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
  37 static int ptlrpc_check_event(struct ptlrpc_service *svc)
  38 {
  39         if (sigismember(&(current->pending.signal), SIGKILL) ||
  40             sigismember(&(current->pending.signal), SIGINT)) {
  41                 svc->srv_flags |= SVC_KILLED;
  42                 EXIT;
  43                 return 1;
  44         }
  45
  46         if ( svc->srv_flags & SVC_STOPPING ) {
  47                 EXIT;
  48                 return 1;
  49         }
  50
  51         if (svc->srv_flags & SVC_EVENT)
  52                 BUG();
  53
  54         if ( svc->srv_eq_h ) {
  55                 int rc;
  56                 rc = PtlEQGet(svc->srv_eq_h, &svc->srv_ev);
  57
  58                 if (rc == PTL_OK) {
  59                         svc->srv_flags |= SVC_EVENT;
  60                         EXIT;
  61                         return 1;
  62                 }
  63
  64                 if (rc != PTL_EQ_EMPTY) {
  65                         CDEBUG(D_NET, "BUG: PtlEQGet returned %d\n", rc);
  66                         BUG();
  67                 }
  68
  69                 EXIT;
  70                 return 0;
  71         }
  72
  73         if (!list_empty(&svc->srv_reqs)) {
  74                 svc->srv_flags |= SVC_LIST;
  75                 EXIT;
  76                 return 1;
  77         }
  78
  79         EXIT;
  80         return 0;
  81 }
  82
  83 struct ptlrpc_service *
  84 ptlrpc_init_svc(__u32 bufsize, int req_portal, int rep_portal, char *uuid,
  85                 req_unpack_t unpack, rep_pack_t pack, svc_handler_t handler)
  86 {
  87         int err;
  88         struct ptlrpc_service *svc;
  89
  90         OBD_ALLOC(svc, sizeof(*svc));
  91         if ( !svc ) {
  92                 CERROR("no memory\n");
  93                 return NULL;
  94         }
  95
  96         memset(svc, 0, sizeof(*svc));
  97
  98         spin_lock_init(&svc->srv_lock);
  99         INIT_LIST_HEAD(&svc->srv_reqs);
 100         init_waitqueue_head(&svc->srv_ctl_waitq);
 101         init_waitqueue_head(&svc->srv_waitq);
 102
 103         svc->srv_thread = NULL;
 104         svc->srv_flags = 0;
 105
 106         svc->srv_buf_size = bufsize;
 107         svc->srv_rep_portal = rep_portal;
 108         svc->srv_req_portal = req_portal;
 109         svc->srv_req_unpack = unpack;
 110         svc->srv_rep_pack = pack;
 111         svc->srv_handler = handler;
 112         err = kportal_uuid_to_peer(uuid, &svc->srv_self);
 113         if (err) {
 114                 CERROR("cannot get peer for uuid %s", uuid);
 115                 OBD_FREE(svc, sizeof(*svc));
 116                 return NULL;
 117         }
 118         return svc;
 119 }
 120
 121 static int ptlrpc_main(void *arg)
 122 {
 123         int rc;
 124         struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
 125         struct obd_device *obddev = data->dev;
 126         struct ptlrpc_service *svc = data->svc;
 127
 128         ENTRY;
 129
 130         lock_kernel();
 131         daemonize();
 132         spin_lock_irq(&current->sigmask_lock);
 133         sigfillset(&current->blocked);
 134         recalc_sigpending(current);
 135         spin_unlock_irq(&current->sigmask_lock);
 136
 137         sprintf(current->comm, data->name);
 138
 139         /* Record that the  thread is running */
 140         svc->srv_thread = current;
 141         svc->srv_flags = SVC_RUNNING;
 142         wake_up(&svc->srv_ctl_waitq);
 143
 144         /* XXX maintain a list of all managed devices: insert here */
 145
 146         /* And now, loop forever on requests */
 147         while (1) {
 148                 wait_event(svc->srv_waitq, ptlrpc_check_event(svc));
 149
 150                 if (svc->srv_flags & SVC_SIGNAL) {
 151                         EXIT;
 152                         break;
 153                 }
 154
 155                 if (svc->srv_flags & SVC_STOPPING) {
 156                         EXIT;
 157                         break;
 158                 }
 159
 160                 if (svc->srv_flags & SVC_EVENT) {
 161                         struct ptlrpc_request request;
 162                         svc->srv_flags = SVC_RUNNING;
 163
 164                         /* FIXME: If we move to an event-driven model,
 165                          * we should put the request on the stack of
 166                          * mds_handle instead. */
 167                         memset(&request, 0, sizeof(request));
 168                         request.rq_obd = obddev;
 169                         request.rq_reqbuf = (svc->srv_ev.mem_desc.start +
 170                                              svc->srv_ev.offset);
 171                         request.rq_reqlen = svc->srv_ev.mem_desc.length;
 172                         request.rq_xid = svc->srv_ev.match_bits;
 173                         CDEBUG(D_NET, "got req %d\n", request.rq_xid);
 174
 175                         request.rq_peer.peer_nid = svc->srv_ev.initiator.nid;
 176                         /* FIXME: this NI should be the incoming NI.
