1/*- 2 * Copyright (c) 2007-2009 Robert N. M. Watson 3 * Copyright (c) 2010-2011 Juniper Networks, Inc. 4 * All rights reserved. 5 * 6 * This software was developed by Robert N. M. Watson under contract 7 * to Juniper Networks, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD$"); 33 34/* 35 * netisr is a packet dispatch service, allowing synchronous (directly 36 * dispatched) and asynchronous (deferred dispatch) processing of packets by 37 * registered protocol handlers. Callers pass a protocol identifier and 38 * packet to netisr, along with a direct dispatch hint, and work will either 39 * be immediately processed by the registered handler, or passed to a 40 * software interrupt (SWI) thread for deferred dispatch. Callers will 41 * generally select one or the other based on: 42 * 43 * - Whether directly dispatching a netisr handler lead to code reentrance or 44 * lock recursion, such as entering the socket code from the socket code. 45 * - Whether directly dispatching a netisr handler lead to recursive 46 * processing, such as when decapsulating several wrapped layers of tunnel 47 * information (IPSEC within IPSEC within ...). 48 * 49 * Maintaining ordering for protocol streams is a critical design concern. 50 * Enforcing ordering limits the opportunity for concurrency, but maintains 51 * the strong ordering requirements found in some protocols, such as TCP. Of 52 * related concern is CPU affinity--it is desirable to process all data 53 * associated with a particular stream on the same CPU over time in order to 54 * avoid acquiring locks associated with the connection on different CPUs, 55 * keep connection data in one cache, and to generally encourage associated 56 * user threads to live on the same CPU as the stream. It's also desirable 57 * to avoid lock migration and contention where locks are associated with 58 * more than one flow. 59 * 60 * netisr supports several policy variations, represented by the 61 * NETISR_POLICY_* constants, allowing protocols to play various roles in 62 * identifying flows, assigning work to CPUs, etc. These are described in 63 * netisr.h. 64 */ 65 66#include "opt_ddb.h" 67#include "opt_device_polling.h" 68 69#include <sys/param.h> 70#include <sys/bus.h> 71#include <sys/kernel.h> 72#include <sys/kthread.h> 73#include <sys/interrupt.h> 74#include <sys/lock.h> 75#include <sys/mbuf.h> 76#include <sys/mutex.h> 77#include <sys/pcpu.h> 78#include <sys/proc.h> 79#include <sys/rmlock.h> 80#include <sys/sched.h> 81#include <sys/smp.h> 82#include <sys/socket.h> 83#include <sys/sysctl.h> 84#include <sys/systm.h> 85 86#ifdef DDB 87#include <ddb/ddb.h> 88#endif 89 90#define _WANT_NETISR_INTERNAL /* Enable definitions from netisr_internal.h */ 91#include <net/if.h> 92#include <net/if_var.h> 93#include <net/netisr.h> 94#include <net/netisr_internal.h> 95#include <net/vnet.h> 96 97/*- 98 * Synchronize use and modification of the registered netisr data structures; 99 * acquire a read lock while modifying the set of registered protocols to 100 * prevent partially registered or unregistered protocols from being run. 101 * 102 * The following data structures and fields are protected by this lock: 103 * 104 * - The netisr_proto array, including all fields of struct netisr_proto. 105 * - The nws array, including all fields of struct netisr_worker. 106 * - The nws_array array. 107 * 108 * Note: the NETISR_LOCKING define controls whether read locks are acquired 109 * in packet processing paths requiring netisr registration stability. This 110 * is disabled by default as it can lead to measurable performance 111 * degradation even with rmlocks (3%-6% for loopback ping-pong traffic), and 112 * because netisr registration and unregistration is extremely rare at 113 * runtime. If it becomes more common, this decision should be revisited. 114 * 115 * XXXRW: rmlocks don't support assertions. 116 */ 117static struct rmlock netisr_rmlock; 118#define NETISR_LOCK_INIT() rm_init_flags(&netisr_rmlock, "netisr", \ 119 RM_NOWITNESS) 120#define NETISR_LOCK_ASSERT() 121#define NETISR_RLOCK(tracker) rm_rlock(&netisr_rmlock, (tracker)) 122#define NETISR_RUNLOCK(tracker) rm_runlock(&netisr_rmlock, (tracker)) 123#define NETISR_WLOCK() rm_wlock(&netisr_rmlock) 124#define NETISR_WUNLOCK() rm_wunlock(&netisr_rmlock) 125/* #define NETISR_LOCKING */ 126 127static SYSCTL_NODE(_net, OID_AUTO, isr, CTLFLAG_RW, 0, "netisr"); 128 129/*- 130 * Three global direct dispatch policies are supported: 131 * 132 * NETISR_DISPATCH_QUEUED: All work is deferred for a netisr, regardless of 133 * context (may be overriden by protocols). 134 * 135 * NETISR_DISPATCH_HYBRID: If the executing context allows direct dispatch, 136 * and we're running on the CPU the work would be performed on, then direct 137 * dispatch it if it wouldn't violate ordering constraints on the workstream. 138 * 139 * NETISR_DISPATCH_DIRECT: If the executing context allows direct dispatch, 140 * always direct dispatch. (The default.) 141 * 142 * Notice that changing the global policy could lead to short periods of 143 * misordered processing, but this is considered acceptable as compared to 144 * the complexity of enforcing ordering during policy changes. Protocols can 145 * override the global policy (when they're not doing that, they select 146 * NETISR_DISPATCH_DEFAULT). 