[PATCH 5/6] Drivers: net: hyperv: Enable send side checksum offload

[K. Y. Srinivasan]

Enable send side checksum offload.

Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
Reviewed-by: Haiyang Zhang <haiya...@microsoft.com>
---
 drivers/net/hyperv/netvsc_drv.c |   70 +++++++++++++++++++++++++++++++++++++-
 1 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 98562fc..e8159a8 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -259,6 +259,36 @@ static int netvsc_get_slots(struct sk_buff *skb)
        return slots + frag_slots;
 }
 
+bool get_net_transport_info(struct sk_buff *skb, bool *is_v4,
+                               bool *is_tcp, bool *is_udp, u32 *trans_off)
+{
+       *is_tcp = false;
+       *is_udp = false;
+
+       if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
+               (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
+               return false;
+       }
+
+       *trans_off = skb_transport_offset(skb);
+
+       if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
+               struct iphdr *iphdr = ip_hdr(skb);
+               *is_v4 = true;
+               if (iphdr->protocol == IPPROTO_TCP)
+                       *is_tcp = true;
+               else if (iphdr->protocol == IPPROTO_UDP)
+                       *is_udp = true;
+       } else {
+               *is_v4 = false;
+               if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
+                       *is_tcp = true;
+               else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
+                       *is_udp = true;
+       }
+       return true;
+}
+
 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 {
        struct net_device_context *net_device_ctx = netdev_priv(net);
@@ -270,6 +300,12 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct 
net_device *net)
        u32 rndis_msg_size;
        bool isvlan;
        struct rndis_per_packet_info *ppi;
+       struct ndis_tcp_ip_checksum_info *csum_info;
+       int  hdr_offset;
+       bool is_v4;
+       bool is_tcp;
+       bool is_udp;
+
 
        /*
         * We will atmost need two pages to describe the rndis
@@ -338,6 +374,35 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct 
net_device *net)
                                VLAN_PRIO_SHIFT;
        }
 
+       if (!get_net_transport_info(skb, &is_v4, &is_tcp, &is_udp, &hdr_offset))
+               goto do_send;
+       /*
+        * Setup the sendside checksum offload only if this is not a
+        * GSO packet.
+        */
+       if (skb_is_gso(skb))
+               goto do_send;
+
+       rndis_msg_size += NDIS_CSUM_PPI_SIZE;
+       ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
+                               TCPIP_CHKSUM_PKTINFO);
+
+       csum_info = (struct ndis_tcp_ip_checksum_info *)((ulong)ppi +
+                       ppi->ppi_offset);
+
+       if (is_v4)
+               csum_info->transmit.is_ipv4 = 1;
+       else
+               csum_info->transmit.is_ipv6 = 1;
+
+       if (is_tcp) {
+               csum_info->transmit.tcp_checksum = 1;
+               csum_info->transmit.tcp_header_offset = hdr_offset;
+       } else if (is_udp) {
+               csum_info->transmit.udp_checksum = 1;
+       }
+
+do_send:
        /* Start filling in the page buffers with the rndis hdr */
        rndis_msg->msg_len += rndis_msg_size;
        packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
@@ -593,8 +658,9 @@ 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;
-       net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM;
+       net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM;
+       net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM |
+                       NETIF_F_IP_CSUM;
 
        SET_ETHTOOL_OPS(net, &ethtool_ops);
        SET_NETDEV_DEV(net, &dev->device);
-- 
1.7.4.1

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