IB/mlx4: Don't duplicate the default RoCE GID

When reading the IPv6 addresses from the net-device, make sure to
avoid adding a duplicate entry to the GID table because of equality
between the default GID we generate and the default IPv6 link-local
address of the device.

Fixes: acc4fccf4eff ("IB/mlx4: Make sure GID index 0 is always occupied")
Signed-off-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index bf09d79..16fb232 100644 (file)
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -1679,6 +1679,7 @@ static void mlx4_ib_get_dev_addr(struct net_device *dev,
        struct inet6_dev *in6_dev;
        union ib_gid  *pgid;
        struct inet6_ifaddr *ifp;
+       union ib_gid default_gid;
 #endif
        union ib_gid gid;
 
@@ -1699,12 +1700,15 @@ static void mlx4_ib_get_dev_addr(struct net_device *dev,
                in_dev_put(in_dev);
        }
 #if IS_ENABLED(CONFIG_IPV6)
+       mlx4_make_default_gid(dev, &default_gid);
        /* IPv6 gids */
        in6_dev = in6_dev_get(dev);
        if (in6_dev) {
                read_lock_bh(&in6_dev->lock);
                list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
                        pgid = (union ib_gid *)&ifp->addr;
+                       if (!memcmp(pgid, &default_gid, sizeof(*pgid)))
+                               continue;
                        update_gid_table(ibdev, port, pgid, 0, 0);
                }
                read_unlock_bh(&in6_dev->lock);