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Subject[PATCH v2] 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 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 | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
index a3715a3224c1..2bdd26f8a4ed 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) */
@@ -118,6 +119,13 @@ struct virtio_net_hdr_v1 {
__virtio16 num_buffers; /* Number of merged rx buffers */
};

+/*
+ * if VIRTIO_NET_F_RSC_EXT feature has been negotiated and
+ * VIRTIO_NET_HDR_F_RSC_INFO is set in RX packet
+ */
+#define virtio_net_rsc_ext_num_packets csum_start
+#define virtio_net_rsc_ext_num_dupacks csum_offset
+
#ifndef VIRTIO_NET_NO_LEGACY
/* This header comes first in the scatter-gather list.
* For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must
--
2.17.1
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