linux-kernel - Re: [RFC net-next v2 3/5] net: phy: nxp-c45-tja11xx add MACsec support

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Message-ID: <20230827080314.GQ3523530@kernel.org>
Date:   Sun, 27 Aug 2023 10:03:14 +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 3/5] net: phy: nxp-c45-tja11xx add MACsec
 support

On Thu, Aug 24, 2023 at 12:16:13PM +0300, Radu Pirea (NXP OSS) wrote:
> Add MACsec support.
> The MACsec block has four TX SCs and four RX SCs. The driver supports up
> to four SecY. Each SecY with one TX SC and one RX SC.
> The RX SCs can have two keys, key A and key B, written in hardware and
> enabled at the same time.
> The TX SCs can have two keys written in hardware, but only one can be
> active at a given time.
> On TX, the SC is selected using the MAC source address. Due of this
> selection mechanism, each offloaded netdev must have a unique MAC
> address.
> On RX, the SC is selected by SCI(found in SecTAG or calculated using MAC
> SA), or using RX SC 0 as implicit.
> 
> Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@....nxp.com>

...

> diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
> index c945ed9bd14b..ee53e2fdb968 100644
> --- a/drivers/net/phy/Makefile
> +++ b/drivers/net/phy/Makefile
> @@ -83,6 +83,10 @@ obj-$(CONFIG_MICROSEMI_PHY)	+= mscc/
>  obj-$(CONFIG_MOTORCOMM_PHY)	+= motorcomm.o
>  obj-$(CONFIG_NATIONAL_PHY)	+= national.o
>  obj-$(CONFIG_NCN26000_PHY)	+= ncn26000.o
> +nxp-c45-tja11xx-objs		+= nxp-c45-tja11xx.o

Hi Radu,

The coincidence of "nxp-c45-tja11x" on both sides of the "+=" operator
seems to cause a build failure (for x86_64 allmodconfig with gcc-13).

Circular drivers/net/phy/nxp-c45-tja11xx.o <- drivers/net/phy/nxp-c45-tja11xx.o dependency dropped.

> +ifdef CONFIG_MACSEC
> +nxp-c45-tja11xx-objs		+= nxp-c45-tja11xx-macsec.o
> +endif

>  obj-$(CONFIG_NXP_C45_TJA11XX_PHY)	+= nxp-c45-tja11xx.o
>  obj-$(CONFIG_NXP_CBTX_PHY)	+= nxp-cbtx.o
>  obj-$(CONFIG_NXP_TJA11XX_PHY)	+= nxp-tja11xx.o

...