Commit fb0a6a26 authored by Eli Cohen's avatar Eli Cohen Committed by Saeed Mahameed
Browse files

net/mlx5: Provide external API for allocating vectors 



Provide external API to be used by other drivers relying on mlx5_core,
for allocating MSIX vectors. An example for such a driver would be
mlx5_vdpa.

Signed-off-by: default avatarEli Cohen <elic@nvidia.com>
Reviewed-by: default avatarShay Drory <shayd@nvidia.com>
Signed-off-by: default avatarSaeed Mahameed <saeedm@nvidia.com>
Reviewed-by: default avatarJacob Keller <jacob.e.keller@intel.com>
parent b637ac5d

drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c

+52 −0
Original line number Diff line number Diff line
@@ -483,6 +483,58 @@ struct mlx5_irq *mlx5_irq_request(struct mlx5_core_dev *dev, u16 vecidx, 
	return irq;

}



/**

 * mlx5_msix_alloc - allocate msix interrupt

 * @dev: mlx5 device from which to request

 * @handler: interrupt handler

 * @affdesc: affinity descriptor

 * @name: interrupt name

 *

 * Returns: struct msi_map with result encoded.

 * Note: the caller must make sure to release the irq by calling

 *       mlx5_msix_free() if shutdown was initiated.

 */

struct msi_map mlx5_msix_alloc(struct mlx5_core_dev *dev,

			       irqreturn_t (*handler)(int, void *),

			       const struct irq_affinity_desc *affdesc,

			       const char *name)

{

	struct msi_map map;

	int err;



	if (!dev->pdev) {

		map.virq = 0;

		map.index = -EINVAL;

		return map;

	}



	map = pci_msix_alloc_irq_at(dev->pdev, MSI_ANY_INDEX, affdesc);

	if (!map.virq)

		return map;



	err = request_irq(map.virq, handler, 0, name, NULL);

	if (err) {

		mlx5_core_warn(dev, "err %d\n", err);

		pci_msix_free_irq(dev->pdev, map);

		map.virq = 0;

		map.index = -ENOMEM;

	}

	return map;

}

EXPORT_SYMBOL(mlx5_msix_alloc);



/**

 * mlx5_msix_free - free a previously allocated msix interrupt

 * @dev: mlx5 device associated with interrupt

 * @map: map previously returned by mlx5_msix_alloc()

 */

void mlx5_msix_free(struct mlx5_core_dev *dev, struct msi_map map)

{

	free_irq(map.virq, NULL);

	pci_msix_free_irq(dev->pdev, map);

}

EXPORT_SYMBOL(mlx5_msix_free);



/**

 * mlx5_irqs_release_vectors - release one or more IRQs back to the system.

 * @irqs: IRQs to be released.

include/linux/mlx5/driver.h

+6 −0
Original line number Diff line number Diff line
@@ -1308,4 +1308,10 @@ enum { 
	MLX5_OCTWORD = 16,

};



struct msi_map mlx5_msix_alloc(struct mlx5_core_dev *dev,

			       irqreturn_t (*handler)(int, void *),

			       const struct irq_affinity_desc *affdesc,

			       const char *name);

void mlx5_msix_free(struct mlx5_core_dev *dev, struct msi_map map);



#endif /* MLX5_DRIVER_H */