On 8/16/2019 7:12 AM, vattun...@marvell.com wrote:
> From: Kiran Kumar K <kirankum...@marvell.com>
>
> Patch adds support for kernel module to work in IOVA = VA mode,
> the idea is to get physical address from IOVA address using
> iommu_iova_to_phys API and later use phys_to_virt API to
> convert the physical address to kernel virtual address.
>
> When compared with IOVA = PA mode, there is no performance
> drop with this approach.
>
> This approach does not work with the kernel versions less
> than 4.4.0 because of API compatibility issues.
>
> Patch also updates these support details in KNI documentation.
>
> Signed-off-by: Kiran Kumar K <kirankum...@marvell.com>
> Signed-off-by: Vamsi Attunuru <vattun...@marvell.com>
<...>
> @@ -348,15 +351,65 @@ kni_ioctl_create(struct net *net, uint32_t ioctl_num,
> strncpy(kni->name, dev_info.name, RTE_KNI_NAMESIZE);
>
> /* Translate user space info into kernel space info */
> - kni->tx_q = phys_to_virt(dev_info.tx_phys);
> - kni->rx_q = phys_to_virt(dev_info.rx_phys);
> - kni->alloc_q = phys_to_virt(dev_info.alloc_phys);
> - kni->free_q = phys_to_virt(dev_info.free_phys);
> -
> - kni->req_q = phys_to_virt(dev_info.req_phys);
> - kni->resp_q = phys_to_virt(dev_info.resp_phys);
> - kni->sync_va = dev_info.sync_va;
> - kni->sync_kva = phys_to_virt(dev_info.sync_phys);
> + if (dev_info.iova_mode) {
> +#ifdef HAVE_IOVA_AS_VA_SUPPORT
> + pci = pci_get_device(dev_info.vendor_id,
> + dev_info.device_id, NULL);
> + if (pci == NULL) {
> + pr_err("pci dev does not exist\n");
> + return -ENODEV;
> + }
If there is no PCI device KNI should still work.
