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_port_init(lwkt_port_t); 61 static void netmsg_service_loop(void *arg); 62 static void netisr_hashfn0(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 int ru_prio; 74 }; 75 76 struct netmsg_barrier { 77 struct netmsg_base base; 78 volatile cpumask_t *br_cpumask; 79 volatile uint32_t br_done; 80 }; 81 82 #define NETISR_BR_NOTDONE 0x1 83 #define NETISR_BR_WAITDONE 0x80000000 84 85 struct netisr_barrier { 86 struct netmsg_barrier *br_msgs[MAXCPU]; 87 int br_isset; 88 }; 89 90 void *netlastfunc[MAXCPU]; 91 static struct netisr netisrs[NETISR_MAX]; 92 static TAILQ_HEAD(,netmsg_port_registration) netreglist; 93 static TAILQ_HEAD(,netmsg_rollup) netrulist; 94 95 /* Per-CPU thread to handle any protocol. */ 96 struct thread *netisr_threads[MAXCPU]; 97 98 lwkt_port netisr_afree_rport; 99 lwkt_port netisr_afree_free_so_rport; 100 lwkt_port netisr_adone_rport; 101 lwkt_port netisr_apanic_rport; 102 lwkt_port netisr_sync_port; 103 104 static int (*netmsg_fwd_port_fn)(lwkt_port_t, lwkt_msg_t); 105 106 SYSCTL_NODE(_net, OID_AUTO, netisr, CTLFLAG_RW, 0, "netisr"); 107 108 static int netisr_rollup_limit = 32; 109 SYSCTL_INT(_net_netisr, OID_AUTO, rollup_limit, CTLFLAG_RW, 110 &netisr_rollup_limit, 0, "Message to process before rollup"); 111 112 int netisr_ncpus; 113 TUNABLE_INT("net.netisr.ncpus", &netisr_ncpus); 114 SYSCTL_INT(_net_netisr, OID_AUTO, ncpus, CTLFLAG_RD, 115 &netisr_ncpus, 0, "# of CPUs to handle network messages"); 116 117 /* 118 * netisr_afree_rport replymsg function, only used to handle async 119 * messages which the sender has abandoned to their fate. 120 */ 121 static void 122 netisr_autofree_reply(lwkt_port_t port, lwkt_msg_t msg) 123 { 124 kfree(msg, M_LWKTMSG); 125 } 126 127 static void 128 netisr_autofree_free_so_reply(lwkt_port_t port, lwkt_msg_t msg) 129 { 130 sofree(((netmsg_t)msg)->base.nm_so); 131 kfree(msg, M_LWKTMSG); 132 } 133 134 /* 135 * We need a custom putport function to handle the case where the 136 * message target is the current thread's message port. This case 137 * can occur when the TCP or UDP stack does a direct callback to NFS and NFS 138 * then turns around and executes a network operation synchronously. 139 * 140 * To prevent deadlocking, we must execute these self-referential messages 141 * synchronously, effectively turning the message into a glorified direct 142 * procedure call back into the protocol stack. The operation must be 143 * complete on return or we will deadlock, so panic if it isn't. 144 * 145 * However, the target function is under no obligation to immediately 146 * reply the message. It may forward it elsewhere. 147 */ 148 static int 149 netmsg_put_port(lwkt_port_t port, lwkt_msg_t lmsg) 150 { 151 netmsg_base_t nmsg = (void *)lmsg; 152 153 if ((lmsg->ms_flags & MSGF_SYNC) && port == &curthread->td_msgport) { 154 nmsg->nm_dispatch((netmsg_t)nmsg); 155 return(EASYNC); 156 } else { 157 return(netmsg_fwd_port_fn(port, lmsg)); 158 } 159 } 160 161 /* 162 * UNIX DOMAIN sockets still have to run their uipc functions synchronously, 163 * because they depend on the user proc context for a number of things 164 * (like creds) which we have not yet incorporated into the message structure. 