1. WL-124_GNU-GPL.zip Driver
2. driver.txt File Contents

driver.txt Driver File Contents (WL-124_GNU-GPL.zip)

Documents about softnet driver issues in general can be found
at:

	http://www.firstfloor.org/~andi/softnet/

Transmit path guidelines:

1) The hard_start_xmit method must never return '1' under any
   normal circumstances.  It is considered a hard error unless
   there is no way your device can tell ahead of time when it's
   transmit function will become busy.

   Instead it must maintain the queue properly.  For example,
   for a driver implementing scatter-gather this means:

	static int drv_hard_start_xmit(struct sk_buff *skb,
		   		       struct net_device *dev)
	{
		struct drv *dp = dev->priv;

		lock_tx(dp);
		...
		/* This is a hard error log it. */
		if (TX_BUFFS_AVAIL(dp) <= (skb_shinfo(skb)->nr_frags + 1)) {
			netif_stop_queue(dev);
			unlock_tx(dp);
			printk(KERN_ERR PFX "%s: BUG! Tx Ring full when queue awake!\n",
			       dev->name);
			return 1;
		}

		... queue packet to card ...
		... update tx consumer index ...

		if (TX_BUFFS_AVAIL(dp) <= (MAX_SKB_FRAGS + 1))
			netif_stop_queue(dev);

		...
		unlock_tx(dp);
		...
	}

   And then at the end of your TX reclaimation event handling:

	if (netif_queue_stopped(dp->dev) &&
            TX_BUFFS_AVAIL(dp) > (MAX_SKB_FRAGS + 1))
		netif_wake_queue(dp->dev);

   For a non-scatter-gather supporting card, the three tests simply become:

		/* This is a hard error log it. */
		if (TX_BUFFS_AVAIL(dp) <= 0)

   and:

		if (TX_BUFFS_AVAIL(dp) == 0)

   and:

	if (netif_queue_stopped(dp->dev) &&
            TX_BUFFS_AVAIL(dp) > 0)
		netif_wake_queue(dp->dev);

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

   For example, this means that it is not allowed for your TX
   mitigation scheme to let TX packets "hang out" in the TX
   ring unreclaimed forever if no new TX packets are sent.
   This error can deadlock sockets waiting for send buffer room
   to be freed up.

   If you return 1 from the hard_start_xmit method, you must not keep
   any reference to that SKB and you must not attempt to free it up.

Probing guidelines:

1) Any hardware layer address you obtain for your device should
   be verified.  For example, for ethernet check it with
   linux/etherdevice.h:is_valid_ether_addr()

How To Update Drivers Manually

After your driver has been downloaded, follow these simple steps to install it.

• Expand the archive file (if the download file is in zip or rar format).

• If the expanded file has an .exe extension, double click it and follow the installation instructions.

• Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.

• Find the device and model you want to update in the device list.

• Double-click on it to open the Properties dialog box.

• From the Properties dialog box, select the Driver tab.

• Click the Update Driver button, then follow the instructions.

Very important: You must reboot your system to ensure that any driver updates have taken effect.

For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.