linux-kernel - Re: [PATCH 1/1] TX throttling bug-fixing patch of AX88179

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Message-ID: <CANEJEGvPc56ePP=_bxfA4PZfsM3vw=MsRjbWwrFBC3eP-GtzZg@mail.gmail.com>
Date:	Mon, 22 Jul 2013 11:29:16 -0700
From:	Grant Grundler <grundler@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Freddy Xin <freddy@...x.com.tw>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, linux-usb@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	ASIX Louis [蘇威陸] <louis@...x.com.tw>,
	Allan Chou <allan@...x.com.tw>
Subject: Re: [PATCH 1/1] TX throttling bug-fixing patch of AX88179_178A

On Mon, Jul 22, 2013 at 10:07 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
...
> I guess that if a driver does not advertise NETIF_F_SG, this
> skb_linearize() call is not needed : All frames reaching your xmit
> function should already be linear

As Ben Hutchings pointed out, hw_features is still setting this...but
I'm not sure how that matters.

ax88179_set_features() doesn't allow setting SG or TSO features.  But
I expect it would be "not too difficult" to add such that ethtool
could set those features after boot.  Or perhaps add a driver module
parameter to set these features.  I just guessing the skb_linearize()
could be removed until set_features support for SG and/or TSO is
added. Is that correct?

thanks,
grant
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