[openib-general] ip_ib_mc_map?

[Steve Wise]

On Thu, 2007-02-01 at 11:09 +0200, Michael S. Tsirkin wrote:
> > Quoting Steve WIse <swise at opengridcomputing.com>:
> > Subject: Re: ip_ib_mc_map?
> > 
> > On Wed, 2007-01-31 at 17:53 -0800, Sean Hefty wrote:
> > > Steve Wise wrote:
> > > > Perhaps there's no backport for this to rhel4u4?
> > > 
> > > I would have thought so, but I really don't know.  The function is called from 
> > > net/ipv4/arp.c, and not directly by ipoib.  So, I don't know how the backport 
> > > patches typically handle this.
> > > 
> > > - Sean
> > 
> > Here's what I see:
> > 
> > ip_ib_mc_map() is called directly from cma_join_ib_multicast(), which is
> > added to the ofed_1_2 cma.c via patch file:
> > kernel_patches/fixes/sean_multicast_1.patch
> > 
> > So when I compiled ofed_1_2 on rhel4u4, the cma wouldn't load because
> > there is no ip_ib_mc_map() in rhel4u4.  
> > 
> > So you need a backport patch for this to work on rhel4u4.  Probably many
> > of the older kernels.
> 
> I think this breakage is U4 specific. Someone at RH went to the trouble to
> rip all of IB related stuff out of the U4 kernel.
> 
> I think just calling ip_tr_mc_map on U4 instead will be enough.
> 

I changed cma.c to call ip_tr_mc_map() and I can at least load rdma_cm
now.  I didn't test any mcast, but the rdma-cm is working over iwarp...

Steve.