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IB/ipoib: Return IPoIB devices matching connection parameters

Implement the get_net_device_by_port_pkey_ip callback that returns network
device to ib_core according to connection parameters. Check the ipoib
device and iterate over all child devices to look for a match.

For each IPoIB device we iterate through all upper devices when searching
for a matching IP, in order to support bonding.

Signed-off-by: Guy Shapiro <guysh@mellanox.com>
Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Yotam Kenneth <yotamke@mellanox.com>
Signed-off-by: Shachar Raindel <raindel@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Guy Shapiro 2015-07-30 17:50:16 +03:00 committed by Doug Ledford
parent 9268f72dcb
commit ddde896e56

View File

@ -48,6 +48,9 @@
#include <linux/jhash.h>
#include <net/arp.h>
#include <net/addrconf.h>
#include <linux/inetdevice.h>
#include <rdma/ib_cache.h>
#define DRV_VERSION "1.0.0"
@ -91,11 +94,16 @@ struct ib_sa_client ipoib_sa_client;
static void ipoib_add_one(struct ib_device *device);
static void ipoib_remove_one(struct ib_device *device, void *client_data);
static void ipoib_neigh_reclaim(struct rcu_head *rp);
static struct net_device *ipoib_get_net_dev_by_params(
struct ib_device *dev, u8 port, u16 pkey,
const union ib_gid *gid, const struct sockaddr *addr,
void *client_data);
static struct ib_client ipoib_client = {
.name = "ipoib",
.add = ipoib_add_one,
.remove = ipoib_remove_one
.remove = ipoib_remove_one,
.get_net_dev_by_params = ipoib_get_net_dev_by_params,
};
int ipoib_open(struct net_device *dev)
@ -222,6 +230,225 @@ static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}
/* Called with an RCU read lock taken */
static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
struct net_device *dev)
{
struct net *net = dev_net(dev);
struct in_device *in_dev;
struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
__be32 ret_addr;
switch (addr->sa_family) {
case AF_INET:
in_dev = in_dev_get(dev);
if (!in_dev)
return false;
ret_addr = inet_confirm_addr(net, in_dev, 0,
addr_in->sin_addr.s_addr,
RT_SCOPE_HOST);
in_dev_put(in_dev);
if (ret_addr)
return true;
break;
case AF_INET6:
if (IS_ENABLED(CONFIG_IPV6) &&
ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
return true;
break;
}
return false;
}
/**
* Find the master net_device on top of the given net_device.
* @dev: base IPoIB net_device
*
* Returns the master net_device with a reference held, or the same net_device
* if no master exists.
*/
static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
{
struct net_device *master;
rcu_read_lock();
master = netdev_master_upper_dev_get_rcu(dev);
if (master)
dev_hold(master);
rcu_read_unlock();
if (master)
return master;
dev_hold(dev);
return dev;
}
/**
* Find a net_device matching the given address, which is an upper device of
* the given net_device.
* @addr: IP address to look for.
* @dev: base IPoIB net_device
*
* If found, returns the net_device with a reference held. Otherwise return
* NULL.
*/
static struct net_device *ipoib_get_net_dev_match_addr(
const struct sockaddr *addr, struct net_device *dev)
{
struct net_device *upper,
*result = NULL;
struct list_head *iter;
rcu_read_lock();
if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
dev_hold(dev);
result = dev;
goto out;
}
netdev_for_each_all_upper_dev_rcu(dev, upper, iter) {
if (ipoib_is_dev_match_addr_rcu(addr, upper)) {
dev_hold(upper);
result = upper;
break;
}
}
out:
rcu_read_unlock();
return result;
}
/* returns the number of IPoIB netdevs on top a given ipoib device matching a
* pkey_index and address, if one exists.
*
* @found_net_dev: contains a matching net_device if the return value >= 1,
* with a reference held. */
static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
const union ib_gid *gid,
u16 pkey_index,
const struct sockaddr *addr,
int nesting,
struct net_device **found_net_dev)
{
struct ipoib_dev_priv *child_priv;
struct net_device *net_dev = NULL;
int matches = 0;
if (priv->pkey_index == pkey_index &&
(!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
if (!addr) {
net_dev = ipoib_get_master_net_dev(priv->dev);
} else {
/* Verify the net_device matches the IP address, as
* IPoIB child devices currently share a GID. */
net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
}
if (net_dev) {
if (!*found_net_dev)
*found_net_dev = net_dev;
else
dev_put(net_dev);
++matches;
}
}
/* Check child interfaces */
down_read_nested(&priv->vlan_rwsem, nesting);
list_for_each_entry(child_priv, &priv->child_intfs, list) {
matches += ipoib_match_gid_pkey_addr(child_priv, gid,
pkey_index, addr,
nesting + 1,
found_net_dev);
if (matches > 1)
break;
}
up_read(&priv->vlan_rwsem);
return matches;
}
/* Returns the number of matching net_devs found (between 0 and 2). Also
* return the matching net_device in the @net_dev parameter, holding a
* reference to the net_device, if the number of matches >= 1 */
static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
u16 pkey_index,
const union ib_gid *gid,
const struct sockaddr *addr,
struct net_device **net_dev)
{
struct ipoib_dev_priv *priv;
int matches = 0;
*net_dev = NULL;
list_for_each_entry(priv, dev_list, list) {
if (priv->port != port)
continue;
matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
addr, 0, net_dev);
if (matches > 1)
break;
}
return matches;
}
static struct net_device *ipoib_get_net_dev_by_params(
struct ib_device *dev, u8 port, u16 pkey,
const union ib_gid *gid, const struct sockaddr *addr,
void *client_data)
{
struct net_device *net_dev;
struct list_head *dev_list = client_data;
u16 pkey_index;
int matches;
int ret;
if (!rdma_protocol_ib(dev, port))
return NULL;
ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
if (ret)
return NULL;
if (!dev_list)
return NULL;
/* See if we can find a unique device matching the L2 parameters */
matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
gid, NULL, &net_dev);
switch (matches) {
case 0:
return NULL;
case 1:
return net_dev;
}
dev_put(net_dev);
/* Couldn't find a unique device with L2 parameters only. Use L3
* address to uniquely match the net device */
matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
gid, addr, &net_dev);
switch (matches) {
case 0:
return NULL;
default:
dev_warn_ratelimited(&dev->dev,
"duplicate IP address detected\n");
/* Fall through */
case 1:
return net_dev;
}
}
int ipoib_set_mode(struct net_device *dev, const char *buf)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);