[PATCH] nl80211: vendor-cmd: intel: add more details for IWL_MVM_VENDOR_CMD_HOST_GET_OWNERSHIP
From: Emmanuel Grumbach <hidden>
Date: 2021-10-20 05:12:00
Subsystem:
the rest · Maintainer:
Linus Torvalds
Explain more the expected flow for this command. Signed-off-by: Emmanuel Grumbach <redacted> --- 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.
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2.25.1