2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2007-2009 Robert N. M. Watson
5 * Copyright (c) 2010-2011 Juniper Networks, Inc.
8 * This software was developed by Robert N. M. Watson under contract
9 * to Juniper Networks, Inc.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
37 * netisr is a packet dispatch service, allowing synchronous (directly
38 * dispatched) and asynchronous (deferred dispatch) processing of packets by
39 * registered protocol handlers. Callers pass a protocol identifier and
40 * packet to netisr, along with a direct dispatch hint, and work will either
41 * be immediately processed by the registered handler, or passed to a
42 * software interrupt (SWI) thread for deferred dispatch. Callers will
43 * generally select one or the other based on:
45 * - Whether directly dispatching a netisr handler lead to code reentrance or
46 * lock recursion, such as entering the socket code from the socket code.
47 * - Whether directly dispatching a netisr handler lead to recursive
48 * processing, such as when decapsulating several wrapped layers of tunnel
49 * information (IPSEC within IPSEC within ...).
51 * Maintaining ordering for protocol streams is a critical design concern.
52 * Enforcing ordering limits the opportunity for concurrency, but maintains
53 * the strong ordering requirements found in some protocols, such as TCP. Of
54 * related concern is CPU affinity--it is desirable to process all data
55 * associated with a particular stream on the same CPU over time in order to
56 * avoid acquiring locks associated with the connection on different CPUs,
57 * keep connection data in one cache, and to generally encourage associated
58 * user threads to live on the same CPU as the stream. It's also desirable
59 * to avoid lock migration and contention where locks are associated with
62 * netisr supports several policy variations, represented by the
63 * NETISR_POLICY_* constants, allowing protocols to play various roles in
64 * identifying flows, assigning work to CPUs, etc. These are described in
69 #include "opt_device_polling.h"
71 #include <sys/param.h>
73 #include <sys/kernel.h>
74 #include <sys/kthread.h>
75 #include <sys/malloc.h>
76 #include <sys/interrupt.h>
79 #include <sys/mutex.h>
82 #include <sys/rmlock.h>
83 #include <sys/sched.h>
85 #include <sys/socket.h>
86 #include <sys/sysctl.h>
87 #include <sys/systm.h>
93 #define _WANT_NETISR_INTERNAL /* Enable definitions from netisr_internal.h */
95 #include <net/if_var.h>
96 #include <net/netisr.h>
97 #include <net/netisr_internal.h>
101 * Synchronize use and modification of the registered netisr data structures;
102 * acquire a read lock while modifying the set of registered protocols to
103 * prevent partially registered or unregistered protocols from being run.
105 * The following data structures and fields are protected by this lock:
107 * - The netisr_proto array, including all fields of struct netisr_proto.
108 * - The nws array, including all fields of struct netisr_worker.
109 * - The nws_array array.
111 * Note: the NETISR_LOCKING define controls whether read locks are acquired
112 * in packet processing paths requiring netisr registration stability. This
113 * is disabled by default as it can lead to measurable performance
114 * degradation even with rmlocks (3%-6% for loopback ping-pong traffic), and
115 * because netisr registration and unregistration is extremely rare at
116 * runtime. If it becomes more common, this decision should be revisited.
118 * XXXRW: rmlocks don't support assertions.
120 static struct rmlock netisr_rmlock;
121 #define NETISR_LOCK_INIT() rm_init_flags(&netisr_rmlock, "netisr", \
123 #define NETISR_LOCK_ASSERT()
124 #define NETISR_RLOCK(tracker) rm_rlock(&netisr_rmlock, (tracker))
125 #define NETISR_RUNLOCK(tracker) rm_runlock(&netisr_rmlock, (tracker))
126 #define NETISR_WLOCK() rm_wlock(&netisr_rmlock)
127 #define NETISR_WUNLOCK() rm_wunlock(&netisr_rmlock)
128 /* #define NETISR_LOCKING */
130 static SYSCTL_NODE(_net, OID_AUTO, isr, CTLFLAG_RW, 0, "netisr");
133 * Three global direct dispatch policies are supported:
135 * NETISR_DISPATCH_DEFERRED: All work is deferred for a netisr, regardless of
136 * context (may be overriden by protocols).
138 * NETISR_DISPATCH_HYBRID: If the executing context allows direct dispatch,
139 * and we're running on the CPU the work would be performed on, then direct
140 * dispatch it if it wouldn't violate ordering constraints on the workstream.
142 * NETISR_DISPATCH_DIRECT: If the executing context allows direct dispatch,
143 * always direct dispatch. (The default.)
145 * Notice that changing the global policy could lead to short periods of
146 * misordered processing, but this is considered acceptable as compared to
147 * the complexity of enforcing ordering during policy changes. Protocols can
148 * override the global policy (when they're not doing that, they select
149 * NETISR_DISPATCH_DEFAULT).
151 #define NETISR_DISPATCH_POLICY_DEFAULT NETISR_DISPATCH_DIRECT
152 #define NETISR_DISPATCH_POLICY_MAXSTR 20 /* Used for temporary buffers. */
153 static u_int netisr_dispatch_policy = NETISR_DISPATCH_POLICY_DEFAULT;
154 static int sysctl_netisr_dispatch_policy(SYSCTL_HANDLER_ARGS);
155 SYSCTL_PROC(_net_isr, OID_AUTO, dispatch, CTLTYPE_STRING | CTLFLAG_RWTUN,
156 0, 0, sysctl_netisr_dispatch_policy, "A",
157 "netisr dispatch policy");
160 * Allow the administrator to limit the number of threads (CPUs) to use for
161 * netisr. We don't check netisr_maxthreads before creating the thread for
162 * CPU 0. This must be set at boot. We will create at most one thread per CPU.
