[Intel-wired-lan] [net-next PATCH v4 1/2] ethtool: Add helper routines to pass vf to rx_flow_spec

[John Fastabend]

On 05/18/2015 09:18 AM, John Fastabend wrote:
> The ring_cookie is 64 bits wide which is much larger than can be used
> for actual queue index values. So provide some helper routines to
> pack a VF index into the cookie. This is useful to steer packets to
> a VF ring without having to know the queue layout of the device.
>
> Signed-off-by: John Fastabend <john.r.fastabend at intel.com>
> ---
>   include/uapi/linux/ethtool.h |   25 +++++++++++++++++++++++++
>   1 file changed, 25 insertions(+)
>
> diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
> index 2e49fc8..b5b4287 100644
> --- a/include/uapi/linux/ethtool.h
> +++ b/include/uapi/linux/ethtool.h
> @@ -796,6 +796,31 @@ struct ethtool_rx_flow_spec {
>   	__u32		location;
>   };
>
> +/* How rings are layed out when accessing virtual functions or
> + * offloaded queues is device specific. To allow users to do flow
> + * steering and specify these queues the ring cookie is partitioned
> + * into a 32bit queue index with an 8 bit virtual function id.
> + * This also leaves the 3bytes for further specifiers. It is possible
> + * future devices may support more than 256 virtual functions if
> + * devices start supporting PCIe w/ARI. However at the moment I
> + * do not know of any devices that support this so I do not reserve
> + * space for this at this time. If a future patch consumes the next
> + * byte it should be aware of this possiblity.
> + */
> +#define ETHTOOL_RX_FLOW_SPEC_RING	0x00000000FFFFFFFF
> +#define ETHTOOL_RX_FLOW_SPEC_RING_VF	0x000000FF00000000

This needs an LL,

  +#define ETHTOOL_RX_FLOW_SPEC_RING	0x00000000FFFFFFFFLL
  +#define ETHTOOL_RX_FLOW_SPEC_RING_VF	0x000000FF00000000LL

so I guess I'll have to send a v5.

Thanks,
John


-- 
John Fastabend         Intel Corporation