Re: [RFC bluetooth-next 0/4] ieee802154: add support for phy capabilities

[Varka Bhadram <varkabhadram@gmail.com>]

On 04/09/2015 02:58 PM, Alexander Aring wrote:
> On Thu, Apr 09, 2015 at 12:02:10PM +0530, Varka Bhadram wrote:
>> On 04/08/2015 04:48 PM, Alexander Aring wrote:
>>> Hi,
>>>
>>> this patches introduce a mechanism to get phy capabilities. We simple add
>>> some additional pib values like "channels_supported" information. These
>>> information also includes mib values which are phy dependent like frame_retries
>>> or csma_backoffs, this is necessary because the phy doing a little bit mac
>>> stuff. We simple extend the pib according these phy dependent mac values.
>>>
>>> These capabilities are by default full 802.15.4 complaint, if some transceiver
>>> supports less functionality only then these values need to be overwritten inside
>>> the driver-layer.
>>>
>>> Fruthermore we also add functionality to dump these values via
>>> NL802154_CMD_GET_WPAN_PHY.
>>>
>>> - Alex
>>>
>>> Cc: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
>>> Cc: Varka Bhadram <varkabhadram@gmail.com>
>>>
>>> Alexander Aring (4):
>>>   ieee802154: introduce wpan_phy_supported struct
>>>   ieee802154: move channels supported out of softmac
>>>   ieee802154: add several phy supported handling
>>>   at86rf230: set cca_modes supported flags
>>>
>>>  drivers/net/ieee802154/at86rf230.c | 14 ++++++++++----
>>>  drivers/net/ieee802154/cc2520.c    |  2 +-
>>>  drivers/net/ieee802154/fakelb.c    | 30 +++++++++++++++---------------
>>>  drivers/net/ieee802154/mrf24j40.c  |  2 +-
>>>  include/net/cfg802154.h            | 11 ++++++++++-
>>>  net/ieee802154/nl-phy.c            |  4 ++--
>>>  net/ieee802154/nl802154.c          | 29 ++++++++++++++++++++++-------
>>>  net/mac802154/cfg.c                |  4 ----
>>>  net/mac802154/main.c               | 10 ++++++++++
>>>  9 files changed, 71 insertions(+), 35 deletions(-)
>>>
>> And also we need to look into expose available power level (supported by transeiver)
>> to the user space by iwpan. Then user can configure the particular power level. 
>>
>> If not user don't know the power levels that the transceiver support.
>>
> yep... I will try to add it to the next series, also for ed_level. For
> 700/800/900 Mhz at86rf212 it depends on which band the transceiver operates
> and the available tx_power settings.
>
> When I try to implement it, then I need to know the country/band laws
> what's the min and max tx_power db values? Does something like this
> exists? Is s8 as datatype really enough to support all available
> tx_power settings? -> (not because I also saw some floating point tx_power
> settings, but then we simple doesn't provide them). I will try to
> introduce something which supports the at86rf2xx transceiver values. We
> can still change the interface again later if it doesn't fit, but then
> everybody will hate us. :-)
>
> - Alex

I think its not going to work out. But i am worrying about how the driver user
will know the power levels available..?

How mac80211 is managing this issue..?

-- 
Varka Bhadram