This is a note to let you know that I've just added the patch titled

vxlan: vxlan dev should inherit lowerdev's gso_max_size

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: vxlan-vxlan-dev-should-inherit-lowerdev-s-gso_max_size.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Sun Mar 18 16:55:33 CET 2018

From: Felix Manlunas felix.manlunas@cavium.com Date: Wed, 29 Mar 2017 17:56:43 -0700 Subject: vxlan: vxlan dev should inherit lowerdev's gso_max_size

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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/vxlan.c | 5 +++++ 1 file changed, 5 insertions(+)

--- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -2912,6 +2912,11 @@ static int vxlan_dev_configure(struct ne 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)

Patches currently in stable-queue which might be from felix.manlunas@cavium.com are

queue-4.9/vxlan-vxlan-dev-should-inherit-lowerdev-s-gso_max_size.patch