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/obd_support.h>
26 #include <linux/obd_class.h>
27 #include <linux/lustre_net.h>
29 extern int request_in_callback(ptl_event_t *ev);
30 extern int ptl_handled_rpc(struct ptlrpc_service *service, void *start);
32 static int ptlrpc_check_event(struct ptlrpc_service *svc,
33 struct ptlrpc_thread *thread, ptl_event_t *event)
38 spin_lock(&svc->srv_lock);
39 if (thread->t_flags & SVC_STOPPING)
42 if (ptl_is_valid_handle(&svc->srv_eq_h)) {
44 err = PtlEQGet(svc->srv_eq_h, event);
47 thread->t_flags |= SVC_EVENT;
51 if (err != PTL_EQ_EMPTY) {
52 CERROR("BUG: PtlEQGet returned %d\n", rc);
61 spin_unlock(&svc->srv_lock);
65 struct ptlrpc_service *
66 ptlrpc_init_svc(__u32 bufsize, int req_portal, int rep_portal, char *uuid,
67 svc_handler_t handler, char *name)
71 struct ptlrpc_service *service;
74 OBD_ALLOC(service, sizeof(*service));
80 service->srv_name = name;
81 spin_lock_init(&service->srv_lock);
82 INIT_LIST_HEAD(&service->srv_reqs);
83 INIT_LIST_HEAD(&service->srv_threads);
84 init_waitqueue_head(&service->srv_waitq);
86 service->srv_buf_size = bufsize;
87 service->srv_rep_portal = rep_portal;
88 service->srv_req_portal = req_portal;
89 service->srv_handler = handler;
91 err = kportal_uuid_to_peer(uuid, &service->srv_self);
93 CERROR("cannot get peer for uuid '%s'\n", uuid);
94 OBD_FREE(service, sizeof(*service));
98 service->srv_ring_length = RPC_RING_LENGTH;
100 rc = PtlEQAlloc(service->srv_self.peer_ni, 1024, request_in_callback,
101 &(service->srv_eq_h));
104 CERROR("PtlEQAlloc failed: %d\n", rc);
106 OBD_FREE(service, sizeof(*service));
110 for (i = 0; i < service->srv_ring_length; i++) {
111 OBD_ALLOC(service->srv_buf[i], service->srv_buf_size);
112 if (service->srv_buf[i] == NULL) {
113 CERROR("no memory\n");
115 GOTO(err_ring, NULL);
117 service->srv_ref_count[i] = 0;
118 ptlrpc_link_svc_me(service, i);
121 CDEBUG(D_NET, "Starting service listening on portal %d\n",
122 service->srv_req_portal);
126 service->srv_ring_length = i;
127 ptlrpc_unregister_service(service);
131 static int handle_incoming_request(struct obd_device *obddev,
132 struct ptlrpc_service *svc,
135 struct ptlrpc_request request;
136 struct lustre_peer peer;
140 /* FIXME: If we move to an event-driven model, we should put the request
141 * on the stack of mds_handle instead. */
142 LASSERT ((event->mem_desc.options & PTL_MD_IOV) == 0);
143 start = event->mem_desc.start;
145 memset(&request, 0, sizeof(request));
146 request.rq_svc = svc;
147 request.rq_obd = obddev;
148 request.rq_xid = event->match_bits;
149 request.rq_reqmsg = event->mem_desc.start + event->offset;
150 request.rq_reqlen = event->mem_desc.length;
152 if (request.rq_reqlen < sizeof(struct lustre_msg)) {
153 CERROR("incomplete request (%d): ptl %d from %Lx xid %Ld\n",
154 request.rq_reqlen, svc->srv_req_portal,
155 event->initiator.nid, request.rq_xid);
156 spin_unlock(&svc->srv_lock);
160 if (request.rq_reqmsg->magic != PTLRPC_MSG_MAGIC) {
161 CERROR("wrong lustre_msg magic %d: ptl %d from %Lx xid %Ld\n",
162 request.rq_reqmsg->magic, svc->srv_req_portal,
163 event->initiator.nid, request.rq_xid);
164 spin_unlock(&svc->srv_lock);
168 if (request.rq_reqmsg->version != PTLRPC_MSG_VERSION) {
169 CERROR("wrong lustre_msg version %d: ptl %d from %Lx xid %Ld\n",
170 request.rq_reqmsg->version, svc->srv_req_portal,
171 event->initiator.nid, request.rq_xid);
172 spin_unlock(&svc->srv_lock);
176 CDEBUG(D_NET, "got req %Ld\n", request.rq_xid);
178 peer.peer_nid = event->initiator.nid;
179 /* FIXME: this NI should be the incoming NI.
