5.15-stable review patch. If anyone has any objections, please let me know.
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From: David Wilder dwilder@us.ibm.com
[ Upstream commit 51e7a66666e0ca9642c59464ef8359f0ac604d41 ]
In some OVS environments the TCP pseudo header checksum may need to be recomputed. Currently this is only done when the interface instance is configured for "Trunk Mode". We found the issue also occurs in some Kubernetes environments, these environments do not use "Trunk Mode", therefor the condition is removed.
Performance tests with this change show only a fractional decrease in throughput (< 0.2%).
Fixes: 7525de2516fb ("ibmveth: Set CHECKSUM_PARTIAL if NULL TCP CSUM.") Signed-off-by: David Wilder dwilder@us.ibm.com Reviewed-by: Nick Child nnac123@linux.ibm.com Reviewed-by: Jacob Keller jacob.e.keller@intel.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/ibm/ibmveth.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-)
diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c index 05759f690e1fd..67ea2cb21e849 100644 --- a/drivers/net/ethernet/ibm/ibmveth.c +++ b/drivers/net/ethernet/ibm/ibmveth.c @@ -1297,24 +1297,23 @@ static void ibmveth_rx_csum_helper(struct sk_buff *skb, * the user space for finding a flow. During this process, OVS computes * checksum on the first packet when CHECKSUM_PARTIAL flag is set. * - * So, re-compute TCP pseudo header checksum when configured for - * trunk mode. + * So, re-compute TCP pseudo header checksum. */ + if (iph_proto == IPPROTO_TCP) { struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen); + if (tcph->check == 0x0000) { /* Recompute TCP pseudo header checksum */ - if (adapter->is_active_trunk) { - tcphdrlen = skb->len - iphlen; - if (skb_proto == ETH_P_IP) - tcph->check = - ~csum_tcpudp_magic(iph->saddr, - iph->daddr, tcphdrlen, iph_proto, 0); - else if (skb_proto == ETH_P_IPV6) - tcph->check = - ~csum_ipv6_magic(&iph6->saddr, - &iph6->daddr, tcphdrlen, iph_proto, 0); - } + tcphdrlen = skb->len - iphlen; + if (skb_proto == ETH_P_IP) + tcph->check = + ~csum_tcpudp_magic(iph->saddr, + iph->daddr, tcphdrlen, iph_proto, 0); + else if (skb_proto == ETH_P_IPV6) + tcph->check = + ~csum_ipv6_magic(&iph6->saddr, + &iph6->daddr, tcphdrlen, iph_proto, 0); /* Setup SKB fields for checksum offload */ skb_partial_csum_set(skb, iphlen, offsetof(struct tcphdr, check));