Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 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 | |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 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; |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 67 | int delta; |
Ying Xue | 6e967ad | 2013-12-10 20:45:42 -0800 | [diff] [blame^] | 68 | struct net_device *dev = tb_ptr->dev; |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 69 | |
| 70 | clone = skb_clone(buf, GFP_ATOMIC); |
| 71 | if (!clone) |
| 72 | return 0; |
| 73 | |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 74 | delta = dev->hard_header_len - skb_headroom(buf); |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 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 | |
| 90 | /** |
Ying Xue | 4babbaa | 2013-10-18 07:23:17 +0200 | [diff] [blame] | 91 | * enable_media - attach TIPC bearer to an InfiniBand interface |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 92 | */ |
Ying Xue | 4babbaa | 2013-10-18 07:23:17 +0200 | [diff] [blame] | 93 | static int enable_media(struct tipc_bearer *tb_ptr) |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 94 | { |
Ying Xue | 2537af9 | 2013-06-17 10:54:51 -0400 | [diff] [blame] | 95 | struct net_device *dev; |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 96 | char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1; |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 97 | |
| 98 | /* Find device with specified name */ |
Ying Xue | 2537af9 | 2013-06-17 10:54:51 -0400 | [diff] [blame] | 99 | dev = dev_get_by_name(&init_net, driver_name); |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 100 | if (!dev) |
| 101 | return -ENODEV; |
| 102 | |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 103 | /* Associate TIPC bearer with InfiniBand bearer */ |
Ying Xue | 37cb062 | 2013-12-10 20:45:41 -0800 | [diff] [blame] | 104 | tb_ptr->dev = dev; |
Ying Xue | 6e967ad | 2013-12-10 20:45:42 -0800 | [diff] [blame^] | 105 | tb_ptr->usr_handle = NULL; |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 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; |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 111 | ib_media_addr_set(tb_ptr, &tb_ptr->addr, (char *)dev->dev_addr); |
Ying Xue | 37cb062 | 2013-12-10 20:45:41 -0800 | [diff] [blame] | 112 | rcu_assign_pointer(dev->tipc_ptr, tb_ptr); |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | /** |
Ying Xue | 4babbaa | 2013-10-18 07:23:17 +0200 | [diff] [blame] | 117 | * disable_media - detach TIPC bearer from an InfiniBand interface |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 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 | */ |
Ying Xue | 4babbaa | 2013-10-18 07:23:17 +0200 | [diff] [blame] | 123 | static void disable_media(struct tipc_bearer *tb_ptr) |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 124 | { |
Ying Xue | 37cb062 | 2013-12-10 20:45:41 -0800 | [diff] [blame] | 125 | RCU_INIT_POINTER(tb_ptr->dev->tipc_ptr, NULL); |
Ying Xue | 6e967ad | 2013-12-10 20:45:42 -0800 | [diff] [blame^] | 126 | dev_put(tb_ptr->dev); |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | /** |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 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 | |
Andy Shevchenko | d77e41e | 2013-07-10 17:30:34 +0300 | [diff] [blame] | 137 | sprintf(str_buf, "%20phC", a->value); |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 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 | */ |
Jon Paul Maloy | 5702dba | 2013-12-10 20:45:39 -0800 | [diff] [blame] | 166 | struct tipc_media ib_media_info = { |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 167 | .send_msg = send_msg, |
Ying Xue | 4babbaa | 2013-10-18 07:23:17 +0200 | [diff] [blame] | 168 | .enable_media = enable_media, |
| 169 | .disable_media = disable_media, |
Patrick McHardy | a29a194 | 2013-04-17 06:18:28 +0000 | [diff] [blame] | 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 | |