Commit 04837f64 authored by Marcel Holtmann's avatar Marcel Holtmann Committed by David S. Miller
Browse files

[Bluetooth] Add automatic sniff mode support 



This patch introduces the automatic sniff mode feature. This allows
the host to switch idle connections into sniff mode to safe power.

Signed-off-by: default avatarUlisses Furquim <ulissesf@gmail.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent da1f5198

include/net/bluetooth/hci.h

+56 −14
Original line number Diff line number Diff line
@@ -101,9 +101,10 @@ enum { 
#define HCIINQUIRY	_IOR('H', 240, int)



/* HCI timeouts */

#define HCI_CONN_TIMEOUT	(HZ * 40)

#define HCI_DISCONN_TIMEOUT	(HZ * 2)

#define HCI_CONN_IDLE_TIMEOUT	(HZ * 60)

#define HCI_CONNECT_TIMEOUT	(40000)	/* 40 seconds */

#define HCI_DISCONN_TIMEOUT	(2000)	/* 2 seconds */

#define HCI_IDLE_TIMEOUT	(6000)	/* 6 seconds */

#define HCI_INIT_TIMEOUT	(10000)	/* 10 seconds */



/* HCI Packet types */

#define HCI_COMMAND_PKT		0x01
@@ -145,7 +146,7 @@ enum { 
#define LMP_TACCURACY	0x10

#define LMP_RSWITCH	0x20

#define LMP_HOLD	0x40

#define LMP_SNIF	0x80

#define LMP_SNIFF	0x80



#define LMP_PARK	0x01

#define LMP_RSSI	0x02
@@ -160,13 +161,21 @@ enum { 
#define LMP_PSCHEME	0x02

#define LMP_PCONTROL	0x04



#define LMP_SNIFF_SUBR	0x02



/* Connection modes */

#define HCI_CM_ACTIVE	0x0000

#define HCI_CM_HOLD	0x0001

#define HCI_CM_SNIFF	0x0002

#define HCI_CM_PARK	0x0003



/* Link policies */

#define HCI_LP_RSWITCH	0x0001

#define HCI_LP_HOLD	0x0002

#define HCI_LP_SNIFF	0x0004

#define HCI_LP_PARK	0x0008



/* Link mode */

/* Link modes */

#define HCI_LM_ACCEPT	0x8000

#define HCI_LM_MASTER	0x0001

#define HCI_LM_AUTH	0x0002
@@ -192,7 +201,7 @@ struct hci_rp_read_loc_version { 
} __attribute__ ((packed));



#define OCF_READ_LOCAL_FEATURES	0x0003

struct hci_rp_read_loc_features {

struct hci_rp_read_local_features {

	__u8 status;

	__u8 features[8];

} __attribute__ ((packed));
@@ -376,17 +385,32 @@ struct hci_cp_change_conn_link_key { 
} __attribute__ ((packed));



#define OCF_READ_REMOTE_FEATURES 0x001B

struct hci_cp_read_rmt_features {

struct hci_cp_read_remote_features {

	__le16   handle;

} __attribute__ ((packed));



#define OCF_READ_REMOTE_VERSION 0x001D

struct hci_cp_read_rmt_version {

struct hci_cp_read_remote_version {

	__le16   handle;

} __attribute__ ((packed));



/* Link Policy */

#define OGF_LINK_POLICY	0x02   



#define OCF_SNIFF_MODE		0x0003

struct hci_cp_sniff_mode {

	__le16   handle;

	__le16   max_interval;

	__le16   min_interval;

	__le16   attempt;

	__le16   timeout;

} __attribute__ ((packed));



#define OCF_EXIT_SNIFF_MODE	0x0004

struct hci_cp_exit_sniff_mode {

	__le16   handle;

} __attribute__ ((packed));



#define OCF_ROLE_DISCOVERY	0x0009

struct hci_cp_role_discovery {

	__le16   handle;
@@ -423,6 +447,14 @@ struct hci_rp_write_link_policy { 
	__le16   handle;

} __attribute__ ((packed));



