Subhasish Ghosh wrote: > Thank you for the clarification. > > Actually, our controller is still in the implementation stage. > Basically, we can configure an ID for each mailbox.
Historically we distinguish between "basic" and "full" CAN controllers. In contrast to basic CAN controllers, full CAN controllers allow to do filtering in hardware via various RX message objects unloading the CPU. For Socket-CAN, Basic CAN controllers are definitely the better solution, especially if they provide reasonable buffering of RX messages, like the SJA1000. Wolfgang. > ________________________________ > From: Wolfgang Grandegger <w...@grandegger.com> > To: Subhasish Ghosh <subhasis...@yahoo.com> > Cc: socketcan-users@lists.berlios.de > Sent: Tue, 27 April, 2010 12:55:57 PM > Subject: Re: [Socketcan-users] Socket can h/w filter > > Subhasish Ghosh wrote: >> Hi!, >> >> The CAN controller that I am using allows configuring per-mailbox IDs. CAN >> being a broadcast network, this feature reduces the interrupts to the >> processor. > > What CAN controller are you using. > >> From Documentation/can.txt, what I understand is that the socketcan >> interface does not provide any mechanism to configure the h/w for this >> purpose (chapter 6.3). > > Right, hardware filtering is not yet supported. > >> Instead, the h/w is configured to receive all identifiers and the filtering >> is done on the stack (like ti_hecc.c) and to avoid hogging the processor >> some interrupt mitigation techniques like NAPI is implemented. >> >> Isn't this a work around? > > Well, software filtering is used for the sake of portability. > >> My question is, did I miss something, is there any way to configure the h/w >> for this purpose. Is it a good idea if I cook up a sysfs interface for my >> driver for this. > > The problem is that the filtering capabilities of CAN controllers are > very hardware specific and providing a generic interface is not trivial. > But that's definetely something on the to-do list for Socket-CAN. Any > ideas, suggestions or even patches are welcome. What are your specific > requirements? > > Wolfgang. > > > > > > ------------------------------------------------------------------------ > > _______________________________________________ > Socketcan-users mailing list > Socketcan-users@lists.berlios.de > https://lists.berlios.de/mailman/listinfo/socketcan-users _______________________________________________ Socketcan-users mailing list Socketcan-users@lists.berlios.de https://lists.berlios.de/mailman/listinfo/socketcan-users