180 * We don't know how to find that from here. */
181 peer.peer_ni = svc->srv_self.peer_ni;
183 request.rq_export = class_conn2export((struct lustre_handle *) request.rq_reqmsg);
185 if (request.rq_export) {
186 request.rq_connection = request.rq_export->exp_connection;
187 ptlrpc_connection_addref(request.rq_connection);
189 request.rq_connection = ptlrpc_get_connection(&peer);
192 spin_unlock(&svc->srv_lock);
193 rc = svc->srv_handler(&request);
194 ptlrpc_put_connection(request.rq_connection);
195 ptl_handled_rpc(svc, start);
199 void ptlrpc_rotate_reqbufs(struct ptlrpc_service *service,
204 LASSERT ((ev->mem_desc.options & PTL_MD_IOV) == 0);
206 for (index = 0; index < service->srv_ring_length; index++)
207 if (service->srv_buf[index] == ev->mem_desc.start)
210 if (index == service->srv_ring_length)
213 service->srv_ref_count[index]++;
215 if (ptl_is_valid_handle(&ev->unlinked_me)) {
218 for (idx = 0; idx < service->srv_ring_length; idx++)
219 if (service->srv_me_h[idx].handle_idx ==
220 ev->unlinked_me.handle_idx)
222 if (idx == service->srv_ring_length)
225 CDEBUG(D_NET, "unlinked %d\n", idx);
226 ptl_set_inv_handle(&(service->srv_me_h[idx]));
228 if (service->srv_ref_count[idx] == 0)
229 ptlrpc_link_svc_me(service, idx);
233 static int ptlrpc_main(void *arg)
236 struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
237 struct obd_device *obddev = data->dev;
238 struct ptlrpc_service *svc = data->svc;
239 struct ptlrpc_thread *thread = data->thread;
245 spin_lock_irq(¤t->sigmask_lock);
246 sigfillset(¤t->blocked);
247 recalc_sigpending(current);
248 spin_unlock_irq(¤t->sigmask_lock);
250 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);
268 if (thread->t_flags & SVC_STOPPING) {
269 thread->t_flags &= ~SVC_STOPPING;
270 spin_unlock(&svc->srv_lock);
275 if (thread->t_flags & SVC_EVENT) {
276 thread->t_flags &= ~SVC_EVENT;
277 ptlrpc_rotate_reqbufs(svc, &event);
279 rc = handle_incoming_request(obddev, svc, &event);
280 thread->t_flags &= ~SVC_EVENT;
284 CERROR("unknown break in service");
285 spin_unlock(&svc->srv_lock);
290 thread->t_flags = SVC_STOPPED;
291 wake_up(&thread->t_ctl_waitq);
292 CDEBUG(D_NET, "service thread exiting, process %d\n", current->pid);
296 static void ptlrpc_stop_thread(struct ptlrpc_service *svc,
297 struct ptlrpc_thread *thread)
299 spin_lock(&svc->srv_lock);
300 thread->t_flags = SVC_STOPPING;
301 spin_unlock(&svc->srv_lock);
303 wake_up(&svc->srv_waitq);
304 wait_event(thread->t_ctl_waitq, (thread->t_flags & SVC_STOPPED));
307 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
309 spin_lock(&svc->srv_lock);
310 while (!list_empty(&svc->srv_threads)) {
311 struct ptlrpc_thread *thread;
312 thread = list_entry(svc->srv_threads.next, struct ptlrpc_thread,
314 spin_unlock(&svc->srv_lock);
315 ptlrpc_stop_thread(svc, thread);
316 spin_lock(&svc->srv_lock);
317 list_del(&thread->t_link);
318 OBD_FREE(thread, sizeof(*thread));
320 spin_unlock(&svc->srv_lock);
323 int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc,
326 struct ptlrpc_svc_data d;
327 struct ptlrpc_thread *thread;
331 OBD_ALLOC(thread, sizeof(*thread));
332 if (thread == NULL) {
336 init_waitqueue_head(&thread->t_ctl_waitq);
343 spin_lock(&svc->srv_lock);
344 list_add(&thread->t_link, &svc->srv_threads);
345 spin_unlock(&svc->srv_lock);
347 rc = kernel_thread(ptlrpc_main, (void *) &d,
348 CLONE_VM | CLONE_FS | CLONE_FILES);
350 CERROR("cannot start thread\n");
351 OBD_FREE(thread, sizeof(*thread));
354 wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_RUNNING);
359 int ptlrpc_unregister_service(struct ptlrpc_service *service)
363 for (i = 0; i < service->srv_ring_length; i++) {
364 if (ptl_is_valid_handle(&(service->srv_me_h[i]))) {
365 rc = PtlMEUnlink(service->srv_me_h[i]);
367 CERROR("PtlMEUnlink failed: %d\n", rc);
368 ptl_set_inv_handle(&(service->srv_me_h[i]));
371 if (service->srv_buf[i] != NULL)
372 OBD_FREE(service->srv_buf[i], service->srv_buf_size);
373 service->srv_buf[i] = NULL;
376 rc = PtlEQFree(service->srv_eq_h);
378 CERROR("PtlEQFree failed: %d\n", rc);
380 if (!list_empty(&service->srv_reqs)) {
381 // XXX reply with errors and clean up
382 CERROR("Request list not empty!\n");
386 OBD_FREE(service, sizeof(*service));