On Wed, Jul 16, 2014 at 1:40 PM, Greg KH <greg@xxxxxxxxx> wrote:
>
> On Wed, Jul 16, 2014 at 09:24:28PM +0100, Michalis Pappas wrote:
> > Hi,
> >
> > I'm currently working on bringing the gdm72xx WiMAX driver out of
> > staging. The driver currently uses two control channels:
> >
> > 1. The SIOCDEVPRIVATE ioctl to send and receive state messages
> >
> > 2. A customly defined netlink protocol for passing messages verbatim to
> > the device controller
> >
> > AFAIK both of the above are deprecated, so I considered switching to
> > the interface defined in wimax.h, which defines a communication protocol
> > over generic netlink that replaces (2) nicely. However it is not
> > compatible with (1), as:
> >
> > * Except from the device status, the gdm72xx driver uses two more types
> > of messages (connection and OMA status), which is not supported
> > by wimax.h.
> >
> > * The gdm driver needs to be able to receive status messages from
> > userspace, which is not supported by wimax.h either.
>
> What type of status messages are needed to be sent to the driver?
>
>From what I read from the user-space code, the custom ioctl is to read
the following information from the driver:
enum {
SIOC_DATA_FSM, // Device/Connection State
SIOC_DATA_NETLIST, // Network list
SIOC_DATA_CONNNSP, // Connected NSP
SIOC_DATA_CONNCOMP, // Connection completion info
SIOC_DATA_PROFILEID, // WiMAX profile ID
SIOC_DATA_END
};
Reference:
https://chromium.googlesource.com/chromiumos/third_party/gdmwimax/+/master/sdk/io.c
https://chromium.googlesource.com/chromiumos/third_party/gdmwimax/+/master/sdk/sdk.c
https://chromium.googlesource.com/chromiumos/third_party/gdmwimax/+/master/sdk/wm_ioctl.h
>
> > I therefore consider using the wimax stack as defined in wimax.h for the
> > netlink part, but replacing the ioctl with a file under /sys/class/net/wm0/
>
> Is anyone still working on wimax to even object to add new functions
> like this? :)
>
The driver has a corresponding user-space library, so I'd like to
figure out a way to maintain backward compatibility if possible. But
I'm happy to help make minor changes to the user-space library in
case we need to modify the ioctl / netlink part of the driver (caveat:
I'm not the author of the driver or the user-space library).
> thanks,
>
> greg k-h
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