Commit b333b7e6 authored Nov 29, 2012 by Alan Ott Committed by David S. Miller Nov 30, 2012

6lowpan: consider checksum bytes in fragmentation threshold



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>

parent fed2c6fd

net/ieee802154/6lowpan.c

+2 −1

Original line number	Original line	Diff line number	Diff line
	@@ -1047,7 +1047,8 @@ static netdev_tx_t lowpan_xmit(struct sk_buff skb, struct net_device dev)
	goto error;		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);		err = dev_queue_xmit(skb);
	goto out;		goto out;
	}		}