Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Joseph Hwang <josephsih@chromium.org>
To:     linux-bluetooth@vger.kernel.org, marcel@holtmann.org,
        luiz.dentz@gmail.com, pali@kernel.org
Cc:     chromeos-bluetooth-upstreaming@chromium.org, josephsih@google.com,
        Joseph Hwang <josephsih@chromium.org>,
        Archie Pusaka <apusaka@chromium.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Johan Hedberg <johan.hedberg@gmail.com>,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH v1 1/2] Bluetooth: aosp: surface AOSP quality report through mgmt
Date:   Fri, 21 Jan 2022 19:22:32 +0800
Message-Id: <20220121192152.v1.1.I2015b42d2d0a502334c9c3a2983438b89716d4f0@changeid>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

When receiving a HCI vendor event, the kernel checks if it is an
AOSP bluetooth quality report. If yes, the event is sent to bluez
user space through the mgmt socket.

Signed-off-by: Joseph Hwang <josephsih@chromium.org>
Reviewed-by: Archie Pusaka <apusaka@chromium.org>
---

 include/net/bluetooth/hci_core.h |  2 ++
 include/net/bluetooth/mgmt.h     |  7 ++++
 net/bluetooth/aosp.c             | 61 ++++++++++++++++++++++++++++++++
 net/bluetooth/aosp.h             | 12 +++++++
 net/bluetooth/hci_event.c        | 33 ++++++++++++++++-
 net/bluetooth/mgmt.c             | 22 ++++++++++++
 6 files changed, 136 insertions(+), 1 deletion(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 21eadb113a31..727cb9c056b2 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1861,6 +1861,8 @@ int mgmt_add_adv_patterns_monitor_complete(struct hci_dev *hdev, u8 status);
 int mgmt_remove_adv_monitor_complete(struct hci_dev *hdev, u8 status);
 void mgmt_adv_monitor_device_lost(struct hci_dev *hdev, u16 handle,
 				  bdaddr_t *bdaddr, u8 addr_type);
+int mgmt_quality_report(struct hci_dev *hdev, struct sk_buff *skb,
+			u8 quality_spec);
 
 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
 		      u16 to_multiplier);
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index 99266f7aebdc..6a0fcb3aef8a 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -1120,3 +1120,10 @@ struct mgmt_ev_adv_monitor_device_lost {
 	__le16 monitor_handle;
 	struct mgmt_addr_info addr;
 } __packed;
+
+#define MGMT_EV_QUALITY_REPORT			0x0031
+struct mgmt_ev_quality_report {
+	__u8 quality_spec;
+	__u8 data_len;
+	__u8 data[0];
+} __packed;
diff --git a/net/bluetooth/aosp.c b/net/bluetooth/aosp.c
index 432ae3aac9e3..9e3551627ad5 100644
--- a/net/bluetooth/aosp.c
+++ b/net/bluetooth/aosp.c
@@ -199,3 +199,64 @@ int aosp_set_quality_report(struct hci_dev *hdev, bool enable)
 	else
 		return disable_quality_report(hdev);
 }
+
+#define BLUETOOTH_QUALITY_REPORT_EV		0x58
+struct bqr_data {
+	__u8 quality_report_id;
+	__u8 packet_type;
+	__le16 conn_handle;
+	__u8 conn_role;
+	__s8 tx_power_level;
+	__s8 rssi;
+	__u8 snr;
+	__u8 unused_afh_channel_count;
+	__u8 afh_select_unideal_channel_count;
+	__le16 lsto;
+	__le32 conn_piconet_clock;
+	__le32 retransmission_count;
+	__le32 no_rx_count;
+	__le32 nak_count;
+	__le32 last_tx_ack_timestamp;
+	__le32 flow_off_count;
+	__le32 last_flow_on_timestamp;
+	__le32 buffer_overflow_bytes;
+	__le32 buffer_underflow_bytes;
+
+	/* Vendor Specific Parameter */
+	__u8 vsp[0];
+} __packed;
+
+struct aosp_hci_vs_data {
+	__u8 code;
+	__u8 data[0];
+} __packed;
+
+bool aosp_is_quality_report_evt(struct sk_buff *skb)
+{
+	struct aosp_hci_vs_data *ev;
+
+	if (skb->len < sizeof(struct aosp_hci_vs_data))
+		return false;
+
+	ev = (struct aosp_hci_vs_data *)skb->data;
+
+	return ev->code == BLUETOOTH_QUALITY_REPORT_EV;
+}
+
+bool aosp_pull_quality_report_data(struct sk_buff *skb)
+{
+	size_t bqr_data_len = sizeof(struct bqr_data);
+
+	skb_pull(skb, sizeof(struct aosp_hci_vs_data));
+
+	/* skb->len is allowed to be larger than bqr_data_len to have
+	 * the Vendor Specific Parameter (vsp) field.
+	 */
+	if (skb->len < bqr_data_len) {
+		BT_ERR("AOSP evt data len %d too short (%u expected)",
+		       skb->len, bqr_data_len);
+		return false;
+	}
+
+	return true;
+}
diff --git a/net/bluetooth/aosp.h b/net/bluetooth/aosp.h
index 2fd8886d51b2..49894a995647 100644
--- a/net/bluetooth/aosp.h
+++ b/net/bluetooth/aosp.h
@@ -10,6 +10,8 @@ void aosp_do_close(struct hci_dev *hdev);
 
