linux-kernel - Re: [RFC net-next v2 5/5] net: phy: nxp-c45-tja11xx: implement mdo_insert_tx

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Message-ID: <20230827080531.GR3523530@kernel.org>
Date:   Sun, 27 Aug 2023 10:05:31 +0200
From:   Simon Horman <horms@...nel.org>
To:     "Radu Pirea (NXP OSS)" <radu-nicolae.pirea@....nxp.com>
Cc:     andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, richardcochran@...il.com, sd@...asysnail.net,
        sebastian.tobuschat@....com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC net-next v2 5/5] net: phy: nxp-c45-tja11xx: implement
 mdo_insert_tx_tag

On Thu, Aug 24, 2023 at 12:16:15PM +0300, Radu Pirea (NXP OSS) wrote:
> Implement mdo_insert_tx_tag to insert the TLV header in the ethernet
> frame.
> 
> If extscs parameter is set to 1, then the TLV header will contain the
> TX SC that will be used to encrypt the frame, otherwise the TX SC will
> be selected using the MAC source address.
> 
> Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@....nxp.com>
> ---
>  drivers/net/phy/nxp-c45-tja11xx-macsec.c | 66 ++++++++++++++++++++++++
>  1 file changed, 66 insertions(+)
> 
> diff --git a/drivers/net/phy/nxp-c45-tja11xx-macsec.c b/drivers/net/phy/nxp-c45-tja11xx-macsec.c

...

> @@ -167,6 +171,18 @@
>  #define MACSEC_INPBTS			0x0638
>  #define MACSEC_IPSNFS			0x063C
>  
> +#define TJA11XX_TLV_TX_NEEDED_HEADROOM	(32)
> +#define TJA11XX_TLV_NEEDED_TAILROOM	(0)
> +
> +#define MACSEC_TLV_CP			BIT(0)
> +#define MACSEC_TLV_SC_ID_OFF		(2)
> +
> +#define ETH_P_TJA11XX_TLV		(0x4e58)
> +
> +bool extscs;

Hi Radu,

Sparse suggests that extscs should be static.

> +module_param(extscs, bool, 0);
> +MODULE_PARM_DESC(extscs, "Select the TX SC using TLV header information.");

...