1 /* 2 * Copyright (c) 2003, 2004 Matthew Dillon. All rights reserved. 3 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved. 4 * Copyright (c) 2003 Jonathan Lemon. All rights reserved. 5 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved. 6 * 7 * This code is derived from software contributed to The DragonFly Project 8 * by Jonathan Lemon, Jeffrey M. Hsu, and Matthew Dillon. 9 * 10 * Jonathan Lemon gave Jeffrey Hsu permission to combine his copyright 11 * into this one around July 8 2004. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of The DragonFly Project nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific, prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 28 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 29 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 30 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 31 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 32 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 33 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 34 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 35 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/malloc.h> 43 #include <sys/msgport.h> 44 #include <sys/proc.h> 45 #include <sys/interrupt.h> 46 #include <sys/socket.h> 47 #include <sys/sysctl.h> 48 #include <sys/socketvar.h> 49 #include <net/if.h> 50 #include <net/if_var.h> 51 #include <net/netisr2.h> 52 #include <machine/cpufunc.h> 53 #include <machine/smp.h> 54 55 #include <sys/thread2.h> 56 #include <sys/msgport2.h> 57 #include <net/netmsg2.h> 58 #include <sys/mplock2.h> 59 60 static void netmsg_service_loop(void *arg); 61 static void netisr_hashfn0(struct mbuf **mp, int hoff); 62 static void netisr_nohashck(struct mbuf *, const struct pktinfo *); 63 64 struct netmsg_port_registration { 65 TAILQ_ENTRY(netmsg_port_registration) npr_entry; 66 lwkt_port_t npr_port; 67 }; 68 69 struct netmsg_rollup { 70 TAILQ_ENTRY(netmsg_rollup) ru_entry; 71 netisr_ru_t ru_func; 72 int ru_prio; 73 }; 74 75 struct netmsg_barrier { 76 struct netmsg_base base; 77 volatile cpumask_t *br_cpumask; 78 volatile uint32_t br_done; 79 }; 80 81 #define NETISR_BR_NOTDONE 0x1 82 #define NETISR_BR_WAITDONE 0x80000000 83 84 struct netisr_barrier { 85 struct netmsg_barrier *br_msgs[MAXCPU]; 86 int br_isset; 87 }; 88 89 static struct netisr netisrs[NETISR_MAX]; 90 static TAILQ_HEAD(,netmsg_port_registration) netreglist; 91 static TAILQ_HEAD(,netmsg_rollup) netrulist; 92 93 /* Per-CPU thread to handle any protocol. */ 94 struct thread netisr_cpu[MAXCPU]; 95 lwkt_port netisr_afree_rport; 96 lwkt_port netisr_afree_free_so_rport; 97 lwkt_port netisr_adone_rport; 98 lwkt_port netisr_apanic_rport; 99 lwkt_port netisr_sync_port; 100 101 static int (*netmsg_fwd_port_fn)(lwkt_port_t, lwkt_msg_t); 102 103 SYSCTL_NODE(_net, OID_AUTO, netisr, CTLFLAG_RW, 0, "netisr"); 104 105 /* 106 * netisr_afree_rport replymsg function, only used to handle async 107 * messages which the sender has abandoned to their fate. 108 */ 109 static void 110 netisr_autofree_reply(lwkt_port_t port, lwkt_msg_t msg) 111 { 112 kfree(msg, M_LWKTMSG); 113 } 114 115 static void 116 netisr_autofree_free_so_reply(lwkt_port_t port, lwkt_msg_t msg) 117 { 118 sofree(((netmsg_t)msg)->base.nm_so); 119 kfree(msg, M_LWKTMSG); 120 } 121 122 /* 123 * We need a custom putport function to handle the case where the 124 * message target is the current thread's message port. This case 125 * can occur when the TCP or UDP stack does a direct callback to NFS and NFS 126 * then turns around and executes a network operation synchronously. 