Add a document describing the padata interface

[pandora-kernel.git] / Documentation / networking / driver.txt

diff --git a/Documentation/networking/driver.txt b/Documentation/networking/driver.txt
index 4f7da5a..03283da 100644 (file)
--- a/Documentation/networking/driver.txt
+++ b/Documentation/networking/driver.txt
@@ -13,7 +13,7 @@ Transmit path guidelines:
        static int drv_hard_start_xmit(struct sk_buff *skb,
                                       struct net_device *dev)
        {
-               struct drv *dp = dev->priv;
+               struct drv *dp = netdev_priv(dev);
 
                lock_tx(dp);
                ...
@@ -61,7 +61,10 @@ Transmit path guidelines:
 2) Do not forget to update netdev->trans_start to jiffies after
    each new tx packet is given to the hardware.
 
-3) Do not forget that once you return 0 from your hard_start_xmit
+3) A hard_start_xmit method must not modify the shared parts of a
+   cloned SKB.
+
+4) Do not forget that once you return 0 from your hard_start_xmit
    method, it is your driver's responsibility to free up the SKB
    and in some finite amount of time.