lustre/ptlrpc/niobuf.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 #define DEBUG_SUBSYSTEM S_RPC
  26
  27 #include <linux/lustre_net.h>
  28
  29 extern ptl_handle_eq_t request_out_eq,
  30         reply_in_eq,
  31         reply_out_eq,
  32         bulk_source_eq,
  33         bulk_sink_eq;
  34 static ptl_process_id_t local_id = {PTL_ID_ANY, PTL_ID_ANY};
  35
  36
  37 int ptlrpc_check_bulk_sent(struct ptlrpc_bulk_desc *bulk)
  38 {
  39         ENTRY;
  40
  41         if (bulk->b_flags & PTL_BULK_FL_SENT)
  42                 RETURN(1);
  43
  44         if (sigismember(&(current->pending.signal), SIGKILL) ||
  45             sigismember(&(current->pending.signal), SIGINT)) {
  46                 bulk->b_flags |= PTL_RPC_FL_INTR;
  47                 RETURN(1);
  48         }
  49
  50         CDEBUG(D_NET, "no event yet\n");
  51         RETURN(0);
  52 }
  53
  54 static int ptl_send_buf(struct ptlrpc_request *request,
  55                         struct ptlrpc_connection *conn, int portal)
  56 {
  57         int rc;
  58         ptl_process_id_t remote_id;
  59         ptl_handle_md_t md_h;
  60         ptl_ack_req_t ack;
  61
  62         request->rq_req_md.user_ptr = request;
  63
  64         switch (request->rq_type) {
  65         case PTL_RPC_TYPE_REQUEST:
  66                 request->rq_req_md.start = request->rq_reqmsg;
  67                 request->rq_req_md.length = request->rq_reqlen;
  68                 request->rq_req_md.eventq = request_out_eq;
  69                 request->rq_req_md.threshold = 1;
  70                 ack = PTL_NOACK_REQ;
  71                 break;
  72         case PTL_RPC_TYPE_REPLY:
  73                 request->rq_req_md.start = request->rq_repmsg;
  74                 request->rq_req_md.length = request->rq_replen;
  75                 request->rq_req_md.eventq = reply_out_eq;
  76                 request->rq_req_md.threshold = 1;
  77                 ack = PTL_NOACK_REQ;
  78                 break;
  79         default:
  80                 LBUG();
  81                 return -1; /* notreached */
  82         }
  83         request->rq_req_md.options = PTL_MD_OP_PUT;
  84         request->rq_req_md.user_ptr = request;
  85
  86         rc = PtlMDBind(conn->c_peer.peer_ni, request->rq_req_md, &md_h);
  87         //CERROR("MDBind (outgoing req/rep/bulk): %Lu\n", (__u64)md_h);
  88         if (rc != 0) {
  89                 CERROR("PtlMDBind failed: %d\n", rc);
  90                 LBUG();
  91                 return rc;
  92         }
  93
  94         remote_id.nid = conn->c_peer.peer_nid;
  95         remote_id.pid = 0;
  96
  97         CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %d\n",
  98                request->rq_req_md.length, portal, request->rq_reqmsg->xid);
  99
 100         rc = PtlPut(md_h, ack, remote_id, portal, 0, request->rq_reqmsg->xid,
 101                     0, 0);
 102         if (rc != PTL_OK) {
 103                 CERROR("PtlPut(%d, %d, %d) failed: %d\n", remote_id.nid,
 104                        portal, request->rq_reqmsg->xid, rc);
 105                 PtlMDUnlink(md_h);
 106         }
 107
 108         return rc;
 109 }
 110
 111 int ptlrpc_send_bulk(struct ptlrpc_bulk_desc *bulk, int portal)
 112 {
 113         int rc;
 114         ptl_process_id_t remote_id;
 115
 116         bulk->b_md.start = bulk->b_buf;
 117         bulk->b_md.length = bulk->b_buflen;
 118         bulk->b_md.eventq = bulk_source_eq;
 119         bulk->b_md.threshold = 2; /* SENT and ACK events */
 120         bulk->b_md.options = PTL_MD_OP_PUT;
 121         bulk->b_md.user_ptr = bulk;
 122
 123         rc = PtlMDBind(bulk->b_connection->c_peer.peer_ni, bulk->b_md,
 124                        &bulk->b_md_h);
 125         if (rc != 0) {
 126                 CERROR("PtlMDBind failed: %d\n", rc);
 127                 LBUG();
 128                 return rc;
 129         }
 130
 131         remote_id.nid = bulk->b_connection->c_peer.peer_nid;
 132         remote_id.pid = 0;
 133
 134         CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %d\n",
 135                bulk->b_md.length, portal, bulk->b_xid);
 136
 137         rc = PtlPut(bulk->b_md_h, PTL_ACK_REQ, remote_id, portal, 0,
 138                     bulk->b_xid, 0, 0);
 139         if (rc != PTL_OK) {
 140                 CERROR("PtlPut(%d, %d, %d) failed: %d\n", remote_id.nid,
 141                        portal, bulk->b_xid, rc);
