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[v2,0/1] Bluetooth: ISO: Support multiple BIGs

Message ID 20230619145316.3185-1-iulia.tanasescu@nxp.com
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Series Bluetooth: ISO: Support multiple BIGs | expand

Message

Iulia Tanasescu June 19, 2023, 2:53 p.m. UTC 
This patch adds support for creating multiple BIGs. According to
spec, each BIG shall have an unique handle, and each BIG should
be associated with a different advertising handle. Otherwise,
the LE Create BIG command will fail, with error code
Command Disallowed (for reusing a BIG handle), or
Unknown Advertising Identifier (for reusing an advertising
handle).

Currently, if the user tries to connect 2 sockets with the
BIG/BIS QoS fields unset, the kernel will assign the same
BIG handle for every BIG, as seen in the btmon log below:

< HCI Command: LE Create Broadcast Isochronous Group (0x08|0x0068) plen 31
        Handle: 0x00
        Advertising Handle: 0x01
        Number of BIS: 1
        SDU Interval: 10000 us (0x002710)
        Maximum SDU size: 40
        Maximum Latency: 10 ms (0x000a)
        RTN: 0x02
        PHY: LE 2M (0x02)
        Packing: Sequential (0x00)
        Framing: Unframed (0x00)
        Encryption: 0x00
        Broadcast Code: 00000000000000000000000000000000

> HCI Event: Command Status (0x0f) plen 4
      LE Create Broadcast Isochronous Group (0x08|0x0068) ncmd 1
        Status: Success (0x00)

> HCI Event: LE Meta Event (0x3e) plen 21
      LE Broadcast Isochronous Group Complete (0x1b)
        Status: Success (0x00)
        Handle: 0x00
        BIG Synchronization Delay: 912 us (0x000390)
        Transport Latency: 912 us (0x000390)
        PHY: LE 2M (0x02)
        NSE: 3
        BN: 1
        PTO: 1
        IRC: 3
        Maximum PDU: 40
        ISO Interval: 10.00 msec (0x0008)
        Connection Handle #0: 10

< HCI Command: LE Create Broadcast Isochronous Group (0x08|0x0068)
        Handle: 0x00
        Advertising Handle: 0x01
        Number of BIS: 1
        SDU Interval: 10000 us (0x002710)
        Maximum SDU size: 40
        Maximum Latency: 10 ms (0x000a)
        RTN: 0x02
        PHY: LE 2M (0x02)
        Packing: Sequential (0x00)
        Framing: Unframed (0x00)
        Encryption: 0x00
        Broadcast Code: 00000000000000000000000000000000

> HCI Event: Command Status (0x0f) plen 4
      LE Create Broadcast Isochronous Group (0x08|0x0068) ncmd 1
        Status: Command Disallowed (0x0c)
        
Since different BIGs need to be associated with different advertising
handles, this patch also adds support for starting multiple periodic
advertising instances. If an avertising instance has the periodic
flag set, the enabled flag will be used to indicate whether both
extended and periodic advertising are enabled for that handle.

Iulia Tanasescu (1):
  Bluetooth: ISO: Support multiple BIGs

 include/net/bluetooth/hci_core.h |  5 ++--
 net/bluetooth/hci_conn.c         | 40 ++++++++++++++------------------
 net/bluetooth/hci_event.c        | 35 +++++++++++++++++++++++-----
 net/bluetooth/hci_sync.c         | 28 +++++++++++-----------
 4 files changed, 63 insertions(+), 45 deletions(-)


base-commit: 817efd3cad7481ce2ee25fac5108afecbad56228