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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date:   Wed, 14 Jul 2021 15:21:49 -0700
Message-ID: <CABBYNZJ5YHCSiE+-oLHgS0OV2GVxKgQi1c+QxRaJxxbL3+k3hA@mail.gmail.com>
Subject: Re: [BlueZ PATCH v5 1/3] monitor: add new Intel extended telemetry events
To:     Joseph Hwang <josephsih@google.com>
Cc:     "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>,
        Marcel Holtmann <marcel@holtmann.org>,
        =?UTF-8?Q?Pali_Roh=C3=A1r?= <pali@kernel.org>,
        ChromeOS Bluetooth Upstreaming 
        <chromeos-bluetooth-upstreaming@chromium.org>,
        Miao-chen Chou <mcchou@chromium.org>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Hi Joseph,

On Mon, Jul 12, 2021 at 7:08 PM Joseph Hwang <josephsih@google.com> wrote:
>
> Hi Luiz:
>
>   A gentle ping for a re-review on the new changes per your previous comments.

Ive left comments to patch 2/3 and 3/3 that still haven't been addressed:

2/3: We need to new UUID to be added to util.c like the rest of
experimental UUIDs:
https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/src/shared/util.c#n1023

3/3: Instead of having a function that doesn't seem to be used
anywhere it would probably be easier to enable whenever
btd_opts.experimental is enable e.g.:
https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/src/adapter.c#n9293

> Thanks and best regards,
> Joseph
>
>
> On Tue, Jun 29, 2021 at 3:47 PM Joseph Hwang <josephsih@chromium.org> wrote:
> >
> > This patch adds new Intel extended telemetry events for both ACL and
> > SCO/eSCO audio link quality reports.
> >
> > For SCO/eSCO audio link quality report, it shows something like
> > > HCI Event: Vendor (0xff) plen 190  #120 [hci0] 2021-05-31 20:27:50.257
> >         Vendor Prefix (0x8780)
> >       Intel Extended Telemetry (0x87)
> >         Extended Telemetry (0x80): SubOpcode (0x03)
> >         Extended event type (0x01): Audio Link Quality Report Type(0x05)
> >         SCO/eSCO connection handle (0x6a): 0x0101
> >         Packets from host (0x6b): 399
> >         Tx packets (0x6c): 403
> >         Rx payload lost (0x6d): 3
> >         Tx payload lost (0x6e): 0
> >         Rx No SYNC errors (0x6f): 3 2 3 3 0
> >         Rx HEC errors (0x70): 0 0 0 0 0
> >         Rx CRC errors (0x71): 2 0 0 0 0
> >         Rx NAK errors (0x72): 6 0 0 0 0
> >         Failed Tx due to Wifi coex (0x73): 6 0 0 0 0
> >         Failed Rx due to Wifi coex (0x74): 0 0 0 0 0
> >         Late samples inserted based on CDC (0x75): 0
> >         Samples dropped (0x76): 0
> >         Mute samples sent at initial connection (0x77): 0
> >         PLC injection data (0x78): 0
> >
> > For ACL audio link quality report, it shows something like
> > > HCI Event: Vendor (0xff) plen 142  #120 [hci0] 2021-05-31 20:27:50.261
> >         Vendor Prefix (0x8780)
> >       Intel Extended Telemetry (0x87)
> >         Extended Telemetry (0x80): SubOpcode (0x03)
> >         Extended event type (0x01): Audio Link Quality Report Type(0x05)
> >         ACL connection handle (0x4a): 0x0100
> >         Rx HEC errors (0x4b): 0
> >         Rx CRC errors (0x4c): 0
> >         Packets from host (0x4d): 100
> >         Tx packets (0x4e): 101
> >         Tx packets 0 retries (0x4f): 89
> >         Tx packets 1 retries (0x50): 11
> >         Tx packets 2 retries (0x51): 1
> >         Tx packets 3 retries (0x52): 0
> >         Tx packets 4 retries and more (0x53): 0
> >         Tx DH1 packets (0x54): 0
> >         Tx DH3 packets (0x55): 0
> >         Tx DH5 packets (0x56): 0
> >         Tx 2DH1 packets (0x57): 0
> >         Tx 2DH3 packets (0x58): 0
> >         Tx 2DH5 packets (0x59): 0
> >         Tx 3DH1 packets (0x5a): 6
> >         Tx 3DH3 packets (0x5b): 0
> >         Tx 3DH5 packets (0x5c): 94
> >         Rx packets (0x5d): 272
> >         ACL link throughput (KBps) (0x5e): 343815
> >         ACL max packet latency (ms) (0x5f): 20625
> >         ACL avg packet latency (ms) (0x60): 12
> >
> > Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
> > ---
> >
> > Changes in v5:
> > - Fix two Make errors.
