[PATCH for >= 3.14 3/5] IB/mlx4: Fix wrong usage of IPv4 protocol for multicast attach/detach

[Or Gerlitz]

commit e9a7faf11af94957e5107b40af46c2e329541510 upstream.

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 <cls...@linux.vnet.ibm.com>
Signed-off-by: Or Gerlitz <ogerl...@mellanox.com>
Signed-off-by: Roland Dreier <rol...@purestorage.com>
---
 drivers/infiniband/hw/mlx4/main.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/infiniband/hw/mlx4/main.c 
b/drivers/infiniband/hw/mlx4/main.c
index 9117b7a..0b280b1 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) {
-- 
1.7.1

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