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-rw-r--r--include/linux/usb/cdc.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/usb/cdc.h b/include/linux/usb/cdc.h
index 2967284..c1d039c 100644
--- a/include/linux/usb/cdc.h
+++ b/include/linux/usb/cdc.h
@@ -158,6 +158,9 @@ struct usb_cdc_mdlm_detail_desc {
*
* section 3.6.2.1 table 4 has the ACM profile, for modems.
* section 3.8.2 table 10 has the ethernet profile.
+ *
+ * Microsoft's RNDIS stack for Ethernet is a vendor-specific CDC ACM variant,
+ * heavily dependent on the encapsulated (proprietary) command mechanism.
*/
#define USB_CDC_SEND_ENCAPSULATED_COMMAND 0x00
@@ -203,7 +206,8 @@ struct usb_cdc_line_coding {
* Class-Specific Notifications (6.3) sent by interrupt transfers
*
* section 3.8.2 table 11 of the CDC spec lists Ethernet notifications
- * section 3.6.2.1 table 5 specifies ACM notifications
+ * section 3.6.2.1 table 5 specifies ACM notifications, accepted by RNDIS
+ * RNDIS also defines its own bit-incompatible notifications
*/
#define USB_CDC_NOTIFY_NETWORK_CONNECTION 0x00