> > - Please also review Series-changes 3.
> >
> > Changes in v4:
> > - Fix a Make error.
> > - Please also review Series-changes 3.
> >
> > Changes in v3:
> > - Define the packed struct intel_ext_evt for the extended telemetry
> >   event.
> > - Define the packed struct intel_tlv for the telemetry subevent.
> > - Define a new function intel_vendor_prefix_evt() to handle the new
> >   vendor event type with a vendor prefix
> >       0xff <length> <vendor_prefix> <subopcode> <data>
> >   while intel_vendor_evt() handles the original vendor event type
> >       0xff <length> <subopcode> <data>
> > - Add the vendor_prefix_evt_table table so that more subopcodes can be
> >   added for the events with a vendor prefix.
> > - Move the event data buffer check after processing the current tlv.
> > - Fix typos.
> >
> > Changes in v2:
> > - Perform size checks for tlv subevents.
> > - Fix the Make errors about qualifiers.
> >
> >  monitor/intel.c  | 492 ++++++++++++++++++++++++++++++++++++++++++++++-
> >  monitor/intel.h  |   2 +-
> >  monitor/packet.c |  18 +-
> >  3 files changed, 503 insertions(+), 9 deletions(-)
> >
> > diff --git a/monitor/intel.c b/monitor/intel.c
> > index d2aefa6a8..7591df4ee 100644
> > --- a/monitor/intel.c
> > +++ b/monitor/intel.c
> > @@ -30,6 +30,7 @@
> >
> >  #define COLOR_UNKNOWN_EVENT_MASK       COLOR_WHITE_BG
> >  #define COLOR_UNKNOWN_SCAN_STATUS      COLOR_WHITE_BG
> > +#define COLOR_UNKNOWN_EXT_EVENT                COLOR_WHITE_BG
> >
> >  static void print_status(uint8_t status)
> >  {
> > @@ -992,14 +993,501 @@ static const struct vendor_evt vendor_evt_table[] = {
> >         { }
> >  };
> >
> > -const struct vendor_evt *intel_vendor_evt(uint8_t evt)
> > +/*
> > + * An Intel telemetry subevent is of the TLV format.
> > + * - Type: takes 1 byte. This is the subevent_id.
> > + * - Length: takes 1 byte.
> > + * - Value: takes |Length| bytes.
