This is a note to let you know that I've just added the patch titled

net/mlx5e: Verify coalescing parameters in range

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: net-mlx5e-verify-coalescing-parameters-in-range.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Tue Apr 10 23:19:36 CEST 2018

From: Moshe Shemesh moshe@mellanox.com Date: Thu, 15 Feb 2018 12:41:48 +0200 Subject: net/mlx5e: Verify coalescing parameters in range

From: Moshe Shemesh moshe@mellanox.com

[ Upstream commit b392a2078b5e0094ff38aa0c9d2a31b3f607d4ef ]

Add check of coalescing parameters received through ethtool are within range of values supported by the HW. Driver gets the coalescing rx/tx-usecs and rx/tx-frames as set by the users through ethtool. The ethtool support up to 32 bit value for each. However, mlx5 modify cq limits the coalescing time parameter to 12 bit and coalescing frames parameters to 16 bits. Return out of range error if user tries to set these parameters to higher values.

Fixes: f62b8bb8f2d3 ('net/mlx5: Extend mlx5_core to support ConnectX-4 Ethernet functionality') Signed-off-by: Moshe Shemesh moshe@mellanox.com Signed-off-by: Saeed Mahameed saeedm@mellanox.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c @@ -492,6 +492,9 @@ static int mlx5e_get_coalesce(struct net return mlx5e_ethtool_get_coalesce(priv, coal); }

+#define MLX5E_MAX_COAL_TIME MLX5_MAX_CQ_PERIOD +#define MLX5E_MAX_COAL_FRAMES MLX5_MAX_CQ_COUNT + static void mlx5e_set_priv_channels_coalesce(struct mlx5e_priv *priv, struct ethtool_coalesce *coal) { @@ -526,6 +529,20 @@ int mlx5e_ethtool_set_coalesce(struct ml if (!MLX5_CAP_GEN(mdev, cq_moderation)) return -EOPNOTSUPP;

+ if (coal->tx_coalesce_usecs > MLX5E_MAX_COAL_TIME || + coal->rx_coalesce_usecs > MLX5E_MAX_COAL_TIME) { + netdev_info(priv->netdev, "%s: maximum coalesce time supported is %lu usecs\n", + __func__, MLX5E_MAX_COAL_TIME); + return -ERANGE; + } + + if (coal->tx_max_coalesced_frames > MLX5E_MAX_COAL_FRAMES || + coal->rx_max_coalesced_frames > MLX5E_MAX_COAL_FRAMES) { + netdev_info(priv->netdev, "%s: maximum coalesced frames supported is %lu\n", + __func__, MLX5E_MAX_COAL_FRAMES); + return -ERANGE; + } + mutex_lock(&priv->state_lock); new_channels.params = priv->channels.params;

Patches currently in stable-queue which might be from moshe@mellanox.com are

queue-4.15/net-mlx4_core-fix-memory-leak-while-delete-slave-s-resources.patch queue-4.15/net-mlx5e-verify-coalescing-parameters-in-range.patch