net/mlx5e: Query global pause state before setting prio2buffer
[ Upstream commit73e6551699
] When the user changes prio2buffer mapping while global pause is enabled, mlx5 driver incorrectly sets all active buffers (buffer that has at least one priority mapped) to lossy. Solution: If global pause is enabled, set all the active buffers to lossless in prio2buffer command. Also, add error message when buffer size is not enough to meet xoff threshold. Fixes:0696d60853
("net/mlx5e: Receive buffer configuration") Signed-off-by: Huy Nguyen <huyn@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -155,8 +155,11 @@ static int update_xoff_threshold(struct mlx5e_port_buffer *port_buffer,
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}
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if (port_buffer->buffer[i].size <
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(xoff + max_mtu + (1 << MLX5E_BUFFER_CELL_SHIFT)))
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(xoff + max_mtu + (1 << MLX5E_BUFFER_CELL_SHIFT))) {
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pr_err("buffer_size[%d]=%d is not enough for lossless buffer\n",
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i, port_buffer->buffer[i].size);
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return -ENOMEM;
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}
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port_buffer->buffer[i].xoff = port_buffer->buffer[i].size - xoff;
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port_buffer->buffer[i].xon =
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@ -232,6 +235,26 @@ static int update_buffer_lossy(unsigned int max_mtu,
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return 0;
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}
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static int fill_pfc_en(struct mlx5_core_dev *mdev, u8 *pfc_en)
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{
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u32 g_rx_pause, g_tx_pause;
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int err;
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err = mlx5_query_port_pause(mdev, &g_rx_pause, &g_tx_pause);
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if (err)
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return err;
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/* If global pause enabled, set all active buffers to lossless.
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* Otherwise, check PFC setting.
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*/
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if (g_rx_pause || g_tx_pause)
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*pfc_en = 0xff;
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else
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err = mlx5_query_port_pfc(mdev, pfc_en, NULL);
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return err;
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}
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#define MINIMUM_MAX_MTU 9216
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int mlx5e_port_manual_buffer_config(struct mlx5e_priv *priv,
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u32 change, unsigned int mtu,
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@ -277,7 +300,7 @@ int mlx5e_port_manual_buffer_config(struct mlx5e_priv *priv,
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if (change & MLX5E_PORT_BUFFER_PRIO2BUFFER) {
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update_prio2buffer = true;
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err = mlx5_query_port_pfc(priv->mdev, &curr_pfc_en, NULL);
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err = fill_pfc_en(priv->mdev, &curr_pfc_en);
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if (err)
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return err;
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