147 */ 148#define NETISR_DISPATCH_POLICY_DEFAULT NETISR_DISPATCH_DIRECT 149#define NETISR_DISPATCH_POLICY_MAXSTR 20 /* Used for temporary buffers. */ 150static u_int netisr_dispatch_policy = NETISR_DISPATCH_POLICY_DEFAULT; 151static int sysctl_netisr_dispatch_policy(SYSCTL_HANDLER_ARGS); 152SYSCTL_PROC(_net_isr, OID_AUTO, dispatch, CTLTYPE_STRING | CTLFLAG_RW | 153 CTLFLAG_TUN, 0, 0, sysctl_netisr_dispatch_policy, "A", 154 "netisr dispatch policy"); 155 156/* 157 * Allow the administrator to limit the number of threads (CPUs) to use for 158 * netisr. We don't check netisr_maxthreads before creating the thread for 159 * CPU 0. This must be set at boot. We will create at most one thread per CPU. 160 * By default we initialize this to 1 which would assign just 1 cpu (cpu0) and 161 * therefore only 1 workstream. If set to -1, netisr would use all cpus 162 * (mp_ncpus) and therefore would have those many workstreams. One workstream 163 * per thread (CPU). 164 */ 165static int netisr_maxthreads = 1; /* Max number of threads. */ 166TUNABLE_INT("net.isr.maxthreads", &netisr_maxthreads); 167SYSCTL_INT(_net_isr, OID_AUTO, maxthreads, CTLFLAG_RDTUN, 168 &netisr_maxthreads, 0, 169 "Use at most this many CPUs for netisr processing"); 170 171static int netisr_bindthreads = 0; /* Bind threads to CPUs. */ 172TUNABLE_INT("net.isr.bindthreads", &netisr_bindthreads); 173SYSCTL_INT(_net_isr, OID_AUTO, bindthreads, CTLFLAG_RDTUN, 174 &netisr_bindthreads, 0, "Bind netisr threads to CPUs."); 175 176/* 177 * Limit per-workstream mbuf queue limits s to at most net.isr.maxqlimit, 178 * both for initial configuration and later modification using 179 * netisr_setqlimit(). 180 */ 181#define NETISR_DEFAULT_MAXQLIMIT 10240 182static u_int netisr_maxqlimit = NETISR_DEFAULT_MAXQLIMIT; 183TUNABLE_INT("net.isr.maxqlimit", &netisr_maxqlimit); 184SYSCTL_UINT(_net_isr, OID_AUTO, maxqlimit, CTLFLAG_RDTUN, 185 &netisr_maxqlimit, 0, 186 "Maximum netisr per-protocol, per-CPU queue depth."); 187 188/* 189 * The default per-workstream mbuf queue limit for protocols that don't 190 * initialize the nh_qlimit field of their struct netisr_handler. If this is 191 * set above netisr_maxqlimit, we truncate it to the maximum during boot. 192 */ 193#define NETISR_DEFAULT_DEFAULTQLIMIT 256 194static u_int netisr_defaultqlimit = NETISR_DEFAULT_DEFAULTQLIMIT; 195TUNABLE_INT("net.isr.defaultqlimit", &netisr_defaultqlimit); 196SYSCTL_UINT(_net_isr, OID_AUTO, defaultqlimit, CTLFLAG_RDTUN, 197 &netisr_defaultqlimit, 0, 198 "Default netisr per-protocol, per-CPU queue limit if not set by protocol"); 199 200/* 201 * Store and export the compile-time constant NETISR_MAXPROT limit on the 202 * number of protocols that can register with netisr at a time. This is 203 * required for crashdump analysis, as it sizes netisr_proto[]. 204 */ 205static u_int netisr_maxprot = NETISR_MAXPROT; 206SYSCTL_UINT(_net_isr, OID_AUTO, maxprot, CTLFLAG_RD, 207 &netisr_maxprot, 0, 208 "Compile-time limit on the number of protocols supported by netisr."); 209 210/* 211 * The netisr_proto array describes all registered protocols, indexed by 212 * protocol number. See netisr_internal.h for more details. 213 */ 214static struct netisr_proto netisr_proto[NETISR_MAXPROT]; 215 216/* 217 * Per-CPU workstream data. See netisr_internal.h for more details. 218 */ 219DPCPU_DEFINE(struct netisr_workstream, nws); 220 221/* 222 * Map contiguous values between 0 and nws_count into CPU IDs appropriate for 223 * accessing workstreams. This allows constructions of the form 224 * DPCPU_ID_GET(nws_array[arbitraryvalue % nws_count], nws). 225 */ 226static u_int nws_array[MAXCPU]; 227 228/* 229 * Number of registered workstreams. Will be at most the number of running 230 * CPUs once fully started. 231 */ 232static u_int nws_count; 233SYSCTL_UINT(_net_isr, OID_AUTO, numthreads, CTLFLAG_RD, 234 &nws_count, 0, "Number of extant netisr threads."); 235 236/* 237 * Synchronization for each workstream: a mutex protects all mutable fields 238 * in each stream, including per-protocol state (mbuf queues). The SWI is 239 * woken up if asynchronous dispatch is required. 240 */ 241#define NWS_LOCK(s) mtx_lock(&(s)->nws_mtx) 242#define NWS_LOCK_ASSERT(s) mtx_assert(&(s)->nws_mtx, MA_OWNED) 243#define NWS_UNLOCK(s) mtx_unlock(&(s)->nws_mtx) 244#define NWS_SIGNAL(s) swi_sched((s)->nws_swi_cookie, 0) 245 246/* 247 * Utility routines for protocols that implement their own mapping of flows 248 * to CPUs. 249 */ 250u_int 251netisr_get_cpucount(void) 252{ 253 254 return (nws_count); 255} 256 257u_int 258netisr_get_cpuid(u_int cpunumber) 259{ 260 261 KASSERT(cpunumber < nws_count, ("%s: %u > %u", __func__, cpunumber, 262 nws_count)); 263 264 return (nws_array[cpunumber]); 265} 266 267/* 268 * The default implementation of flow -> CPU ID mapping. 269 * 270 * Non-static so that protocols can use it to map their own work to specific 271 * CPUs in a manner consistent to netisr for affinity purposes. 272 */ 273u_int 274netisr_default_flow2cpu(u_int flowid) 275{ 276 277 return (nws_array[flowid % nws_count]); 278} 279 280/* 281 * Dispatch tunable and sysctl configuration. 