From: Christophe Leroy Date: Fri, 9 Sep 2016 12:26:25 +0000 (+0200) Subject: net: fs_enet: make rx_copybreak value configurable X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b0ba357bfb463bb10fe486c99c5dff892fa207fa;p=linux-beck.git 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: Christophe Leroy Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c index f2a60cd1feed..dc120c148d97 100644 --- a/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c +++ b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c @@ -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)