165 * 166 * However, we maintain or message/port abstraction. Having a special 167 * synchronous port which runs the commands synchronously gives us the 168 * ability to serialize operations in one place later on when we start 169 * removing the BGL. 170 */ 171 static int 172 netmsg_sync_putport(lwkt_port_t port, lwkt_msg_t lmsg) 173 { 174 netmsg_base_t nmsg = (void *)lmsg; 175 176 KKASSERT((lmsg->ms_flags & MSGF_DONE) == 0); 177 178 lmsg->ms_target_port = port; /* required for abort */ 179 nmsg->nm_dispatch((netmsg_t)nmsg); 180 return(EASYNC); 181 } 182 183 static void 184 netisr_init(void) 185 { 186 int i; 187 188 if (netisr_ncpus <= 0) { 189 /* Default. */ 190 netisr_ncpus = ncpus2; 191 } else if (netisr_ncpus > ncpus) { 192 netisr_ncpus = ncpus; 193 } 194 if (netisr_ncpus > NETISR_CPUMAX) 195 netisr_ncpus = NETISR_CPUMAX; 196 197 TAILQ_INIT(&netreglist); 198 TAILQ_INIT(&netrulist); 199 200 /* 201 * Create default per-cpu threads for generic protocol handling. 202 */ 203 for (i = 0; i < ncpus; ++i) { 204 lwkt_create(netmsg_service_loop, NULL, &netisr_threads[i], NULL, 205 TDF_NOSTART|TDF_FORCE_SPINPORT|TDF_FIXEDCPU, 206 i, "netisr %d", i); 207 netmsg_service_port_init(&netisr_threads[i]->td_msgport); 208 lwkt_schedule(netisr_threads[i]); 209 } 210 211 /* 212 * The netisr_afree_rport is a special reply port which automatically 213 * frees the replied message. The netisr_adone_rport simply marks 214 * the message as being done. The netisr_apanic_rport panics if 215 * the message is replied to. 216 */ 217 lwkt_initport_replyonly(&netisr_afree_rport, netisr_autofree_reply); 218 lwkt_initport_replyonly(&netisr_afree_free_so_rport, 219 netisr_autofree_free_so_reply); 220 lwkt_initport_replyonly_null(&netisr_adone_rport); 221 lwkt_initport_panic(&netisr_apanic_rport); 222 223 /* 224 * The netisr_syncport is a special port which executes the message 225 * synchronously and waits for it if EASYNC is returned. 226 */ 227 lwkt_initport_putonly(&netisr_sync_port, netmsg_sync_putport); 228 } 229 SYSINIT(netisr, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, netisr_init, NULL); 230 231 /* 232 * Finish initializing the message port for a netmsg service. This also 233 * registers the port for synchronous cleanup operations such as when an 234 * ifnet is being destroyed. There is no deregistration API yet. 235 */ 236 static void 237 netmsg_service_port_init(lwkt_port_t port) 238 { 239 struct netmsg_port_registration *reg; 240 241 /* 242 * Override the putport function. Our custom function checks for 243 * self-references and executes such commands synchronously. 244 */ 245 if (netmsg_fwd_port_fn == NULL) 246 netmsg_fwd_port_fn = port->mp_putport; 247 KKASSERT(netmsg_fwd_port_fn == port->mp_putport); 248 port->mp_putport = netmsg_put_port; 249 250 /* 251 * Keep track of ports using the netmsg API so we can synchronize 252 * certain operations (such as freeing an ifnet structure) across all 253 * consumers. 