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Date: Sat, 5 Mar 2022 15:51:26 +0800
From: Joseph Hwang <josephsih@...gle.com>
To: Marcel Holtmann <marcel@...tmann.org>
Cc: BlueZ <linux-bluetooth@...r.kernel.org>,
Luiz Augusto von Dentz <luiz.dentz@...il.com>,
pali@...nel.org, chromeos-bluetooth-upstreaming@...omium.org,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Johan Hedberg <johan.hedberg@...il.com>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v4 3/3] Bluetooth: mgmt: add set_quality_report for MGMT_OP_SET_QUALITY_REPORT
Hi Marcel, thank you for reviewing the patches! I have some questions.
Please read my replies in the lines below. Thanks!
On Thu, Feb 17, 2022 at 9:04 PM Marcel Holtmann <marcel@...tmann.org> wrote:
>
> Hi Joseph,
>
> > This patch adds a new set_quality_report mgmt handler to set
> > the quality report feature. The feature is removed from the
> > experimental features at the same time.
> >
> > Signed-off-by: Joseph Hwang <josephsih@...omium.org>
> > ---
> >
> > Changes in v4:
> > - return current settings for set_quality_report.
> >
> > Changes in v3:
> > - This is a new patch to enable the quality report feature.
> > The reading and setting of the quality report feature are
> > removed from the experimental features.
> >
> > include/net/bluetooth/mgmt.h | 7 ++
> > net/bluetooth/mgmt.c | 168 +++++++++++++++--------------------
> > 2 files changed, 81 insertions(+), 94 deletions(-)
> >
> > diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
> > index 83b602636262..74d253ff617a 100644
> > --- a/include/net/bluetooth/mgmt.h
> > +++ b/include/net/bluetooth/mgmt.h
> > @@ -109,6 +109,7 @@ struct mgmt_rp_read_index_list {
> > #define MGMT_SETTING_STATIC_ADDRESS 0x00008000
> > #define MGMT_SETTING_PHY_CONFIGURATION 0x00010000
> > #define MGMT_SETTING_WIDEBAND_SPEECH 0x00020000
> > +#define MGMT_SETTING_QUALITY_REPORT 0x00040000
> >
> > #define MGMT_OP_READ_INFO 0x0004
> > #define MGMT_READ_INFO_SIZE 0
> > @@ -838,6 +839,12 @@ struct mgmt_cp_add_adv_patterns_monitor_rssi {
> > } __packed;
> > #define MGMT_ADD_ADV_PATTERNS_MONITOR_RSSI_SIZE 8
> >
> > +#define MGMT_OP_SET_QUALITY_REPORT 0x0057
> > +struct mgmt_cp_set_quality_report {
> > + __u8 action;
> > +} __packed;
> > +#define MGMT_SET_QUALITY_REPORT_SIZE 1
> > +
> > #define MGMT_EV_CMD_COMPLETE 0x0001
> > struct mgmt_ev_cmd_complete {
> > __le16 opcode;
> > diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> > index 5e48576041fb..ccd77b94905b 100644
> > --- a/net/bluetooth/mgmt.c
> > +++ b/net/bluetooth/mgmt.c
> > @@ -857,6 +857,10 @@ static u32 get_supported_settings(struct hci_dev *hdev)
> >
> > settings |= MGMT_SETTING_PHY_CONFIGURATION;
> >
> > + if (hdev && (aosp_has_quality_report(hdev) ||
> > + hdev->set_quality_report))
> > + settings |= MGMT_SETTING_QUALITY_REPORT;
> > +
>
> the hdev check here is useless. The hdev structure is always valid.
>
> > return settings;
> > }
> >
> > @@ -928,6 +932,9 @@ static u32 get_current_settings(struct hci_dev *hdev)
> > if (hci_dev_test_flag(hdev, HCI_WIDEBAND_SPEECH_ENABLED))
> > settings |= MGMT_SETTING_WIDEBAND_SPEECH;
> >
> > + if (hci_dev_test_flag(hdev, HCI_QUALITY_REPORT))
> > + settings |= MGMT_SETTING_QUALITY_REPORT;
> > +
> > return settings;
> > }
> >
> > @@ -3871,12 +3878,6 @@ static const u8 debug_uuid[16] = {
> > };
> > #endif
> >
> > -/* 330859bc-7506-492d-9370-9a6f0614037f */
> > -static const u8 quality_report_uuid[16] = {
> > - 0x7f, 0x03, 0x14, 0x06, 0x6f, 0x9a, 0x70, 0x93,
> > - 0x2d, 0x49, 0x06, 0x75, 0xbc, 0x59, 0x08, 0x33,
> > -};
> > -
> > /* a6695ace-ee7f-4fb9-881a-5fac66c629af */
> > static const u8 offload_codecs_uuid[16] = {
> > 0xaf, 0x29, 0xc6, 0x66, 0xac, 0x5f, 0x1a, 0x88,
> > @@ -3898,7 +3899,7 @@ static const u8 rpa_resolution_uuid[16] = {
> > static int read_exp_features_info(struct sock *sk, struct hci_dev *hdev,
> > void *data, u16 data_len)
> > {
> > - char buf[102]; /* Enough space for 5 features: 2 + 20 * 5 */
> > + char buf[82]; /* Enough space for 4 features: 2 + 20 * 4 */
> > struct mgmt_rp_read_exp_features_info *rp = (void *)buf;
> > u16 idx = 0;
> > u32 flags;
> > @@ -3939,18 +3940,6 @@ static int read_exp_features_info(struct sock *sk, struct hci_dev *hdev,
> > idx++;
> > }
> >
> > - if (hdev && (aosp_has_quality_report(hdev) ||
> > - hdev->set_quality_report)) {
> > - if (hci_dev_test_flag(hdev, HCI_QUALITY_REPORT))
> > - flags = BIT(0);
> > - else
> > - flags = 0;
> > -
> > - memcpy(rp->features[idx].uuid, quality_report_uuid, 16);
> > - rp->features[idx].flags = cpu_to_le32(flags);
> > - idx++;
> > - }
> > -
>
> (I see, you copied it from here. Yes, here you need to check for hdev!)
