net/mlx5: Use effective interrupt affinity

Using the interrupt affinity mask for checking locality is not really
working well on architectures which support effective affinity masks.

The affinity mask is either the system wide default or set by user space,
but the architecture can or even must reduce the mask to the effective set,
which means that checking the affinity mask itself does not really tell
about the actual target CPUs.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20201210194044.876342330@linutronix.de

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 4345bc41b2be55b16ac34809424cbe2ae5936f6d..9bcf73f417d0a0bef87c40d0fe48967fdf194050 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -1998,7 +1998,7 @@ static int mlx5e_open_channel(struct mlx5e_priv *priv, int ix,
        c->num_tc   = params->num_tc;
        c->xdp      = !!params->xdp_prog;
        c->stats    = &priv->channel_stats[ix].ch;
-       c->aff_mask = irq_get_affinity_mask(irq);
+       c->aff_mask = irq_get_effective_affinity_mask(irq);
        c->lag_port = mlx5e_enumerate_lag_port(priv->mdev, ix);
 
        netif_napi_add(netdev, &c->napi, mlx5e_napi_poll, 64);