Steve Wise wrote:
Roland Dreier wrote:
> 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.
Right. This is a T3 hw limitation. It will be fixed in the next chip.
Steve.
Note that I _could_ add code in the driver/lib poll routine to "eat"
these cqes. But there is a fundamental problem in that if the CQ is
armed, then the HW _will_ generate an interrupt in this case. This
leads to a "false notification" which breaks the semantics of the
notification mechanism. I'm not sure how bad that is? To the
application, it would receive a notification, then go poll and get nothing.
Steve.
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