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("netmsg_service_loop: Warning, " 320 "port changed so=%p\n", 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("Unregistered isr %d\n", 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("netisr_queue(%d): packet hash failed\n", num); 380 m_freem(m); 381 return (EIO); 382 } 383 } 384 385 /* 386 * Get the protocol port based on the packet hash, initialize 387 * the netmsg, and send it off. 388 */ 389 port = netisr_hashport(m->m_pkthdr.hash); 390 pmsg = &m->m_hdr.mh_netmsg; 391 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 392 0, ni->ni_handler); 393 pmsg->nm_packet = m; 394 pmsg->base.lmsg.u.ms_result = num; 395 lwkt_sendmsg(port, &pmsg->base.lmsg); 396 397 return (0); 398 } 399 400 /* 401 * Run a netisr service function on the packet. 402 * 403 * The packet must have been correctly characterized! 404 */ 405 int 406 netisr_handle(int num, struct mbuf *m) 407 { 408 struct netisr *ni; 409 struct netmsg_packet *pmsg; 410 lwkt_port_t port; 411 412 /* 413 * Get the protocol port based on the packet hash 414 */ 415 KASSERT((m->m_flags & M_HASH), ("packet not characterized")); 416 port = netisr_hashport(m->m_pkthdr.hash); 417 KASSERT(&curthread->td_msgport == port, ("wrong msgport")); 418 419 KASSERT((num > 0 && num <= NELEM(netisrs)), ("bad isr %d", num)); 420 ni = &netisrs[num]; 421 if (ni->ni_handler == NULL) { 422 kprintf("unregistered isr %d\n", num); 423 m_freem(m); 424 return EIO; 425 } 426 427 /* 428 * Initialize the netmsg, and run the handler directly. 429 */ 430 pmsg = &m->m_hdr.mh_netmsg; 431 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 432 0, ni->ni_handler); 433 pmsg->nm_packet = m; 434 pmsg->base.lmsg.u.ms_result = num; 435 ni->ni_handler((netmsg_t)&pmsg->base); 436 437 return 0; 438 } 439 440 /* 441 * Pre-characterization of a deeper portion of the packet for the 442 * requested isr. 443 * 444 * The base of the ISR type (e.g. IP) that we want to characterize is 445 * at (hoff) relative to the beginning of the mbuf. This allows 446 * e.g. ether_characterize() to not have to adjust the m_data/m_len. 447 */ 448 void 449 netisr_characterize(int num, struct mbuf **mp, int hoff) 450 { 451 struct netisr *ni; 452 struct mbuf *m; 453 454 /* 455 * Validation 456 */ 457 m = *mp; 458 KKASSERT(m != NULL); 459 460 if (num < 0 || num >= NETISR_MAX) { 461 if (num == NETISR_MAX) { 462 m->m_flags |= M_HASH; 463 m->m_pkthdr.hash = 0; 464 return; 465 } 466 panic("Bad isr %d", num); 467 } 468 469 /* 470 * Valid netisr? 471 */ 472 ni = &netisrs[num]; 473 if (ni->ni_handler == NULL) { 474 kprintf("Unregistered isr %d\n", num); 475 m_freem(m); 476 *mp = NULL; 477 } 478 479 /* 480 * Characterize the packet 481 */ 482 if ((m->m_flags & M_HASH) == 0) { 483 ni->ni_hashfn(mp, hoff); 484 m = *mp; 485 if (m && (m->m_flags & M_HASH) == 0) 486 kprintf("netisr_queue(%d): packet hash failed\n", num); 487 } 488 } 489 490 void 491 netisr_register(int num, netisr_fn_t handler, netisr_hashfn_t hashfn) 492 { 493 struct netisr *ni; 494 495 KASSERT((num > 0 && num <= NELEM(netisrs)), 496 ("netisr_register: bad isr %d", num)); 497 KKASSERT(handler != NULL); 498 