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.
7 * This code is derived from software contributed to The DragonFly Project
8 * by Jonathan Lemon, Jeffrey M. Hsu, and Matthew Dillon.
10 * Jonathan Lemon gave Jeffrey Hsu permission to combine his copyright
11 * into this one around July 8 2004.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
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.
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
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>
45 #include <sys/interrupt.h>
46 #include <sys/socket.h>
47 #include <sys/sysctl.h>
48 #include <sys/socketvar.h>
50 #include <net/if_var.h>
51 #include <net/netisr.h>
52 #include <machine/cpufunc.h>
54 #include <sys/thread2.h>
55 #include <sys/msgport2.h>
56 #include <net/netmsg2.h>
57 #include <sys/mplock2.h>
59 static void netmsg_sync_func(netmsg_t msg);
60 static void netmsg_service_loop(void *arg);
61 static void cpu0_cpufn(struct mbuf **mp, int hoff);
63 struct netmsg_port_registration {
64 TAILQ_ENTRY(netmsg_port_registration) npr_entry;
68 struct netmsg_rollup {
69 TAILQ_ENTRY(netmsg_rollup) ru_entry;
73 static struct netisr netisrs[NETISR_MAX];
74 static TAILQ_HEAD(,netmsg_port_registration) netreglist;
75 static TAILQ_HEAD(,netmsg_rollup) netrulist;
77 /* Per-CPU thread to handle any protocol. */
78 static struct thread netisr_cpu[MAXCPU];
79 lwkt_port netisr_afree_rport;
80 lwkt_port netisr_afree_free_so_rport;
81 lwkt_port netisr_adone_rport;
82 lwkt_port netisr_apanic_rport;
83 lwkt_port netisr_sync_port;
85 static int (*netmsg_fwd_port_fn)(lwkt_port_t, lwkt_msg_t);
87 SYSCTL_NODE(_net, OID_AUTO, netisr, CTLFLAG_RW, 0, "netisr");
90 * netisr_afree_rport replymsg function, only used to handle async
91 * messages which the sender has abandoned to their fate.
94 netisr_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
96 kfree(msg, M_LWKTMSG);
100 netisr_autofree_free_so_reply(lwkt_port_t port, lwkt_msg_t msg)
102 sofree(((netmsg_t)msg)->base.nm_so);
103 kfree(msg, M_LWKTMSG);
107 * We need a custom putport function to handle the case where the
108 * message target is the current thread's message port. This case
109 * can occur when the TCP or UDP stack does a direct callback to NFS and NFS
110 * then turns around and executes a network operation synchronously.
112 * To prevent deadlocking, we must execute these self-referential messages
113 * synchronously, effectively turning the message into a glorified direct
114 * procedure call back into the protocol stack. The operation must be
115 * complete on return or we will deadlock, so panic if it isn't.
117 * However, the target function is under no obligation to immediately
118 * reply the message. It may forward it elsewhere.
121 netmsg_put_port(lwkt_port_t port, lwkt_msg_t lmsg)
123 netmsg_base_t nmsg = (void *)lmsg;
125 if ((lmsg->ms_flags & MSGF_SYNC) && port == &curthread->td_msgport) {
126 nmsg->nm_dispatch((netmsg_t)nmsg);
129 return(netmsg_fwd_port_fn(port, lmsg));
134 * UNIX DOMAIN sockets still have to run their uipc functions synchronously,
135 * because they depend on the user proc context for a number of things
136 * (like creds) which we have not yet incorporated into the message structure.
138 * However, we maintain or message/port abstraction. Having a special
139 * synchronous port which runs the commands synchronously gives us the
140 * ability to serialize operations in one place later on when we start
144 netmsg_sync_putport(lwkt_port_t port, lwkt_msg_t lmsg)
146 netmsg_base_t nmsg = (void *)lmsg;
148 KKASSERT((lmsg->ms_flags & MSGF_DONE) == 0);
150 lmsg->ms_target_port = port; /* required for abort */
151 nmsg->nm_dispatch((netmsg_t)nmsg);
160 TAILQ_INIT(&netreglist);
161 TAILQ_INIT(&netrulist);
164 * Create default per-cpu threads for generic protocol handling.
166 for (i = 0; i < ncpus; ++i) {
167 lwkt_create(netmsg_service_loop, NULL, NULL,
168 &netisr_cpu[i], TDF_STOPREQ, i,
170 netmsg_service_port_init(&netisr_cpu[i].td_msgport);
171 lwkt_schedule(&netisr_cpu[i]);
175 * The netisr_afree_rport is a special reply port which automatically
176 * frees the replied message. The netisr_adone_rport simply marks
177 * the message as being done. The netisr_apanic_rport panics if
178 * the message is replied to.
