[PATCH AUTOSEL for 4.4 045/115] vxlan: vxlan dev should inherit lowerdev's gso_max_size
From: Sasha Levin
Date: Sat Mar 03 2018 - 18:12:51 EST
From: Felix Manlunas <felix.manlunas@xxxxxxxxxx>
[ 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@xxxxxxxxxx>
Signed-off-by: Satanand Burla <satananda.burla@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
drivers/net/vxlan.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index dab3bf6649e6..e4ff1e45c02e 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)
--
2.14.1