IB/qib: Process RDMA WRITE ONLY with IMMEDIATE properly

See table 35 in IBA - the header order for RDMA_WRITE_ONLY_WITH_IMMEDIATE
and SEND_LAST_WITH_IMMEDIATE is different: the RDMA_WRITE_ONLY has
a RETH header before the immediate data, so we need a different code path
to extract the immediate data.

I tested this with a userspace app that does RDMA_WRITE with immediate
on a QLE7140.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/qib/qib_rc.c

@@ -2068,7 +2068,10 @@ send_last:
 			goto nack_op_err;
 		if (!ret)
 			goto rnr_nak;
-		goto send_last_imm;
+		wc.ex.imm_data = ohdr->u.rc.imm_data;
+		hdrsize += 4;
+		wc.wc_flags = IB_WC_WITH_IMM;
+		goto send_last;
 
 	case OP(RDMA_READ_REQUEST): {
 		struct qib_ack_entry *e;

drivers/infiniband/hw/qib/qib_uc.c

@@ -457,8 +457,10 @@ rdma_first:
 		}
 		if (opcode == OP(RDMA_WRITE_ONLY))
 			goto rdma_last;
-		else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
+		else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
+			wc.ex.imm_data = ohdr->u.rc.imm_data;
 			goto rdma_last_imm;
+		}
 		/* FALLTHROUGH */
 	case OP(RDMA_WRITE_MIDDLE):
 		/* Check for invalid length PMTU or posted rwqe len. */
@@ -471,8 +473,8 @@ rdma_first:
 		break;
 
 	case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
-rdma_last_imm:
 		wc.ex.imm_data = ohdr->u.imm_data;
+rdma_last_imm:
 		hdrsize += 4;
 		wc.wc_flags = IB_WC_WITH_IMM;