#define OCF_SNIFF_SUBRATE	0x0011

struct hci_cp_sniff_subrate {

	__le16   handle;

	__le16   max_latency;

	__le16   min_remote_timeout;

	__le16   min_local_timeout;

} __attribute__ ((packed));



/* Status params */

#define OGF_STATUS_PARAM	0x05
@@ -582,15 +614,15 @@ struct hci_ev_link_key_notify { 
	__u8	 key_type;

} __attribute__ ((packed));



#define HCI_EV_RMT_FEATURES	0x0B

struct hci_ev_rmt_features {

#define HCI_EV_REMOTE_FEATURES	0x0B

struct hci_ev_remote_features {

	__u8     status;

	__le16   handle;

	__u8     features[8];

} __attribute__ ((packed));



#define HCI_EV_RMT_VERSION	0x0C

struct hci_ev_rmt_version {

#define HCI_EV_REMOTE_VERSION	0x0C

struct hci_ev_remote_version {

	__u8     status;

	__le16   handle;

	__u8     lmp_ver;
@@ -611,6 +643,16 @@ struct hci_ev_pscan_rep_mode { 
	__u8     pscan_rep_mode;

} __attribute__ ((packed));



#define HCI_EV_SNIFF_SUBRATE	0x2E

struct hci_ev_sniff_subrate {

	__u8     status;

	__le16   handle;

	__le16   max_tx_latency;

	__le16   max_rx_latency;

	__le16   max_remote_timeout;

	__le16   max_local_timeout;

} __attribute__ ((packed));



/* Internal events generated by Bluetooth stack */

#define HCI_EV_STACK_INTERNAL	0xFD

struct hci_ev_stack_internal {

include/net/bluetooth/hci_core.h

+30 −24
Original line number Diff line number Diff line
@@ -31,10 +31,7 @@ 
#define HCI_PROTO_L2CAP	0

#define HCI_PROTO_SCO	1



#define HCI_INIT_TIMEOUT (HZ * 10)



/* HCI Core structures */



struct inquiry_data {

	bdaddr_t	bdaddr;

	__u8		pscan_rep_mode;
@@ -81,6 +78,10 @@ struct hci_dev { 
	__u16		link_policy;

	__u16		link_mode;



	__u32		idle_timeout;

	__u16		sniff_min_interval;

	__u16		sniff_max_interval;



	unsigned long	quirks;



	atomic_t	cmd_cnt;
@@ -145,17 +146,23 @@ struct hci_conn { 
	bdaddr_t	 dst;

	__u16		 handle;

	__u16		 state;

	__u8             mode;

	__u8		 type;

	__u8		 out;

	__u8		 dev_class[3];

	__u8             features[8];

	__u16            interval;

	__u16            link_policy;

	__u32		 link_mode;

	__u8             power_save;

	unsigned long	 pend;



	unsigned int	 sent;



	struct sk_buff_head data_q;



	struct timer_list timer;

	struct timer_list disc_timer;

	struct timer_list idle_timer;



	struct hci_dev	*hdev;

	void		*l2cap_data;
@@ -211,7 +218,8 @@ void hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data); 
enum {

	HCI_CONN_AUTH_PEND,

	HCI_CONN_ENCRYPT_PEND,

	HCI_CONN_RSWITCH_PEND

	HCI_CONN_RSWITCH_PEND,

	HCI_CONN_MODE_CHANGE_PEND,

};



static inline void hci_conn_hash_init(struct hci_dev *hdev)
@@ -286,31 +294,27 @@ int hci_conn_encrypt(struct hci_conn *conn); 
int hci_conn_change_link_key(struct hci_conn *conn);

int hci_conn_switch_role(struct hci_conn *conn, uint8_t role);



static inline void hci_conn_set_timer(struct hci_conn *conn, unsigned long timeout)

{

	mod_timer(&conn->timer, jiffies + timeout);

}



static inline void hci_conn_del_timer(struct hci_conn *conn)

{

	del_timer(&conn->timer);

}

void hci_conn_enter_active_mode(struct hci_conn *conn);

void hci_conn_enter_sniff_mode(struct hci_conn *conn);



static inline void hci_conn_hold(struct hci_conn *conn)

{

	atomic_inc(&conn->refcnt);

	hci_conn_del_timer(conn);

	del_timer(&conn->disc_timer);

}



static inline void hci_conn_put(struct hci_conn *conn)

{

	if (atomic_dec_and_test(&conn->refcnt)) {

		unsigned long timeo;

		if (conn->type == ACL_LINK) {

			unsigned long timeo = (conn->out) ?

