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net: fs_enet: make rx_copybreak value configurable

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Measurement shows that on a MPC8xx running at 132MHz, the optimal
limit is 112:
* 114 bytes packets are processed in 147 TB ticks with higher copybreak
* 114 bytes packets are processed in 148 TB ticks with lower copybreak
* 128 bytes packets are processed in 154 TB ticks with higher copybreak
* 128 bytes packets are processed in 148 TB ticks with lower copybreak
* 238 bytes packets are processed in 172 TB ticks with higher copybreak
* 238 bytes packets are processed in 148 TB ticks with lower copybreak

However it might be different on other processors
and/or frequencies. So it is useful to make it configurable.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christophe Leroy 2016-09-09 14:26:25 +02:00 committed by David S. Miller
parent 070e1f0182
commit b0ba357bfb
1 changed files with 40 additions and 0 deletions
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40
drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
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@ -830,6 +830,44 @@ static void fs_set_msglevel(struct net_device *dev, u32 value)
fep->msg_enable = value;
}
static int fs_get_tunable(struct net_device *dev,
const struct ethtool_tunable *tuna, void *data)
{
struct fs_enet_private *fep = netdev_priv(dev);
struct fs_platform_info *fpi = fep->fpi;
int ret = 0;
switch (tuna->id) {
case ETHTOOL_RX_COPYBREAK:
*(u32 *)data = fpi->rx_copybreak;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int fs_set_tunable(struct net_device *dev,
const struct ethtool_tunable *tuna, const void *data)
{
struct fs_enet_private *fep = netdev_priv(dev);
struct fs_platform_info *fpi = fep->fpi;
int ret = 0;
switch (tuna->id) {
case ETHTOOL_RX_COPYBREAK:
fpi->rx_copybreak = *(u32 *)data;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static const struct ethtool_ops fs_ethtool_ops = {
.get_drvinfo = fs_get_drvinfo,
.get_regs_len = fs_get_regs_len,
@ -841,6 +879,8 @@ static const struct ethtool_ops fs_ethtool_ops = {
.get_ts_info = ethtool_op_get_ts_info,
.get_link_ksettings = phy_ethtool_get_link_ksettings,
.set_link_ksettings = phy_ethtool_set_link_ksettings,
.get_tunable = fs_get_tunable,
.set_tunable = fs_set_tunable,
};
static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)