282 */ 283struct netisr_dispatch_table_entry { 284 u_int ndte_policy; 285 const char *ndte_policy_str; 286}; 287static const struct netisr_dispatch_table_entry netisr_dispatch_table[] = { 288 { NETISR_DISPATCH_DEFAULT, "default" }, 289 { NETISR_DISPATCH_DEFERRED, "deferred" }, 290 { NETISR_DISPATCH_HYBRID, "hybrid" }, 291 { NETISR_DISPATCH_DIRECT, "direct" }, 292}; 293static const u_int netisr_dispatch_table_len = 294 (sizeof(netisr_dispatch_table) / sizeof(netisr_dispatch_table[0])); 295 296static void 297netisr_dispatch_policy_to_str(u_int dispatch_policy, char *buffer, 298 u_int buflen) 299{ 300 const struct netisr_dispatch_table_entry *ndtep; 301 const char *str; 302 u_int i; 303 304 str = "unknown"; 305 for (i = 0; i < netisr_dispatch_table_len; i++) { 306 ndtep = &netisr_dispatch_table[i]; 307 if (ndtep->ndte_policy == dispatch_policy) { 308 str = ndtep->ndte_policy_str; 309 break; 310 } 311 } 312 snprintf(buffer, buflen, "%s", str); 313} 314 315static int 316netisr_dispatch_policy_from_str(const char *str, u_int *dispatch_policyp) 317{ 318 const struct netisr_dispatch_table_entry *ndtep; 319 u_int i; 320 321 for (i = 0; i < netisr_dispatch_table_len; i++) { 322 ndtep = &netisr_dispatch_table[i]; 323 if (strcmp(ndtep->ndte_policy_str, str) == 0) { 324 *dispatch_policyp = ndtep->ndte_policy; 325 return (0); 326 } 327 } 328 return (EINVAL); 329} 330 331static int 332sysctl_netisr_dispatch_policy(SYSCTL_HANDLER_ARGS) 333{ 334 char tmp[NETISR_DISPATCH_POLICY_MAXSTR]; 335 u_int dispatch_policy; 336 int error; 337 338 netisr_dispatch_policy_to_str(netisr_dispatch_policy, tmp, 339 sizeof(tmp)); 340 error = sysctl_handle_string(oidp, tmp, sizeof(tmp), req); 341 if (error == 0 && req->newptr != NULL) { 342 error = netisr_dispatch_policy_from_str(tmp, 343 &dispatch_policy); 344 if (error == 0 && dispatch_policy == NETISR_DISPATCH_DEFAULT) 345 error = EINVAL; 346 if (error == 0) 347 netisr_dispatch_policy = dispatch_policy; 348 } 349 return (error); 350} 351 352/* 353 * Register a new netisr handler, which requires initializing per-protocol 354 * fields for each workstream. All netisr work is briefly suspended while 355 * the protocol is installed. 356 */ 357void 358netisr_register(const struct netisr_handler *nhp) 359{ 360 struct netisr_work *npwp; 361 const char *name; 362 u_int i, proto; 363 364 proto = nhp->nh_proto; 365 name = nhp->nh_name; 366 367 /* 368 * Test that the requested registration is valid. 369 */ 370 KASSERT(nhp->nh_name != NULL, 371 ("%s: nh_name NULL for %u", __func__, proto)); 372 KASSERT(nhp->nh_handler != NULL, 373 ("%s: nh_handler NULL for %s", __func__, name)); 374 KASSERT(nhp->nh_policy == NETISR_POLICY_SOURCE || 375 nhp->nh_policy == NETISR_POLICY_FLOW || 376 nhp->nh_policy == NETISR_POLICY_CPU, 377 ("%s: unsupported nh_policy %u for %s", __func__, 378 nhp->nh_policy, name)); 379 KASSERT(nhp->nh_policy == NETISR_POLICY_FLOW || 380 nhp->nh_m2flow == NULL, 381 ("%s: nh_policy != FLOW but m2flow defined for %s", __func__, 382 name)); 383 KASSERT(nhp->nh_policy == NETISR_POLICY_CPU || nhp->nh_m2cpuid == NULL, 384 ("%s: nh_policy != CPU but m2cpuid defined for %s", __func__, 385 name)); 386 KASSERT(nhp->nh_policy != NETISR_POLICY_CPU || nhp->nh_m2cpuid != NULL, 387 ("%s: nh_policy == CPU but m2cpuid not defined for %s", __func__, 388 name)); 389 KASSERT(nhp->nh_dispatch == NETISR_DISPATCH_DEFAULT || 390 nhp->nh_dispatch == NETISR_DISPATCH_DEFERRED || 391 nhp->nh_dispatch == NETISR_DISPATCH_HYBRID || 392 nhp->nh_dispatch == NETISR_DISPATCH_DIRECT, 393 ("%s: invalid nh_dispatch (%u)", __func__, nhp->nh_dispatch)); 394 395 KASSERT(proto < NETISR_MAXPROT, 396 ("%s(%u, %s): protocol too big", __func__, proto, name)); 397 398 /* 399 * Test that no existing registration exists for this protocol. 400 */ 401 NETISR_WLOCK(); 402 KASSERT(netisr_proto[proto].np_name == NULL, 403 ("%s(%u, %s): name present", __func__, proto, name)); 404 KASSERT(netisr_proto[proto].np_handler == NULL, 405 ("%s(%u, %s): handler present", __func__, proto, name)); 406 407 netisr_proto[proto].np_name = name; 408 netisr_proto[proto].np_handler = nhp->nh_handler; 409 netisr_proto[proto].np_m2flow = nhp->nh_m2flow; 410 netisr_proto[proto].np_m2cpuid = nhp->nh_m2cpuid; 411 netisr_proto[proto].np_drainedcpu = nhp->nh_drainedcpu; 412 if (nhp->nh_qlimit == 0) 413 netisr_proto[proto].np_qlimit = netisr_defaultqlimit; 414 else if (nhp->nh_qlimit > netisr_maxqlimit) { 415 printf("%s: %s requested queue limit %u capped to " 416 "net.isr.maxqlimit %u\n", __func__, name, nhp->nh_qlimit, 417 netisr_maxqlimit); 418 netisr_proto[proto].np_qlimit = netisr_maxqlimit; 419 } else 420 netisr_proto[proto].np_qlimit = nhp->nh_qlimit; 421 netisr_proto[proto].np_policy = nhp->nh_policy; 422 netisr_proto[proto].np_dispatch = nhp->nh_dispatch; 423 CPU_FOREACH(i) { 424 npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto]; 425 bzero(npwp, sizeof(*npwp)); 426 npwp->nw_qlimit = netisr_proto[proto].np_qlimit; 427 } 428 NETISR_WUNLOCK(); 429} 430 431/* 432 * Clear drop counters across all workstreams for a protocol. 433 */ 434void 435netisr_clearqdrops(const struct netisr_handler *nhp) 436{ 437 struct netisr_work *npwp; 438#ifdef INVARIANTS 439 const char *name; 440#endif 441 u_int i, proto; 442 443 proto = nhp->nh_proto; 444#ifdef INVARIANTS 445 name = nhp->nh_name; 446#endif 447 KASSERT(proto < NETISR_MAXPROT, 448 ("%s(%u): protocol too big for %s", __func__, proto, name)); 449 450 NETISR_WLOCK(); 451 KASSERT(netisr_proto[proto].np_handler != NULL, 452 ("%s(%u): protocol not registered for %s", __func__, proto, 453 name)); 454 455 CPU_FOREACH(i) { 456 npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto]; 457 npwp->nw_qdrops = 0; 458 } 459 NETISR_WUNLOCK(); 460} 461 462/* 463 * Query current drop counters across all workstreams for a protocol. 