysctl_netmsg msg; |
| 1438 | struct netmsg *nmsg; |
| 1439 | uint32_t each_burst; |
| 1440 | int error; |
| 1441 | |
| 1442 | each_burst = io_ctx->poll_each_burst; |
| 1443 | error = sysctl_handle_int(oidp, &each_burst, 0, req); |
| 1444 | if (error || req->newptr == NULL) |
| 1445 | return error; |
| 1446 | |
| 1447 | nmsg = &msg.nmsg; |
| 1448 | netmsg_init(nmsg, &curthread->td_msgport, MSGF_MPSAFE, |
| 1449 | sysctl_eachburst_handler); |
| 1450 | nmsg->nm_lmsg.u.ms_result = each_burst; |
| 1451 | msg.ctx = io_ctx; |
| 1452 | |
| 1453 | return ifnet_domsg(&nmsg->nm_lmsg, io_ctx->poll_cpuid); |
| 1454 | } |
| 1455 | |
| 1456 | static int |
| 1457 | iopoll_register(struct ifnet *ifp, struct iopoll_ctx *io_ctx, |
| 1458 | const struct ifpoll_io *io_rec) |
| 1459 | { |
| 1460 | int error; |
| 1461 | |
| 1462 | KKASSERT(&curthread->td_msgport == ifnet_portfn(io_ctx->poll_cpuid)); |
| 1463 | |
| 1464 | if (io_rec->poll_func == NULL) |
| 1465 | return 0; |
| 1466 | |
| 1467 | /* |
| 1468 | * Check if there is room. |
| 1469 | */ |
| 1470 | if (io_ctx->poll_handlers >= IFPOLL_LIST_LEN) { |
| 1471 | /* |
| 1472 | * List full, cannot register more entries. |
| 1473 | * This should never happen; if it does, it is probably a |
| 1474 | * broken driver trying to register multiple times. Checking |
| 1475 | * this at runtime is expensive, and won't solve the problem |
| 1476 | * anyways, so just report a few times and then give up. |
| 1477 | */ |
| 1478 | static int verbose = 10; /* XXX */ |
| 1479 | if (verbose > 0) { |
| 1480 | kprintf("io poll handlers list full, " |
| 1481 | "maybe a broken driver ?\n"); |
| 1482 | verbose--; |
| 1483 | } |
| 1484 | error = ENOENT; |
| 1485 | } else { |
| 1486 | struct iopoll_rec *rec = &io_ctx->pr[io_ctx->poll_handlers]; |
| 1487 | |
| 1488 | rec->ifp = ifp; |
| 1489 | rec->serializer = io_rec->serializer; |
| 1490 | rec->arg = io_rec->arg; |
| 1491 | rec->poll_func = io_rec->poll_func; |
| 1492 | |
| 1493 | io_ctx->poll_handlers++; |
| 1494 | if (io_ctx->poll_handlers == 1) { |
| 1495 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 1496 | systimer_adjust_periodic(&io_ctx->pollclock, |
| 1497 | io_ctx->pollhz); |
| 1498 | #else |
| 1499 | u_int *mask; |
| 1500 | |
| 1501 | if (io_ctx->poll_type == IFPOLL_RX) |
| 1502 | mask = &ifpoll0.rx_cpumask; |
| 1503 | else |
| 1504 | mask = &ifpoll0.tx_cpumask; |
| 1505 | KKASSERT((*mask & mycpu->gd_cpumask) == 0); |
| 1506 | atomic_set_int(mask, mycpu->gd_cpumask); |
| 1507 | #endif |
| 1508 | } |
| 1509 | #ifndef IFPOLL_MULTI_SYSTIMER |
| 1510 | ifpoll_handler_addevent(); |
| 1511 | #endif |
| 1512 | error = 0; |
| 1513 | } |
| 1514 | return error; |
| 1515 | } |
| 1516 | |
| 1517 | static int |
| 1518 | iopoll_deregister(struct ifnet *ifp, struct iopoll_ctx *io_ctx) |
| 1519 | { |
| 1520 | int i, error; |
| 1521 | |
| 1522 | KKASSERT(&curthread->td_msgport == ifnet_portfn(io_ctx->poll_cpuid)); |
| 1523 | |
| 1524 | for (i = 0; i < io_ctx->poll_handlers; ++i) { |
| 1525 | if (io_ctx->pr[i].ifp == ifp) /* Found it */ |
| 1526 | break; |
| 1527 | } |
| 1528 | if (i == io_ctx->poll_handlers) { |
| 1529 | error = ENOENT; |
| 1530 | } else { |
| 1531 | io_ctx->poll_handlers--; |
| 1532 | if (i < io_ctx->poll_handlers) { |
| 1533 | /* Last entry replaces this one. */ |
| 1534 | io_ctx->pr[i] = io_ctx->pr[io_ctx->poll_handlers]; |
| 1535 | } |
| 1536 | |
| 1537 | if (io_ctx->poll_handlers == 0) { |
| 1538 | #ifdef IFPOLL_MULTI_SYSTIMER |
| 1539 | systimer_adjust_periodic(&io_ctx->pollclock, 1); |
| 1540 | #else |
| 1541 | u_int *mask; |
| 1542 | |
| 1543 | if (io_ctx->poll_type == IFPOLL_RX) |
| 1544 | mask = &ifpoll0.rx_cpumask; |
| 1545 | else |
| 1546 | mask = &ifpoll0.tx_cpumask; |
| 1547 | KKASSERT(*mask & mycpu->gd_cpumask); |
| 1548 | atomic_clear_int(mask, mycpu->gd_cpumask); |
| 1549 | #endif |
| 1550 | iopoll_reset_state(io_ctx); |
| 1551 | } |
| 1552 | #ifndef IFPOLL_MULTI_SYSTIMER |
| 1553 | ifpoll_handler_delevent(); |
| 1554 | #endif |
| 1555 | error = 0; |
| 1556 | } |
| 1557 | return error; |
| 1558 | } |