virtio_net: introduce device stats feature and structures

The virtio-net device stats spec:

https://github.com/oasis-tcs/virtio-spec/commit/42f389989823039724f95bbbd243291ab0064f82

We introduce the relative feature and structures.
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

include/uapi/linux/virtio_net.h

@@ -56,6 +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_DEVICE_STATS 50	/* Device can provide device-level statistics. */
 #define VIRTIO_NET_F_VQ_NOTF_COAL 52	/* Device supports virtqueue notification coalescing */
 #define VIRTIO_NET_F_NOTF_COAL	53	/* Device supports notifications coalescing */
 #define VIRTIO_NET_F_GUEST_USO4	54	/* Guest can handle USOv4 in. */
@@ -406,4 +407,146 @@ struct  virtio_net_ctrl_coal_vq {
 	struct virtio_net_ctrl_coal coal;
 };
 
+/*
+ * Device Statistics
+ */
+#define VIRTIO_NET_CTRL_STATS         8
+#define VIRTIO_NET_CTRL_STATS_QUERY   0
+#define VIRTIO_NET_CTRL_STATS_GET     1
+
+struct virtio_net_stats_capabilities {
+
+#define VIRTIO_NET_STATS_TYPE_CVQ       (1ULL << 32)
+
+#define VIRTIO_NET_STATS_TYPE_RX_BASIC  (1ULL << 0)
+#define VIRTIO_NET_STATS_TYPE_RX_CSUM   (1ULL << 1)
+#define VIRTIO_NET_STATS_TYPE_RX_GSO    (1ULL << 2)
+#define VIRTIO_NET_STATS_TYPE_RX_SPEED  (1ULL << 3)
+
+#define VIRTIO_NET_STATS_TYPE_TX_BASIC  (1ULL << 16)
+#define VIRTIO_NET_STATS_TYPE_TX_CSUM   (1ULL << 17)
+#define VIRTIO_NET_STATS_TYPE_TX_GSO    (1ULL << 18)
+#define VIRTIO_NET_STATS_TYPE_TX_SPEED  (1ULL << 19)
+
+	__le64 supported_stats_types[1];
+};
+
+struct virtio_net_ctrl_queue_stats {
+	struct {
+		__le16 vq_index;
+		__le16 reserved[3];
+		__le64 types_bitmap[1];
+	} stats[1];
+};
+
+struct virtio_net_stats_reply_hdr {
+#define VIRTIO_NET_STATS_TYPE_REPLY_CVQ       32
+
+#define VIRTIO_NET_STATS_TYPE_REPLY_RX_BASIC  0
+#define VIRTIO_NET_STATS_TYPE_REPLY_RX_CSUM   1
+#define VIRTIO_NET_STATS_TYPE_REPLY_RX_GSO    2
+#define VIRTIO_NET_STATS_TYPE_REPLY_RX_SPEED  3
+
+#define VIRTIO_NET_STATS_TYPE_REPLY_TX_BASIC  16
+#define VIRTIO_NET_STATS_TYPE_REPLY_TX_CSUM   17
+#define VIRTIO_NET_STATS_TYPE_REPLY_TX_GSO    18
+#define VIRTIO_NET_STATS_TYPE_REPLY_TX_SPEED  19
+	__u8 type;
+	__u8 reserved;
+	__le16 vq_index;
+	__le16 reserved1;
+	__le16 size;
+};
+
+struct virtio_net_stats_cvq {
+	struct virtio_net_stats_reply_hdr hdr;
+
+	__le64 command_num;
+	__le64 ok_num;
+};
+
+struct virtio_net_stats_rx_basic {
+	struct virtio_net_stats_reply_hdr hdr;
+
+	__le64 rx_notifications;
+
+	__le64 rx_packets;
+	__le64 rx_bytes;
+
+	__le64 rx_interrupts;
+
+	__le64 rx_drops;
+	__le64 rx_drop_overruns;
+};
+
+struct virtio_net_stats_tx_basic {
+	struct virtio_net_stats_reply_hdr hdr;
+
+	__le64 tx_notifications;
+
+	__le64 tx_packets;
+	__le64 tx_bytes;
+
+	__le64 tx_interrupts;
+
+	__le64 tx_drops;
+	__le64 tx_drop_malformed;
+};
+
+struct virtio_net_stats_rx_csum {
+	struct virtio_net_stats_reply_hdr hdr;
+
+	__le64 rx_csum_valid;
+	__le64 rx_needs_csum;
+	__le64 rx_csum_none;
+	__le64 rx_csum_bad;
+};
+
+struct virtio_net_stats_tx_csum {
+	struct virtio_net_stats_reply_hdr hdr;
+
+	__le64 tx_csum_none;
+	__le64 tx_needs_csum;
+};
+
+struct virtio_net_stats_rx_gso {
+	struct virtio_net_stats_reply_hdr hdr;
+
+	__le64 rx_gso_packets;
+	__le64 rx_gso_bytes;
+	__le64 rx_gso_packets_coalesced;
+	__le64 rx_gso_bytes_coalesced;
+};
+
+struct virtio_net_stats_tx_gso {
+	struct virtio_net_stats_reply_hdr hdr;
+
+	__le64 tx_gso_packets;
+	__le64 tx_gso_bytes;
+	__le64 tx_gso_segments;
+	__le64 tx_gso_segments_bytes;
+	__le64 tx_gso_packets_noseg;
+	__le64 tx_gso_bytes_noseg;
+};
+
+struct virtio_net_stats_rx_speed {
+	struct virtio_net_stats_reply_hdr hdr;
+
+	/* rx_{packets,bytes}_allowance_exceeded are too long. So rename to
+	 * short name.
+	 */
+	__le64 rx_ratelimit_packets;
+	__le64 rx_ratelimit_bytes;
+};
+
+struct virtio_net_stats_tx_speed {
+	struct virtio_net_stats_reply_hdr hdr;
+
+	/* tx_{packets,bytes}_allowance_exceeded are too long. So rename to
+	 * short name.
+	 */
+	__le64 tx_ratelimit_packets;
+	__le64 tx_ratelimit_bytes;
+};
+
 #endif /* _UAPI_LINUX_VIRTIO_NET_H */