On Tue, Apr 07, 2015 at 03:16:30PM -0500, Steve Wise wrote: > > > > -----Original Message----- > > From: Jason Gunthorpe [mailto:jgunthorpe@xxxxxxxxxxxxxxxxxxxx] > > Sent: Tuesday, April 07, 2015 3:13 PM > > To: Michael Wang > > Cc: Roland Dreier; Sean Hefty; linux-rdma@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx; > > netdev@xxxxxxxxxxxxxxx; Hal Rosenstock; Tom Tucker; Steve Wise; Hoang-Nam Nguyen; Christoph Raisch; Mike Marciniszyn; Eli Cohen; > > Faisal Latif; Upinder Malhi; Trond Myklebust; J. Bruce Fields; David S. Miller; Ira Weiny; PJ Waskiewicz; Tatyana Nikolova; Or > Gerlitz; Jack > > Morgenstein; Haggai Eran; Ilya Nelkenbaum; Yann Droneaud; Bart Van Assche; Shachar Raindel; Sagi Grimberg; Devesh Sharma; Matan > > Barak; Moni Shoua; Jiri Kosina; Selvin Xavier; Mitesh Ahuja; Li RongQing; Rasmus Villemoes; Alex Estrin; Doug Ledford; Eric > Dumazet; Erez > > Shitrit; Tom Gundersen; Chuck Lever > > Subject: Re: [PATCH v2 10/17] IB/Verbs: Adopt management helpers for IB helpers > > > > On Tue, Apr 07, 2015 at 02:35:22PM +0200, Michael Wang wrote: > > > index f704254..4e61104 100644 > > > +++ b/drivers/infiniband/core/sa_query.c > > > @@ -540,7 +540,7 @@ int ib_init_ah_from_path(struct ib_device *device, u8 port_num, > > > ah_attr->port_num = port_num; > > > ah_attr->static_rate = rec->rate; > > > > > > - force_grh = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_ETHERNET; > > > + force_grh = !rdma_transport_ib(device, port_num); > > > > Maybe these tests should be called cap_mandatory_grh - but I'm not > > really sure how iWarp uses the GRH fields in the AH... > > > > iWARP runs on top of TCP...this SA code is all IB-specific. The reason it was checking for ETHERNET, I think, is for RoCE. So > this change is totally incorrect, I think, because RoCE is an IB transport, but it runs on ETHERNET. But RoCE does not have an SA? Looks like ib_init_ah_from_path was overloaded to handle non-standard "path records". It seems like the correct functionality would be to use ib_init_ah_from_path() for true SA PathRecords and have another call iboe_init_ah() wrap ib_init_ah_from_path() when RoCE address information is needed in the AH. For Michaels patches I think force_grh = rdma_device_is_iboe(...) is the logic we need here. Ira > > Steve. > > > -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
