Drivers: net: hyperv: Enable large send offload

Enable segmentation offload.

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

2 files changed, 74 insertions, 4 deletions

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 4cf238234321..7d06b4959383 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -742,6 +742,10 @@ struct ndis_oject_header {
 #define NDIS_OFFLOAD_PARAMETERS_RX_ENABLED_TX_DISABLED 3
 #define NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED 4
 
+#define NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE     1
+#define NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4        0
+#define NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6        1
+
 /*
  * New offload OIDs for NDIS 6
  */
@@ -804,12 +808,48 @@ struct ndis_tcp_ip_checksum_info {
         };
 };
 
+struct ndis_tcp_lso_info {
+        union {
+                struct {
+                        u32 unused:30;
+                        u32 type:1;
+                        u32 reserved2:1;
+                } transmit;
+                struct {
+                        u32 mss:20;
+                        u32 tcp_header_offset:10;
+                        u32 type:1;
+                        u32 reserved2:1;
+                } lso_v1_transmit;
+                struct {
+                        u32 tcp_payload:30;
+                        u32 type:1;
+                        u32 reserved2:1;
+                } lso_v1_transmit_complete;
+                struct {
+                        u32 mss:20;
+                        u32 tcp_header_offset:10;
+                        u32 type:1;
+                        u32 ip_version:1;
+                } lso_v2_transmit;
+                struct {
+                        u32 reserved:30;
+                        u32 type:1;
+                        u32 reserved2:1;
+                } lso_v2_transmit_complete;
+                u32  value;
+        };
+};
+
 #define NDIS_VLAN_PPI_SIZE (sizeof(struct rndis_per_packet_info) + \
                 sizeof(struct ndis_pkt_8021q_info))
 
 #define NDIS_CSUM_PPI_SIZE (sizeof(struct rndis_per_packet_info) + \
                 sizeof(struct ndis_tcp_ip_checksum_info))
 
+#define NDIS_LSO_PPI_SIZE (sizeof(struct rndis_per_packet_info) + \
+                sizeof(struct ndis_tcp_lso_info))
+
 /* Format of Information buffer passed in a SetRequest for the OID */
 /* OID_GEN_RNDIS_CONFIG_PARAMETER. */
 struct rndis_config_parameter_info {
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 697837537ccb..3d069901e6d9 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -298,6 +298,7 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
         bool isvlan;
         struct rndis_per_packet_info *ppi;
         struct ndis_tcp_ip_checksum_info *csum_info;
+        struct ndis_tcp_lso_info *lso_info;
         int  hdr_offset;
         u32 net_trans_info;
 
@@ -377,7 +378,7 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
          * GSO packet.
          */
         if (skb_is_gso(skb))
-                goto do_send;
+                goto do_lso;
 
         rndis_msg_size += NDIS_CSUM_PPI_SIZE;
         ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
@@ -397,6 +398,35 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
         } else if (net_trans_info & INFO_UDP) {
                 csum_info->transmit.udp_checksum = 1;
         }
+        goto do_send;
+
+do_lso:
+        rndis_msg_size += NDIS_LSO_PPI_SIZE;
+        ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
+                            TCP_LARGESEND_PKTINFO);
+
+        lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
+                        ppi->ppi_offset);
+
+        lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
+        if (net_trans_info & (INFO_IPV4 << 16)) {
+                lso_info->lso_v2_transmit.ip_version =
+                        NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
+                ip_hdr(skb)->tot_len = 0;
+                ip_hdr(skb)->check = 0;
+                tcp_hdr(skb)->check =
+                ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
+                                   ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
+        } else {
+                lso_info->lso_v2_transmit.ip_version =
+                        NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
+                ipv6_hdr(skb)->payload_len = 0;
+                tcp_hdr(skb)->check =
+                ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+                                &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
+        }
+        lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset;
+        lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
 
 do_send:
         /* Start filling in the page buffers with the rndis hdr */
@@ -652,10 +682,10 @@ static int netvsc_probe(struct hv_device *dev,
 
         net->netdev_ops = &device_ops;
 
-        /* TODO: Add GSO and Checksum offload */
-        net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM;
+        net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM |
+                                NETIF_F_TSO;
         net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM |
-                        NETIF_F_IP_CSUM;
+                        NETIF_F_IP_CSUM | NETIF_F_TSO;
 
         SET_ETHTOOL_OPS(net, &ethtool_ops);
         SET_NETDEV_DEV(net, &dev->device);