[PATCH 1/3] virtio-net: introduce RSS RX steering feature

[Yuri Benditovich]

Signed-off-by: Yuri Benditovich <address@hidden>
---
 include/standard-headers/linux/virtio_net.h | 37 +++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

diff --git a/include/standard-headers/linux/virtio_net.h 
b/include/standard-headers/linux/virtio_net.h
index 260c3681d7..3bc100afe3 100644
--- a/include/standard-headers/linux/virtio_net.h
+++ b/include/standard-headers/linux/virtio_net.h
@@ -57,6 +57,7 @@
                                         * Steering */
 #define VIRTIO_NET_F_CTRL_MAC_ADDR 23  /* Set MAC address */
 
+#define VIRTIO_NET_F_RSS         60    /* Supports RSS RX steering */
 #define VIRTIO_NET_F_STANDBY     62    /* Act as standby for another device
                                         * with the same MAC.
                                         */
@@ -69,6 +70,16 @@
 #define VIRTIO_NET_S_LINK_UP   1       /* Link is up */
 #define VIRTIO_NET_S_ANNOUNCE  2       /* Announcement is needed */
 
+#define VIRTIO_NET_RSS_HASH_TYPE_IPv4              (1 << 0)
+#define VIRTIO_NET_RSS_HASH_TYPE_TCPv4             (1 << 1)
+#define VIRTIO_NET_RSS_HASH_TYPE_UDPv4             (1 << 2)
+#define VIRTIO_NET_RSS_HASH_TYPE_IPv6              (1 << 3)
+#define VIRTIO_NET_RSS_HASH_TYPE_TCPv6             (1 << 4)
+#define VIRTIO_NET_RSS_HASH_TYPE_UDPv6             (1 << 5)
+#define VIRTIO_NET_RSS_HASH_TYPE_IP_EX             (1 << 6)
+#define VIRTIO_NET_RSS_HASH_TYPE_TCP_EX            (1 << 7)
+#define VIRTIO_NET_RSS_HASH_TYPE_UDP_EX            (1 << 8)
+
 struct virtio_net_config {
        /* The config defining mac address (if VIRTIO_NET_F_MAC) */
        uint8_t mac[ETH_ALEN];
@@ -92,6 +103,14 @@ struct virtio_net_config {
         * Any other value stands for unknown.
         */
        uint8_t duplex;
+
+       /* maximal size of RSS key */
+       uint8_t rss_max_key_size;
+       /* maximal number of indirection table entries */
+       uint16_t rss_max_indirection_table_length;
+       /* bitmask of supported VIRTIO_NET_RSS_HASH_ types */
+       uint32_t supported_hash_types;
+
 } QEMU_PACKED;
 
 /*
@@ -237,15 +256,29 @@ struct virtio_net_ctrl_mac {
  * Accordingly, driver should not transmit new packets  on virtqueues other 
than
  * specified.
  */
+#define VIRTIO_NET_CTRL_MQ   4
+ #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET        0
+ #define VIRTIO_NET_CTRL_MQ_RSS_CONFIG          1
+
+/* for VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET */
 struct virtio_net_ctrl_mq {
        __virtio16 virtqueue_pairs;
 };
 
-#define VIRTIO_NET_CTRL_MQ   4
- #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET        0
  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN        1
  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX        0x8000
 
+/* for VIRTIO_NET_CTRL_MQ_RSS_CONFIG */
+struct virtio_net_rss_config {
+    uint32_t hash_types;
+    uint16_t indirection_table_mask;
+    uint16_t unclassified_queue;
+    uint16_t indirection_table[1/* + indirection_table_mask*/];
+    uint16_t max_tx_vq;
+    uint8_t hash_key_length;
+    uint8_t hash_key_data[/*hash_key_length*/];
+};
+
 /*
  * Control network offloads
  *
-- 
2.17.1