2012-11-30 01:55:45

by Alan Ott

Subject: [PATCH] 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 <[email protected]>
---
net/ieee802154/6lowpan.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 6d42c17..f651da6 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -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;
}
--
1.7.11.2

2012-11-30 01:58:38

by Alan Ott

Subject: Re: [PATCH] 6lowpan: consider checksum bytes in fragmentation threshold

On 11/29/2012 08:55 PM, Alan Ott wrote:
> 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.
>

Sorry, this was put in the wrong thread. One day I'll get one of these
first-try. :(

2012-11-30 17:19:40

by David Miller

Subject: Re: [PATCH] 6lowpan: consider checksum bytes in fragmentation threshold

From: Alan Ott <[email protected]>
Date: Thu, 29 Nov 2012 20:55:44 -0500

> 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 <[email protected]>

Applied.