linux-kernel - Re: [PATCH] net: stmmac: add dcrs parameter

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Message-ID: <CAOwfj2MMJCYyqD9++MpbRZohzBXyX16fJY-FaT+8H2gZyJd9MA@mail.gmail.com>
Date:	Tue, 26 Aug 2014 07:35:53 -0500
From:	Vince Bridgers <vbridgers2013@...il.com>
To:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
Cc:	Chen-Yu Tsai <wens@...e.org>, Ley Foon Tan <lftan@...era.com>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	LeyFoon Tan <lftan.linux@...il.com>,
	Vince Bridgers <vbridger@...era.com>
Subject: Re: [PATCH] net: stmmac: add dcrs parameter

Hi Peppe,

>>
>> In the Synopsys EMAC case, carrier sense is used to stop transmitting
>> if no carrier is sensed during a transmission. This is only useful if
>> the media in use is true half duplex media (like obsolete 10Base2 or
>> 10Base5). If no one in using true half duplex media, then is it
>> possible to set this disable by default? If we're not sure, then
>> having an option feels like the right thing to do.
>
>
> Indeed this is what I had done in the patch.
>
> http://git.stlinux.com/?p=stm/linux-sh4-2.6.32.y.git;a=commit;h=b0b863bf65c36dc593f6b7b4b418394fd880dae2
>
> Also in case of carrier sense the frame will be dropped in any case
> later.
>
> Let me know if you Acked this patch so I will rebase it on
> net.git and I send it soon
>
> peppe
>

Yes, this looks good to me. I don't expect anyone is using 10Base2 or
10Base5 anymore, so it's ok to disable DCRS by default.

ack

All the best,

Vince
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