On 11-03-04 12:35 PM, Andre Guedes wrote:
During a LE connection establishment, the host should be able to infer the
bdaddr type from a given bdaddr.
To achieve that, during the LE scanning, the host stores the bdaddr and the
bdaddr type gathered from advertising reports. The host keeps a list of
advertising entry (bdaddr and bdaddr_type) for later lookup. This list will
be called Advertising Cache.
My biggest problem with this is testing purposes.
While it is true that the bdaddr_type can be extracted from the LE Scan
data, when you are at an event like UPF, there can be an awful lot of
devices very close to you.
It would be nice to be able to explicitly specify both the bdaddr and
bdaddr_type during these things.
But I agree that as a deployed device, caching from an LE scan makes the
most sense.
Will this also work for (future) private addressing, where the address
being connected to may not be the one initially seen in the scan?
Since the penality to connect to an unreachable device is relatively high,
we must keep only fresh advertising entries on the advertising cache. So,
before each LE scanning the advertising cache is cleared. Also, after the LE
scanning, a timer is set to clear the cache.
Next steps include removing all advertising cache from userspace and
implementing a mechanism to sync kernel and userspace advertising cache.
Patches are rebased using Vinicius SMP patches, repo:
git://git.infradead.org/users/vcgomes/linux-2.6.git for-next
Anderson Briglia (1):
Bluetooth: Implement advertising report meta event
Andre Guedes (5):
Bluetooth: LE advertising info caching
Bluetooth: Protect adv_entries with a RW semaphore
Bluetooth: Check advertising cache in hci_connect()
Bluetooth: Clear advertising cache before scanning
Bluetooth: Add a timer to clear the advertising cache
include/net/bluetooth/hci.h | 20 ++++++++
include/net/bluetooth/hci_core.h | 16 +++++++
net/bluetooth/hci_conn.c | 12 ++++-
net/bluetooth/hci_core.c | 92 ++++++++++++++++++++++++++++++++++++++
net/bluetooth/hci_event.c | 48 ++++++++++++++++++++
5 files changed, 185 insertions(+), 3 deletions(-)
--
To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
--
Brian Gix
bgix@xxxxxxxxxxxxxx
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
--
To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
