[PATCH v6 01/16] Bluetooth: hci_core: Introduce multi-adv inst list

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The current hci dev structure only supports a single advertising
instance. To support multi-instance advertising it is necessary to
introduce a linked list of advertising instances so that multiple
advertising instances can be dynamically added and/or removed.

In a first step, the existing adv_instance member of the hci_dev
struct is supplemented by a linked list of advertising instances.
This patch introduces the list and supporting list management
infrastructure. The list is not being used yet.

Signed-off-by: Florian Grandel <fgrandel@xxxxxxxxx>
---
 include/net/bluetooth/hci_core.h |  15 ++++++
 net/bluetooth/hci_core.c         | 111 +++++++++++++++++++++++++++++++++++++++
 net/bluetooth/mgmt.c             |  10 ++--
 3 files changed, 131 insertions(+), 5 deletions(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index a056c2b..d92d324 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -156,6 +156,8 @@ struct oob_data {
 };
 
 struct adv_info {
+	struct list_head list;
+	struct hci_dev *hdev;
 	struct delayed_work timeout_exp;
 	__u8	instance;
 	__u32	flags;
@@ -166,6 +168,8 @@ struct adv_info {
 	__u8	scan_rsp_data[HCI_MAX_AD_LENGTH];
 };
 
+#define HCI_MAX_ADV_INSTANCES		1
+
 #define HCI_MAX_SHORT_NAME_LENGTH	10
 
 /* Default LE RPA expiry time, 15 minutes */
@@ -374,6 +378,9 @@ struct hci_dev {
 	__u8			scan_rsp_data_len;
 
 	struct adv_info		adv_instance;
+	struct list_head	adv_instances;
+	unsigned int		adv_instance_cnt;
+	__u8			cur_adv_instance;
 
 	__u8			irk[16];
 	__u32			rpa_timeout;
@@ -1007,6 +1014,14 @@ int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr,
 int hci_remove_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr,
 			       u8 bdaddr_type);
 
+void hci_adv_instances_clear(struct hci_dev *hdev);
+struct adv_info *hci_find_adv_instance(struct hci_dev *hdev, u8 instance);
+int hci_add_adv_instance(struct hci_dev *hdev, u8 instance, u32 flags,
+			 u16 adv_data_len, u8 *adv_data,
+			 u16 scan_rsp_len, u8 *scan_rsp_data,
+			 work_func_t timeout_work, u16 timeout);
+int hci_remove_adv_instance(struct hci_dev *hdev, u8 instance);
+
 void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb);
 
 int hci_recv_frame(struct hci_dev *hdev, struct sk_buff *skb);
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index db11b9d..1ec557f 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2609,6 +2609,113 @@ int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr,
 	return 0;
 }
 