127 * 128 * To prevent deadlocking, we must execute these self-referential messages 129 * synchronously, effectively turning the message into a glorified direct 130 * procedure call back into the protocol stack. The operation must be 131 * complete on return or we will deadlock, so panic if it isn't. 132 * 133 * However, the target function is under no obligation to immediately 134 * reply the message. It may forward it elsewhere. 135 */ 136 static int 137 netmsg_put_port(lwkt_port_t port, lwkt_msg_t lmsg) 138 { 139 netmsg_base_t nmsg = (void *)lmsg; 140 141 if ((lmsg->ms_flags & MSGF_SYNC) && port == &curthread->td_msgport) { 142 nmsg->nm_dispatch((netmsg_t)nmsg); 143 return(EASYNC); 144 } else { 145 return(netmsg_fwd_port_fn(port, lmsg)); 146 } 147 } 148 149 /* 150 * UNIX DOMAIN sockets still have to run their uipc functions synchronously, 151 * because they depend on the user proc context for a number of things 152 * (like creds) which we have not yet incorporated into the message structure. 153 * 154 * However, we maintain or message/port abstraction. Having a special 155 * synchronous port which runs the commands synchronously gives us the 156 * ability to serialize operations in one place later on when we start 157 * removing the BGL. 158 */ 159 static int 160 netmsg_sync_putport(lwkt_port_t port, lwkt_msg_t lmsg) 161 { 162 netmsg_base_t nmsg = (void *)lmsg; 163 164 KKASSERT((lmsg->ms_flags & MSGF_DONE) == 0); 165 166 lmsg->ms_target_port = port; /* required for abort */ 167 nmsg->nm_dispatch((netmsg_t)nmsg); 168 return(EASYNC); 169 } 170 171 static void 172 netisr_init(void) 173 { 174 int i; 175 176 TAILQ_INIT(&netreglist); 177 TAILQ_INIT(&netrulist); 178 179 /* 180 * Create default per-cpu threads for generic protocol handling. 181 */ 182 for (i = 0; i < ncpus; ++i) { 183 lwkt_create(netmsg_service_loop, NULL, NULL, 184 &netisr_cpu[i], 185 TDF_NOSTART|TDF_FORCE_SPINPORT|TDF_FIXEDCPU, 186 i, "netisr_cpu %d", i); 187 netmsg_service_port_init(&netisr_cpu[i].td_msgport); 188 lwkt_schedule(&netisr_cpu[i]); 189 } 190 191 /* 192 * The netisr_afree_rport is a special reply port which automatically 193 * frees the replied message. The netisr_adone_rport simply marks 194 * the message as being done. The netisr_apanic_rport panics if 195 * the message is replied to. 196 */ 197 lwkt_initport_replyonly(&netisr_afree_rport, netisr_autofree_reply); 198 lwkt_initport_replyonly(&netisr_afree_free_so_rport, 199 netisr_autofree_free_so_reply); 200 lwkt_initport_replyonly_null(&netisr_adone_rport); 201 lwkt_initport_panic(&netisr_apanic_rport); 202 203 /* 204 * The netisr_syncport is a special port which executes the message 205 * synchronously and waits for it if EASYNC is returned. 206 */ 207 lwkt_initport_putonly(&netisr_sync_port, netmsg_sync_putport); 208 } 209 210 SYSINIT(netisr, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, netisr_init, NULL); 211 212 /* 213 * Finish initializing the message port for a netmsg service. This also 214 * registers the port for synchronous cleanup operations such as when an 215 * ifnet is being destroyed. There is no deregistration API yet. 216 */ 217 void 218 netmsg_service_port_init(lwkt_port_t port) 219 { 220 struct netmsg_port_registration *reg; 221 222 /* 223 * Override the putport function. Our custom function checks for 224 * self-references and executes such commands synchronously. 