diff options
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_main.c | 229 |
1 files changed, 228 insertions, 1 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index cca1a0c91ec4..36536ce5a3e2 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -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); |