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net/mlx5e: Verify coalescing parameters in range 

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: f62b8bb8f2 ('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>
This commit is contained in:
Moshe Shemesh 2018-02-15 12:41:48 +02:00 committed by Saeed Mahameed
parent f125376b06
commit b392a2078b
1 changed files with 17 additions and 0 deletions
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17
drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
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@ -477,6 +477,9 @@ static int mlx5e_get_coalesce(struct net_device *netdev,
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)
{
@ -511,6 +514,20 @@ int mlx5e_ethtool_set_coalesce(struct mlx5e_priv *priv,
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;