Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 109d2446 authored by Amir Vadai's avatar Amir Vadai Committed by David S. Miller
Browse files

net/mlx4_en: Set max rate-limit for a TC 



This patch is using the DCB netlink to set rate limit per ETS TC
Values are accepted in Kbps and rounded up to the nearest multiply of 100Mbps.

Signed-off-by: default avatarAmir Vadai <amirv@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 08f10aff

drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c

+45 −0
Original line number Diff line number Diff line
@@ -100,6 +100,7 @@ static int mlx4_en_config_port_scheduler(struct mlx4_en_priv *priv, 
	__u8 pg[IEEE_8021QAZ_MAX_TCS] = { 0 };



	ets = ets ?: &priv->ets;

	ratelimit = ratelimit ?: priv->maxrate;



	/* higher TC means higher priority => lower pg */

	for (i = IEEE_8021QAZ_MAX_TCS - 1; i >= 0; i--) {
@@ -198,9 +199,53 @@ static u8 mlx4_en_dcbnl_setdcbx(struct net_device *dev, u8 mode) 
	return 0;

}



#define MLX4_RATELIMIT_UNITS_IN_KB 100000 /* rate-limit HW unit in Kbps */

static int mlx4_en_dcbnl_ieee_getmaxrate(struct net_device *dev,

				   struct ieee_maxrate *maxrate)

{

	struct mlx4_en_priv *priv = netdev_priv(dev);

	int i;



	if (!priv->maxrate)

		return -EINVAL;



	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)

		maxrate->tc_maxrate[i] =

			priv->maxrate[i] * MLX4_RATELIMIT_UNITS_IN_KB;



	return 0;

}



static int mlx4_en_dcbnl_ieee_setmaxrate(struct net_device *dev,

		struct ieee_maxrate *maxrate)

{

	struct mlx4_en_priv *priv = netdev_priv(dev);

	u16 tmp[IEEE_8021QAZ_MAX_TCS];

	int i, err;



	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {

		/* Convert from Kbps into HW units, rounding result up.

		 * Setting to 0, means unlimited BW.

		 */

		tmp[i] =

			(maxrate->tc_maxrate[i] + MLX4_RATELIMIT_UNITS_IN_KB -

			 1) / MLX4_RATELIMIT_UNITS_IN_KB;

	}



	err = mlx4_en_config_port_scheduler(priv, NULL, tmp);

	if (err)

		return err;



	memcpy(priv->maxrate, tmp, sizeof(*priv->maxrate));



	return 0;

}



const struct dcbnl_rtnl_ops mlx4_en_dcbnl_ops = {

	.ieee_getets	= mlx4_en_dcbnl_ieee_getets,

	.ieee_setets	= mlx4_en_dcbnl_ieee_setets,

	.ieee_getmaxrate = mlx4_en_dcbnl_ieee_getmaxrate,

	.ieee_setmaxrate = mlx4_en_dcbnl_ieee_setmaxrate,

	.ieee_getpfc	= mlx4_en_dcbnl_ieee_getpfc,

	.ieee_setpfc	= mlx4_en_dcbnl_ieee_setpfc,

drivers/net/ethernet/mellanox/mlx4/mlx4_en.h

+1 −0
Original line number Diff line number Diff line
@@ -499,6 +499,7 @@ struct mlx4_en_priv { 


#ifdef CONFIG_MLX4_EN_DCB

	struct ieee_ets ets;

	u16 maxrate[IEEE_8021QAZ_MAX_TCS];

#endif

};