[dpdk-dev] [PATCH] igb_uio: switch to pci_alloc_irq_vectors()

Ferruh Yigit ferruh.yigit at intel.com
Wed Apr 19 20:33:52 CEST 2017


On 4/13/2017 3:56 PM, Nicolas Dichtel wrote:
> pci_enable_msix() will be removed in kernel 4.12. The new API is available since
> linux 4.8, thus let's use it.
> 
> Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=aff171641d18
> Link: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=4244de1c64de
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel at 6wind.com>
> Reviewed-by: David Marchand <david.marchand at 6wind.com>
> ---
>  lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
> index 192bd4a96b68..b50e0f8b0457 100644
> --- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
> +++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
> @@ -325,7 +325,9 @@ static int
>  igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
>  {
>  	struct rte_uio_pci_dev *udev;
> +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)
>  	struct msix_entry msix_entry;
> +#endif
>  	dma_addr_t map_dma_addr;
>  	void *map_addr;
>  	int err;
> @@ -381,6 +383,7 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
>  	switch (igbuio_intr_mode_preferred) {
>  	case RTE_INTR_MODE_MSIX:
>  		/* Only 1 msi-x vector needed */
> +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)

Hi Nicolas,

Overall patch looks good, thanks.

Only can you please use compat.h for version check, instead of doing in
c file?

Thanks,
ferruh

>  		msix_entry.entry = 0;
>  		if (pci_enable_msix(dev, &msix_entry, 1) == 0) {
>  			dev_dbg(&dev->dev, "using MSI-X");
> @@ -389,6 +392,14 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
>  			udev->mode = RTE_INTR_MODE_MSIX;
>  			break;
>  		}
> +#else
> +		if (pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_MSIX) == 1) {
> +			dev_dbg(&dev->dev, "using MSI-X");
> +			udev->info.irq = pci_irq_vector(dev, 0);
> +			udev->mode = RTE_INTR_MODE_MSIX;
> +			break;
> +		}
> +#endif
>  		/* fall back to INTX */
>  	case RTE_INTR_MODE_LEGACY:
>  		if (pci_intx_mask_supported(dev)) {
> 



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