lustre/ptlrpc/events.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/module.h>
  26 #include <linux/obd_support.h>
  27 #include <linux/lustre_net.h>
  28
  29 ptl_handle_eq_t request_out_eq, reply_in_eq, reply_out_eq, bulk_source_eq,
  30         bulk_sink_eq;
  31 static const ptl_handle_ni_t *socknal_nip = NULL, *toenal_nip = NULL,
  32         *qswnal_nip = NULL, *gmnal_nip = NULL;
  33
  34 /*
  35  *  Free the packet when it has gone out
  36  */
  37 static int request_out_callback(ptl_event_t *ev)
  38 {
  39         struct ptlrpc_request *req = ev->mem_desc.user_ptr;
  40         ENTRY;
  41
  42         /* requests always contiguous */
  43         LASSERT((ev->mem_desc.options & PTL_MD_IOV) == 0);
  44
  45         if (ev->type != PTL_EVENT_SENT) {
  46                 // XXX make sure we understand all events, including ACK's
  47                 CERROR("Unknown event %d\n", ev->type);
  48                 LBUG();
  49         }
  50
  51         /* this balances the atomic_inc in ptl_send_rpc */
  52         ptlrpc_req_finished(req);
  53         RETURN(1);
  54 }
  55
  56
  57 /*
  58  *  Free the packet when it has gone out
  59  */
  60 static int reply_out_callback(ptl_event_t *ev)
  61 {
  62         ENTRY;
  63
  64         /* replies always contiguous */
  65         LASSERT((ev->mem_desc.options & PTL_MD_IOV) == 0);
  66
  67         if (ev->type == PTL_EVENT_SENT) {
  68                 OBD_FREE(ev->mem_desc.start, ev->mem_desc.length);
  69         } else {
  70                 // XXX make sure we understand all events, including ACK's
  71                 CERROR("Unknown event %d\n", ev->type);
  72                 LBUG();
  73         }
  74
  75         RETURN(1);
  76 }
  77
  78 /*
  79  * Wake up the thread waiting for the reply once it comes in.
  80  */
  81 static int reply_in_callback(ptl_event_t *ev)
  82 {
  83         struct ptlrpc_request *req = ev->mem_desc.user_ptr;
  84         ENTRY;
  85
  86         /* replies always contiguous */
  87         LASSERT((ev->mem_desc.options & PTL_MD_IOV) == 0);
  88
  89         if (req->rq_xid == 0x5a5a5a5a5a5a5a5a) {
  90                 CERROR("Reply received for freed request!  Probably a missing "
  91                        "ptlrpc_abort()\n");
  92                 LBUG();
  93         }
  94
  95         if (req->rq_xid != ev->match_bits) {
  96                 CERROR("Reply packet for wrong request\n");
  97                 LBUG();
  98         }
  99
 100         if (ev->type == PTL_EVENT_PUT) {
 101                 req->rq_repmsg = ev->mem_desc.start + ev->offset;
 102                 barrier();
 103                 wake_up(&req->rq_wait_for_rep);
 104         } else {
 105                 // XXX make sure we understand all events, including ACK's
 106                 CERROR("Unknown event %d\n", ev->type);
 107                 LBUG();
 108         }
 109
 110         RETURN(1);
 111 }
 112
 113 int request_in_callback(ptl_event_t *ev)
 114 {
 115         struct ptlrpc_request_buffer_desc *rqbd = ev->mem_desc.user_ptr;
 116         struct ptlrpc_service *service = rqbd->rqbd_service;
 117
 118         /* requests always contiguous */
 119         LASSERT((ev->mem_desc.options & PTL_MD_IOV) == 0);
 120         /* we only enable puts */
 121         LASSERT(ev->type == PTL_EVENT_PUT);
 122         LASSERT(atomic_read(&service->srv_nrqbds_receiving) > 0);
 123         LASSERT(atomic_read(&rqbd->rqbd_refcount) > 0);
 124
 125         if (ev->rlength != ev->mlength)
 126                 CERROR("Warning: Possibly truncated rpc (%d/%d)\n",
 127                        ev->mlength, ev->rlength);
 128
 129         if (ptl_is_valid_handle(&ev->unlinked_me)) {
 130                 /* This is the last request to be received into this
 131                  * request buffer.  We don't bump the refcount, since the
 132                  * thread servicing this event is effectively taking over
 133                  * portals' reference.
