1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2002 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #define DEBUG_SUBSYSTEM S_RPC
25 #include <linux/lustre_net.h>
27 extern int request_in_callback(ptl_event_t *ev);
28 extern int ptl_handled_rpc(struct ptlrpc_service *service, void *start);
30 static int ptlrpc_check_event(struct ptlrpc_service *svc,
31 struct ptlrpc_thread *thread, ptl_event_t *event)
36 spin_lock(&svc->srv_lock);
37 if (sigismember(&(current->pending.signal), SIGKILL) ||
38 sigismember(&(current->pending.signal), SIGTERM) ||
39 sigismember(&(current->pending.signal), SIGINT)) {
40 thread->t_flags |= SVC_KILLED;
44 if (thread->t_flags & SVC_STOPPING)
47 if (ptl_is_valid_handle(&svc->srv_eq_h)) {
49 err = PtlEQGet(svc->srv_eq_h, event);
52 thread->t_flags |= SVC_EVENT;
56 if (err != PTL_EQ_EMPTY) {
57 CDEBUG(D_NET, "BUG: PtlEQGet returned %d\n", rc);
66 spin_unlock(&svc->srv_lock);
70 struct ptlrpc_service *
71 ptlrpc_init_svc(__u32 bufsize, int req_portal, int rep_portal, char *uuid,
72 svc_handler_t handler)
76 struct ptlrpc_service *service;
79 OBD_ALLOC(service, sizeof(*service));
85 spin_lock_init(&service->srv_lock);
86 INIT_LIST_HEAD(&service->srv_reqs);
87 INIT_LIST_HEAD(&service->srv_threads);
88 init_waitqueue_head(&service->srv_waitq);
90 service->srv_buf_size = bufsize;
91 service->srv_rep_portal = rep_portal;
92 service->srv_req_portal = req_portal;
93 service->srv_handler = handler;
95 err = kportal_uuid_to_peer(uuid, &service->srv_self);
97 CERROR("cannot get peer for uuid '%s'", uuid);
98 OBD_FREE(service, sizeof(*service));
102 service->srv_ring_length = RPC_RING_LENGTH;
104 rc = PtlEQAlloc(service->srv_self.peer_ni, 128, request_in_callback,
105 &(service->srv_eq_h));
108 CERROR("PtlEQAlloc failed: %d\n", rc);
110 OBD_FREE(service, sizeof(*service));
114 for (i = 0; i < service->srv_ring_length; i++) {
115 OBD_ALLOC(service->srv_buf[i], service->srv_buf_size);
116 if (service->srv_buf[i] == NULL) {
117 CERROR("no memory\n");
119 GOTO(err_ring, NULL);
121 service->srv_ref_count[i] = 0;
122 ptlrpc_link_svc_me(service, i);
125 CDEBUG(D_NET, "Starting service listening on portal %d\n",
126 service->srv_req_portal);
130 service->srv_ring_length = i;
131 ptlrpc_unregister_service(service);
135 static int handle_incoming_request(struct obd_device *obddev,
136 struct ptlrpc_service *svc,
139 struct ptlrpc_request request;
140 struct lustre_peer peer;
144 /* FIXME: If we move to an event-driven model, we should put the request
145 * on the stack of mds_handle instead. */
146 start = event->mem_desc.start;
148 memset(&request, 0, sizeof(request));
149 request.rq_svc = svc;
150 request.rq_obd = obddev;
151 request.rq_xid = event->match_bits;
152 request.rq_reqmsg = event->mem_desc.start + event->offset;
153 request.rq_reqlen = event->mem_desc.length;
155 if (request.rq_reqlen < sizeof(struct lustre_msg)) {
156 CERROR("incomplete request: ptl %d from %Lx xid %Ld\n",
157 svc->srv_req_portal, event->initiator.nid,
159 spin_unlock(&svc->srv_lock);
163 if (request.rq_reqmsg->magic != PTLRPC_MSG_MAGIC) {
164 CERROR("wrong lustre_msg magic: ptl %d from %Lx xid %Ld\n",
165 svc->srv_req_portal, event->initiator.nid,
167 spin_unlock(&svc->srv_lock);
171 if (request.rq_reqmsg->version != PTLRPC_MSG_VERSION) {
172 CERROR("wrong lustre_msg version: ptl %d from %Lx xid %Ld\n",
173 svc->srv_req_portal, event->initiator.nid,
175 spin_unlock(&svc->srv_lock);
179 CDEBUG(D_NET, "got req %Ld\n", request.rq_xid);
181 peer.peer_nid = event->initiator.nid;
182 /* FIXME: this NI should be the incoming NI.
