Drivers: net: hyperv: Enable receive side IP checksum offload

Enable receive side checksum 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>

3 files changed, 50 insertions, 6 deletions

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 8bc4e766589b..faeb74623fbd 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -30,6 +30,7 @@
 
 /* Fwd declaration */
 struct hv_netvsc_packet;
+struct ndis_tcp_ip_checksum_info;
 
 /* Represent the xfer page packet which contains 1 or more netvsc packet */
 struct xferpage_packet {
@@ -117,7 +118,8 @@ int netvsc_send(struct hv_device *device,
 void netvsc_linkstatus_callback(struct hv_device *device_obj,
                                 unsigned int status);
 int netvsc_recv_callback(struct hv_device *device_obj,
-                        struct hv_netvsc_packet *packet);
+                        struct hv_netvsc_packet *packet,
+                        struct ndis_tcp_ip_checksum_info *csum_info);
 int rndis_filter_open(struct hv_device *dev);
 int rndis_filter_close(struct hv_device *dev);
 int rndis_filter_device_add(struct hv_device *dev,
@@ -776,9 +778,38 @@ struct ndis_offload_params {
         };
 };
 
+struct ndis_tcp_ip_checksum_info {
+        union {
+                struct {
+                        u32 is_ipv4:1;
+                        u32 is_ipv6:1;
+                        u32 tcp_checksum:1;
+                        u32 udp_checksum:1;
+                        u32 ip_header_checksum:1;
+                        u32 reserved:11;
+                        u32 tcp_header_offset:10;
+                } transmit;
+                struct {
+                        u32 tcp_checksum_failed:1;
+                        u32 udp_checksum_failed:1;
+                        u32 ip_checksum_failed:1;
+                        u32 tcp_checksum_succeeded:1;
+                        u32 udp_checksum_succeeded:1;
+                        u32 ip_checksum_succeeded:1;
+                        u32 loopback:1;
+                        u32 tcp_checksum_value_invalid:1;
+                        u32 ip_checksum_value_invalid:1;
+                } receive;
+                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))
+
 /* 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 7010c0630d24..9bee0650c7ca 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -391,7 +391,8 @@ void netvsc_linkstatus_callback(struct hv_device *device_obj,
  * "wire" on the specified device.
  */
 int netvsc_recv_callback(struct hv_device *device_obj,
-                                struct hv_netvsc_packet *packet)
+                                struct hv_netvsc_packet *packet,
+                                struct ndis_tcp_ip_checksum_info *csum_info)
 {
         struct net_device *net;
         struct sk_buff *skb;
@@ -418,7 +419,17 @@ int netvsc_recv_callback(struct hv_device *device_obj,
                 packet->total_data_buflen);
 
         skb->protocol = eth_type_trans(skb, net);
-        skb->ip_summed = CHECKSUM_NONE;
+        if (csum_info) {
+                /* We only look at the IP checksum here.
+                 * Should we be dropping the packet if checksum
+                 * failed? How do we deal with other checksums - TCP/UDP?
+                 */
+                if (csum_info->receive.ip_checksum_succeeded)
+                        skb->ip_summed = CHECKSUM_UNNECESSARY;
+                else
+                        skb->ip_summed = CHECKSUM_NONE;
+        }
+
         if (packet->vlan_tci & VLAN_TAG_PRESENT)
                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
                                        packet->vlan_tci);
@@ -578,8 +589,8 @@ static int netvsc_probe(struct hv_device *dev,
         net->netdev_ops = &device_ops;
 
         /* TODO: Add GSO and Checksum offload */
-        net->hw_features = NETIF_F_SG;
-        net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG;
+        net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG;
+        net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM;
 
         SET_ETHTOOL_OPS(net, &ethtool_ops);
         SET_NETDEV_DEV(net, &dev->device);
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 42bfb3a11efd..54553df74cd2 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -350,6 +350,7 @@ static void rndis_filter_receive_data(struct rndis_device *dev,
         struct rndis_packet *rndis_pkt;
         u32 data_offset;
         struct ndis_pkt_8021q_info *vlan;
+        struct ndis_tcp_ip_checksum_info *csum_info;
 
         rndis_pkt = &msg->msg.pkt;
 
@@ -388,7 +389,8 @@ static void rndis_filter_receive_data(struct rndis_device *dev,
                 pkt->vlan_tci = 0;
         }
 
-        netvsc_recv_callback(dev->net_dev->dev, pkt);
+        csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO);
+        netvsc_recv_callback(dev->net_dev->dev, pkt, csum_info);
 }
 
 int rndis_filter_receive(struct hv_device *dev,