>
> > if (hdev && hdev->get_data_path_id) {
> > if (hci_dev_test_flag(hdev, HCI_OFFLOAD_CODECS_ENABLED))
> > flags = BIT(0);
> > @@ -4163,80 +4152,6 @@ static int set_rpa_resolution_func(struct sock *sk, struct hci_dev *hdev,
> > return err;
> > }
> >
> > -static int set_quality_report_func(struct sock *sk, struct hci_dev *hdev,
> > - struct mgmt_cp_set_exp_feature *cp,
> > - u16 data_len)
> > -{
> > - struct mgmt_rp_set_exp_feature rp;
> > - bool val, changed;
> > - int err;
> > -
> > - /* Command requires to use a valid controller index */
> > - if (!hdev)
> > - return mgmt_cmd_status(sk, MGMT_INDEX_NONE,
> > - MGMT_OP_SET_EXP_FEATURE,
> > - MGMT_STATUS_INVALID_INDEX);
> > -
> > - /* Parameters are limited to a single octet */
> > - if (data_len != MGMT_SET_EXP_FEATURE_SIZE + 1)
> > - return mgmt_cmd_status(sk, hdev->id,
> > - MGMT_OP_SET_EXP_FEATURE,
> > - MGMT_STATUS_INVALID_PARAMS);
> > -
> > - /* Only boolean on/off is supported */
> > - if (cp->param[0] != 0x00 && cp->param[0] != 0x01)
> > - return mgmt_cmd_status(sk, hdev->id,
> > - MGMT_OP_SET_EXP_FEATURE,
> > - MGMT_STATUS_INVALID_PARAMS);
> > -
> > - hci_req_sync_lock(hdev);
> > -
> > - val = !!cp->param[0];
> > - changed = (val != hci_dev_test_flag(hdev, HCI_QUALITY_REPORT));
> > -
> > - if (!aosp_has_quality_report(hdev) && !hdev->set_quality_report) {
> > - err = mgmt_cmd_status(sk, hdev->id,
> > - MGMT_OP_SET_EXP_FEATURE,
> > - MGMT_STATUS_NOT_SUPPORTED);
> > - goto unlock_quality_report;
> > - }
> > -
> > - if (changed) {
> > - if (hdev->set_quality_report)
> > - err = hdev->set_quality_report(hdev, val);
> > - else
> > - err = aosp_set_quality_report(hdev, val);
> > -
> > - if (err) {
> > - err = mgmt_cmd_status(sk, hdev->id,
> > - MGMT_OP_SET_EXP_FEATURE,
> > - MGMT_STATUS_FAILED);
> > - goto unlock_quality_report;
> > - }
> > -
> > - if (val)
> > - hci_dev_set_flag(hdev, HCI_QUALITY_REPORT);
> > - else
> > - hci_dev_clear_flag(hdev, HCI_QUALITY_REPORT);
> > - }
> > -
> > - bt_dev_dbg(hdev, "quality report enable %d changed %d", val, changed);
> > -
> > - memcpy(rp.uuid, quality_report_uuid, 16);
> > - rp.flags = cpu_to_le32(val ? BIT(0) : 0);
> > - hci_sock_set_flag(sk, HCI_MGMT_EXP_FEATURE_EVENTS);
> > -
> > - err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_SET_EXP_FEATURE, 0,
> > - &rp, sizeof(rp));
> > -
> > - if (changed)
> > - exp_feature_changed(hdev, quality_report_uuid, val, sk);
> > -
> > -unlock_quality_report:
> > - hci_req_sync_unlock(hdev);
> > - return err;
> > -}
> > -
> > static int set_offload_codec_func(struct sock *sk, struct hci_dev *hdev,
> > struct mgmt_cp_set_exp_feature *cp,
> > u16 data_len)
> > @@ -4363,7 +4278,6 @@ static const struct mgmt_exp_feature {
> > EXP_FEAT(debug_uuid, set_debug_func),
> > #endif
> > EXP_FEAT(rpa_resolution_uuid, set_rpa_resolution_func),
> > - EXP_FEAT(quality_report_uuid, set_quality_report_func),
> > EXP_FEAT(offload_codecs_uuid, set_offload_codec_func),
> > EXP_FEAT(le_simultaneous_roles_uuid, set_le_simultaneous_roles_func),
> >
> > @@ -8653,6 +8567,71 @@ static int get_adv_size_info(struct sock *sk, struct hci_dev *hdev,
> > MGMT_STATUS_SUCCESS, &rp, sizeof(rp));
> > }
> >
> > +static int set_quality_report(struct sock *sk, struct hci_dev *hdev,
> > + void *data, u16 data_len)
> > +{
> > + struct mgmt_cp_set_quality_report *cp = data;
> > + bool enable, changed;
> > + int err;
> > +
