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net/mlx5: Provide external API for allocating vectors

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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: Eli Cohen <elic@nvidia.com>
Reviewed-by: Shay Drory <shayd@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
This commit is contained in:
Eli Cohen 2023-01-05 11:31:46 +02:00 committed by Saeed Mahameed
parent b637ac5db0
commit fb0a6a268d
2 changed files with 58 additions and 0 deletions
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52
drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
View file

@ -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.

6
include/linux/mlx5/driver.h
View file

@ -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 */