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LU-14945 lnet: don't use hops to determine the route state
[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  */
31
32 #define DEBUG_SUBSYSTEM S_LNET
33 #include <lnet/lib-lnet.h>
34
35 static int
36 lolnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
37 {
38         LASSERT(!lntmsg->msg_routing);
39         LASSERT(!lntmsg->msg_target_is_router);
40
41         return lnet_parse(ni, &lntmsg->msg_hdr,
42                           lnet_nid_to_nid4(&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 bio_vec *kiov,
49            unsigned int offset, unsigned int mlen, unsigned int rlen)
50 {
51         struct lnet_msg *sendmsg = private;
52
53         if (lntmsg) {                   /* not discarding */
54                 lnet_copy_kiov2kiov(niov, kiov, offset,
55                                     sendmsg->msg_niov,
56                                     sendmsg->msg_kiov,
57                                     sendmsg->msg_offset, mlen);
58
59                 lnet_finalize(lntmsg, 0);
60         }
61
62         lnet_finalize(sendmsg, 0);
63         return 0;
64 }
65
66 static int lolnd_instanced;
67
68 static void
69 lolnd_shutdown(struct lnet_ni *ni)
70 {
71         CDEBUG (D_NET, "shutdown\n");
72         LASSERT(lolnd_instanced);
73
74         lolnd_instanced = 0;
75 }
76
77 static int
78 lolnd_startup(struct lnet_ni *ni)
79 {
80         LASSERT (ni->ni_net->net_lnd == &the_lolnd);
81         LASSERT (!lolnd_instanced);
82         lolnd_instanced = 1;
83
84         return (0);
85 }
86
87 const struct lnet_lnd the_lolnd = {
88         .lnd_type       = LOLND,
89         .lnd_startup    = lolnd_startup,
90         .lnd_shutdown   = lolnd_shutdown,
91         .lnd_send       = lolnd_send,
92         .lnd_recv       = lolnd_recv
93 };