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ibmveth: Add support for Large Receive Offload

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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>
This commit is contained in:
Thomas Falcon 2015-04-29 16:25:47 -05:00 committed by David S. Miller
parent 92ec8279f5
commit 9c7e8bc584
2 changed files with 17 additions and 1 deletions
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17
drivers/net/ethernet/ibm/ibmveth.c
View file

@ -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 */

1
drivers/net/ethernet/ibm/ibmveth.h
View file

@ -162,6 +162,7 @@ struct ibmveth_adapter {
u64 tx_map_failed;
u64 tx_send_failed;
u64 tx_large_packets;
u64 rx_large_packets;
};
/*