 177                          * We don't know how to find that from here. */
 178                         request.rq_peer.peer_ni = svc->srv_self.peer_ni;
 179                         rc = svc->srv_handler(obddev, svc, &request);
 180                         ptl_received_rpc(svc);
 181                         svc->srv_flags &= ~SVC_EVENT;
 182                         continue;
 183                 }
 184
 185                 if (svc->srv_flags & SVC_LIST) {
 186                         struct ptlrpc_request *request;
 187                         svc->srv_flags = SVC_RUNNING;
 188
 189                         spin_lock(&svc->srv_lock);
 190                         request = list_entry(svc->srv_reqs.next,
 191                                              struct ptlrpc_request,
 192                                              rq_list);
 193                         list_del(&request->rq_list);
 194                         spin_unlock(&svc->srv_lock);
 195                         rc = svc->srv_handler(obddev, svc, request);
 196                         continue;
 197                 }
 198                 CERROR("unknown break in service");
 199                 break;
 200         }
 201
 202         svc->srv_thread = NULL;
 203         svc->srv_flags = SVC_STOPPED;
 204         wake_up(&svc->srv_ctl_waitq);
 205         CDEBUG(D_NET, "svc exiting process %d\n", current->pid);
 206         return 0;
 207 }
 208
 209 void ptlrpc_stop_thread(struct ptlrpc_service *svc)
 210 {
 211         svc->srv_flags = SVC_STOPPING;
 212
 213         wake_up(&svc->srv_waitq);
 214         wait_event_interruptible(svc->srv_ctl_waitq,
 215                                  (svc->srv_flags & SVC_STOPPED));
 216 }
 217
 218 int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc,
 219                                 char *name)
 220 {
 221         struct ptlrpc_svc_data d;
 222         int rc;
 223         ENTRY;
 224
 225         d.dev = dev;
 226         d.svc = svc;
 227         d.name = name;
 228
 229         init_waitqueue_head(&svc->srv_waitq);
 230
 231         init_waitqueue_head(&svc->srv_ctl_waitq);
 232         rc = kernel_thread(ptlrpc_main, (void *) &d,
 233                            CLONE_VM | CLONE_FS | CLONE_FILES);
 234         if (rc < 0) {
 235                 CERROR("cannot start thread\n");
 236                 return -EINVAL;
 237         }
 238         wait_event(svc->srv_ctl_waitq, svc->srv_flags & SVC_RUNNING);
 239
 240         EXIT;
 241         return 0;
 242 }
 243
 244
 245 int rpc_register_service(struct ptlrpc_service *service, char *uuid)
 246 {
 247         struct lustre_peer peer;
 248         int rc, i;
 249
 250         rc = kportal_uuid_to_peer(uuid, &peer);
 251         if (rc != 0) {
 252                 CERROR("Invalid uuid \"%s\"\n", uuid);
 253                 return -EINVAL;
 254         }
 255
 256         service->srv_ring_length = RPC_RING_LENGTH;
 257         service->srv_me_active = 0;
 258         service->srv_md_active = 0;
 259
 260         service->srv_id.addr_kind = PTL_ADDR_GID;
 261         service->srv_id.gid = PTL_ID_ANY;
 262         service->srv_id.rid = PTL_ID_ANY;
 263
 264         rc = PtlEQAlloc(peer.peer_ni, 128, server_request_callback,
 265                         service, &(service->srv_eq_h));
 266
 267         if (rc != PTL_OK) {
 268                 CERROR("PtlEQAlloc failed: %d\n", rc);
 269                 return rc;
 270         }
