diff options
Diffstat (limited to 'net/tipc/ib_media.c')
| -rw-r--r-- | net/tipc/ib_media.c | 387 |
1 files changed, 387 insertions, 0 deletions
diff --git a/net/tipc/ib_media.c b/net/tipc/ib_media.c new file mode 100644 index 000000000000..2a2864c25e15 --- /dev/null +++ b/net/tipc/ib_media.c @@ -0,0 +1,387 @@ +/* + * 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" + +#define MAX_IB_BEARERS MAX_BEARERS + +/** + * struct ib_bearer - Infiniband bearer data structure + * @bearer: ptr to associated "generic" bearer structure + * @dev: ptr to associated Infiniband network device + * @tipc_packet_type: used in binding TIPC to Infiniband driver + * @cleanup: work item used when disabling bearer + */ + +struct ib_bearer { + struct tipc_bearer *bearer; + struct net_device *dev; + struct packet_type tipc_packet_type; + struct work_struct setup; + struct work_struct cleanup; +}; + +static struct tipc_media ib_media_info; +static struct ib_bearer ib_bearers[MAX_IB_BEARERS]; +static int ib_started; + +/** + * 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; + struct net_device *dev; + int delta; + + clone = skb_clone(buf, GFP_ATOMIC); + if (!clone) + return 0; + + dev = ((struct ib_bearer *)(tb_ptr->usr_handle))->dev; + 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; +} + +/** + * recv_msg - handle incoming TIPC message from an InfiniBand interface + * + * Accept only packets explicitly sent to this node, or broadcast packets; + * ignores packets sent using InfiniBand multicast, and traffic sent to other + * nodes (which can happen if interface is running in promiscuous mode). + */ +static int recv_msg(struct sk_buff *buf, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev) +{ + struct ib_bearer *ib_ptr = (struct ib_bearer *)pt->af_packet_priv; + + if (!net_eq(dev_net(dev), &init_net)) { + kfree_skb(buf); + return 0; + } + + if (likely(ib_ptr->bearer)) { + if (likely(buf->pkt_type <= PACKET_BROADCAST)) { + buf->next = NULL; + tipc_recv_msg(buf, ib_ptr->bearer); + return 0; + } + } + kfree_skb(buf); + return 0; +} + +/** + * setup_bearer - setup association between InfiniBand bearer and interface + */ +static void setup_bearer(struct work_struct *work) +{ + struct ib_bearer *ib_ptr = + container_of(work, struct ib_bearer, setup); + + dev_add_pack(&ib_ptr->tipc_packet_type); +} + +/** + * enable_bearer - attach TIPC bearer to an InfiniBand interface + */ +static int enable_bearer(struct tipc_bearer *tb_ptr) +{ + struct net_device *dev = NULL; + struct net_device *pdev = NULL; + struct ib_bearer *ib_ptr = &ib_bearers[0]; + struct ib_bearer *stop = &ib_bearers[MAX_IB_BEARERS]; + char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1; + int pending_dev = 0; + + /* Find unused InfiniBand bearer structure */ + while (ib_ptr->dev) { + if (!ib_ptr->bearer) + pending_dev++; + if (++ib_ptr == stop) + return pending_dev ? -EAGAIN : -EDQUOT; + } + + /* Find device with specified name */ + read_lock(&dev_base_lock); + for_each_netdev(&init_net, pdev) { + if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) { + dev = pdev; + dev_hold(dev); + break; + } + } + read_unlock(&dev_base_lock); + if (!dev) + return -ENODEV; + + /* Create InfiniBand bearer for device */ + ib_ptr->dev = dev; + ib_ptr->tipc_packet_type.type = htons(ETH_P_TIPC); + ib_ptr->tipc_packet_type.dev = dev; + ib_ptr->tipc_packet_type.func = recv_msg; + ib_ptr->tipc_packet_type.af_packet_priv = ib_ptr; + INIT_LIST_HEAD(&(ib_ptr->tipc_packet_type.list)); + INIT_WORK(&ib_ptr->setup, setup_bearer); + schedule_work(&ib_ptr->setup); + + /* Associate TIPC bearer with InfiniBand bearer */ + ib_ptr->bearer = tb_ptr; + tb_ptr->usr_handle = (void *)ib_ptr; + 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; + tb_ptr->blocked = 0; + ib_media_addr_set(tb_ptr, &tb_ptr->addr, (char *)dev->dev_addr); + return 0; +} + +/** + * cleanup_bearer - break association between InfiniBand bearer and interface + * + * This routine must be invoked from a work queue because it can sleep. + */ +static void cleanup_bearer(struct work_struct *work) +{ + struct ib_bearer *ib_ptr = + container_of(work, struct ib_bearer, cleanup); + + dev_remove_pack(&ib_ptr->tipc_packet_type); + dev_put(ib_ptr->dev); + ib_ptr->dev = NULL; +} + +/** + * disable_bearer - 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_bearer(struct tipc_bearer *tb_ptr) +{ + struct ib_bearer *ib_ptr = (struct ib_bearer *)tb_ptr->usr_handle; + + ib_ptr->bearer = NULL; + INIT_WORK(&ib_ptr->cleanup, cleanup_bearer); + schedule_work(&ib_ptr->cleanup); +} + +/** + * recv_notification - handle device updates from OS + * + * Change the state of the InfiniBand bearer (if any) associated with the + * specified device. + */ +static int recv_notification(struct notifier_block *nb, unsigned long evt, + void *dv) +{ + struct net_device *dev = (struct net_device *)dv; + struct ib_bearer *ib_ptr = &ib_bearers[0]; + struct ib_bearer *stop = &ib_bearers[MAX_IB_BEARERS]; + + if (!net_eq(dev_net(dev), &init_net)) + return NOTIFY_DONE; + + while ((ib_ptr->dev != dev)) { + if (++ib_ptr == stop) + return NOTIFY_DONE; /* couldn't find device */ + } + if (!ib_ptr->bearer) + return NOTIFY_DONE; /* bearer had been disabled */ + + ib_ptr->bearer->mtu = dev->mtu; + + switch (evt) { + case NETDEV_CHANGE: + if (netif_carrier_ok(dev)) + tipc_continue(ib_ptr->bearer); + else + tipc_block_bearer(ib_ptr->bearer->name); + break; + case NETDEV_UP: + tipc_continue(ib_ptr->bearer); + break; + case NETDEV_DOWN: + tipc_block_bearer(ib_ptr->bearer->name); + break; + case NETDEV_CHANGEMTU: + case NETDEV_CHANGEADDR: + tipc_block_bearer(ib_ptr->bearer->name); + tipc_continue(ib_ptr->bearer); + break; + case NETDEV_UNREGISTER: + case NETDEV_CHANGENAME: + tipc_disable_bearer(ib_ptr->bearer->name); + break; + } + return NOTIFY_OK; +} + +static struct notifier_block notifier = { + .notifier_call = recv_notification, + .priority = 0, +}; + +/** + * 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, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:" + "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x", + a->value[0], a->value[1], a->value[2], a->value[3], + a->value[4], a->value[5], a->value[6], a->value[7], + a->value[8], a->value[9], a->value[10], a->value[11], + a->value[12], a->value[13], a->value[14], a->value[15], + a->value[16], a->value[17], a->value[18], a->value[19]); + + 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 + */ +static struct tipc_media ib_media_info = { + .send_msg = send_msg, + .enable_bearer = enable_bearer, + .disable_bearer = disable_bearer, + .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" +}; + +/** + * tipc_ib_media_start - activate InfiniBand bearer support + * + * Register InfiniBand media type with TIPC bearer code. Also register + * with OS for notifications about device state changes. + */ +int tipc_ib_media_start(void) +{ + int res; + + if (ib_started) + return -EINVAL; + + res = tipc_register_media(&ib_media_info); + if (res) + return res; + + res = register_netdevice_notifier(¬ifier); + if (!res) + ib_started = 1; + return res; +} + +/** + * tipc_ib_media_stop - deactivate InfiniBand bearer support + */ +void tipc_ib_media_stop(void) +{ + if (!ib_started) + return; + + flush_scheduled_work(); + unregister_netdevice_notifier(¬ifier); + ib_started = 0; +} |