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 DEBUG_SUBSYSTEM S_RPC
  24
  25 #include <linux/obd_support.h>
  26 #include <linux/lustre_net.h>
  27 #include <linux/lustre_lib.h>
  28
  29 extern ptl_handle_eq_t request_out_eq, reply_in_eq, reply_out_eq,
  30         bulk_source_eq, bulk_sink_eq;
  31 static ptl_process_id_t local_id = {PTL_NID_ANY, PTL_PID_ANY};
  32
  33 static int ptl_send_buf(struct ptlrpc_request *request,
  34                         struct ptlrpc_connection *conn, int portal)
  35 {
  36         int rc;
  37         ptl_process_id_t remote_id;
  38         ptl_handle_md_t md_h;
  39         ptl_ack_req_t ack;
  40
  41         request->rq_req_md.user_ptr = request;
  42
  43         switch (request->rq_type) {
  44         case PTL_RPC_TYPE_REQUEST:
  45                 request->rq_req_md.start = request->rq_reqmsg;
  46                 request->rq_req_md.length = request->rq_reqlen;
  47                 request->rq_req_md.eventq = request_out_eq;
  48                 request->rq_req_md.threshold = 1;
  49                 ack = PTL_NOACK_REQ;
  50                 break;
  51         case PTL_RPC_TYPE_REPLY:
  52                 request->rq_req_md.start = request->rq_repmsg;
  53                 request->rq_req_md.length = request->rq_replen;
  54                 request->rq_req_md.eventq = reply_out_eq;
  55                 request->rq_req_md.threshold = 1;
  56                 ack = PTL_NOACK_REQ;
  57                 break;
  58         default:
  59                 LBUG();
  60                 return -1; /* notreached */
  61         }
  62         request->rq_req_md.options = PTL_MD_OP_PUT;
  63         request->rq_req_md.user_ptr = request;
  64
  65         rc = PtlMDBind(conn->c_peer.peer_ni, request->rq_req_md, &md_h);
  66         //CERROR("MDBind (outgoing req/rep/bulk): %Lu\n", (__u64)md_h);
  67         if (rc != 0) {
  68                 CERROR("PtlMDBind failed: %d\n", rc);
  69                 LBUG();
  70                 return rc;
  71         }
  72
  73         remote_id.nid = conn->c_peer.peer_nid;
  74         remote_id.pid = 0;
  75
  76         CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %Ld\n",
  77                request->rq_req_md.length, portal, request->rq_xid);
  78
  79         rc = PtlPut(md_h, ack, remote_id, portal, 0, request->rq_xid,
  80                     0, 0);
  81         if (rc != PTL_OK) {
  82                 CERROR("PtlPut(%Lu, %d, %Ld) failed: %d\n", remote_id.nid,
  83                        portal, request->rq_xid, rc);
  84                 PtlMDUnlink(md_h);
  85         }
  86
  87         return rc;
  88 }
  89
  90 static inline struct iovec *
  91 ptlrpc_get_bulk_iov (struct ptlrpc_bulk_desc *desc)
  92 {
  93         struct iovec *iov;
  94
  95         if (desc->bd_page_count <= sizeof (desc->bd_iov)/sizeof (struct iovec))
  96                 return (desc->bd_iov);
  97
  98         OBD_ALLOC (iov, desc->bd_page_count * sizeof (struct iovec));
  99         if (iov == NULL)
 100                 LBUG();
 101
 102         return (iov);
 103 }
 104
 105 static inline void
 106 ptlrpc_put_bulk_iov (struct ptlrpc_bulk_desc *desc, struct iovec *iov)
 107 {
 108         if (desc->bd_page_count <= sizeof (desc->bd_iov)/sizeof (struct iovec))
 109                 return;
 110
 111         OBD_FREE (iov, desc->bd_page_count * sizeof (struct iovec));
 112 }
 113
 114 int ptlrpc_send_bulk(struct ptlrpc_bulk_desc *desc)
 115 {
 116         int rc;
 117         struct list_head *tmp, *next;
 118         ptl_process_id_t remote_id;
 119         __u32 xid = 0;
 120         struct iovec *iov;
 121         ENTRY;
 122
 123         iov = ptlrpc_get_bulk_iov (desc);
 124         if (iov == NULL)
 125                 RETURN (-ENOMEM);
 126
 127         desc->bd_md.start = iov;
 128         desc->bd_md.niov = 0;
 129         desc->bd_md.length = 0;
 130         desc->bd_md.eventq = bulk_source_eq;
