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a29a194a PM |
1 | /* |
2 | * net/tipc/ib_media.c: Infiniband bearer support for TIPC | |
3 | * | |
4 | * Copyright (c) 2013 Patrick McHardy <kaber@trash.net> | |
5 | * | |
6 | * Based on eth_media.c, which carries the following copyright notice: | |
7 | * | |
8 | * Copyright (c) 2001-2007, Ericsson AB | |
9 | * Copyright (c) 2005-2008, 2011, Wind River Systems | |
10 | * All rights reserved. | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions are met: | |
14 | * | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * 2. Redistributions in binary form must reproduce the above copyright | |
18 | * notice, this list of conditions and the following disclaimer in the | |
19 | * documentation and/or other materials provided with the distribution. | |
20 | * 3. Neither the names of the copyright holders nor the names of its | |
21 | * contributors may be used to endorse or promote products derived from | |
22 | * this software without specific prior written permission. | |
23 | * | |
24 | * Alternatively, this software may be distributed under the terms of the | |
25 | * GNU General Public License ("GPL") version 2 as published by the Free | |
26 | * Software Foundation. | |
27 | * | |
28 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
29 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
30 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
31 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
32 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
33 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
34 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
35 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
36 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
37 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
38 | * POSSIBILITY OF SUCH DAMAGE. | |
39 | */ | |
40 | ||
41 | #include <linux/if_infiniband.h> | |
42 | #include "core.h" | |
43 | #include "bearer.h" | |
44 | ||
a29a194a PM |
45 | /** |
46 | * ib_media_addr_set - initialize Infiniband media address structure | |
47 | * | |
48 | * Media-dependent "value" field stores MAC address in first 6 bytes | |
49 | * and zeroes out the remaining bytes. | |
50 | */ | |
51 | static void ib_media_addr_set(const struct tipc_bearer *tb_ptr, | |
52 | struct tipc_media_addr *a, char *mac) | |
53 | { | |
54 | BUILD_BUG_ON(sizeof(a->value) < INFINIBAND_ALEN); | |
55 | memcpy(a->value, mac, INFINIBAND_ALEN); | |
56 | a->media_id = TIPC_MEDIA_TYPE_IB; | |
57 | a->broadcast = !memcmp(mac, tb_ptr->bcast_addr.value, INFINIBAND_ALEN); | |
58 | } | |
59 | ||
60 | /** | |
61 | * send_msg - send a TIPC message out over an InfiniBand interface | |
62 | */ | |
63 | static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr, | |
64 | struct tipc_media_addr *dest) | |
65 | { | |
66 | struct sk_buff *clone; | |
a29a194a | 67 | int delta; |
6e967adf | 68 | struct net_device *dev = tb_ptr->dev; |
a29a194a PM |
69 | |
70 | clone = skb_clone(buf, GFP_ATOMIC); | |
71 | if (!clone) | |
72 | return 0; | |
73 | ||
a29a194a | 74 | delta = dev->hard_header_len - skb_headroom(buf); |
a29a194a PM |
75 | if ((delta > 0) && |
76 | pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { | |
77 | kfree_skb(clone); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | skb_reset_network_header(clone); | |
82 | clone->dev = dev; | |
83 | clone->protocol = htons(ETH_P_TIPC); | |
84 | dev_hard_header(clone, dev, ETH_P_TIPC, dest->value, | |
85 | dev->dev_addr, clone->len); | |
86 | dev_queue_xmit(clone); | |
87 | return 0; | |
88 | } | |
89 | ||