163 * By default we initialize this to 1 which would assign just 1 cpu (cpu0) and
164 * therefore only 1 workstream. If set to -1, netisr would use all cpus
165 * (mp_ncpus) and therefore would have those many workstreams. One workstream
168 static int netisr_maxthreads = 1; /* Max number of threads. */
169 SYSCTL_INT(_net_isr, OID_AUTO, maxthreads, CTLFLAG_RDTUN,
170 &netisr_maxthreads, 0,
171 "Use at most this many CPUs for netisr processing");
173 static int netisr_bindthreads = 0; /* Bind threads to CPUs. */
174 SYSCTL_INT(_net_isr, OID_AUTO, bindthreads, CTLFLAG_RDTUN,
175 &netisr_bindthreads, 0, "Bind netisr threads to CPUs.");
178 * Limit per-workstream mbuf queue limits s to at most net.isr.maxqlimit,
179 * both for initial configuration and later modification using
180 * netisr_setqlimit().
182 #define NETISR_DEFAULT_MAXQLIMIT 10240
183 static u_int netisr_maxqlimit = NETISR_DEFAULT_MAXQLIMIT;
184 SYSCTL_UINT(_net_isr, OID_AUTO, maxqlimit, CTLFLAG_RDTUN,
185 &netisr_maxqlimit, 0,
186 "Maximum netisr per-protocol, per-CPU queue depth.");
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.
193 #define NETISR_DEFAULT_DEFAULTQLIMIT 256
194 static u_int netisr_defaultqlimit = NETISR_DEFAULT_DEFAULTQLIMIT;
195 SYSCTL_UINT(_net_isr, OID_AUTO, defaultqlimit, CTLFLAG_RDTUN,
196 &netisr_defaultqlimit, 0,
197 "Default netisr per-protocol, per-CPU queue limit if not set by protocol");
200 * Store and export the compile-time constant NETISR_MAXPROT limit on the
201 * number of protocols that can register with netisr at a time. This is
202 * required for crashdump analysis, as it sizes netisr_proto[].
204 static u_int netisr_maxprot = NETISR_MAXPROT;
205 SYSCTL_UINT(_net_isr, OID_AUTO, maxprot, CTLFLAG_RD,
207 "Compile-time limit on the number of protocols supported by netisr.");
210 * The netisr_proto array describes all registered protocols, indexed by
211 * protocol number. See netisr_internal.h for more details.
213 static struct netisr_proto netisr_proto[NETISR_MAXPROT];
217 * The netisr_enable array describes a per-VNET flag for registered
218 * protocols on whether this netisr is active in this VNET or not.
219 * netisr_register() will automatically enable the netisr for the
220 * default VNET and all currently active instances.
221 * netisr_unregister() will disable all active VNETs, including vnet0.
222 * Individual network stack instances can be enabled/disabled by the
223 * netisr_(un)register _vnet() functions.
224 * With this we keep the one netisr_proto per protocol but add a
225 * mechanism to stop netisr processing for vnet teardown.
226 * Apart from that we expect a VNET to always be enabled.
228 VNET_DEFINE_STATIC(u_int, netisr_enable[NETISR_MAXPROT]);
229 #define V_netisr_enable VNET(netisr_enable)
233 * Per-CPU workstream data. See netisr_internal.h for more details.
235 DPCPU_DEFINE(struct netisr_workstream, nws);
238 * Map contiguous values between 0 and nws_count into CPU IDs appropriate for
239 * accessing workstreams. This allows constructions of the form
240 * DPCPU_ID_GET(nws_array[arbitraryvalue % nws_count], nws).
242 static u_int nws_array[MAXCPU];
245 * Number of registered workstreams. Will be at most the number of running
246 * CPUs once fully started.
248 static u_int nws_count;
249 SYSCTL_UINT(_net_isr, OID_AUTO, numthreads, CTLFLAG_RD,
250 &nws_count, 0, "Number of extant netisr threads.");
253 * Synchronization for each workstream: a mutex protects all mutable fields
254 * in each stream, including per-protocol state (mbuf queues). The SWI is
255 * woken up if asynchronous dispatch is required.
257 #define NWS_LOCK(s) mtx_lock(&(s)->nws_mtx)
258 #define NWS_LOCK_ASSERT(s) mtx_assert(&(s)->nws_mtx, MA_OWNED)
259 #define NWS_UNLOCK(s) mtx_unlock(&(s)->nws_mtx)
260 #define NWS_SIGNAL(s) swi_sched((s)->nws_swi_cookie, 0)
263 * Utility routines for protocols that implement their own mapping of flows
267 netisr_get_cpucount(void)
274 netisr_get_cpuid(u_int cpunumber)
277 return (nws_array[cpunumber % nws_count]);
281 * The default implementation of flow -> CPU ID mapping.
283 * Non-static so that protocols can use it to map their own work to specific
284 * CPUs in a manner consistent to netisr for affinity purposes.
287 netisr_default_flow2cpu(u_int flowid)
290 return (nws_array[flowid % nws_count]);
294 * Dispatch tunable and sysctl configuration.
296 struct netisr_dispatch_table_entry {
298 const char *ndte_policy_str;
300 static const struct netisr_dispatch_table_entry netisr_dispatch_table[] = {
301 { NETISR_DISPATCH_DEFAULT, "default" },
302 { NETISR_DISPATCH_DEFERRED, "deferred" },
303 { NETISR_DISPATCH_HYBRID, "hybrid" },
304 { NETISR_DISPATCH_DIRECT, "direct" },
308 netisr_dispatch_policy_to_str(u_int dispatch_policy, char *buffer,
311 const struct netisr_dispatch_table_entry *ndtep;
316 for (i = 0; i < nitems(netisr_dispatch_table); i++) {
317 ndtep = &netisr_dispatch_table[i];
318 if (ndtep->ndte_policy == dispatch_policy) {
319 str = ndtep->ndte_policy_str;
323 snprintf(buffer, buflen, "%s", str);
327 netisr_dispatch_policy_from_str(const char *str, u_int *dispatch_policyp)
329 const struct netisr_dispatch_table_entry *ndtep;
332 for (i = 0; i < nitems(netisr_dispatch_table); i++) {
333 ndtep = &netisr_dispatch_table[i];
334 if (strcmp(ndtep->ndte_policy_str, str) == 0) {
335 *dispatch_policyp = ndtep->ndte_policy;
343 sysctl_netisr_dispatch_policy(SYSCTL_HANDLER_ARGS)
345 char tmp[NETISR_DISPATCH_POLICY_MAXSTR];
346 u_int dispatch_policy;
349 netisr_dispatch_policy_to_str(netisr_dispatch_policy, tmp,
351 error = sysctl_handle_string(oidp, tmp, sizeof(tmp), req);
352 if (error == 0 && req->newptr != NULL) {
353 error = netisr_dispatch_policy_from_str(tmp,
355 if (error == 0 && dispatch_policy == NETISR_DISPATCH_DEFAULT)
358 netisr_dispatch_policy = dispatch_policy;
364 * Register a new netisr handler, which requires initializing per-protocol
365 * fields for each workstream. All netisr work is briefly suspended while
366 * the protocol is installed.