 131         desc->bd_md.threshold = 2; /* SENT and ACK */
 132         desc->bd_md.options = PTL_MD_OP_PUT | PTL_MD_IOV;
 133         desc->bd_md.user_ptr = desc;
 134
 135         list_for_each_safe(tmp, next, &desc->bd_page_list) {
 136                 struct ptlrpc_bulk_page *bulk;
 137                 bulk = list_entry(tmp, struct ptlrpc_bulk_page, bp_link);
 138
 139                 LASSERT (desc->bd_md.niov < desc->bd_page_count);
 140
 141                 if (desc->bd_md.niov == 0)
 142                         xid = bulk->bp_xid;
 143                 LASSERT (xid == bulk->bp_xid);   /* should all be the same */
 144
 145                 iov[desc->bd_md.niov].iov_base = bulk->bp_buf;
 146                 iov[desc->bd_md.niov].iov_len = bulk->bp_buflen;
 147                 desc->bd_md.niov++;
 148                 desc->bd_md.length += bulk->bp_buflen;
 149         }
 150
 151         LASSERT (desc->bd_md.niov == desc->bd_page_count);
 152         LASSERT (desc->bd_md.niov != 0);
 153
 154         rc = PtlMDBind(desc->bd_connection->c_peer.peer_ni, desc->bd_md,
 155                        &desc->bd_md_h);
 156
 157         ptlrpc_put_bulk_iov (desc, iov);        /* move down to reduce latency to send */
 158
 159         if (rc != PTL_OK) {
 160                 CERROR("PtlMDBind failed: %d\n", rc);
 161                 LBUG();
 162                 RETURN(rc);
 163         }
 164
 165         remote_id.nid = desc->bd_connection->c_peer.peer_nid;
 166         remote_id.pid = 0;
 167
 168         CDEBUG(D_NET, "Sending %u pages %u bytes to portal %d nid %Lx pid %d xid %d\n",
 169                desc->bd_md.niov, desc->bd_md.length,
 170                desc->bd_portal, remote_id.nid, remote_id.pid, xid);
 171
 172         rc = PtlPut(desc->bd_md_h, PTL_ACK_REQ, remote_id,
 173                     desc->bd_portal, 0, xid, 0, 0);
 174         if (rc != PTL_OK) {
 175                 CERROR("PtlPut(%Lu, %d, %d) failed: %d\n",
 176                        remote_id.nid, desc->bd_portal, xid, rc);
 177                 PtlMDUnlink(desc->bd_md_h);
 178                 LBUG();
 179                 RETURN(rc);
 180         }
 181
 182         RETURN(0);
 183 }
 184
 185 int ptlrpc_register_bulk(struct ptlrpc_bulk_desc *desc)
 186 {
 187         struct list_head *tmp, *next;
 188         int rc;
 189         __u32 xid = 0;
 190         struct iovec *iov;
 191         ENTRY;
 192
 193         iov = ptlrpc_get_bulk_iov (desc);
 194         if (iov == NULL)
 195                 return (-ENOMEM);
 196
 197         desc->bd_md.start = iov;
 198         desc->bd_md.niov = 0;
 199         desc->bd_md.length = 0;
 200         desc->bd_md.threshold = 1;
 201         desc->bd_md.options = PTL_MD_OP_PUT | PTL_MD_IOV;
 202         desc->bd_md.user_ptr = desc;
 203         desc->bd_md.eventq = bulk_sink_eq;
 204
 205         list_for_each_safe(tmp, next, &desc->bd_page_list) {
 206                 struct ptlrpc_bulk_page *bulk;
 207                 bulk = list_entry(tmp, struct ptlrpc_bulk_page, bp_link);
 208
 209                 LASSERT (desc->bd_md.niov < desc->bd_page_count);
 210
 211                 if (desc->bd_md.niov == 0)
 212                         xid = bulk->bp_xid;
 213                 LASSERT (xid == bulk->bp_xid);   /* should all be the same */
 214
 215                 iov[desc->bd_md.niov].iov_base = bulk->bp_buf;
 216                 iov[desc->bd_md.niov].iov_len = bulk->bp_buflen;
 217                 desc->bd_md.niov++;
 218                 desc->bd_md.length += bulk->bp_buflen;
 219         }
 220
 221         LASSERT (desc->bd_md.niov == desc->bd_page_count);
 222         LASSERT (desc->bd_md.niov != 0);
 223
 224         rc = PtlMEAttach(desc->bd_connection->c_peer.peer_ni,
 225                          desc->bd_portal, local_id, xid, 0,
 226                          PTL_UNLINK, PTL_INS_AFTER, &desc->bd_me_h);
 227
 228         ptlrpc_put_bulk_iov (desc, iov);
 229
 230         if (rc != PTL_OK) {