464 */ 465void 466netisr_getqdrops(const struct netisr_handler *nhp, u_int64_t *qdropp) 467{ 468 struct netisr_work *npwp; 469 struct rm_priotracker tracker; 470#ifdef INVARIANTS 471 const char *name; 472#endif 473 u_int i, proto; 474 475 *qdropp = 0; 476 proto = nhp->nh_proto; 477#ifdef INVARIANTS 478 name = nhp->nh_name; 479#endif 480 KASSERT(proto < NETISR_MAXPROT, 481 ("%s(%u): protocol too big for %s", __func__, proto, name)); 482 483 NETISR_RLOCK(&tracker); 484 KASSERT(netisr_proto[proto].np_handler != NULL, 485 ("%s(%u): protocol not registered for %s", __func__, proto, 486 name)); 487 488 CPU_FOREACH(i) { 489 npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto]; 490 *qdropp += npwp->nw_qdrops; 491 } 492 NETISR_RUNLOCK(&tracker); 493} 494 495/* 496 * Query current per-workstream queue limit for a protocol. 497 */ 498void 499netisr_getqlimit(const struct netisr_handler *nhp, u_int *qlimitp) 500{ 501 struct rm_priotracker tracker; 502#ifdef INVARIANTS 503 const char *name; 504#endif 505 u_int proto; 506 507 proto = nhp->nh_proto; 508#ifdef INVARIANTS 509 name = nhp->nh_name; 510#endif 511 KASSERT(proto < NETISR_MAXPROT, 512 ("%s(%u): protocol too big for %s", __func__, proto, name)); 513 514 NETISR_RLOCK(&tracker); 515 KASSERT(netisr_proto[proto].np_handler != NULL, 516 ("%s(%u): protocol not registered for %s", __func__, proto, 517 name)); 518 *qlimitp = netisr_proto[proto].np_qlimit; 519 NETISR_RUNLOCK(&tracker); 520} 521 522/* 523 * Update the queue limit across per-workstream queues for a protocol. We 524 * simply change the limits, and don't drain overflowed packets as they will 525 * (hopefully) take care of themselves shortly. 526 */ 527int 528netisr_setqlimit(const struct netisr_handler *nhp, u_int qlimit) 529{ 530 struct netisr_work *npwp; 531#ifdef INVARIANTS 532 const char *name; 533#endif 534 u_int i, proto; 535 536 if (qlimit > netisr_maxqlimit) 537 return (EINVAL); 538 539 proto = nhp->nh_proto; 540#ifdef INVARIANTS 541 name = nhp->nh_name; 542#endif 543 KASSERT(proto < NETISR_MAXPROT, 544 ("%s(%u): protocol too big for %s", __func__, proto, name)); 545 546 NETISR_WLOCK(); 547 KASSERT(netisr_proto[proto].np_handler != NULL, 548 ("%s(%u): protocol not registered for %s", __func__, proto, 549 name)); 550 551 netisr_proto[proto].np_qlimit = qlimit; 552 CPU_FOREACH(i) { 553 npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto]; 554 npwp->nw_qlimit = qlimit; 555 } 556 NETISR_WUNLOCK(); 557 return (0); 558} 559 560/* 561 * Drain all packets currently held in a particular protocol work queue. 562 */ 563static void 564netisr_drain_proto(struct netisr_work *npwp) 565{ 566 struct mbuf *m; 567 568 /* 569 * We would assert the lock on the workstream but it's not passed in. 570 */ 571 while ((m = npwp->nw_head) != NULL) { 572 npwp->nw_head = m->m_nextpkt; 573 m->m_nextpkt = NULL; 574 if (npwp->nw_head == NULL) 575 npwp->nw_tail = NULL; 576 npwp->nw_len--; 577 m_freem(m); 578 } 579 KASSERT(npwp->nw_tail == NULL, ("%s: tail", __func__)); 580 KASSERT(npwp->nw_len == 0, ("%s: len", __func__)); 581} 582 583/* 584 * Remove the registration of a network protocol, which requires clearing 585 * per-protocol fields across all workstreams, including freeing all mbufs in 586 * the queues at time of unregister. All work in netisr is briefly suspended 587 * while this takes place. 588 */ 589void 590netisr_unregister(const struct netisr_handler *nhp) 591{ 592 struct netisr_work *npwp; 593#ifdef INVARIANTS 594 const char *name; 595#endif 596 u_int i, proto; 597 598 proto = nhp->nh_proto; 599#ifdef INVARIANTS 600 name = nhp->nh_name; 601#endif 602 KASSERT(proto < NETISR_MAXPROT, 603 ("%s(%u): protocol too big for %s", __func__, proto, name)); 604 605 NETISR_WLOCK(); 606 KASSERT(netisr_proto[proto].np_handler != NULL, 607 ("%s(%u): protocol not registered for %s", __func__, proto, 608 name)); 609 610 netisr_proto[proto].np_name = NULL; 611 netisr_proto[proto].np_handler = NULL; 612 netisr_proto[proto].np_m2flow = NULL; 613 netisr_proto[proto].np_m2cpuid = NULL; 614 netisr_proto[proto].np_qlimit = 0; 615 netisr_proto[proto].np_policy = 0; 616 CPU_FOREACH(i) { 617 npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto]; 618 netisr_drain_proto(npwp); 619 bzero(npwp, sizeof(*npwp)); 620 } 621 NETISR_WUNLOCK(); 622} 623 624/* 625 * Compose the global and per-protocol policies on dispatch, and return the 626 * dispatch policy to use. 627 */ 628static u_int 629netisr_get_dispatch(struct netisr_proto *npp) 630{ 631 632 /* 633 * Protocol-specific configuration overrides the global default. 634 */ 635 if (npp->np_dispatch != NETISR_DISPATCH_DEFAULT) 636 return (npp->np_dispatch); 637 return (netisr_dispatch_policy); 638} 639 640/* 641 * Look up the workstream given a packet and source identifier. Do this by 642 * checking the protocol's policy, and optionally call out to the protocol 643 * for assistance if required. 644 */ 645static struct mbuf * 646netisr_select_cpuid(struct netisr_proto *npp, u_int dispatch_policy, 647 uintptr_t source, struct mbuf *m, u_int *cpuidp) 648{ 649 struct ifnet *ifp; 650 u_int policy; 651 652 NETISR_LOCK_ASSERT(); 653 654 /* 655 * In the event we have only one worker, shortcut and deliver to it 656 * without further ado. 657 */ 658 if (nws_count == 1) { 659 *cpuidp = nws_array[0]; 660 return (m); 661 } 662 663 /* 664 * What happens next depends on the policy selected by the protocol. 665 * If we want to support per-interface policies, we should do that 666 * here first. 667 */ 668 policy = npp->np_policy; 669 if (policy == NETISR_POLICY_CPU) { 670 m = npp->np_m2cpuid(m, source, cpuidp); 671 if (m == NULL) 672 return (NULL); 673 674 /* 675 * It's possible for a protocol not to have a good idea about 676 * where to process a packet, in which case we fall back on 677 * the netisr code to decide. In the hybrid case, return the 678 * current CPU ID, which will force an immediate direct 679 * dispatch. In the queued case, fall back on the SOURCE 680 * policy. 