254 */ 255 reg = kmalloc(sizeof(*reg), M_TEMP, M_WAITOK|M_ZERO); 256 reg->npr_port = port; 257 TAILQ_INSERT_TAIL(&netreglist, reg, npr_entry); 258 } 259 260 /* 261 * This function synchronizes the caller with all netmsg services. For 262 * example, if an interface is being removed we must make sure that all 263 * packets related to that interface complete processing before the structure 264 * can actually be freed. This sort of synchronization is an alternative to 265 * ref-counting the netif, removing the ref counting overhead in favor of 266 * placing additional overhead in the netif freeing sequence (where it is 267 * inconsequential). 268 */ 269 void 270 netmsg_service_sync(void) 271 { 272 struct netmsg_port_registration *reg; 273 struct netmsg_base smsg; 274 275 netmsg_init(&smsg, NULL, &curthread->td_msgport, 0, netmsg_sync_handler); 276 277 TAILQ_FOREACH(reg, &netreglist, npr_entry) { 278 lwkt_domsg(reg->npr_port, &smsg.lmsg, 0); 279 } 280 } 281 282 /* 283 * The netmsg function simply replies the message. API semantics require 284 * EASYNC to be returned if the netmsg function disposes of the message. 285 */ 286 void 287 netmsg_sync_handler(netmsg_t msg) 288 { 289 lwkt_replymsg(&msg->lmsg, 0); 290 } 291 292 /* 293 * Generic netmsg service loop. Some protocols may roll their own but all 294 * must do the basic command dispatch function call done here. 295 */ 296 static void 297 netmsg_service_loop(void *arg) 298 { 299 struct netmsg_rollup *ru; 300 netmsg_base_t msg; 301 thread_t td = curthread; 302 int limit; 303 304 td->td_type = TD_TYPE_NETISR; 305 306 while ((msg = lwkt_waitport(&td->td_msgport, 0))) { 307 /* 308 * Run up to 512 pending netmsgs. 309 */ 310 limit = netisr_rollup_limit; 311 do { 312 KASSERT(msg->nm_dispatch != NULL, 313 ("netmsg_service isr %d badmsg", 314 msg->lmsg.u.ms_result)); 315 /* 316 * Don't match so_port, if the msg explicitly 317 * asks us to ignore its so_port. 318 */ 319 if ((msg->lmsg.ms_flags & MSGF_IGNSOPORT) == 0 && 320 msg->nm_so && 321 msg->nm_so->so_port != &td->td_msgport) { 322 /* 323 * Sockets undergoing connect or disconnect 324 * ops can change ports on us. Chase the 325 * port. 326 */ 327 #ifdef foo 328 /* 329 * This could be quite common for protocols 330 * which support asynchronous pru_connect, 331 * e.g. TCP, so kprintf socket port chasing 332 * could be too verbose for the console. 333 */ 334 kprintf("%s: Warning, port changed so=%p\n", 335 __func__, msg->nm_so); 336 #endif 337 lwkt_forwardmsg(msg->nm_so->so_port, 338 &msg->lmsg); 339 } else { 340 /* 341 * We are on the correct port, dispatch it. 342 */ 343 netlastfunc[mycpuid] = msg->nm_dispatch; 344 msg->nm_dispatch((netmsg_t)msg); 345 } 346 if (--limit == 0) 347 break; 348 } while ((msg = lwkt_getport(&td->td_msgport)) != NULL); 349 350 /* 351 * Run all registered rollup functions for this cpu 352 * (e.g. tcp_willblock()). 353 */ 354 TAILQ_FOREACH(ru, &netrulist, ru_entry) 355 ru->ru_func(); 356 } 357 } 358 359 /* 360 * Forward a packet to a netisr service function. 361 * 362 * If the packet has not been assigned to a protocol thread we call 363 * the port characterization function to assign it. The caller must 364 * clear M_HASH (or not have set it in the first place) if the caller 365 * wishes the packet to be recharacterized. 