> > + */
> > +struct intel_tlv {
> > +       uint8_t subevent_id;
> > +       uint8_t length;
> > +       uint8_t value[];
> > +};
> > +
> > +#define TLV_SIZE(tlv) (*((const uint8_t *) tlv + 1) + 2 * sizeof(uint8_t))
> > +#define NEXT_TLV(tlv) (const struct intel_tlv *) \
> > +                                       ((const uint8_t *) tlv + TLV_SIZE(tlv))
> > +
> > +static void ext_evt_type(const struct intel_tlv *tlv)
> > +{
> > +       uint8_t evt_type = get_u8(tlv->value);
> > +       const char *str;
> > +
> > +       switch (evt_type) {
> > +       case 0x00:
> > +               str = "System Exception";
> > +               break;
> > +       case 0x01:
> > +               str = "Fatal Exception";
> > +               break;
> > +       case 0x02:
> > +               str = "Debug Exception";
> > +               break;
> > +       case 0x03:
> > +               str = "Connection Event for BR/EDR Link Type";
> > +               break;
> > +       case 0x04:
> > +               str = "Disconnection Event";
> > +               break;
> > +       case 0x05:
> > +               str = "Audio Link Quality Report Type";
> > +               break;
> > +       case 0x06:
> > +               str = "Stats for BR/EDR Link Type";
> > +               break;
> > +       default:
> > +               print_text(COLOR_UNKNOWN_EXT_EVENT,
> > +                       "Unknown extended telemetry event type (0x%2.2x)",
> > +                       evt_type);
> > +               packet_hexdump((const void *) tlv,
> > +                                       tlv->length + 2 * sizeof(uint8_t));
> > +               return;
> > +       }
> > +
> > +       print_field("Extended event type (0x%2.2x): %s (0x%2.2x)",
> > +                       tlv->subevent_id, str, evt_type);
> > +}
> > +
> > +static void ext_acl_evt_conn_handle(const struct intel_tlv *tlv)
> > +{
> > +       uint16_t conn_handle = get_le16(tlv->value);
> > +
> > +       print_field("ACL connection handle (0x%2.2x): 0x%4.4x",
> > +                       tlv->subevent_id, conn_handle);
> > +}
> > +
> > +static void ext_acl_evt_hec_errors(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Rx HEC errors (0x%2.2x): %d", tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_acl_evt_crc_errors(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Rx CRC errors (0x%2.2x): %d", tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_acl_evt_num_pkt_from_host(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Packets from host (0x%2.2x): %d",
> > +                       tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_acl_evt_num_tx_pkt_to_air(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Tx packets (0x%2.2x): %d", tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_acl_evt_num_tx_pkt_retry(const struct intel_tlv *tlv)
> > +{
> > +       char *subevent_str;
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       switch (tlv->subevent_id) {
> > +       case 0x4f:
> > +               subevent_str = "Tx packets 0 retries";
> > +               break;
> > +       case 0x50:
> > +               subevent_str = "Tx packets 1 retries";
> > +               break;
> > +       case 0x51:
> > +               subevent_str = "Tx packets 2 retries";
> > +               break;
> > +       case 0x52:
> > +               subevent_str = "Tx packets 3 retries";
> > +               break;
> > +       case 0x53:
> > +               subevent_str = "Tx packets 4 retries and more";
> > +               break;
> > +       default:
> > +               subevent_str = "Unknown";
> > +               break;
> > +       }
> > +
> > +       print_field("%s (0x%2.2x): %d", subevent_str, tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_acl_evt_num_tx_pkt_type(const struct intel_tlv *tlv)
> > +{
> > +       char *packet_type_str;
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       switch (tlv->subevent_id) {
> > +       case 0x54:
> > +               packet_type_str = "DH1";
> > +               break;
> > +       case 0x55:
> > +               packet_type_str = "DH3";
> > +               break;
> > +       case 0x56:
> > +               packet_type_str = "DH5";
> > +               break;
> > +       case 0x57:
> > +               packet_type_str = "2DH1";
> > +               break;
> > +       case 0x58:
> > +               packet_type_str = "2DH3";
> > +               break;
> > +       case 0x59:
> > +               packet_type_str = "2DH5";
> > +               break;
> > +       case 0x5a:
> > +               packet_type_str = "3DH1";
> > +               break;
