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netdev-linux: Introduce netdev_linux_ethtool_set_flag().

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There will be a caller added soon.
This commit is contained in:
Justin Pettit
2011-08-17 14:38:08 -07:00
parent 56717eb17c
commit e47bd51a7b
2 changed files with 61 additions and 0 deletions
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54
lib/netdev-linux.c
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@@ -90,6 +90,15 @@ COVERAGE_DEFINE(netdev_ethtool);
#define ADVERTISED_Asym_Pause (1 << 14)
#endif
/* These were introduced in Linux 2.6.24, so they might be missing if we
* have old headers. */
#ifndef ETHTOOL_GFLAGS
#define ETHTOOL_GFLAGS 0x00000025 /* Get flags bitmap(ethtool_value) */
#endif
#ifndef ETHTOOL_SFLAGS
#define ETHTOOL_SFLAGS 0x00000026 /* Set flags bitmap(ethtool_value) */
#endif
/* This was introduced in Linux 2.6.25, so it might be missing if we have old
* headers. */
#ifndef TC_RTAB_SIZE
@@ -4210,6 +4219,51 @@ netdev_linux_do_ethtool(const char *name, struct ethtool_cmd *ecmd,
}
}
/* Modifies the 'flag' bit in ethtool's flags field for 'netdev'. If
* 'enable' is true, the bit is set. Otherwise, it is cleared. */
int
netdev_linux_ethtool_set_flag(struct netdev *netdev, uint32_t flag,
const char *flag_name, bool enable)
{
const char *netdev_name = netdev_get_name(netdev);
struct ethtool_value evalue;
uint32_t new_flags;
int error;
memset(&evalue, 0, sizeof evalue);
error = netdev_linux_do_ethtool(netdev_name,
(struct ethtool_cmd *)&evalue,
ETHTOOL_GFLAGS, "ETHTOOL_GFLAGS");
if (error) {
return error;
}
evalue.data = new_flags = (evalue.data & ~flag) | (enable ? flag : 0);
error = netdev_linux_do_ethtool(netdev_name,
(struct ethtool_cmd *)&evalue,
ETHTOOL_SFLAGS, "ETHTOOL_SFLAGS");
if (error) {
return error;
}
memset(&evalue, 0, sizeof evalue);
error = netdev_linux_do_ethtool(netdev_name,
(struct ethtool_cmd *)&evalue,
ETHTOOL_GFLAGS, "ETHTOOL_GFLAGS");
if (error) {
return error;
}
if (new_flags != evalue.data) {
VLOG_WARN_RL(&rl, "attempt to %s ethtool %s flag on network "
"device %s failed", enable ? "enable" : "disable",
flag_name, netdev_name);
return EOPNOTSUPP;
}
return 0;
}
static int
netdev_linux_do_ioctl(const char *name, struct ifreq *ifr, int cmd,
const char *cmd_name)