netdev - Re: [PATCH 1/2] net: stmmac: don't set own bit too early for jumbo frames

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Date:   Fri, 15 Mar 2019 09:47:33 +0000
From:   Jose Abreu <jose.abreu@...opsys.com>
To:     Aaro Koskinen <aaro.koskinen@....fi>,
        "David S. Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <jose.abreu@...opsys.com>,
        Thor Thayer <thor.thayer@...ux.intel.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Aaro Koskinen <aaro.koskinen@...ia.com>
Subject: Re: [PATCH 1/2] net: stmmac: don't set own bit too early for jumbo
 frames

On 3/14/2019 7:43 PM, Aaro Koskinen wrote:
> From: Aaro Koskinen <aaro.koskinen@...ia.com>
> 
> Commit 0e80bdc9a72d ("stmmac: first frame prep at the end of xmit
> routine") overlooked jumbo frames when re-ordering the code, and as a
> result the own bit was not getting set anymore for the first jumbo frame
> descriptor. Commit 487e2e22ab79 ("net: stmmac: Set OWN bit for jumbo
> frames") tried to fix this, but now the bit is getting set too early and
> the DMA may start while we are still setting up the remaing descriptors.
> And with the chain mode the own bit remains still unset.
> 
> Fix by setting the own bit at the end of xmit also with jumbo frames.
> 
> Fixes: 0e80bdc9a72d ("stmmac: first frame prep at the end of xmit routine")
> Fixes: 487e2e22ab79 ("net: stmmac: Set OWN bit for jumbo frames")
> Signed-off-by: Aaro Koskinen <aaro.koskinen@...ia.com>

With Sergei comment fix:

Acked-by: Jose Abreu <joabreu@...opsys.com>

Thanks,
Jose Miguel Abreu