 134                  */
 135 #warning ev->unlinked_me.nal_idx is not set properly in a callback
 136                 LASSERT(ev->unlinked_me.handle_idx==rqbd->rqbd_me_h.handle_idx);
 137
 138                 /* we're off the air */
 139                 /* we'll probably start dropping packets in portals soon */
 140                 if (atomic_dec_and_test(&service->srv_nrqbds_receiving))
 141                         CERROR("All request buffers busy\n");
 142         } else {
 143                 /* +1 ref for service thread */
 144                 atomic_inc(&rqbd->rqbd_refcount);
 145         }
 146
 147         wake_up(&service->srv_waitq);
 148
 149         return 0;
 150 }
 151
 152 static int bulk_source_callback(ptl_event_t *ev)
 153 {
 154         struct ptlrpc_bulk_desc *desc = ev->mem_desc.user_ptr;
 155         struct ptlrpc_bulk_page *bulk;
 156         struct list_head        *tmp;
 157         struct list_head        *next;
 158         ENTRY;
 159
 160         CDEBUG(D_NET, "got %s event %d\n",
 161                (ev->type == PTL_EVENT_SENT) ? "SENT" :
 162                (ev->type == PTL_EVENT_ACK)  ? "ACK"  : "UNEXPECTED", ev->type);
 163
 164         LASSERT(ev->type == PTL_EVENT_SENT || ev->type == PTL_EVENT_ACK);
 165
 166         LASSERT(atomic_read(&desc->bd_source_callback_count) > 0 &&
 167                 atomic_read(&desc->bd_source_callback_count) <= 2);
 168
 169         /* 1 fragment for each page always */
 170         LASSERT(ev->mem_desc.niov == desc->bd_page_count);
 171
 172         if (atomic_dec_and_test(&desc->bd_source_callback_count)) {
 173                 list_for_each_safe(tmp, next, &desc->bd_page_list) {
 174                         bulk = list_entry(tmp, struct ptlrpc_bulk_page,
 175                                           bp_link);
 176
 177                         if (bulk->bp_cb != NULL)
 178                                 bulk->bp_cb(bulk);
 179                 }
 180                 desc->bd_flags |= PTL_BULK_FL_SENT;
 181                 wake_up(&desc->bd_waitq);
 182                 if (desc->bd_ptl_ev_hdlr != NULL)
 183                         desc->bd_ptl_ev_hdlr(desc);
 184         }
 185
 186         RETURN(0);
 187 }
 188
 189 static int bulk_sink_callback(ptl_event_t *ev)
 190 {
 191         struct ptlrpc_bulk_desc *desc = ev->mem_desc.user_ptr;
 192         struct ptlrpc_bulk_page *bulk;
 193         struct list_head        *tmp;
 194         struct list_head        *next;
 195         ptl_size_t               total = 0;
 196         ENTRY;
 197
 198         if (ev->type == PTL_EVENT_PUT) {
 199                 /* put with zero offset */
 200                 LASSERT(ev->offset == 0);
 201                 /* used iovs */
 202                 LASSERT((ev->mem_desc.options & PTL_MD_IOV) != 0);
 203                 /* 1 fragment for each page always */
 204                 LASSERT(ev->mem_desc.niov == desc->bd_page_count);
 205
 206                 list_for_each_safe (tmp, next, &desc->bd_page_list) {
 207                         bulk = list_entry(tmp, struct ptlrpc_bulk_page,
 208                                           bp_link);
 209
 210                         total += bulk->bp_buflen;
 211
 212                         if (bulk->bp_cb != NULL)
 213                                 bulk->bp_cb(bulk);
 214                 }
 215
 216                 LASSERT(ev->mem_desc.length == total);
 217
 218                 desc->bd_flags |= PTL_BULK_FL_RCVD;
 219                 wake_up(&desc->bd_waitq);
 220                 if (desc->bd_ptl_ev_hdlr != NULL)
 221                         desc->bd_ptl_ev_hdlr(desc);
 222         } else {
 223                 CERROR("Unexpected event type!\n");
 224                 LBUG();
 225         }
 226
 227         RETURN(1);
 228 }
 229
 230 int ptlrpc_init_portals(void)
 231 {
 232         int rc;
 233         ptl_handle_ni_t ni;
 234
 235         /* Use the qswnal if it's there */
 236         if ((qswnal_nip = inter_module_get("kqswnal_ni")) != NULL)
 237                 ni = *qswnal_nip;
 238         else if ((gmnal_nip = inter_module_get("kgmnal_ni")) != NULL)
 239                 ni = *gmnal_nip;
 240         else if ((socknal_nip = inter_module_get("ksocknal_ni")) != NULL)
 241                 ni = *socknal_nip;
 242         else if ((toenal_nip = inter_module_get("ktoenal_ni")) != NULL)
 243                 ni = *toenal_nip;
 244         else {
 245                 CERROR("get_ni failed: is a NAL module loaded?\n");
 246                 return -EIO;
 247         }
 248
 249         rc = PtlEQAlloc(ni, 1024, request_out_callback, &request_out_eq);
 250         if (rc != PTL_OK)
 251                 CERROR("PtlEQAlloc failed: %d\n", rc);
 252
 253         rc = PtlEQAlloc(ni, 1024, reply_out_callback, &reply_out_eq);
 254         if (rc != PTL_OK)
 255                 CERROR("PtlEQAlloc failed: %d\n", rc);
 256
 257         rc = PtlEQAlloc(ni, 1024, reply_in_callback, &reply_in_eq);
 258         if (rc != PTL_OK)
 259                 CERROR("PtlEQAlloc failed: %d\n", rc);
 260
 261         rc = PtlEQAlloc(ni, 1024, bulk_source_callback, &bulk_source_eq);
 262         if (rc != PTL_OK)
 263                 CERROR("PtlEQAlloc failed: %d\n", rc);
 264
 265         rc = PtlEQAlloc(ni, 1024, bulk_sink_callback, &bulk_sink_eq);
 266         if (rc != PTL_OK)
 267                 CERROR("PtlEQAlloc failed: %d\n", rc);
 268
 269         return rc;
 270 }
 271
 272 void ptlrpc_exit_portals(void)
 273 {
 274         PtlEQFree(request_out_eq);
 275         PtlEQFree(reply_out_eq);
 276         PtlEQFree(reply_in_eq);
 277         PtlEQFree(bulk_source_eq);
 278         PtlEQFree(bulk_sink_eq);
 279
 280         if (qswnal_nip != NULL)
 281                 inter_module_put("kqswnal_ni");
 282         if (socknal_nip != NULL)
 283                 inter_module_put("ksocknal_ni");
 284         if (gmnal_nip != NULL)
 285                 inter_module_put("kgmnal_ni");
 286         if (toenal_nip != NULL)
 287                 inter_module_put("ktoenal_ni");
 288 }