From: Johannes Berg <johannes.berg@xxxxxxxxx>
In some cases, for example in the upcoming WWAN framework
changes, there's no natural "parent netdev", so sometimes
dummy netdevs are created or similar. IFLA_PARENT_DEV_NAME
is a new attribute intended to contain a device (sysfs,
struct device) name that can be used instead when creating
a new netdev, if the rtnetlink family implements it.
Suggested-by: Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
v2:
* new patch
---
include/uapi/linux/if_link.h | 6 ++++++
net/core/rtnetlink.c | 1 +
2 files changed, 7 insertions(+)
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index f7c3beebb074..3455780193a4 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -341,6 +341,12 @@ enum {
IFLA_ALT_IFNAME, /* Alternative ifname */
IFLA_PERM_ADDRESS,
IFLA_PROTO_DOWN_REASON,
+
+ /* device (sysfs) name as parent, used instead
+ * of IFLA_LINK where there's no parent netdev
+ */
+ IFLA_PARENT_DEV_NAME,
+
__IFLA_MAX
};
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 4975dd91407d..49a27bf6e4a7 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1878,6 +1878,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_PERM_ADDRESS] = { .type = NLA_REJECT },
[IFLA_PROTO_DOWN_REASON] = { .type = NLA_NESTED },
[IFLA_NEW_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 1),
+ [IFLA_PARENT_DEV_NAME] = { .type = NLA_NUL_STRING },
};
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
--
2.31.1
