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ethtool: Add generic options for tunables 

This patch adds new ethtool cmd, ETHTOOL_GTUNABLE & ETHTOOL_STUNABLE for getting
tunable values from driver.

Add get_tunable and set_tunable to ethtool_ops. Driver implements these
functions for getting/setting tunable value.

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Govindarajulu Varadarajan 2014-09-03 03:17:20 +05:30 committed by David S. Miller
parent a03bb56e67
commit f0db9b0734
3 changed files with 113 additions and 0 deletions
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4
include/linux/ethtool.h
View File

@ -257,6 +257,10 @@ struct ethtool_ops {
struct ethtool_eeprom *, u8 *);
int (*get_eee)(struct net_device *, struct ethtool_eee *);
int (*set_eee)(struct net_device *, struct ethtool_eee *);
int (*get_tunable)(struct net_device *,
const struct ethtool_tunable *, void *);
int (*set_tunable)(struct net_device *,
const struct ethtool_tunable *, const void *);
};

28
include/uapi/linux/ethtool.h
View File

@ -209,6 +209,32 @@ struct ethtool_value {
__u32 data;
};
enum tunable_id {
ETHTOOL_ID_UNSPEC,
ETHTOOL_RX_COPYBREAK,
};
enum tunable_type_id {
ETHTOOL_TUNABLE_UNSPEC,
ETHTOOL_TUNABLE_U8,
ETHTOOL_TUNABLE_U16,
ETHTOOL_TUNABLE_U32,
ETHTOOL_TUNABLE_U64,
ETHTOOL_TUNABLE_STRING,
ETHTOOL_TUNABLE_S8,
ETHTOOL_TUNABLE_S16,
ETHTOOL_TUNABLE_S32,
ETHTOOL_TUNABLE_S64,
};
struct ethtool_tunable {
__u32 cmd;
__u32 id;
__u32 type_id;
__u32 len;
void *data[0];
};
/**
* struct ethtool_regs - hardware register dump
* @cmd: Command number = %ETHTOOL_GREGS
@ -1152,6 +1178,8 @@ enum ethtool_sfeatures_retval_bits {
#define ETHTOOL_GRSSH 0x00000046 /* Get RX flow hash configuration */
#define ETHTOOL_SRSSH 0x00000047 /* Set RX flow hash configuration */
#define ETHTOOL_GTUNABLE 0x00000048 /* Get tunable configuration */
#define ETHTOOL_STUNABLE 0x00000049 /* Set tunable configuration */
/* compatibility with older code */
#define SPARC_ETH_GSET ETHTOOL_GSET

81
net/core/ethtool.c
View File

@ -1621,6 +1621,80 @@ static int ethtool_get_module_eeprom(struct net_device *dev,
modinfo.eeprom_len);
}
static int ethtool_tunable_valid(const struct ethtool_tunable *tuna)
{
switch (tuna->id) {
case ETHTOOL_RX_COPYBREAK:
if (tuna->len != sizeof(u32) ||
tuna->type_id != ETHTOOL_TUNABLE_U32)
return -EINVAL;
break;
default:
return -EINVAL;
}
return 0;
}
static int ethtool_get_tunable(struct net_device *dev, void __user *useraddr)
{
int ret;
struct ethtool_tunable tuna;
const struct ethtool_ops *ops = dev->ethtool_ops;
void *data;
if (!ops->get_tunable)
return -EOPNOTSUPP;
if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
return -EFAULT;
ret = ethtool_tunable_valid(&tuna);
if (ret)
return ret;
data = kmalloc(tuna.len, GFP_USER);
if (!data)
return -ENOMEM;
ret = ops->get_tunable(dev, &tuna, data);
if (ret)
goto out;
useraddr += sizeof(tuna);
ret = -EFAULT;
if (copy_to_user(useraddr, data, tuna.len))
goto out;
ret = 0;
out:
kfree(data);
return ret;
}
static int ethtool_set_tunable(struct net_device *dev, void __user *useraddr)
{
int ret;
struct ethtool_tunable tuna;
const struct ethtool_ops *ops = dev->ethtool_ops;
void *data;
if (!ops->set_tunable)
return -EOPNOTSUPP;
if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
return -EFAULT;
ret = ethtool_tunable_valid(&tuna);
if (ret)
return ret;
data = kmalloc(tuna.len, GFP_USER);
if (!data)
return -ENOMEM;
useraddr += sizeof(tuna);
ret = -EFAULT;
if (copy_from_user(data, useraddr, tuna.len))
goto out;
ret = ops->set_tunable(dev, &tuna, data);
out:
kfree(data);
return ret;
}
/* The main entry point in this file. Called from net/core/dev_ioctl.c */
int dev_ethtool(struct net *net, struct ifreq *ifr)
@ -1670,6 +1744,7 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
case ETHTOOL_GCHANNELS:
case ETHTOOL_GET_TS_INFO:
case ETHTOOL_GEEE:
case ETHTOOL_GTUNABLE:
break;
default:
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
@ -1857,6 +1932,12 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
case ETHTOOL_GMODULEEEPROM:
rc = ethtool_get_module_eeprom(dev, useraddr);
break;
case ETHTOOL_GTUNABLE:
rc = ethtool_get_tunable(dev, useraddr);
break;
case ETHTOOL_STUNABLE:
rc = ethtool_set_tunable(dev, useraddr);
break;
default:
rc = -EOPNOTSUPP;
}