linux-kernel - Re: [RFC net-next v1 3/5] net: phy: nxp-c45-tja11xx add MACsec support

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Message-ID: <ZNfJEj0jiTR0ZAbK@vergenet.net>
Date:   Sat, 12 Aug 2023 20:01:54 +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,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC net-next v1 3/5] net: phy: nxp-c45-tja11xx add MACsec
 support

On Fri, Aug 11, 2023 at 06:32:47PM +0300, Radu Pirea (NXP OSS) wrote:
> Add MACsec support.
> 
> Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@....nxp.com>

Hi Radu,

thanks for your patch-set.
Some minor feedback from my side.

...

> diff --git a/drivers/net/phy/nxp-c45-tja11xx-macsec.c b/drivers/net/phy/nxp-c45-tja11xx-macsec.c

...

> +static int nxp_c45_tx_sc_set_flt(struct macsec_context *ctx,  int secy_id)
> +{
> +	u32 tx_flt_base = TX_FLT_BASE(secy_id);
> +	const u8 *dev_addr = ctx->secy->netdev->dev_addr;
> +	u32 mac_sa;

nit: Please use reverse xmas tree - longest line to shortest
     ordering for local variable declarations in Networking code.

     https://github.com/ecree-solarflare/xmastree is your friend here.

> +
> +	mac_sa = dev_addr[0] << 8 | dev_addr[1];
> +	nxp_c45_macsec_write(ctx->phydev,
> +			     TX_SC_FLT_MAC_DA_SA(tx_flt_base),
> +			     mac_sa);
> +	mac_sa = dev_addr[5] | dev_addr[4] << 8 |
> +		dev_addr[3] << 16 | dev_addr[2] << 24;
> +
> +	nxp_c45_macsec_write(ctx->phydev,
> +			     TX_SC_FLT_MAC_SA(tx_flt_base),
> +			     mac_sa);
> +	nxp_c45_macsec_write(ctx->phydev,
> +			     TX_SC_FLT_MAC_CFG(tx_flt_base),
> +			     TX_SC_FLT_BY_SA | TX_SC_FLT_EN |
> +			     secy_id);
> +
> +	return 0;
> +}
> +
> +static bool nxp_c45_port_valid(struct nxp_c45_secy *phy_secy, u16 port)
> +{
> +	if (phy_secy->secy->tx_sc.end_station && __be16_to_cpu(port) != 1)

The type of port is host byte order, but it is assumed to be big endian
by passing it to __be16_to_cpu(). Also, it's probably more efficient
to convert the constant (1).

There are a number of other Sparse warnings introduced by this patch.
Please take a look over them (and ideally fix them).

> +		return false;
> +
> +	return true;
> +}

...

> +static int nxp_c45_mdo_upd_secy(struct macsec_context *ctx)
> +{
> +	struct phy_device *phydev = ctx->phydev;
> +	struct nxp_c45_phy *priv = phydev->priv;
> +	struct nxp_c45_tx_sa *new_tx_sa, *old_tx_sa;

nit: reverse xmas tree

...