366 */ 367 int 368 netisr_queue(int num, struct mbuf *m) 369 { 370 struct netisr *ni; 371 struct netmsg_packet *pmsg; 372 lwkt_port_t port; 373 374 KASSERT((num > 0 && num <= NELEM(netisrs)), 375 ("Bad isr %d", num)); 376 377 ni = &netisrs[num]; 378 if (ni->ni_handler == NULL) { 379 kprintf("%s: Unregistered isr %d\n", __func__, num); 380 m_freem(m); 381 return (EIO); 382 } 383 384 /* 385 * Figure out which protocol thread to send to. This does not 386 * have to be perfect but performance will be really good if it 387 * is correct. Major protocol inputs such as ip_input() will 388 * re-characterize the packet as necessary. 389 */ 390 if ((m->m_flags & M_HASH) == 0) { 391 ni->ni_hashfn(&m, 0); 392 if (m == NULL) 393 return (EIO); 394 if ((m->m_flags & M_HASH) == 0) { 395 kprintf("%s(%d): packet hash failed\n", 396 __func__, num); 397 m_freem(m); 398 return (EIO); 399 } 400 } 401 402 /* 403 * Get the protocol port based on the packet hash, initialize 404 * the netmsg, and send it off. 405 */ 406 port = netisr_hashport(m->m_pkthdr.hash); 407 pmsg = &m->m_hdr.mh_netmsg; 408 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 409 0, ni->ni_handler); 410 pmsg->nm_packet = m; 411 pmsg->base.lmsg.u.ms_result = num; 412 lwkt_sendmsg(port, &pmsg->base.lmsg); 413 414 return (0); 415 } 416 417 /* 418 * Run a netisr service function on the packet. 419 * 420 * The packet must have been correctly characterized! 421 */ 422 int 423 netisr_handle(int num, struct mbuf *m) 424 { 425 struct netisr *ni; 426 struct netmsg_packet *pmsg; 427 lwkt_port_t port; 428 429 /* 430 * Get the protocol port based on the packet hash 431 */ 432 KASSERT((m->m_flags & M_HASH), ("packet not characterized")); 433 port = netisr_hashport(m->m_pkthdr.hash); 434 KASSERT(&curthread->td_msgport == port, ("wrong msgport")); 435 436 KASSERT((num > 0 && num <= NELEM(netisrs)), ("bad isr %d", num)); 437 ni = &netisrs[num]; 438 if (ni->ni_handler == NULL) { 439 kprintf("%s: unregistered isr %d\n", __func__, num); 440 m_freem(m); 441 return EIO; 442 } 443 444 /* 445 * Initialize the netmsg, and run the handler directly. 446 */ 447 pmsg = &m->m_hdr.mh_netmsg; 448 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 449 0, ni->ni_handler); 450 pmsg->nm_packet = m; 451 pmsg->base.lmsg.u.ms_result = num; 452 ni->ni_handler((netmsg_t)&pmsg->base); 453 454 return 0; 455 } 456 457 /* 458 * Pre-characterization of a deeper portion of the packet for the 459 * requested isr. 460 * 461 * The base of the ISR type (e.g. IP) that we want to characterize is 462 * at (hoff) relative to the beginning of the mbuf. This allows 463 * e.g. ether_characterize() to not have to adjust the m_data/m_len. 464 */ 465 void 466 netisr_characterize(int num, struct mbuf **mp, int hoff) 467 { 468 struct netisr *ni; 469 struct mbuf *m; 470 471 /* 472 * Validation 473 */ 474 m = *mp; 475 KKASSERT(m != NULL); 476 477 if (num < 0 || num >= NETISR_MAX) { 478 if (num == NETISR_MAX) { 479 m_sethash(m, 0); 480 return; 481 } 482 panic("Bad isr %d", num); 483 } 484 485 /* 486 * Valid netisr? 