180 lwkt_initport_replyonly(&netisr_afree_rport, netisr_autofree_reply);
181 lwkt_initport_replyonly(&netisr_afree_free_so_rport,
182 netisr_autofree_free_so_reply);
183 lwkt_initport_replyonly_null(&netisr_adone_rport);
184 lwkt_initport_panic(&netisr_apanic_rport);
187 * The netisr_syncport is a special port which executes the message
188 * synchronously and waits for it if EASYNC is returned.
190 lwkt_initport_putonly(&netisr_sync_port, netmsg_sync_putport);
193 SYSINIT(netisr, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, netisr_init, NULL);
196 * Finish initializing the message port for a netmsg service. This also
197 * registers the port for synchronous cleanup operations such as when an
198 * ifnet is being destroyed. There is no deregistration API yet.
201 netmsg_service_port_init(lwkt_port_t port)
203 struct netmsg_port_registration *reg;
206 * Override the putport function. Our custom function checks for
207 * self-references and executes such commands synchronously.
209 if (netmsg_fwd_port_fn == NULL)
210 netmsg_fwd_port_fn = port->mp_putport;
211 KKASSERT(netmsg_fwd_port_fn == port->mp_putport);
212 port->mp_putport = netmsg_put_port;
215 * Keep track of ports using the netmsg API so we can synchronize
216 * certain operations (such as freeing an ifnet structure) across all
219 reg = kmalloc(sizeof(*reg), M_TEMP, M_WAITOK|M_ZERO);
220 reg->npr_port = port;
221 TAILQ_INSERT_TAIL(&netreglist, reg, npr_entry);
225 * This function synchronizes the caller with all netmsg services. For
226 * example, if an interface is being removed we must make sure that all
227 * packets related to that interface complete processing before the structure
228 * can actually be freed. This sort of synchronization is an alternative to
229 * ref-counting the netif, removing the ref counting overhead in favor of
230 * placing additional overhead in the netif freeing sequence (where it is
234 netmsg_service_sync(void)
236 struct netmsg_port_registration *reg;
237 struct netmsg_base smsg;
239 netmsg_init(&smsg, NULL, &curthread->td_msgport, 0, netmsg_sync_func);
241 TAILQ_FOREACH(reg, &netreglist, npr_entry) {
242 lwkt_domsg(reg->npr_port, &smsg.lmsg, 0);
247 * The netmsg function simply replies the message. API semantics require
248 * EASYNC to be returned if the netmsg function disposes of the message.
251 netmsg_sync_func(netmsg_t msg)
253 lwkt_replymsg(&msg->lmsg, 0);
257 * Generic netmsg service loop. Some protocols may roll their own but all
258 * must do the basic command dispatch function call done here.
261 netmsg_service_loop(void *arg)
263 struct netmsg_rollup *ru;
265 thread_t td = curthread;;
268 while ((msg = lwkt_waitport(&td->td_msgport, 0))) {
270 * Run up to 512 pending netmsgs.
274 KASSERT(msg->nm_dispatch != NULL,
275 ("netmsg_service isr %d badmsg\n",
276 msg->lmsg.u.ms_result));
278 msg->nm_so->so_port != &td->td_msgport) {
280 * Sockets undergoing connect or disconnect
281 * ops can change ports on us. Chase the
284 kprintf("netmsg_service_loop: Warning, "
285 "port changed so=%p\n", msg->nm_so);
286 lwkt_forwardmsg(msg->nm_so->so_port,
290 * We are on the correct port, dispatch it.
292 msg->nm_dispatch((netmsg_t)msg);
296 } while ((msg = lwkt_getport(&td->td_msgport)) != NULL);
299 * Run all registered rollup functions for this cpu
300 * (e.g. tcp_willblock()).
302 TAILQ_FOREACH(ru, &netrulist, ru_entry)
308 * Forward a packet to a netisr service function.
310 * If the packet has not been assigned to a protocol thread we call
311 * the port characterization function to assign it. The caller must
312 * clear M_HASH (or not have set it in the first place) if the caller
313 * wishes the packet to be recharacterized.
316 netisr_queue(int num, struct mbuf *m)
319 struct netmsg_packet *pmsg;
322 KASSERT((num > 0 && num <= NELEM(netisrs)),
323 ("Bad isr %d", num));
326 if (ni->ni_handler == NULL) {
327 kprintf("Unregistered isr %d\n", num);
333 * Figure out which protocol thread to send to. This does not
334 * have to be perfect but performance will be really good if it
335 * is correct. Major protocol inputs such as ip_input() will
336 * re-characterize the packet as necessary.