369 netisr_register(const struct netisr_handler *nhp)
371 VNET_ITERATOR_DECL(vnet_iter);
372 struct netisr_work *npwp;
376 proto = nhp->nh_proto;
380 * Test that the requested registration is valid.
382 KASSERT(nhp->nh_name != NULL,
383 ("%s: nh_name NULL for %u", __func__, proto));
384 KASSERT(nhp->nh_handler != NULL,
385 ("%s: nh_handler NULL for %s", __func__, name));
386 KASSERT(nhp->nh_policy == NETISR_POLICY_SOURCE ||
387 nhp->nh_policy == NETISR_POLICY_FLOW ||
388 nhp->nh_policy == NETISR_POLICY_CPU,
389 ("%s: unsupported nh_policy %u for %s", __func__,
390 nhp->nh_policy, name));
391 KASSERT(nhp->nh_policy == NETISR_POLICY_FLOW ||
392 nhp->nh_m2flow == NULL,
393 ("%s: nh_policy != FLOW but m2flow defined for %s", __func__,
395 KASSERT(nhp->nh_policy == NETISR_POLICY_CPU || nhp->nh_m2cpuid == NULL,
396 ("%s: nh_policy != CPU but m2cpuid defined for %s", __func__,
398 KASSERT(nhp->nh_policy != NETISR_POLICY_CPU || nhp->nh_m2cpuid != NULL,
399 ("%s: nh_policy == CPU but m2cpuid not defined for %s", __func__,
401 KASSERT(nhp->nh_dispatch == NETISR_DISPATCH_DEFAULT ||
402 nhp->nh_dispatch == NETISR_DISPATCH_DEFERRED ||
403 nhp->nh_dispatch == NETISR_DISPATCH_HYBRID ||
404 nhp->nh_dispatch == NETISR_DISPATCH_DIRECT,
405 ("%s: invalid nh_dispatch (%u)", __func__, nhp->nh_dispatch));
407 KASSERT(proto < NETISR_MAXPROT,
408 ("%s(%u, %s): protocol too big", __func__, proto, name));
411 * Test that no existing registration exists for this protocol.
414 KASSERT(netisr_proto[proto].np_name == NULL,
415 ("%s(%u, %s): name present", __func__, proto, name));
416 KASSERT(netisr_proto[proto].np_handler == NULL,
417 ("%s(%u, %s): handler present", __func__, proto, name));
419 netisr_proto[proto].np_name = name;
420 netisr_proto[proto].np_handler = nhp->nh_handler;
421 netisr_proto[proto].np_m2flow = nhp->nh_m2flow;
422 netisr_proto[proto].np_m2cpuid = nhp->nh_m2cpuid;
423 netisr_proto[proto].np_drainedcpu = nhp->nh_drainedcpu;
424 if (nhp->nh_qlimit == 0)
425 netisr_proto[proto].np_qlimit = netisr_defaultqlimit;
426 else if (nhp->nh_qlimit > netisr_maxqlimit) {
427 printf("%s: %s requested queue limit %u capped to "
428 "net.isr.maxqlimit %u\n", __func__, name, nhp->nh_qlimit,
430 netisr_proto[proto].np_qlimit = netisr_maxqlimit;
432 netisr_proto[proto].np_qlimit = nhp->nh_qlimit;
433 netisr_proto[proto].np_policy = nhp->nh_policy;
434 netisr_proto[proto].np_dispatch = nhp->nh_dispatch;
436 npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto];
437 bzero(npwp, sizeof(*npwp));
438 npwp->nw_qlimit = netisr_proto[proto].np_qlimit;
443 * Test that we are in vnet0 and have a curvnet set.
445 KASSERT(curvnet != NULL, ("%s: curvnet is NULL", __func__));
446 KASSERT(IS_DEFAULT_VNET(curvnet), ("%s: curvnet %p is not vnet0 %p",
447 __func__, curvnet, vnet0));
448 VNET_LIST_RLOCK_NOSLEEP();
449 VNET_FOREACH(vnet_iter) {
450 CURVNET_SET(vnet_iter);
451 V_netisr_enable[proto] = 1;
454 VNET_LIST_RUNLOCK_NOSLEEP();
460 * Clear drop counters across all workstreams for a protocol.
463 netisr_clearqdrops(const struct netisr_handler *nhp)
465 struct netisr_work *npwp;
471 proto = nhp->nh_proto;
475 KASSERT(proto < NETISR_MAXPROT,
476 ("%s(%u): protocol too big for %s", __func__, proto, name));
479 KASSERT(netisr_proto[proto].np_handler != NULL,
480 ("%s(%u): protocol not registered for %s", __func__, proto,
484 npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto];
491 * Query current drop counters across all workstreams for a protocol.
494 netisr_getqdrops(const struct netisr_handler *nhp, u_int64_t *qdropp)
496 struct netisr_work *npwp;
497 struct rm_priotracker tracker;
504 proto = nhp->nh_proto;
508 KASSERT(proto < NETISR_MAXPROT,
509 ("%s(%u): protocol too big for %s", __func__, proto, name));
511 NETISR_RLOCK(&tracker);
512 KASSERT(netisr_proto[proto].np_handler != NULL,
513 ("%s(%u): protocol not registered for %s", __func__, proto,
517 npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto];
518 *qdropp += npwp->nw_qdrops;
520 NETISR_RUNLOCK(&tracker);
524 * Query current per-workstream queue limit for a protocol.
