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