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 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * $DragonFly: src/sys/net/netisr.c,v 1.19 2004/07/08 22:07:34 hsu Exp $
39 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
41 * License terms: all terms for the DragonFly license above plus the following:
43 * 4. All advertising materials mentioning features or use of this software
44 * must display the following acknowledgement:
46 * This product includes software developed by Jeffrey M. Hsu
47 * for the DragonFly Project.
49 * This requirement may be waived with permission from Jeffrey Hsu.
50 * This requirement will sunset and may be removed on July 8 2005,
51 * after which the standard DragonFly license (as shown above) will
55 #include <sys/param.h>
56 #include <sys/systm.h>
57 #include <sys/kernel.h>
58 #include <sys/malloc.h>
59 #include <sys/msgport.h>
61 #include <sys/interrupt.h>
62 #include <sys/socket.h>
63 #include <sys/sysctl.h>
65 #include <net/if_var.h>
66 #include <net/netisr.h>
67 #include <machine/cpufunc.h>
68 #include <machine/ipl.h>
70 #include <sys/thread2.h>
71 #include <sys/msgport2.h>
73 static struct netisr netisrs[NETISR_MAX];
75 /* Per-CPU thread to handle any protocol. */
76 struct thread netisr_cpu[MAXCPU];
77 lwkt_port netisr_afree_rport;
78 lwkt_port netisr_adone_rport;
79 lwkt_port netisr_sync_port;
82 * netisr_afree_rport replymsg function, only used to handle async
83 * messages which the sender has abandoned to their fate.
86 netisr_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
92 netisr_autodone_reply(lwkt_port_t port, lwkt_msg_t msg)
95 msg->ms_flags |= MSGF_DONE|MSGF_REPLY1;
100 * We must construct a custom putport function (which runs in the context
101 * of the message originator)
103 * Our custom putport must check for self-referential messages, which can
104 * occur when the so_upcall routine is called (e.g. nfs). Self referential
105 * messages are executed synchronously. However, we must panic if the message
106 * is not marked DONE on completion because the self-referential case cannot
107 * block without deadlocking.
109 * note: ms_target_port does not need to be set when returning a synchronous
113 netmsg_put_port(lwkt_port_t port, lwkt_msg_t lmsg)
117 if ((lmsg->ms_flags & MSGF_ASYNC) == 0 && port->mp_td == curthread) {
118 error = lmsg->ms_cmd.cm_func(lmsg);
119 if (error == EASYNC && (lmsg->ms_flags & MSGF_DONE) == 0)
120 panic("netmsg_put_port: self-referential deadlock on netport");
123 return(lwkt_default_putport(port, lmsg));
128 * UNIX DOMAIN sockets still have to run their uipc functions synchronously,
129 * because they depend on the user proc context for a number of things
130 * (like creds) which we have not yet incorporated into the message structure.
132 * However, we maintain or message/port abstraction. Having a special
133 * synchronous port which runs the commands synchronously gives us the
134 * ability to serialize operations in one place later on when we start
137 * We clear MSGF_DONE prior to executing the message in order to close
138 * any potential replymsg races with the flags field. If a synchronous
139 * result code is returned we set MSGF_DONE again. MSGF_DONE's flag state
140 * must be correct or the caller will be confused.
143 netmsg_sync_putport(lwkt_port_t port, lwkt_msg_t lmsg)
147 lmsg->ms_flags &= ~MSGF_DONE;
148 lmsg->ms_target_port = port; /* required for abort */
149 error = lmsg->ms_cmd.cm_func(lmsg);
151 error = lwkt_waitmsg(lmsg);
153 lmsg->ms_flags |= MSGF_DONE;
158 netmsg_sync_abortport(lwkt_port_t port, lwkt_msg_t lmsg)
160 lmsg->ms_abort_port = lmsg->ms_reply_port;
161 lmsg->ms_flags |= MSGF_ABORTED;
162 lmsg->ms_abort.cm_func(lmsg);
171 * Create default per-cpu threads for generic protocol handling.
173 for (i = 0; i < ncpus; ++i) {
174 lwkt_create(netmsg_service_loop, NULL, NULL, &netisr_cpu[i], 0, i,
176 netisr_cpu[i].td_msgport.mp_putport = netmsg_put_port;
180 * The netisr_afree_rport is a special reply port which automatically
181 * frees the replied message. The netisr_adone_rport() simply marks
182 * the message as being done.
184 lwkt_initport(&netisr_afree_rport, NULL);
185 netisr_afree_rport.mp_replyport = netisr_autofree_reply;
186 lwkt_initport(&netisr_adone_rport, NULL);
187 netisr_adone_rport.mp_replyport = netisr_autodone_reply;
190 * The netisr_syncport is a special port which executes the message
191 * synchronously and waits for it if EASYNC is returned.
