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net/mlx5e: Update and set Xon/Xoff upon MTU set

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Xon/Xoff sizes are derived from calculation that include the MTU size.
Set Xon/Xoff when MTU is set.
If Xon/Xoff fails, set the previous MTU.

Fixes: 0696d60853 ("net/mlx5e: Receive buffer configuration")
Signed-off-by: Alexei Lazar <alazar@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Link: https://patch.msgid.link/20250825143435.598584-10-mbloch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Alexei Lazar 2025-08-25 17:34:32 +03:00 committed by Jakub Kicinski
parent cf9a8627b9
commit ceddedc969
2 changed files with 28 additions and 1 deletions
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12
drivers/net/ethernet/mellanox/mlx5/core/en/port_buffer.h
View File

@ -66,11 +66,23 @@ struct mlx5e_port_buffer {
struct mlx5e_bufferx_reg buffer[MLX5E_MAX_NETWORK_BUFFER];
};
#ifdef CONFIG_MLX5_CORE_EN_DCB
int mlx5e_port_manual_buffer_config(struct mlx5e_priv *priv,
u32 change, unsigned int mtu,
struct ieee_pfc *pfc,
u32 *buffer_size,
u8 *prio2buffer);
#else
static inline int
mlx5e_port_manual_buffer_config(struct mlx5e_priv *priv,
u32 change, unsigned int mtu,
void *pfc,
u32 *buffer_size,
u8 *prio2buffer)
{
return 0;
}
#endif
int mlx5e_port_query_buffer(struct mlx5e_priv *priv,
struct mlx5e_port_buffer *port_buffer);

17
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@ -49,6 +49,7 @@
#include "en.h"
#include "en/dim.h"
#include "en/txrx.h"
#include "en/port_buffer.h"
#include "en_tc.h"
#include "en_rep.h"
#include "en_accel/ipsec.h"
@ -3040,9 +3041,11 @@ int mlx5e_set_dev_port_mtu(struct mlx5e_priv *priv)
struct mlx5e_params *params = &priv->channels.params;
struct net_device *netdev = priv->netdev;
struct mlx5_core_dev *mdev = priv->mdev;
u16 mtu;
u16 mtu, prev_mtu;
int err;
mlx5e_query_mtu(mdev, params, &prev_mtu);
err = mlx5e_set_mtu(mdev, params, params->sw_mtu);
if (err)
return err;
@ -3052,6 +3055,18 @@ int mlx5e_set_dev_port_mtu(struct mlx5e_priv *priv)
netdev_warn(netdev, "%s: VPort MTU %d is different than netdev mtu %d\n",
__func__, mtu, params->sw_mtu);
if (mtu != prev_mtu && MLX5_BUFFER_SUPPORTED(mdev)) {
err = mlx5e_port_manual_buffer_config(priv, 0, mtu,
NULL, NULL, NULL);
if (err) {
netdev_warn(netdev, "%s: Failed to set Xon/Xoff values with MTU %d (err %d), setting back to previous MTU %d\n",
__func__, mtu, err, prev_mtu);
mlx5e_set_mtu(mdev, params, prev_mtu);
return err;
}
}
params->sw_mtu = mtu;
return 0;
}