527 netisr_getqlimit(const struct netisr_handler *nhp, u_int *qlimitp)
529 struct rm_priotracker tracker;
535 proto = nhp->nh_proto;
539 KASSERT(proto < NETISR_MAXPROT,
540 ("%s(%u): protocol too big for %s", __func__, proto, name));
542 NETISR_RLOCK(&tracker);
543 KASSERT(netisr_proto[proto].np_handler != NULL,
544 ("%s(%u): protocol not registered for %s", __func__, proto,
546 *qlimitp = netisr_proto[proto].np_qlimit;
547 NETISR_RUNLOCK(&tracker);
551 * Update the queue limit across per-workstream queues for a protocol. We
552 * simply change the limits, and don't drain overflowed packets as they will
553 * (hopefully) take care of themselves shortly.
556 netisr_setqlimit(const struct netisr_handler *nhp, u_int qlimit)
558 struct netisr_work *npwp;
564 if (qlimit > netisr_maxqlimit)
567 proto = nhp->nh_proto;
571 KASSERT(proto < NETISR_MAXPROT,
572 ("%s(%u): protocol too big for %s", __func__, proto, name));
575 KASSERT(netisr_proto[proto].np_handler != NULL,
576 ("%s(%u): protocol not registered for %s", __func__, proto,
579 netisr_proto[proto].np_qlimit = qlimit;
581 npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto];
582 npwp->nw_qlimit = qlimit;
589 * Drain all packets currently held in a particular protocol work queue.
592 netisr_drain_proto(struct netisr_work *npwp)
597 * We would assert the lock on the workstream but it's not passed in.
599 while ((m = npwp->nw_head) != NULL) {
600 npwp->nw_head = m->m_nextpkt;
602 if (npwp->nw_head == NULL)
603 npwp->nw_tail = NULL;
607 KASSERT(npwp->nw_tail == NULL, ("%s: tail", __func__));
608 KASSERT(npwp->nw_len == 0, ("%s: len", __func__));
612 * Remove the registration of a network protocol, which requires clearing
613 * per-protocol fields across all workstreams, including freeing all mbufs in
614 * the queues at time of unregister. All work in netisr is briefly suspended
615 * while this takes place.
618 netisr_unregister(const struct netisr_handler *nhp)
620 VNET_ITERATOR_DECL(vnet_iter);
621 struct netisr_work *npwp;
627 proto = nhp->nh_proto;
631 KASSERT(proto < NETISR_MAXPROT,
632 ("%s(%u): protocol too big for %s", __func__, proto, name));
635 KASSERT(netisr_proto[proto].np_handler != NULL,
636 ("%s(%u): protocol not registered for %s", __func__, proto,
640 VNET_LIST_RLOCK_NOSLEEP();
641 VNET_FOREACH(vnet_iter) {
642 CURVNET_SET(vnet_iter);
643 V_netisr_enable[proto] = 0;
646 VNET_LIST_RUNLOCK_NOSLEEP();
649 netisr_proto[proto].np_name = NULL;
650 netisr_proto[proto].np_handler = NULL;
651 netisr_proto[proto].np_m2flow = NULL;
652 netisr_proto[proto].np_m2cpuid = NULL;
653 netisr_proto[proto].np_qlimit = 0;
654 netisr_proto[proto].np_policy = 0;
656 npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto];
657 netisr_drain_proto(npwp);
658 bzero(npwp, sizeof(*npwp));
665 netisr_register_vnet(const struct netisr_handler *nhp)
669 proto = nhp->nh_proto;
671 KASSERT(curvnet != NULL, ("%s: curvnet is NULL", __func__));
672 KASSERT(proto < NETISR_MAXPROT,
673 ("%s(%u): protocol too big for %s", __func__, proto, nhp->nh_name));
675 KASSERT(netisr_proto[proto].np_handler != NULL,
676 ("%s(%u): protocol not registered for %s", __func__, proto,
679 V_netisr_enable[proto] = 1;
684 netisr_drain_proto_vnet(struct vnet *vnet, u_int proto)
686 struct netisr_workstream *nwsp;
687 struct netisr_work *npwp;
688 struct mbuf *m, *mp, *n, *ne;
691 KASSERT(vnet != NULL, ("%s: vnet is NULL", __func__));
692 NETISR_LOCK_ASSERT();
695 nwsp = DPCPU_ID_PTR(i, nws);
696 if (nwsp->nws_intr_event == NULL)
698 npwp = &nwsp->nws_work[proto];
702 * Rather than dissecting and removing mbufs from the middle
703 * of the chain, we build a new chain if the packet stays and
704 * update the head and tail pointers at the end. All packets
705 * matching the given vnet are freed.
712 mp->m_nextpkt = NULL;
713 if (mp->m_pkthdr.rcvif->if_vnet != vnet) {
722 /* This is a packet in the selected vnet. Free it. */
733 netisr_unregister_vnet(const struct netisr_handler *nhp)
737 proto = nhp->nh_proto;
739 KASSERT(curvnet != NULL, ("%s: curvnet is NULL", __func__));
740 KASSERT(proto < NETISR_MAXPROT,
741 ("%s(%u): protocol too big for %s", __func__, proto, nhp->nh_name));
743 KASSERT(netisr_proto[proto].np_handler != NULL,
744 ("%s(%u): protocol not registered for %s", __func__, proto,
747 V_netisr_enable[proto] = 0;
749 netisr_drain_proto_vnet(curvnet, proto);
755 * Compose the global and per-protocol policies on dispatch, and return the
756 * dispatch policy to use.
759 netisr_get_dispatch(struct netisr_proto *npp)
763 * Protocol-specific configuration overrides the global default.
765 if (npp->np_dispatch != NETISR_DISPATCH_DEFAULT)
766 return (npp->np_dispatch);
767 return (netisr_dispatch_policy);
771 * Look up the workstream given a packet and source identifier. Do this by
772 * checking the protocol's policy, and optionally call out to the protocol
773 * for assistance if required.
776 netisr_select_cpuid(struct netisr_proto *npp, u_int dispatch_policy,
777 uintptr_t source, struct mbuf *m, u_int *cpuidp)
782 NETISR_LOCK_ASSERT();
785 * In the event we have only one worker, shortcut and deliver to it
786 * without further ado.
