netlink: introduce the netlink interface
Initial part of netlink interface based on genetlink and libmnl. The
netlink interface is available in kernel since 5.6-rc1. This commit only
adds the generic infrastructure but does not override any ethtool command
so that there is no actual change in behaviour.
Netlink handlers for ethtool commands are added as nlfunc members to args
array in ethtool.c. A netlink handler is used if it is available (i.e.
nlfunc is not null) and ethtool succeeds to initialize netlink socket.
If netlink implementation exists for a command but the request is not
supported by kernel (e.g. when new ethtool is used on older kernel), ioctl
implementation is also used as fallback.
Running configure with --disable-netlink completely disables the netlink
interface.
v2:
- change type of nl_context::suppress_nlerr
- add nl_context::rtnl_socket
v3:
- drop ethtool_CFLAGS and ethtool_LDADD in Makefile.am
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
7 files changed
