ibmveth: Add support for Large Receive Offload

[cascardo/linux.git] / drivers / net / ethernet / ibm / ibmveth.c

diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index 33ffd34..29bbb62 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -101,6 +101,7 @@ struct ibmveth_stat ibmveth_stats[] = {
        { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
        { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
        { "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
+       { "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) }
 };
 
 /* simple methods of getting data from the current rxq entry */
@@ -1094,6 +1095,7 @@ static int ibmveth_poll(struct napi_struct *napi, int budget)
        struct net_device *netdev = adapter->netdev;
        int frames_processed = 0;
        unsigned long lpar_rc;
+       struct iphdr *iph;
 
 restart_poll:
        while (frames_processed < budget) {
@@ -1136,8 +1138,21 @@ restart_poll:
                        skb_put(skb, length);
                        skb->protocol = eth_type_trans(skb, netdev);
 
-                       if (csum_good)
+                       if (csum_good) {
                                skb->ip_summed = CHECKSUM_UNNECESSARY;
+                               if (be16_to_cpu(skb->protocol) == ETH_P_IP) {
+                                       iph = (struct iphdr *)skb->data;
+
+                                       /* If the IP checksum is not offloaded and if the packet
+                                        *  is large send, the checksum must be rebuilt.
+                                        */
+                                       if (iph->check == 0xffff) {
+                                               iph->check = 0;
+                                               iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
+                                               adapter->rx_large_packets++;
+                                       }
+                               }
+                       }
 
                        napi_gro_receive(napi, skb);    /* send it up */