Explain more the expected flow for this command.
Signed-off-by: Emmanuel Grumbach <[email protected]>
---
include/uapi/linux/nl80211-vnd-intel.h | 29 ++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/include/uapi/linux/nl80211-vnd-intel.h b/include/uapi/linux/nl80211-vnd-intel.h
index 0bf177b84fd9..4ed7d0b24512 100644
--- a/include/uapi/linux/nl80211-vnd-intel.h
+++ b/include/uapi/linux/nl80211-vnd-intel.h
@@ -13,6 +13,35 @@
* enum iwl_mvm_vendor_cmd - supported vendor commands
* @IWL_MVM_VENDOR_CMD_GET_CSME_CONN_INFO: reports CSME connection info.
* @IWL_MVM_VENDOR_CMD_HOST_GET_OWNERSHIP: asks for ownership on the device.
+ * This is useful when the CSME firmware owns the device and the kernel
+ * wants to use it. In case the CSME firmware has no connection active the
+ * kernel will manage on its own to get ownership of the device.
+ * When the CSME firmware has an active connection, the user space
+ * involvement is required. The kernel will assert the RFKILL signal with
+ * the "device not owned" reason so that nobody can touch the device. Then
+ * the user space can run the following flow to be able to get connected
+ * to the very same AP the CSME firmware is currently connected to:
+ *
+ * 1) The user space (NetworkManager) boots and sees that the device is
+ * in RFKILL because the host doesn't own the device
+ * 2) The user space asks the kernel what AP the CSME firmware is
+ * connected to (with %IWL_MVM_VENDOR_CMD_GET_CSME_CONN_INFO)
+ * 3) The user space checks if it has a profile that matches the reply
+ * from the CSME firmware
+ * 4) The user space installs a network to the wpa_supplicant with a
+ * specific BSSID and a specific frequency
+ * 5) The user space prevents any type of full scan
+ * 6) The user space asks iwlmei to request ownership on the device (with
+ * this command)
+ * 7) iwlmei requests ownership from the CSME firmware
+ * 8) The CSME firmware grants ownership
+ * 9) iwlmei tells iwlwifi to lift the RFKILL
+ * 10) RFKILL OFF is reported to user space
+ * 11) The host boots the device, loads the firwmare, and connects to a
+ * specific BSSID without scanning including IP as fast as it can
+ * 12) The host reports to the CSME firmware that there is a connection
+ * 13) The TCP connection is preserved and the host has connectivity
+ *
* @IWL_MVM_VENDOR_CMD_ROAMING_FORBIDDEN_EVENT: notifies if roaming is allowed.
* It contains a &IWL_MVM_VENDOR_ATTR_ROAMING_FORBIDDEN and a
* &IWL_MVM_VENDOR_ATTR_VIF_ADDR attributes.
--
2.25.1