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),
  41                         SIGKILL) ||
  42             sigismember(&(current->pending.signal),
  43                         SIGINT)) {
  44                 svc->srv_flags |= SVC_KILLED;
  45                 EXIT;
  46                 return 1;
  47         }
  48
  49         if ( svc->srv_flags & SVC_STOPPING ) {
  50                 EXIT;
  51                 return 1;
  52         }
  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_DROPPED) {
  65                         CERROR("dropped event!\n");
  66                         BUG();
  67                 }
  68                 CERROR("PtlEQGet returns %d\n", rc);
  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 *ptlrpc_init_svc(__u32 bufsize,
  84                                        int portal,
  85                                        char *uuid,
  86                                        req_unpack_t unpack,
  87                                        rep_pack_t pack,
  88                                        svc_handler_t handler
  89                                        )
  90 {
  91         int err;
  92         struct ptlrpc_service *svc;
  93
  94         OBD_ALLOC(svc, sizeof(*svc));
  95         if ( !svc ) {
  96                 CERROR("no memory\n");
  97                 return NULL;
  98         }
  99
 100         memset(svc, 0, sizeof(*svc));
 101
 102         spin_lock_init(&svc->srv_lock);
 103         INIT_LIST_HEAD(&svc->srv_reqs);
 104         init_waitqueue_head(&svc->srv_ctl_waitq);
 105         init_waitqueue_head(&svc->srv_waitq);
 106
 107         svc->srv_thread = NULL;
 108         svc->srv_flags = 0;
 109
 110         svc->srv_buf_size = bufsize;
 111         svc->srv_portal = portal;
 112         svc->srv_req_unpack = unpack;
 113         svc->srv_rep_pack = pack;
 114         svc->srv_handler = handler;
 115         err = kportal_uuid_to_peer(uuid, &svc->srv_self);
 116         if (err) {
 117                 CERROR("cannot get peer for uuid %s", uuid);
 118                 OBD_FREE(svc, sizeof(*svc));
 119                 return NULL;
 120         }
 121         return svc;
 122 }
 123
 124 static int ptlrpc_main(void *arg)
 125 {
 126         int rc;
 127         struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
 128         struct obd_device *obddev = data->dev;
 129         struct ptlrpc_service *svc = data->svc;
 130
 131         ENTRY;
 132
 133         lock_kernel();
 134         daemonize();
 135         spin_lock_irq(&current->sigmask_lock);
 136         sigfillset(&current->blocked);
 137         recalc_sigpending(current);
 138         spin_unlock_irq(&current->sigmask_lock);
 139
 140         sprintf(current->comm, data->name);
 141
 142         /* Record that the  thread is running */
 143         svc->srv_thread = current;
 144         svc->srv_flags = SVC_RUNNING;
 145         wake_up(&svc->srv_ctl_waitq);
 146
 147         /* XXX maintain a list of all managed devices: insert here */
 148
 149         /* And now, loop forever on requests */
 150         while (1) {
 151
 152                 wait_event(svc->srv_waitq, ptlrpc_check_event(svc));
 153
 154                 if (svc->srv_flags & SVC_SIGNAL) {
 155                         EXIT;
 156                         break;
 157                 }
 158
 159                 if (svc->srv_flags & SVC_STOPPING) {
 160                         EXIT;
 161                         break;
 162                 }
 163
 164                 if (svc->srv_flags & SVC_EVENT) {
 165                         struct ptlrpc_request request;
 166                         svc->srv_flags = SVC_RUNNING;
 167
 168                         /* FIXME: If we move to an event-driven model,
 169                          * we should put the request on the stack of
 170                          * mds_handle instead. */
 171                         memset(&request, 0, sizeof(request));
 172                         request.rq_reqbuf = svc->srv_ev.mem_desc.start + svc->srv_ev.offset;
 173                         request.rq_reqlen = svc->srv_ev.mem_desc.length;
 174                         request.rq_xid = svc->srv_ev.match_bits;
 175                         CERROR("got req %d\n", request.rq_xid);
 176
 177                         request.rq_peer.peer_nid = svc->srv_ev.initiator.nid;
 178                         /* FIXME: this NI should be the incoming NI.