225 */ 226 if (netmsg_fwd_port_fn == NULL) 227 netmsg_fwd_port_fn = port->mp_putport; 228 KKASSERT(netmsg_fwd_port_fn == port->mp_putport); 229 port->mp_putport = netmsg_put_port; 230 231 /* 232 * Keep track of ports using the netmsg API so we can synchronize 233 * certain operations (such as freeing an ifnet structure) across all 234 * consumers. 235 */ 236 reg = kmalloc(sizeof(*reg), M_TEMP, M_WAITOK|M_ZERO); 237 reg->npr_port = port; 238 TAILQ_INSERT_TAIL(&netreglist, reg, npr_entry); 239 } 240 241 /* 242 * This function synchronizes the caller with all netmsg services. For 243 * example, if an interface is being removed we must make sure that all 244 * packets related to that interface complete processing before the structure 245 * can actually be freed. This sort of synchronization is an alternative to 246 * ref-counting the netif, removing the ref counting overhead in favor of 247 * placing additional overhead in the netif freeing sequence (where it is 248 * inconsequential). 249 */ 250 void 251 netmsg_service_sync(void) 252 { 253 struct netmsg_port_registration *reg; 254 struct netmsg_base smsg; 255 256 netmsg_init(&smsg, NULL, &curthread->td_msgport, 0, netmsg_sync_handler); 257 258 TAILQ_FOREACH(reg, &netreglist, npr_entry) { 259 lwkt_domsg(reg->npr_port, &smsg.lmsg, 0); 260 } 261 } 262 263 /* 264 * The netmsg function simply replies the message. API semantics require 265 * EASYNC to be returned if the netmsg function disposes of the message. 266 */ 267 void 268 netmsg_sync_handler(netmsg_t msg) 269 { 270 lwkt_replymsg(&msg->lmsg, 0); 271 } 272 273 /* 274 * Generic netmsg service loop. Some protocols may roll their own but all 275 * must do the basic command dispatch function call done here. 276 */ 277 static void 278 netmsg_service_loop(void *arg) 279 { 280 struct netmsg_rollup *ru; 281 netmsg_base_t msg; 282 thread_t td = curthread; 283 int limit; 284 285 td->td_type = TD_TYPE_NETISR; 286 287 while ((msg = lwkt_waitport(&td->td_msgport, 0))) { 288 /* 289 * Run up to 512 pending netmsgs. 290 */ 291 limit = 512; 292 do { 293 KASSERT(msg->nm_dispatch != NULL, 294 ("netmsg_service isr %d badmsg", 295 msg->lmsg.u.ms_result)); 296 /* 297 * Don't match so_port, if the msg explicitly 298 * asks us to ignore its so_port. 299 */ 300 if ((msg->lmsg.ms_flags & MSGF_IGNSOPORT) == 0 && 301 msg->nm_so && 302 msg->nm_so->so_port != &td->td_msgport) { 303 /* 304 * Sockets undergoing connect or disconnect 305 * ops can change ports on us. Chase the 306 * port. 307 */ 308 #ifdef foo 309 /* 310 * This could be quite common for protocols 311 * which support asynchronous pru_connect, 312 * e.g. TCP, so kprintf socket port chasing 313 * could be too verbose for the console. 314 */ 315 kprintf("netmsg_service_loop: Warning, " 316 "port changed so=%p\n", msg->nm_so); 317 #endif 318 lwkt_forwardmsg(msg->nm_so->so_port, 319 &msg->lmsg); 320 } else { 321 /* 322 * We are on the correct port, dispatch it. 323 */ 324 msg->nm_dispatch((netmsg_t)msg); 325 } 326 if (--limit == 0) 327 break; 328 } while ((msg = lwkt_getport(&td->td_msgport)) != NULL); 329 330 /* 331 * Run all registered rollup functions for this cpu 332 * (e.g. tcp_willblock()). 333 */ 334 TAILQ_FOREACH(ru, &netrulist, ru_entry) 335 ru->ru_func(); 336 } 337 } 338 339 /* 340 * Forward a packet to a netisr service function. 