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virtio-net: Introduce extended RSC feature

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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>
Link: https://lore.kernel.org/r/20200302115003.14877-2-yuri.benditovich@daynix.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Yuri Benditovich 2020-03-02 13:50:01 +02:00 committed by Michael S. Tsirkin
parent d5f5ee2a49
commit 22b436c9b5
1 changed files with 22 additions and 2 deletions
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24
include/uapi/linux/virtio_net.h
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@ -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 +115,26 @@ 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;
};
/* Checksum calculation */
struct {
/* Position to start checksumming from */
__virtio16 start;
/* Offset after that to place checksum */
__virtio16 offset;
} csum;
/* Receive Segment Coalescing */
struct {
/* Number of coalesced segments */
__le16 segments;
/* Number of duplicated acks */
__le16 dup_acks;
} rsc;
};
__virtio16 num_buffers; /* Number of merged rx buffers */
};