 bool aosp_has_quality_report(struct hci_dev *hdev);
 int aosp_set_quality_report(struct hci_dev *hdev, bool enable);
+bool aosp_is_quality_report_evt(struct sk_buff *skb);
+bool aosp_pull_quality_report_data(struct sk_buff *skb);
 
 #else
 
@@ -26,4 +28,14 @@ static inline int aosp_set_quality_report(struct hci_dev *hdev, bool enable)
 	return -EOPNOTSUPP;
 }
 
+static inline bool aosp_is_quality_report_evt(struct sk_buff *skb)
+{
+	return false;
+}
+
+static inline bool aosp_pull_quality_report_data(struct sk_buff *skb)
+{
+	return false;
+}
+
 #endif
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 681c623aa380..bccb659a9454 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -37,6 +37,7 @@
 #include "smp.h"
 #include "msft.h"
 #include "eir.h"
+#include "aosp.h"
 
 #define ZERO_KEY "\x00\x00\x00\x00\x00\x00\x00\x00" \
 		 "\x00\x00\x00\x00\x00\x00\x00\x00"
@@ -4225,6 +4226,36 @@ static void hci_num_comp_blocks_evt(struct hci_dev *hdev, void *data,
 	queue_work(hdev->workqueue, &hdev->tx_work);
 }
 
+#define QUALITY_SPEC_NA			0x0
+#define QUALITY_SPEC_INTEL_TELEMETRY	0x1
+#define QUALITY_SPEC_AOSP_BQR		0x2
+
+static bool quality_report_evt(struct hci_dev *hdev,  void *data,
+			       struct sk_buff *skb)
+{
+	if (aosp_is_quality_report_evt(skb)) {
+		if (aosp_has_quality_report(hdev) &&
+		    aosp_pull_quality_report_data(skb))
+			mgmt_quality_report(hdev, skb, QUALITY_SPEC_AOSP_BQR);
+
+		return true;
+	}
+
+	return false;
+}
+
+static void hci_vendor_evt(struct hci_dev *hdev, void *data,
+			   struct sk_buff *skb)
+{
+	/* Every distinct vendor specification must have a well-defined
+	 * condition to determine if an event meets the specification.
+	 * The skb is consumed by a specification only if the event meets
+	 * the specification.
+	 */
+	if (!quality_report_evt(hdev, data, skb))
+		msft_vendor_evt(hdev, data, skb);
+}
+
 static void hci_mode_change_evt(struct hci_dev *hdev, void *data,
 				struct sk_buff *skb)
 {
@@ -6811,7 +6842,7 @@ static const struct hci_ev {
 	HCI_EV(HCI_EV_NUM_COMP_BLOCKS, hci_num_comp_blocks_evt,
 	       sizeof(struct hci_ev_num_comp_blocks)),
 	/* [0xff = HCI_EV_VENDOR] */
-	HCI_EV(HCI_EV_VENDOR, msft_vendor_evt, 0),
+	HCI_EV(HCI_EV_VENDOR, hci_vendor_evt, 0),
 };
 
 static void hci_event_func(struct hci_dev *hdev, u8 event, struct sk_buff *skb,
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 08d6494f1b34..78687ae885be 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -4389,6 +4389,28 @@ static int set_exp_feature(struct sock *sk, struct hci_dev *hdev,
 			       MGMT_STATUS_NOT_SUPPORTED);
 }
 
+int mgmt_quality_report(struct hci_dev *hdev, struct sk_buff *skb,
+			u8 quality_spec)
+{
+	struct mgmt_ev_quality_report *ev;
+	size_t ev_len;
+	int err;
+
+	/* The ev comes with a variable-length data field. */
+	ev_len = sizeof(*ev) + skb->len;
+	ev = kmalloc(ev_len, GFP_KERNEL);
+	if (!ev)
+		return -ENOMEM;
+
+	ev->quality_spec = quality_spec;
+	ev->data_len = skb->len;
+	memcpy(ev->data, skb->data, skb->len);
+	err = mgmt_event(MGMT_EV_QUALITY_REPORT, hdev, ev, ev_len, NULL);
+	kfree(ev);
+
+	return err;
+}
+
 static int get_device_flags(struct sock *sk, struct hci_dev *hdev, void *data,
 			    u16 data_len)
 {
-- 
2.35.0.rc0.227.g00780c9af4-goog