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 {
  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                 svc->srv_flags |= SVC_KILLED;
  41                 GOTO(out, rc = 1);
  42         }
  43
  44         if (svc->srv_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, &svc->srv_ev);
  50
  51                 if (err == PTL_OK) {
  52                         svc->srv_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_waitqueue_head(&service->srv_ctl_waitq);
  88         init_waitqueue_head(&service->srv_waitq);
  89
  90         service->srv_thread = NULL;
  91         service->srv_flags = 0;
  92
  93         service->srv_buf_size = bufsize;
  94         service->srv_rep_portal = rep_portal;
  95         service->srv_req_portal = req_portal;
  96         service->srv_handler = handler;
  97
  98         err = kportal_uuid_to_peer(uuid, &service->srv_self);
  99         if (err) {
 100                 CERROR("cannot get peer for uuid %s", uuid);
 101                 GOTO(err_free, NULL);
 102         }
 103
 104         service->srv_ring_length = RPC_RING_LENGTH;
 105         service->srv_id.nid = PTL_ID_ANY;
 106         service->srv_id.pid = PTL_ID_ANY;
 107
 108         rc = PtlEQAlloc(service->srv_self.peer_ni, 128, request_in_callback,
 109                         service, &(service->srv_eq_h));
 110
 111         if (rc != PTL_OK) {
 112                 CERROR("PtlEQAlloc failed: %d\n", rc);
 113                 LBUG();
 114                 GOTO(err_free, NULL);
 115         }
 116
 117         for (i = 0; i < service->srv_ring_length; i++) {
 118                 OBD_ALLOC(service->srv_buf[i], service->srv_buf_size);
 119                 if (service->srv_buf[i] == NULL) {
 120                         CERROR("no memory\n");
 121                         LBUG();
 122                         GOTO(err_ring, NULL);
 123                 }
 124                 service->srv_ref_count[i] = 0;
 125                 ptlrpc_link_svc_me(service, i);
 126         }
 127
 128         CDEBUG(D_NET, "Starting service listening on portal %d\n",
 129                service->srv_req_portal);
 130
 131         RETURN(service);
 132 err_ring:
 133         service->srv_ring_length = i;
 134         rpc_unregister_service(service); // XXX verify this is right
 135         PtlEQFree(service->srv_eq_h);
 136 err_free:
 137         OBD_FREE(service, sizeof(*service));
 138         return NULL;
 139 }
 140
 141 static int handle_incoming_request(struct obd_device *obddev,
 142                                    struct ptlrpc_service *svc)
 143 {
 144         struct ptlrpc_request request;
 145         struct lustre_peer peer;
 146         void *start;
 147         int rc;
 148
 149         /* FIXME: If we move to an event-driven model, we should put the request
 150          * on the stack of mds_handle instead. */
 151         start = svc->srv_ev.mem_desc.start;
 152         memset(&request, 0, sizeof(request));
 153         request.rq_obd = obddev;
 154         request.rq_reqmsg = (svc->srv_ev.mem_desc.start +
 155                              svc->srv_ev.offset);
 156         request.rq_reqlen = svc->srv_ev.mem_desc.length;
 157
 158         if (request.rq_reqmsg->xid != svc->srv_ev.match_bits)
 159                 LBUG();
 160
 161         CDEBUG(D_NET, "got req %d\n", request.rq_reqmsg->xid);
 162
 163         peer.peer_nid = svc->srv_ev.initiator.nid;
 164         /* FIXME: this NI should be the incoming NI.