788 if (nws_count == 1) {
789 *cpuidp = nws_array[0];
794 * What happens next depends on the policy selected by the protocol.
795 * If we want to support per-interface policies, we should do that
798 policy = npp->np_policy;
799 if (policy == NETISR_POLICY_CPU) {
800 m = npp->np_m2cpuid(m, source, cpuidp);
805 * It's possible for a protocol not to have a good idea about
806 * where to process a packet, in which case we fall back on
807 * the netisr code to decide. In the hybrid case, return the
808 * current CPU ID, which will force an immediate direct
809 * dispatch. In the queued case, fall back on the SOURCE
812 if (*cpuidp != NETISR_CPUID_NONE) {
813 *cpuidp = netisr_get_cpuid(*cpuidp);
816 if (dispatch_policy == NETISR_DISPATCH_HYBRID) {
817 *cpuidp = netisr_get_cpuid(curcpu);
820 policy = NETISR_POLICY_SOURCE;
823 if (policy == NETISR_POLICY_FLOW) {
824 if (M_HASHTYPE_GET(m) == M_HASHTYPE_NONE &&
825 npp->np_m2flow != NULL) {
826 m = npp->np_m2flow(m, source);
830 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
832 netisr_default_flow2cpu(m->m_pkthdr.flowid);
835 policy = NETISR_POLICY_SOURCE;
838 KASSERT(policy == NETISR_POLICY_SOURCE,
839 ("%s: invalid policy %u for %s", __func__, npp->np_policy,
842 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
843 ifp = m->m_pkthdr.rcvif;
845 *cpuidp = nws_array[(ifp->if_index + source) % nws_count];
847 *cpuidp = nws_array[source % nws_count];
852 * Process packets associated with a workstream and protocol. For reasons of
853 * fairness, we process up to one complete netisr queue at a time, moving the
854 * queue to a stack-local queue for processing, but do not loop refreshing
855 * from the global queue. The caller is responsible for deciding whether to
856 * loop, and for setting the NWS_RUNNING flag. The passed workstream will be
857 * locked on entry and relocked before return, but will be released while
858 * processing. The number of packets processed is returned.
861 netisr_process_workstream_proto(struct netisr_workstream *nwsp, u_int proto)
863 struct netisr_work local_npw, *npwp;
867 NETISR_LOCK_ASSERT();
868 NWS_LOCK_ASSERT(nwsp);
870 KASSERT(nwsp->nws_flags & NWS_RUNNING,
871 ("%s(%u): not running", __func__, proto));
872 KASSERT(proto >= 0 && proto < NETISR_MAXPROT,
873 ("%s(%u): invalid proto\n", __func__, proto));
875 npwp = &nwsp->nws_work[proto];
876 if (npwp->nw_len == 0)
880 * Move the global work queue to a thread-local work queue.
882 * Notice that this means the effective maximum length of the queue
883 * is actually twice that of the maximum queue length specified in
884 * the protocol registration call.
886 handled = npwp->nw_len;
888 npwp->nw_head = NULL;
889 npwp->nw_tail = NULL;
891 nwsp->nws_pendingbits &= ~(1 << proto);
893 while ((m = local_npw.nw_head) != NULL) {
894 local_npw.nw_head = m->m_nextpkt;
896 if (local_npw.nw_head == NULL)
897 local_npw.nw_tail = NULL;
899 VNET_ASSERT(m->m_pkthdr.rcvif != NULL,
900 ("%s:%d rcvif == NULL: m=%p", __func__, __LINE__, m));
901 CURVNET_SET(m->m_pkthdr.rcvif->if_vnet);
902 netisr_proto[proto].np_handler(m);
905 KASSERT(local_npw.nw_len == 0,
906 ("%s(%u): len %u", __func__, proto, local_npw.nw_len));
907 if (netisr_proto[proto].np_drainedcpu)
908 netisr_proto[proto].np_drainedcpu(nwsp->nws_cpu);
910 npwp->nw_handled += handled;
915 * SWI handler for netisr -- processes packets in a set of workstreams that
916 * it owns, woken up by calls to NWS_SIGNAL(). If this workstream is already
917 * being direct dispatched, go back to sleep and wait for the dispatching
918 * thread to wake us up again.
923 #ifdef NETISR_LOCKING
924 struct rm_priotracker tracker;
926 struct netisr_workstream *nwsp;
931 #ifdef DEVICE_POLLING
932 KASSERT(nws_count == 1,
933 ("%s: device_polling but nws_count != 1", __func__));
936 #ifdef NETISR_LOCKING
937 NETISR_RLOCK(&tracker);
940 KASSERT(!(nwsp->nws_flags & NWS_RUNNING), ("swi_net: running"));
941 if (nwsp->nws_flags & NWS_DISPATCHING)
943 nwsp->nws_flags |= NWS_RUNNING;
944 nwsp->nws_flags &= ~NWS_SCHEDULED;
945 while ((bits = nwsp->nws_pendingbits) != 0) {
946 while ((prot = ffs(bits)) != 0) {
948 bits &= ~(1 << prot);
949 (void)netisr_process_workstream_proto(nwsp, prot);
952 nwsp->nws_flags &= ~NWS_RUNNING;
955 #ifdef NETISR_LOCKING
956 NETISR_RUNLOCK(&tracker);
958 #ifdef DEVICE_POLLING
964 netisr_queue_workstream(struct netisr_workstream *nwsp, u_int proto,
965 struct netisr_work *npwp, struct mbuf *m, int *dosignalp)
968 NWS_LOCK_ASSERT(nwsp);
971 if (npwp->nw_len < npwp->nw_qlimit) {
973 if (npwp->nw_head == NULL) {
977 npwp->nw_tail->m_nextpkt = m;
981 if (npwp->nw_len > npwp->nw_watermark)
982 npwp->nw_watermark = npwp->nw_len;
985 * We must set the bit regardless of NWS_RUNNING, so that
986 * swi_net() keeps calling netisr_process_workstream_proto().