> > +       case 0x5b:
> > +               packet_type_str = "3DH3";
> > +               break;
> > +       case 0x5c:
> > +               packet_type_str = "3DH5";
> > +               break;
> > +       default:
> > +               packet_type_str = "Unknown";
> > +               break;
> > +       }
> > +
> > +       print_field("Tx %s packets (0x%2.2x): %d",
> > +                       packet_type_str, tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_acl_evt_num_rx_pkt_from_air(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Rx packets (0x%2.2x): %d",
> > +                       tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_acl_evt_link_throughput(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("ACL link throughput (KBps) (0x%2.2x): %d",
> > +                       tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_acl_evt_max_packet_latency(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("ACL max packet latency (ms) (0x%2.2x): %d",
> > +                       tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_acl_evt_avg_packet_latency(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("ACL avg packet latency (ms) (0x%2.2x): %d",
> > +                       tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_sco_evt_conn_handle(const struct intel_tlv *tlv)
> > +{
> > +       uint16_t conn_handle = get_le16(tlv->value);
> > +
> > +       print_field("SCO/eSCO connection handle (0x%2.2x): 0x%4.4x",
> > +                       tlv->subevent_id, conn_handle);
> > +}
> > +
> > +static void ext_sco_evt_num_rx_pkt_from_air(const struct intel_tlv *tlv)
> >  {
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Packets from host (0x%2.2x): %d", tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_sco_evt_num_tx_pkt_to_air(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Tx packets (0x%2.2x): %d", tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_sco_evt_num_rx_payloads_lost(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Rx payload lost (0x%2.2x): %d", tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_sco_evt_num_tx_payloads_lost(const struct intel_tlv *tlv)
> > +{
> > +
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Tx payload lost (0x%2.2x): %d", tlv->subevent_id, num);
> > +}
> > +
> > +static void slots_errors(const struct intel_tlv *tlv, const char *type_str)
> > +{
> > +       /* The subevent has 5 slots where each slot is of the uint32_t type. */
> > +       uint32_t num[5];
> > +       const uint8_t *data = tlv->value;
> > +       int i;
> > +
> > +       if (tlv->length != 5 * sizeof(uint32_t)) {
> > +               print_text(COLOR_UNKNOWN_EXT_EVENT,
> > +                               "  Invalid subevent length (%d)", tlv->length);
> > +               return;
> > +       }
> > +
> > +       for (i = 0; i < 5; i++) {
> > +               num[i] = get_le32(data);
> > +               data += sizeof(uint32_t);
> > +       }
> > +
> > +       print_field("%s (0x%2.2x): %d %d %d %d %d", type_str, tlv->subevent_id,
> > +                       num[0], num[1], num[2], num[3], num[4]);
> > +}
> > +
> > +static void ext_sco_evt_num_no_sync_errors(const struct intel_tlv *tlv)
> > +{
> > +       slots_errors(tlv, "Rx No SYNC errors");
> > +}
> > +
> > +static void ext_sco_evt_num_hec_errors(const struct intel_tlv *tlv)
> > +{
> > +       slots_errors(tlv, "Rx HEC errors");
> > +}
> > +
> > +static void ext_sco_evt_num_crc_errors(const struct intel_tlv *tlv)
> > +{
> > +       slots_errors(tlv, "Rx CRC errors");
> > +}
> > +
> > +static void ext_sco_evt_num_naks(const struct intel_tlv *tlv)
> > +{
> > +       slots_errors(tlv, "Rx NAK errors");
> > +}
> > +
> > +static void ext_sco_evt_num_failed_tx_by_wifi(const struct intel_tlv *tlv)
> > +{
> > +       slots_errors(tlv, "Failed Tx due to Wifi coex");
> > +}
> > +
> > +static void ext_sco_evt_num_failed_rx_by_wifi(const struct intel_tlv *tlv)
> > +{
> > +       slots_errors(tlv, "Failed Rx due to Wifi coex");
> > +}
> > +
> > +static void ext_sco_evt_samples_inserted(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Late samples inserted based on CDC (0x%2.2x): %d",
> > +                       tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_sco_evt_samples_dropped(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Samples dropped (0x%2.2x): %d", tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_sco_evt_mute_samples(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("Mute samples sent at initial connection (0x%2.2x): %d",
