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
  25 #include <linux/config.h>
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28
  29 #define DEBUG_SUBSYSTEM S_RPC
  30
  31 #include <linux/obd_support.h>
  32 #include <linux/obd_class.h>
  33 #include <linux/lustre_net.h>
  34
  35 extern int server_request_callback(ptl_event_t *ev, void *data);
  36 extern int ptl_handled_rpc(struct ptlrpc_service *service, void *start);
  37
  38 static int ptlrpc_check_event(struct ptlrpc_service *svc)
  39 {
  40         int rc = 0;
  41
  42         spin_lock(&svc->srv_lock);
  43         if (sigismember(&(current->pending.signal), SIGKILL) ||
  44             sigismember(&(current->pending.signal), SIGSTOP) ||
  45             sigismember(&(current->pending.signal), SIGCONT) ||
  46             sigismember(&(current->pending.signal), SIGINT)) {
  47                 svc->srv_flags |= SVC_KILLED;
  48                 EXIT;
  49                 rc = 1;
  50                 goto out;
  51         }
  52
  53         if ( svc->srv_flags & SVC_STOPPING ) {
  54                 EXIT;
  55                 rc = 1;
  56                 goto out;
  57         }
  58
  59         if (svc->srv_flags & SVC_EVENT)
  60                 LBUG();
  61
  62         if ( svc->srv_eq_h ) {
  63                 int err;
  64                 err = PtlEQGet(svc->srv_eq_h, &svc->srv_ev);
  65
  66                 if (err == PTL_OK) {
  67                         svc->srv_flags |= SVC_EVENT;
  68                         EXIT;
  69                         rc = 1;
  70                         goto out;
  71                 }
  72
  73                 if (err != PTL_EQ_EMPTY) {
  74                         CDEBUG(D_NET, "BUG: PtlEQGet returned %d\n", rc);
  75                         LBUG();
  76                 }
  77
  78                 EXIT;
  79                 rc = 0;
  80                 goto out;
  81         }
  82
  83         if (!list_empty(&svc->srv_reqs)) {
  84                 svc->srv_flags |= SVC_LIST;
  85                 EXIT;
  86                 rc = 1;
  87                 goto out;
  88         }
  89
  90         EXIT;
  91  out:
  92         spin_unlock(&svc->srv_lock);
  93         return rc;
  94 }
  95
  96 struct ptlrpc_service *
  97 ptlrpc_init_svc(__u32 bufsize, int req_portal, int rep_portal, char *uuid,
  98                 svc_handler_t handler)
  99 {
 100         int err;
 101         int rc, i;
 102         struct ptlrpc_service *service;
 103
 104         OBD_ALLOC(service, sizeof(*service));
 105         if ( !service ) {
 106                 CERROR("no memory\n");
 107                 LBUG();
 108                 return NULL;
 109         }
 110
 111         memset(service, 0, sizeof(*service));
 112
 113         spin_lock_init(&service->srv_lock);
 114         INIT_LIST_HEAD(&service->srv_reqs);
 115         init_waitqueue_head(&service->srv_ctl_waitq);
 116         init_waitqueue_head(&service->srv_waitq);
 117
 118         service->srv_thread = NULL;
 119         service->srv_flags = 0;
 120
 121         service->srv_buf_size = bufsize;
 122         service->srv_rep_portal = rep_portal;
 123         service->srv_req_portal = req_portal;
 124         service->srv_handler = handler;
 125
 126         err = kportal_uuid_to_peer(uuid, &service->srv_self);
 127         if (err) {
 128                 CERROR("cannot get peer for uuid %s", uuid);
 129                 OBD_FREE(service, sizeof(*service));
 130                 return NULL;
 131         }
 132
 133         service->srv_ring_length = RPC_RING_LENGTH;
 134         service->srv_id.nid = PTL_ID_ANY;
 135         service->srv_id.pid = PTL_ID_ANY;
 136
 137         rc = PtlEQAlloc(service->srv_self.peer_ni, 128,
 138                         server_request_callback,
 139                         service, &(service->srv_eq_h));
 140
 141         if (rc != PTL_OK) {
 142                 CERROR("PtlEQAlloc failed: %d\n", rc);
 143                 LBUG();
 144                 return NULL;
 145         }
 146
 147         for (i = 0; i < service->srv_ring_length; i++) {
 148                 OBD_ALLOC(service->srv_buf[i], service->srv_buf_size);
 149                 if (service->srv_buf[i] == NULL) {
 150                         CERROR("no memory\n");
 151                         LBUG();
 152                         return NULL;
 153                 }
 154                 service->srv_ref_count[i] = 0;
 155                 ptlrpc_link_svc_me(service, i);
 156         }
 157
 158         CDEBUG(D_NET, "Starting service listening on portal %d\n",
 159                service->srv_req_portal);
 160
 161         return service;
 162 }
 163
 164 static int ptlrpc_main(void *arg)
 165 {
 166         int rc;
 167         struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
 168         struct obd_device *obddev = data->dev;
 169         struct ptlrpc_service *svc = data->svc;
 170
 171         ENTRY;
 172
 173         lock_kernel();
 174         daemonize();
 175         spin_lock_irq(&current->sigmask_lock);
 176         sigfillset(&current->blocked);
 177         recalc_sigpending(current);
 178         spin_unlock_irq(&current->sigmask_lock);
 179
 180         sprintf(current->comm, data->name);
 181
 182         /* Record that the  thread is running */
 183         svc->srv_thread = current;
