linux-kernel - [PATCH v2 3/4] mac802154: Increase tx_buffer

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Date:	Wed,  3 Apr 2013 10:00:57 -0400
From:	Alan Ott <alan@...nal11.us>
To:	Alexander Smirnov <alex.bluesman.smirnov@...il.com>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Cc:	linux-zigbee-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Alan Ott <alan@...nal11.us>
Subject: [PATCH v2 3/4] mac802154: Increase tx_buffer_len

Increase the buffer length from 10 to 300 packets. Consider that traffic on
mac802154 devices will often be 6LoWPAN, and a full-length (1280 octet)
IPv6 packet will fragment into 15 6LoWPAN fragments (because the MTU of
IEEE 802.15.4 is 127).  A 300-packet queue is really 20 full-length IPv6
packets.

With a queue length of 10, an entire IPv6 packet was unable to get queued
at one time, causing fragments to be dropped, and making reassembly
impossible.

Signed-off-by: Alan Ott <alan@...nal11.us>
---
 net/mac802154/wpan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac802154/wpan.c b/net/mac802154/wpan.c
index 7d3f659..2ca2f4d 100644
--- a/net/mac802154/wpan.c
+++ b/net/mac802154/wpan.c
@@ -360,7 +360,7 @@ void mac802154_wpan_setup(struct net_device *dev)
 	dev->header_ops		= &mac802154_header_ops;
 	dev->needed_tailroom	= 2; /* FCS */
 	dev->mtu		= IEEE802154_MTU;
-	dev->tx_queue_len	= 10;
+	dev->tx_queue_len	= 300;
 	dev->type		= ARPHRD_IEEE802154;
 	dev->flags		= IFF_NOARP | IFF_BROADCAST;
 	dev->watchdog_timeo	= 0;
-- 
1.7.11.2

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