[PATCH 1/3] virtio-net: Introduce extended RSC feature
From: Yuri Benditovich <hidden>
Date: 2020-02-29 17:13:15
Also in:
lkml
Subsystem:
the rest, virtio core, virtio net driver · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang, Eugenio Pérez
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 <redacted> --- include/uapi/linux/virtio_net.h | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
index a3715a3224c1..6e26a2cc6ad0 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 +115,14 @@ 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 { + __virtio16 csum_start; /* Position to start checksumming from */ + __virtio16 rsc_ext_num_packets; /* num of coalesced packets */ + }; + union { + __virtio16 csum_offset; /* Offset after that to place checksum */ + __virtio16 rsc_ext_num_dupacks; /* num of duplicated acks */ + }; __virtio16 num_buffers; /* Number of merged rx buffers */ };
--
2.17.1