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Message-Id: <20210315135740.801267679@linuxfoundation.org>
Date: Mon, 15 Mar 2021 14:56:46 +0100
From: gregkh@...uxfoundation.org
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, "Kevin(Yudong) Yang" <yyd@...gle.com>,
Eric Dumazet <edumazet@...gle.com>,
Neal Cardwell <ncardwell@...gle.com>,
Tariq Toukan <tariqt@...dia.com>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.14 16/95] net/mlx4_en: update moderation when config reset
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
From: Kevin(Yudong) Yang <yyd@...gle.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@...gle.com>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
Reviewed-by: Neal Cardwell <ncardwell@...gle.com>
CC: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -3673,6 +3673,8 @@ 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
@@ -789,6 +789,7 @@ 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);
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