681 */ 682 if (*cpuidp != NETISR_CPUID_NONE) 683 return (m); 684 if (dispatch_policy == NETISR_DISPATCH_HYBRID) { 685 *cpuidp = curcpu; 686 return (m); 687 } 688 policy = NETISR_POLICY_SOURCE; 689 } 690 691 if (policy == NETISR_POLICY_FLOW) { 692 if (M_HASHTYPE_GET(m) == M_HASHTYPE_NONE && 693 npp->np_m2flow != NULL) { 694 m = npp->np_m2flow(m, source); 695 if (m == NULL) 696 return (NULL); 697 } 698 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 699 *cpuidp = 700 netisr_default_flow2cpu(m->m_pkthdr.flowid); 701 return (m); 702 } 703 policy = NETISR_POLICY_SOURCE; 704 } 705 706 KASSERT(policy == NETISR_POLICY_SOURCE, 707 ("%s: invalid policy %u for %s", __func__, npp->np_policy, 708 npp->np_name)); 709 710 ifp = m->m_pkthdr.rcvif; 711 if (ifp != NULL) 712 *cpuidp = nws_array[(ifp->if_index + source) % nws_count]; 713 else 714 *cpuidp = nws_array[source % nws_count]; 715 return (m); 716} 717 718/* 719 * Process packets associated with a workstream and protocol. For reasons of 720 * fairness, we process up to one complete netisr queue at a time, moving the 721 * queue to a stack-local queue for processing, but do not loop refreshing 722 * from the global queue. The caller is responsible for deciding whether to 723 * loop, and for setting the NWS_RUNNING flag. The passed workstream will be 724 * locked on entry and relocked before return, but will be released while 725 * processing. The number of packets processed is returned. 726 */ 727static u_int 728netisr_process_workstream_proto(struct netisr_workstream *nwsp, u_int proto) 729{ 730 struct netisr_work local_npw, *npwp; 731 u_int handled; 732 struct mbuf *m; 733 734 NETISR_LOCK_ASSERT(); 735 NWS_LOCK_ASSERT(nwsp); 736 737 KASSERT(nwsp->nws_flags & NWS_RUNNING, 738 ("%s(%u): not running", __func__, proto)); 739 KASSERT(proto >= 0 && proto < NETISR_MAXPROT, 740 ("%s(%u): invalid proto\n", __func__, proto)); 741 742 npwp = &nwsp->nws_work[proto]; 743 if (npwp->nw_len == 0) 744 return (0); 745 746 /* 747 * Move the global work queue to a thread-local work queue. 748 * 749 * Notice that this means the effective maximum length of the queue 750 * is actually twice that of the maximum queue length specified in 751 * the protocol registration call. 752 */ 753 handled = npwp->nw_len; 754 local_npw = *npwp; 755 npwp->nw_head = NULL; 756 npwp->nw_tail = NULL; 757 npwp->nw_len = 0; 758 nwsp->nws_pendingbits &= ~(1 << proto); 759 NWS_UNLOCK(nwsp); 760 while ((m = local_npw.nw_head) != NULL) { 761 local_npw.nw_head = m->m_nextpkt; 762 m->m_nextpkt = NULL; 763 if (local_npw.nw_head == NULL) 764 local_npw.nw_tail = NULL; 765 local_npw.nw_len--; 766 VNET_ASSERT(m->m_pkthdr.rcvif != NULL, 767 ("%s:%d rcvif == NULL: m=%p", __func__, __LINE__, m)); 768 CURVNET_SET(m->m_pkthdr.rcvif->if_vnet); 769 netisr_proto[proto].np_handler(m); 770 CURVNET_RESTORE(); 771 } 772 KASSERT(local_npw.nw_len == 0, 773 ("%s(%u): len %u", __func__, proto, local_npw.nw_len)); 774 if (netisr_proto[proto].np_drainedcpu) 775 netisr_proto[proto].np_drainedcpu(nwsp->nws_cpu); 776 NWS_LOCK(nwsp); 777 npwp->nw_handled += handled; 778 return (handled); 779} 780 781/* 782 * SWI handler for netisr -- processes packets in a set of workstreams that 783 * it owns, woken up by calls to NWS_SIGNAL(). If this workstream is already 784 * being direct dispatched, go back to sleep and wait for the dispatching 785 * thread to wake us up again. 786 */ 787static void 788swi_net(void *arg) 789{ 790#ifdef NETISR_LOCKING 791 struct rm_priotracker tracker; 792#endif 793 struct netisr_workstream *nwsp; 794 u_int bits, prot; 795 796 nwsp = arg; 797 798#ifdef DEVICE_POLLING 799 KASSERT(nws_count == 1, 800 ("%s: device_polling but nws_count != 1", __func__)); 801 netisr_poll(); 802#endif 803#ifdef NETISR_LOCKING 804 NETISR_RLOCK(&tracker); 805#endif 806 NWS_LOCK(nwsp); 807 KASSERT(!(nwsp->nws_flags & NWS_RUNNING), ("swi_net: running")); 808 if (nwsp->nws_flags & NWS_DISPATCHING) 809 goto out; 810 nwsp->nws_flags |= NWS_RUNNING; 811 nwsp->nws_flags &= ~NWS_SCHEDULED; 812 while ((bits = nwsp->nws_pendingbits) != 0) { 813 while ((prot = ffs(bits)) != 0) { 814 prot--; 815 bits &= ~(1 << prot); 816 (void)netisr_process_workstream_proto(nwsp, prot); 817 } 818 } 819 nwsp->nws_flags &= ~NWS_RUNNING; 820out: 821 NWS_UNLOCK(nwsp); 822#ifdef NETISR_LOCKING 823 NETISR_RUNLOCK(&tracker); 824#endif 825#ifdef DEVICE_POLLING 826 netisr_pollmore(); 827#endif 828} 829 830static int 831netisr_queue_workstream(struct netisr_workstream *nwsp, u_int proto, 832 struct netisr_work *npwp, struct mbuf *m, int *dosignalp) 833{ 834 835 NWS_LOCK_ASSERT(nwsp); 836 837 *dosignalp = 0; 838 if (npwp->nw_len < npwp->nw_qlimit) { 839 m->m_nextpkt = NULL; 840 if (npwp->nw_head == NULL) { 841 npwp->nw_head = m; 842 npwp->nw_tail = m; 843 } else { 844 npwp->nw_tail->m_nextpkt = m; 845 npwp->nw_tail = m; 846 } 847 npwp->nw_len++; 848 if (npwp->nw_len > npwp->nw_watermark) 849 npwp->nw_watermark = npwp->nw_len; 850 851 /* 852 * We must set the bit regardless of NWS_RUNNING, so that 853 * swi_net() keeps calling netisr_process_workstream_proto(). 854 */ 855 nwsp->nws_pendingbits |= (1 << proto); 856 if (!