Re: [dpdk-dev] [PATCH] eal_pci: Fix max_vfs missing for none igb_uio driver

[David Marchand <david.marchand@6wind.com>]

Hello Michael,

On Wed, Feb 11, 2015 at 12:10 PM, Michael Qiu <michael.qiu@intel.com> wrote:

> max_vfs will only be created by igb_uio driver, for other
> drivers like vfio or pci_uio_generic, max_vfs will miss.
>
> But sriov_numvfs is not driver related, just get the vf numbers
> from that field.
>
> Signed-off-by: Michael Qiu <michael.qiu@intel.com>
> ---
>  lib/librte_eal/linuxapp/eal/eal_pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c
> b/lib/librte_eal/linuxapp/eal/eal_pci.c
> index 1f43688..3da4b69 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_pci.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
> @@ -305,7 +305,7 @@ pci_scan_one(const char *dirname, uint16_t domain,
> uint8_t bus,
>
>         /* get max_vfs */
>         dev->max_vfs = 0;
> -       snprintf(filename, sizeof(filename), "%s/max_vfs", dirname);
> +       snprintf(filename, sizeof(filename), "%s/sriov_numvfs", dirname);
>         if (!access(filename, F_OK) &&
>             eal_parse_sysfs_value(filename, &tmp) == 0) {
>                 dev->max_vfs = (uint16_t)tmp;
>
>
Not too sure about this change.
Quickly looked, and as far as I can see, sriov_numvfs has been introduced
by 1789382a ("PCI: SRIOV control and status via sysfs").

Won't your change break anything that uses a kernel < 3.8 (not backported) ?


-- 
David Marchand