netdev - Re: [PATCH v4 1/1] net: macb: Shorten max_tx_len to 4KiB

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Message-ID: <20230512-strive-stump-12d1eae2ba61@wendy>
Date: Fri, 12 May 2023 13:23:45 +0100
From: Conor Dooley <conor.dooley@...rochip.com>
To: <daire.mcnamara@...rochip.com>
CC: <nicolas.ferre@...rochip.com>, <claudiu.beznea@...rochip.com>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v4 1/1] net: macb: Shorten max_tx_len to 4KiB - 56 on mpfs

On Fri, May 12, 2023 at 01:20:32PM +0100, daire.mcnamara@...rochip.com wrote:
> From: Daire McNamara <daire.mcnamara@...rochip.com>
> 
> On mpfs, with SRAM configured for 4 queues, setting max_tx_len
> to GEM_TX_MAX_LEN=0x3f0 results multiple AMBA errors.
> Setting max_tx_len to (4KiB - 56) removes those errors.
> 
> The details are described in erratum 1686 by Cadence
> 
> The max jumbo frame size is also reduced for mpfs to (4KiB - 56).
> 
> Signed-off-by: Daire McNamara <daire.mcnamara@...rochip.com>

Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks,
Conor.

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