From: Felix Manlunas Date: Thu, 30 Mar 2017 00:56:43 +0000 (-0700) Subject: vxlan: vxlan dev should inherit lowerdev's gso_max_size X-Git-Tag: v4.4.123~90 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=fb45f5f30a77b56e7f30594e2313b3f4368d6bf5;p=thirdparty%2Fkernel%2Fstable.git vxlan: vxlan dev should inherit lowerdev's gso_max_size [ Upstream commit d6acfeb17d030bb3907e77c048b0e7783ad8e5a9 ] vxlan dev currently ignores lowerdev's gso_max_size, which adversely affects TSO performance of liquidio if it's the lowerdev. Egress TCP packets' skb->len often exceed liquidio's advertised gso_max_size. This may happen on other NIC drivers. Fix it by assigning lowerdev's gso_max_size to that of vxlan dev. Might as well do likewise for gso_max_segs. Single flow TSO throughput of liquidio as lowerdev (using iperf3): Before the patch: 139 Mbps After the patch : 8.68 Gbps Percent increase: 6,144 % Signed-off-by: Felix Manlunas Signed-off-by: Satanand Burla Signed-off-by: David S. Miller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index dab3bf6649e61..e4ff1e45c02e1 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -2834,6 +2834,11 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev, needed_headroom = lowerdev->hard_header_len; } + if (lowerdev) { + dev->gso_max_size = lowerdev->gso_max_size; + dev->gso_max_segs = lowerdev->gso_max_segs; + } + if (conf->mtu) { err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false); if (err)