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SubjectRe: [PATCH v3 1/3] virtio-net: Introduce extended RSC feature
On Sun, Mar 01, 2020 at 04:33:00PM +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 negotiatede 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 | 22 ++++++++++++++++++++--
> 1 file changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
> index a3715a3224c1..19e76b3e3a64 100644
> --- a/include/uapi/linux/virtio_net.h
> +++ b/include/uapi/linux/virtio_net.h
> @@ -57,6 +57,7 @@
> * Steering */
> #define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */
>
> +#define VIRTIO_NET_F_RSC_EXT 61 /* extended coalescing info */
> #define VIRTIO_NET_F_STANDBY 62 /* Act as standby for another device
> * with the same MAC.
> */
> @@ -104,6 +105,7 @@ 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 info 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) */
> @@ -113,8 +115,24 @@ struct virtio_net_hdr_v1 {
> __u8 gso_type;
> __virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
> __virtio16 gso_size; /* Bytes to append to hdr_len per frame */
> - __virtio16 csum_start; /* Position to start checksumming from */
> - __virtio16 csum_offset; /* Offset after that to place checksum */
> + union {
> + struct {
> + __virtio16 csum_start;
> + __virtio16 csum_offset;
> + };


Pls add comments for this one as well.

> + struct {
> + /* Position to start checksumming from */
> + __virtio16 start;
> + /* Offset after that to place checksum */
> + __virtio16 offset;
> + } csum;

Can we add a comment for csum field pls? E.g.
/* Checksum calculation */

> + struct {
> + /* num of coalesced packets */


num -> Number? Don't abbreviate and upper case for consistency.

> + __le16 packets;

packets -> coalesced_packets? Or is coalesced segments in fact better?

> + /* num of duplicated acks */

num -> Number? Don't abbreviate and upper case for consistency.


> + __le16 dup_acks;
> + } rsc;

/* Receive Segment Coalescing report */

> + };
> __virtio16 num_buffers; /* Number of merged rx buffers */
> };
>
> --
> 2.17.1

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