On Thu, 2019-08-01 at 12:51 -0400, David Miller wrote:

From: Hangbin Liu <redacted>
Date: Thu,  1 Aug 2019 17:03:47 +0800

quoted

When setting lots of multicast list on ibmveth, e.g. add 3000 membership on a
multicast group, the following error message flushes our log file

8507    [  901.478251] ibmveth 30000003 env3: h_multicast_ctrl rc=4 when adding an entry to the filter table
...
1718386 [ 5636.808658] ibmveth 30000003 env3: h_multicast_ctrl rc=4 when adding an entry to the filter table

We got 1.5 million lines of messages in 1.3h. Let's replace netdev_err() by
net_err_ratelimited() to avoid this issue. I don't use netdev_err_once() in
case h_multicast_ctrl() return different lpar_rc types.

Signed-off-by: Hangbin Liu <redacted>

Let's work on fixing what causes this problem, or adding a retry
mechanism, rather than making the message less painful.

What is worse is that these failures are not in any way communicated
back up the callchain to show that the operation didn't complete
sucessfully.

This is a real mess in behavior and error handling, don't make it
worse please.

That looks as though it could be quite a chore.

$ git grep -P '\bndo_set_rx_mode\s*=' | wc -l
326