| Message ID | 20210316224957.3294962-1-danielwinkler@google.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | Bluetooth: Fix scannable broadcast advertising on extended APIs | expand |
Hi Maintainers, Friendly reminder to review this V3 patch at your convenience. Thanks! Daniel On Tue, Mar 16, 2021 at 3:50 PM Daniel Winkler <danielwinkler@google.com> wrote: > > Hello Maintainers, > > We have discovered that when userspace registers a broadcast > (non-connectable) advertisement with scan response data, it exposes a > limitation in the new extended MGMT APIs. At the time that the > parameters are registered with the controller, kernel does not yet have > the advertising data and scan response (coming in a separate MGMT call), > and will default to a non-scannable PDU. When the MGMT call for > data/scan response is received, the controller will either fail when we > request to set the scan response, or return success and not use it. > > This series along with another in kernel will allow userspace to pass a > flag with the params request indicating if the advertisement contains a > scan response. This allows kernel to register the parameters correctly > with the controller. > > The patch is tested with a scannable broadcast advertisement on Hatch > and Kukui chromebooks (ext and non-ext capabilities) and ensuring a > peripheral device can detect the scan response. > > Best, > Daniel > > Changes in v3: > - Use helpers to determine scannable rather than generating earlier > > Changes in v2: > - Check kernel supports flag before setting it > > Daniel Winkler (2): > advertising: Create and use scannable adv param flag > doc/mgmt-api: Update documentation for scan_rsp param flag > > doc/mgmt-api.txt | 5 +++++ > lib/mgmt.h | 1 + > src/advertising.c | 24 +++++++++++++++++++++++- > src/shared/ad.c | 17 +++++++++++++++++ > src/shared/ad.h | 2 ++ > 5 files changed, 48 insertions(+), 1 deletion(-) > > -- > 2.31.0.rc2.261.g7f71774620-goog >
Hi Daniel, On Mon, Mar 22, 2021 at 9:32 AM Daniel Winkler <danielwinkler@google.com> wrote: > > Hi Maintainers, > > Friendly reminder to review this V3 patch at your convenience. > > Thanks! > Daniel > > > On Tue, Mar 16, 2021 at 3:50 PM Daniel Winkler <danielwinkler@google.com> wrote: > > > > Hello Maintainers, > > > > We have discovered that when userspace registers a broadcast > > (non-connectable) advertisement with scan response data, it exposes a > > limitation in the new extended MGMT APIs. At the time that the > > parameters are registered with the controller, kernel does not yet have > > the advertising data and scan response (coming in a separate MGMT call), > > and will default to a non-scannable PDU. When the MGMT call for > > data/scan response is received, the controller will either fail when we > > request to set the scan response, or return success and not use it. > > > > This series along with another in kernel will allow userspace to pass a > > flag with the params request indicating if the advertisement contains a > > scan response. This allows kernel to register the parameters correctly > > with the controller. > > > > The patch is tested with a scannable broadcast advertisement on Hatch > > and Kukui chromebooks (ext and non-ext capabilities) and ensuring a > > peripheral device can detect the scan response. > > > > Best, > > Daniel > > > > Changes in v3: > > - Use helpers to determine scannable rather than generating earlier > > > > Changes in v2: > > - Check kernel supports flag before setting it > > > > Daniel Winkler (2): > > advertising: Create and use scannable adv param flag > > doc/mgmt-api: Update documentation for scan_rsp param flag > > > > doc/mgmt-api.txt | 5 +++++ > > lib/mgmt.h | 1 + > > src/advertising.c | 24 +++++++++++++++++++++++- > > src/shared/ad.c | 17 +++++++++++++++++ > > src/shared/ad.h | 2 ++ > > 5 files changed, 48 insertions(+), 1 deletion(-) > > > > -- > > 2.31.0.rc2.261.g7f71774620-goog > > Applied, thanks.
Hello Maintainers, We have discovered that when userspace registers a broadcast (non-connectable) advertisement with scan response data, it exposes a limitation in the new extended MGMT APIs. At the time that the parameters are registered with the controller, kernel does not yet have the advertising data and scan response (coming in a separate MGMT call), and will default to a non-scannable PDU. When the MGMT call for data/scan response is received, the controller will either fail when we request to set the scan response, or return success and not use it. This series along with another in kernel will allow userspace to pass a flag with the params request indicating if the advertisement contains a scan response. This allows kernel to register the parameters correctly with the controller. The patch is tested with a scannable broadcast advertisement on Hatch and Kukui chromebooks (ext and non-ext capabilities) and ensuring a peripheral device can detect the scan response. Best, Daniel Changes in v3: - Use helpers to determine scannable rather than generating earlier Changes in v2: - Check kernel supports flag before setting it Daniel Winkler (2): advertising: Create and use scannable adv param flag doc/mgmt-api: Update documentation for scan_rsp param flag doc/mgmt-api.txt | 5 +++++ lib/mgmt.h | 1 + src/advertising.c | 24 +++++++++++++++++++++++- src/shared/ad.c | 17 +++++++++++++++++ src/shared/ad.h | 2 ++ 5 files changed, 48 insertions(+), 1 deletion(-)