diff options
author | Eli Cohen <elic@nvidia.com> | 2023-01-05 11:31:46 +0200 |
---|---|---|
committer | Saeed Mahameed <saeedm@nvidia.com> | 2023-03-24 16:04:30 -0700 |
commit | fb0a6a268dcd6fe144c99d60a1166e34c6991d5f (patch) | |
tree | c104caa834cdf78bb434f1f015511dfb8b0dc03f /drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c | |
parent | b637ac5db0d0fd00cbe88469999ba2985355ac95 (diff) |
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: 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>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c')
-rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c b/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c index 7fa63d31ae5b..e12e528c09f5 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c @@ -484,6 +484,58 @@ struct mlx5_irq *mlx5_irq_request(struct mlx5_core_dev *dev, u16 vecidx, } /** + * 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. * @nirqs: number of IRQs to be released. |