| Message ID | 20201210194044.876342330@linutronix.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | genirq: Treewide hunt for irq descriptor abuse and assorted fixes | expand |
On 12/10/2020 9:25 PM, Thomas Gleixner wrote: > 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); > Reviewed-by: Tariq Toukan <tariqt@nvidia.com> Thanks.
On Thu, 2020-12-10 at 20:25 +0100, Thomas Gleixner wrote: > 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 > Acked-by: Saeed Mahameed <saeedm@nvidia.com>
--- 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);
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(-)