From: Felix Manlunas felix.manlunas@cavium.com
[ 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 felix.manlunas@cavium.com Signed-off-by: Satanand Burla satananda.burla@cavium.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- drivers/net/vxlan.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index 983e941bdf29..50570d779b01 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -2912,6 +2912,11 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev, return -EINVAL; }
+ 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)