From ee3572409f74a838154af74ce1e56e62c17786a8 Mon Sep 17 00:00:00 2001 From: Carolina Jubran Date: Tue, 9 Apr 2024 22:08:14 +0300 Subject: net/mlx5e: RSS, Block changing channels number when RXFH is configured Changing the channels number after configuring the receive flow hash indirection table may affect the RSS table size. The previous configuration may no longer be compatible with the new receive flow hash indirection table. Block changing the channels number when RXFH is configured and changing the channels number requires resizing the RSS table size. Fixes: 74a8dadac17e ("net/mlx5e: Preparations for supporting larger number of channels") Signed-off-by: Carolina Jubran Reviewed-by: Tariq Toukan Signed-off-by: Saeed Mahameed Signed-off-by: Tariq Toukan Link: https://lore.kernel.org/r/20240409190820.227554-7-tariqt@nvidia.com Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c index cc51ce16df14a..93461b0c5703b 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c @@ -451,6 +451,23 @@ int mlx5e_ethtool_set_channels(struct mlx5e_priv *priv, mutex_lock(&priv->state_lock); + /* If RXFH is configured, changing the channels number is allowed only if + * it does not require resizing the RSS table. This is because the previous + * configuration may no longer be compatible with the new RSS table. + */ + if (netif_is_rxfh_configured(priv->netdev)) { + int cur_rqt_size = mlx5e_rqt_size(priv->mdev, cur_params->num_channels); + int new_rqt_size = mlx5e_rqt_size(priv->mdev, count); + + if (new_rqt_size != cur_rqt_size) { + err = -EINVAL; + netdev_err(priv->netdev, + "%s: RXFH is configured, block changing channels number that affects RSS table size (new: %d, current: %d)\n", + __func__, new_rqt_size, cur_rqt_size); + goto out; + } + } + /* Don't allow changing the number of channels if HTB offload is active, * because the numeration of the QoS SQs will change, while per-queue * qdiscs are attached. -- cgit 1.2.3-korg