netdev - bnx2x multicast packet loss on igmp join/leave

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Message-ID: <CABVbdp_R7H5tWfFUF_8c=4GWLC80Vr8SajZskc8C51Hduue49Q@mail.gmail.com>
Date:	Fri, 5 Apr 2013 12:13:48 +0200
From:	vincent Richard <vincent.richard449@...il.com>
To:	netdev@...r.kernel.org
Subject: bnx2x multicast packet loss on igmp join/leave

I all,

I am using a HP server with bnx2x ethernet cards in it.
I have compiled the latest linux 3.2 version, and I am encountering
the following error :

when joining or leaving a multicast group, other multicast streams
lose some packets.

I tried latest firmware and different drivers (latest HP recommended
one (redhat one)) but still the same..

I observe that putting the interface in promiscuous mode make the
problem disappear.

looking around bnx2x_set_rx_mode, i notice that there is 3 rx_mode,
NORMAL, PROMISCUOUS and ALLMULTI . forcing other than normal mode
correct my issue..

My bnx2x is in a blade center so there is a switch just after. So
forcing PROMISCUOUS or ALLMULTI mode have no major impact.

To reproduce the problem I just "listen" 2 multicast streams and
join/leave another one periodically.

Thanks in advance for your help.
Regards,
Vincent
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