499 if (hashfn == NULL) 500 hashfn = netisr_hashfn0; 501 502 ni = &netisrs[num]; 503 504 ni->ni_handler = handler; 505 ni->ni_hashck = netisr_nohashck; 506 ni->ni_hashfn = hashfn; 507 netmsg_init(&ni->ni_netmsg, NULL, &netisr_adone_rport, 0, NULL); 508 } 509 510 void 511 netisr_register_hashcheck(int num, netisr_hashck_t hashck) 512 { 513 struct netisr *ni; 514 515 KASSERT((num > 0 && num <= NELEM(netisrs)), 516 ("netisr_register: bad isr %d", num)); 517 518 ni = &netisrs[num]; 519 ni->ni_hashck = hashck; 520 } 521 522 void 523 netisr_register_rollup(netisr_ru_t ru_func, int prio) 524 { 525 struct netmsg_rollup *new_ru, *ru; 526 527 new_ru = kmalloc(sizeof(*new_ru), M_TEMP, M_WAITOK|M_ZERO); 528 new_ru->ru_func = ru_func; 529 new_ru->ru_prio = prio; 530 531 /* 532 * Higher priority "rollup" appears first 533 */ 534 TAILQ_FOREACH(ru, &netrulist, ru_entry) { 535 if (ru->ru_prio < new_ru->ru_prio) { 536 TAILQ_INSERT_BEFORE(ru, new_ru, ru_entry); 537 return; 538 } 539 } 540 TAILQ_INSERT_TAIL(&netrulist, new_ru, ru_entry); 541 } 542 543 /* 544 * Return a default protocol control message processing thread port 545 */ 546 lwkt_port_t 547 cpu0_ctlport(int cmd __unused, struct sockaddr *sa __unused, 548 void *extra __unused) 549 { 550 return (&netisr_cpu[0].td_msgport); 551 } 552 553 /* 554 * This is a default netisr packet characterization function which 555 * sets M_HASH. If a netisr is registered with a NULL hashfn function 556 * this one is assigned. 557 * 558 * This function makes no attempt to validate the packet. 559 */ 560 static void 561 netisr_hashfn0(struct mbuf **mp, int hoff __unused) 562 { 563 struct mbuf *m = *mp; 564 565 m->m_flags |= M_HASH; 566 m->m_pkthdr.hash = 0; 567 } 568 569 /* 570 * schednetisr() is used to call the netisr handler from the appropriate 571 * netisr thread for polling and other purposes. 572 * 573 * This function may be called from a hard interrupt or IPI and must be 574 * MP SAFE and non-blocking. We use a fixed per-cpu message instead of 575 * trying to allocate one. We must get ourselves onto the target cpu 576 * to safely check the MSGF_DONE bit on the message but since the message 577 * will be sent to that cpu anyway this does not add any extra work beyond 578 * what lwkt_sendmsg() would have already had to do to schedule the target 579 * thread. 580 */ 581 static void 582 schednetisr_remote(void *data) 583 { 584 int num = (int)(intptr_t)data; 585 struct netisr *ni = &netisrs[num]; 586 lwkt_port_t port = &netisr_cpu[0].td_msgport; 587 netmsg_base_t pmsg; 588 589 pmsg = &netisrs[num].ni_netmsg; 590 if (pmsg->lmsg.ms_flags & MSGF_DONE) { 591 netmsg_init(pmsg, NULL, &netisr_adone_rport, 0, ni->ni_handler); 592 pmsg->lmsg.u.ms_result = num; 593 lwkt_sendmsg(port, &pmsg->lmsg); 594 } 595 } 596 597 void 598 schednetisr(int num) 599 { 600 KASSERT((num > 0 && num <= NELEM(netisrs)), 601 ("schednetisr: bad isr %d", num)); 602 KKASSERT(netisrs[num].ni_handler != NULL); 603 if (mycpu->gd_cpuid != 0) { 604 lwkt_send_ipiq(globaldata_find(0), 605 schednetisr_remote, (void *)(intptr_t)num); 606 } else { 607 crit_enter(); 608 schednetisr_remote((void *)(intptr_t)num); 609 crit_exit(); 