 231                 CERROR("PtlMEAttach failed: %d\n", rc);
 232                 LBUG();
 233                 GOTO(cleanup, rc);
 234         }
 235
 236         rc = PtlMDAttach(desc->bd_me_h, desc->bd_md, PTL_UNLINK,
 237                          &desc->bd_md_h);
 238         if (rc != PTL_OK) {
 239                 CERROR("PtlMDAttach failed: %d\n", rc);
 240                 LBUG();
 241                 GOTO(cleanup, rc);
 242         }
 243
 244         CDEBUG(D_NET, "Setup bulk sink buffers: %u pages %u bytes, xid %u, "
 245                "portal %u\n", desc->bd_md.niov, desc->bd_md.length,
 246                xid, desc->bd_portal);
 247
 248         RETURN(0);
 249
 250  cleanup:
 251         ptlrpc_abort_bulk(desc);
 252
 253         return rc;
 254 }
 255
 256 int ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc)
 257 {
 258         /* This should be safe: these handles are initialized to be
 259          * invalid in ptlrpc_prep_bulk() */
 260         PtlMDUnlink(desc->bd_md_h);
 261         PtlMEUnlink(desc->bd_me_h);
 262
 263         return 0;
 264 }
 265
 266 int ptlrpc_reply(struct ptlrpc_service *svc, struct ptlrpc_request *req)
 267 {
 268         if (req->rq_repmsg == NULL) {
 269                 CERROR("bad: someone called ptlrpc_reply when they meant "
 270                        "ptlrpc_error\n");
 271                 return -EINVAL;
 272         }
 273
 274         /* FIXME: we need to increment the count of handled events */
 275         req->rq_type = PTL_RPC_TYPE_REPLY;
 276         //req->rq_repmsg->conn = req->rq_connection->c_remote_conn;
 277         //req->rq_repmsg->token = req->rq_connection->c_remote_token;
 278         req->rq_repmsg->status = HTON__u32(req->rq_status);
 279         req->rq_repmsg->type = HTON__u32(req->rq_type);
 280         return ptl_send_buf(req, req->rq_connection, svc->srv_rep_portal);
 281 }
 282
 283 int ptlrpc_error(struct ptlrpc_service *svc, struct ptlrpc_request *req)
 284 {
 285         int rc;
 286         ENTRY;
 287
 288         if (req->rq_repmsg) {
 289                 CERROR("req already has repmsg\n");
 290                 LBUG();
 291         }
 292
 293         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 294         if (rc)
 295                 RETURN(rc);
 296
 297         req->rq_repmsg->type = HTON__u32(PTL_RPC_MSG_ERR);
 298
 299         rc = ptlrpc_reply(svc, req);
 300         RETURN(rc);
 301 }
 302
 303
 304 int ptl_send_rpc(struct ptlrpc_request *request)
 305 {
 306         int rc;
 307         char *repbuf;
 308
 309         ENTRY;
 310
 311         if (NTOH__u32(request->rq_reqmsg->type) != PTL_RPC_MSG_REQUEST) {
 312                 CERROR("wrong packet type sent %d\n",
 313                        NTOH__u32(request->rq_reqmsg->type));
 314                 LBUG();
 315                 RETURN(EINVAL);
 316         }
 317         if (request->rq_replen == 0) {
 318                 CERROR("request->rq_replen is 0!\n");
 319                 RETURN(EINVAL);
 320         }
 321
 322         /* request->rq_repmsg is set only when the reply comes in, in
 323          * client_packet_callback() */
 324         if (request->rq_reply_md.start)
 325                 OBD_FREE(request->rq_reply_md.start, request->rq_replen);
 326
 327         OBD_ALLOC(repbuf, request->rq_replen);
 328         if (!repbuf) {
 329                 LBUG();
 330                 RETURN(ENOMEM);
 331         }
 332
 333         // down(&request->rq_client->cli_rpc_sem);
 334
 335         rc = PtlMEAttach(request->rq_connection->c_peer.peer_ni,
 336                          request->rq_import->imp_client->cli_reply_portal,
 337                          local_id, request->rq_xid, 0, PTL_UNLINK,
 338                          PTL_INS_AFTER, &request->rq_reply_me_h);
 339         if (rc != PTL_OK) {
 340                 CERROR("PtlMEAttach failed: %d\n", rc);
 341                 LBUG();
 342                 GOTO(cleanup, rc);
 343         }
