Re: [PATCH] IB/mlx4: Fix wrong usage of IPv4 protocol for multicast attach/detach

[Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>]

On 12/17/2014 9:17 AM, Or Gerlitz wrote:
> 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-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
> Signed-off-by: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> ---

Roland, you missed picking this one (was sent to you whole two months 
ago) for 3.19 and meanwhile some code went into mlx4 from the net-next 
tree which will cause a small collision here. I am traveling now and 
can't send you the revised patch but it should be very easy to generate, 
just 1-2 lines added. I would suggest for you to rebase against Dave's 
net tree or Linus tree, you should also see it from 0-days builds if you 
wait few hours.
>   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 e861330..ea69975 100644
> --- a/drivers/infiniband/hw/mlx4/main.c
> +++ b/drivers/infiniband/hw/mlx4/main.c
> @@ -1221,8 +1221,7 @@ 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) {
> @@ -1235,8 +1234,10 @@ 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)
> @@ -1284,8 +1285,7 @@ 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) {

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