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| author | Andrei Emeltchenko | 2011-01-03 10:14:36 +0100 |
|---|---|---|
| committer | Gustavo F. Padovan | 2011-02-08 04:40:04 +0100 |
| commit | e702112ff68a554bcac16bb03ddc2b8e5425bcbf (patch) | |
| tree | 872f93640d646326167d41b7797d5a7eea75b751 /include/net/bluetooth/hci_core.h | |
| parent | Bluetooth: Fix failure to release lock in read_index_list() (diff) | |
| download | kernel-qcow2-linux-e702112ff68a554bcac16bb03ddc2b8e5425bcbf.tar.gz kernel-qcow2-linux-e702112ff68a554bcac16bb03ddc2b8e5425bcbf.tar.xz kernel-qcow2-linux-e702112ff68a554bcac16bb03ddc2b8e5425bcbf.zip | |
Bluetooth: Use non-flushable by default L2CAP data packets
Modification of Nick Pelly <npelly@google.com> patch.
With Bluetooth 2.1 ACL packets can be flushable or non-flushable. This commit
makes ACL data packets non-flushable by default on compatible chipsets, and
adds the BT_FLUSHABLE socket option to explicitly request flushable ACL
data packets for a given L2CAP socket. This is useful for A2DP data which can
be safely discarded if it can not be delivered within a short time (while
other ACL data should not be discarded).
Note that making ACL data flushable has no effect unless the automatic flush
timeout for that ACL link is changed from its default of 0 (infinite).
Default packet types (for compatible chipsets):
Frame 34: 13 bytes on wire (104 bits), 13 bytes captured (104 bits)
Bluetooth HCI H4
Bluetooth HCI ACL Packet
.... 0000 0000 0010 = Connection Handle: 0x0002
..00 .... .... .... = PB Flag: First Non-automatically Flushable Packet (0)
00.. .... .... .... = BC Flag: Point-To-Point (0)
Data Total Length: 8
Bluetooth L2CAP Packet
After setting BT_FLUSHABLE
(sock.setsockopt(274 /*SOL_BLUETOOTH*/, 8 /* BT_FLUSHABLE */, 1 /* flush */))
Frame 34: 13 bytes on wire (104 bits), 13 bytes captured (104 bits)
Bluetooth HCI H4
Bluetooth HCI ACL Packet
.... 0000 0000 0010 = Connection Handle: 0x0002
..10 .... .... .... = PB Flag: First Automatically Flushable Packet (2)
00.. .... .... .... = BC Flag: Point-To-Point (0)
Data Total Length: 8
Bluetooth L2CAP Packet
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Diffstat (limited to 'include/net/bluetooth/hci_core.h')
| -rw-r--r-- | include/net/bluetooth/hci_core.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index d2cf88407690..4e14610baece 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -458,6 +458,7 @@ void hci_conn_del_sysfs(struct hci_conn *conn); #define lmp_sniffsubr_capable(dev) ((dev)->features[5] & LMP_SNIFF_SUBR) #define lmp_esco_capable(dev) ((dev)->features[3] & LMP_ESCO) #define lmp_ssp_capable(dev) ((dev)->features[6] & LMP_SIMPLE_PAIR) +#define lmp_no_flush_capable(dev) ((dev)->features[6] & LMP_NO_FLUSH) /* ----- HCI protocols ----- */ struct hci_proto { |