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| author | Amir Vadai | 2012-04-04 23:33:31 +0200 |
|---|---|---|
| committer | David S. Miller | 2012-04-05 11:08:04 +0200 |
| commit | 109d2446052a484c58f07f71f9457bf7b71017f8 (patch) | |
| tree | 523e1c3f51e85c581614fb262654456486586cd3 /drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c | |
| parent | net/dcb: Add an optional max rate attribute (diff) | |
| download | kernel-qcow2-linux-109d2446052a484c58f07f71f9457bf7b71017f8.tar.gz kernel-qcow2-linux-109d2446052a484c58f07f71f9457bf7b71017f8.tar.xz kernel-qcow2-linux-109d2446052a484c58f07f71f9457bf7b71017f8.zip | |
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>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c b/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c index 6892320adaf7..0cc6c9651473 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c @@ -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, |