(nwsp->nws_flags & 857 (NWS_RUNNING | NWS_DISPATCHING | NWS_SCHEDULED))) { 858 nwsp->nws_flags |= NWS_SCHEDULED; 859 *dosignalp = 1; /* Defer until unlocked. */ 860 } 861 npwp->nw_queued++; 862 return (0); 863 } else { 864 m_freem(m); 865 npwp->nw_qdrops++; 866 return (ENOBUFS); 867 } 868} 869 870static int 871netisr_queue_internal(u_int proto, struct mbuf *m, u_int cpuid) 872{ 873 struct netisr_workstream *nwsp; 874 struct netisr_work *npwp; 875 int dosignal, error; 876 877#ifdef NETISR_LOCKING 878 NETISR_LOCK_ASSERT(); 879#endif 880 KASSERT(cpuid <= mp_maxid, ("%s: cpuid too big (%u, %u)", __func__, 881 cpuid, mp_maxid)); 882 KASSERT(!CPU_ABSENT(cpuid), ("%s: CPU %u absent", __func__, cpuid)); 883 884 dosignal = 0; 885 error = 0; 886 nwsp = DPCPU_ID_PTR(cpuid, nws); 887 npwp = &nwsp->nws_work[proto]; 888 NWS_LOCK(nwsp); 889 error = netisr_queue_workstream(nwsp, proto, npwp, m, &dosignal); 890 NWS_UNLOCK(nwsp); 891 if (dosignal) 892 NWS_SIGNAL(nwsp); 893 return (error); 894} 895 896int 897netisr_queue_src(u_int proto, uintptr_t source, struct mbuf *m) 898{ 899#ifdef NETISR_LOCKING 900 struct rm_priotracker tracker; 901#endif 902 u_int cpuid; 903 int error; 904 905 KASSERT(proto < NETISR_MAXPROT, 906 ("%s: invalid proto %u", __func__, proto)); 907 908#ifdef NETISR_LOCKING 909 NETISR_RLOCK(&tracker); 910#endif 911 KASSERT(netisr_proto[proto].np_handler != NULL, 912 ("%s: invalid proto %u", __func__, proto)); 913 914 m = netisr_select_cpuid(&netisr_proto[proto], NETISR_DISPATCH_DEFERRED, 915 source, m, &cpuid); 916 if (m != NULL) { 917 KASSERT(!CPU_ABSENT(cpuid), ("%s: CPU %u absent", __func__, 918 cpuid)); 919 error = netisr_queue_internal(proto, m, cpuid); 920 } else 921 error = ENOBUFS; 922#ifdef NETISR_LOCKING 923 NETISR_RUNLOCK(&tracker); 924#endif 925 return (error); 926} 927 928int 929netisr_queue(u_int proto, struct mbuf *m) 930{ 931 932 return (netisr_queue_src(proto, 0, m)); 933} 934 935/* 936 * Dispatch a packet for netisr processing; direct dispatch is permitted by 937 * calling context. 938 */ 939int 940netisr_dispatch_src(u_int proto, uintptr_t source, struct mbuf *m) 941{ 942#ifdef NETISR_LOCKING 943 struct rm_priotracker tracker; 944#endif 945 struct netisr_workstream *nwsp; 946 struct netisr_proto *npp; 947 struct netisr_work *npwp; 948 int dosignal, error; 949 u_int cpuid, dispatch_policy; 950 951 KASSERT(proto < NETISR_MAXPROT, 952 ("%s: invalid proto %u", __func__, proto)); 953#ifdef NETISR_LOCKING 954 NETISR_RLOCK(&tracker); 955#endif 956 npp = &netisr_proto[proto]; 957 KASSERT(npp->np_handler != NULL, ("%s: invalid proto %u", __func__, 958 proto)); 959 960 dispatch_policy = netisr_get_dispatch(npp); 961 if (dispatch_policy == NETISR_DISPATCH_DEFERRED) 962 return (netisr_queue_src(proto, source, m)); 963 964 /* 965 * If direct dispatch is forced, then unconditionally dispatch 966 * without a formal CPU selection. Borrow the current CPU's stats, 967 * even if there's no worker on it. In this case we don't update 968 * nws_flags because all netisr processing will be source ordered due 969 * to always being forced to directly dispatch. 970 */ 971 if (dispatch_policy == NETISR_DISPATCH_DIRECT) { 972 nwsp = DPCPU_PTR(nws); 973 npwp = &nwsp->nws_work[proto]; 974 npwp->nw_dispatched++; 975 npwp->nw_handled++; 976 netisr_proto[proto].np_handler(m); 977 error = 0; 978 goto out_unlock; 979 } 980 981 KASSERT(dispatch_policy == NETISR_DISPATCH_HYBRID, 982 ("%s: unknown dispatch policy (%u)", __func__, dispatch_policy)); 983 984 /* 985 * Otherwise, we execute in a hybrid mode where we will try to direct 986 * dispatch if we're on the right CPU and the netisr worker isn't 987 * already running. 988 */ 989 sched_pin(); 990 m = netisr_select_cpuid(&netisr_proto[proto], NETISR_DISPATCH_HYBRID, 991 source, m, &cpuid); 992 if (m == NULL) { 993 error = ENOBUFS; 994 goto out_unpin; 995 } 996 KASSERT(!CPU_ABSENT(cpuid), ("%s: CPU %u absent", __func__, cpuid)); 997 if (cpuid != curcpu) 998 goto queue_fallback; 999 nwsp = DPCPU_PTR(nws); 1000 npwp = &nwsp->nws_work[proto]; 1001 1002 /*- 1003 * We are willing to direct dispatch only if three conditions hold: 1004 * 1005 * (1) The netisr worker isn't already running, 1006 * (2) Another thread isn't already directly dispatching, and 1007 * (3) The netisr hasn't already been woken up. 1008 */ 1009 NWS_LOCK(nwsp); 1010 if (nwsp->nws_flags & (NWS_RUNNING | NWS_DISPATCHING | NWS_SCHEDULED)) { 1011 error = netisr_queue_workstream(nwsp, proto, npwp, m, 1012 &dosignal); 1013 NWS_UNLOCK(nwsp); 1014 if (dosignal) 1015 NWS_SIGNAL(nwsp); 1016 goto out_unpin; 1017 } 1018 1019 /* 1020 * The current thread is now effectively the netisr worker, so set 1021 * the dispatching flag to prevent concurrent processing of the 1022 * stream from another thread (even the netisr worker), which could 1023 * otherwise lead to effective misordering of the stream. 1024 */ 1025 nwsp->nws_flags |= NWS_DISPATCHING; 1026 NWS_UNLOCK(nwsp); 1027 netisr_proto[proto].np_handler(m); 1028 NWS_LOCK(nwsp); 1029 nwsp->nws_flags &= ~NWS_DISPATCHING; 1030 npwp->nw_handled++; 1031 npwp->nw_hybrid_dispatched++; 1032 1033 /* 1034 * If other work was enqueued by another thread while we were direct 1035 * dispatching, we need to signal the netisr worker to do that work. 1036 * In the future, we might want to do some of that work in the 1037 * current thread, rather than trigger further context switches. If 1038 * so, we'll want to establish a reasonable bound on the work done in 1039 * the "borrowed" context. 