193 lwkt_initport(&netisr_sync_port, NULL);
194 netisr_sync_port.mp_putport = netmsg_sync_putport;
195 netisr_sync_port.mp_abortport = netmsg_sync_abortport;
198 SYSINIT(netisr, SI_SUB_PROTO_BEGIN, SI_ORDER_FIRST, netisr_init, NULL);
201 netmsg_service_loop(void *arg)
205 while ((msg = lwkt_waitport(&curthread->td_msgport, NULL))) {
206 msg->nm_lmsg.ms_cmd.cm_func(&msg->nm_lmsg);
211 * Call the netisr directly.
212 * Queueing may be done in the msg port layer at its discretion.
215 netisr_dispatch(int num, struct mbuf *m)
217 /* just queue it for now XXX JH */
218 netisr_queue(num, m);
222 * Same as netisr_dispatch(), but always queue.
223 * This is either used in places where we are not confident that
224 * direct dispatch is possible, or where queueing is required.
227 netisr_queue(int num, struct mbuf *m)
230 struct netmsg_packet *pmsg;
233 KASSERT((num > 0 && num <= (sizeof(netisrs)/sizeof(netisrs[0]))),
234 ("netisr_queue: bad isr %d", num));
237 if (ni->ni_handler == NULL) {
238 printf("netisr_queue: unregistered isr %d\n", num);
242 if (!(port = ni->ni_mport(m)))
245 /* use better message allocation system with limits later XXX JH */
246 pmsg = malloc(sizeof(struct netmsg_packet), M_LWKTMSG, M_WAITOK);
248 lwkt_initmsg(&pmsg->nm_lmsg, &netisr_afree_rport, 0,
249 lwkt_cmd_func((void *)ni->ni_handler), lwkt_cmd_op_none);
251 pmsg->nm_lmsg.u.ms_result = num;
252 lwkt_sendmsg(port, &pmsg->nm_lmsg);
257 netisr_register(int num, lwkt_portfn_t mportfn, netisr_fn_t handler)
259 KASSERT((num > 0 && num <= (sizeof(netisrs)/sizeof(netisrs[0]))),
260 ("netisr_register: bad isr %d", num));
261 lwkt_initmsg(&netisrs[num].ni_netmsg.nm_lmsg, &netisr_adone_rport, 0,
262 lwkt_cmd_op_none, lwkt_cmd_op_none);
263 netisrs[num].ni_mport = mportfn;
264 netisrs[num].ni_handler = handler;
268 netisr_unregister(int num)
270 KASSERT((num > 0 && num <= (sizeof(netisrs)/sizeof(netisrs[0]))),
271 ("unregister_netisr: bad isr number: %d\n", num));
278 * Return message port for default handler thread on CPU 0.
281 cpu0_portfn(struct mbuf *m)
283 return (&netisr_cpu[0].td_msgport);
288 cpu0_soport(struct socket *so __unused, struct sockaddr *nam __unused,
291 return (&netisr_cpu[0].td_msgport);
295 sync_soport(struct socket *so __unused, struct sockaddr *nam __unused,
298 return (&netisr_sync_port);
302 * schednetisr() is used to call the netisr handler from the appropriate
303 * netisr thread for polling and other purposes.
305 * This function may be called from a hard interrupt or IPI and must be
306 * MP SAFE and non-blocking. We use a fixed per-cpu message instead of
307 * trying to allocate one. We must get ourselves onto the target cpu
308 * to safely check the MSGF_DONE bit on the message but since the message
309 * will be sent to that cpu anyway this does not add any extra work beyond
310 * what lwkt_sendmsg() would have already had to do to schedule the target
314 schednetisr_remote(void *data)
317 struct netisr *ni = &netisrs[num];
318 lwkt_port_t port = &netisr_cpu[0].td_msgport;
321 pmsg = &netisrs[num].ni_netmsg;
323 if (pmsg->nm_lmsg.ms_flags & MSGF_DONE) {
324 lwkt_initmsg(&pmsg->nm_lmsg, &netisr_adone_rport, 0,
325 lwkt_cmd_func((void *)ni->ni_handler), lwkt_cmd_op_none);
326 pmsg->nm_lmsg.u.ms_result = num;
327 lwkt_sendmsg(port, &pmsg->nm_lmsg);
335 KASSERT((num > 0 && num <= (sizeof(netisrs)/sizeof(netisrs[0]))),
336 ("schednetisr: bad isr %d", num));
338 if (mycpu->gd_cpuid != 0)
339 lwkt_send_ipiq(globaldata_find(0), schednetisr_remote, (void *)num);
341 schednetisr_remote((void *)num);
343 schednetisr_remote((void *)num);