IB/ipoib: Suppress warning for send only join failures

We expect send only joins to fail, it just means there are no listeners
for the group. The correct thing to do is silently drop the packet
at source.

Eg avahi will full join 224.0.0.251 which causes a send only IGMP packet
to 224.0.0.22, and then a warning level kmessage like this:

 ib0: sendonly multicast join failed for ff12:401b:ffff:0000:0000:0000:0000:0016, status -22

If there is no IP router listening to IGMP.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index 5e2db3b7c8bb1fc57e4402e1d05720f539395a68..09a1748f9d131423f020020456d61d2f6c44a8b1 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -393,8 +393,13 @@ static int ipoib_mcast_join_complete(int status,
                        goto out_locked;
                }
        } else {
-               if (mcast->logcount++ < 20) {
-                       if (status == -ETIMEDOUT || status == -EAGAIN) {
+               bool silent_fail =
+                   test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
+                   status == -EINVAL;
+
+               if (mcast->logcount < 20) {
+                       if (status == -ETIMEDOUT || status == -EAGAIN ||
+                           silent_fail) {
                                ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n",
                                                test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
                                                mcast->mcmember.mgid.raw, status);
@@ -403,6 +408,9 @@ static int ipoib_mcast_join_complete(int status,
                                                test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
                                           mcast->mcmember.mgid.raw, status);
                        }
+
+                       if (!silent_fail)
+                               mcast->logcount++;
                }
 
                if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&