netdev - [PATCH net-next 03/15] 6lowpan: always enable link-layer acknowledgments

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Date:	Tue, 23 Oct 2012 00:09:45 -0400
From:	Tony Cheneau <tony.cheneau@...esiak.org>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-zigbee-devel@...ts.sourceforge.net,
	Alan Ott <alan@...nal11.us>,
	Alexander Smirnov <alex.bluesman.smirnov@...il.com>
Subject: [PATCH net-next 03/15] 6lowpan: always enable link-layer acknowledgments

This feature is especially important when using fragmentation, because
the reassembly mechanism can not recover from the loss of a fragment.

Note that some hardware ignore this flag and not will not transmit any
acknowledgments if this is set.

Signed-off-by: Tony Cheneau <tony.cheneau@...esiak.org>
---
 net/ieee802154/6lowpan.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index b53a71a4..49d91df 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -589,6 +589,10 @@ static int lowpan_header_create(struct sk_buff *skb,
 
 		mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
 
+		/* request acknowledgment when possible */
+		if (!lowpan_is_addr_broadcast(daddr))
+			mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
+
 		return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
 				type, (void *)&da, (void *)&sa, skb->len);
 	}
-- 
1.7.8.6

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