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)
        {
        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);
                ...
 
                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.
 
 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.
 
    method, it is your driver's responsibility to free up the SKB
    and in some finite amount of time.