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 static int netisr_rollup_limit = 32; 105 SYSCTL_INT(_net_netisr, OID_AUTO, rollup_limit, CTLFLAG_RW, 106 &netisr_rollup_limit, 0, "Message to process before rollup"); 107 108 109 /* 110 * netisr_afree_rport replymsg function, only used to handle async 111 * messages which the sender has abandoned to their fate. 112 */ 113 static void 114 netisr_autofree_reply(lwkt_port_t port, lwkt_msg_t msg) 115 { 116 kfree(msg, M_LWKTMSG); 117 } 118 119 static void 120 netisr_autofree_free_so_reply(lwkt_port_t port, lwkt_msg_t msg) 121 { 122 sofree(((netmsg_t)msg)->base.nm_so); 123 kfree(msg, M_LWKTMSG); 124 } 125 126 /* 127 * We need a custom putport function to handle the case where the 128 * message target is the current thread's message port. This case 129 * can occur when the TCP or UDP stack does a direct callback to NFS and NFS 130 * then turns around and executes a network operation synchronously. 131 * 132 * To prevent deadlocking, we must execute these self-referential messages 133 * synchronously, effectively turning the message into a glorified direct 134 * procedure call back into the protocol stack. The operation must be 135 * complete on return or we will deadlock, so panic if it isn't. 136 * 137 * However, the target function is under no obligation to immediately 138 * reply the message. It may forward it elsewhere. 139 */ 140 static int 141 netmsg_put_port(lwkt_port_t port, lwkt_msg_t lmsg) 142 { 143 netmsg_base_t nmsg = (void *)lmsg; 144 145 if ((lmsg->ms_flags & MSGF_SYNC) && port == &curthread->td_msgport) { 146 nmsg->nm_dispatch((netmsg_t)nmsg); 147 return(EASYNC); 148 } else { 149 return(netmsg_fwd_port_fn(port, lmsg)); 150 } 151 } 152 153 /* 154 * UNIX DOMAIN sockets still have to run their uipc functions synchronously, 155 * because they depend on the user proc context for a number of things 156 * (like creds) which we have not yet incorporated into the message structure. 157 * 158 * However, we maintain or message/port abstraction. Having a special 159 * synchronous port which runs the commands synchronously gives us the 160 * ability to serialize operations in one place later on when we start 161 * removing the BGL. 162 */ 163 static int 164 netmsg_sync_putport(lwkt_port_t port, lwkt_msg_t lmsg) 165 { 166 netmsg_base_t nmsg = (void *)lmsg; 167 168 KKASSERT((lmsg->ms_flags & MSGF_DONE) == 0); 169 170 lmsg->ms_target_port = port; /* required for abort */ 171 nmsg->nm_dispatch((netmsg_t)nmsg); 172 return(EASYNC); 173 } 174 175 static void 176 netisr_init(void) 177 { 178 int i; 179 180 TAILQ_INIT(&netreglist); 181 TAILQ_INIT(&netrulist); 182 183 /* 184 * Create default per-cpu threads for generic protocol handling. 185 */ 186 for (i = 0; i < ncpus; ++i) { 187 lwkt_create(netmsg_service_loop, NULL, NULL, 188 &netisr_cpu[i], 189 TDF_NOSTART|TDF_FORCE_SPINPORT|TDF_FIXEDCPU, 190 i, "netisr_cpu %d", i); 191 netmsg_service_port_init(&netisr_cpu[i].td_msgport); 192 lwkt_schedule(&netisr_cpu[i]); 193 } 194 195 /* 196 * The netisr_afree_rport is a special reply port which automatically 197 * frees the replied message. The netisr_adone_rport simply marks 198 * the message as being done. The netisr_apanic_rport panics if 199 * the message is replied to. 200 */ 201 lwkt_initport_replyonly(&netisr_afree_rport, netisr_autofree_reply); 202 lwkt_initport_replyonly(&netisr_afree_free_so_rport, 203 netisr_autofree_free_so_reply); 204 lwkt_initport_replyonly_null(&netisr_adone_rport); 205 lwkt_initport_panic(&netisr_apanic_rport); 206 207 /* 208 * The netisr_syncport is a special port which executes the message 209 * synchronously and waits for it if EASYNC is returned. 