linux-kernel - Re: [Intel-wired-lan] [PATCH iwl-net] igc: Fix hicredit calculation

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Date: Thu, 28 Dec 2023 11:24:21 +0200
From: "naamax.meir" <naamax.meir@...ux.intel.com>
To: rodrigo.cadore@...coustics.com,
 Jesse Brandeburg <jesse.brandeburg@...el.com>,
 Tony Nguyen <anthony.l.nguyen@...el.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Aravindhan Gunasekaran <aravindhan.gunasekaran@...el.com>,
 Mallikarjuna Chilakala <mallikarjuna.chilakala@...el.com>,
 Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc: netdev@...r.kernel.org, Kurt Kanzenbach <kurt@...utronix.de>,
 intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [Intel-wired-lan] [PATCH iwl-net] igc: Fix hicredit calculation

On 12/8/2023 16:58, Rodrigo Cataldo via B4 Relay wrote:
> From: Rodrigo Cataldo <rodrigo.cadore@...coustics.com>
> 
> According to the Intel Software Manual for I225, Section 7.5.2.7,
> hicredit should be multiplied by the constant link-rate value, 0x7736.
> 
> Currently, the old constant link-rate value, 0x7735, from the boards
> supported on igb are being used, most likely due to a copy'n'paste, as
> the rest of the logic is the same for both drivers.
> 
> Update hicredit accordingly.
> 
> Fixes: 1ab011b0bf07 ("igc: Add support for CBS offloading")
> Reviewed-by: Kurt Kanzenbach <kurt@...utronix.de>
> Signed-off-by: Rodrigo Cataldo <rodrigo.cadore@...coustics.com>
> ---
> This is a simple fix for the credit calculation on igc devices
> (i225/i226) to match the Intel software manual.
> 
> This is my first contribution to the Linux Kernel. Apologies for any
> mistakes and let me know if I improve anything.
> ---
>   drivers/net/ethernet/intel/igc/igc_tsn.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

Tested-by: Naama Meir <naamax.meir@...ux.intel.com>