 165          * We don't know how to find that from here. */
 166         peer.peer_ni = svc->srv_self.peer_ni;
 167
 168         if (request.rq_reqmsg->conn) {
 169                 request.rq_connection =
 170                         (void *)(unsigned long)request.rq_reqmsg->conn;
 171                 if (request.rq_reqmsg->token != request.rq_connection->c_token)
 172                         LBUG();
 173                 ptlrpc_connection_addref(request.rq_connection);
 174         } else {
 175                 request.rq_connection = ptlrpc_get_connection(&peer);
 176                 if (!request.rq_connection)
 177                         LBUG();
 178         }
 179
 180         svc->srv_flags &= ~SVC_EVENT;
 181
 182         spin_unlock(&svc->srv_lock);
 183         rc = svc->srv_handler(obddev, svc, &request);
 184         ptlrpc_put_connection(request.rq_connection);
 185         ptl_handled_rpc(svc, start);
 186         return rc;
 187 }
 188
 189 static int ptlrpc_main(void *arg)
 190 {
 191         int rc;
 192         struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
 193         struct obd_device *obddev = data->dev;
 194         struct ptlrpc_service *svc = data->svc;
 195
 196         ENTRY;
 197
 198         lock_kernel();
 199         daemonize();
 200         spin_lock_irq(&current->sigmask_lock);
 201         sigfillset(&current->blocked);
 202         recalc_sigpending(current);
 203         spin_unlock_irq(&current->sigmask_lock);
 204
 205         sprintf(current->comm, data->name);
 206
 207         /* Record that the  thread is running */
 208         svc->srv_thread = current;
 209         svc->srv_flags = SVC_RUNNING;
 210         wake_up(&svc->srv_ctl_waitq);
 211
 212         /* XXX maintain a list of all managed devices: insert here */
 213
 214         /* And now, loop forever on requests */
 215         while (1) {
 216                 wait_event(svc->srv_waitq, ptlrpc_check_event(svc));
 217
 218                 spin_lock(&svc->srv_lock);
 219                 if (svc->srv_flags & SVC_SIGNAL) {
 220                         svc->srv_flags &= ~SVC_SIGNAL;
 221                         spin_unlock(&svc->srv_lock);
 222                         EXIT;
 223                         break;
 224                 }
 225
 226                 if (svc->srv_flags & SVC_STOPPING) {
 227                         svc->srv_flags &= ~SVC_STOPPING;
 228                         spin_unlock(&svc->srv_lock);
 229                         EXIT;
 230                         break;
 231                 }
 232
 233                 if (svc->srv_flags & SVC_EVENT) {
 234                         svc->srv_flags &= ~SVC_EVENT;
 235                         rc = handle_incoming_request(obddev, svc);
 236                         continue;
 237                 }
 238
 239                 CERROR("unknown break in service");
 240                 spin_unlock(&svc->srv_lock);
 241                 EXIT;
 242                 break;
 243         }
 244
 245         svc->srv_thread = NULL;
 246         svc->srv_flags = SVC_STOPPED;
 247         wake_up(&svc->srv_ctl_waitq);
 248         CDEBUG(D_NET, "svc exiting process %d\n", current->pid);
 249         return 0;
 250 }
 251
 252 void ptlrpc_stop_thread(struct ptlrpc_service *svc)
 253 {
 254         svc->srv_flags = SVC_STOPPING;
 255
 256         wake_up(&svc->srv_waitq);
 257         wait_event_interruptible(svc->srv_ctl_waitq,
 258                                  (svc->srv_flags & SVC_STOPPED));
 259 }
 260
 261 int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc,
 262                                 char *name)
 263 {
 264         struct ptlrpc_svc_data d;
 265         int rc;
 266         ENTRY;
 267
 268         d.dev = dev;
 269         d.svc = svc;
 270         d.name = name;
 271
 272         init_waitqueue_head(&svc->srv_waitq);
 273
 274         init_waitqueue_head(&svc->srv_ctl_waitq);
 275         rc = kernel_thread(ptlrpc_main, (void *) &d,
 276                            CLONE_VM | CLONE_FS | CLONE_FILES);
 277         if (rc < 0) {
 278                 CERROR("cannot start thread\n");
 279                 RETURN(-EINVAL);
 280         }
 281         wait_event(svc->srv_ctl_waitq, svc->srv_flags & SVC_RUNNING);
 282
 283         RETURN(0);
 284 }
 285
 286 int rpc_unregister_service(struct ptlrpc_service *service)
 287 {
 288         int rc, i;
 289
 290         for (i = 0; i < service->srv_ring_length; i++) {
 291                 if (ptl_is_valid_handle(&(service->srv_me_h[i]))) {
 292                         rc = PtlMEUnlink(service->srv_me_h[i]);
 293                         if (rc)
 294                                 CERROR("PtlMEUnlink failed: %d\n", rc);
 295                         ptl_set_inv_handle(&(service->srv_me_h[i]));
 296                 }
 297
 298                 if (service->srv_buf[i] != NULL)
 299                         OBD_FREE(service->srv_buf[i], service->srv_buf_size);
 300                 service->srv_buf[i] = NULL;
 301         }
 302
 303         rc = PtlEQFree(service->srv_eq_h);
 304         if (rc)
 305                 CERROR("PtlEQFree failed: %d\n", rc);
 306
 307         return 0;
 308 }