1040 */ 1041 if (nwsp->nws_pendingbits != 0) { 1042 nwsp->nws_flags |= NWS_SCHEDULED; 1043 dosignal = 1; 1044 } else 1045 dosignal = 0; 1046 NWS_UNLOCK(nwsp); 1047 if (dosignal) 1048 NWS_SIGNAL(nwsp); 1049 error = 0; 1050 goto out_unpin; 1051 1052queue_fallback: 1053 error = netisr_queue_internal(proto, m, cpuid); 1054out_unpin: 1055 sched_unpin(); 1056out_unlock: 1057#ifdef NETISR_LOCKING 1058 NETISR_RUNLOCK(&tracker); 1059#endif 1060 return (error); 1061} 1062 1063int 1064netisr_dispatch(u_int proto, struct mbuf *m) 1065{ 1066 1067 return (netisr_dispatch_src(proto, 0, m)); 1068} 1069 1070#ifdef DEVICE_POLLING 1071/* 1072 * Kernel polling borrows a netisr thread to run interface polling in; this 1073 * function allows kernel polling to request that the netisr thread be 1074 * scheduled even if no packets are pending for protocols. 1075 */ 1076void 1077netisr_sched_poll(void) 1078{ 1079 struct netisr_workstream *nwsp; 1080 1081 nwsp = DPCPU_ID_PTR(nws_array[0], nws); 1082 NWS_SIGNAL(nwsp); 1083} 1084#endif 1085 1086static void 1087netisr_start_swi(u_int cpuid, struct pcpu *pc) 1088{ 1089 char swiname[12]; 1090 struct netisr_workstream *nwsp; 1091 int error; 1092 1093 KASSERT(!CPU_ABSENT(cpuid), ("%s: CPU %u absent", __func__, cpuid)); 1094 1095 nwsp = DPCPU_ID_PTR(cpuid, nws); 1096 mtx_init(&nwsp->nws_mtx, "netisr_mtx", NULL, MTX_DEF); 1097 nwsp->nws_cpu = cpuid; 1098 snprintf(swiname, sizeof(swiname), "netisr %u", cpuid); 1099 error = swi_add(&nwsp->nws_intr_event, swiname, swi_net, nwsp, 1100 SWI_NET, INTR_MPSAFE, &nwsp->nws_swi_cookie); 1101 if (error) 1102 panic("%s: swi_add %d", __func__, error); 1103 pc->pc_netisr = nwsp->nws_intr_event; 1104 if (netisr_bindthreads) { 1105 error = intr_event_bind(nwsp->nws_intr_event, cpuid); 1106 if (error != 0) 1107 printf("%s: cpu %u: intr_event_bind: %d", __func__, 1108 cpuid, error); 1109 } 1110 NETISR_WLOCK(); 1111 nws_array[nws_count] = nwsp->nws_cpu; 1112 nws_count++; 1113 NETISR_WUNLOCK(); 1114} 1115 1116/* 1117 * Initialize the netisr subsystem. We rely on BSS and static initialization 1118 * of most fields in global data structures. 1119 * 1120 * Start a worker thread for the boot CPU so that we can support network 1121 * traffic immediately in case the network stack is used before additional 1122 * CPUs are started (for example, diskless boot). 1123 */ 1124static void 1125netisr_init(void *arg) 1126{ 1127 char tmp[NETISR_DISPATCH_POLICY_MAXSTR]; 1128 u_int dispatch_policy; 1129 int error; 1130 1131 KASSERT(curcpu == 0, ("%s: not on CPU 0", __func__)); 1132 1133 NETISR_LOCK_INIT(); 1134 if (netisr_maxthreads == 0 || netisr_maxthreads < -1 ) 1135 netisr_maxthreads = 1; /* default behavior */ 1136 else if (netisr_maxthreads == -1) 1137 netisr_maxthreads = mp_ncpus; /* use max cpus */ 1138 if (netisr_maxthreads > mp_ncpus) { 1139 printf("netisr_init: forcing maxthreads from %d to %d\n", 1140 netisr_maxthreads, mp_ncpus); 1141 netisr_maxthreads = mp_ncpus; 1142 } 1143 if (netisr_defaultqlimit > netisr_maxqlimit) { 1144 printf("netisr_init: forcing defaultqlimit from %d to %d\n", 1145 netisr_defaultqlimit, netisr_maxqlimit); 1146 netisr_defaultqlimit = netisr_maxqlimit; 1147 } 1148#ifdef DEVICE_POLLING 1149 /* 1150 * The device polling code is not yet aware of how to deal with 1151 * multiple netisr threads, so for the time being compiling in device 1152 * polling disables parallel netisr workers. 1153 */ 1154 if (netisr_maxthreads != 1 || netisr_bindthreads != 0) { 1155 printf("netisr_init: forcing maxthreads to 1 and " 1156 "bindthreads to 0 for device polling\n"); 1157 netisr_maxthreads = 1; 1158 netisr_bindthreads = 0; 1159 } 1160#endif 1161 1162 if (TUNABLE_STR_FETCH("net.isr.dispatch", tmp, sizeof(tmp))) { 1163 error = netisr_dispatch_policy_from_str(tmp, 1164 &dispatch_policy); 1165 if (error == 0 && dispatch_policy == NETISR_DISPATCH_DEFAULT) 1166 error = EINVAL; 1167 if (error == 0) 1168 netisr_dispatch_policy = dispatch_policy; 1169 else 1170 printf( 1171 "%s: invalid dispatch policy %s, using default\n", 1172 __func__, tmp); 1173 } 1174 1175 netisr_start_swi(curcpu, pcpu_find(curcpu)); 1176} 1177SYSINIT(netisr_init, SI_SUB_SOFTINTR, SI_ORDER_FIRST, netisr_init, NULL); 1178 1179/* 1180 * Start worker threads for additional CPUs. No attempt to gracefully handle 1181 * work reassignment, we don't yet support dynamic reconfiguration. 1182 */ 1183static void 1184netisr_start(void *arg) 1185{ 1186 struct pcpu *pc; 1187 1188 STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) { 1189 if (nws_count >= netisr_maxthreads) 1190 break; 1191 /* XXXRW: Is skipping absent CPUs still required here? */ 1192 if (CPU_ABSENT(pc->pc_cpuid)) 1193 continue; 1194 /* Worker will already be present for boot CPU. */ 1195 if (pc->pc_netisr != NULL) 1196 continue; 1197 netisr_start_swi(pc->pc_cpuid, pc); 1198 } 1199} 1200SYSINIT(netisr_start, SI_SUB_SMP, SI_ORDER_MIDDLE, netisr_start, NULL); 1201 1202/* 1203 * Sysctl monitoring for netisr: query a list of registered protocols. 