Tue, Mar 26, 2019 at 07:17:20PM CET, mkubecek@suse.cz wrote:

On Tue, Mar 26, 2019 at 05:34:00PM +0100, Jiri Pirko wrote:

quoted

Mon, Mar 25, 2019 at 06:08:18PM CET, mkubecek@suse.cz wrote:

quoted

+void ethtool_notify(struct net_device *dev, struct netlink_ext_ack *extack,
+		    unsigned int cmd, u32 req_mask, const void *data)
+{
+	if (unlikely(!ethnl_ok))

Why do you need this?

If genetlink family registration fails, ethtool_notify() can be still
called from other code (e.g. the ethtool ioctl interface). In such case,
better bail out right away than fail somewhere later (probably after
preparing the message which can't be sent anyway).

Again, haven't seen this in any other gen netlink implementation. Why do
they not need it?

quoted

quoted

+		return;
+	ASSERT_RTNL();
+
+	if (likely(cmd < ARRAY_SIZE(ethnl_notify_handlers) &&
+		   ethnl_notify_handlers[cmd]))
+		ethnl_notify_handlers[cmd](dev, extack, cmd, req_mask, data);
+	else
+		WARN_ONCE(1, "notification %u not implemented (dev=%s, req_mask=0x%x)\n",
+			  cmd, netdev_name(dev), req_mask);
+}
+EXPORT_SYMBOL(ethtool_notify);

Please be consistent with prefixes. Rest of the code (most of it) has
prefix "ethnl".

The reason why I used ethtool_ prefix here was that this function is an
entry point which can be called from anywhere and other code doesn't
care if we are using netlink or something else. But as any caller would
need to include <linux/ethtool_netlink.h> anyway to get the constants
for cmd and req_mask, there is no point hiding the fact. I'll rename it
to ethnl_notify().

Okay.

quoted

quoted

diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index b8a6cd3dc3e3..5f2299548915 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h

@@ -11,6 +11,8 @@

#define ETHNL_SET_ERRMSG(info, msg) \
	do { if (info) GENL_SET_ERR_MSG(info, msg); } while (0)

+extern u32 ethnl_bcast_seq;

Why do you need to have this in header? Second, it is not used by
anything. Please don't introduce variables that are not used. Introduce
them only in patch where you use it.

It's the same as with ethtool_genl_family. I'll make it static as well
until it's used in some other file.

Not only static. You should remove it as you are not using it in this
patch at all.

Michal