netdev - Re: Regression: TCP connections fail over wireless: bad cksum?

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Date:	Thu, 04 Sep 2014 16:28:07 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ted Percival <ted@...p.id.au>
Cc:	netdev@...r.kernel.org
Subject: Re: Regression: TCP connections fail over wireless: bad cksum?

On Thu, 2014-09-04 at 17:21 -0600, Ted Percival wrote:

> # ethtool -k wlan0
> Features for wlan0:
> rx-checksumming: off [fixed]
> tx-checksumming: off
> 	tx-checksum-ipv4: off [fixed]
> 	tx-checksum-ip-generic: off [fixed]
> 	tx-checksum-ipv6: off [fixed]
> 	tx-checksum-fcoe-crc: off [fixed]
> 	tx-checksum-sctp: off [fixed]
> scatter-gather: off
> 	tx-scatter-gather: off [fixed]
> 	tx-scatter-gather-fraglist: off [fixed]
> tcp-segmentation-offload: off
> 	tx-tcp-segmentation: off [fixed]
> 	tx-tcp-ecn-segmentation: off [fixed]
> 	tx-tcp6-segmentation: off [fixed]
> udp-fragmentation-offload: off [fixed]
> generic-segmentation-offload: off [requested on]
> generic-receive-offload: on
> large-receive-offload: off [fixed]
> rx-vlan-offload: off [fixed]
> tx-vlan-offload: off [fixed]
> ntuple-filters: off [fixed]
> receive-hashing: off [fixed]
> highdma: off [fixed]
> rx-vlan-filter: off [fixed]
> vlan-challenged: off [fixed]
> tx-lockless: off [fixed]
> netns-local: on [fixed]
> tx-gso-robust: off [fixed]
> tx-fcoe-segmentation: off [fixed]
> tx-gre-segmentation: off [fixed]
> tx-ipip-segmentation: off [fixed]
> tx-sit-segmentation: off [fixed]
> tx-udp_tnl-segmentation: off [fixed]
> tx-mpls-segmentation: off [fixed]
> fcoe-mtu: off [fixed]
> tx-nocache-copy: off
> loopback: off [fixed]
> rx-fcs: off [fixed]
> rx-all: off [fixed]
> tx-vlan-stag-hw-insert: off [fixed]
> rx-vlan-stag-hw-parse: off [fixed]
> rx-vlan-stag-filter: off [fixed]
> l2-fwd-offload: off [fixed]
> busy-poll: off [fixed]
> 
> # ethtool -K wlan0 tx off
> Cannot change tx-checksumming
> 
> I will try to isolate the commit that caused the regression.

Ah well, I guess we know it ;)

tc -s -d qd show dev wlan0

tc qdisc replace dev wlan0 fq

This should temporarily help.


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