[Linux-stm32] [PATCH net-next 5/8] net: dpaa2-mac: use resolved link config in mac_link_up()

[Ioana Ciornei]

> Subject: [PATCH net-next 5/8] net: dpaa2-mac: use resolved link config in
> mac_link_up()
> 
> Convert the DPAA2 ethernet driver to use the finalised link parameters in
> mac_link_up() rather than the parameters in mac_config(), which are more
> suited to the needs of the DPAA2 MC firmware than those available via
> mac_config().
> 
> Signed-off-by: Russell King <rmk+kernel at armlinux.org.uk>

Tested-by: Ioana Ciornei <ioana.ciornei at nxp.com>

> ---
>  .../net/ethernet/freescale/dpaa2/dpaa2-mac.c  | 54 +++++++++++--------
> .../net/ethernet/freescale/dpaa2/dpaa2-mac.h  |  1 +
>  2 files changed, 33 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
> b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
> index 3a75c5b58f95..3ee236c5fc37 100644
> --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
> +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
> @@ -123,35 +123,16 @@ static void dpaa2_mac_config(struct phylink_config
> *config, unsigned int mode,
>  	struct dpmac_link_state *dpmac_state = &mac->state;
>  	int err;
> 
> -	if (state->speed != SPEED_UNKNOWN)
> -		dpmac_state->rate = state->speed;
> -
> -	if (state->duplex != DUPLEX_UNKNOWN) {
> -		if (!state->duplex)
> -			dpmac_state->options |=
> DPMAC_LINK_OPT_HALF_DUPLEX;
> -		else
> -			dpmac_state->options &=
> ~DPMAC_LINK_OPT_HALF_DUPLEX;
> -	}
> -
>  	if (state->an_enabled)
>  		dpmac_state->options |= DPMAC_LINK_OPT_AUTONEG;
>  	else
>  		dpmac_state->options &= ~DPMAC_LINK_OPT_AUTONEG;
> 
> -	if (state->pause & MLO_PAUSE_RX)
> -		dpmac_state->options |= DPMAC_LINK_OPT_PAUSE;
> -	else
> -		dpmac_state->options &= ~DPMAC_LINK_OPT_PAUSE;
> -
> -	if (!!(state->pause & MLO_PAUSE_RX) ^ !!(state->pause &
> MLO_PAUSE_TX))
> -		dpmac_state->options |= DPMAC_LINK_OPT_ASYM_PAUSE;
> -	else
> -		dpmac_state->options &= ~DPMAC_LINK_OPT_ASYM_PAUSE;
> -
>  	err = dpmac_set_link_state(mac->mc_io, 0,
>  				   mac->mc_dev->mc_handle, dpmac_state);
>  	if (err)
> -		netdev_err(mac->net_dev, "dpmac_set_link_state() = %d\n",
> err);
> +		netdev_err(mac->net_dev, "%s: dpmac_set_link_state() =
> %d\n",
> +			   __func__, err);
>  }
> 
>  static void dpaa2_mac_link_up(struct phylink_config *config, @@ -165,10
> +146,37 @@ static void dpaa2_mac_link_up(struct phylink_config *config,
>  	int err;
> 
>  	dpmac_state->up = 1;
> +
> +	if (mac->if_link_type == DPMAC_LINK_TYPE_PHY) {
> +		/* If the DPMAC is configured for PHY mode, we need
> +		 * to pass the link parameters to the MC firmware.
> +		 */
> +		dpmac_state->rate = speed;
> +
> +		if (duplex == DUPLEX_HALF)
> +			dpmac_state->options |=
> DPMAC_LINK_OPT_HALF_DUPLEX;
> +		else if (duplex == DUPLEX_FULL)
> +			dpmac_state->options &=
> ~DPMAC_LINK_OPT_HALF_DUPLEX;
> +
> +		/* This is lossy; the firmware really should take the pause
> +		 * enablement status rather than pause/asym pause status.
> +		 */

In what sense it's lossy? I cannot see how information can be lost by translating the rx/tx pause state to pause/asym.
If it's just about the unnecessary double translation, then I agree.. this could have been done in an easier manner.


> +		if (rx_pause)
> +			dpmac_state->options |= DPMAC_LINK_OPT_PAUSE;
> +		else
> +			dpmac_state->options &= ~DPMAC_LINK_OPT_PAUSE;
> +
> +		if (rx_pause ^ tx_pause)
> +			dpmac_state->options |=
> DPMAC_LINK_OPT_ASYM_PAUSE;
> +		else
> +			dpmac_state->options &=
> ~DPMAC_LINK_OPT_ASYM_PAUSE;
> +	}
> +
>  	err = dpmac_set_link_state(mac->mc_io, 0,
>  				   mac->mc_dev->mc_handle, dpmac_state);
>  	if (err)
> -		netdev_err(mac->net_dev, "dpmac_set_link_state() = %d\n",
> err);
> +		netdev_err(mac->net_dev, "%s: dpmac_set_link_state() =
> %d\n",
> +			   __func__, err);
>  }
> 
>  static void dpaa2_mac_link_down(struct phylink_config *config, @@ -241,6
> +249,8 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
>  		goto err_close_dpmac;
>  	}
> 
> +	mac->if_link_type = attr.link_type;
> +
>  	dpmac_node = dpaa2_mac_get_node(attr.id);
>  	if (!dpmac_node) {
>  		netdev_err(net_dev, "No dpmac@%d node found.\n", attr.id);
> diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h
> b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h
> index 4da8079b9155..2130d9c7d40e 100644
> --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h
> +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h
> @@ -20,6 +20,7 @@ struct dpaa2_mac {
>  	struct phylink_config phylink_config;
>  	struct phylink *phylink;
>  	phy_interface_t if_mode;
> +	enum dpmac_link_type if_link_type;
>  };
> 
>  bool dpaa2_mac_is_type_fixed(struct fsl_mc_device *dpmac_dev,
> --
> 2.20.1