 179                          * We don't know how to find that from here. */
 180                         request.rq_peer.peer_ni = svc->srv_self.peer_ni;
 181                         rc = svc->srv_handler(obddev, svc, &request);
 182                         ptl_received_rpc(svc);
 183                         continue;
 184                 }
 185
 186                 if (svc->srv_flags & SVC_LIST) {
 187                         struct ptlrpc_request *request;
 188                         svc->srv_flags = SVC_RUNNING;
 189
 190                         spin_lock(&svc->srv_lock);
 191                         request = list_entry(svc->srv_reqs.next,
 192                                              struct ptlrpc_request,
 193                                              rq_list);
 194                         list_del(&request->rq_list);
 195                         spin_unlock(&svc->srv_lock);
 196                         rc = svc->srv_handler(obddev, svc, request);
 197                         continue;
 198                 }
 199                 CERROR("unknown break in service");
 200                 break;
 201         }
 202
 203         svc->srv_thread = NULL;
 204         svc->srv_flags = SVC_STOPPED;
 205         wake_up(&svc->srv_ctl_waitq);
 206         CERROR("svc %s: exiting\n", data->name);
 207         return 0;
 208 }
 209
 210 void ptlrpc_stop_thread(struct ptlrpc_service *svc)
 211 {
 212         svc->srv_flags = SVC_STOPPING;
 213
 214         wake_up(&svc->srv_waitq);
 215         wait_event_interruptible(svc->srv_ctl_waitq,  (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         /* Attach the leading ME on which we build the ring */
 273         rc = PtlMEAttach(peer.peer_ni, service->srv_portal,
 274                          service->srv_id, 0, ~0, PTL_RETAIN,
 275                          &(service->srv_me_h[0]));
 276
 277         if (rc != PTL_OK) {
 278                 CERROR("PtlMEAttach failed: %d\n", rc);
 279                 return rc;
 280         }
 281
 282         for (i = 0; i < service->srv_ring_length; i++) {
 283                 OBD_ALLOC(service->srv_buf[i], service->srv_buf_size);
 284
 285                 if (service->srv_buf[i] == NULL) {
 286                         CERROR("no memory\n");
 287                         return -ENOMEM;
 288                 }
 289
 290                 /* Insert additional ME's to the ring */
 291                 if (i > 0) {
 292                         rc = PtlMEInsert(service->srv_me_h[i-1],
 293                                          service->srv_id, 0, ~0, PTL_RETAIN,
 294                                          PTL_INS_AFTER,&(service->srv_me_h[i]));
 295                         service->srv_me_tail = i;
 296
 297                         if (rc != PTL_OK) {
 298                                 CERROR("PtlMEInsert failed: %d\n", rc);
 299                                 return rc;
 300                         }
 301                 }
 302
 303                 service->srv_ref_count[i] = 0;
 304                 service->srv_md[i].start        = service->srv_buf[i];
 305                 service->srv_md[i].length        = service->srv_buf_size;
 306                 service->srv_md[i].threshold        = PTL_MD_THRESH_INF;
 307                 service->srv_md[i].options        = PTL_MD_OP_PUT;
 308                 service->srv_md[i].user_ptr        = service;
 309                 service->srv_md[i].eventq        = service->srv_eq_h;
 310
 311                 rc = PtlMDAttach(service->srv_me_h[i], service->srv_md[i],
 312                                  PTL_RETAIN, &(service->srv_md_h[i]));
 313
 314                 if (rc != PTL_OK) {
 315                         /* cleanup */
 316                         CERROR("PtlMDAttach failed: %d\n", rc);
 317                         return rc;
 318                 }
 319         }
 320
 321         return 0;
 322 }
 323
 324 int rpc_unregister_service(struct ptlrpc_service *service)
 325 {
 326         int rc, i;
 327
 328         for (i = 0; i < service->srv_ring_length; i++) {
 329                 rc = PtlMDUnlink(service->srv_md_h[i]);
 330                 if (rc)
 331                         CERROR("PtlMDUnlink failed: %d\n", rc);
 332
 333                 rc = PtlMEUnlink(service->srv_me_h[i]);
 334                 if (rc)
 335                         CERROR("PtlMEUnlink failed: %d\n", rc);
 336
 337                 OBD_FREE(service->srv_buf[i], service->srv_buf_size);
 338         }
 339
 340         rc = PtlEQFree(service->srv_eq_h);
 341         if (rc)
 342                 CERROR("PtlEQFree failed: %d\n", rc);
 343
 344         return 0;
 345 }
 346