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Date:   Sat, 29 Oct 2016 23:01:04 -0400 (EDT)
From:   David Miller <>
Subject: Re: [PATCH net-next] firewire: net: really fix maximum possible MTU

From: Stefan Richter <>
Date: Sat, 29 Oct 2016 22:16:58 +0200

> The maximum unicast datagram size /without/ link fragmentation is
> 4096 - 4 = 4092 (max IEEE 1394 async payload size at >= S800 bus speed,
> minus unfragmented encapssulation header).  Max broadcast datagram size
> without fragmentation is 8 bytes less than that (due to GASP header).
> The maximum datagram size /with/ link fragmentation is 0xfff = 4095
> for unicast and broadcast.  This is because the RFC 2734 fragment
> encapsulation header field for datagram size is only 12 bits wide.
> Fixes: 5d48f00d836a('firewire: net: fix maximum possible MTU')
> Signed-off-by: Stefan Richter <>

Applied, thanks.

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