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    Subject[PATCH 5.7 091/166] IB/mlx5: Fix 50G per lane indication
    Date
    From: Aya Levin <ayal@mellanox.com>

    [ Upstream commit 530c8632b547ff72f11ff83654b22462a73f1f7b ]

    Some released FW versions mistakenly don't set the capability that 50G per
    lane link-modes are supported for VFs (ptys_extended_ethernet capability
    bit).

    Use PTYS.ext_eth_proto_capability instead, as this indication is always
    accurate. If PTYS.ext_eth_proto_capability is valid
    (has a non-zero value) conclude that the HCA supports 50G per lane.

    Otherwise, conclude that the HCA doesn't support 50G per lane.

    Fixes: 08e8676f1607 ("IB/mlx5: Add support for 50Gbps per lane link modes")
    Link: https://lore.kernel.org/r/20200707110612.882962-3-leon@kernel.org
    Signed-off-by: Aya Levin <ayal@mellanox.com>
    Reviewed-by: Eran Ben Elisha <eranbe@mellanox.com>
    Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
    Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
    Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/infiniband/hw/mlx5/main.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
    index 6679756506e60..820e407b3e260 100644
    --- a/drivers/infiniband/hw/mlx5/main.c
    +++ b/drivers/infiniband/hw/mlx5/main.c
    @@ -515,7 +515,7 @@ static int mlx5_query_port_roce(struct ib_device *device, u8 port_num,
    mdev_port_num);
    if (err)
    goto out;
    - ext = MLX5_CAP_PCAM_FEATURE(dev->mdev, ptys_extended_ethernet);
    + ext = !!MLX5_GET_ETH_PROTO(ptys_reg, out, true, eth_proto_capability);
    eth_prot_oper = MLX5_GET_ETH_PROTO(ptys_reg, out, ext, eth_proto_oper);

    props->active_width = IB_WIDTH_4X;
    --
    2.25.1


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