netdev - Re: [PATCH net v2] net: stmmac: dwmac-qcom-ethqos: Configure host DMA width

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Date: Fri, 7 Jun 2024 12:31:11 +0100
From: Simon Horman <horms@...nel.org>
To: Sagar Cheluvegowda <quic_scheluve@...cinc.com>
Cc: Vinod Koul <vkoul@...nel.org>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Jochen Henneberg <jh@...neberg-systemdesign.com>,
	linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Andrew Lunn <andrew@...n.ch>, Andrew Halaney <ahalaney@...hat.com>
Subject: Re: [PATCH net v2] net: stmmac: dwmac-qcom-ethqos: Configure host
 DMA width

On Wed, Jun 05, 2024 at 11:57:18AM -0700, Sagar Cheluvegowda wrote:
> Commit 070246e4674b ("net: stmmac: Fix for mismatched host/device DMA
> address width") added support in the stmmac driver for platform drivers
> to indicate the host DMA width, but left it up to authors of the
> specific platforms to indicate if their width differed from the addr64
> register read from the MAC itself.
> 
> Qualcomm's EMAC4 integration supports only up to 36 bit width (as
> opposed to the addr64 register indicating 40 bit width). Let's indicate
> that in the platform driver to avoid a scenario where the driver will
> allocate descriptors of size that is supported by the CPU which in our
> case is 36 bit, but as the addr64 register is still capable of 40 bits
> the device will use two descriptors as one address.
> 
> Fixes: 8c4d92e82d50 ("net: stmmac: dwmac-qcom-ethqos: add support for emac4 on sa8775p platforms")
> Signed-off-by: Sagar Cheluvegowda <quic_scheluve@...cinc.com>
> ---
> Changes in v2:
> Fix commit message to include a commit body
> Replace the proper fixes tag
> Remove the change-Id
> - Link to v1: https://lore.kernel.org/r/20240529-configure_ethernet_host_dma_width-v1-1-3f2707851adf@quicinc.com

Thanks,

this change looks good to me - the usage of dma_addr_width is in line with
my understanding of how it is intended to be used.

And, AFAICS, the changes in v2 address the review of v1.

Reviewed-by: Simon Horman <horms@...nel.org>

...