988 nwsp->nws_pendingbits |= (1 << proto);
989 if (!(nwsp->nws_flags &
990 (NWS_RUNNING | NWS_DISPATCHING | NWS_SCHEDULED))) {
991 nwsp->nws_flags |= NWS_SCHEDULED;
992 *dosignalp = 1; /* Defer until unlocked. */
1004 netisr_queue_internal(u_int proto, struct mbuf *m, u_int cpuid)
1006 struct netisr_workstream *nwsp;
1007 struct netisr_work *npwp;
1008 int dosignal, error;
1010 #ifdef NETISR_LOCKING
1011 NETISR_LOCK_ASSERT();
1013 KASSERT(cpuid <= mp_maxid, ("%s: cpuid too big (%u, %u)", __func__,
1015 KASSERT(!CPU_ABSENT(cpuid), ("%s: CPU %u absent", __func__, cpuid));
1019 nwsp = DPCPU_ID_PTR(cpuid, nws);
1020 npwp = &nwsp->nws_work[proto];
1022 error = netisr_queue_workstream(nwsp, proto, npwp, m, &dosignal);
1030 netisr_queue_src(u_int proto, uintptr_t source, struct mbuf *m)
1032 #ifdef NETISR_LOCKING
1033 struct rm_priotracker tracker;
1038 KASSERT(proto < NETISR_MAXPROT,
1039 ("%s: invalid proto %u", __func__, proto));
1041 #ifdef NETISR_LOCKING
1042 NETISR_RLOCK(&tracker);
1044 KASSERT(netisr_proto[proto].np_handler != NULL,
1045 ("%s: invalid proto %u", __func__, proto));
1048 if (V_netisr_enable[proto] == 0) {
1050 return (ENOPROTOOPT);
1054 m = netisr_select_cpuid(&netisr_proto[proto], NETISR_DISPATCH_DEFERRED,
1057 KASSERT(!CPU_ABSENT(cpuid), ("%s: CPU %u absent", __func__,
1059 error = netisr_queue_internal(proto, m, cpuid);
1062 #ifdef NETISR_LOCKING
1063 NETISR_RUNLOCK(&tracker);
1069 netisr_queue(u_int proto, struct mbuf *m)
1072 return (netisr_queue_src(proto, 0, m));
1076 * Dispatch a packet for netisr processing; direct dispatch is permitted by
1080 netisr_dispatch_src(u_int proto, uintptr_t source, struct mbuf *m)
1082 #ifdef NETISR_LOCKING
1083 struct rm_priotracker tracker;
1085 struct netisr_workstream *nwsp;
1086 struct netisr_proto *npp;
1087 struct netisr_work *npwp;
1088 int dosignal, error;
1089 u_int cpuid, dispatch_policy;
1091 KASSERT(proto < NETISR_MAXPROT,
1092 ("%s: invalid proto %u", __func__, proto));
1093 #ifdef NETISR_LOCKING
1094 NETISR_RLOCK(&tracker);
1096 npp = &netisr_proto[proto];
1097 KASSERT(npp->np_handler != NULL, ("%s: invalid proto %u", __func__,
1101 if (V_netisr_enable[proto] == 0) {
1103 return (ENOPROTOOPT);
1107 dispatch_policy = netisr_get_dispatch(npp);
1108 if (dispatch_policy == NETISR_DISPATCH_DEFERRED)
1109 return (netisr_queue_src(proto, source, m));
1112 * If direct dispatch is forced, then unconditionally dispatch
1113 * without a formal CPU selection. Borrow the current CPU's stats,
1114 * even if there's no worker on it. In this case we don't update
1115 * nws_flags because all netisr processing will be source ordered due
1116 * to always being forced to directly dispatch.
1118 if (dispatch_policy == NETISR_DISPATCH_DIRECT) {
1119 nwsp = DPCPU_PTR(nws);
1120 npwp = &nwsp->nws_work[proto];
1121 npwp->nw_dispatched++;
1123 netisr_proto[proto].np_handler(m);
1128 KASSERT(dispatch_policy == NETISR_DISPATCH_HYBRID,
1129 ("%s: unknown dispatch policy (%u)", __func__, dispatch_policy));
1132 * Otherwise, we execute in a hybrid mode where we will try to direct
1133 * dispatch if we're on the right CPU and the netisr worker isn't
1137 m = netisr_select_cpuid(&netisr_proto[proto], NETISR_DISPATCH_HYBRID,
1143 KASSERT(!CPU_ABSENT(cpuid), ("%s: CPU %u absent", __func__, cpuid));
1144 if (cpuid != curcpu)
1145 goto queue_fallback;
1146 nwsp = DPCPU_PTR(nws);
1147 npwp = &nwsp->nws_work[proto];
1150 * We are willing to direct dispatch only if three conditions hold:
1152 * (1) The netisr worker isn't already running,
1153 * (2) Another thread isn't already directly dispatching, and
1154 * (3) The netisr hasn't already been woken up.
1157 if (nwsp->nws_flags & (NWS_RUNNING | NWS_DISPATCHING | NWS_SCHEDULED)) {
1158 error = netisr_queue_workstream(nwsp, proto, npwp, m,
1167 * The current thread is now effectively the netisr worker, so set
1168 * the dispatching flag to prevent concurrent processing of the
1169 * stream from another thread (even the netisr worker), which could
1170 * otherwise lead to effective misordering of the stream.
1172 nwsp->nws_flags |= NWS_DISPATCHING;
1174 netisr_proto[proto].np_handler(m);
1176 nwsp->nws_flags &= ~NWS_DISPATCHING;
1178 npwp->nw_hybrid_dispatched++;
1181 * If other work was enqueued by another thread while we were direct
1182 * dispatching, we need to signal the netisr worker to do that work.
1183 * In the future, we might want to do some of that work in the
1184 * current thread, rather than trigger further context switches. If
1185 * so, we'll want to establish a reasonable bound on the work done in
1186 * the "borrowed" context.
