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/netisr.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_sync_func(netmsg_t msg); 61 static void netmsg_service_loop(void *arg); 62 static void cpu0_cpufn(struct mbuf **mp, int hoff); 63 static void netisr_nohashck(struct mbuf *, const struct pktinfo *); 64 65 struct netmsg_port_registration { 66 TAILQ_ENTRY(netmsg_port_registration) npr_entry; 67 lwkt_port_t npr_port; 68 }; 69 70 struct netmsg_rollup { 71 TAILQ_ENTRY(netmsg_rollup) ru_entry; 72 netisr_ru_t ru_func; 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 static 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], TDF_NOSTART|TDF_FORCE_SPINPORT, 185 i, "netisr_cpu %d", i); 186 netmsg_service_port_init(&netisr_cpu[i].td_msgport); 187 lwkt_schedule(&netisr_cpu[i]); 188 } 189 190 /* 191 * The netisr_afree_rport is a special reply port which automatically 192 * frees the replied message. The netisr_adone_rport simply marks 193 * the message as being done. The netisr_apanic_rport panics if 194 * the message is replied to. 195 */ 196 lwkt_initport_replyonly(&netisr_afree_rport, netisr_autofree_reply); 197 lwkt_initport_replyonly(&netisr_afree_free_so_rport, 198 netisr_autofree_free_so_reply); 199 lwkt_initport_replyonly_null(&netisr_adone_rport); 200 lwkt_initport_panic(&netisr_apanic_rport); 201 202 /* 203 * The netisr_syncport is a special port which executes the message 204 * synchronously and waits for it if EASYNC is returned. 205 */ 206 lwkt_initport_putonly(&netisr_sync_port, netmsg_sync_putport); 207 } 208 209 SYSINIT(netisr, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, netisr_init, NULL); 210 211 /* 212 * Finish initializing the message port for a netmsg service. This also 213 * registers the port for synchronous cleanup operations such as when an 214 * ifnet is being destroyed. There is no deregistration API yet. 215 */ 216 void 217 netmsg_service_port_init(lwkt_port_t port) 218 { 219 struct netmsg_port_registration *reg; 220 221 /* 222 * Override the putport function. Our custom function checks for 223 * self-references and executes such commands synchronously. 224 */ 225 if (netmsg_fwd_port_fn == NULL) 226 netmsg_fwd_port_fn = port->mp_putport; 227 KKASSERT(netmsg_fwd_port_fn == port->mp_putport); 228 port->mp_putport = netmsg_put_port; 229 230 /* 231 * Keep track of ports using the netmsg API so we can synchronize 232 * certain operations (such as freeing an ifnet structure) across all 233 * consumers. 234 */ 235 reg = kmalloc(sizeof(*reg), M_TEMP, M_WAITOK|M_ZERO); 236 reg->npr_port = port; 237 TAILQ_INSERT_TAIL(&netreglist, reg, npr_entry); 238 } 239 240 /* 241 * This function synchronizes the caller with all netmsg services. For 242 * example, if an interface is being removed we must make sure that all 243 * packets related to that interface complete processing before the structure 244 * can actually be freed. This sort of synchronization is an alternative to 245 * ref-counting the netif, removing the ref counting overhead in favor of 246 * placing additional overhead in the netif freeing sequence (where it is 247 * inconsequential). 248 */ 249 void 250 netmsg_service_sync(void) 251 { 252 struct netmsg_port_registration *reg; 253 struct netmsg_base smsg; 254 255 netmsg_init(&smsg, NULL, &curthread->td_msgport, 0, netmsg_sync_func); 256 257 TAILQ_FOREACH(reg, &netreglist, npr_entry) { 258 lwkt_domsg(reg->npr_port, &smsg.lmsg, 0); 259 } 260 } 261 262 /* 263 * The netmsg function simply replies the message. API semantics require 264 * EASYNC to be returned if the netmsg function disposes of the message. 