Wolfgang Grandegger wrote: > On 06/17/2010 08:19 PM, Marc Kleine-Budde wrote: >> Wolfgang Grandegger wrote: >>> On 06/17/2010 06:54 PM, Marc Kleine-Budde wrote: >>>> Wolfgang Grandegger wrote: >>>>>> Now I try to use more current version (rev 1181) of SocketCAN, because >>>>>> we >>>>>> need netlink CAN control API. Here I see one problem - no error active >>>>>> is >>>>>> indicated. The CAN_ERR_CRTL_UNSPEC error control messages are missed. >>>>>> I observe this problem with both sysfs and netlink variants. >>>>>> >>>>>> >>>>>> Is it known and wanted behavior, to not indicate CAN_ERR_CRTL_UNSPEC any >>>>>> more? >>>>> Yes, this is the current (known) behavior and it has been discussed >>>>> before. We only report "increasing" state changes >>>>> active->warning->passive->bus-off. I think it's not what we really want. >>>>> It should be fixed. >>>> Have a look at the statemachine in the at91_can driver[1]. I started to >>>> make it more generic in order to be usable as a generic component. >>>> >>>> Cheers, Marc >>>> >>>> [1] http://lxr.linux.no/#linux+v2.6.34/drivers/net/can/at91_can.c#L757 >>> I see, we don't have a #define for state changes to error active. I tend >>> to rename CAN_ERR_CRTL_UNSPEC to CAN_ERR_CRTL_ACTIVE. But this needs >>> some more thoughts and discussion. "CAN_ERR_CTRL" stands for controller >>> *problems* and that's what we have implemented. I will have a closer >>> look tomorrow. >> ACK, I see the need for discussion, too. However, if your time permits, >> have a look at the above mentioned state machine. Don't look to close at >> the individual bits that are send in the states, they can be discussed >> seperately. > > The AT91 driver uses CAN_ERR_PROT_ACTIVE to signal state changes to > error active in a special way. I think it should be handled in a generic
ACK, if we've defined what to signal, it's easy to implement. > way like any other state change, e.g. active->warning, passive->warning, > etc. We need to fix all other drivers anyway. But I wass talking about the state machine in general. Does it make sense to use it in other drivers aswell. Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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