 142                 PtlMDUnlink(bulk->b_md_h);
 143                 LBUG();
 144         }
 145
 146         return rc;
 147 }
 148
 149 int ptlrpc_register_bulk(struct ptlrpc_bulk_desc *bulk)
 150 {
 151         int rc;
 152         ENTRY;
 153
 154         rc = PtlMEAttach(bulk->b_connection->c_peer.peer_ni, bulk->b_portal,
 155                          local_id, bulk->b_xid, 0, PTL_UNLINK, PTL_INS_AFTER,
 156                          &bulk->b_me_h);
 157         if (rc != PTL_OK) {
 158                 CERROR("PtlMEAttach failed: %d\n", rc);
 159                 LBUG();
 160                 GOTO(cleanup, rc);
 161         }
 162
 163         bulk->b_md.start = bulk->b_buf;
 164         bulk->b_md.length = bulk->b_buflen;
 165         bulk->b_md.threshold = 1;
 166         bulk->b_md.options = PTL_MD_OP_PUT;
 167         bulk->b_md.user_ptr = bulk;
 168         bulk->b_md.eventq = bulk_sink_eq;
 169
 170         rc = PtlMDAttach(bulk->b_me_h, bulk->b_md, PTL_UNLINK, &bulk->b_md_h);
 171         //CERROR("MDAttach (bulk sink): %Lu\n", (__u64)bulk->b_md_h);
 172         if (rc != PTL_OK) {
 173                 CERROR("PtlMDAttach failed: %d\n", rc);
 174                 LBUG();
 175                 GOTO(cleanup, rc);
 176         }
 177
 178         CDEBUG(D_NET, "Setup bulk sink buffer: %u bytes, xid %u, portal %u\n",
 179                bulk->b_buflen, bulk->b_xid, bulk->b_portal);
 180         RETURN(0);
 181
 182         // XXX Confirm that this is safe!
 183  cleanup:
 184         PtlMEUnlink(bulk->b_me_h);
 185         return rc;
 186 }
 187
 188 int ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *bulk)
 189 {
 190         int rc;
 191
 192         rc = PtlMEUnlink(bulk->b_me_h);
 193         if (rc != PTL_OK)
 194                 CERROR("PtlMEUnlink failed: %d\n", rc);
 195
 196         return rc;
 197 }
 198
 199 int ptlrpc_reply(struct ptlrpc_service *svc, struct ptlrpc_request *req)
 200 {
 201         /* FIXME: we need to increment the count of handled events */
 202         req->rq_type = PTL_RPC_TYPE_REPLY;
 203         req->rq_repmsg->conn = req->rq_connection->c_remote_conn;
 204         req->rq_repmsg->token = req->rq_connection->c_remote_token;
 205         req->rq_repmsg->xid = HTON__u32(req->rq_reqmsg->xid);
 206         req->rq_repmsg->status = HTON__u32(req->rq_status);
 207         req->rq_reqmsg->type = HTON__u32(req->rq_type);
 208         return ptl_send_buf(req, req->rq_connection, svc->srv_rep_portal);
 209 }
 210
 211 int ptlrpc_error(struct ptlrpc_service *svc, struct ptlrpc_request *req)
 212 {
 213         int rc;
 214         ENTRY;
 215
 216         if (req->rq_repmsg) {
 217                 CERROR("req already has repmsg\n");
 218                 LBUG();
 219         }
 220
 221         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 222         if (rc)
 223                 RETURN(rc);
 224
 225         req->rq_repmsg->type = HTON__u32(PTL_RPC_MSG_ERR);
 226
 227         rc = ptlrpc_reply(svc, req);
 228         RETURN(rc);
 229 }
 230
 231 void ptlrpc_resend_req(struct ptlrpc_request *req)
 232 {
 233         ENTRY;
 234         req->rq_flags |= PTL_RPC_FL_RESEND;
 235         req->rq_flags &= ~PTL_RPC_FL_TIMEOUT;
 236         wake_up_interruptible(&req->rq_wait_for_rep);
 237         EXIT;
 238 }
 239
 240 int ptl_send_rpc(struct ptlrpc_request *request)
 241 {
 242         ptl_process_id_t local_id;
 243         int rc;
 244         char *repbuf;
 245
 246         ENTRY;
 247
 248         if (NTOH__u32(request->rq_reqmsg->type) != PTL_RPC_MSG_REQUEST) {
 249                 CERROR("wrong packet type sent %d\n",
 250                        NTOH__u32(request->rq_reqmsg->type));
 251                 LBUG();
 252                 RETURN(-EINVAL);
 253         }
 254         if (request->rq_replen == 0) {
 255                 CERROR("request->rq_replen is 0!\n");
 256                 RETURN(-EINVAL);
 257         }
 258
 259         /* request->rq_repmsg is set only when the reply comes in, in
 260          * client_packet_callback() */
 261         OBD_ALLOC(repbuf, request->rq_replen);
 262         if (!repbuf)
 263                 RETURN(-ENOMEM);
 264
 265         local_id.nid = PTL_ID_ANY;
 266         local_id.pid = PTL_ID_ANY;
 267
 268         down(&request->rq_client->cli_rpc_sem);
 269
 270         rc = PtlMEAttach(request->rq_connection->c_peer.peer_ni,
 271                          request->rq_client->cli_reply_portal,
