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Subject[PATCH] virtio_net: Introduce extended RSC feature
Date
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 */

/*
--
2.17.1
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