The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From db7a691a1551a748cb92d9c89c6b190ea87e28d5 Mon Sep 17 00:00:00 2001

From: Michael Guralnik michaelgur@mellanox.com Date: Wed, 21 Nov 2018 15:03:54 +0200 Subject: [PATCH] IB/mlx5: Avoid load failure due to unknown link width

If the firmware reports a connection width that is not 1x, 4x, 8x or 12x it causes the driver to fail during initialization.

To prevent this failure every time a new width is introduced to the RDMA stack, we will set a default 4x width for these widths which ar unknown to the driver.

This is needed to allow to run old kernels with new firmware.

Cc: stable@vger.kernel.org # 4.1 Fixes: 1b5daf11b015 ("IB/mlx5: Avoid using the MAD_IFC command under ISSI > 0 mode") Signed-off-by: Michael Guralnik michaelgur@mellanox.com Reviewed-by: Majd Dibbiny majd@mellanox.com Signed-off-by: Leon Romanovsky leonro@mellanox.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c index e9c428071df3..3569fda07e07 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -1094,31 +1094,26 @@ enum mlx5_ib_width { MLX5_IB_WIDTH_12X = 1 << 4 };

-static int translate_active_width(struct ib_device *ibdev, u8 active_width, +static void translate_active_width(struct ib_device *ibdev, u8 active_width, u8 *ib_width) { struct mlx5_ib_dev *dev = to_mdev(ibdev); - int err = 0;

- if (active_width & MLX5_IB_WIDTH_1X) { + if (active_width & MLX5_IB_WIDTH_1X) *ib_width = IB_WIDTH_1X; - } else if (active_width & MLX5_IB_WIDTH_2X) { - mlx5_ib_dbg(dev, "active_width %d is not supported by IB spec\n", - (int)active_width); - err = -EINVAL; - } else if (active_width & MLX5_IB_WIDTH_4X) { + else if (active_width & MLX5_IB_WIDTH_4X) *ib_width = IB_WIDTH_4X; - } else if (active_width & MLX5_IB_WIDTH_8X) { + else if (active_width & MLX5_IB_WIDTH_8X) *ib_width = IB_WIDTH_8X; - } else if (active_width & MLX5_IB_WIDTH_12X) { + else if (active_width & MLX5_IB_WIDTH_12X) *ib_width = IB_WIDTH_12X; - } else { - mlx5_ib_dbg(dev, "Invalid active_width %d\n", + else { + mlx5_ib_dbg(dev, "Invalid active_width %d, setting width to default value: 4x\n", (int)active_width); - err = -EINVAL; + *ib_width = IB_WIDTH_4X; }

- return err; + return; }

static int mlx5_mtu_to_ib_mtu(int mtu) @@ -1225,10 +1220,8 @@ static int mlx5_query_hca_port(struct ib_device *ibdev, u8 port, if (err) goto out;

- err = translate_active_width(ibdev, ib_link_width_oper, - &props->active_width); - if (err) - goto out; + translate_active_width(ibdev, ib_link_width_oper, &props->active_width); + err = mlx5_query_port_ib_proto_oper(mdev, &props->active_speed, port); if (err) goto out;