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