1188 if (nwsp->nws_pendingbits != 0) {
1189 nwsp->nws_flags |= NWS_SCHEDULED;
1200 error = netisr_queue_internal(proto, m, cpuid);
1204 #ifdef NETISR_LOCKING
1205 NETISR_RUNLOCK(&tracker);
1211 netisr_dispatch(u_int proto, struct mbuf *m)
1214 return (netisr_dispatch_src(proto, 0, m));
1217 #ifdef DEVICE_POLLING
1219 * Kernel polling borrows a netisr thread to run interface polling in; this
1220 * function allows kernel polling to request that the netisr thread be
1221 * scheduled even if no packets are pending for protocols.
1224 netisr_sched_poll(void)
1226 struct netisr_workstream *nwsp;
1228 nwsp = DPCPU_ID_PTR(nws_array[0], nws);
1234 netisr_start_swi(u_int cpuid, struct pcpu *pc)
1237 struct netisr_workstream *nwsp;
1240 KASSERT(!CPU_ABSENT(cpuid), ("%s: CPU %u absent", __func__, cpuid));
1242 nwsp = DPCPU_ID_PTR(cpuid, nws);
1243 mtx_init(&nwsp->nws_mtx, "netisr_mtx", NULL, MTX_DEF);
1244 nwsp->nws_cpu = cpuid;
1245 snprintf(swiname, sizeof(swiname), "netisr %u", cpuid);
1246 error = swi_add(&nwsp->nws_intr_event, swiname, swi_net, nwsp,
1247 SWI_NET, INTR_MPSAFE, &nwsp->nws_swi_cookie);
1249 panic("%s: swi_add %d", __func__, error);
1250 pc->pc_netisr = nwsp->nws_intr_event;
1251 if (netisr_bindthreads) {
1252 error = intr_event_bind(nwsp->nws_intr_event, cpuid);
1254 printf("%s: cpu %u: intr_event_bind: %d", __func__,
1258 nws_array[nws_count] = nwsp->nws_cpu;
1264 * Initialize the netisr subsystem. We rely on BSS and static initialization
1265 * of most fields in global data structures.
1267 * Start a worker thread for the boot CPU so that we can support network
1268 * traffic immediately in case the network stack is used before additional
1269 * CPUs are started (for example, diskless boot).
1272 netisr_init(void *arg)
1277 if (netisr_maxthreads == 0 || netisr_maxthreads < -1 )
1278 netisr_maxthreads = 1; /* default behavior */
1279 else if (netisr_maxthreads == -1)
1280 netisr_maxthreads = mp_ncpus; /* use max cpus */
1281 if (netisr_maxthreads > mp_ncpus) {
1282 printf("netisr_init: forcing maxthreads from %d to %d\n",
1283 netisr_maxthreads, mp_ncpus);
1284 netisr_maxthreads = mp_ncpus;
1286 if (netisr_defaultqlimit > netisr_maxqlimit) {
1287 printf("netisr_init: forcing defaultqlimit from %d to %d\n",
1288 netisr_defaultqlimit, netisr_maxqlimit);
1289 netisr_defaultqlimit = netisr_maxqlimit;
1291 #ifdef DEVICE_POLLING
1293 * The device polling code is not yet aware of how to deal with
1294 * multiple netisr threads, so for the time being compiling in device
1295 * polling disables parallel netisr workers.
1297 if (netisr_maxthreads != 1 || netisr_bindthreads != 0) {
1298 printf("netisr_init: forcing maxthreads to 1 and "
1299 "bindthreads to 0 for device polling\n");
1300 netisr_maxthreads = 1;
1301 netisr_bindthreads = 0;
1305 #ifdef EARLY_AP_STARTUP
1306 STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
1307 if (nws_count >= netisr_maxthreads)
1309 netisr_start_swi(pc->pc_cpuid, pc);
1313 netisr_start_swi(pc->pc_cpuid, pc);
1316 SYSINIT(netisr_init, SI_SUB_SOFTINTR, SI_ORDER_FIRST, netisr_init, NULL);
1318 #ifndef EARLY_AP_STARTUP
1320 * Start worker threads for additional CPUs. No attempt to gracefully handle
1321 * work reassignment, we don't yet support dynamic reconfiguration.
1324 netisr_start(void *arg)
1328 STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
1329 if (nws_count >= netisr_maxthreads)
1331 /* Worker will already be present for boot CPU. */
1332 if (pc->pc_netisr != NULL)
1334 netisr_start_swi(pc->pc_cpuid, pc);
1337 SYSINIT(netisr_start, SI_SUB_SMP, SI_ORDER_MIDDLE, netisr_start, NULL);
1341 * Sysctl monitoring for netisr: query a list of registered protocols.
1344 sysctl_netisr_proto(SYSCTL_HANDLER_ARGS)
1346 struct rm_priotracker tracker;
1347 struct sysctl_netisr_proto *snpp, *snp_array;
1348 struct netisr_proto *npp;
1349 u_int counter, proto;
1352 if (req->newptr != NULL)
1354 snp_array = malloc(sizeof(*snp_array) * NETISR_MAXPROT, M_TEMP,
1357 NETISR_RLOCK(&tracker);
1358 for (proto = 0; proto < NETISR_MAXPROT; proto++) {
1359 npp = &netisr_proto[proto];
1360 if (npp->np_name == NULL)
1362 snpp = &snp_array[counter];
1363 snpp->snp_version = sizeof(*snpp);
1364 strlcpy(snpp->snp_name, npp->np_name, NETISR_NAMEMAXLEN);
1365 snpp->snp_proto = proto;
1366 snpp->snp_qlimit = npp->np_qlimit;
1367 snpp->snp_policy = npp->np_policy;
1368 snpp->snp_dispatch = npp->np_dispatch;
1369 if (npp->np_m2flow != NULL)
1370 snpp->snp_flags |= NETISR_SNP_FLAGS_M2FLOW;
1371 if (npp->np_m2cpuid != NULL)
1372 snpp->snp_flags |= NETISR_SNP_FLAGS_M2CPUID;
1373 if (npp->np_drainedcpu != NULL)
1374 snpp->snp_flags |= NETISR_SNP_FLAGS_DRAINEDCPU;
1377 NETISR_RUNLOCK(&tracker);
1378 KASSERT(counter <= NETISR_MAXPROT,
1379 ("sysctl_netisr_proto: counter too big (%d)", counter));
1380 error = SYSCTL_OUT(req, snp_array, sizeof(*snp_array) * counter);
1381 free(snp_array, M_TEMP);
1385 SYSCTL_PROC(_net_isr, OID_AUTO, proto,
1386 CTLFLAG_RD|CTLTYPE_STRUCT|CTLFLAG_MPSAFE, 0, 0, sysctl_netisr_proto,
1387 "S,sysctl_netisr_proto",
1388 "Return list of protocols registered with netisr");
1391 * Sysctl monitoring for netisr: query a list of workstreams.
