linux-kernel - Re: [PATCH iwl-net] i40e: Fix wrong mask used during DCB config

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Message-ID: <20231205204858.GY50400@kernel.org>
Date:   Tue, 5 Dec 2023 20:48:58 +0000
From:   Simon Horman <horms@...nel.org>
To:     Ivan Vecera <ivecera@...hat.com>
Cc:     netdev@...r.kernel.org,
        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>,
        Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
        Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        "moderated list:INTEL ETHERNET DRIVERS" 
        <intel-wired-lan@...ts.osuosl.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH iwl-net] i40e: Fix wrong mask used during DCB config

On Thu, Nov 30, 2023 at 08:31:34PM +0100, Ivan Vecera wrote:
> Mask used for clearing PRTDCB_RETSTCC register in function
> i40e_dcb_hw_rx_ets_bw_config() is incorrect as there is used
> define I40E_PRTDCB_RETSTCC_ETSTC_SHIFT instead of define
> I40E_PRTDCB_RETSTCC_ETSTC_MASK.
> 
> The PRTDCB_RETSTCC register is used to configure whether ETS
> or strict priority is used as TSA in Rx for particular TC.
> 
> In practice it means that once the register is set to use ETS
> as TSA then it is not possible to switch back to strict priority
> without CoreR reset.
> 
> Fix the value in the clearing mask.
> 
> Fixes: 90bc8e003be2 ("i40e: Add hardware configuration for software based DCB")
> Signed-off-by: Ivan Vecera <ivecera@...hat.com>

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