 184         svc->srv_flags = SVC_RUNNING;
 185         wake_up(&svc->srv_ctl_waitq);
 186
 187         /* XXX maintain a list of all managed devices: insert here */
 188
 189         /* And now, loop forever on requests */
 190         while (1) {
 191                 wait_event(svc->srv_waitq, ptlrpc_check_event(svc));
 192
 193                 spin_lock(&svc->srv_lock);
 194                 if (svc->srv_flags & SVC_SIGNAL) {
 195                         EXIT;
 196                         spin_unlock(&svc->srv_lock);
 197                         break;
 198                 }
 199
 200                 if (svc->srv_flags & SVC_STOPPING) {
 201                         EXIT;
 202                         spin_unlock(&svc->srv_lock);
 203                         break;
 204                 }
 205
 206                 if (svc->srv_flags & SVC_EVENT) {
 207                         struct ptlrpc_request request;
 208                         void *start;
 209                         svc->srv_flags = SVC_RUNNING;
 210
 211                         /* FIXME: If we move to an event-driven model,
 212                          * we should put the request on the stack of
 213                          * mds_handle instead. */
 214                         start = svc->srv_ev.mem_desc.start;
 215                         memset(&request, 0, sizeof(request));
 216                         request.rq_obd = obddev;
 217                         request.rq_reqbuf = (svc->srv_ev.mem_desc.start +
 218                                              svc->srv_ev.offset);
 219                         request.rq_reqlen = svc->srv_ev.mem_desc.length;
 220                         request.rq_xid = svc->srv_ev.match_bits;
 221                         CDEBUG(D_NET, "got req %d\n", request.rq_xid);
 222
 223                         request.rq_peer.peer_nid = svc->srv_ev.initiator.nid;
 224                         /* FIXME: this NI should be the incoming NI.
 225                          * We don't know how to find that from here. */
 226                         request.rq_peer.peer_ni = svc->srv_self.peer_ni;
 227                         svc->srv_flags &= ~SVC_EVENT;
 228
 229                         spin_unlock(&svc->srv_lock);
 230                         rc = svc->srv_handler(obddev, svc, &request);
 231                         ptl_handled_rpc(svc, start);
 232                         continue;
 233                 }
 234
 235                 if (svc->srv_flags & SVC_LIST) {
 236                         struct ptlrpc_request *request;
 237                         svc->srv_flags = SVC_RUNNING;
 238
 239                         request = list_entry(svc->srv_reqs.next,
 240                                              struct ptlrpc_request,
 241                                              rq_list);
 242                         list_del(&request->rq_list);
 243                         spin_unlock(&svc->srv_lock);
 244                         rc = svc->srv_handler(obddev, svc, request);
 245                         continue;
 246                 }
 247                 CERROR("unknown break in service");
 248                 spin_unlock(&svc->srv_lock);
 249                 break;
 250         }
 251
 252         svc->srv_thread = NULL;
 253         svc->srv_flags = SVC_STOPPED;
 254         wake_up(&svc->srv_ctl_waitq);
 255         CDEBUG(D_NET, "svc exiting process %d\n", current->pid);
 256         return 0;
 257 }
 258
 259 void ptlrpc_stop_thread(struct ptlrpc_service *svc)
 260 {
 261         svc->srv_flags = SVC_STOPPING;
 262
 263         wake_up(&svc->srv_waitq);
 264         wait_event_interruptible(svc->srv_ctl_waitq,
 265                                  (svc->srv_flags & SVC_STOPPED));
 266 }
 267
 268 int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc,
 269                                 char *name)
 270 {
 271         struct ptlrpc_svc_data d;
 272         int rc;
 273         ENTRY;
 274
 275         d.dev = dev;
 276         d.svc = svc;
 277         d.name = name;
 278
 279         init_waitqueue_head(&svc->srv_waitq);
 280
 281         init_waitqueue_head(&svc->srv_ctl_waitq);
 282         rc = kernel_thread(ptlrpc_main, (void *) &d,
 283                            CLONE_VM | CLONE_FS | CLONE_FILES);
 284         if (rc < 0) {
 285                 CERROR("cannot start thread\n");
 286                 return -EINVAL;
 287         }
 288         wait_event(svc->srv_ctl_waitq, svc->srv_flags & SVC_RUNNING);
 289
 290         EXIT;
 291         return 0;
 292 }
 293
 294
 295
 296 int rpc_unregister_service(struct ptlrpc_service *service)
 297 {
 298         int rc, i;
 299
 300         for (i = 0; i < service->srv_ring_length; i++) {
 301                 if (service->srv_me_h[i]) {
 302                         rc = PtlMEUnlink(service->srv_me_h[i]);
 303                         if (rc)
 304                                 CERROR("PtlMEUnlink failed: %d\n", rc);
 305                         service->srv_me_h[i] = 0;
 306                 }
 307
 308                 if (service->srv_buf[i] != NULL)
 309                         OBD_FREE(service->srv_buf[i], service->srv_buf_size);
 310                 service->srv_buf[i] = NULL;
 311         }
 312
 313         rc = PtlEQFree(service->srv_eq_h);
 314         if (rc)
 315                 CERROR("PtlEQFree failed: %d\n", rc);
 316
 317         return 0;
 318 }