210 */ 211 lwkt_initport_putonly(&netisr_sync_port, netmsg_sync_putport); 212 } 213 214 SYSINIT(netisr, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, netisr_init, NULL); 215 216 /* 217 * Finish initializing the message port for a netmsg service. This also 218 * registers the port for synchronous cleanup operations such as when an 219 * ifnet is being destroyed. There is no deregistration API yet. 220 */ 221 void 222 netmsg_service_port_init(lwkt_port_t port) 223 { 224 struct netmsg_port_registration *reg; 225 226 /* 227 * Override the putport function. Our custom function checks for 228 * self-references and executes such commands synchronously. 229 */ 230 if (netmsg_fwd_port_fn == NULL) 231 netmsg_fwd_port_fn = port->mp_putport; 232 KKASSERT(netmsg_fwd_port_fn == port->mp_putport); 233 port->mp_putport = netmsg_put_port; 234 235 /* 236 * Keep track of ports using the netmsg API so we can synchronize 237 * certain operations (such as freeing an ifnet structure) across all 238 * consumers. 239 */ 240 reg = kmalloc(sizeof(*reg), M_TEMP, M_WAITOK|M_ZERO); 241 reg->npr_port = port; 242 TAILQ_INSERT_TAIL(&netreglist, reg, npr_entry); 243 } 244 245 /* 246 * This function synchronizes the caller with all netmsg services. For 247 * example, if an interface is being removed we must make sure that all 248 * packets related to that interface complete processing before the structure 249 * can actually be freed. This sort of synchronization is an alternative to 250 * ref-counting the netif, removing the ref counting overhead in favor of 251 * placing additional overhead in the netif freeing sequence (where it is 252 * inconsequential). 253 */ 254 void 255 netmsg_service_sync(void) 256 { 257 struct netmsg_port_registration *reg; 258 struct netmsg_base smsg; 259 260 netmsg_init(&smsg, NULL, &curthread->td_msgport, 0, netmsg_sync_handler); 261 262 TAILQ_FOREACH(reg, &netreglist, npr_entry) { 263 lwkt_domsg(reg->npr_port, &smsg.lmsg, 0); 264 } 265 } 266 267 /* 268 * The netmsg function simply replies the message. API semantics require 269 * EASYNC to be returned if the netmsg function disposes of the message. 270 */ 271 void 272 netmsg_sync_handler(netmsg_t msg) 273 { 274 lwkt_replymsg(&msg->lmsg, 0); 275 } 276 277 /* 278 * Generic netmsg service loop. Some protocols may roll their own but all 279 * must do the basic command dispatch function call done here. 280 */ 281 static void 282 netmsg_service_loop(void *arg) 283 { 284 struct netmsg_rollup *ru; 285 netmsg_base_t msg; 286 thread_t td = curthread; 287 int limit; 288 289 td->td_type = TD_TYPE_NETISR; 290 291 while ((msg = lwkt_waitport(&td->td_msgport, 0))) { 292 /* 293 * Run up to 512 pending netmsgs. 294 */ 295 limit = netisr_rollup_limit; 296 do { 297 KASSERT(msg->nm_dispatch != NULL, 298 ("netmsg_service isr %d badmsg", 299 msg->lmsg.u.ms_result)); 300 /* 301 * Don't match so_port, if the msg explicitly 302 * asks us to ignore its so_port. 303 */ 304 if ((msg->lmsg.ms_flags & MSGF_IGNSOPORT) == 0 && 305 msg->nm_so && 306 msg->nm_so->so_port != &td->td_msgport) { 307 /* 308 * Sockets undergoing connect or disconnect 309 * ops can change ports on us. Chase the 310 * port. 311 */ 312 #ifdef foo 313 /* 314 * This could be quite common for protocols 315 * which support asynchronous pru_connect, 316 * e.g. TCP, so kprintf socket port chasing 317 * could be too verbose for the console. 