From: Dmitry Lebed <dlebed@xxxxxxxxxxxxx>
Add wiphy flag to indicate that HW does all DFS actions by itself.
User-space functionality already implemented in hostapd using
vendor-specific (QCA) OUI to advertise HW support.
Need to introduce generic flag to inform about DFS offload support.
For deivces with DFS_OFFLOAD flag set user-space will no longer
need to issue CAC or do any actions in response to
"radar detected" events. HW will do everything by itself and send
events to user-space to idicate that CAC was started/finished, etc.
Signed-off-by: Dmitrii Lebed <dlebed@xxxxxxxxxxxxx>
---
include/net/cfg80211.h | 7 ++++++-
include/uapi/linux/nl80211.h | 9 +++++++++
net/wireless/nl80211.c | 7 +++++++
3 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index ed3a28105d6c..b2d17993ae4d 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3241,6 +3241,11 @@ struct cfg80211_ops {
* @WIPHY_FLAG_IBSS_RSN: The device supports IBSS RSN.
* @WIPHY_FLAG_MESH_AUTH: The device supports mesh authentication by routing
* auth frames to userspace. See @NL80211_MESH_SETUP_USERSPACE_AUTH.
+ * @WIPHY_FLAG_DFS_OFFLOAD: Device will do all DFS-related actions by itself,
+ * informing user-space about CAC progress, radar detection event,
+ * channel change triggered by radar detection event.
+ * No need to start CAC from user-space, no need to react to
+ * "radar detected" event.
* @WIPHY_FLAG_SUPPORTS_FW_ROAM: The device supports roaming feature in the
* firmware.
* @WIPHY_FLAG_AP_UAPSD: The device supports uapsd on AP.
@@ -3275,7 +3280,7 @@ enum wiphy_flags {
WIPHY_FLAG_CONTROL_PORT_PROTOCOL = BIT(7),
WIPHY_FLAG_IBSS_RSN = BIT(8),
WIPHY_FLAG_MESH_AUTH = BIT(10),
- /* use hole at 11 */
+ WIPHY_FLAG_DFS_OFFLOAD = BIT(11),
/* use hole at 12 */
WIPHY_FLAG_SUPPORTS_FW_ROAM = BIT(13),
WIPHY_FLAG_AP_UAPSD = BIT(14),
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 22cca373161d..c53281397be6 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2156,6 +2156,13 @@ enum nl80211_commands {
* @NL80211_ATTR_PMKR0_NAME: PMK-R0 Name for offloaded FT.
* @NL80211_ATTR_PORT_AUTHORIZED: (reserved)
*
+ * @NL80211_ATTR_DFS_OFFLOAD: Indicates that the HW will offload DFS actions.
+ * Device will do all DFS-related actions by itself,
+ * informing user-space about CAC progress, radar detection event,
+ * channel change triggered by radar detection event.
+ * No need to start CAC from user-space, no need to react to
+ * "radar detected" event.
+ *
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
@@ -2582,6 +2589,8 @@ enum nl80211_attrs {
NL80211_ATTR_PMKR0_NAME,
NL80211_ATTR_PORT_AUTHORIZED,
+ NL80211_ATTR_DFS_OFFLOAD,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index b5e613d14d6a..635bf4143d03 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -1530,6 +1530,9 @@ static int nl80211_send_wiphy(struct cfg80211_registered_device *rdev,
if ((rdev->wiphy.flags & WIPHY_FLAG_TDLS_EXTERNAL_SETUP) &&
nla_put_flag(msg, NL80211_ATTR_TDLS_EXTERNAL_SETUP))
goto nla_put_failure;
+ if ((rdev->wiphy.flags & WIPHY_FLAG_DFS_OFFLOAD) &&
+ nla_put_flag(msg, NL80211_ATTR_DFS_OFFLOAD))
+ goto nla_put_failure;
state->split_start++;
if (state->split)
break;
@@ -7816,6 +7819,10 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
if (!cfg80211_chandef_dfs_usable(wdev->wiphy, &chandef))
return -EINVAL;
+ /* CAC start is offloaded to HW and can't be started manually */
+ if (wdev->wiphy->flags & WIPHY_FLAG_DFS_OFFLOAD)
+ return -EOPNOTSUPP;
+
if (!rdev->ops->start_radar_detection)
return -EOPNOTSUPP;
--
2.11.0