610 } 611 } 612 613 static void 614 netisr_barrier_dispatch(netmsg_t nmsg) 615 { 616 struct netmsg_barrier *msg = (struct netmsg_barrier *)nmsg; 617 618 ATOMIC_CPUMASK_NANDBIT(*msg->br_cpumask, mycpu->gd_cpuid); 619 if (CPUMASK_TESTZERO(*msg->br_cpumask)) 620 wakeup(msg->br_cpumask); 621 622 for (;;) { 623 uint32_t done = msg->br_done; 624 625 cpu_ccfence(); 626 if ((done & NETISR_BR_NOTDONE) == 0) 627 break; 628 629 tsleep_interlock(&msg->br_done, 0); 630 if (atomic_cmpset_int(&msg->br_done, 631 done, done | NETISR_BR_WAITDONE)) 632 tsleep(&msg->br_done, PINTERLOCKED, "nbrdsp", 0); 633 } 634 635 lwkt_replymsg(&nmsg->lmsg, 0); 636 } 637 638 struct netisr_barrier * 639 netisr_barrier_create(void) 640 { 641 struct netisr_barrier *br; 642 643 br = kmalloc(sizeof(*br), M_LWKTMSG, M_WAITOK | M_ZERO); 644 return br; 645 } 646 647 void 648 netisr_barrier_set(struct netisr_barrier *br) 649 { 650 volatile cpumask_t other_cpumask; 651 int i, cur_cpuid; 652 653 KKASSERT(&curthread->td_msgport == netisr_cpuport(0)); 654 KKASSERT(!br->br_isset); 655 656 other_cpumask = mycpu->gd_other_cpus; 657 CPUMASK_ANDMASK(other_cpumask, smp_active_mask); 658 cur_cpuid = mycpuid; 659 660 for (i = 0; i < ncpus; ++i) { 661 struct netmsg_barrier *msg; 662 663 if (i == cur_cpuid) 664 continue; 665 666 msg = kmalloc(sizeof(struct netmsg_barrier), 667 M_LWKTMSG, M_WAITOK); 668 669 /* 670 * Don't use priority message here; mainly to keep 671 * it ordered w/ the previous data packets sent by 672 * the caller. 673 */ 674 netmsg_init(&msg->base, NULL, &netisr_afree_rport, 0, 675 netisr_barrier_dispatch); 676 msg->br_cpumask = &other_cpumask; 677 msg->br_done = NETISR_BR_NOTDONE; 678 679 KKASSERT(br->br_msgs[i] == NULL); 680 br->br_msgs[i] = msg; 681 } 682 683 for (i = 0; i < ncpus; ++i) { 684 if (i == cur_cpuid) 685 continue; 686 lwkt_sendmsg(netisr_cpuport(i), &br->br_msgs[i]->base.lmsg); 687 } 688 689 while (CPUMASK_TESTNZERO(other_cpumask)) { 690 tsleep_interlock(&other_cpumask, 0); 691 if (CPUMASK_TESTNZERO(other_cpumask)) 692 tsleep(&other_cpumask, PINTERLOCKED, "nbrset", 0); 693 } 694 br->br_isset = 1; 695 } 696 697 void 698 netisr_barrier_rem(struct netisr_barrier *br) 699 { 700 int i, cur_cpuid; 701 702 KKASSERT(&curthread->td_msgport == netisr_cpuport(0)); 703 KKASSERT(br->br_isset); 704 705 cur_cpuid = mycpuid; 706 for (i = 0; i < ncpus; ++i) { 707 struct netmsg_barrier *msg = br->br_msgs[i]; 708 uint32_t done; 709 710 msg = br->br_msgs[i]; 711 br->br_msgs[i] = NULL; 712 713 if (i == cur_cpuid) 714 continue; 715 716 done = atomic_swap_int(&msg->br_done, 0); 717 if (done & NETISR_BR_WAITDONE) 718 wakeup(&msg->br_done); 719 } 720 br->br_isset = 0; 721 } 722 723 static void 724 netisr_nohashck(struct mbuf *m, const struct pktinfo *pi __unused) 725 { 726 m->m_flags &= ~M_HASH; 727 } 728 729 void 730 netisr_hashcheck(int num, struct mbuf *m, const struct pktinfo *pi) 731 { 732 struct netisr *ni; 733 734 if (num < 0 || num >= NETISR_MAX) 735 panic("Bad isr %d", num); 736 737 /* 738 * Valid netisr? 739 */ 740 ni = &netisrs[num]; 741 if (ni->ni_handler == NULL) 742 panic("Unregistered isr %d", num); 743 744 ni->ni_hashck(m, pi); 745 } 746