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[fs/lustre-release.git] / 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  * Copyright (c) 2017, Intel Corporation.
27  */
28 /*
29  * This file is part of Lustre, http://www.lustre.org/
30  * Lustre is a trademark of Sun Microsystems, Inc.
31  */
32
33 #define DEBUG_SUBSYSTEM S_LNET
34 #include <lnet/lib-lnet.h>
35
36 static int
37 lolnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
38 {
39         LASSERT(!lntmsg->msg_routing);
40         LASSERT(!lntmsg->msg_target_is_router);
41
42         return lnet_parse(ni, &lntmsg->msg_hdr, ni->ni_nid, lntmsg, 0);
43 }
44
45 static int
46 lolnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
47            int delayed, unsigned int niov,
48            struct kvec *iov, struct bio_vec *kiov,
49            unsigned int offset, unsigned int mlen, unsigned int rlen)
50 {
51         struct lnet_msg *sendmsg = private;
52
53         if (lntmsg != NULL) {                   /* not discarding */
54                 if (iov != NULL)
55                         lnet_copy_kiov2iov(niov, iov, offset,
56                                            sendmsg->msg_niov,
57                                            sendmsg->msg_kiov,
58                                            sendmsg->msg_offset, mlen);
59                 else
60                         lnet_copy_kiov2kiov(niov, kiov, offset,
61                                             sendmsg->msg_niov,
62                                             sendmsg->msg_kiov,
63                                             sendmsg->msg_offset, mlen);
64
65                 lnet_finalize(lntmsg, 0);
66         }
67
68         lnet_finalize(sendmsg, 0);
69         return 0;
70 }
71
72 static int lolnd_instanced;
73
74 static void
75 lolnd_shutdown(struct lnet_ni *ni)
76 {
77         CDEBUG (D_NET, "shutdown\n");
78         LASSERT(lolnd_instanced);
79
80         lolnd_instanced = 0;
81 }
82
83 static int
84 lolnd_startup(struct lnet_ni *ni)
85 {
86         LASSERT (ni->ni_net->net_lnd == &the_lolnd);
87         LASSERT (!lolnd_instanced);
88         lolnd_instanced = 1;
89
90         return (0);
91 }
92
93 const struct lnet_lnd the_lolnd = {
94         .lnd_type       = LOLND,
95         .lnd_startup    = lolnd_startup,
96         .lnd_shutdown   = lolnd_shutdown,
97         .lnd_send       = lolnd_send,
98         .lnd_recv       = lolnd_recv
99 };