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netdev: Allow get_ifindex and get_features to be null.

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Allow netdev providers to set get_ifindex and get_features it
null if they would always return EOPNOTSUPP.  This is particuarly
useful for virtual devices.
This commit is contained in:
Jesse Gross
2010-04-11 09:37:19 -04:00
parent 658797c83a
commit 4c0f178060
2 changed files with 28 additions and 6 deletions
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24
lib/netdev.c
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@@ -629,23 +629,37 @@ netdev_get_mtu(const struct netdev *netdev, int *mtup)
* value should be unique within a host and remain stable at least until
* reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
* but many systems do not follow this rule anyhow.
*
* Some network devices may not implement support for this function. In such
* cases this function will always return -EOPNOTSUPP.
*/
int
netdev_get_ifindex(const struct netdev *netdev)
{
return netdev_get_dev(netdev)->netdev_class->get_ifindex(netdev);
int (*get_ifindex)(const struct netdev *);
get_ifindex = netdev_get_dev(netdev)->netdev_class->get_ifindex;
return get_ifindex ? get_ifindex(netdev) : -EOPNOTSUPP;
}
/* Stores the features supported by 'netdev' into each of '*current',
* '*advertised', '*supported', and '*peer' that are non-null. Each value is a
* bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
* successful, otherwise a positive errno value. On failure, all of the
* passed-in values are set to 0. */
* passed-in values are set to 0.
*
* Some network devices may not implement support for this function. In such
* cases this function will always return EOPNOTSUPP.
*/
int
netdev_get_features(struct netdev *netdev,
uint32_t *current, uint32_t *advertised,
uint32_t *supported, uint32_t *peer)
{
int (*get_features)(struct netdev *netdev,
uint32_t *current, uint32_t *advertised,
uint32_t *supported, uint32_t *peer);
uint32_t dummy[4];
int error;
@@ -662,8 +676,10 @@ netdev_get_features(struct netdev *netdev,
peer = &dummy[3];
}
error = netdev_get_dev(netdev)->netdev_class->get_features(netdev, current,
advertised, supported, peer);
get_features = netdev_get_dev(netdev)->netdev_class->get_features;
error = get_features
? get_features(netdev, current, advertised, supported, peer)
: EOPNOTSUPP;
if (error) {
*current = *advertised = *supported = *peer = 0;
}