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

[Simon Horman <horms@kernel.org>]

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@oss.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.");

...