rt2x00: Add TX/RX frame dumping facility

This adds TX/RX frame dumping capabilities through debugfs.
The intention is that with this approach debugging of rt2x00 is
simplified since _all_ frames going in and out of the device
are send to debugfs as well along with additional information
like the hardware descriptor.

Based on the patch by Mattias Nissler.
Mattias also has some tools that will make the dumped frames
available to wireshark: http://www-user.rhrk.uni-kl.de/~nissler/rt2x00/

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 31e48c25a69..ba874cff864 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -623,7 +623,7 @@ struct rt2x00_dev {
          * required for deregistration of debugfs.
          */
 #ifdef CONFIG_RT2X00_LIB_DEBUGFS
-        const struct rt2x00debug_intf *debugfs_intf;
+        struct rt2x00debug_intf *debugfs_intf;
 #endif /* CONFIG_RT2X00_LIB_DEBUGFS */
 
         /*
@@ -791,6 +791,12 @@ struct rt2x00_dev {
         ring_loop(__entry, (__dev)->tx, ring_end(__dev))
 
 /*
+ * Compute an array index from a pointer to an element and the base pointer.
+ */
+#define ARRAY_INDEX(__elem, __base) \
+        ( ((char *)(__elem) - (char *)(__base)) / sizeof(*(__elem)) )
+
+/*
  * Generic RF access.
  * The RF is being accessed by word index.
  */