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SubjectRe: [PATCH v1 2/7] Bluetooth: Add handler of MGMT_OP_READ_ADV_MONITOR_FEATURES
Hi Marcel,

Thanks for your review. V2 was uploaded to address these 3 comments.

Regards,
Miao

On Wed, Jun 3, 2020 at 10:59 AM Marcel Holtmann <marcel@holtmann.org> wrote:
>
> Hi Miao-chen,
>
> > This adds the request handler of MGMT_OP_READ_ADV_MONITOR_FEATURES
> > command. Since the controller-based monitoring is not yet in place, this
> > report only the supported features but not the enabled features.
> >
> > The following test was performed.
> > - Issuing btmgmt advmon-features.
> >
> > Signed-off-by: Miao-chen Chou <mcchou@chromium.org>
> > ---
> >
> > include/net/bluetooth/hci_core.h | 24 +++++++++++++++++
> > net/bluetooth/hci_core.c | 10 ++++++-
> > net/bluetooth/mgmt.c | 46 ++++++++++++++++++++++++++++++++
> > net/bluetooth/msft.c | 7 +++++
> > net/bluetooth/msft.h | 9 +++++++
> > 5 files changed, 95 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
> > index cdd4f1db8670e..431fe0265dcfb 100644
> > --- a/include/net/bluetooth/hci_core.h
> > +++ b/include/net/bluetooth/hci_core.h
> > @@ -25,6 +25,7 @@
> > #ifndef __HCI_CORE_H
> > #define __HCI_CORE_H
> >
> > +#include <linux/idr.h>
> > #include <linux/leds.h>
> > #include <linux/rculist.h>
> >
> > @@ -220,6 +221,24 @@ struct adv_info {
> > #define HCI_MAX_ADV_INSTANCES 5
> > #define HCI_DEFAULT_ADV_DURATION 2
> >
> > +struct adv_pattern {
> > + struct list_head list;
> > + __u8 ad_type;
> > + __u8 offset;
> > + __u8 length;
> > + __u8 value[HCI_MAX_AD_LENGTH];
> > +};
> > +
> > +struct adv_monitor {
> > + struct list_head patterns;
> > + bool active;
> > + __u16 handle;
> > +};
> > +
> > +#define HCI_MIN_ADV_MONITOR_HANDLE 1
> > +#define HCI_MAX_ADV_MONITOR_NUM_HANDLES 32
> > +#define HCI_MAX_ADV_MONITOR_NUM_PATTERNS 16
> > +
> > #define HCI_MAX_SHORT_NAME_LENGTH 10
> >
> > /* Min encryption key size to match with SMP */
> > @@ -477,6 +496,9 @@ struct hci_dev {
> > __u16 adv_instance_timeout;
> > struct delayed_work adv_instance_expire;
> >
> > + struct idr adv_monitors_idr;
> > + unsigned int adv_monitors_cnt;
> > +
> > __u8 irk[16];
> > __u32 rpa_timeout;
> > struct delayed_work rpa_expired;
> > @@ -1217,6 +1239,8 @@ int hci_add_adv_instance(struct hci_dev *hdev, u8 instance, u32 flags,
> > int hci_remove_adv_instance(struct hci_dev *hdev, u8 instance);
> > void hci_adv_instances_set_rpa_expired(struct hci_dev *hdev, bool rpa_expired);
> >
> > +void hci_adv_monitors_clear(struct hci_dev *hdev);
> > +
> > void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb);
> >
> > void hci_init_sysfs(struct hci_dev *hdev);
> > diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> > index dbe2d79f233fb..23bfe4f1d1e9d 100644
> > --- a/net/bluetooth/hci_core.c
> > +++ b/net/bluetooth/hci_core.c
> > @@ -26,7 +26,6 @@
> > /* Bluetooth HCI core. */
> >
