netdev - Re: [net 1/1] tipc: accept PACKET

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Message-Id: <20170814.111942.369539648096109896.davem@davemloft.net>
Date:   Mon, 14 Aug 2017 11:19:42 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     jon.maloy@...csson.com
Cc:     netdev@...r.kernel.org, parthasarathy.bhuvaragan@...csson.com,
        ying.xue@...driver.com, tipc-discussion@...ts.sourceforge.net
Subject: Re: [net 1/1] tipc: accept PACKET_MULTICAST packets

From: Jon Maloy <jon.maloy@...csson.com>
Date: Mon, 14 Aug 2017 17:55:56 +0200

> On L2 bearers, the TIPC broadcast function is sending out packets using
> the corresponding L2 broadcast address. At reception, we filter such
> packets under the assumption that they will also be delivered as
> broadcast packets.
> 
> This assumption doesn't always hold true. Under high load, we have seen
> that a switch may convert the destination address and deliver the packet
> as a PACKET_MULTICAST, something leading to inadvertently dropped
> packets and a stale and reset broadcast link.
> 
> We fix this by extending the reception filtering to accept packets of
> type PACKET_MULTICAST.
> 
> Signed-off-by: Jon Maloy <jon.maloy@...csson.com>

Applied, thanks Jon.