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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: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amir Vadai 2012-04-04 21:33:31 +00:00 committed by David S. Miller
parent 08f10affe4
commit 109d244605
2 changed files with 46 additions and 0 deletions
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45
drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c
View File

@ -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,

1
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
View File

@ -499,6 +499,7 @@ struct mlx4_en_priv {
#ifdef CONFIG_MLX4_EN_DCB
struct ieee_ets ets;
u16 maxrate[IEEE_8021QAZ_MAX_TCS];
#endif
};