Patch "vxlan: vxlan dev should inherit lowerdev's gso_max_size" has been added to the 4.9-stable tree

Patch "vxlan: vxlan dev should inherit lowerdev's gso_max_size" has been added to the 4.9-stable tree

[gregkh]

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;a=summary

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