drivers/staging/lustre/lnet/lnet/lo.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 /*
  27  * This file is part of Lustre, http://www.lustre.org/
  28  * Lustre is a trademark of Sun Microsystems, Inc.
  29  */
  30
  31 #define DEBUG_SUBSYSTEM S_LNET
  32 #include "../../include/linux/lnet/lib-lnet.h"
  33
  34 static int
  35 lolnd_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
  36 {
  37         LASSERT(!lntmsg->msg_routing);
  38         LASSERT(!lntmsg->msg_target_is_router);
  39
  40         return lnet_parse(ni, &lntmsg->msg_hdr, ni->ni_nid, lntmsg, 0);
  41 }
  42
  43 static int
  44 lolnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg,
  45            int delayed, struct iov_iter *to, unsigned int rlen)
  46 {
  47         lnet_msg_t *sendmsg = private;
  48
  49         if (lntmsg) {              /* not discarding */
  50                 if (sendmsg->msg_iov)
  51                         lnet_copy_iov2iter(to,
  52                                            sendmsg->msg_niov,
  53                                            sendmsg->msg_iov,
  54                                            sendmsg->msg_offset,
  55                                            iov_iter_count(to));
  56                 else
  57                         lnet_copy_kiov2iter(to,
  58                                             sendmsg->msg_niov,
  59                                             sendmsg->msg_kiov,
  60                                             sendmsg->msg_offset,
  61                                             iov_iter_count(to));
  62
  63                 lnet_finalize(ni, lntmsg, 0);
  64         }
  65
  66         lnet_finalize(ni, sendmsg, 0);
  67         return 0;
  68 }
  69
  70 static int lolnd_instanced;
  71
  72 static void
  73 lolnd_shutdown(lnet_ni_t *ni)
  74 {
  75         CDEBUG(D_NET, "shutdown\n");
  76         LASSERT(lolnd_instanced);
  77
  78         lolnd_instanced = 0;
  79 }
  80
  81 static int
  82 lolnd_startup(lnet_ni_t *ni)
  83 {
  84         LASSERT(ni->ni_lnd == &the_lolnd);
  85         LASSERT(!lolnd_instanced);
  86         lolnd_instanced = 1;
  87
  88         return 0;
  89 }
  90
  91 lnd_t the_lolnd = {
  92         /* .lnd_list       = */ {&the_lolnd.lnd_list, &the_lolnd.lnd_list},
  93         /* .lnd_refcount   = */ 0,
  94         /* .lnd_type       = */ LOLND,
  95         /* .lnd_startup    = */ lolnd_startup,
  96         /* .lnd_shutdown   = */ lolnd_shutdown,
  97         /* .lnt_ctl        = */ NULL,
  98         /* .lnd_send       = */ lolnd_send,
  99         /* .lnd_recv       = */ lolnd_recv,
 100         /* .lnd_eager_recv = */ NULL,
 101         /* .lnd_notify     = */ NULL,
 102         /* .lnd_accept     = */ NULL
 103 };