				HCI_DISCONN_TIMEOUT : HCI_DISCONN_TIMEOUT * 2;

			hci_conn_set_timer(conn, timeo);

			timeo = msecs_to_jiffies(HCI_DISCONN_TIMEOUT);

			if (!conn->out)

				timeo *= 2;

			del_timer(&conn->idle_timer);

		} else

			hci_conn_set_timer(conn, HZ / 100);

			timeo = msecs_to_jiffies(10);

		mod_timer(&conn->disc_timer, jiffies + timeo);

	}

}
@@ -411,8 +415,10 @@ void hci_unregister_sysfs(struct hci_dev *hdev); 
#define SET_HCIDEV_DEV(hdev, pdev) ((hdev)->class_dev.dev = (pdev))



/* ----- LMP capabilities ----- */

#define lmp_rswitch_capable(dev) (dev->features[0] & LMP_RSWITCH)

#define lmp_encrypt_capable(dev) (dev->features[0] & LMP_ENCRYPT)

#define lmp_rswitch_capable(dev)   ((dev)->features[0] & LMP_RSWITCH)

#define lmp_encrypt_capable(dev)   ((dev)->features[0] & LMP_ENCRYPT)

#define lmp_sniff_capable(dev)     ((dev)->features[0] & LMP_SNIFF)

#define lmp_sniffsubr_capable(dev) ((dev)->features[5] & LMP_SNIFF_SUBR)



/* ----- HCI protocols ----- */

struct hci_proto {

net/bluetooth/af_bluetooth.c

+1 −1
Original line number Diff line number Diff line
@@ -48,7 +48,7 @@ 
#define BT_DBG(D...)

#endif



#define VERSION "2.8"

#define VERSION "2.9"



/* Bluetooth sockets */

#define BT_MAX_PROTO	8

net/bluetooth/hci_conn.c

+89 −11
Original line number Diff line number Diff line
@@ -132,11 +132,13 @@ static void hci_conn_timeout(unsigned long arg) 
	return;

}



static void hci_conn_init_timer(struct hci_conn *conn)

static void hci_conn_idle(unsigned long arg)

{

	init_timer(&conn->timer);

	conn->timer.function = hci_conn_timeout;

	conn->timer.data = (unsigned long)conn;

	struct hci_conn *conn = (void *) arg;



	BT_DBG("conn %p mode %d", conn, conn->mode);



	hci_conn_enter_sniff_mode(conn);

}



struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
@@ -145,17 +147,27 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst) 


	BT_DBG("%s dst %s", hdev->name, batostr(dst));



	if (!(conn = kmalloc(sizeof(struct hci_conn), GFP_ATOMIC)))

	conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);

	if (!conn)

		return NULL;

	memset(conn, 0, sizeof(struct hci_conn));



	bacpy(&conn->dst, dst);

	conn->type   = type;

	conn->hdev   = hdev;

	conn->type   = type;

	conn->mode   = HCI_CM_ACTIVE;

	conn->state  = BT_OPEN;



	conn->power_save = 1;



	skb_queue_head_init(&conn->data_q);

	hci_conn_init_timer(conn);



	init_timer(&conn->disc_timer);

	conn->disc_timer.function = hci_conn_timeout;

	conn->disc_timer.data = (unsigned long) conn;



	init_timer(&conn->idle_timer);

	conn->idle_timer.function = hci_conn_idle;

	conn->idle_timer.data = (unsigned long) conn;



	atomic_set(&conn->refcnt, 0);
@@ -178,7 +190,9 @@ int hci_conn_del(struct hci_conn *conn) 


	BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);



	hci_conn_del_timer(conn);

	del_timer(&conn->idle_timer);



	del_timer(&conn->disc_timer);



	if (conn->type == SCO_LINK) {

		struct hci_conn *acl = conn->link;
@@ -364,6 +378,70 @@ int hci_conn_switch_role(struct hci_conn *conn, uint8_t role) 
}

EXPORT_SYMBOL(hci_conn_switch_role);



/* Enter active mode */

void hci_conn_enter_active_mode(struct hci_conn *conn)

{

	struct hci_dev *hdev = conn->hdev;



	BT_DBG("conn %p mode %d", conn, conn->mode);



	if (test_bit(HCI_RAW, &hdev->flags))

		return;



	if (conn->mode != HCI_CM_SNIFF || !conn->power_save)

		goto timer;



	if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {

		struct hci_cp_exit_sniff_mode cp;

		cp.handle = __cpu_to_le16(conn->handle);

		hci_send_cmd(hdev, OGF_LINK_POLICY,

				OCF_EXIT_SNIFF_MODE, sizeof(cp), &cp);

	}



timer:

	if (hdev->idle_timeout > 0)

		mod_timer(&conn->idle_timer,

			jiffies + msecs_to_jiffies(hdev->idle_timeout));

}



/* Enter sniff mode */

void hci_conn_enter_sniff_mode(struct hci_conn *conn)

{

	struct hci_dev *hdev = conn->hdev;



	BT_DBG("conn %p mode %d", conn, conn->mode);



	if (test_bit(HCI_RAW, &hdev->flags))

		return;



	if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))

		return;



	if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))

		return;



	if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {

		struct hci_cp_sniff_subrate cp;

		cp.handle             = __cpu_to_le16(conn->handle);

		cp.max_latency        = __constant_cpu_to_le16(0);

		cp.min_remote_timeout = __constant_cpu_to_le16(0);

		cp.min_local_timeout  = __constant_cpu_to_le16(0);

		hci_send_cmd(hdev, OGF_LINK_POLICY,

				OCF_SNIFF_SUBRATE, sizeof(cp), &cp);

	}



	if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {

		struct hci_cp_sniff_mode cp;

		cp.handle       = __cpu_to_le16(conn->handle);

		cp.max_interval = __cpu_to_le16(hdev->sniff_max_interval);

		cp.min_interval = __cpu_to_le16(hdev->sniff_min_interval);

		cp.attempt      = __constant_cpu_to_le16(4);

		cp.timeout      = __constant_cpu_to_le16(1);

		hci_send_cmd(hdev, OGF_LINK_POLICY,

				OCF_SNIFF_MODE, sizeof(cp), &cp);

	}

}



/* Drop all connection on the device */

void hci_conn_hash_flush(struct hci_dev *hdev)

{

net/bluetooth/hci_core.c

+24 −10
Original line number Diff line number Diff line
@@ -411,7 +411,7 @@ int hci_inquiry(void __user *arg) 
	}

	hci_dev_unlock_bh(hdev);



	timeo = ir.length * 2 * HZ;

	timeo = ir.length * msecs_to_jiffies(2000);

	if (do_inquiry && (err = hci_request(hdev, hci_inq_req, (unsigned long)&ir, timeo)) < 0)

		goto done;
@@ -479,7 +479,8 @@ int hci_dev_open(__u16 dev) 
		set_bit(HCI_INIT, &hdev->flags);



		//__hci_request(hdev, hci_reset_req, 0, HZ);

		ret = __hci_request(hdev, hci_init_req, 0, HCI_INIT_TIMEOUT);

		ret = __hci_request(hdev, hci_init_req, 0,

					msecs_to_jiffies(HCI_INIT_TIMEOUT));



		clear_bit(HCI_INIT, &hdev->flags);

	}
@@ -546,7 +547,8 @@ static int hci_dev_do_close(struct hci_dev *hdev) 
	atomic_set(&hdev->cmd_cnt, 1);

	if (!test_bit(HCI_RAW, &hdev->flags)) {

		set_bit(HCI_INIT, &hdev->flags);