 344
 345         request->rq_type = PTL_RPC_TYPE_REQUEST;
 346         request->rq_reply_md.start = repbuf;
 347         request->rq_reply_md.length = request->rq_replen;
 348         request->rq_reply_md.threshold = 1;
 349         request->rq_reply_md.options = PTL_MD_OP_PUT;
 350         request->rq_reply_md.user_ptr = request;
 351         request->rq_reply_md.eventq = reply_in_eq;
 352
 353         rc = PtlMDAttach(request->rq_reply_me_h, request->rq_reply_md,
 354                          PTL_UNLINK, &request->rq_reply_md_h);
 355         if (rc != PTL_OK) {
 356                 CERROR("PtlMDAttach failed: %d\n", rc);
 357                 LBUG();
 358                 GOTO(cleanup2, rc);
 359         }
 360
 361         CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid %Lu, portal %u\n",
 362                request->rq_replen, request->rq_xid,
 363                request->rq_import->imp_client->cli_reply_portal);
 364
 365         rc = ptl_send_buf(request, request->rq_connection,
 366                           request->rq_import->imp_client->cli_request_portal);
 367         RETURN(rc);
 368
 369  cleanup2:
 370         PtlMEUnlink(request->rq_reply_me_h);
 371  cleanup:
 372         OBD_FREE(repbuf, request->rq_replen);
 373         // up(&request->rq_client->cli_rpc_sem);
 374
 375         return rc;
 376 }
 377
 378 void ptlrpc_link_svc_me(struct ptlrpc_service *service, int i)
 379 {
 380         int rc;
 381         ptl_md_t dummy;
 382         ptl_handle_md_t md_h;
 383
 384         /* Attach the leading ME on which we build the ring */
 385         rc = PtlMEAttach(service->srv_self.peer_ni, service->srv_req_portal,
 386                          local_id, 0, ~0, PTL_RETAIN, PTL_INS_BEFORE,
 387                          &(service->srv_me_h[i]));
 388         if (rc != PTL_OK) {
 389                 CERROR("PtlMEAttach failed: %d\n", rc);
 390                 LBUG();
 391         }
 392
 393         if (service->srv_ref_count[i])
 394                 LBUG();
 395
 396         dummy.start         = service->srv_buf[i];
 397         dummy.length        = service->srv_buf_size;
 398         dummy.max_offset    = service->srv_buf_size;
 399         dummy.threshold     = PTL_MD_THRESH_INF;
 400         dummy.options       = PTL_MD_OP_PUT | PTL_MD_AUTO_UNLINK;
 401         dummy.user_ptr      = service;
 402         dummy.eventq        = service->srv_eq_h;
 403         dummy.max_offset    = service->srv_buf_size;
 404
 405         rc = PtlMDAttach(service->srv_me_h[i], dummy, PTL_UNLINK, &md_h);
 406         if (rc != PTL_OK) {
 407                 /* cleanup */
 408                 CERROR("PtlMDAttach failed: %d\n", rc);
 409                 LBUG();
 410         }
 411 }
 412
 413 /* ptl_handled_rpc() should be called by the sleeping process once
 414  * it finishes processing an event.  This ensures the ref count is
 415  * decremented and that the rpc ring buffer cycles properly.
 416  */
 417 int ptl_handled_rpc(struct ptlrpc_service *service, void *start)
 418 {
 419         int index;
 420
 421         spin_lock(&service->srv_lock);
 422         for (index = 0; index < service->srv_ring_length; index++)
 423                 if (service->srv_buf[index] == start)
 424                         break;
 425
 426         if (index == service->srv_ring_length)
 427                 LBUG();
 428
 429         CDEBUG(D_INFO, "MD index=%d Ref Count=%d\n", index,
 430                service->srv_ref_count[index]);
 431         service->srv_ref_count[index]--;
 432
 433         if (service->srv_ref_count[index] < 0)
 434                 LBUG();
 435
 436         if (service->srv_ref_count[index] == 0 &&
 437             !ptl_is_valid_handle(&(service->srv_me_h[index]))) {
 438                 CDEBUG(D_NET, "relinking %d\n", index);
 439                 ptlrpc_link_svc_me(service, index);
 440         }
 441
 442         spin_unlock(&service->srv_lock);
 443         return 0;
 444 }