487 */ 488 ni = &netisrs[num]; 489 if (ni->ni_handler == NULL) { 490 kprintf("%s: Unregistered isr %d\n", __func__, num); 491 m_freem(m); 492 *mp = NULL; 493 } 494 495 /* 496 * Characterize the packet 497 */ 498 if ((m->m_flags & M_HASH) == 0) { 499 ni->ni_hashfn(mp, hoff); 500 m = *mp; 501 if (m && (m->m_flags & M_HASH) == 0) { 502 kprintf("%s(%d): packet hash failed\n", 503 __func__, num); 504 } 505 } 506 } 507 508 void 509 netisr_register(int num, netisr_fn_t handler, netisr_hashfn_t hashfn) 510 { 511 struct netisr *ni; 512 513 KASSERT((num > 0 && num <= NELEM(netisrs)), 514 ("netisr_register: bad isr %d", num)); 515 KKASSERT(handler != NULL); 516 517 if (hashfn == NULL) 518 hashfn = netisr_hashfn0; 519 520 ni = &netisrs[num]; 521 522 ni->ni_handler = handler; 523 ni->ni_hashck = netisr_nohashck; 524 ni->ni_hashfn = hashfn; 525 netmsg_init(&ni->ni_netmsg, NULL, &netisr_adone_rport, 0, NULL); 526 } 527 528 void 529 netisr_register_hashcheck(int num, netisr_hashck_t hashck) 530 { 531 struct netisr *ni; 532 533 KASSERT((num > 0 && num <= NELEM(netisrs)), 534 ("netisr_register: bad isr %d", num)); 535 536 ni = &netisrs[num]; 537 ni->ni_hashck = hashck; 538 } 539 540 void 541 netisr_register_rollup(netisr_ru_t ru_func, int prio) 542 { 543 struct netmsg_rollup *new_ru, *ru; 544 545 new_ru = kmalloc(sizeof(*new_ru), M_TEMP, M_WAITOK|M_ZERO); 546 new_ru->ru_func = ru_func; 547 new_ru->ru_prio = prio; 548 549 /* 550 * Higher priority "rollup" appears first 551 */ 552 TAILQ_FOREACH(ru, &netrulist, ru_entry) { 553 if (ru->ru_prio < new_ru->ru_prio) { 554 TAILQ_INSERT_BEFORE(ru, new_ru, ru_entry); 555 return; 556 } 557 } 558 TAILQ_INSERT_TAIL(&netrulist, new_ru, ru_entry); 559 } 560 561 /* 562 * Return a default protocol control message processing thread port 563 */ 564 lwkt_port_t 565 cpu0_ctlport(int cmd __unused, struct sockaddr *sa __unused, 566 void *extra __unused, int *cpuid) 567 { 568 *cpuid = 0; 569 return netisr_cpuport(*cpuid); 570 } 571 572 /* 573 * This is a default netisr packet characterization function which 574 * sets M_HASH. If a netisr is registered with a NULL hashfn function 575 * this one is assigned. 576 * 577 * This function makes no attempt to validate the packet. 578 */ 579 static void 580 netisr_hashfn0(struct mbuf **mp, int hoff __unused) 581 { 582 583 m_sethash(*mp, 0); 584 } 585 586 /* 587 * schednetisr() is used to call the netisr handler from the appropriate 588 * netisr thread for polling and other purposes. 589 * 590 * This function may be called from a hard interrupt or IPI and must be 591 * MP SAFE and non-blocking. We use a fixed per-cpu message instead of 592 * trying to allocate one. We must get ourselves onto the target cpu 593 * to safely check the MSGF_DONE bit on the message but since the message 594 * will be sent to that cpu anyway this does not add any extra work beyond 595 * what lwkt_sendmsg() would have already had to do to schedule the target 596 * thread. 597 */ 598 static void 599 schednetisr_remote(void *data) 600 { 601 int num = (int)(intptr_t)data; 602 struct netisr *ni = &netisrs[num]; 603 lwkt_port_t port = &netisr_threads[0]->td_msgport; 604 netmsg_base_t pmsg; 605 606 pmsg = &netisrs[num].ni_netmsg; 607 if (pmsg->lmsg.ms_flags & MSGF_DONE) { 608 netmsg_init(pmsg, NULL, &netisr_adone_rport, 0, ni->ni_handler); 609 pmsg->lmsg.u.ms_result = num; 610 lwkt_sendmsg(port, &pmsg->lmsg); 611 } 612 } 613 614 void 615 schednetisr(int num) 616 { 617 KASSERT((num > 0 && num <= NELEM(netisrs)), 618 ("schednetisr: bad isr %d", num)); 619 KKASSERT(netisrs[num].ni_handler != NULL); 620 if (mycpu->gd_cpuid != 0) { 621 lwkt_send_ipiq(globaldata_find(0), 