Hi, > Where you fund the communication between PF and VF is by writing its BAR? http://lxr.free-electrons.com/source/drivers/net/ethernet/mellanox/mlx4/cmd.c#L1964 Best Regards, Bob On Fri, Aug 29, 2014 at 9:51 AM, Wei Yang <weiyang@xxxxxxxxxxxxxxxxxx> wrote: > On Thu, Aug 28, 2014 at 10:58:50PM +0530, Bob Biloxi wrote: >>Hi All, >> >> >>I really appreciate this wonderful community which has immensely >>helped me broaden my knowledge and understanding. >> >> >>I was going through the mlx4 sriov code, trying to understand the >>communication between the VF driver and the PF driver. >> >>I was having a few queries..hoping to get a better understanding. >> >> >>As I understand, the commands are communicated between VF and PF >>through a mechanism called communication channel. VF writes to >>specific address in its BAR space, PF gets an event and then proceeds >>ahead to read the command from its BAR space and then complete the >>execution of it.. >> >> >>Now, my query is, lets say the VF driver is not yet present and only >>the PF driver is there... >> >>In this case, can we simulate a VF command write and get notified >>through an event? >> > > Hi, > > I am not that familiar with mlx4 driver. As you mentioned in previous, VF > communicate with PF by writing some word in BAR and PF gets it. If this is > true, I believe it would works. > >>For eg. we write to some offset in the PF BAR space itself upon >>completion of which, an event is generated because of the write? kind >>of like loopback mechanism. >> >> >>I searched through the code but couldn't find anywhere. >> >>Can anyone please help me understand if this is possible? And if there >>is any location in the code where i can find this? > > Where you fund the communication between PF and VF is by writing its BAR? > >> >>Thanks a lot in advance!! >> >> >>Best Regards, >>Bob >>-- >>To unsubscribe from this list: send the line "unsubscribe linux-pci" in >>the body of a message to majordomo@xxxxxxxxxxxxxxx >>More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > Richard Yang > Help you, Help me > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