> > #include <linux/export.h>
> > -#include <linux/idr.h>
> > #include <linux/rfkill.h>
> > #include <linux/debugfs.h>
> > #include <linux/crypto.h>
> > @@ -2996,6 +2995,12 @@ int hci_add_adv_instance(struct hci_dev *hdev, u8 instance, u32 flags,
> > return 0;
> > }
> >
> > +/* This function requires the caller holds hdev->lock */
> > +void hci_adv_monitors_clear(struct hci_dev *hdev)
> > +{
> > + idr_destroy(&hdev->adv_monitors_idr);
> > +}
> > +
> > struct bdaddr_list *hci_bdaddr_list_lookup(struct list_head *bdaddr_list,
> > bdaddr_t *bdaddr, u8 type)
> > {
> > @@ -3574,6 +3579,8 @@ int hci_register_dev(struct hci_dev *hdev)
> >
> > queue_work(hdev->req_workqueue, &hdev->power_on);
> >
> > + idr_init(&hdev->adv_monitors_idr);
> > +
> > return id;
> >
> > err_wqueue:
> > @@ -3644,6 +3651,7 @@ void hci_unregister_dev(struct hci_dev *hdev)
> > hci_smp_irks_clear(hdev);
> > hci_remote_oob_data_clear(hdev);
> > hci_adv_instances_clear(hdev);
> > + hci_adv_monitors_clear(hdev);
> > hci_bdaddr_list_clear(&hdev->le_white_list);
> > hci_bdaddr_list_clear(&hdev->le_resolv_list);
> > hci_conn_params_clear_all(hdev);
> > diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> > index 9e8a3cccc6ca3..8d8275ee9718b 100644
> > --- a/net/bluetooth/mgmt.c
> > +++ b/net/bluetooth/mgmt.c
> > @@ -36,6 +36,7 @@
> > #include "hci_request.h"
> > #include "smp.h"
> > #include "mgmt_util.h"
> > +#include "msft.h"
> >
> > #define MGMT_VERSION 1
> > #define MGMT_REVISION 17
> > @@ -111,6 +112,7 @@ static const u16 mgmt_commands[] = {
> > MGMT_OP_READ_SECURITY_INFO,
> > MGMT_OP_READ_EXP_FEATURES_INFO,
> > MGMT_OP_SET_EXP_FEATURE,
> > + MGMT_OP_READ_ADV_MONITOR_FEATURES,
> > };
> >
> > static const u16 mgmt_events[] = {
> > @@ -3849,6 +3851,49 @@ static int set_exp_feature(struct sock *sk, struct hci_dev *hdev,
> > MGMT_STATUS_NOT_SUPPORTED);
> > }
> >
> > +static int read_adv_monitor_features(struct sock *sk, struct hci_dev *hdev,
> > + void *data, u16 len)
> > +{
> > + struct adv_monitor *monitor = NULL;
> > + struct mgmt_rp_read_adv_monitor_features *rp = NULL;
> > + int handle;
> > + size_t rp_size = 0;
> > + __u32 supported = 0;
> > + __u16 num_handles = 0;
> > + __u16 handles[HCI_MAX_ADV_MONITOR_NUM_HANDLES];
> > +
> > + BT_DBG("request for %s", hdev->name);
> > +
> > + hci_dev_lock(hdev);
> > +
> > + if (msft_get_features(hdev) & MSFT_FEATURE_MASK_LE_ADV_MONITOR)
> > + supported |= MGMT_ADV_MONITOR_FEATURE_MASK_OR_PATTERNS;
> > +
> > + idr_for_each_entry(&hdev->adv_monitors_idr, monitor, handle)
> > + handles[num_handles++] = monitor->handle;
>
> I would put { } here to make it readable.
>
> > +
> > + hci_dev_unlock(hdev);
> > +
> > + rp_size = sizeof(*rp) + (num_handles * sizeof(u16));
> > + rp = kmalloc(rp_size, GFP_KERNEL);
> > + if (!rp)
> > + return -ENOMEM;
> > +
> > + // Once controller-based monitoring is in place, the enabled_features
> > + // should reflect the use.
