On Tue, Jun 02, 2015 at 11:09:59AM +0530, Varka Bhadram wrote: > This patch will export the supported commands by the devices > to the user. This is required because user should know supported > commands by the IEEE-802.15.4 devices. Drivers that are there in > the mainline are not supporting all the functionalities that the > core is providing to us. > > Signed-off-by: Varka Bhadram <varkab@xxxxxxx> > --- > Hi, > > I am looking for the way to export the following commands > o NL802154_CMD_SET_MAX_FRAME_RETRIES > o NL802154_CMD_SET_BACKOFF_EXPONENT > o NL802154_CMD_SET_MAX_CSMA_BACKOFFS > > Any inputs..? > These commands are always supported. If a driver doesn't support it, indicated by the hw flags, then we assume 802.15.4 defaults. If you driver doesn't fit to the 802.15.4 you need to change it, otherwise it's a bug in your driver. It's a little bit more complex, the backoffs and backoffs exponent depends if max frame retries supports values above or equal 0. But then you should assume the 802.15.4 defaults for these values if your transceiver supports "-1" only. These parameters above are for the MAC settings of 802.15.4 and the 802.15.4 standard describes for each a "default parameter". It's very simple, if the driver doesn't tell anything we assume these defaults parameters and you can't set your transceiver outside of this parameter via nl802154. PHY settings are different, because 802.15.4 describes no default settings for PIB attributes. We don't assume nothing here, but is also a bug inside your driver because you don't support WPAN_PHY_FLAG for e.g. tx power, because sending without any tx power makes no sense. Nevertheless the driver doesn't support to ask which one. The same for CCA handling (when max frame retries are 0 or above, that actually means CSMA-CA handling). Now: On MIB values the 802.15.4 describes default setting, if the driver doesn't support it we assume "defaults". On PIB values the standard describes no default values and we assume nothing, it's indicated by the WPAN_PHY_FLAG if the driver supports to ask the current setting or not. But also on phy settings (TX_POWER, CCA_MODE (CCA_ED_LEVEL depends if the right CCA_MODE is supported)), but this _sometimes_ (in case of tx power _always_) doesn't represent the reality. A phy which transmit has always some tx power setting. - Alex -- To unsubscribe from this list: send the line "unsubscribe linux-wpan" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
