lustre/ptlrpc/service.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2002 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   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.
  11  *
  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.
  16  *
  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.
  20  *
  21  */
  22
  23 #define EXPORT_SYMTAB
  24 #define DEBUG_SUBSYSTEM S_RPC
  25
  26 #include <linux/lustre_net.h>
  27
  28 extern int request_in_callback(ptl_event_t *ev, void *data);
  29 extern int ptl_handled_rpc(struct ptlrpc_service *service, void *start);
  30
  31 static int ptlrpc_check_event(struct ptlrpc_service *svc,
  32                               struct ptlrpc_thread *thread, ptl_event_t *event)
  33 {
  34         int rc = 0;
  35         ENTRY;
  36
  37         spin_lock(&svc->srv_lock);
  38         if (sigismember(&(current->pending.signal), SIGKILL) ||
  39             sigismember(&(current->pending.signal), SIGTERM) ||
  40             sigismember(&(current->pending.signal), SIGINT)) {
  41                 thread->t_flags |= SVC_KILLED;
  42                 GOTO(out, rc = 1);
  43         }
  44
  45         if (thread->t_flags & SVC_STOPPING)
  46                 GOTO(out, rc = 1);
  47
  48         if (ptl_is_valid_handle(&svc->srv_eq_h)) {
  49                 int err;
  50                 err = PtlEQGet(svc->srv_eq_h, event);
  51
  52                 if (err == PTL_OK) {
  53                         thread->t_flags |= SVC_EVENT;
  54                         GOTO(out, rc = 1);
  55                 }
  56
  57                 if (err != PTL_EQ_EMPTY) {
  58                         CDEBUG(D_NET, "BUG: PtlEQGet returned %d\n", rc);
  59                         LBUG();
  60                 }
  61
  62                 GOTO(out, rc = 0);
  63         }
  64
  65         EXIT;
  66  out:
  67         spin_unlock(&svc->srv_lock);
  68         return rc;
  69 }
  70
  71 struct ptlrpc_service *
  72 ptlrpc_init_svc(__u32 bufsize, int req_portal, int rep_portal, char *uuid,
  73                 svc_handler_t handler)
  74 {
  75         int err;
  76         int rc, i;
  77         struct ptlrpc_service *service;
  78         ENTRY;
  79
  80         OBD_ALLOC(service, sizeof(*service));
  81         if (!service) {
  82                 LBUG();
  83                 RETURN(NULL);
  84         }
  85
  86         spin_lock_init(&service->srv_lock);
  87         INIT_LIST_HEAD(&service->srv_reqs);
  88         INIT_LIST_HEAD(&service->srv_threads);
  89         init_waitqueue_head(&service->srv_waitq);
  90
  91         service->srv_buf_size = bufsize;
  92         service->srv_rep_portal = rep_portal;
  93         service->srv_req_portal = req_portal;
  94         service->srv_handler = handler;
  95
  96         err = kportal_uuid_to_peer(uuid, &service->srv_self);
  97         if (err) {
  98                 CERROR("cannot get peer for uuid '%s'", uuid);
  99                 GOTO(err_free, NULL);
 100         }
 101
 102         service->srv_ring_length = RPC_RING_LENGTH;
 103
 104         rc = PtlEQAlloc(service->srv_self.peer_ni, 128, request_in_callback,
 105                         service, &(service->srv_eq_h));
 106
 107         if (rc != PTL_OK) {
 108                 CERROR("PtlEQAlloc failed: %d\n", rc);
 109                 LBUG();
 110                 GOTO(err_free, NULL);
 111         }
 112
 113         for (i = 0; i < service->srv_ring_length; i++) {
 114                 OBD_ALLOC(service->srv_buf[i], service->srv_buf_size);
 115                 if (service->srv_buf[i] == NULL) {
 116                         CERROR("no memory\n");
 117                         LBUG();
 118                         GOTO(err_ring, NULL);
 119                 }
 120                 service->srv_ref_count[i] = 0;
 121                 ptlrpc_link_svc_me(service, i);
 122         }
 123
 124         CDEBUG(D_NET, "Starting service listening on portal %d\n",
 125                service->srv_req_portal);
 126
 127         RETURN(service);
 128 err_ring:
 129         service->srv_ring_length = i;
 130         rpc_unregister_service(service); // XXX verify this is right