318 */ 319 kprintf("%s: Warning, port changed so=%p\n", 320 __func__, msg->nm_so); 321 #endif 322 lwkt_forwardmsg(msg->nm_so->so_port, 323 &msg->lmsg); 324 } else { 325 /* 326 * We are on the correct port, dispatch it. 327 */ 328 msg->nm_dispatch((netmsg_t)msg); 329 } 330 if (--limit == 0) 331 break; 332 } while ((msg = lwkt_getport(&td->td_msgport)) != NULL); 333 334 /* 335 * Run all registered rollup functions for this cpu 336 * (e.g. tcp_willblock()). 337 */ 338 TAILQ_FOREACH(ru, &netrulist, ru_entry) 339 ru->ru_func(); 340 } 341 } 342 343 /* 344 * Forward a packet to a netisr service function. 345 * 346 * If the packet has not been assigned to a protocol thread we call 347 * the port characterization function to assign it. The caller must 348 * clear M_HASH (or not have set it in the first place) if the caller 349 * wishes the packet to be recharacterized. 350 */ 351 int 352 netisr_queue(int num, struct mbuf *m) 353 { 354 struct netisr *ni; 355 struct netmsg_packet *pmsg; 356 lwkt_port_t port; 357 358 KASSERT((num > 0 && num <= NELEM(netisrs)), 359 ("Bad isr %d", num)); 360 361 ni = &netisrs[num]; 362 if (ni->ni_handler == NULL) { 363 kprintf("%s: Unregistered isr %d\n", __func__, num); 364 m_freem(m); 365 return (EIO); 366 } 367 368 /* 369 * Figure out which protocol thread to send to. This does not 370 * have to be perfect but performance will be really good if it 371 * is correct. Major protocol inputs such as ip_input() will 372 * re-characterize the packet as necessary. 373 */ 374 if ((m->m_flags & M_HASH) == 0) { 375 ni->ni_hashfn(&m, 0); 376 if (m == NULL) 377 return (EIO); 378 if ((m->m_flags & M_HASH) == 0) { 379 kprintf("%s(%d): packet hash failed\n", 380 __func__, num); 381 m_freem(m); 382 return (EIO); 383 } 384 } 385 386 /* 387 * Get the protocol port based on the packet hash, initialize 388 * the netmsg, and send it off. 389 */ 390 port = netisr_hashport(m->m_pkthdr.hash); 391 pmsg = &m->m_hdr.mh_netmsg; 392 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 393 0, ni->ni_handler); 394 pmsg->nm_packet = m; 395 pmsg->base.lmsg.u.ms_result = num; 396 lwkt_sendmsg(port, &pmsg->base.lmsg); 397 398 return (0); 399 } 400 401 /* 402 * Run a netisr service function on the packet. 403 * 404 * The packet must have been correctly characterized! 405 */ 406 int 407 netisr_handle(int num, struct mbuf *m) 408 { 409 struct netisr *ni; 410 struct netmsg_packet *pmsg; 411 lwkt_port_t port; 412 413 /* 414 * Get the protocol port based on the packet hash 415 */ 416 KASSERT((m->m_flags & M_HASH), ("packet not characterized")); 417 port = netisr_hashport(m->m_pkthdr.hash); 418 KASSERT(&curthread->td_msgport == port, ("wrong msgport")); 419 420 KASSERT((num > 0 && num <= NELEM(netisrs)), ("bad isr %d", num)); 421 ni = &netisrs[num]; 422 if (ni->ni_handler == NULL) { 423 kprintf("%s: unregistered isr %d\n", __func__, num); 424 m_freem(m); 425 return EIO; 426 } 427 428 /* 429 * Initialize the netmsg, and run the handler directly. 430 */ 431 pmsg = &m->m_hdr.mh_netmsg; 432 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 433 0, ni->ni_handler); 434 pmsg->nm_packet = m; 435 pmsg->base.lmsg.u.ms_result = num; 436 ni->ni_handler((netmsg_t)&pmsg->base); 437 438 return 0; 439 } 440 441 /* 442 * Pre-characterization of a deeper portion of the packet for the 443 * requested isr. 444 * 445 * The base of the ISR type (e.g. IP) that we want to characterize is 446 * at (hoff) relative to the beginning of the mbuf. This allows 447 * e.g. ether_characterize() to not have to adjust the m_data/m_len. 448 */ 449 void 450 netisr_characterize(int num, struct mbuf **mp, int hoff) 451 { 452 struct netisr *ni; 453 struct mbuf *m; 454 455 /* 456 * Validation 457 */ 458 m = *mp; 459 KKASSERT(m != NULL); 460 461 if (num < 0 || num >= NETISR_MAX) { 462 if (num == NETISR_MAX) { 463 m->m_flags |= M_HASH; 464 m->m_pkthdr.hash = 0; 465 return; 466 } 467 panic("Bad isr %d", num); 468 } 469 470 /* 471 * Valid netisr? 