622 schednetisr_remote, (void *)(intptr_t)num); 623 } else { 624 crit_enter(); 625 schednetisr_remote((void *)(intptr_t)num); 626 crit_exit(); 627 } 628 } 629 630 static void 631 netisr_barrier_dispatch(netmsg_t nmsg) 632 { 633 struct netmsg_barrier *msg = (struct netmsg_barrier *)nmsg; 634 635 ATOMIC_CPUMASK_NANDBIT(*msg->br_cpumask, mycpu->gd_cpuid); 636 if (CPUMASK_TESTZERO(*msg->br_cpumask)) 637 wakeup(msg->br_cpumask); 638 639 for (;;) { 640 uint32_t done = msg->br_done; 641 642 cpu_ccfence(); 643 if ((done & NETISR_BR_NOTDONE) == 0) 644 break; 645 646 tsleep_interlock(&msg->br_done, 0); 647 if (atomic_cmpset_int(&msg->br_done, 648 done, done | NETISR_BR_WAITDONE)) 649 tsleep(&msg->br_done, PINTERLOCKED, "nbrdsp", 0); 650 } 651 652 lwkt_replymsg(&nmsg->lmsg, 0); 653 } 654 655 struct netisr_barrier * 656 netisr_barrier_create(void) 657 { 658 struct netisr_barrier *br; 659 660 br = kmalloc(sizeof(*br), M_LWKTMSG, M_WAITOK | M_ZERO); 661 return br; 662 } 663 664 void 665 netisr_barrier_set(struct netisr_barrier *br) 666 { 667 volatile cpumask_t other_cpumask; 668 int i, cur_cpuid; 669 670 ASSERT_NETISR0; 671 KKASSERT(!br->br_isset); 672 673 other_cpumask = mycpu->gd_other_cpus; 674 CPUMASK_ANDMASK(other_cpumask, smp_active_mask); 675 cur_cpuid = mycpuid; 676 677 for (i = 0; i < ncpus; ++i) { 678 struct netmsg_barrier *msg; 679 680 if (i == cur_cpuid) 681 continue; 682 683 msg = kmalloc(sizeof(struct netmsg_barrier), 684 M_LWKTMSG, M_WAITOK); 685 686 /* 687 * Don't use priority message here; mainly to keep 688 * it ordered w/ the previous data packets sent by 689 * the caller. 690 */ 691 netmsg_init(&msg->base, NULL, &netisr_afree_rport, 0, 692 netisr_barrier_dispatch); 693 msg->br_cpumask = &other_cpumask; 694 msg->br_done = NETISR_BR_NOTDONE; 695 696 KKASSERT(br->br_msgs[i] == NULL); 697 br->br_msgs[i] = msg; 698 } 699 700 for (i = 0; i < ncpus; ++i) { 701 if (i == cur_cpuid) 702 continue; 703 lwkt_sendmsg(netisr_cpuport(i), &br->br_msgs[i]->base.lmsg); 704 } 705 706 while (CPUMASK_TESTNZERO(other_cpumask)) { 707 tsleep_interlock(&other_cpumask, 0); 708 if (CPUMASK_TESTNZERO(other_cpumask)) 709 tsleep(&other_cpumask, PINTERLOCKED, "nbrset", 0); 710 } 711 br->br_isset = 1; 712 } 713 714 void 715 netisr_barrier_rem(struct netisr_barrier *br) 716 { 717 int i, cur_cpuid; 718 719 ASSERT_NETISR0; 720 KKASSERT(br->br_isset); 721 722 cur_cpuid = mycpuid; 723 for (i = 0; i < ncpus; ++i) { 724 struct netmsg_barrier *msg = br->br_msgs[i]; 725 uint32_t done; 726 727 msg = br->br_msgs[i]; 728 br->br_msgs[i] = NULL; 729 730 if (i == cur_cpuid) 731 continue; 732 733 done = atomic_swap_int(&msg->br_done, 0); 734 if (done & NETISR_BR_WAITDONE) 735 wakeup(&msg->br_done); 736 } 737 br->br_isset = 0; 738 } 739 740 static void 741 netisr_nohashck(struct mbuf *m, const struct pktinfo *pi __unused) 742 { 743 m->m_flags &= ~M_HASH; 744 } 745 746 void 747 netisr_hashcheck(int num, struct mbuf *m, const struct pktinfo *pi) 748 { 749 struct netisr *ni; 750 751 if (num < 0 || num >= NETISR_MAX) 752 panic("Bad isr %d", num); 753 754 /* 755 * Valid netisr? 756 */ 757 ni = &netisrs[num]; 758 if (ni->ni_handler == NULL) 759 panic("Unregistered isr %d", num); 760 761 ni->ni_hashck(m, pi); 762 } 763