 131         PtlEQFree(service->srv_eq_h);
 132 err_free:
 133         OBD_FREE(service, sizeof(*service));
 134         return NULL;
 135 }
 136
 137 static int handle_incoming_request(struct obd_device *obddev,
 138                                    struct ptlrpc_service *svc,
 139                                    ptl_event_t *event)
 140 {
 141         struct ptlrpc_request request;
 142         struct lustre_peer peer;
 143         void *start;
 144         int rc;
 145
 146         /* FIXME: If we move to an event-driven model, we should put the request
 147          * on the stack of mds_handle instead. */
 148         start = event->mem_desc.start;
 149         memset(&request, 0, sizeof(request));
 150         request.rq_obd = obddev;
 151         request.rq_reqmsg = event->mem_desc.start + event->offset;
 152         request.rq_reqlen = event->mem_desc.length;
 153
 154         if (request.rq_reqmsg->xid != event->match_bits)
 155                 LBUG();
 156
 157         CDEBUG(D_NET, "got req %d\n", request.rq_reqmsg->xid);
 158
 159         peer.peer_nid = event->initiator.nid;
 160         /* FIXME: this NI should be the incoming NI.
 161          * We don't know how to find that from here. */
 162         peer.peer_ni = svc->srv_self.peer_ni;
 163
 164         if (request.rq_reqmsg->conn) {
 165                 request.rq_connection =
 166                         (void *)(unsigned long)request.rq_reqmsg->conn;
 167                 if (request.rq_reqmsg->token !=
 168                     request.rq_connection->c_token) {
 169                         struct ptlrpc_connection *tmp;
 170                         tmp = ptlrpc_get_connection(&peer);
 171                         CERROR("rq_reqmsg->conn: %p\n", request.rq_connection);
 172                         CERROR("real connection: %p\n", tmp);
 173                         CERROR("rq_reqmsg->token: %Lu\n",
 174                                (unsigned long long)request.rq_reqmsg->token);
 175                         CERROR("real token      : %Lu\n",
 176                                (unsigned long long)tmp->c_token);
 177                         LBUG();
 178                 }
 179                 ptlrpc_connection_addref(request.rq_connection);
 180         } else {
 181                 /*
 182                   PHIL? should we perhaps only do this when
 183                    we get an incoming connmgr_connect request?
 184                 */
 185                 request.rq_connection = ptlrpc_get_connection(&peer);
 186                 if (!request.rq_connection)
 187                         LBUG();
 188         }
 189
 190         spin_unlock(&svc->srv_lock);
 191         rc = svc->srv_handler(obddev, svc, &request);
 192         ptlrpc_put_connection(request.rq_connection);
 193         ptl_handled_rpc(svc, start);
 194         return rc;
 195 }
 196
 197 static int ptlrpc_main(void *arg)
 198 {
 199         int rc;
 200         struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
 201         struct obd_device *obddev = data->dev;
 202         struct ptlrpc_service *svc = data->svc;
 203         struct ptlrpc_thread *thread = data->thread;
 204
 205         ENTRY;
 206
 207         lock_kernel();
 208         daemonize();
 209         spin_lock_irq(&current->sigmask_lock);
 210         sigfillset(&current->blocked);
 211         recalc_sigpending(current);
 212         spin_unlock_irq(&current->sigmask_lock);
 213
 214         sprintf(current->comm, data->name);
 215
 216         /* Record that the thread is running */
 217         thread->t_flags = SVC_RUNNING;
 218         wake_up(&thread->t_ctl_waitq);
 219
 220         /* XXX maintain a list of all managed devices: insert here */
 221
 222         /* And now, loop forever on requests */
 223         while (1) {
 224                 ptl_event_t event;
 225
 226                 wait_event(svc->srv_waitq,
 227                            ptlrpc_check_event(svc, thread, &event));
 228
 229                 spin_lock(&svc->srv_lock);
 230                 if (thread->t_flags & SVC_SIGNAL) {
 231                         thread->t_flags &= ~SVC_SIGNAL;
