firewire: net: really fix maximum possible MTU

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: 5d48f00('firewire: net: fix maximum possible MTU')
Signed-off-by: Stefan Richter <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

drivers/firewire/net.c

@@ -1465,7 +1465,7 @@ static int fwnet_probe(struct fw_unit *unit,
 
  net->mtu = 1500U;
  net->min_mtu = ETH_MIN_MTU;
- net->max_mtu = ETH_MAX_MTU;
+ net->max_mtu = 0xfff;
 
  /* Set our hardware address while we're at it */
  ha = (union fwnet_hwaddr *)net->dev_addr;