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Commit b0ba357b authored by Christophe Leroy's avatar Christophe Leroy Committed by David S. Miller
Browse files

net: fs_enet: make rx_copybreak value configurable 



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: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 070e1f01

drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c

+40 −0
Original line number Diff line number Diff line
@@ -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)