341 * 342 * If the packet has not been assigned to a protocol thread we call 343 * the port characterization function to assign it. The caller must 344 * clear M_HASH (or not have set it in the first place) if the caller 345 * wishes the packet to be recharacterized. 346 */ 347 int 348 netisr_queue(int num, struct mbuf *m) 349 { 350 struct netisr *ni; 351 struct netmsg_packet *pmsg; 352 lwkt_port_t port; 353 354 KASSERT((num > 0 && num <= NELEM(netisrs)), 355 ("Bad isr %d", num)); 356 357 ni = &netisrs[num]; 358 if (ni->ni_handler == NULL) { 359 kprintf("Unregistered isr %d\n", num); 360 m_freem(m); 361 return (EIO); 362 } 363 364 /* 365 * Figure out which protocol thread to send to. This does not 366 * have to be perfect but performance will be really good if it 367 * is correct. Major protocol inputs such as ip_input() will 368 * re-characterize the packet as necessary. 369 */ 370 if ((m->m_flags & M_HASH) == 0) { 371 ni->ni_hashfn(&m, 0); 372 if (m == NULL) 373 return (EIO); 374 if ((m->m_flags & M_HASH) == 0) { 375 kprintf("netisr_queue(%d): packet hash failed\n", num); 376 m_freem(m); 377 return (EIO); 378 } 379 } 380 381 /* 382 * Get the protocol port based on the packet hash, initialize 383 * the netmsg, and send it off. 384 */ 385 port = netisr_hashport(m->m_pkthdr.hash); 386 pmsg = &m->m_hdr.mh_netmsg; 387 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 388 0, ni->ni_handler); 389 pmsg->nm_packet = m; 390 pmsg->base.lmsg.u.ms_result = num; 391 lwkt_sendmsg(port, &pmsg->base.lmsg); 392 393 return (0); 394 } 395 396 /* 397 * Run a netisr service function on the packet. 398 * 399 * The packet must have been correctly characterized! 400 */ 401 int 402 netisr_handle(int num, struct mbuf *m) 403 { 404 struct netisr *ni; 405 struct netmsg_packet *pmsg; 406 lwkt_port_t port; 407 408 /* 409 * Get the protocol port based on the packet hash 410 */ 411 KASSERT((m->m_flags & M_HASH), ("packet not characterized")); 412 port = netisr_hashport(m->m_pkthdr.hash); 413 KASSERT(&curthread->td_msgport == port, ("wrong msgport")); 414 415 KASSERT((num > 0 && num <= NELEM(netisrs)), ("bad isr %d", num)); 416 ni = &netisrs[num]; 417 if (ni->ni_handler == NULL) { 418 kprintf("unregistered isr %d\n", num); 419 m_freem(m); 420 return EIO; 421 } 422 423 /* 424 * Initialize the netmsg, and run the handler directly. 425 */ 426 pmsg = &m->m_hdr.mh_netmsg; 427 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 428 0, ni->ni_handler); 429 pmsg->nm_packet = m; 430 pmsg->base.lmsg.u.ms_result = num; 431 ni->ni_handler((netmsg_t)&pmsg->base); 432 433 return 0; 434 } 435 436 /* 437 * Pre-characterization of a deeper portion of the packet for the 438 * requested isr. 439 * 440 * The base of the ISR type (e.g. IP) that we want to characterize is 441 * at (hoff) relative to the beginning of the mbuf. This allows 442 * e.g. ether_characterize() to not have to adjust the m_data/m_len. 443 */ 444 void 445 netisr_characterize(int num, struct mbuf **mp, int hoff) 446 { 447 struct netisr *ni; 448 struct mbuf *m; 449 450 /* 451 * Validation 452 */ 453 m = *mp; 454 KKASSERT(m != NULL); 455 456 if (num < 0 || num >= NETISR_MAX) { 457 if (num == NETISR_MAX) { 458 m->m_flags |= M_HASH; 459 m->m_pkthdr.hash = 0; 460 return; 461 } 462 panic("Bad isr %d", num); 463 } 464 465 /* 466 * Valid netisr? 