265 */ 266 static void 267 netmsg_sync_func(netmsg_t msg) 268 { 269 lwkt_replymsg(&msg->lmsg, 0); 270 } 271 272 /* 273 * Generic netmsg service loop. Some protocols may roll their own but all 274 * must do the basic command dispatch function call done here. 275 */ 276 static void 277 netmsg_service_loop(void *arg) 278 { 279 struct netmsg_rollup *ru; 280 netmsg_base_t msg; 281 thread_t td = curthread;; 282 int limit; 283 284 while ((msg = lwkt_waitport(&td->td_msgport, 0))) { 285 /* 286 * Run up to 512 pending netmsgs. 287 */ 288 limit = 512; 289 do { 290 KASSERT(msg->nm_dispatch != NULL, 291 ("netmsg_service isr %d badmsg\n", 292 msg->lmsg.u.ms_result)); 293 if (msg->nm_so && 294 msg->nm_so->so_port != &td->td_msgport) { 295 /* 296 * Sockets undergoing connect or disconnect 297 * ops can change ports on us. Chase the 298 * port. 299 */ 300 kprintf("netmsg_service_loop: Warning, " 301 "port changed so=%p\n", msg->nm_so); 302 lwkt_forwardmsg(msg->nm_so->so_port, 303 &msg->lmsg); 304 } else { 305 /* 306 * We are on the correct port, dispatch it. 307 */ 308 msg->nm_dispatch((netmsg_t)msg); 309 } 310 if (--limit == 0) 311 break; 312 } while ((msg = lwkt_getport(&td->td_msgport)) != NULL); 313 314 /* 315 * Run all registered rollup functions for this cpu 316 * (e.g. tcp_willblock()). 317 */ 318 TAILQ_FOREACH(ru, &netrulist, ru_entry) 319 ru->ru_func(); 320 } 321 } 322 323 /* 324 * Forward a packet to a netisr service function. 325 * 326 * If the packet has not been assigned to a protocol thread we call 327 * the port characterization function to assign it. The caller must 328 * clear M_HASH (or not have set it in the first place) if the caller 329 * wishes the packet to be recharacterized. 330 */ 331 int 332 netisr_queue(int num, struct mbuf *m) 333 { 334 struct netisr *ni; 335 struct netmsg_packet *pmsg; 336 lwkt_port_t port; 337 338 KASSERT((num > 0 && num <= NELEM(netisrs)), 339 ("Bad isr %d", num)); 340 341 ni = &netisrs[num]; 342 if (ni->ni_handler == NULL) { 343 kprintf("Unregistered isr %d\n", num); 344 m_freem(m); 345 return (EIO); 346 } 347 348 /* 349 * Figure out which protocol thread to send to. This does not 350 * have to be perfect but performance will be really good if it 351 * is correct. Major protocol inputs such as ip_input() will 352 * re-characterize the packet as necessary. 353 */ 354 if ((m->m_flags & M_HASH) == 0) { 355 ni->ni_cpufn(&m, 0); 356 if (m == NULL) { 357 m_freem(m); 358 return (EIO); 359 } 360 if ((m->m_flags & M_HASH) == 0) { 361 kprintf("netisr_queue(%d): packet hash failed\n", num); 362 m_freem(m); 363 return (EIO); 364 } 365 } 366 367 /* 368 * Get the protocol port based on the packet hash, initialize 369 * the netmsg, and send it off. 370 */ 371 port = cpu_portfn(m->m_pkthdr.hash); 372 pmsg = &m->m_hdr.mh_netmsg; 373 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 374 0, ni->ni_handler); 375 pmsg->nm_packet = m; 376 pmsg->base.lmsg.u.ms_result = num; 377 lwkt_sendmsg(port, &pmsg->base.lmsg); 378 379 return (0); 380 } 381 382 /* 383 * Run a netisr service function on the packet. 384 * 385 * The packet must have been correctly characterized! 386 */ 387 int 388 netisr_handle(int num, struct mbuf *m) 389 { 390 struct netisr *ni; 391 struct netmsg_packet *pmsg; 392 lwkt_port_t port; 393 394 /* 395 * Get the protocol port based on the packet hash 396 */ 397 KASSERT((m->m_flags & M_HASH), ("packet not characterized\n")); 398 port = cpu_portfn(m->m_pkthdr.hash); 399 KASSERT(&curthread->td_msgport == port, ("wrong msgport\n")); 400 401 KASSERT((num > 0 && num <= NELEM(netisrs)), ("bad isr %d", num)); 402 ni = &netisrs[num]; 403 if (ni->ni_handler == NULL) { 404 kprintf("unregistered isr %d\n", num); 405 m_freem(m); 406 return EIO; 407 } 408 409 /* 410 * Initialize the netmsg, and run the handler directly. 