linux-kernel - Re: [PATCH net] net: mvneta: fix the Rx desc DMA address in the Rx path

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Message-Id: <20180623.104128.1481634742295696624.davem@davemloft.net>
Date:   Sat, 23 Jun 2018 10:41:28 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     antoine.tenart@...tlin.com
Cc:     gregory.clement@...tlin.com, mw@...ihalf.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com, maxime.chevallier@...tlin.com,
        miquel.raynal@...tlin.com, nadavh@...vell.com, stefanc@...vell.com,
        ymarkman@...vell.com
Subject: Re: [PATCH net] net: mvneta: fix the Rx desc DMA address in the Rx
 path

From: Antoine Tenart <antoine.tenart@...tlin.com>
Date: Fri, 22 Jun 2018 10:15:39 +0200

> When using s/w buffer management, buffers are allocated and DMA mapped.
> When doing so on an arm64 platform, an offset correction is applied on
> the DMA address, before storing it in an Rx descriptor. The issue is
> this DMA address is then used later in the Rx path without removing the
> offset correction. Thus the DMA address is wrong, which can led to
> various issues.
> 
> This patch fixes this by removing the offset correction from the DMA
> address retrieved from the Rx descriptor before using it in the Rx path.
> 
> Fixes: 8d5047cf9ca2 ("net: mvneta: Convert to be 64 bits compatible")
> Signed-off-by: Antoine Tenart <antoine.tenart@...tlin.com>

Applied and queued up for -stable, thank you.