467 */ 468 ni = &netisrs[num]; 469 if (ni->ni_handler == NULL) { 470 kprintf("Unregistered isr %d\n", num); 471 m_freem(m); 472 *mp = NULL; 473 } 474 475 /* 476 * Characterize the packet 477 */ 478 if ((m->m_flags & M_HASH) == 0) { 479 ni->ni_hashfn(mp, hoff); 480 m = *mp; 481 if (m && (m->m_flags & M_HASH) == 0) 482 kprintf("netisr_queue(%d): packet hash failed\n", num); 483 } 484 } 485 486 void 487 netisr_register(int num, netisr_fn_t handler, netisr_hashfn_t hashfn) 488 { 489 struct netisr *ni; 490 491 KASSERT((num > 0 && num <= NELEM(netisrs)), 492 ("netisr_register: bad isr %d", num)); 493 KKASSERT(handler != NULL); 494 495 if (hashfn == NULL) 496 hashfn = netisr_hashfn0; 497 498 ni = &netisrs[num]; 499 500 ni->ni_handler = handler; 501 ni->ni_hashck = netisr_nohashck; 502 ni->ni_hashfn = hashfn; 503 netmsg_init(&ni->ni_netmsg, NULL, &netisr_adone_rport, 0, NULL); 504 } 505 506 void 507 netisr_register_hashcheck(int num, netisr_hashck_t hashck) 508 { 509 struct netisr *ni; 510 511 KASSERT((num > 0 && num <= NELEM(netisrs)), 512 ("netisr_register: bad isr %d", num)); 513 514 ni = &netisrs[num]; 515 ni->ni_hashck = hashck; 516 } 517 518 void 519 netisr_register_rollup(netisr_ru_t ru_func, int prio) 520 { 521 struct netmsg_rollup *new_ru, *ru; 522 523 new_ru = kmalloc(sizeof(*new_ru), M_TEMP, M_WAITOK|M_ZERO); 524 new_ru->ru_func = ru_func; 525 new_ru->ru_prio = prio; 526 527 /* 528 * Higher priority "rollup" appears first 529 */ 530 TAILQ_FOREACH(ru, &netrulist, ru_entry) { 531 if (ru->ru_prio < new_ru->ru_prio) { 532 TAILQ_INSERT_BEFORE(ru, new_ru, ru_entry); 533 return; 534 } 535 } 536 TAILQ_INSERT_TAIL(&netrulist, new_ru, ru_entry); 537 } 538 539 /* 540 * Return a default protocol control message processing thread port 541 */ 542 lwkt_port_t 543 cpu0_ctlport(int cmd __unused, struct sockaddr *sa __unused, 544 void *extra __unused) 545 { 546 return (&netisr_cpu[0].td_msgport); 547 } 548 549 /* 550 * This is a default netisr packet characterization function which 551 * sets M_HASH. If a netisr is registered with a NULL hashfn function 552 * this one is assigned. 553 * 554 * This function makes no attempt to validate the packet. 555 */ 556 static void 557 netisr_hashfn0(struct mbuf **mp, int hoff __unused) 558 { 559 struct mbuf *m = *mp; 560 561 m->m_flags |= M_HASH; 562 m->m_pkthdr.hash = 0; 563 } 564 565 /* 566 * schednetisr() is used to call the netisr handler from the appropriate 567 * netisr thread for polling and other purposes. 568 * 569 * This function may be called from a hard interrupt or IPI and must be 570 * MP SAFE and non-blocking. We use a fixed per-cpu message instead of 571 * trying to allocate one. We must get ourselves onto the target cpu 572 * to safely check the MSGF_DONE bit on the message but since the message 573 * will be sent to that cpu anyway this does not add any extra work beyond 574 * what lwkt_sendmsg() would have already had to do to schedule the target 575 * thread. 