linux-kernel - Re: [PATCH 04/10] net: stmmac: sunxi platfrom extensions for GMAC in Allwinner A20 SoC's

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 12 Dec 2013 18:31:43 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Srinivas KANDAGATLA <srinivas.kandagatla@...com>
Cc:	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	netdev <netdev@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	devicetree <devicetree@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 04/10] net: stmmac: sunxi platfrom extensions for GMAC in
 Allwinner A20 SoC's

Hi,

On Thu, Dec 12, 2013 at 5:04 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> Hi,
>
> On Wed, Dec 11, 2013 at 02:45:08PM +0000, srinivas kandagatla wrote:
>> >>> 1. .tx_coe
>> >>>    This is not exported in the DT bindings.
>> >>>    Looking at stmmac code, not setting this seems to disable all
>> >>>    checksum offloading.
>> >>
>> >> Why cant this go via DT as well?
>> >
>> > If you and Giuseppe are OK with this, why not?
>> Am Ok with it.
>
> Please note that I'm opposed to this until someone explain why putting
> it in the DT is relevant (and not just convenient).

Checksum offloading is an optional feature[1], implemented starting
from version 3.20a. It is not tied to a specific IP version. As such,
using a "snps,dwmac-<version>" compatible isn't a good fit here.

stmmac does auto-detection for optional features on MAC version > 3.50a.
This is what Srinivas was referring to.

Unfortunately, our MAC is < 3.50a. No auto-detection. We could add a
"snps,dwmac-tx-coe" compatible for this, or the seperate DT property.

The other way would be to pass the flags in the initial .data with the
SoC specific compatible. Other SoCs with the same feature won't be
able to reuse the same compatible though.


ChenYu

[1] http://www.synopsys.com/dw/dwtb.php?a=ethernet_mac
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/