>
> Please use /* */ comment style here.
>
> > + rp->supported_features = supported;
> > + rp->enabled_features = 0;
> > + rp->max_num_handles = HCI_MAX_ADV_MONITOR_NUM_HANDLES;
> > + rp->max_num_patterns = HCI_MAX_ADV_MONITOR_NUM_PATTERNS;
>
> These are little-endian.
>
> > + rp->num_handles = num_handles;
> > + if (num_handles)
> > + memcpy(&rp->handles, &handles, (num_handles * sizeof(u16)));
> > +
> > + return mgmt_cmd_complete(sk, hdev->id,
> > + MGMT_OP_READ_ADV_MONITOR_FEATURES,
> > + MGMT_STATUS_SUCCESS, rp, rp_size);
> > +}
> > +
> > static void read_local_oob_data_complete(struct hci_dev *hdev, u8 status,
> > u16 opcode, struct sk_buff *skb)
> > {
> > @@ -7297,6 +7342,7 @@ static const struct hci_mgmt_handler mgmt_handlers[] = {
> > { set_exp_feature, MGMT_SET_EXP_FEATURE_SIZE,
> > HCI_MGMT_VAR_LEN |
> > HCI_MGMT_HDEV_OPTIONAL },
> > + { read_adv_monitor_features, MGMT_READ_ADV_MONITOR_FEATURES_SIZE },
> > };
> >
> > void mgmt_index_added(struct hci_dev *hdev)
> > diff --git a/net/bluetooth/msft.c b/net/bluetooth/msft.c
> > index d6c4e6b5ae777..8579bfeb28364 100644
> > --- a/net/bluetooth/msft.c
> > +++ b/net/bluetooth/msft.c
> > @@ -139,3 +139,10 @@ void msft_vendor_evt(struct hci_dev *hdev, struct sk_buff *skb)
> >
> > bt_dev_dbg(hdev, "MSFT vendor event %u", event);
> > }
> > +
> > +__u64 msft_get_features(struct hci_dev *hdev)
> > +{
> > + struct msft_data *msft = hdev->msft_data;
> > +
> > + return msft ? msft->features : 0;
> > +}
> > diff --git a/net/bluetooth/msft.h b/net/bluetooth/msft.h
> > index 5aa9130e1f8ab..e9c478e890b8b 100644
> > --- a/net/bluetooth/msft.h
> > +++ b/net/bluetooth/msft.h
> > @@ -3,16 +3,25 @@
> > * Copyright (C) 2020 Google Corporation
> > */
> >
> > +#define MSFT_FEATURE_MASK_BREDR_RSSI_MONITOR BIT(0)
> > +#define MSFT_FEATURE_MASK_LE_CONN_RSSI_MONITOR BIT(1)
> > +#define MSFT_FEATURE_MASK_LE_ADV_RSSI_MONITOR BIT(2)
> > +#define MSFT_FEATURE_MASK_LE_ADV_MONITOR BIT(3)
> > +#define MSFT_FEATURE_MASK_CURVE_VALIDITY BIT(4)
> > +#define MSFT_FEATURE_MASK_CONCURRENT_ADV_MONITOR BIT(5)
> > +
> > #if IS_ENABLED(CONFIG_BT_MSFTEXT)
> >
> > void msft_do_open(struct hci_dev *hdev);
> > void msft_do_close(struct hci_dev *hdev);
> > void msft_vendor_evt(struct hci_dev *hdev, struct sk_buff *skb);
> > +__u64 msft_get_features(struct hci_dev *hdev);
> >
> > #else
> >
> > static inline void msft_do_open(struct hci_dev *hdev) {}
> > static inline void msft_do_close(struct hci_dev *hdev) {}
> > static inline void msft_vendor_evt(struct hci_dev *hdev, struct sk_buff *skb) {}
> > +static inline __u64 msft_get_features(struct hci_dev *hdev) { return 0; }
>
> Regards
>
> Marcel
>

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