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                         if (to->type & ITER_KVEC)
  52                                 lnet_copy_iov2iov(to->nr_segs, to->kvec, to->iov_offset,
  53                                                   sendmsg->msg_niov,
  54                                                   sendmsg->msg_iov,
  55                                                   sendmsg->msg_offset, iov_iter_count(to));
  56                         else
  57                                 lnet_copy_iov2kiov(to->nr_segs, to->bvec, to->iov_offset,
  58                                                    sendmsg->msg_niov,
  59                                                    sendmsg->msg_iov,
  60                                                    sendmsg->msg_offset, iov_iter_count(to));
  61                 } else {
  62                         if (to->type & ITER_KVEC)
  63                                 lnet_copy_kiov2iov(to->nr_segs, to->kvec, to->iov_offset,
  64                                                    sendmsg->msg_niov,
  65                                                    sendmsg->msg_kiov,
  66                                                    sendmsg->msg_offset, iov_iter_count(to));
  67                         else
  68                                 lnet_copy_kiov2kiov(to->nr_segs, to->bvec, to->iov_offset,
  69                                                     sendmsg->msg_niov,
  70                                                     sendmsg->msg_kiov,
  71                                                     sendmsg->msg_offset, iov_iter_count(to));
  72                 }
  73
  74                 lnet_finalize(ni, lntmsg, 0);
  75         }
  76
  77         lnet_finalize(ni, sendmsg, 0);
  78         return 0;
  79 }
  80
  81 static int lolnd_instanced;
  82
  83 static void
  84 lolnd_shutdown(lnet_ni_t *ni)
  85 {
  86         CDEBUG(D_NET, "shutdown\n");
  87         LASSERT(lolnd_instanced);
  88
  89         lolnd_instanced = 0;
  90 }
  91
  92 static int
  93 lolnd_startup(lnet_ni_t *ni)
  94 {
  95         LASSERT(ni->ni_lnd == &the_lolnd);
  96         LASSERT(!lolnd_instanced);
  97         lolnd_instanced = 1;
  98
  99         return 0;
 100 }
 101
 102 lnd_t the_lolnd = {
 103         /* .lnd_list       = */ {&the_lolnd.lnd_list, &the_lolnd.lnd_list},
 104         /* .lnd_refcount   = */ 0,
 105         /* .lnd_type       = */ LOLND,
 106         /* .lnd_startup    = */ lolnd_startup,
 107         /* .lnd_shutdown   = */ lolnd_shutdown,
 108         /* .lnt_ctl        = */ NULL,
 109         /* .lnd_send       = */ lolnd_send,
 110         /* .lnd_recv       = */ lolnd_recv,
 111         /* .lnd_eager_recv = */ NULL,
 112         /* .lnd_notify     = */ NULL,
 113         /* .lnd_accept     = */ NULL
 114 };