netdev - Re: [PATCH v1 1/1] net: macb: Shorten max_tx_len to 4KiB

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Date:   Thu, 13 Apr 2023 15:36:19 -0500
From:   "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To:     <daire.mcnamara@...rochip.com>, <nicholas.ferre@...rochip.com>,
        <claudiu.beznea@...rochip.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>, <conor.dooley@...rochip.com>
Subject: Re: [PATCH v1 1/1] net: macb: Shorten max_tx_len to 4KiB - 56 on mpfs



On 4/13/2023 1:03 PM, 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: Sridhar Samudrala <sridhar.samudrala@...el.com>