> > + /* Command requires to use a valid controller index */
> > + if (!hdev)
> > + return mgmt_cmd_status(sk, MGMT_INDEX_NONE,
> > + MGMT_OP_SET_QUALITY_REPORT,
> > + MGMT_STATUS_INVALID_INDEX);
> > +
> > + /* Only 0 (off) and 1 (on) is supported */
> > + if (cp->action != 0x00 && cp->action != 0x01)
> > + return mgmt_cmd_status(sk, hdev->id,
> > + MGMT_OP_SET_QUALITY_REPORT,
> > + MGMT_STATUS_INVALID_PARAMS);
> > +
> > + hci_req_sync_lock(hdev);
> > +
> > + enable = !!cp->action;
> > + changed = (enable != hci_dev_test_flag(hdev, HCI_QUALITY_REPORT));
> > +
> > + if (!aosp_has_quality_report(hdev) && !hdev->set_quality_report) {
> > + err = mgmt_cmd_status(sk, hdev->id,
> > + MGMT_OP_SET_QUALITY_REPORT,
> > + MGMT_STATUS_NOT_SUPPORTED);
> > + goto unlock_quality_report;
> > + }
> > +
> > + if (changed) {
> > + if (hdev->set_quality_report)
> > + err = hdev->set_quality_report(hdev, enable);
> > + else
> > + err = aosp_set_quality_report(hdev, enable);
> > +
> > + if (err) {
> > + err = mgmt_cmd_status(sk, hdev->id,
> > + MGMT_OP_SET_QUALITY_REPORT,
> > + MGMT_STATUS_FAILED);
> > + goto unlock_quality_report;
> > + }
> > +
> > + if (enable)
> > + hci_dev_set_flag(hdev, HCI_QUALITY_REPORT);
> > + else
> > + hci_dev_clear_flag(hdev, HCI_QUALITY_REPORT);
> > + }
> > +
> > + bt_dev_dbg(hdev, "quality report enable %d changed %d",
> > + enable, changed);
> > +
> > + err = send_settings_rsp(sk, MGMT_OP_SET_QUALITY_REPORT, hdev);
> > + if (err < 0)
> > + goto unlock_quality_report;
> > +
> > + if (changed)
> > + err = new_settings(hdev, sk);
> > +
> > +unlock_quality_report:
> > + hci_req_sync_unlock(hdev);
> > + return err;
> > +}
> > +
> > static const struct hci_mgmt_handler mgmt_handlers[] = {
> > { NULL }, /* 0x0000 (no command) */
> > { read_version, MGMT_READ_VERSION_SIZE,
> > @@ -8779,6 +8758,7 @@ static const struct hci_mgmt_handler mgmt_handlers[] = {
> > { add_adv_patterns_monitor_rssi,
> > MGMT_ADD_ADV_PATTERNS_MONITOR_RSSI_SIZE,
> > HCI_MGMT_VAR_LEN },
> > + { set_quality_report, MGMT_SET_QUALITY_REPORT_SIZE },
> > };
> >
> > void mgmt_index_added(struct hci_dev *hdev)
>
> So this patch I actually get merged first.
I do not see this patch getting merged yet. I guess I still need to
remove the “hdev” that you mentioned above and re-submit this patch?
>
> However we still need to figure out if this setting is suppose to survive power off/on cycles. Right now as far as I can tell it is added to hci_dev_clear_volatile_flags and thus needs to be set again after power on.
Thank you for pointing this out. Whether the setting should survive
power off/on cycles is not mentioned in the AOSP BQR and Intel
telemetry specifications. I did a quick test on an Intel platform, the
setting does NOT survive over power cycles probably due to the HCI
Reset command during power off. Hence, I will need to address this
issue by restoring it explicitly. Please let me send separate patches
later to address this issue for both Intel and AOSP specs.
>
> Is this the expected behavior? I don’t think we want that. Since normally all other settings are restored after power on. And it is explicitly mentioned in doc/mgmt-api.txt as well.
I will mention this in the Set Powered Command in doc/mgmt-api.txt in
the separate patches later.
>
> Regards
>
> Marcel
>
>
--
Joseph Shyh-In Hwang
Email: josephsih@...gle.com
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