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net/mlx5: Fix mlx5_get_vector_affinity function

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[ Upstream commit 6082d9c9c94a408d7409b5f2e4e42ac9e8b16d0d ]

Adding the vector offset when calling to mlx5_vector2eqn() is wrong.
This is because mlx5_vector2eqn() checks if EQ index is equal to vector number
and the fact that the internal completion vectors that mlx5 allocates
don't get an EQ index.

The second problem here is that using effective_affinity_mask gives the same
CPU for different vectors.
This leads to unmapped queues when calling it from blk_mq_rdma_map_queues().
This doesn't happen when using affinity_hint mask.

Fixes: 2572cf57d75a ("mlx5: fix mlx5_get_vector_affinity to start from completion vector 0")
Fixes: 05e0cc84e00c ("net/mlx5: Fix get vector affinity helper function")
Signed-off-by: Israel Rukshin <israelr@mellanox.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Israel Rukshin 2018-04-12 09:49:11 +00:00 committed by Greg Kroah-Hartman
parent 049fee28bb
commit 71a9d1240a
2 changed files with 4 additions and 10 deletions
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2
drivers/infiniband/hw/mlx5/main.c
View File

@ -3911,7 +3911,7 @@ mlx5_ib_get_vector_affinity(struct ib_device *ibdev, int comp_vector)
{
struct mlx5_ib_dev *dev = to_mdev(ibdev);
return mlx5_get_vector_affinity(dev->mdev, comp_vector);
return mlx5_get_vector_affinity_hint(dev->mdev, comp_vector);
}
static void *mlx5_ib_add(struct mlx5_core_dev *mdev)

12
include/linux/mlx5/driver.h
View File

@ -1193,25 +1193,19 @@ enum {
};
static inline const struct cpumask *
mlx5_get_vector_affinity(struct mlx5_core_dev *dev, int vector)
mlx5_get_vector_affinity_hint(struct mlx5_core_dev *dev, int vector)
{
const struct cpumask *mask;
struct irq_desc *desc;
unsigned int irq;
int eqn;
int err;
err = mlx5_vector2eqn(dev, MLX5_EQ_VEC_COMP_BASE + vector, &eqn, &irq);
err = mlx5_vector2eqn(dev, vector, &eqn, &irq);
if (err)
return NULL;
desc = irq_to_desc(irq);
#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
mask = irq_data_get_effective_affinity_mask(&desc->irq_data);
#else
mask = desc->irq_common_data.affinity;
#endif
return mask;
return desc->affinity_hint;
}
#endif /* MLX5_DRIVER_H */