linux-kernel - RE: [PATCH iwl-net] igc: Fix hicredit calculation

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Message-ID: <DM4PR11MB60941A401AF5BF6B70473A768489A@DM4PR11MB6094.namprd11.prod.outlook.com>
Date:   Sat, 9 Dec 2023 17:22:10 +0000
From:   "Chilakala, Mallikarjuna" <mallikarjuna.chilakala@...el.com>
To:     "Gomes, Vinicius" <vinicius.gomes@...el.com>,
        Rodrigo Cataldo via B4 Relay 
        <devnull+rodrigo.cadore.l-acoustics.com@...nel.org>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <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>
CC:     "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Kurt Kanzenbach" <kurt@...utronix.de>,
        Rodrigo Cataldo <rodrigo.cadore@...coustics.com>
Subject: RE: [PATCH iwl-net] igc: Fix hicredit calculation

Rodrigo Cataldo via B4 Relay
<devnull+rodrigo.cadore.l-acoustics.com@...nel.org> writes:

> 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>
> ---

Looks good to me!
Acked-by: Malli Chilakala <mallikarjuna.chilakala@...el.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(-)
>
> diff --git a/drivers/net/ethernet/intel/igc/igc_tsn.c 
> b/drivers/net/ethernet/intel/igc/igc_tsn.c
> index a9c08321aca9..22cefb1eeedf 100644
> --- a/drivers/net/ethernet/intel/igc/igc_tsn.c
> +++ b/drivers/net/ethernet/intel/igc/igc_tsn.c
> @@ -227,7 +227,7 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter)
>  			wr32(IGC_TQAVCC(i), tqavcc);
>  
>  			wr32(IGC_TQAVHC(i),
> -			     0x80000000 + ring->hicredit * 0x7735);
> +			     0x80000000 + ring->hicredit * 0x7736);
>  		} else {
>  			/* Disable any CBS for the queue */
>  			txqctl &= ~(IGC_TXQCTL_QAV_SEL_MASK);
>
> ---
> base-commit: 2078a341f5f609d55667c2dc6337f90d8f322b8f
> change-id: 20231206-igc-fix-hicredit-calc-028bf73c50a8
>
> Best regards,
> --
> Rodrigo Cataldo <rodrigo.cadore@...coustics.com>
>