411 */ 412 pmsg = &m->m_hdr.mh_netmsg; 413 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 414 0, ni->ni_handler); 415 pmsg->nm_packet = m; 416 pmsg->base.lmsg.u.ms_result = num; 417 ni->ni_handler((netmsg_t)&pmsg->base); 418 419 return 0; 420 } 421 422 /* 423 * Pre-characterization of a deeper portion of the packet for the 424 * requested isr. 425 * 426 * The base of the ISR type (e.g. IP) that we want to characterize is 427 * at (hoff) relative to the beginning of the mbuf. This allows 428 * e.g. ether_input_chain() to not have to adjust the m_data/m_len. 429 */ 430 void 431 netisr_characterize(int num, struct mbuf **mp, int hoff) 432 { 433 struct netisr *ni; 434 struct mbuf *m; 435 436 /* 437 * Validation 438 */ 439 m = *mp; 440 KKASSERT(m != NULL); 441 442 if (num < 0 || num >= NETISR_MAX) { 443 if (num == NETISR_MAX) { 444 m->m_flags |= M_HASH; 445 m->m_pkthdr.hash = 0; 446 return; 447 } 448 panic("Bad isr %d", num); 449 } 450 451 /* 452 * Valid netisr? 453 */ 454 ni = &netisrs[num]; 455 if (ni->ni_handler == NULL) { 456 kprintf("Unregistered isr %d\n", num); 457 m_freem(m); 458 *mp = NULL; 459 } 460 461 /* 462 * Characterize the packet 463 */ 464 if ((m->m_flags & M_HASH) == 0) { 465 ni->ni_cpufn(mp, hoff); 466 m = *mp; 467 if (m && (m->m_flags & M_HASH) == 0) 468 kprintf("netisr_queue(%d): packet hash failed\n", num); 469 } 470 } 471 472 void 473 netisr_register(int num, netisr_fn_t handler, netisr_cpufn_t cpufn) 474 { 475 struct netisr *ni; 476 477 KASSERT((num > 0 && num <= NELEM(netisrs)), 478 ("netisr_register: bad isr %d", num)); 479 KKASSERT(handler != NULL); 480 481 if (cpufn == NULL) 482 cpufn = cpu0_cpufn; 483 484 ni = &netisrs[num]; 485 486 ni->ni_handler = handler; 487 ni->ni_hashck = netisr_nohashck; 488 ni->ni_cpufn = cpufn; 489 netmsg_init(&ni->ni_netmsg, NULL, &netisr_adone_rport, 0, NULL); 490 } 491 492 void 493 netisr_register_hashcheck(int num, netisr_hashck_t hashck) 494 { 495 struct netisr *ni; 496 497 KASSERT((num > 0 && num <= NELEM(netisrs)), 498 ("netisr_register: bad isr %d", num)); 499 500 ni = &netisrs[num]; 501 ni->ni_hashck = hashck; 502 } 503 504 void 505 netisr_register_rollup(netisr_ru_t ru_func) 506 { 507 struct netmsg_rollup *ru; 508 509 ru = kmalloc(sizeof(*ru), M_TEMP, M_WAITOK|M_ZERO); 510 ru->ru_func = ru_func; 511 TAILQ_INSERT_TAIL(&netrulist, ru, ru_entry); 512 } 513 514 /* 515 * Return the message port for the general protocol message servicing 516 * thread for a particular cpu. 517 */ 518 lwkt_port_t 519 cpu_portfn(int cpu) 520 { 521 KKASSERT(cpu >= 0 && cpu < ncpus); 522 return (&netisr_cpu[cpu].td_msgport); 523 } 524 525 /* 526 * Return the current cpu's network protocol thread. 527 */ 528 lwkt_port_t 529 cur_netport(void) 530 { 531 return(cpu_portfn(mycpu->gd_cpuid)); 532 } 533 534 /* 535 * Return a default protocol control message processing thread port 536 */ 537 lwkt_port_t 538 cpu0_ctlport(int cmd __unused, struct sockaddr *sa __unused, 539 void *extra __unused) 540 { 541 return (&netisr_cpu[0].td_msgport); 542 } 543 544 /* 545 * This is a default netisr packet characterization function which 546 * sets M_HASH. If a netisr is registered with a NULL cpufn function 547 * this one is assigned. 548 * 549 * This function makes no attempt to validate the packet. 550 */ 551 static void 552 cpu0_cpufn(struct mbuf **mp, int hoff __unused) 553 { 554 struct mbuf *m = *mp; 555 556 m->m_flags |= M_HASH; 557 m->m_pkthdr.hash = 0; 558 } 559 560 /* 561 * schednetisr() is used to call the netisr handler from the appropriate 562 * netisr thread for polling and other purposes. 563 * 564 * This function may be called from a hard interrupt or IPI and must be 565 * MP SAFE and non-blocking. We use a fixed per-cpu message instead of 566 * trying to allocate one. We must get ourselves onto the target cpu 567 * to safely check the MSGF_DONE bit on the message but since the message 568 * will be sent to that cpu anyway this does not add any extra work beyond 569 * what lwkt_sendmsg() would have already had to do to schedule the target 570 * thread. 