 272                          local_id, request->rq_reqmsg->xid, 0, PTL_UNLINK,
 273                          PTL_INS_AFTER, &request->rq_reply_me_h);
 274         if (rc != PTL_OK) {
 275                 CERROR("PtlMEAttach failed: %d\n", rc);
 276                 LBUG();
 277                 GOTO(cleanup, rc);
 278         }
 279
 280         request->rq_type = PTL_RPC_TYPE_REQUEST;
 281         request->rq_reply_md.start = repbuf;
 282         request->rq_reply_md.length = request->rq_replen;
 283         request->rq_reply_md.threshold = 1;
 284         request->rq_reply_md.options = PTL_MD_OP_PUT;
 285         request->rq_reply_md.user_ptr = request;
 286         request->rq_reply_md.eventq = reply_in_eq;
 287
 288         rc = PtlMDAttach(request->rq_reply_me_h, request->rq_reply_md,
 289                          PTL_UNLINK, &request->rq_reply_md_h);
 290         if (rc != PTL_OK) {
 291                 CERROR("PtlMDAttach failed: %d\n", rc);
 292                 LBUG();
 293                 GOTO(cleanup2, rc);
 294         }
 295
 296         CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid %u, portal %u\n",
 297                request->rq_replen, request->rq_reqmsg->xid,
 298                request->rq_client->cli_reply_portal);
 299
 300         spin_lock(&request->rq_client->cli_lock);
 301         list_add(&request->rq_list, &request->rq_client->cli_sending_head);
 302         spin_unlock(&request->rq_client->cli_lock);
 303
 304         rc = ptl_send_buf(request, request->rq_connection,
 305                           request->rq_client->cli_request_portal);
 306         RETURN(rc);
 307
 308  cleanup2:
 309         PtlMEUnlink(request->rq_reply_me_h);
 310  cleanup:
 311         OBD_FREE(repbuf, request->rq_replen);
 312         up(&request->rq_client->cli_rpc_sem);
 313
 314         return rc;
 315 }
 316
 317 void ptlrpc_link_svc_me(struct ptlrpc_service *service, int i)
 318 {
 319         int rc;
 320         ptl_md_t dummy;
 321         ptl_handle_md_t md_h;
 322
 323         /* Attach the leading ME on which we build the ring */
 324         rc = PtlMEAttach(service->srv_self.peer_ni, service->srv_req_portal,
 325                          local_id, 0, ~0, PTL_RETAIN, PTL_INS_BEFORE,
 326                          &(service->srv_me_h[i]));
 327         if (rc != PTL_OK) {
 328                 CERROR("PtlMEAttach failed: %d\n", rc);
 329                 LBUG();
 330         }
 331
 332         if (service->srv_ref_count[i])
 333                 LBUG();
 334
 335         dummy.start         = service->srv_buf[i];
 336         dummy.length        = service->srv_buf_size;
 337         dummy.max_offset    = service->srv_buf_size;
 338         dummy.threshold     = PTL_MD_THRESH_INF;
 339         dummy.options       = PTL_MD_OP_PUT | PTL_MD_AUTO_UNLINK;
 340         dummy.user_ptr      = service;
 341         dummy.eventq        = service->srv_eq_h;
 342         dummy.max_offset    = service->srv_buf_size;
 343
 344         rc = PtlMDAttach(service->srv_me_h[i], dummy, PTL_UNLINK, &md_h);
 345         if (rc != PTL_OK) {
 346                 /* cleanup */
 347                 CERROR("PtlMDAttach failed: %d\n", rc);
 348                 LBUG();
 349         }
 350 }
 351
 352 /* ptl_handled_rpc() should be called by the sleeping process once
 353  * it finishes processing an event.  This ensures the ref count is
 354  * decremented and that the rpc ring buffer cycles properly.
 355  */
 356 int ptl_handled_rpc(struct ptlrpc_service *service, void *start)
 357 {
 358         int index;
 359
 360         spin_lock(&service->srv_lock);
 361
 362         for (index = 0; index < service->srv_ring_length; index++)
 363                 if (service->srv_buf[index] == start)
 364                         break;
 365
 366         if (index == service->srv_ring_length)
 367                 LBUG();
 368
 369         CDEBUG(D_INFO, "MD index=%d Ref Count=%d\n", index,
 370                service->srv_ref_count[index]);
 371         service->srv_ref_count[index]--;
 372
 373         if (service->srv_ref_count[index] < 0)
 374                 LBUG();
 375
 376         if (service->srv_ref_count[index] == 0 &&
 377             !ptl_is_valid_handle(&(service->srv_me_h[index]))) {
 378                 CDEBUG(D_NET, "relinking %d\n", index);
 379                 ptlrpc_link_svc_me(service, index);
 380         }
 381
 382         spin_unlock(&service->srv_lock);
 383         return 0;
 384 }