[RFC v2 3/5] rtnetlink: add IFLA_PARENT_DEV_NAME
From: Johannes Berg <johannes@sipsolutions.net>
Date: 2021-06-02 08:29:00
Also in:
netdev
Subsystem:
networking drivers, networking [general], the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Johannes Berg <redacted> 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@gmail.com> Signed-off-by: Johannes Berg <redacted> --- 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