571 */ 572 static void 573 schednetisr_remote(void *data) 574 { 575 int num = (int)(intptr_t)data; 576 struct netisr *ni = &netisrs[num]; 577 lwkt_port_t port = &netisr_cpu[0].td_msgport; 578 netmsg_base_t pmsg; 579 580 pmsg = &netisrs[num].ni_netmsg; 581 if (pmsg->lmsg.ms_flags & MSGF_DONE) { 582 netmsg_init(pmsg, NULL, &netisr_adone_rport, 0, ni->ni_handler); 583 pmsg->lmsg.u.ms_result = num; 584 lwkt_sendmsg(port, &pmsg->lmsg); 585 } 586 } 587 588 void 589 schednetisr(int num) 590 { 591 KASSERT((num > 0 && num <= NELEM(netisrs)), 592 ("schednetisr: bad isr %d", num)); 593 KKASSERT(netisrs[num].ni_handler != NULL); 594 #ifdef SMP 595 if (mycpu->gd_cpuid != 0) { 596 lwkt_send_ipiq(globaldata_find(0), 597 schednetisr_remote, (void *)(intptr_t)num); 598 } else { 599 crit_enter(); 600 schednetisr_remote((void *)(intptr_t)num); 601 crit_exit(); 602 } 603 #else 604 crit_enter(); 605 schednetisr_remote((void *)(intptr_t)num); 606 crit_exit(); 607 #endif 608 } 609 610 #ifdef SMP 611 612 static void 613 netisr_barrier_dispatch(netmsg_t nmsg) 614 { 615 struct netmsg_barrier *msg = (struct netmsg_barrier *)nmsg; 616 617 atomic_clear_cpumask(msg->br_cpumask, mycpu->gd_cpumask); 618 if (*msg->br_cpumask == 0) 619 wakeup(msg->br_cpumask); 620 621 for (;;) { 622 uint32_t done = msg->br_done; 623 624 cpu_ccfence(); 625 if ((done & NETISR_BR_NOTDONE) == 0) 626 break; 627 628 tsleep_interlock(&msg->br_done, 0); 629 if (atomic_cmpset_int(&msg->br_done, 630 done, done | NETISR_BR_WAITDONE)) 631 tsleep(&msg->br_done, PINTERLOCKED, "nbrdsp", 0); 632 } 633 634 lwkt_replymsg(&nmsg->lmsg, 0); 635 } 636 637 #endif 638 639 struct netisr_barrier * 640 netisr_barrier_create(void) 641 { 642 struct netisr_barrier *br; 643 644 br = kmalloc(sizeof(*br), M_LWKTMSG, M_WAITOK | M_ZERO); 645 return br; 646 } 647 648 void 649 netisr_barrier_set(struct netisr_barrier *br) 650 { 651 #ifdef SMP 652 volatile cpumask_t other_cpumask; 653 int i, cur_cpuid; 654 655 KKASSERT(&curthread->td_msgport == cpu_portfn(0)); 656 KKASSERT(!br->br_isset); 657 658 other_cpumask = mycpu->gd_other_cpus & smp_active_mask; 659 cur_cpuid = mycpuid; 660 661 for (i = 0; i < ncpus; ++i) { 662 struct netmsg_barrier *msg; 663 664 if (i == cur_cpuid) 665 continue; 666 667 msg = kmalloc(sizeof(struct netmsg_barrier), 668 M_LWKTMSG, M_WAITOK); 669 netmsg_init(&msg->base, NULL, &netisr_afree_rport, 670 MSGF_PRIORITY, 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(cpu_portfn(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 #endif 690 br->br_isset = 1; 691 } 692 693 void 694 netisr_barrier_rem(struct netisr_barrier *br) 695 { 696 #ifdef SMP 697 int i, cur_cpuid; 698 699 KKASSERT(&curthread->td_msgport == cpu_portfn(0)); 700 KKASSERT(br->br_isset); 701 702 cur_cpuid = mycpuid; 703 for (i = 0; i < ncpus; ++i) { 704 struct netmsg_barrier *msg = br->br_msgs[i]; 705 uint32_t done; 706 707 msg = br->br_msgs[i]; 708 br->br_msgs[i] = NULL; 709 710 if (i == cur_cpuid) 711 continue; 712 713 done = atomic_swap_int(&msg->br_done, 0); 714 if (done & NETISR_BR_WAITDONE) 715 wakeup(&msg->br_done); 716 } 717 #endif 718 br->br_isset = 0; 719 } 720 721 static void 722 netisr_nohashck(struct mbuf *m, const struct pktinfo *pi __unused) 723 { 724 m->m_flags &= ~M_HASH; 725 } 726 727 void 728 netisr_hashcheck(int num, struct mbuf *m, const struct pktinfo *pi) 729 { 730 struct netisr *ni; 731 732 if (num < 0 || num >= NETISR_MAX) 733 panic("Bad isr %d", num); 734 735 /* 736 * Valid netisr? 737 */ 738 ni = &netisrs[num]; 739 if (ni->ni_handler == NULL) 740 panic("Unregistered isr %d\n", num); 741 742 ni->ni_hashck(m, pi); 743 } 744