 232                         spin_unlock(&svc->srv_lock);
 233                         EXIT;
 234                         break;
 235                 }
 236
 237                 if (thread->t_flags & SVC_STOPPING) {
 238                         thread->t_flags &= ~SVC_STOPPING;
 239                         spin_unlock(&svc->srv_lock);
 240                         EXIT;
 241                         break;
 242                 }
 243
 244                 if (thread->t_flags & SVC_EVENT) {
 245                         thread->t_flags &= ~SVC_EVENT;
 246                         rc = handle_incoming_request(obddev, svc, &event);
 247                         thread->t_flags &= ~SVC_EVENT;
 248                         continue;
 249                 }
 250
 251                 CERROR("unknown break in service");
 252                 spin_unlock(&svc->srv_lock);
 253                 EXIT;
 254                 break;
 255         }
 256
 257         thread->t_flags = SVC_STOPPED;
 258         wake_up(&thread->t_ctl_waitq);
 259         CDEBUG(D_NET, "service thread exiting, process %d\n", current->pid);
 260         return 0;
 261 }
 262
 263 static void ptlrpc_stop_thread(struct ptlrpc_service *svc,
 264                                struct ptlrpc_thread *thread)
 265 {
 266         thread->t_flags = SVC_STOPPING;
 267
 268         wake_up(&svc->srv_waitq);
 269         wait_event_interruptible(thread->t_ctl_waitq,
 270                                  (thread->t_flags & SVC_STOPPED));
 271 }
 272
 273 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
 274 {
 275         spin_lock(&svc->srv_lock);
 276         while (!list_empty(&svc->srv_threads)) {
 277                 struct ptlrpc_thread *thread;
 278                 thread = list_entry(svc->srv_threads.next, struct ptlrpc_thread,
 279                                     t_link);
 280                 spin_unlock(&svc->srv_lock);
 281                 ptlrpc_stop_thread(svc, thread);
 282                 spin_lock(&svc->srv_lock);
 283                 list_del(&thread->t_link);
 284                 OBD_FREE(thread, sizeof(*thread));
 285         }
 286         spin_unlock(&svc->srv_lock);
 287 }
 288
 289 int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc,
 290                         char *name)
 291 {
 292         struct ptlrpc_svc_data d;
 293         struct ptlrpc_thread *thread;
 294         int rc;
 295         ENTRY;
 296
 297         OBD_ALLOC(thread, sizeof(*thread));
 298         if (thread == NULL) {
 299                 LBUG();
 300                 RETURN(-ENOMEM);
 301         }
 302         init_waitqueue_head(&thread->t_ctl_waitq);
 303
 304         d.dev = dev;
 305         d.svc = svc;
 306         d.name = name;
 307         d.thread = thread;
 308
 309         spin_lock(&svc->srv_lock);
 310         list_add(&thread->t_link, &svc->srv_threads);
 311         spin_unlock(&svc->srv_lock);
 312
 313         rc = kernel_thread(ptlrpc_main, (void *) &d,
 314                            CLONE_VM | CLONE_FS | CLONE_FILES);
 315         if (rc < 0) {
 316                 CERROR("cannot start thread\n");
 317                 RETURN(-EINVAL);
 318         }
 319         wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_RUNNING);
 320
 321         RETURN(0);
 322 }
 323
 324 int rpc_unregister_service(struct ptlrpc_service *service)
 325 {
 326         int rc, i;
 327
 328         for (i = 0; i < service->srv_ring_length; i++) {
 329                 if (ptl_is_valid_handle(&(service->srv_me_h[i]))) {
 330                         rc = PtlMEUnlink(service->srv_me_h[i]);
 331                         if (rc)
 332                                 CERROR("PtlMEUnlink failed: %d\n", rc);
 333                         ptl_set_inv_handle(&(service->srv_me_h[i]));
 334                 }
 335
 336                 if (service->srv_buf[i] != NULL)
 337                         OBD_FREE(service->srv_buf[i], service->srv_buf_size);
 338                 service->srv_buf[i] = NULL;
 339         }
 340
 341         rc = PtlEQFree(service->srv_eq_h);
 342         if (rc)
 343                 CERROR("PtlEQFree failed: %d\n", rc);
 344
 345         return 0;
 346 }