1394 sysctl_netisr_workstream(SYSCTL_HANDLER_ARGS)
1396 struct rm_priotracker tracker;
1397 struct sysctl_netisr_workstream *snwsp, *snws_array;
1398 struct netisr_workstream *nwsp;
1399 u_int counter, cpuid;
1402 if (req->newptr != NULL)
1404 snws_array = malloc(sizeof(*snws_array) * MAXCPU, M_TEMP,
1407 NETISR_RLOCK(&tracker);
1408 CPU_FOREACH(cpuid) {
1409 nwsp = DPCPU_ID_PTR(cpuid, nws);
1410 if (nwsp->nws_intr_event == NULL)
1413 snwsp = &snws_array[counter];
1414 snwsp->snws_version = sizeof(*snwsp);
1417 * For now, we equate workstream IDs and CPU IDs in the
1418 * kernel, but expose them independently to userspace in case
1419 * that assumption changes in the future.
1421 snwsp->snws_wsid = cpuid;
1422 snwsp->snws_cpu = cpuid;
1423 if (nwsp->nws_intr_event != NULL)
1424 snwsp->snws_flags |= NETISR_SNWS_FLAGS_INTR;
1428 NETISR_RUNLOCK(&tracker);
1429 KASSERT(counter <= MAXCPU,
1430 ("sysctl_netisr_workstream: counter too big (%d)", counter));
1431 error = SYSCTL_OUT(req, snws_array, sizeof(*snws_array) * counter);
1432 free(snws_array, M_TEMP);
1436 SYSCTL_PROC(_net_isr, OID_AUTO, workstream,
1437 CTLFLAG_RD|CTLTYPE_STRUCT|CTLFLAG_MPSAFE, 0, 0, sysctl_netisr_workstream,
1438 "S,sysctl_netisr_workstream",
1439 "Return list of workstreams implemented by netisr");
1442 * Sysctl monitoring for netisr: query per-protocol data across all
1446 sysctl_netisr_work(SYSCTL_HANDLER_ARGS)
1448 struct rm_priotracker tracker;
1449 struct sysctl_netisr_work *snwp, *snw_array;
1450 struct netisr_workstream *nwsp;
1451 struct netisr_proto *npp;
1452 struct netisr_work *nwp;
1453 u_int counter, cpuid, proto;
1456 if (req->newptr != NULL)
1458 snw_array = malloc(sizeof(*snw_array) * MAXCPU * NETISR_MAXPROT,
1459 M_TEMP, M_ZERO | M_WAITOK);
1461 NETISR_RLOCK(&tracker);
1462 CPU_FOREACH(cpuid) {
1463 nwsp = DPCPU_ID_PTR(cpuid, nws);
1464 if (nwsp->nws_intr_event == NULL)
1467 for (proto = 0; proto < NETISR_MAXPROT; proto++) {
1468 npp = &netisr_proto[proto];
1469 if (npp->np_name == NULL)
1471 nwp = &nwsp->nws_work[proto];
1472 snwp = &snw_array[counter];
1473 snwp->snw_version = sizeof(*snwp);
1474 snwp->snw_wsid = cpuid; /* See comment above. */
1475 snwp->snw_proto = proto;
1476 snwp->snw_len = nwp->nw_len;
1477 snwp->snw_watermark = nwp->nw_watermark;
1478 snwp->snw_dispatched = nwp->nw_dispatched;
1479 snwp->snw_hybrid_dispatched =
1480 nwp->nw_hybrid_dispatched;
1481 snwp->snw_qdrops = nwp->nw_qdrops;
1482 snwp->snw_queued = nwp->nw_queued;
1483 snwp->snw_handled = nwp->nw_handled;
1488 KASSERT(counter <= MAXCPU * NETISR_MAXPROT,
1489 ("sysctl_netisr_work: counter too big (%d)", counter));
1490 NETISR_RUNLOCK(&tracker);
1491 error = SYSCTL_OUT(req, snw_array, sizeof(*snw_array) * counter);
1492 free(snw_array, M_TEMP);
1496 SYSCTL_PROC(_net_isr, OID_AUTO, work,
1497 CTLFLAG_RD|CTLTYPE_STRUCT|CTLFLAG_MPSAFE, 0, 0, sysctl_netisr_work,
1498 "S,sysctl_netisr_work",
1499 "Return list of per-workstream, per-protocol work in netisr");
1502 DB_SHOW_COMMAND(netisr, db_show_netisr)
1504 struct netisr_workstream *nwsp;
1505 struct netisr_work *nwp;
1509 db_printf("%3s %6s %5s %5s %5s %8s %8s %8s %8s\n", "CPU", "Proto",
1510 "Len", "WMark", "Max", "Disp", "HDisp", "Drop", "Queue");
1511 CPU_FOREACH(cpuid) {
1512 nwsp = DPCPU_ID_PTR(cpuid, nws);
1513 if (nwsp->nws_intr_event == NULL)
1516 for (proto = 0; proto < NETISR_MAXPROT; proto++) {
1517 if (netisr_proto[proto].np_handler == NULL)
1519 nwp = &nwsp->nws_work[proto];
1521 db_printf("%3d ", cpuid);
1524 db_printf("%3s ", "");
1526 "%6s %5d %5d %5d %8ju %8ju %8ju %8ju\n",
1527 netisr_proto[proto].np_name, nwp->nw_len,
1528 nwp->nw_watermark, nwp->nw_qlimit,
1529 nwp->nw_dispatched, nwp->nw_hybrid_dispatched,
1530 nwp->nw_qdrops, nwp->nw_queued);