		__hci_request(hdev, hci_reset_req, 0, HZ/4);

		__hci_request(hdev, hci_reset_req, 0,

					msecs_to_jiffies(250));

		clear_bit(HCI_INIT, &hdev->flags);

	}
@@ -619,7 +621,8 @@ int hci_dev_reset(__u16 dev) 
	hdev->acl_cnt = 0; hdev->sco_cnt = 0;



	if (!test_bit(HCI_RAW, &hdev->flags))

		ret = __hci_request(hdev, hci_reset_req, 0, HCI_INIT_TIMEOUT);

		ret = __hci_request(hdev, hci_reset_req, 0,

					msecs_to_jiffies(HCI_INIT_TIMEOUT));



done:

	tasklet_enable(&hdev->tx_task);
@@ -657,7 +660,8 @@ int hci_dev_cmd(unsigned int cmd, void __user *arg) 


	switch (cmd) {

	case HCISETAUTH:

		err = hci_request(hdev, hci_auth_req, dr.dev_opt, HCI_INIT_TIMEOUT);

		err = hci_request(hdev, hci_auth_req, dr.dev_opt,

					msecs_to_jiffies(HCI_INIT_TIMEOUT));

		break;



	case HCISETENCRYPT:
@@ -668,18 +672,19 @@ int hci_dev_cmd(unsigned int cmd, void __user *arg) 


		if (!test_bit(HCI_AUTH, &hdev->flags)) {

			/* Auth must be enabled first */

			err = hci_request(hdev, hci_auth_req,

					dr.dev_opt, HCI_INIT_TIMEOUT);

			err = hci_request(hdev, hci_auth_req, dr.dev_opt,

					msecs_to_jiffies(HCI_INIT_TIMEOUT));

			if (err)

				break;

		}



		err = hci_request(hdev, hci_encrypt_req,

					dr.dev_opt, HCI_INIT_TIMEOUT);

		err = hci_request(hdev, hci_encrypt_req, dr.dev_opt,

					msecs_to_jiffies(HCI_INIT_TIMEOUT));

		break;



	case HCISETSCAN:

		err = hci_request(hdev, hci_scan_req, dr.dev_opt, HCI_INIT_TIMEOUT);

		err = hci_request(hdev, hci_scan_req, dr.dev_opt,

					msecs_to_jiffies(HCI_INIT_TIMEOUT));

		break;



	case HCISETPTYPE:
@@ -848,6 +853,10 @@ int hci_register_dev(struct hci_dev *hdev) 
	hdev->pkt_type  = (HCI_DM1 | HCI_DH1 | HCI_HV1);

	hdev->link_mode = (HCI_LM_ACCEPT);



	hdev->idle_timeout = 0;

	hdev->sniff_max_interval = 800;

	hdev->sniff_min_interval = 80;



	tasklet_init(&hdev->cmd_task, hci_cmd_task,(unsigned long) hdev);

	tasklet_init(&hdev->rx_task, hci_rx_task, (unsigned long) hdev);

	tasklet_init(&hdev->tx_task, hci_tx_task, (unsigned long) hdev);
@@ -1220,6 +1229,9 @@ static inline void hci_sched_acl(struct hci_dev *hdev) 
	while (hdev->acl_cnt && (conn = hci_low_sent(hdev, ACL_LINK, &quote))) {

		while (quote-- && (skb = skb_dequeue(&conn->data_q))) {

			BT_DBG("skb %p len %d", skb, skb->len);



			hci_conn_enter_active_mode(conn);



			hci_send_frame(skb);

			hdev->acl_last_tx = jiffies;
@@ -1298,6 +1310,8 @@ static inline void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb) 
	if (conn) {

		register struct hci_proto *hp;



		hci_conn_enter_active_mode(conn);



		/* Send to upper protocol */

		if ((hp = hci_proto[HCI_PROTO_L2CAP]) && hp->recv_acldata) {

			hp->recv_acldata(conn, skb, flags);

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