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firewire: net: max MTU off by one

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The latest max_mtu patch missed that datagram_size is actually one less
than the datagram's Total Length.

Fixes: 357f4aae85 ("firewire: net: really fix maximum possible MTU")
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2016-11-02 21:09:44 +01:00
parent bebc6082da
commit 4adf7bf7bb
1 changed files with 6 additions and 1 deletions
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7
drivers/firewire/net.c
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@ -1480,9 +1480,14 @@ static int fwnet_probe(struct fw_unit *unit,
goto out;
dev->local_fifo = dev->handler.offset;
/*
* default MTU: RFC 2734 cl. 4, RFC 3146 cl. 4
* maximum MTU: RFC 2734 cl. 4.2, fragment encapsulation header's
* maximum possible datagram_size + 1 = 0xfff + 1
*/
net->mtu = 1500U;
net->min_mtu = ETH_MIN_MTU;
net->max_mtu = 0xfff;
net->max_mtu = 4096U;
/* Set our hardware address while we're at it */
ha = (union fwnet_hwaddr *)net->dev_addr;