+/* This function requires the caller holds hdev->lock */
+struct adv_info *hci_find_adv_instance(struct hci_dev *hdev, u8 instance)
+{
+	struct adv_info *adv_instance;
+
+	list_for_each_entry(adv_instance, &hdev->adv_instances, list) {
+		if (adv_instance->instance == instance)
+			return adv_instance;
+	}
+
+	return NULL;
+}
+
+/* This function requires the caller holds hdev->lock */
+int hci_remove_adv_instance(struct hci_dev *hdev, u8 instance)
+{
+	struct adv_info *adv_instance;
+
+	adv_instance = hci_find_adv_instance(hdev, instance);
+	if (!adv_instance)
+		return -ENOENT;
+
+	BT_DBG("%s removing %dMR", hdev->name, instance);
+
+	if (adv_instance->timeout)
+		cancel_delayed_work(&adv_instance->timeout_exp);
+
+	list_del(&adv_instance->list);
+	kfree(adv_instance);
+
+	hdev->adv_instance_cnt--;
+
+	return 0;
+}
+
+/* This function requires the caller holds hdev->lock */
+void hci_adv_instances_clear(struct hci_dev *hdev)
+{
+	struct adv_info *adv_instance, *n;
+
+	list_for_each_entry_safe(adv_instance, n, &hdev->adv_instances, list) {
+		if (adv_instance->timeout)
+			cancel_delayed_work(&adv_instance->timeout_exp);
+
+		list_del(&adv_instance->list);
+		kfree(adv_instance);
+	}
+
+	hdev->adv_instance_cnt = 0;
+}
+
+/* This function requires the caller holds hdev->lock */
+int hci_add_adv_instance(struct hci_dev *hdev, u8 instance, u32 flags,
+			 u16 adv_data_len, u8 *adv_data,
+			 u16 scan_rsp_len, u8 *scan_rsp_data,
+			 work_func_t timeout_work, u16 timeout)
+{
+	struct adv_info *adv_instance;
+
+	adv_instance = hci_find_adv_instance(hdev, instance);
+	if (adv_instance) {
+		if (adv_instance->timeout)
+			cancel_delayed_work(&adv_instance->timeout_exp);
+
+		memset(adv_instance->adv_data, 0,
+		       sizeof(adv_instance->adv_data));
+		memset(adv_instance->scan_rsp_data, 0,
+		       sizeof(adv_instance->scan_rsp_data));
+	} else {
+		if (hdev->adv_instance_cnt >= HCI_MAX_ADV_INSTANCES)
+			return -EOVERFLOW;
+
+		adv_instance = kmalloc(sizeof(*adv_instance), GFP_KERNEL);
+		if (!adv_instance)
+			return -ENOMEM;
+
+		memset(adv_instance, 0, sizeof(*adv_instance));
+		adv_instance->hdev = hdev;
+		INIT_DELAYED_WORK(&adv_instance->timeout_exp, timeout_work);
+		adv_instance->instance = instance;
+		list_add(&adv_instance->list, &hdev->adv_instances);
+		hdev->adv_instance_cnt++;
+	}
+
+	adv_instance->flags = flags;
+	adv_instance->adv_data_len = adv_data_len;
+	adv_instance->scan_rsp_len = scan_rsp_len;
+
+	if (adv_data_len)
+		memcpy(adv_instance->adv_data, adv_data, adv_data_len);
+
+	if (scan_rsp_len)
+		memcpy(adv_instance->scan_rsp_data,
+		       scan_rsp_data, scan_rsp_len);
+
+	adv_instance->timeout = timeout;
+
+	if (timeout)
+		queue_delayed_work(hdev->workqueue,
+				   &adv_instance->timeout_exp,
+				   msecs_to_jiffies(timeout * 1000));
+
+	BT_DBG("%s for %dMR", hdev->name, instance);
+
+	return 0;
+}
+
 struct bdaddr_list *hci_bdaddr_list_lookup(struct list_head *bdaddr_list,
 					 bdaddr_t *bdaddr, u8 type)
 {
@@ -3012,6 +3119,8 @@ struct hci_dev *hci_alloc_dev(void)
 	hdev->manufacturer = 0xffff;	/* Default to internal use */
 	hdev->inq_tx_power = HCI_TX_POWER_INVALID;
 	hdev->adv_tx_power = HCI_TX_POWER_INVALID;
+	hdev->adv_instance_cnt = 0;
+	hdev->cur_adv_instance = 0x00;
 
 	hdev->sniff_max_interval = 800;
 	hdev->sniff_min_interval = 80;
@@ -3053,6 +3162,7 @@ struct hci_dev *hci_alloc_dev(void)
 	INIT_LIST_HEAD(&hdev->pend_le_conns);
 	INIT_LIST_HEAD(&hdev->pend_le_reports);
 	INIT_LIST_HEAD(&hdev->conn_hash.list);
+	INIT_LIST_HEAD(&hdev->adv_instances);
 
 	INIT_WORK(&hdev->rx_work, hci_rx_work);
 	INIT_WORK(&hdev->cmd_work, hci_cmd_work);
@@ -3246,6 +3356,7 @@ void hci_unregister_dev(struct hci_dev *hdev)
 	hci_smp_ltks_clear(hdev);
 	hci_smp_irks_clear(hdev);
 	hci_remote_oob_data_clear(hdev);
+	hci_adv_instances_clear(hdev);
 	hci_bdaddr_list_clear(&hdev->le_white_list);
 	hci_conn_params_clear_all(hdev);
 	hci_discovery_filter_clear(hdev);
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 7fd87e7..ce25b6d 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -6813,7 +6813,7 @@ static int read_adv_features(struct sock *sk, struct hci_dev *hdev,
 	rp->supported_flags = cpu_to_le32(supported_flags);
 	rp->max_adv_data_len = HCI_MAX_AD_LENGTH;
 	rp->max_scan_rsp_len = HCI_MAX_AD_LENGTH;
-	rp->max_instances = 1;
+	rp->max_instances = HCI_MAX_ADV_INSTANCES;
 
 	/* Currently only one instance is supported, so simply return the
 	 * current instance number.
@@ -6916,11 +6916,11 @@ unlock:
 
 static void adv_timeout_expired(struct work_struct *work)
 {
-	struct hci_dev *hdev = container_of(work, struct hci_dev,
-					    adv_instance.timeout_exp.work);
-
-	hdev->adv_instance.timeout = 0;
+	struct adv_info *adv_instance = container_of(work, struct adv_info,
+						     timeout_exp.work);
+	struct hci_dev *hdev = adv_instance->hdev;
 
+	adv_instance->timeout = 0;
 	hci_dev_lock(hdev);
 	clear_adv_instance(hdev);
 	hci_dev_unlock(hdev);
-- 
1.9.1

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