> > +                       tlv->subevent_id, num);
> > +}
> > +
> > +static void ext_sco_evt_plc_injection_data(const struct intel_tlv *tlv)
> > +{
> > +       uint32_t num = get_le32(tlv->value);
> > +
> > +       print_field("PLC injection data (0x%2.2x): %d", tlv->subevent_id, num);
> > +}
> > +
> > +static const struct intel_ext_subevent {
> > +       uint8_t subevent_id;
> > +       uint8_t length;
> > +       void (*func)(const struct intel_tlv *tlv);
> > +} intel_ext_subevent_table[] = {
> > +       { 0x01, 1, ext_evt_type },
> > +
> > +       /* ACL audio link quality subevents */
> > +       { 0x4a, 2, ext_acl_evt_conn_handle },
> > +       { 0x4b, 4, ext_acl_evt_hec_errors },
> > +       { 0x4c, 4, ext_acl_evt_crc_errors },
> > +       { 0x4d, 4, ext_acl_evt_num_pkt_from_host },
> > +       { 0x4e, 4, ext_acl_evt_num_tx_pkt_to_air },
> > +       { 0x4f, 4, ext_acl_evt_num_tx_pkt_retry },
> > +       { 0x50, 4, ext_acl_evt_num_tx_pkt_retry },
> > +       { 0x51, 4, ext_acl_evt_num_tx_pkt_retry },
> > +       { 0x52, 4, ext_acl_evt_num_tx_pkt_retry },
> > +       { 0x53, 4, ext_acl_evt_num_tx_pkt_retry },
> > +       { 0x54, 4, ext_acl_evt_num_tx_pkt_type },
> > +       { 0x55, 4, ext_acl_evt_num_tx_pkt_type },
> > +       { 0x56, 4, ext_acl_evt_num_tx_pkt_type },
> > +       { 0x57, 4, ext_acl_evt_num_tx_pkt_type },
> > +       { 0x58, 4, ext_acl_evt_num_tx_pkt_type },
> > +       { 0x59, 4, ext_acl_evt_num_tx_pkt_type },
> > +       { 0x5a, 4, ext_acl_evt_num_tx_pkt_type },
> > +       { 0x5b, 4, ext_acl_evt_num_tx_pkt_type },
> > +       { 0x5c, 4, ext_acl_evt_num_tx_pkt_type },
> > +       { 0x5d, 4, ext_acl_evt_num_rx_pkt_from_air },
> > +       { 0x5e, 4, ext_acl_evt_link_throughput },
> > +       { 0x5f, 4, ext_acl_evt_max_packet_latency },
> > +       { 0x60, 4, ext_acl_evt_avg_packet_latency },
> > +
> > +       /* SCO/eSCO audio link quality subevents */
> > +       { 0x6a, 2, ext_sco_evt_conn_handle },
> > +       { 0x6b, 4, ext_sco_evt_num_rx_pkt_from_air },
> > +       { 0x6c, 4, ext_sco_evt_num_tx_pkt_to_air },
> > +       { 0x6d, 4, ext_sco_evt_num_rx_payloads_lost },
> > +       { 0x6e, 4, ext_sco_evt_num_tx_payloads_lost },
> > +       { 0x6f, 20, ext_sco_evt_num_no_sync_errors },
> > +       { 0x70, 20, ext_sco_evt_num_hec_errors },
> > +       { 0x71, 20, ext_sco_evt_num_crc_errors },
> > +       { 0x72, 20, ext_sco_evt_num_naks },
> > +       { 0x73, 20, ext_sco_evt_num_failed_tx_by_wifi },
> > +       { 0x74, 20, ext_sco_evt_num_failed_rx_by_wifi },
> > +       { 0x75, 4, ext_sco_evt_samples_inserted },
> > +       { 0x76, 4, ext_sco_evt_samples_dropped },
> > +       { 0x77, 4, ext_sco_evt_mute_samples },
> > +       { 0x78, 4, ext_sco_evt_plc_injection_data },
> > +
> > +       /* end */
> > +       { 0x0, 0}
> > +};
> > +
> > +static const struct intel_tlv *process_ext_subevent(const struct intel_tlv *tlv,
> > +                                       const struct intel_tlv *last_tlv)
> > +{
> > +       const struct intel_tlv *next_tlv = NEXT_TLV(tlv);
> > +       const struct intel_ext_subevent *subevent = NULL;
> >         int i;
> >
> > +       for (i = 0; intel_ext_subevent_table[i].length > 0; i++) {
> > +               if (intel_ext_subevent_table[i].subevent_id ==
> > +                                                       tlv->subevent_id) {
> > +                       subevent = &intel_ext_subevent_table[i];
> > +                       break;
> > +               }
> > +       }
> > +
> > +       if (!subevent) {
> > +               print_text(COLOR_UNKNOWN_EXT_EVENT,
> > +                               "Unknown extended subevent 0x%2.2x",
> > +                               tlv->subevent_id);
> > +               return NULL;
> > +       }
> > +
> > +       if (tlv->length != subevent->length) {
> > +               print_text(COLOR_ERROR, "Invalid length %d of subevent 0x%2.2x",
> > +                               tlv->length, tlv->subevent_id);
> > +               return NULL;
> > +       }
> > +
> > +       if (next_tlv > last_tlv) {
> > +               print_text(COLOR_ERROR, "Subevent exceeds the buffer size.");
> > +               return NULL;
> > +       }
> > +
> > +       subevent->func(tlv);
> > +
> > +       return next_tlv;
> > +}
> > +
> > +static void intel_vendor_ext_evt(const void *data, uint8_t size)
> > +{
> > +       /* The data pointer points to a number of tlv.*/
> > +       const struct intel_tlv *tlv = data;
> > +       const struct intel_tlv *last_tlv = data + size;
> > +
> > +       /* Process every tlv subevent until reaching last_tlv.
