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SubjectRe: [PATCH] virtio_net: Introduce extended RSC feature
On Tue, Jan 29, 2019 at 02:52:36PM +0200, Yuri Benditovich wrote:
> VIRTIO_NET_F_RSC_EXT feature bit indicates that the device
> is able to provide extended RSC information. When the feature
> is active and 'gso_type' field in received packet is not GSO_NONE,
> the device reports number of coalesced packets in 'csum_start'
> field and number of duplicated acks in 'csum_offset' field
> and sets VIRTIO_NET_HDR_F_RSC_INFO in 'flags' field.
>
> Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
> ---
> include/uapi/linux/virtio_net.h | 15 ++++++++++++++-
> 1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
> index a3715a3224c1..93c71d714475 100644
> --- a/include/uapi/linux/virtio_net.h
> +++ b/include/uapi/linux/virtio_net.h
> @@ -56,7 +56,7 @@
> #define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow
> * Steering */
> #define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */
> -
> +#define VIRTIO_NET_F_RSC_EXT 61 /* Provides extended RSC info */
> #define VIRTIO_NET_F_STANDBY 62 /* Act as standby for another device
> * with the same MAC.
> */
> @@ -104,6 +104,7 @@ struct virtio_net_config {
> struct virtio_net_hdr_v1 {
> #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start, csum_offset */
> #define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */
> +#define VIRTIO_NET_HDR_F_RSC_INFO 4 /* rsc_ext data in csum_ fields */
> __u8 flags;
> #define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */
> #define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */
> @@ -140,6 +141,18 @@ struct virtio_net_hdr_mrg_rxbuf {
> struct virtio_net_hdr hdr;
> __virtio16 num_buffers; /* Number of merged rx buffers */
> };
> +
> +static inline __virtio16 *virtio_net_rsc_ext_num_packets(
> + struct virtio_net_hdr *hdr)
> +{
> + return &hdr->csum_start;
> +}
> +
> +static inline __virtio16 *virtio_net_rsc_ext_num_dupacks(
> + struct virtio_net_hdr *hdr)
> +{
> + return &hdr->csum_offset;
> +}
> #endif /* ...VIRTIO_NET_NO_LEGACY */

Coding style is off here. But really I don't think these inlines are
needed here. Put them in qemu or something.

> /*
> --
> 2.17.1

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