diff options
author | Jason Wang <jasowang@redhat.com> | 2011-06-10 00:56:17 +0000 |
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committer | David S. Miller <davem@davemloft.net> | 2011-06-11 15:57:47 -0700 |
commit | 10a8d94a95742bb15b4e617ee9884bb4381362be (patch) | |
tree | 768f2d92be0e12bca791bcb901ad4bdedc7d8a76 /net/packet/af_packet.c | |
parent | 40d15cd06e87722b1cc27d56c8274617580f2c56 (diff) | |
download | linux-10a8d94a95742bb15b4e617ee9884bb4381362be.tar.gz |
virtio_net: introduce VIRTIO_NET_HDR_F_DATA_VALID
There's no need for the guest to validate the checksum if it have been validated by host nics. So this patch introduces a new flag - VIRTIO_NET_HDR_F_DATA_VALID which is used to bypass the checksum examing in guest. The backend (tap/macvtap) may set this flag when met skbs with CHECKSUM_UNNECESSARY to save cpu utilization. No feature negotiation is needed as old driver just ignore this flag. Iperf shows 12%-30% performance improvement for UDP traffic. For TCP, when gro is on no difference as it produces skb with partial checksum. But when gro is disabled, 20% or even higher improvement could be measured by netperf. Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet/af_packet.c')
-rw-r--r-- | net/packet/af_packet.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 67f6749a0a45..b54ec41adea9 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -1685,6 +1685,8 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; vnet_hdr.csum_start = skb_checksum_start_offset(skb); vnet_hdr.csum_offset = skb->csum_offset; + } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { + vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID; } /* else everything is zero */ err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, |