hv_netvsc: Add support for LRO/RSC in the vSwitch

LRO/RSC in the vSwitch is a feature available in Windows Server 2019
hosts and later. It reduces the per packet processing overhead by
coalescing multiple TCP segments when possible. This patch adds netvsc
driver support for this feature.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 7 deletions

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index a32ded5b4f41..7f1603dc8128 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -186,6 +186,7 @@ struct rndis_device {
 /* Interface */
 struct rndis_message;
 struct netvsc_device;
+struct netvsc_channel;
 struct net_device_context;
 
 extern u32 netvsc_ring_bytes;
@@ -203,10 +204,7 @@ void netvsc_linkstatus_callback(struct net_device *net,
 				struct rndis_message *resp);
 int netvsc_recv_callback(struct net_device *net,
 			 struct netvsc_device *nvdev,
-			 struct vmbus_channel *channel,
-			 void  *data, u32 len,
-			 const struct ndis_tcp_ip_checksum_info *csum_info,
-			 const struct ndis_pkt_8021q_info *vlan);
+			 struct netvsc_channel *nvchan);
 void netvsc_channel_cb(void *context);
 int netvsc_poll(struct napi_struct *napi, int budget);
 
@@ -222,7 +220,7 @@ int rndis_filter_set_rss_param(struct rndis_device *rdev,
 			       const u8 *key);
 int rndis_filter_receive(struct net_device *ndev,
 			 struct netvsc_device *net_dev,
-			 struct vmbus_channel *channel,
+			 struct netvsc_channel *nvchan,
 			 void *data, u32 buflen);
 
 int rndis_filter_set_device_mac(struct netvsc_device *ndev,
@@ -524,6 +522,8 @@ struct nvsp_2_vsc_capability {
 			u64 ieee8021q:1;
 			u64 correlation_id:1;
 			u64 teaming:1;
+			u64 vsubnetid:1;
+			u64 rsc:1;
 		};
 	};
 } __packed;
@@ -826,7 +826,7 @@ struct nvsp_message {
 
 #define NETVSC_SUPPORTED_HW_FEATURES (NETIF_F_RXCSUM | NETIF_F_IP_CSUM | \
 				      NETIF_F_TSO | NETIF_F_IPV6_CSUM | \
-				      NETIF_F_TSO6)
+				      NETIF_F_TSO6 | NETIF_F_LRO)
 
 #define VRSS_SEND_TAB_SIZE 16  /* must be power of 2 */
 #define VRSS_CHANNEL_MAX 64
@@ -852,6 +852,18 @@ struct multi_recv_comp {
 	u32 next;	/* next entry for writing */
 };
 
+#define NVSP_RSC_MAX 562 /* Max #RSC frags in a vmbus xfer page pkt */
+
+struct nvsc_rsc {
+	const struct ndis_pkt_8021q_info *vlan;
+	const struct ndis_tcp_ip_checksum_info *csum_info;
+	u8 is_last; /* last RNDIS msg in a vmtransfer_page */
+	u32 cnt; /* #fragments in an RSC packet */
+	u32 pktlen; /* Full packet length */
+	void *data[NVSP_RSC_MAX];
+	u32 len[NVSP_RSC_MAX];
+};
+
 struct netvsc_stats {
 	u64 packets;
 	u64 bytes;
@@ -955,6 +967,7 @@ struct netvsc_channel {
 	struct multi_send_data msd;
 	struct multi_recv_comp mrc;
 	atomic_t queue_sends;
+	struct nvsc_rsc rsc;
 
 	struct netvsc_stats tx_stats;
 	struct netvsc_stats rx_stats;
@@ -1136,7 +1149,8 @@ struct rndis_oobd {
 /* Packet extension field contents associated with a Data message. */
 struct rndis_per_packet_info {
 	u32 size;
-	u32 type;
+	u32 type:31;
+	u32 internal:1;
 	u32 ppi_offset;
 };
 
@@ -1157,6 +1171,25 @@ enum ndis_per_pkt_info_type {
 	MAX_PER_PKT_INFO
 };
 
+enum rndis_per_pkt_info_interal_type {
+	RNDIS_PKTINFO_ID = 1,
+	/* Add more memebers here */
+
+	RNDIS_PKTINFO_MAX
+};
+
+#define RNDIS_PKTINFO_SUBALLOC BIT(0)
+#define RNDIS_PKTINFO_1ST_FRAG BIT(1)
+#define RNDIS_PKTINFO_LAST_FRAG BIT(2)
+
+#define RNDIS_PKTINFO_ID_V1 1
+
+struct rndis_pktinfo_id {
+	u8 ver;
+	u8 flag;
+	u16 pkt_id;
+};
+
 struct ndis_pkt_8021q_info {
 	union {
 		struct {