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 Cc: Leon Romanovsky leon@kernel.org Cc: "David S. Miller" davem@davemloft.net Cc: Jakub Kicinski kuba@kernel.org Cc: netdev@vger.kernel.org Cc: linux-rdma@vger.kernel.org --- drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- 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 mlx 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);