a29a194a | 90 | /** |
4babbaa8 | 91 | * enable_media - attach TIPC bearer to an InfiniBand interface |
a29a194a | 92 | */ |
4babbaa8 | 93 | static int enable_media(struct tipc_bearer *tb_ptr) |
a29a194a | 94 | { |
2537af9d | 95 | struct net_device *dev; |
a29a194a | 96 | char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1; |
a29a194a PM |
97 | |
98 | /* Find device with specified name */ | |
2537af9d | 99 | dev = dev_get_by_name(&init_net, driver_name); |
a29a194a PM |
100 | if (!dev) |
101 | return -ENODEV; | |
102 | ||
a29a194a | 103 | /* Associate TIPC bearer with InfiniBand bearer */ |
37cb0620 | 104 | tb_ptr->dev = dev; |
6e967adf | 105 | tb_ptr->usr_handle = NULL; |
a29a194a PM |
106 | memset(tb_ptr->bcast_addr.value, 0, sizeof(tb_ptr->bcast_addr.value)); |
107 | memcpy(tb_ptr->bcast_addr.value, dev->broadcast, INFINIBAND_ALEN); | |
108 | tb_ptr->bcast_addr.media_id = TIPC_MEDIA_TYPE_IB; | |
109 | tb_ptr->bcast_addr.broadcast = 1; | |
110 | tb_ptr->mtu = dev->mtu; | |
a29a194a | 111 | ib_media_addr_set(tb_ptr, &tb_ptr->addr, (char *)dev->dev_addr); |
37cb0620 | 112 | rcu_assign_pointer(dev->tipc_ptr, tb_ptr); |
a29a194a PM |
113 | return 0; |
114 | } | |
115 | ||
a29a194a | 116 | /** |
4babbaa8 | 117 | * disable_media - detach TIPC bearer from an InfiniBand interface |
a29a194a PM |
118 | * |
119 | * Mark InfiniBand bearer as inactive so that incoming buffers are thrown away, | |
120 | * then get worker thread to complete bearer cleanup. (Can't do cleanup | |
121 | * here because cleanup code needs to sleep and caller holds spinlocks.) | |
122 | */ | |
4babbaa8 | 123 | static void disable_media(struct tipc_bearer *tb_ptr) |
a29a194a | 124 | { |
37cb0620 | 125 | RCU_INIT_POINTER(tb_ptr->dev->tipc_ptr, NULL); |
6e967adf | 126 | dev_put(tb_ptr->dev); |
a29a194a PM |
127 | } |
128 | ||
a29a194a PM |
129 | /** |
130 | * ib_addr2str - convert InfiniBand address to string | |
131 | */ | |
132 | static int ib_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size) | |
133 | { | |
134 | if (str_size < 60) /* 60 = 19 * strlen("xx:") + strlen("xx\0") */ | |
135 | return 1; | |
136 | ||
d77e41e1 | 137 | sprintf(str_buf, "%20phC", a->value); |
a29a194a PM |
138 | |
139 | return 0; | |
140 | } | |
141 | ||
142 | /** | |
143 | * ib_addr2msg - convert InfiniBand address format to message header format | |
144 | */ | |
145 | static int ib_addr2msg(struct tipc_media_addr *a, char *msg_area) | |
146 | { | |
147 | memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE); | |
148 | msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_IB; | |
149 | memcpy(msg_area, a->value, INFINIBAND_ALEN); | |
150 | return 0; | |
151 | } | |
152 | ||
153 | /** | |
154 | * ib_msg2addr - convert message header address format to InfiniBand format | |
155 | */ | |
156 | static int ib_msg2addr(const struct tipc_bearer *tb_ptr, | |
157 | struct tipc_media_addr *a, char *msg_area) | |
158 | { | |
159 | ib_media_addr_set(tb_ptr, a, msg_area); | |
160 | return 0; | |
161 | } | |
162 | ||
163 | /* | |
164 | * InfiniBand media registration info | |
165 | */ | |
5702dbab | 166 | struct tipc_media ib_media_info = { |
a29a194a | 167 | .send_msg = send_msg, |
4babbaa8 YX |
168 | .enable_media = enable_media, |
169 | .disable_media = disable_media, | |
a29a194a PM |
170 | .addr2str = ib_addr2str, |
171 | .addr2msg = ib_addr2msg, | |
172 | .msg2addr = ib_msg2addr, | |
173 | .priority = TIPC_DEF_LINK_PRI, | |
174 | .tolerance = TIPC_DEF_LINK_TOL, | |
175 | .window = TIPC_DEF_LINK_WIN, | |
176 | .type_id = TIPC_MEDIA_TYPE_IB, | |
177 | .name = "ib" | |
178 | }; | |
179 |