| /* |
| * net/tipc/ib_media.c: Infiniband bearer support for TIPC |
| * |
| * Copyright (c) 2013 Patrick McHardy <kaber@trash.net> |
| * |
| * Based on eth_media.c, which carries the following copyright notice: |
| * |
| * Copyright (c) 2001-2007, Ericsson AB |
| * Copyright (c) 2005-2008, 2011, Wind River Systems |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the names of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <linux/if_infiniband.h> |
| #include "core.h" |
| #include "bearer.h" |
| |
| /** |
| * ib_media_addr_set - initialize Infiniband media address structure |
| * |
| * Media-dependent "value" field stores MAC address in first 6 bytes |
| * and zeroes out the remaining bytes. |
| */ |
| static void ib_media_addr_set(const struct tipc_bearer *tb_ptr, |
| struct tipc_media_addr *a, char *mac) |
| { |
| BUILD_BUG_ON(sizeof(a->value) < INFINIBAND_ALEN); |
| memcpy(a->value, mac, INFINIBAND_ALEN); |
| a->media_id = TIPC_MEDIA_TYPE_IB; |
| a->broadcast = !memcmp(mac, tb_ptr->bcast_addr.value, INFINIBAND_ALEN); |
| } |
| |
| /** |
| * send_msg - send a TIPC message out over an InfiniBand interface |
| */ |
| static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr, |
| struct tipc_media_addr *dest) |
| { |
| struct sk_buff *clone; |
| int delta; |
| struct net_device *dev = tb_ptr->dev; |
| |
| clone = skb_clone(buf, GFP_ATOMIC); |
| if (!clone) |
| return 0; |
| |
| delta = dev->hard_header_len - skb_headroom(buf); |
| if ((delta > 0) && |
| pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { |
| kfree_skb(clone); |
| return 0; |
| } |
| |
| skb_reset_network_header(clone); |
| clone->dev = dev; |
| clone->protocol = htons(ETH_P_TIPC); |
| dev_hard_header(clone, dev, ETH_P_TIPC, dest->value, |
| dev->dev_addr, clone->len); |
| dev_queue_xmit(clone); |
| return 0; |
| } |
| |
| /** |
| * enable_media - attach TIPC bearer to an InfiniBand interface |
| */ |
| static int enable_media(struct tipc_bearer *tb_ptr) |
| { |
| struct net_device *dev; |
| char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1; |
| |
| /* Find device with specified name */ |
| dev = dev_get_by_name(&init_net, driver_name); |
| if (!dev) |
| return -ENODEV; |
| |
| /* Associate TIPC bearer with InfiniBand bearer */ |
| tb_ptr->dev = dev; |
| tb_ptr->usr_handle = NULL; |
| memset(tb_ptr->bcast_addr.value, 0, sizeof(tb_ptr->bcast_addr.value)); |
| memcpy(tb_ptr->bcast_addr.value, dev->broadcast, INFINIBAND_ALEN); |
| tb_ptr->bcast_addr.media_id = TIPC_MEDIA_TYPE_IB; |
| tb_ptr->bcast_addr.broadcast = 1; |
| tb_ptr->mtu = dev->mtu; |
| ib_media_addr_set(tb_ptr, &tb_ptr->addr, (char *)dev->dev_addr); |
| rcu_assign_pointer(dev->tipc_ptr, tb_ptr); |
| return 0; |
| } |
| |
| /** |
| * disable_media - detach TIPC bearer from an InfiniBand interface |
| * |
| * Mark InfiniBand bearer as inactive so that incoming buffers are thrown away, |
| * then get worker thread to complete bearer cleanup. (Can't do cleanup |
| * here because cleanup code needs to sleep and caller holds spinlocks.) |
| */ |
| static void disable_media(struct tipc_bearer *tb_ptr) |
| { |
| RCU_INIT_POINTER(tb_ptr->dev->tipc_ptr, NULL); |
| dev_put(tb_ptr->dev); |
| } |
| |
| /** |
| * ib_addr2str - convert InfiniBand address to string |
| */ |
| static int ib_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size) |
| { |
| if (str_size < 60) /* 60 = 19 * strlen("xx:") + strlen("xx\0") */ |
| return 1; |
| |
| sprintf(str_buf, "%20phC", a->value); |
| |
| return 0; |
| } |
| |
| /** |
| * ib_addr2msg - convert InfiniBand address format to message header format |
| */ |
| static int ib_addr2msg(struct tipc_media_addr *a, char *msg_area) |
| { |
| memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE); |
| msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_IB; |
| memcpy(msg_area, a->value, INFINIBAND_ALEN); |
| return 0; |
| } |
| |
| /** |
| * ib_msg2addr - convert message header address format to InfiniBand format |
| */ |
| static int ib_msg2addr(const struct tipc_bearer *tb_ptr, |
| struct tipc_media_addr *a, char *msg_area) |
| { |
| ib_media_addr_set(tb_ptr, a, msg_area); |
| return 0; |
| } |
| |
| /* |
| * InfiniBand media registration info |
| */ |
| struct tipc_media ib_media_info = { |
| .send_msg = send_msg, |
| .enable_media = enable_media, |
| .disable_media = disable_media, |
| .addr2str = ib_addr2str, |
| .addr2msg = ib_addr2msg, |
| .msg2addr = ib_msg2addr, |
| .priority = TIPC_DEF_LINK_PRI, |
| .tolerance = TIPC_DEF_LINK_TOL, |
| .window = TIPC_DEF_LINK_WIN, |
| .type_id = TIPC_MEDIA_TYPE_IB, |
| .name = "ib" |
| }; |
| |