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Commit d6acfeb1 authored by Felix Manlunas's avatar Felix Manlunas Committed by David S. Miller
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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: default avatarFelix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: default avatarSatanand Burla <satananda.burla@cavium.com>
Signed-off-by: default avatarDavid 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;