472 */ 473 ni = &netisrs[num]; 474 if (ni->ni_handler == NULL) { 475 kprintf("%s: Unregistered isr %d\n", __func__, num); 476 m_freem(m); 477 *mp = NULL; 478 } 479 480 /* 481 * Characterize the packet 482 */ 483 if ((m->m_flags & M_HASH) == 0) { 484 ni->ni_hashfn(mp, hoff); 485 m = *mp; 486 if (m && (m->m_flags & M_HASH) == 0) { 487 kprintf("%s(%d): packet hash failed\n", 488 __func__, num); 489 } 490 } 491 } 492 493 void 494 netisr_register(int num, netisr_fn_t handler, netisr_hashfn_t hashfn) 495 { 496 struct netisr *ni; 497 498 KASSERT((num > 0 && num <= NELEM(netisrs)), 499 ("netisr_register: bad isr %d", num)); 500 KKASSERT(handler != NULL); 501 502 if (hashfn == NULL) 503 hashfn = netisr_hashfn0; 504 505 ni = &netisrs[num]; 506 507 ni->ni_handler = handler; 508 ni->ni_hashck = netisr_nohashck; 509 ni->ni_hashfn = hashfn; 510 netmsg_init(&ni->ni_netmsg, NULL, &netisr_adone_rport, 0, NULL); 511 } 512 513 void 514 netisr_register_hashcheck(int num, netisr_hashck_t hashck) 515 { 516 struct netisr *ni; 517 518 KASSERT((num > 0 && num <= NELEM(netisrs)), 519 ("netisr_register: bad isr %d", num)); 520 521 ni = &netisrs[num]; 522 ni->ni_hashck = hashck; 523 } 524 525 void 526 netisr_register_rollup(netisr_ru_t ru_func, int prio) 527 { 528 struct netmsg_rollup *new_ru, *ru; 529 530 new_ru = kmalloc(sizeof(*new_ru), M_TEMP, M_WAITOK|M_ZERO); 531 new_ru->ru_func = ru_func; 532 new_ru->ru_prio = prio; 533 534 /* 535 * Higher priority "rollup" appears first 536 */ 537 TAILQ_FOREACH(ru, &netrulist, ru_entry) { 538 if (ru->ru_prio < new_ru->ru_prio) { 539 TAILQ_INSERT_BEFORE(ru, new_ru, ru_entry); 540 return; 541 } 542 } 543 TAILQ_INSERT_TAIL(&netrulist, new_ru, ru_entry); 544 } 545 546 /* 547 * Return a default protocol control message processing thread port 548 */ 549 lwkt_port_t 550 cpu0_ctlport(int cmd __unused, struct sockaddr *sa __unused, 551 void *extra __unused, int *cpuid) 552 { 553 *cpuid = 0; 554 return netisr_cpuport(*cpuid); 555 } 556 557 /* 558 * This is a default netisr packet characterization function which 559 * sets M_HASH. If a netisr is registered with a NULL hashfn function 560 * this one is assigned. 561 * 562 * This function makes no attempt to validate the packet. 563 */ 564 static void 565 netisr_hashfn0(struct mbuf **mp, int hoff __unused) 566 { 567 struct mbuf *m = *mp; 568 569 m->m_flags |= M_HASH; 570 m->m_pkthdr.hash = 0; 571 } 572 573 /* 574 * schednetisr() is used to call the netisr handler from the appropriate 575 * netisr thread for polling and other purposes. 576 * 577 * This function may be called from a hard interrupt or IPI and must be 578 * MP SAFE and non-blocking. We use a fixed per-cpu message instead of 579 * trying to allocate one. We must get ourselves onto the target cpu 580 * to safely check the MSGF_DONE bit on the message but since the message 581 * will be sent to that cpu anyway this does not add any extra work beyond 582 * what lwkt_sendmsg() would have already had to do to schedule the target 583 * thread. 