Re: [PATCH V2 1/5] IB Netlink Infrastructure

[Nir Muchtar <nirm-smomgflXvOZWk0Htik3J/w@public.gmane.org>]

On Tue, 2010-11-30 at 10:51 -0700, Jason Gunthorpe wrote:

> On Tue, Nov 30, 2010 at 02:56:41PM +0200, Nir Muchtar wrote:
> 
> > Do you mean adding this to ib_core?  I'm not sure we want to
> > autoload ib_core whenever the userspace asks for "socket(PF_NETLINK,
> > SOCK_RAW, NETLINK_INFINIBAND)" What's wrong with receiving a
> > "protocol not supported" error?  If ib_core is not loaded then
> > there's no data anyway.  Am I missing other possible effects of
> > MODULE_ALIAS here?
> 
> It seems to be kernel policy to annotate this sort of autoload
> meta-data.
> 
> If the module is demand loaded or not is a userspace choice.
> 
> Apps using this should handle both cases.
> 
> Jason

MODULE_ALIAS_PF_PROTO is used by the netlink layer once netlink_create
is called by userspace (with request_module), So it is used by dedicated
netlink modules such as inet_diag and nf_netlink. netlink_scsitransport
is a closer example to our design, where there is no use of
MODULE_ALIAS.

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