net/mlx5e: Use preactivate hook to set the indirection table

[ Upstream commit fe867cac9e1967c553e4ac2aece5fc8675258010 ]

mlx5e_ethtool_set_channels updates the indirection table before
switching to the new channels. If the switch fails, the indirection
table is new, but the channels are old, which is wrong. Fix it by using
the preactivate hook of mlx5e_safe_switch_channels to update the
indirection table at the stage when nothing can fail anymore.

As the code that updates the indirection table is now encapsulated into
a new function, use that function in the attach flow when the driver has
to reduce the number of channels, and prepare the code for the next
commit.

Fixes: 85082dba0a ("net/mlx5e: Correctly handle RSS indirection table when changing number of channels")
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 3cb5b4321bf93eca2ff63430124436691219b5f8..11426f94c90c69bd65f36e33b664dbfa4d789050 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -1043,6 +1043,7 @@ int mlx5e_safe_reopen_channels(struct mlx5e_priv *priv);
 int mlx5e_safe_switch_channels(struct mlx5e_priv *priv,
                               struct mlx5e_channels *new_chs,
                               mlx5e_fp_preactivate preactivate);
+int mlx5e_num_channels_changed(struct mlx5e_priv *priv);
 void mlx5e_activate_priv_channels(struct mlx5e_priv *priv);
 void mlx5e_deactivate_priv_channels(struct mlx5e_priv *priv);
 

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index c6776f308d5e60e7fe792ab464c4cfb14e81656f..304ddce6b08728e9c315463afa08750e234a8db1 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -445,9 +445,7 @@ int mlx5e_ethtool_set_channels(struct mlx5e_priv *priv,
 
        if (!test_bit(MLX5E_STATE_OPENED, &priv->state)) {
                *cur_params = new_channels.params;
-               if (!netif_is_rxfh_configured(priv->netdev))
-                       mlx5e_build_default_indir_rqt(priv->rss_params.indirection_rqt,
-                                                     MLX5E_INDIR_RQT_SIZE, count);
+               mlx5e_num_channels_changed(priv);
                goto out;
        }
 
@@ -455,12 +453,8 @@ int mlx5e_ethtool_set_channels(struct mlx5e_priv *priv,
        if (arfs_enabled)
                mlx5e_arfs_disable(priv);
 
-       if (!netif_is_rxfh_configured(priv->netdev))
-               mlx5e_build_default_indir_rqt(priv->rss_params.indirection_rqt,
-                                             MLX5E_INDIR_RQT_SIZE, count);
-
        /* Switch to new channels, set new parameters and close old ones */
-       err = mlx5e_safe_switch_channels(priv, &new_channels, NULL);
+       err = mlx5e_safe_switch_channels(priv, &new_channels, mlx5e_num_channels_changed);
 
        if (arfs_enabled) {
                int err2 = mlx5e_arfs_enable(priv);

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 25690d52d48edf3978e73b078eed8aa95de25d9f..e56088db30dfba2a43e3c65f104407aa329beafe 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -2906,6 +2906,17 @@ static void mlx5e_update_netdev_queues(struct mlx5e_priv *priv)
        netif_set_real_num_rx_queues(netdev, num_rxqs);
 }
 
+int mlx5e_num_channels_changed(struct mlx5e_priv *priv)
+{
+       u16 count = priv->channels.params.num_channels;
+
+       if (!netif_is_rxfh_configured(priv->netdev))
+               mlx5e_build_default_indir_rqt(priv->rss_params.indirection_rqt,
+                                             MLX5E_INDIR_RQT_SIZE, count);
+
+       return 0;
+}
+
 static void mlx5e_build_txq_maps(struct mlx5e_priv *priv)
 {
        int i, ch;
@@ -5308,9 +5319,10 @@ int mlx5e_attach_netdev(struct mlx5e_priv *priv)
        max_nch = mlx5e_get_max_num_channels(priv->mdev);
        if (priv->channels.params.num_channels > max_nch) {
                mlx5_core_warn(priv->mdev, "MLX5E: Reducing number of channels to %d\n", max_nch);
+               /* Reducing the number of channels - RXFH has to be reset. */
+               priv->netdev->priv_flags &= ~IFF_RXFH_CONFIGURED;
                priv->channels.params.num_channels = max_nch;
-               mlx5e_build_default_indir_rqt(priv->rss_params.indirection_rqt,
-                                             MLX5E_INDIR_RQT_SIZE, max_nch);
+               mlx5e_num_channels_changed(priv);
        }
 
        err = profile->init_tx(priv);