584 */ 585 static void 586 schednetisr_remote(void *data) 587 { 588 int num = (int)(intptr_t)data; 589 struct netisr *ni = &netisrs[num]; 590 lwkt_port_t port = &netisr_cpu[0].td_msgport; 591 netmsg_base_t pmsg; 592 593 pmsg = &netisrs[num].ni_netmsg; 594 if (pmsg->lmsg.ms_flags & MSGF_DONE) { 595 netmsg_init(pmsg, NULL, &netisr_adone_rport, 0, ni->ni_handler); 596 pmsg->lmsg.u.ms_result = num; 597 lwkt_sendmsg(port, &pmsg->lmsg); 598 } 599 } 600 601 void 602 schednetisr(int num) 603 { 604 KASSERT((num > 0 && num <= NELEM(netisrs)), 605 ("schednetisr: bad isr %d", num)); 606 KKASSERT(netisrs[num].ni_handler != NULL); 607 if (mycpu->gd_cpuid != 0) { 608 lwkt_send_ipiq(globaldata_find(0), 609 schednetisr_remote, (void *)(intptr_t)num); 610 } else { 611 crit_enter(); 612 schednetisr_remote((void *)(intptr_t)num); 613 crit_exit(); 614 } 615 } 616 617 static void 618 netisr_barrier_dispatch(netmsg_t nmsg) 619 { 620 struct netmsg_barrier *msg = (struct netmsg_barrier *)nmsg; 621 622 ATOMIC_CPUMASK_NANDBIT(*msg->br_cpumask, mycpu->gd_cpuid); 623 if (CPUMASK_TESTZERO(*msg->br_cpumask)) 624 wakeup(msg->br_cpumask); 625 626 for (;;) { 627 uint32_t done = msg->br_done; 628 629 cpu_ccfence(); 630 if ((done & NETISR_BR_NOTDONE) == 0) 631 break; 632 633 tsleep_interlock(&msg->br_done, 0); 634 if (atomic_cmpset_int(&msg->br_done, 635 done, done | NETISR_BR_WAITDONE)) 636 tsleep(&msg->br_done, PINTERLOCKED, "nbrdsp", 0); 637 } 638 639 lwkt_replymsg(&nmsg->lmsg, 0); 640 } 641 642 struct netisr_barrier * 643 netisr_barrier_create(void) 644 { 645 struct netisr_barrier *br; 646 647 br = kmalloc(sizeof(*br), M_LWKTMSG, M_WAITOK | M_ZERO); 648 return br; 649 } 650 651 void 652 netisr_barrier_set(struct netisr_barrier *br) 653 { 654 volatile cpumask_t other_cpumask; 655 int i, cur_cpuid; 656 657 ASSERT_IN_NETISR(0); 658 KKASSERT(!br->br_isset); 659 660 other_cpumask = mycpu->gd_other_cpus; 661 CPUMASK_ANDMASK(other_cpumask, smp_active_mask); 662 cur_cpuid = mycpuid; 663 664 for (i = 0; i < ncpus; ++i) { 665 struct netmsg_barrier *msg; 666 667 if (i == cur_cpuid) 668 continue; 669 670 msg = kmalloc(sizeof(struct netmsg_barrier), 671 M_LWKTMSG, M_WAITOK); 672 673 /* 674 * Don't use priority message here; mainly to keep 675 * it ordered w/ the previous data packets sent by 676 * the caller. 677 */ 678 netmsg_init(&msg->base, NULL, &netisr_afree_rport, 0, 679 netisr_barrier_dispatch); 680 msg->br_cpumask = &other_cpumask; 681 msg->br_done = NETISR_BR_NOTDONE; 682 683 KKASSERT(br->br_msgs[i] == NULL); 684 br->br_msgs[i] = msg; 685 } 686 687 for (i = 0; i < ncpus; ++i) { 688 if (i == cur_cpuid) 689 continue; 690 lwkt_sendmsg(netisr_cpuport(i), &br->br_msgs[i]->base.lmsg); 691 } 692 693 while (CPUMASK_TESTNZERO(other_cpumask)) { 694 tsleep_interlock(&other_cpumask, 0); 695 if (CPUMASK_TESTNZERO(other_cpumask)) 696 tsleep(&other_cpumask, PINTERLOCKED, "nbrset", 0); 697 } 698 br->br_isset = 1; 699 } 700 701 void 702 netisr_barrier_rem(struct netisr_barrier *br) 703 { 704 int i, cur_cpuid; 705 706 ASSERT_IN_NETISR(0); 707 KKASSERT(br->br_isset); 708 709 cur_cpuid = mycpuid; 710 for (i = 0; i < ncpus; ++i) { 711 struct netmsg_barrier *msg = br->br_msgs[i]; 712 uint32_t done; 713 714 msg = br->br_msgs[i]; 715 br->br_msgs[i] = NULL; 716 717 if (i == cur_cpuid) 718 continue; 719 720 done = atomic_swap_int(&msg->br_done, 0); 721 if (done & NETISR_BR_WAITDONE) 722 wakeup(&msg->br_done); 723 } 724 br->br_isset = 0; 725 } 726 727 static void 728 netisr_nohashck(struct mbuf *m, const struct pktinfo *pi __unused) 729 { 730 m->m_flags &= ~M_HASH; 731 } 732 733 void 734 netisr_hashcheck(int num, struct mbuf *m, const struct pktinfo *pi) 735 { 736 struct netisr *ni; 737 738 if (num < 0 || num >= NETISR_MAX) 739 panic("Bad isr %d", num); 740 741 /* 742 * Valid netisr? 743 */ 744 ni = &netisrs[num]; 745 if (ni->ni_handler == NULL) 746 panic("Unregistered isr %d", num); 747 748 ni->ni_hashck(m, pi); 749 } 750