netdev - [PATCH 1/5] ieee802154: document the skb->cb usage clearly.

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Message-Id: <1250784787-30590-2-git-send-email-dbaryshkov@gmail.com>
Date:	Thu, 20 Aug 2009 20:13:03 +0400
From:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-zigbee-devel@...ts.sourceforge.net,
	Sergey Lapin <slapin@...fans.org>
Subject: [PATCH 1/5] ieee802154: document the skb->cb usage clearly.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
---
 Documentation/networking/ieee802154.txt |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/Documentation/networking/ieee802154.txt b/Documentation/networking/ieee802154.txt
index 1c0c82c..23c995e 100644
--- a/Documentation/networking/ieee802154.txt
+++ b/Documentation/networking/ieee802154.txt
@@ -56,8 +56,12 @@ HardMAC
 
 See the header include/net/ieee802154_netdev.h. You have to implement Linux
 net_device, with .type = ARPHRD_IEEE802154. Data is exchanged with socket family
-code via plain sk_buffs. The control block of sk_buffs will contain additional
-info as described in the struct ieee802154_mac_cb.
+code via plain sk_buffs. On skb reception skb->cb must contain additional
+info as described in the struct ieee802154_mac_cb. During packet transmission
+the skb->cb is used to provide additional data to device's header_ops->create
+function. Be aware, that this data can be overriden later (when socket code
+submits skb to qdisc), so if you need something from that cb later, you should
+store info in the skb->data on your own.
 
 To hook the MLME interface you have to populate the ml_priv field of your
 net_device with a pointer to struct ieee802154_mlme_ops instance. All fields are
@@ -73,3 +77,4 @@ We are going to provide intermediate layer implementing IEEE 802.15.4 MAC
 in software. This is currently WIP.
 
 See header include/net/mac802154.h and several drivers in drivers/ieee802154/.
+
-- 
1.6.3.3

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