linux/net/tipc/ib_media.c

373 lines
10 KiB
C

/*
* 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_MEDIA MAX_BEARERS
/**
* struct ib_media - Infiniband media 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_media {
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_media ib_media_array[MAX_IB_MEDIA];
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_media *)(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_media *ib_ptr = (struct ib_media *)pt->af_packet_priv;
if (!net_eq(dev_net(dev), &init_net)) {
kfree_skb(buf);
return NET_RX_DROP;
}
if (likely(ib_ptr->bearer)) {
if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
buf->next = NULL;
tipc_recv_msg(buf, ib_ptr->bearer);
return NET_RX_SUCCESS;
}
}
kfree_skb(buf);
return NET_RX_DROP;
}
/**
* setup_bearer - setup association between InfiniBand bearer and interface
*/
static void setup_media(struct work_struct *work)
{
struct ib_media *ib_ptr =
container_of(work, struct ib_media, setup);
dev_add_pack(&ib_ptr->tipc_packet_type);
}
/**
* enable_media - attach TIPC bearer to an InfiniBand interface
*/
static int enable_media(struct tipc_bearer *tb_ptr)
{
struct net_device *dev;
struct ib_media *ib_ptr = &ib_media_array[0];
struct ib_media *stop = &ib_media_array[MAX_IB_MEDIA];
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 */
dev = dev_get_by_name(&init_net, driver_name);
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_media);
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_media *ib_ptr =
container_of(work, struct ib_media, cleanup);
dev_remove_pack(&ib_ptr->tipc_packet_type);
dev_put(ib_ptr->dev);
ib_ptr->dev = NULL;
}
/**
* 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)
{
struct ib_media *ib_ptr = (struct ib_media *)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 *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct ib_media *ib_ptr = &ib_media_array[0];
struct ib_media *stop = &ib_media_array[MAX_IB_MEDIA];
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);
break;
case NETDEV_UP:
tipc_continue(ib_ptr->bearer);
break;
case NETDEV_DOWN:
tipc_block_bearer(ib_ptr->bearer);
break;
case NETDEV_CHANGEMTU:
case NETDEV_CHANGEADDR:
tipc_block_bearer(ib_ptr->bearer);
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, "%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
*/
static 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"
};
/**
* 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(&notifier);
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(&notifier);
ib_started = 0;
}