[ofa-general] Non-Signaled RDMA Read (cxgb3)

[Roland Dreier]

 > I am trying to post a non-signaled RDMA Read WR. Somehow OFED 1.3 running 
 > on a T3 Chelsio Adapter seems
 > not to care what I set for 'enum ibv_send_flags' in my 'struct 
 > ibv_send_wr'. I always get a work completion with status
 > set to IBV_WC_SUCCESS and opcode IBV_WC_RDMA_READ. When creating the 
 > 'struct ibv_qp' I have set
 > 'sq_sig_all = 0' in 'struct ibv_qp_init_attr'. With RDMA Write and Send I 
 > do not get a WC when I set the 'ibv_send_flags'
 > to 0.
 > 
 > What am I missing here?

Looks like you're hitting this -- the cxgb3 driver has:

                case IB_WR_RDMA_READ:
                        t3_wr_opcode = T3_WR_READ;
                        t3_wr_flags = 0; /* T3 reads are always signaled */

so I guess the HW can't do unsignaled RDMA reads.

 - R.