ibmveth: Add support for Large Receive Offload
Enables receiving large packets from other LPARs. These packets
have a -1 IP header checksum, so we must recalculate to have
a valid checksum.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index 33ffd34..29bbb62 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -101,6 +101,7 @@
{ "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 @@
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 @@
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 */
diff --git a/drivers/net/ethernet/ibm/ibmveth.h b/drivers/net/ethernet/ibm/ibmveth.h
index 56d1e22..41dedb1 100644
--- a/drivers/net/ethernet/ibm/ibmveth.h
+++ b/drivers/net/ethernet/ibm/ibmveth.h
@@ -162,6 +162,7 @@
u64 tx_map_failed;
u64 tx_send_failed;
u64 tx_large_packets;
+ u64 rx_large_packets;
};
/*