IB/mlx4: Fix wrong usage of IPv4 protocol for multicast attach/detach

The MLX4_PROT_IB_IPV4 protocol should only be used with RoCEv2 and such.
Removing this wrong usage allows to run multicast applications over RoCE.

Fixes: d487ee77740c ("IB/mlx4: Use IBoE (RoCE) IP based GIDs in the port GID table")
Reported-by: Carol Soto <clsoto@linux.vnet.ibm.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index 9117b7a2d5f8..0b280b1c98df 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -1222,8 +1222,7 @@ static int mlx4_ib_mcg_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
         struct mlx4_ib_qp *mqp = to_mqp(ibqp);
         u64 reg_id;
         struct mlx4_ib_steering *ib_steering = NULL;
-        enum mlx4_protocol prot = (gid->raw[1] == 0x0e) ?
-                MLX4_PROT_IB_IPV4 : MLX4_PROT_IB_IPV6;
+        enum mlx4_protocol prot = MLX4_PROT_IB_IPV6;
 
         if (mdev->dev->caps.steering_mode ==
             MLX4_STEERING_MODE_DEVICE_MANAGED) {
@@ -1236,8 +1235,10 @@ static int mlx4_ib_mcg_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
                                     !!(mqp->flags &
                                        MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK),
                                     prot, &reg_id);
-        if (err)
+        if (err) {
+                pr_err("multicast attach op failed, err %d\n", err);
                 goto err_malloc;
+        }
 
         err = add_gid_entry(ibqp, gid);
         if (err)
@@ -1285,8 +1286,7 @@ static int mlx4_ib_mcg_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
         struct net_device *ndev;
         struct mlx4_ib_gid_entry *ge;
         u64 reg_id = 0;
-        enum mlx4_protocol prot = (gid->raw[1] == 0x0e) ?
-                MLX4_PROT_IB_IPV4 : MLX4_PROT_IB_IPV6;
+        enum mlx4_protocol prot =  MLX4_PROT_IB_IPV6;
 
         if (mdev->dev->caps.steering_mode ==
             MLX4_STEERING_MODE_DEVICE_MANAGED) {