netdev - Re: [REGRESSION, bisect]cxgb4 port failure with TSO traffic after commit 10d3be569243def8("tcp-tso: do not split TSO packets at retransmit time")

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Message-ID: <1467024617.6850.148.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Mon, 27 Jun 2016 12:50:17 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Arjun V <arjun@...lsio.com>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Hariprasad S <hariprasad@...lsio.com>,
	Casey Leedom <leedom@...lsio.com>,
	Kumar A S <kumaras@...lsio.com>,
	Santosh Rastapur <santosh@...lsio.com>,
	Nirranjan Kirubaharan <nirranjan@...lsio.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"ycheng@...gle.com" <ycheng@...gle.com>
Subject: Re: [REGRESSION, bisect]cxgb4 port failure with TSO traffic after
 commit 10d3be569243def8("tcp-tso: do not split TSO packets at retransmit
 time")

On Mon, 2016-06-27 at 15:24 +0530, Arjun V wrote:

> Applied your patch.
> The above debug print is not getting invoked, when skb->len is greater than 65536.

Interesting.

It looks like we might have a bug in tcp_shift_skb_data() not respecting
sk->sk_gso_max_size at all ...

I will send a patch.

Thanks.