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6lowpan: consider checksum bytes in fragmentation threshold

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Change the threshold for framentation of a lowpan packet from
using the MTU size to now use the MTU size minus the checksum length,
which is added by the hardware. For IEEE 802.15.4, this effectively
changes it from 127 bytes to 125 bytes.

Signed-off-by: Alan Ott <alan@signal11.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alan Ott 2012-11-29 15:55:44 +00:00 committed by David S. Miller
parent fed2c6fd1f
commit b333b7e6ec
1 changed files with 2 additions and 1 deletions
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3
net/ieee802154/6lowpan.c
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@ -1047,7 +1047,8 @@ static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
goto error;
}
if (skb->len <= IEEE802154_MTU) {
/* Send directly if less than the MTU minus the 2 checksum bytes. */
if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) {
err = dev_queue_xmit(skb);
goto out;
}