From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Kevin(Yudong) Yang yyd@google.com
commit 00ff801bb8ce6711e919af4530b6ffa14a22390a upstream.
This patch fixes a bug that the moderation config will not be applied when calling mlx4_en_reset_config. For example, when turning on rx timestamping, mlx4_en_reset_config() will be called, causing the NIC to forget previous moderation config.
This fix is in phase with a previous fix: commit 79c54b6bbf06 ("net/mlx4_en: Fix TX moderation info loss after set_ringparam is called")
Tested: Before this patch, on a host with NIC using mlx4, run netserver and stream TCP to the host at full utilization. $ sar -I SUM 1 INTR intr/s 14:03:56 sum 48758.00
After rx hwtstamp is enabled: $ sar -I SUM 1 14:10:38 sum 317771.00 We see the moderation is not working properly and issued 7x more interrupts.
After the patch, and turned on rx hwtstamp, the rate of interrupts is as expected: $ sar -I SUM 1 14:52:11 sum 49332.00
Fixes: 79c54b6bbf06 ("net/mlx4_en: Fix TX moderation info loss after set_ringparam is called") Signed-off-by: Kevin(Yudong) Yang yyd@google.com Reviewed-by: Eric Dumazet edumazet@google.com Reviewed-by: Neal Cardwell ncardwell@google.com CC: Tariq Toukan tariqt@nvidia.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/mellanox/mlx4/en_ethtool.c | 2 +- drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 2 ++ drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 1 + 3 files changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c @@ -47,7 +47,7 @@ #define EN_ETHTOOL_SHORT_MASK cpu_to_be16(0xffff) #define EN_ETHTOOL_WORD_MASK cpu_to_be32(0xffffffff)
-static int mlx4_en_moderation_update(struct mlx4_en_priv *priv) +int mlx4_en_moderation_update(struct mlx4_en_priv *priv) { int i, t; int err = 0; --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c @@ -3657,6 +3657,8 @@ int mlx4_en_reset_config(struct net_devi en_err(priv, "Failed starting port\n"); }
+ if (!err) + err = mlx4_en_moderation_update(priv); out: mutex_unlock(&mdev->state_lock); kfree(tmp); --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h @@ -797,6 +797,7 @@ void mlx4_en_ptp_overflow_check(struct m #define DEV_FEATURE_CHANGED(dev, new_features, feature) \ ((dev->features & feature) ^ (new_features & feature))
+int mlx4_en_moderation_update(struct mlx4_en_priv *priv); int mlx4_en_reset_config(struct net_device *dev, struct hwtstamp_config ts_config, netdev_features_t new_features);