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