> > +        * The decoding process terminates normally when tlv == last_tlv.
> > +        */
> > +       while (tlv && tlv < last_tlv)
> > +               tlv = process_ext_subevent(tlv, last_tlv);
> > +
> > +       /* If an error occurs in decoding the subevents, hexdump the packet. */
> > +       if (!tlv)
> > +               packet_hexdump(data, size);
> > +}
> > +
> > +/* Vendor extended events with a vendor prefix. */
> > +static const struct vendor_evt vendor_prefix_evt_table[] = {
> > +       { 0x03, "Extended Telemetry", intel_vendor_ext_evt },
> > +       { }
> > +};
> > +
> > +const uint8_t intel_vendor_prefix[] = {0x87, 0x80};
> > +#define INTEL_VENDOR_PREFIX_SIZE sizeof(intel_vendor_prefix)
> > +
> > +/*
> > + * The vendor event with Intel vendor prefix.
> > + * Its format looks like
> > + *   0xff <length> <vendor_prefix> <subopcode> <data>
> > + *   where Intel's <vendor_prefix> is 0x8780.
> > + *
> > + *   When <subopcode> == 0x03, it is a telemetry event; and
> > + *   <data> is a number of tlv data.
> > + */
> > +struct vendor_prefix_evt {
> > +       uint8_t prefix_data[INTEL_VENDOR_PREFIX_SIZE];
> > +       uint8_t subopcode;
> > +};
> > +
> > +static const struct vendor_evt *intel_vendor_prefix_evt(const void *data,
> > +                                                       int *consumed_size)
> > +{
> > +       unsigned int i;
> > +       const struct vendor_prefix_evt *vnd = data;
> > +       char prefix_string[INTEL_VENDOR_PREFIX_SIZE * 2 + 1] = { 0 };
> > +
> > +       /* Check if the vendor prefix matches. */
> > +       for (i = 0; i < INTEL_VENDOR_PREFIX_SIZE; i++) {
> > +               if (vnd->prefix_data[i] != intel_vendor_prefix[i])
> > +                       return NULL;
> > +               sprintf(prefix_string + i * 2, "%02x", vnd->prefix_data[i]);
> > +       }
> > +       print_field("Vendor Prefix (0x%s)", prefix_string);
> > +
> > +       /*
> > +        * Handle the vendor event with a vendor prefix.
> > +        *   0xff <length> <vendor_prefix> <subopcode> <data>
> > +        * This loop checks whether the <subopcode> exists in the
> > +        * vendor_prefix_evt_table.
> > +        */
> > +       for (i = 0; vendor_prefix_evt_table[i].str; i++) {
> > +               if (vendor_prefix_evt_table[i].evt == vnd->subopcode) {
> > +                       *consumed_size = sizeof(struct vendor_prefix_evt);
> > +                       return &vendor_prefix_evt_table[i];
> > +               }
> > +       }
> > +
> > +       return NULL;
> > +}
> > +
> > +const struct vendor_evt *intel_vendor_evt(const void *data, int *consumed_size)
> > +{
> > +       uint8_t evt = *((const uint8_t *) data);
> > +       int i;
> > +
> > +       /*
> > +        * Handle the vendor event without a vendor prefix.
