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
......@@ -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 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;
......@@ -407,7 +431,7 @@ struct hci_rp_read_link_policy {
__le16 policy;
} __attribute__ ((packed));
#define OCF_SWITCH_ROLE 0x000B
#define OCF_SWITCH_ROLE 0x000B
struct hci_cp_switch_role {
bdaddr_t bdaddr;
__u8 role;
......@@ -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 {
......
......@@ -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;
......@@ -145,18 +146,24 @@ 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;
void *sco_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 {
......
......@@ -48,7 +48,7 @@
#define BT_DBG(D...)
#endif
#define VERSION "2.8"
#define VERSION "2.9"
/* Bluetooth sockets */
#define BT_MAX_PROTO 8
......
......@@ -115,8 +115,8 @@ void hci_add_sco(struct hci_conn *conn, __u16 handle)
static void hci_conn_timeout(unsigned long arg)
{
struct hci_conn *conn = (void *)arg;
struct hci_dev *hdev = conn->hdev;
struct hci_conn *conn = (void *) arg;
struct hci_dev *hdev = conn->hdev;
BT_DBG("conn %p state %d", conn, conn->state);
......@@ -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)
{
......
......@@ -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);
......
......@@ -83,6 +83,8 @@ static void hci_cc_link_policy(struct hci_dev *hdev, __u16 ocf, struct sk_buff *
{
struct hci_conn *conn;
struct hci_rp_role_discovery *rd;
struct hci_rp_write_link_policy *lp;
void *sent;
BT_DBG("%s ocf 0x%x", hdev->name, ocf);
......@@ -106,6 +108,27 @@ static void hci_cc_link_policy(struct hci_dev *hdev, __u16 ocf, struct sk_buff *
hci_dev_unlock(hdev);
break;
case OCF_WRITE_LINK_POLICY:
sent = hci_sent_cmd_data(hdev, OGF_LINK_POLICY, OCF_WRITE_LINK_POLICY);
if (!sent)
break;
lp = (struct hci_rp_write_link_policy *) skb->data;
if (lp->status)
break;
hci_dev_lock(hdev);
conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(lp->handle));
if (conn) {
__le16 policy = get_unaligned((__le16 *) (sent + 2));
conn->link_policy = __le16_to_cpu(policy);
}
hci_dev_unlock(hdev);
break;
default:
BT_DBG("%s: Command complete: ogf LINK_POLICY ocf %x",
hdev->name, ocf);
......@@ -274,7 +297,7 @@ static void hci_cc_host_ctl(struct hci_dev *hdev, __u16 ocf, struct sk_buff *skb
/* Command Complete OGF INFO_PARAM */
static void hci_cc_info_param(struct hci_dev *hdev, __u16 ocf, struct sk_buff *skb)
{
struct hci_rp_read_loc_features *lf;
struct hci_rp_read_local_features *lf;
struct hci_rp_read_buffer_size *bs;
struct hci_rp_read_bd_addr *ba;
......@@ -282,7 +305,7 @@ static void hci_cc_info_param(struct hci_dev *hdev, __u16 ocf, struct sk_buff *s
switch (ocf) {
case OCF_READ_LOCAL_FEATURES:
lf = (struct hci_rp_read_loc_features *) skb->data;
lf = (struct hci_rp_read_local_features *) skb->data;
if (lf->status) {
BT_DBG("%s READ_LOCAL_FEATURES failed %d", hdev->name, lf->status);
......@@ -447,8 +470,46 @@ static void hci_cs_link_policy(struct hci_dev *hdev, __u16 ocf, __u8 status)
BT_DBG("%s ocf 0x%x", hdev->name, ocf);
switch (ocf) {
case OCF_SNIFF_MODE:
if (status) {
struct hci_conn *conn;
struct hci_cp_sniff_mode *cp = hci_sent_cmd_data(hdev, OGF_LINK_POLICY, OCF_SNIFF_MODE);
if (!cp)
break;
hci_dev_lock(hdev);
conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(cp->handle));
if (conn) {
clear_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend);
}
hci_dev_unlock(hdev);
}
break;
case OCF_EXIT_SNIFF_MODE:
if (status) {
struct hci_conn *conn;
struct hci_cp_exit_sniff_mode *cp = hci_sent_cmd_data(hdev, OGF_LINK_POLICY, OCF_EXIT_SNIFF_MODE);
if (!cp)
break;
hci_dev_lock(hdev);
conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(cp->handle));
if (conn) {
clear_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend);
}
hci_dev_unlock(hdev);
}
break;
default:
BT_DBG("%s Command status: ogf HOST_POLICY ocf %x", hdev->name, ocf);
BT_DBG("%s Command status: ogf LINK_POLICY ocf %x", hdev->name, ocf);
break;
}
}
......@@ -630,14 +691,16 @@ static inline void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *sk
else
cp.role = 0x01; /* Remain slave */
hci_send_cmd(hdev, OGF_LINK_CTL, OCF_ACCEPT_CONN_REQ, sizeof(cp), &cp);
hci_send_cmd(hdev, OGF_LINK_CTL,
OCF_ACCEPT_CONN_REQ, sizeof(cp), &cp);
} else {
/* Connection rejected */
struct hci_cp_reject_conn_req cp;