183 * We don't know how to find that from here. */
184 peer.peer_ni = svc->srv_self.peer_ni;
186 request.rq_export = class_conn2export((struct lustre_handle *) request.rq_reqmsg);
188 if (request.rq_export) {
189 request.rq_connection = request.rq_export->export_connection;
190 ptlrpc_connection_addref(request.rq_connection);
192 request.rq_connection = ptlrpc_get_connection(&peer);
195 spin_unlock(&svc->srv_lock);
196 rc = svc->srv_handler(&request);
197 ptlrpc_put_connection(request.rq_connection);
198 ptl_handled_rpc(svc, start);
202 void ptlrpc_rotate_reqbufs(struct ptlrpc_service *service,
207 for (index = 0; index < service->srv_ring_length; index++)
208 if (service->srv_buf[index] == ev->mem_desc.start)
211 if (index == service->srv_ring_length)
214 service->srv_ref_count[index]++;
216 if (ptl_is_valid_handle(&ev->unlinked_me)) {
219 for (idx = 0; idx < service->srv_ring_length; idx++)
220 if (service->srv_me_h[idx].handle_idx ==
221 ev->unlinked_me.handle_idx)
223 if (idx == service->srv_ring_length)
226 CDEBUG(D_NET, "unlinked %d\n", idx);
227 ptl_set_inv_handle(&(service->srv_me_h[idx]));
229 if (service->srv_ref_count[idx] == 0)
230 ptlrpc_link_svc_me(service, idx);
234 static int ptlrpc_main(void *arg)
237 struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
238 struct obd_device *obddev = data->dev;
239 struct ptlrpc_service *svc = data->svc;
240 struct ptlrpc_thread *thread = data->thread;
246 spin_lock_irq(¤t->sigmask_lock);
247 sigfillset(¤t->blocked);
248 recalc_sigpending(current);
249 spin_unlock_irq(¤t->sigmask_lock);
251 sprintf(current->comm, data->name);
253 /* Record that the thread is running */
254 thread->t_flags = SVC_RUNNING;
255 wake_up(&thread->t_ctl_waitq);
257 /* XXX maintain a list of all managed devices: insert here */
259 /* And now, loop forever on requests */
263 wait_event(svc->srv_waitq,
264 ptlrpc_check_event(svc, thread, &event));
266 spin_lock(&svc->srv_lock);
267 if (thread->t_flags & SVC_SIGNAL) {
268 thread->t_flags &= ~SVC_SIGNAL;
269 spin_unlock(&svc->srv_lock);
274 if (thread->t_flags & SVC_STOPPING) {
275 thread->t_flags &= ~SVC_STOPPING;
276 spin_unlock(&svc->srv_lock);
281 if (thread->t_flags & SVC_EVENT) {
282 thread->t_flags &= ~SVC_EVENT;
283 ptlrpc_rotate_reqbufs(svc, &event);
285 rc = handle_incoming_request(obddev, svc, &event);
286 thread->t_flags &= ~SVC_EVENT;
290 CERROR("unknown break in service");
291 spin_unlock(&svc->srv_lock);
296 thread->t_flags = SVC_STOPPED;
297 wake_up(&thread->t_ctl_waitq);
298 CDEBUG(D_NET, "service thread exiting, process %d\n", current->pid);
302 static void ptlrpc_stop_thread(struct ptlrpc_service *svc,
303 struct ptlrpc_thread *thread)
305 spin_lock(&svc->srv_lock);
306 thread->t_flags = SVC_STOPPING;
307 spin_unlock(&svc->srv_lock);
309 wake_up(&svc->srv_waitq);
310 wait_event_interruptible(thread->t_ctl_waitq,
311 (thread->t_flags & SVC_STOPPED));
314 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
316 spin_lock(&svc->srv_lock);
317 while (!list_empty(&svc->srv_threads)) {
318 struct ptlrpc_thread *thread;
319 thread = list_entry(svc->srv_threads.next, struct ptlrpc_thread,
321 spin_unlock(&svc->srv_lock);
322 ptlrpc_stop_thread(svc, thread);
323 spin_lock(&svc->srv_lock);
324 list_del(&thread->t_link);
325 OBD_FREE(thread, sizeof(*thread));
327 spin_unlock(&svc->srv_lock);
330 int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc,
333 struct ptlrpc_svc_data d;
334 struct ptlrpc_thread *thread;
338 OBD_ALLOC(thread, sizeof(*thread));
339 if (thread == NULL) {
343 init_waitqueue_head(&thread->t_ctl_waitq);
350 spin_lock(&svc->srv_lock);
351 list_add(&thread->t_link, &svc->srv_threads);
352 spin_unlock(&svc->srv_lock);
354 rc = kernel_thread(ptlrpc_main, (void *) &d,
355 CLONE_VM | CLONE_FS | CLONE_FILES);
357 CERROR("cannot start thread\n");
360 wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_RUNNING);
365 int ptlrpc_unregister_service(struct ptlrpc_service *service)
369 for (i = 0; i < service->srv_ring_length; i++) {
370 if (ptl_is_valid_handle(&(service->srv_me_h[i]))) {
371 rc = PtlMEUnlink(service->srv_me_h[i]);
373 CERROR("PtlMEUnlink failed: %d\n", rc);
374 ptl_set_inv_handle(&(service->srv_me_h[i]));
377 if (service->srv_buf[i] != NULL)
378 OBD_FREE(service->srv_buf[i], service->srv_buf_size);
379 service->srv_buf[i] = NULL;
382 rc = PtlEQFree(service->srv_eq_h);
384 CERROR("PtlEQFree failed: %d\n", rc);
386 if (!list_empty(&service->srv_reqs)) {
387 // XXX reply with errors and clean up
388 CERROR("Request list not empty!\n");
391 OBD_FREE(service, sizeof(*service));