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@signal11.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mac802154/wpan.c b/net/mac802154/wpan.c
index 7d3f659..2ca2f4d 100644 (file)
--- 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;