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authorDmitry Eremin-Solenikov <dbaryshkov@gmail.com>2009-08-19 14:53:39 (GMT)
committerDmitry Eremin-Solenikov <dbaryshkov@gmail.com>2009-08-19 19:08:19 (GMT)
commita0aea57786fe9c6b62b1a4f28409582520fa494f (patch)
tree5170efad00b83199cb0ef41edfe2983413359cb7 /Documentation/networking
parent3a5209e3b26386fd174820ee6e8e27479b24869a (diff)
ieee802154: document the skb->cb usage clearly.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/ieee802154.txt9
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/.
+

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