> > +        *   0xff <length> <evt> <data>
> > +        * This loop checks whether the <evt> exists in the vendor_evt_table.
> > +        */
> >         for (i = 0; vendor_evt_table[i].str; i++) {
> >                 if (vendor_evt_table[i].evt == evt)
> >                         return &vendor_evt_table[i];
> >         }
> >
> > -       return NULL;
> > +       /*
> > +        * It is not a regular event. Check whether it is a vendor extended
> > +        * event that comes with a vendor prefix followed by a subopcode.
> > +        */
> > +       return intel_vendor_prefix_evt(data, consumed_size);
> >  }
> > diff --git a/monitor/intel.h b/monitor/intel.h
> > index bf00ad491..bfb04540c 100644
> > --- a/monitor/intel.h
> > +++ b/monitor/intel.h
> > @@ -15,4 +15,4 @@ struct vendor_ocf;
> >  struct vendor_evt;
> >
> >  const struct vendor_ocf *intel_vendor_ocf(uint16_t ocf);
> > -const struct vendor_evt *intel_vendor_evt(uint8_t evt);
> > +const struct vendor_evt *intel_vendor_evt(const void *data, int *consumed_size);
> > diff --git a/monitor/packet.c b/monitor/packet.c
> > index 82513a63c..4a371f508 100644
> > --- a/monitor/packet.c
> > +++ b/monitor/packet.c
> > @@ -9371,9 +9371,14 @@ static const struct vendor_ocf *current_vendor_ocf(uint16_t ocf)
> >         return NULL;
> >  }
> >
> > -static const struct vendor_evt *current_vendor_evt(uint8_t evt)
> > +static const struct vendor_evt *current_vendor_evt(const void *data,
> > +                                                       int *consumed_size)
> >  {
> >         uint16_t manufacturer, msft_opcode;
> > +       uint8_t evt = *((const uint8_t *) data);
> > +
> > +       /* A regular vendor event consumes 1 byte. */
> > +       *consumed_size = 1;
> >
> >         if (index_current < MAX_INDEX) {
> >                 manufacturer = index_list[index_current].manufacturer;
> > @@ -9388,7 +9393,7 @@ static const struct vendor_evt *current_vendor_evt(uint8_t evt)
> >
> >         switch (manufacturer) {
> >         case 2:
> > -               return intel_vendor_evt(evt);
> > +               return intel_vendor_evt(data, consumed_size);
> >         case 15:
> >                 return broadcom_vendor_evt(evt);
> >         }
> > @@ -11007,10 +11012,10 @@ static void le_meta_event_evt(const void *data, uint8_t size)
> >
> >  static void vendor_evt(const void *data, uint8_t size)
> >  {
> > -       uint8_t subevent = *((const uint8_t *) data);
> >         struct subevent_data vendor_data;
> >         char vendor_str[150];
> > -       const struct vendor_evt *vnd = current_vendor_evt(subevent);
> > +       int consumed_size;
> > +       const struct vendor_evt *vnd = current_vendor_evt(data, &consumed_size);
> >
> >         if (vnd) {
> >                 const char *str = current_vendor_str();
> > @@ -11021,12 +11026,13 @@ static void vendor_evt(const void *data, uint8_t size)
> >                         vendor_data.str = vendor_str;
> >                 } else
> >                         vendor_data.str = vnd->str;
> > -               vendor_data.subevent = subevent;
> > +               vendor_data.subevent = vnd->evt;
> >                 vendor_data.func = vnd->evt_func;
> >                 vendor_data.size = vnd->evt_size;
> >                 vendor_data.fixed = vnd->evt_fixed;
> >
> > -               print_subevent(&vendor_data, data + 1, size - 1);
> > +               print_subevent(&vendor_data, data + consumed_size,
> > +                                                       size - consumed_size);
> >         } else {
> >                 uint16_t manufacturer;
> >
> > --
> > 2.32.0.93.g670b81a890-goog
> >
>
>
> --
>
> Joseph Shyh-In Hwang
> Email: josephsih@google.com


-- 
Luiz Augusto von Dentz