338 if ((m->m_flags & M_HASH) == 0) {
344 if ((m->m_flags & M_HASH) == 0) {
345 kprintf("netisr_queue(%d): packet hash failed\n", num);
352 * Get the protocol port based on the packet hash, initialize
353 * the netmsg, and send it off.
355 port = cpu_portfn(m->m_pkthdr.hash);
356 pmsg = &m->m_hdr.mh_netmsg;
357 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport,
360 pmsg->base.lmsg.u.ms_result = num;
361 lwkt_sendmsg(port, &pmsg->base.lmsg);
367 * Pre-characterization of a deeper portion of the packet for the
370 * The base of the ISR type (e.g. IP) that we want to characterize is
371 * at (hoff) relative to the beginning of the mbuf. This allows
372 * e.g. ether_input_chain() to not have to adjust the m_data/m_len.
375 netisr_characterize(int num, struct mbuf **mp, int hoff)
386 if (num < 0 || num >= NETISR_MAX) {
387 if (num == NETISR_MAX) {
388 m->m_flags |= M_HASH;
389 m->m_pkthdr.hash = 0;
392 panic("Bad isr %d", num);
399 if (ni->ni_handler == NULL) {
400 kprintf("Unregistered isr %d\n", num);
406 * Characterize the packet
408 if ((m->m_flags & M_HASH) == 0) {
409 ni->ni_cpufn(mp, hoff);
411 if (m && (m->m_flags & M_HASH) == 0)
412 kprintf("netisr_queue(%d): packet hash failed\n", num);
417 netisr_register(int num, netisr_fn_t handler, netisr_cpufn_t cpufn)
421 KASSERT((num > 0 && num <= NELEM(netisrs)),
422 ("netisr_register: bad isr %d", num));
423 KKASSERT(handler != NULL);
430 ni->ni_handler = handler;
431 ni->ni_cpufn = cpufn;
432 netmsg_init(&ni->ni_netmsg, NULL, &netisr_adone_rport, 0, NULL);
436 netisr_register_rollup(netisr_ru_t ru_func)
438 struct netmsg_rollup *ru;
440 ru = kmalloc(sizeof(*ru), M_TEMP, M_WAITOK|M_ZERO);
441 ru->ru_func = ru_func;
442 TAILQ_INSERT_TAIL(&netrulist, ru, ru_entry);
446 * Return the message port for the general protocol message servicing
447 * thread for a particular cpu.
452 KKASSERT(cpu >= 0 && cpu < ncpus);
453 return (&netisr_cpu[cpu].td_msgport);
457 * Return the current cpu's network protocol thread.
462 return(cpu_portfn(mycpu->gd_cpuid));
466 * Return a default protocol control message processing thread port
469 cpu0_ctlport(int cmd __unused, struct sockaddr *sa __unused,
470 void *extra __unused)
472 return (&netisr_cpu[0].td_msgport);
476 * This is a default netisr packet characterization function which
477 * sets M_HASH. If a netisr is registered with a NULL cpufn function
478 * this one is assigned.
480 * This function makes no attempt to validate the packet.
483 cpu0_cpufn(struct mbuf **mp, int hoff __unused)
485 struct mbuf *m = *mp;
487 m->m_flags |= M_HASH;
488 m->m_pkthdr.hash = 0;
492 * schednetisr() is used to call the netisr handler from the appropriate
493 * netisr thread for polling and other purposes.
495 * This function may be called from a hard interrupt or IPI and must be
496 * MP SAFE and non-blocking. We use a fixed per-cpu message instead of
497 * trying to allocate one. We must get ourselves onto the target cpu
498 * to safely check the MSGF_DONE bit on the message but since the message
499 * will be sent to that cpu anyway this does not add any extra work beyond
500 * what lwkt_sendmsg() would have already had to do to schedule the target
504 schednetisr_remote(void *data)
506 int num = (int)(intptr_t)data;
507 struct netisr *ni = &netisrs[num];
508 lwkt_port_t port = &netisr_cpu[0].td_msgport;
511 pmsg = &netisrs[num].ni_netmsg;
512 if (pmsg->lmsg.ms_flags & MSGF_DONE) {
513 netmsg_init(pmsg, NULL, &netisr_adone_rport, 0, ni->ni_handler);
514 pmsg->lmsg.u.ms_result = num;
515 lwkt_sendmsg(port, &pmsg->lmsg);
522 KASSERT((num > 0 && num <= NELEM(netisrs)),
523 ("schednetisr: bad isr %d", num));
524 KKASSERT(netisrs[num].ni_handler != NULL);
526 if (mycpu->gd_cpuid != 0) {
527 lwkt_send_ipiq(globaldata_find(0),
528 schednetisr_remote, (void *)(intptr_t)num);
531 schednetisr_remote((void *)(intptr_t)num);
536 schednetisr_remote((void *)(intptr_t)num);