mac802154: Handle passive scanning

Implement the core hooks in order to provide the softMAC layer support
for passive scans. Scans are requested by the user and can be aborted.

Changing channels manually is prohibited during scans.

The implementation uses a workqueue triggered at a certain interval
depending on the symbol duration for the current channel and the
duration order provided. More advanced drivers with internal scheduling
capabilities might require additional care but there is none mainline
yet.

Received beacons during a passive scan are processed in a work queue and
their result forwarded to the upper layer.

Active scanning is not supported yet.

Co-developed-by: David Girault <david.girault@qorvo.com>
Signed-off-by: David Girault <david.girault@qorvo.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20230103165644.432209-7-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>

1 files changed, 15 insertions, 1 deletions

diff --git a/net/mac802154/main.c b/net/mac802154/main.c
index 12a13a850fdf..b1111279e06d 100644
--- a/net/mac802154/main.c
+++ b/net/mac802154/main.c
@@ -89,6 +89,7 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
 	local->ops = ops;
 
 	INIT_LIST_HEAD(&local->interfaces);
+	INIT_LIST_HEAD(&local->rx_beacon_list);
 	mutex_init(&local->iflist_mtx);
 
 	tasklet_setup(&local->tasklet, ieee802154_tasklet_handler);
@@ -96,6 +97,8 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
 	skb_queue_head_init(&local->skb_queue);
 
 	INIT_WORK(&local->sync_tx_work, ieee802154_xmit_sync_worker);
+	INIT_DELAYED_WORK(&local->scan_work, mac802154_scan_worker);
+	INIT_WORK(&local->rx_beacon_work, mac802154_rx_beacon_worker);
 
 	/* init supported flags with 802.15.4 default ranges */
 	phy->supported.max_minbe = 8;
@@ -185,6 +188,7 @@ static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
 int ieee802154_register_hw(struct ieee802154_hw *hw)
 {
 	struct ieee802154_local *local = hw_to_local(hw);
+	char mac_wq_name[IFNAMSIZ + 10] = {};
 	struct net_device *dev;
 	int rc = -ENOSYS;
 
@@ -195,6 +199,13 @@ int ieee802154_register_hw(struct ieee802154_hw *hw)
 		goto out;
 	}
 
+	snprintf(mac_wq_name, IFNAMSIZ + 10, "%s-mac-cmds", wpan_phy_name(local->phy));
+	local->mac_wq =	create_singlethread_workqueue(mac_wq_name);
+	if (!local->mac_wq) {
+		rc = -ENOMEM;
+		goto out_wq;
+	}
+
 	hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	local->ifs_timer.function = ieee802154_xmit_ifs_timer;
 
@@ -224,7 +235,7 @@ int ieee802154_register_hw(struct ieee802154_hw *hw)
 
 	rc = wpan_phy_register(local->phy);
 	if (rc < 0)
-		goto out_wq;
+		goto out_mac_wq;
 
 	rtnl_lock();
 
@@ -243,6 +254,8 @@ int ieee802154_register_hw(struct ieee802154_hw *hw)
 
 out_phy:
 	wpan_phy_unregister(local->phy);
+out_mac_wq:
+	destroy_workqueue(local->mac_wq);
 out_wq:
 	destroy_workqueue(local->workqueue);
 out:
@@ -263,6 +276,7 @@ void ieee802154_unregister_hw(struct ieee802154_hw *hw)
 
 	rtnl_unlock();
 
+	destroy_workqueue(local->mac_wq);
 	destroy_workqueue(local->workqueue);
 	wpan_phy_unregister(local->phy);
 }