Commit d6acfeb1 authored Mar 29, 2017 by Felix Manlunas Committed by David S. Miller Apr 01, 2017

vxlan: vxlan dev should inherit lowerdev's gso_max_size



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>

parent 6c7c98ba

drivers/net/vxlan.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -2926,6 +2926,11 @@ 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) {
		int max_mtu = ETH_MAX_MTU;

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