1204 */ 1205static int 1206sysctl_netisr_proto(SYSCTL_HANDLER_ARGS) 1207{ 1208 struct rm_priotracker tracker; 1209 struct sysctl_netisr_proto *snpp, *snp_array; 1210 struct netisr_proto *npp; 1211 u_int counter, proto; 1212 int error; 1213 1214 if (req->newptr != NULL) 1215 return (EINVAL); 1216 snp_array = malloc(sizeof(*snp_array) * NETISR_MAXPROT, M_TEMP, 1217 M_ZERO | M_WAITOK); 1218 counter = 0; 1219 NETISR_RLOCK(&tracker); 1220 for (proto = 0; proto < NETISR_MAXPROT; proto++) { 1221 npp = &netisr_proto[proto]; 1222 if (npp->np_name == NULL) 1223 continue; 1224 snpp = &snp_array[counter]; 1225 snpp->snp_version = sizeof(*snpp); 1226 strlcpy(snpp->snp_name, npp->np_name, NETISR_NAMEMAXLEN); 1227 snpp->snp_proto = proto; 1228 snpp->snp_qlimit = npp->np_qlimit; 1229 snpp->snp_policy = npp->np_policy; 1230 snpp->snp_dispatch = npp->np_dispatch; 1231 if (npp->np_m2flow != NULL) 1232 snpp->snp_flags |= NETISR_SNP_FLAGS_M2FLOW; 1233 if (npp->np_m2cpuid != NULL) 1234 snpp->snp_flags |= NETISR_SNP_FLAGS_M2CPUID; 1235 if (npp->np_drainedcpu != NULL) 1236 snpp->snp_flags |= NETISR_SNP_FLAGS_DRAINEDCPU; 1237 counter++; 1238 } 1239 NETISR_RUNLOCK(&tracker); 1240 KASSERT(counter <= NETISR_MAXPROT, 1241 ("sysctl_netisr_proto: counter too big (%d)", counter)); 1242 error = SYSCTL_OUT(req, snp_array, sizeof(*snp_array) * counter); 1243 free(snp_array, M_TEMP); 1244 return (error); 1245} 1246 1247SYSCTL_PROC(_net_isr, OID_AUTO, proto, 1248 CTLFLAG_RD|CTLTYPE_STRUCT|CTLFLAG_MPSAFE, 0, 0, sysctl_netisr_proto, 1249 "S,sysctl_netisr_proto", 1250 "Return list of protocols registered with netisr"); 1251 1252/* 1253 * Sysctl monitoring for netisr: query a list of workstreams. 1254 */ 1255static int 1256sysctl_netisr_workstream(SYSCTL_HANDLER_ARGS) 1257{ 1258 struct rm_priotracker tracker; 1259 struct sysctl_netisr_workstream *snwsp, *snws_array; 1260 struct netisr_workstream *nwsp; 1261 u_int counter, cpuid; 1262 int error; 1263 1264 if (req->newptr != NULL) 1265 return (EINVAL); 1266 snws_array = malloc(sizeof(*snws_array) * MAXCPU, M_TEMP, 1267 M_ZERO | M_WAITOK); 1268 counter = 0; 1269 NETISR_RLOCK(&tracker); 1270 CPU_FOREACH(cpuid) { 1271 nwsp = DPCPU_ID_PTR(cpuid, nws); 1272 if (nwsp->nws_intr_event == NULL) 1273 continue; 1274 NWS_LOCK(nwsp); 1275 snwsp = &snws_array[counter]; 1276 snwsp->snws_version = sizeof(*snwsp); 1277 1278 /* 1279 * For now, we equate workstream IDs and CPU IDs in the 1280 * kernel, but expose them independently to userspace in case 1281 * that assumption changes in the future. 1282 */ 1283 snwsp->snws_wsid = cpuid; 1284 snwsp->snws_cpu = cpuid; 1285 if (nwsp->nws_intr_event != NULL) 1286 snwsp->snws_flags |= NETISR_SNWS_FLAGS_INTR; 1287 NWS_UNLOCK(nwsp); 1288 counter++; 1289 } 1290 NETISR_RUNLOCK(&tracker); 1291 KASSERT(counter <= MAXCPU, 1292 ("sysctl_netisr_workstream: counter too big (%d)", counter)); 1293 error = SYSCTL_OUT(req, snws_array, sizeof(*snws_array) * counter); 1294 free(snws_array, M_TEMP); 1295 return (error); 1296} 1297 1298SYSCTL_PROC(_net_isr, OID_AUTO, workstream, 1299 CTLFLAG_RD|CTLTYPE_STRUCT|CTLFLAG_MPSAFE, 0, 0, sysctl_netisr_workstream, 1300 "S,sysctl_netisr_workstream", 1301 "Return list of workstreams implemented by netisr"); 1302 1303/* 1304 * Sysctl monitoring for netisr: query per-protocol data across all 1305 * workstreams. 1306 */ 1307static int 1308sysctl_netisr_work(SYSCTL_HANDLER_ARGS) 1309{ 1310 struct rm_priotracker tracker; 1311 struct sysctl_netisr_work *snwp, *snw_array; 1312 struct netisr_workstream *nwsp; 1313 struct netisr_proto *npp; 1314 struct netisr_work *nwp; 1315 u_int counter, cpuid, proto; 1316 int error; 1317 1318 if (req->newptr != NULL) 1319 return (EINVAL); 1320 snw_array = malloc(sizeof(*snw_array) * MAXCPU * NETISR_MAXPROT, 1321 M_TEMP, M_ZERO | M_WAITOK); 1322 counter = 0; 1323 NETISR_RLOCK(&tracker); 1324 CPU_FOREACH(cpuid) { 1325 nwsp = DPCPU_ID_PTR(cpuid, nws); 1326 if (nwsp->nws_intr_event == NULL) 1327 continue; 1328 NWS_LOCK(nwsp); 1329 for (proto = 0; proto < NETISR_MAXPROT; proto++) { 1330 npp = &netisr_proto[proto]; 1331 if (npp->np_name == NULL) 1332 continue; 1333 nwp = &nwsp->nws_work[proto]; 1334 snwp = &snw_array[counter]; 1335 snwp->snw_version = sizeof(*snwp); 1336 snwp->snw_wsid = cpuid; /* See comment above. */ 1337 snwp->snw_proto = proto; 1338 snwp->snw_len = nwp->nw_len; 1339 snwp->snw_watermark = nwp->nw_watermark; 1340 snwp->snw_dispatched = nwp->nw_dispatched; 1341 snwp->snw_hybrid_dispatched = 1342 nwp->nw_hybrid_dispatched; 1343 snwp->snw_qdrops = nwp->nw_qdrops; 1344 snwp->snw_queued = nwp->nw_queued; 1345 snwp->snw_handled = nwp->nw_handled; 1346 counter++; 1347 } 1348 NWS_UNLOCK(nwsp); 1349 } 1350 KASSERT(counter <= MAXCPU * NETISR_MAXPROT, 1351 ("sysctl_netisr_work: counter too big (%d)", counter)); 1352 NETISR_RUNLOCK(&tracker); 1353 error = SYSCTL_OUT(req, snw_array, sizeof(*snw_array) * counter); 1354 free(snw_array, M_TEMP); 1355 return (error); 1356} 1357 1358SYSCTL_PROC(_net_isr, OID_AUTO, work, 1359 CTLFLAG_RD|CTLTYPE_STRUCT|CTLFLAG_MPSAFE, 0, 0, sysctl_netisr_work, 1360 "S,sysctl_netisr_work", 1361 "Return list of per-workstream, per-protocol work in netisr"); 1362 1363#ifdef DDB 1364DB_SHOW_COMMAND(netisr, db_show_netisr) 1365{ 1366 struct netisr_workstream *nwsp; 1367 struct netisr_work *nwp; 1368 int first, proto; 1369 u_int cpuid; 1370 1371 db_printf("%3s %6s %5s %5s %5s %8s %8s %8s %8s\n", "CPU", "Proto", 1372 "Len", "WMark", "Max", "Disp", "HDisp", "Drop", "Queue"); 1373 CPU_FOREACH(cpuid) { 1374 nwsp = DPCPU_ID_PTR(cpuid, nws); 1375 if (nwsp->nws_intr_event == NULL) 1376 continue; 1377 first = 1; 1378 for (proto = 0; proto < NETISR_MAXPROT; proto++) { 1379 if (netisr_proto[proto].np_handler == NULL) 1380 continue; 1381 nwp = &nwsp->nws_work[proto]; 1382 if (first) { 1383 db_printf("%3d ", cpuid); 1384 first = 0; 1385 } else 1386 db_printf("%3s ", ""); 1387 db_printf( 1388 "%6s %5d %5d %5d %8ju %8ju %8ju %8ju\n", 1389 netisr_proto[proto].np_name, nwp->nw_len, 1390 nwp->nw_watermark, nwp->nw_qlimit, 1391 nwp->nw_dispatched, nwp->nw_hybrid_dispatched, 1392 nwp->nw_qdrops, nwp->nw_queued); 1393 } 1394 } 1395} 1396#endif 1397