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Commit 9c7e8bc5 authored by Thomas Falcon's avatar Thomas Falcon Committed by David S. Miller
Browse files

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: default avatarBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: default avatarThomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 92ec8279

drivers/net/ethernet/ibm/ibmveth.c

+16 −1
Original line number Diff line number Diff line
@@ -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 @@ static int ibmveth_poll(struct napi_struct *napi, int budget) 
			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 */

drivers/net/ethernet/ibm/ibmveth.h

+1 −0
Original line number Diff line number Diff line
@@ -162,6 +162,7 @@ struct ibmveth_adapter { 
    u64 tx_map_failed;

    u64 tx_send_failed;

    u64 tx_large_packets;

    u64 rx_large_packets;

};



/*