 271
 272         CDEBUG(D_NET, "Starting service listening on portal %d\n",
 273                service->srv_req_portal);
 274
 275         /* Attach the leading ME on which we build the ring */
 276         rc = PtlMEAttach(peer.peer_ni, service->srv_req_portal,
 277                          service->srv_id, 0, ~0, PTL_RETAIN,
 278                          &(service->srv_me_h[0]));
 279
 280         if (rc != PTL_OK) {
 281                 CERROR("PtlMEAttach failed: %d\n", rc);
 282                 return rc;
 283         }
 284
 285         for (i = 0; i < service->srv_ring_length; i++) {
 286                 OBD_ALLOC(service->srv_buf[i], service->srv_buf_size);
 287
 288                 if (service->srv_buf[i] == NULL) {
 289                         CERROR("no memory\n");
 290                         return -ENOMEM;
 291                 }
 292
 293                 /* Insert additional ME's to the ring */
 294                 if (i > 0) {
 295                         rc = PtlMEInsert(service->srv_me_h[i-1],
 296                                          service->srv_id, 0, ~0, PTL_RETAIN,
 297                                          PTL_INS_AFTER,&(service->srv_me_h[i]));
 298                         service->srv_me_tail = i;
 299
 300                         if (rc != PTL_OK) {
 301                                 CERROR("PtlMEInsert failed: %d\n", rc);
 302                                 return rc;
 303                         }
 304                 }
 305
 306                 service->srv_ref_count[i] = 0;
 307                 service->srv_md[i].start         = service->srv_buf[i];
 308                 service->srv_md[i].length        = service->srv_buf_size;
 309                 service->srv_md[i].max_offset    = service->srv_buf_size;
 310                 service->srv_md[i].threshold     = PTL_MD_THRESH_INF;
 311                 service->srv_md[i].options       = PTL_MD_OP_PUT;
 312                 service->srv_md[i].user_ptr      = service;
 313                 service->srv_md[i].eventq        = service->srv_eq_h;
 314                 service->srv_md[i].max_offset    = service->srv_buf_size;
 315
 316                 rc = PtlMDAttach(service->srv_me_h[i], service->srv_md[i],
 317                                  PTL_RETAIN, &(service->srv_md_h[i]));
 318
 319                 if (rc != PTL_OK) {
 320                         /* cleanup */
 321                         CERROR("PtlMDAttach failed: %d\n", rc);
 322                         return rc;
 323                 }
 324         }
 325
 326         return 0;
 327 }
 328
 329 int rpc_unregister_service(struct ptlrpc_service *service)
 330 {
 331         int rc, i;
 332
 333         for (i = 0; i < service->srv_ring_length; i++) {
 334                 rc = PtlMDUnlink(service->srv_md_h[i]);
 335                 if (rc)
 336                         CERROR("PtlMDUnlink failed: %d\n", rc);
 337
 338                 rc = PtlMEUnlink(service->srv_me_h[i]);
 339                 if (rc)
 340                         CERROR("PtlMEUnlink failed: %d\n", rc);
 341
 342                 if (service->srv_buf[i] != NULL)
 343                         OBD_FREE(service->srv_buf[i], service->srv_buf_size);
 344                 service->srv_buf[i] = NULL;
 345         }
 346
 347         rc = PtlEQFree(service->srv_eq_h);
 348         if (rc)
 349                 CERROR("PtlEQFree failed: %d\n", rc);
 350
 351         return 0;
 352 }