netdev - Re: bnx2x multicast packet loss on igmp join/leave

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Date:	Fri, 5 Apr 2013 15:28:01 +0300
From:	Dmitry Kravkov <dkravkov@...il.com>
To:	vincent Richard <vincent.richard449@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: bnx2x multicast packet loss on igmp join/leave

On Fri, Apr 5, 2013 at 1:13 PM, vincent Richard
<vincent.richard449@...il.com> wrote:
>
> 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

This because on MC group change, bnx2x first removes the devices from
ALL MC groups and then
add the device to newly configured groups:

11112        /* first, clear all configured multicast MACs */
11113        rc = bnx2x_config_mcast(bp, &rparam, BNX2X_MCAST_CMD_DEL);
11114        if (rc < 0) {
11115                BNX2X_ERR("Failed to clear multicast
configuration: %d\n", rc);
11116                return rc;
11117        }
11118
11119        /* then, configure a new MACs list */
11120        if (netdev_mc_count(dev)) {
11121               rc = bnx2x_init_mcast_macs_list(bp, &rparam);
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