On Wed, Dec 16, 2015 at 11:26:39AM +0100, Michael Wang wrote:
>
> On 12/15/2015 06:30 PM, Jason Gunthorpe wrote:
> > On Tue, Dec 15, 2015 at 05:38:34PM +0100, Michael Wang wrote:
> >> The hop_limit is only suggest that the package allowed to be
> >> routed, not have to, correct?
> >
> > If the hop limit is >= 2 (?) then the GRH is mandatory. The
> > SM will return this information in the PathRecord if it determines a
> > GRH is required. The whole stack follows this protocol.
> >
> > The GRH is optional for in-subnet communications.
>
> Thanks for the explain :-)
>
> I've rechecked the ib_init_ah_from_path() again, and found it
> still set IB_AH_GRH when the GID cache missing, but with:
How do you mean?
ah_attr->ah_flags = IB_AH_GRH;
ah_attr->grh.dgid = rec->dgid;
ret = ib_find_cached_gid(device, &rec->sgid, ndev, &port_num,
&gid_index);
if (ret) {
if (ndev)
dev_put(ndev);
return ret;
}
If find_cached_gid fails then ib_init_ah_from_path also fails.
Is there a case where ib_find_cached_gid can succeed but not return
good data?
I agree it would read nicer if the ah_flags and gr.dgid was moved
after the ib_find_cached_gid
> BTW, cma_sidr_rep_handler() also call ib_init_ah_from_path() with out
> a check on return.
That sounds like a problem.
Jason
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