576 */ 577 static void 578 schednetisr_remote(void *data) 579 { 580 int num = (int)(intptr_t)data; 581 struct netisr *ni = &netisrs[num]; 582 lwkt_port_t port = &netisr_cpu[0].td_msgport; 583 netmsg_base_t pmsg; 584 585 pmsg = &netisrs[num].ni_netmsg; 586 if (pmsg->lmsg.ms_flags & MSGF_DONE) { 587 netmsg_init(pmsg, NULL, &netisr_adone_rport, 0, ni->ni_handler); 588 pmsg->lmsg.u.ms_result = num; 589 lwkt_sendmsg(port, &pmsg->lmsg); 590 } 591 } 592 593 void 594 schednetisr(int num) 595 { 596 KASSERT((num > 0 && num <= NELEM(netisrs)), 597 ("schednetisr: bad isr %d", num)); 598 KKASSERT(netisrs[num].ni_handler != NULL); 599 if (mycpu->gd_cpuid != 0) { 600 lwkt_send_ipiq(globaldata_find(0), 601 schednetisr_remote, (void *)(intptr_t)num); 602 } else { 603 crit_enter(); 604 schednetisr_remote((void *)(intptr_t)num); 605 crit_exit(); 606 } 607 } 608 609 static void 610 netisr_barrier_dispatch(netmsg_t nmsg) 611 { 612 struct netmsg_barrier *msg = (struct netmsg_barrier *)nmsg; 613 614 atomic_clear_cpumask(msg->br_cpumask, mycpu->gd_cpumask); 615 if (*msg->br_cpumask == 0) 616 wakeup(msg->br_cpumask); 617 618 for (;;) { 619 uint32_t done = msg->br_done; 620 621 cpu_ccfence(); 622 if ((done & NETISR_BR_NOTDONE) == 0) 623 break; 624 625 tsleep_interlock(&msg->br_done, 0); 626 if (atomic_cmpset_int(&msg->br_done, 627 done, done | NETISR_BR_WAITDONE)) 628 tsleep(&msg->br_done, PINTERLOCKED, "nbrdsp", 0); 629 } 630 631 lwkt_replymsg(&nmsg->lmsg, 0); 632 } 633 634 struct netisr_barrier * 635 netisr_barrier_create(void) 636 { 637 struct netisr_barrier *br; 638 639 br = kmalloc(sizeof(*br), M_LWKTMSG, M_WAITOK | M_ZERO); 640 return br; 641 } 642 643 void 644 netisr_barrier_set(struct netisr_barrier *br) 645 { 646 volatile cpumask_t other_cpumask; 647 int i, cur_cpuid; 648 649 KKASSERT(&curthread->td_msgport == netisr_cpuport(0)); 650 KKASSERT(!br->br_isset); 651 652 other_cpumask = mycpu->gd_other_cpus & smp_active_mask; 653 cur_cpuid = mycpuid; 654 655 for (i = 0; i < ncpus; ++i) { 656 struct netmsg_barrier *msg; 657 658 if (i == cur_cpuid) 659 continue; 660 661 msg = kmalloc(sizeof(struct netmsg_barrier), 662 M_LWKTMSG, M_WAITOK); 663 664 /* 665 * Don't use priority message here; mainly to keep 666 * it ordered w/ the previous data packets sent by 667 * the caller. 668 */ 669 netmsg_init(&msg->base, NULL, &netisr_afree_rport, 0, 670 netisr_barrier_dispatch); 671 msg->br_cpumask = &other_cpumask; 672 msg->br_done = NETISR_BR_NOTDONE; 673 674 KKASSERT(br->br_msgs[i] == NULL); 675 br->br_msgs[i] = msg; 676 } 677 678 for (i = 0; i < ncpus; ++i) { 679 if (i == cur_cpuid) 680 continue; 681 lwkt_sendmsg(netisr_cpuport(i), &br->br_msgs[i]->base.lmsg); 682 } 683 684 while (other_cpumask != 0) { 685 tsleep_interlock(&other_cpumask, 0); 686 if (other_cpumask != 0) 687 tsleep(&other_cpumask, PINTERLOCKED, "nbrset", 0); 688 } 689 br->br_isset = 1; 690 } 691 692 void 693 netisr_barrier_rem(struct netisr_barrier *br) 694 { 695 int i, cur_cpuid; 696 697 KKASSERT(&curthread->td_msgport == netisr_cpuport(0)); 698 KKASSERT(br->br_isset); 699 700 cur_cpuid = mycpuid; 701 for (i = 0; i < ncpus; ++i) { 702 struct netmsg_barrier *msg = br->br_msgs[i]; 703 uint32_t done; 704 705 msg = br->br_msgs[i]; 706 br->br_msgs[i] = NULL; 707 708 if (i == cur_cpuid) 709 continue; 710 711 done = atomic_swap_int(&msg->br_done, 0); 712 if (done & NETISR_BR_WAITDONE) 713 wakeup(&msg->br_done); 714 } 715 br->br_isset = 0; 716 } 717 718 static void 719 netisr_nohashck(struct mbuf *m, const struct pktinfo *pi __unused) 720 { 721 m->m_flags &= ~M_HASH; 722 } 723 724 void 725 netisr_hashcheck(int num, struct mbuf *m, const struct pktinfo *pi) 726 { 727 struct netisr *ni; 728 729 if (num < 0 || num >= NETISR_MAX) 730 panic("Bad isr %d", num); 731 732 /* 733 * Valid netisr? 734 */ 735 ni = &netisrs[num]; 736 if (ni->ni_handler == NULL) 737 panic("Unregistered isr %d", num); 738 739 ni->ni_hashck(m, pi); 740 } 741