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authorDavid Brownell <david-b@pacbell.net>2006-04-02 10:19:08 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2006-04-14 11:12:24 -0700
commit51400f1d6ef7ca871b584117527f7c6b12bf182b (patch)
tree457e02d46cbf31227a6947c678a171066439b19c /drivers
parent68dcc688d1f042842a8fb523e4a584b3211181d1 (diff)
[PATCH] USB: rndis_host whitespace/comment updates
This adds a "avoid proprietary protocols" warnoff, identifying several of the known deficiencies in Microsoft's excuse-for-specification, and fixes some whitespace bugs. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/net/rndis_host.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/drivers/usb/net/rndis_host.c b/drivers/usb/net/rndis_host.c
index 49991ac1bf3..94ddfe16fdd 100644
--- a/drivers/usb/net/rndis_host.c
+++ b/drivers/usb/net/rndis_host.c
@@ -39,6 +39,20 @@
* RNDIS is NDIS remoted over USB. It's a MSFT variant of CDC ACM ... of
* course ACM was intended for modems, not Ethernet links! USB's standard
* for Ethernet links is "CDC Ethernet", which is significantly simpler.
+ *
+ * NOTE that Microsoft's "RNDIS 1.0" specification is incomplete. Issues
+ * include:
+ * - Power management in particular relies on information that's scattered
+ * through other documentation, and which is incomplete or incorrect even
+ * there.
+ * - There are various undocumented protocol requirements, such as the
+ * need to send unused garbage in control-OUT messages.
+ * - In some cases, MS-Windows will emit undocumented requests; this
+ * matters more to peripheral implementations than host ones.
+ *
+ * For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in
+ * favor of such non-proprietary alternatives as CDC Ethernet or the newer (and
+ * currently rare) "Ethernet Emulation Model" (EEM).
*/
/*
@@ -72,17 +86,17 @@ struct rndis_msg_hdr {
*/
#define RNDIS_MSG_PACKET ccpu2(0x00000001) /* 1-N packets */
#define RNDIS_MSG_INIT ccpu2(0x00000002)
-#define RNDIS_MSG_INIT_C (RNDIS_MSG_INIT|RNDIS_MSG_COMPLETION)
+#define RNDIS_MSG_INIT_C (RNDIS_MSG_INIT|RNDIS_MSG_COMPLETION)
#define RNDIS_MSG_HALT ccpu2(0x00000003)
#define RNDIS_MSG_QUERY ccpu2(0x00000004)
-#define RNDIS_MSG_QUERY_C (RNDIS_MSG_QUERY|RNDIS_MSG_COMPLETION)
+#define RNDIS_MSG_QUERY_C (RNDIS_MSG_QUERY|RNDIS_MSG_COMPLETION)
#define RNDIS_MSG_SET ccpu2(0x00000005)
-#define RNDIS_MSG_SET_C (RNDIS_MSG_SET|RNDIS_MSG_COMPLETION)
+#define RNDIS_MSG_SET_C (RNDIS_MSG_SET|RNDIS_MSG_COMPLETION)
#define RNDIS_MSG_RESET ccpu2(0x00000006)
-#define RNDIS_MSG_RESET_C (RNDIS_MSG_RESET|RNDIS_MSG_COMPLETION)
+#define RNDIS_MSG_RESET_C (RNDIS_MSG_RESET|RNDIS_MSG_COMPLETION)
#define RNDIS_MSG_INDICATE ccpu2(0x00000007)
#define RNDIS_MSG_KEEPALIVE ccpu2(0x00000008)
-#define RNDIS_MSG_KEEPALIVE_C (RNDIS_MSG_KEEPALIVE|RNDIS_MSG_COMPLETION)
+#define RNDIS_MSG_KEEPALIVE_C (RNDIS_MSG_KEEPALIVE|RNDIS_MSG_COMPLETION)
/* codes for "status" field of completion messages */
#define RNDIS_STATUS_SUCCESS ccpu2(0x00000000)
@@ -596,13 +610,13 @@ static struct usb_driver rndis_driver = {
static int __init rndis_init(void)
{
- return usb_register(&rndis_driver);
+ return usb_register(&rndis_driver);
}
module_init(rndis_init);
static void __exit rndis_exit(void)
{
- usb_deregister(&rndis_driver);
+ usb_deregister(&rndis_driver);
}
module_exit(rndis_exit);