On 8/21/2015 7:34 PM, Jason Gunthorpe wrote:
> 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 <[email protected]>
> ---
> drivers/infiniband/ulp/ipoib/ipoib_multicast.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
> b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
> index c0e702c577d5..2d43ec542b63 100644
> --- 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;
Aren't there other reasons that send only join might have EINVAL
indicated ? Maybe it's better to be overly silent rather than overly
verbose as to not spam the log but it seems like it would make debug of
such cases harder.
> +
> + 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);
ipoib_dbg_mcast logging is conditionalized on CONFIG_INFINIBAND_IPOIB_DEBUG
> @@ -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) &&
--
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