RDMA/rxe: Remove qp->resp.state

The rxe driver has four different QP state variables,
    qp->attr.qp_state,
    qp->req.state,
    qp->comp.state, and
    qp->resp.state.
All of these basically carry the same information.

This patch replaces uses of qp->resp.state by qp->attr.qp_state.  This is
the first of three patches which will remove all but the qp->attr.qp_state
variable. This will bring the driver closer to the IBA description.

Link: https://lore.kernel.org/r/20230405042611.6467-1-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: rpearsonhpe-design

drivers/infiniband/sw/rxe/rxe_net.c

@@ -414,7 +414,7 @@ int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
 	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 
 	if ((is_request && (qp->req.state != QP_STATE_READY)) ||
-	    (!is_request && (qp->resp.state != QP_STATE_READY))) {
+	    (!is_request && (qp_state(qp) <= IB_QPS_RTR))) {
 		rxe_dbg_qp(qp, "Packet dropped. QP is not in ready state\n");
 		goto drop;
 	}

drivers/infiniband/sw/rxe/rxe_qp.c

@@ -287,7 +287,6 @@ static int rxe_qp_init_resp(struct rxe_dev *rxe, struct rxe_qp *qp,
 
 	qp->resp.opcode		= OPCODE_NONE;
 	qp->resp.msn		= 0;
-	qp->resp.state		= QP_STATE_RESET;
 
 	return 0;
 }
@@ -479,7 +478,6 @@ static void rxe_qp_reset(struct rxe_qp *qp)
 	/* move qp to the reset state */
 	qp->req.state = QP_STATE_RESET;
 	qp->comp.state = QP_STATE_RESET;
-	qp->resp.state = QP_STATE_RESET;
 
 	/* drain work and packet queuesc */
 	rxe_requester(qp);
@@ -532,7 +530,6 @@ static void rxe_qp_drain(struct rxe_qp *qp)
 void rxe_qp_error(struct rxe_qp *qp)
 {
 	qp->req.state = QP_STATE_ERROR;
-	qp->resp.state = QP_STATE_ERROR;
 	qp->comp.state = QP_STATE_ERROR;
 	qp->attr.qp_state = IB_QPS_ERR;
 
@@ -663,13 +660,11 @@ int rxe_qp_from_attr(struct rxe_qp *qp, struct ib_qp_attr *attr, int mask,
 		case IB_QPS_INIT:
 			rxe_dbg_qp(qp, "state -> INIT\n");
 			qp->req.state = QP_STATE_INIT;
-			qp->resp.state = QP_STATE_INIT;
 			qp->comp.state = QP_STATE_INIT;
 			break;
 
 		case IB_QPS_RTR:
 			rxe_dbg_qp(qp, "state -> RTR\n");
-			qp->resp.state = QP_STATE_READY;
 			break;
 
 		case IB_QPS_RTS:

drivers/infiniband/sw/rxe/rxe_recv.c

@@ -39,7 +39,7 @@ static int check_type_state(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
 	}
 
 	if (pkt->mask & RXE_REQ_MASK) {
-		if (unlikely(qp->resp.state != QP_STATE_READY))
+		if (unlikely(qp_state(qp) <= IB_QPS_RTR))
 			return -EINVAL;
 	} else if (unlikely(qp->req.state < QP_STATE_READY ||
 				qp->req.state > QP_STATE_DRAINED))

drivers/infiniband/sw/rxe/rxe_resp.c

@@ -1137,7 +1137,7 @@ static enum resp_states do_complete(struct rxe_qp *qp,
 		return RESPST_ERR_CQ_OVERFLOW;
 
 finish:
-	if (unlikely(qp->resp.state == QP_STATE_ERROR))
+	if (unlikely(qp_state(qp) == IB_QPS_ERR))
 		return RESPST_CHK_RESOURCE;
 	if (unlikely(!pkt))
 		return RESPST_DONE;
@@ -1464,10 +1464,10 @@ int rxe_responder(struct rxe_qp *qp)
 	struct rxe_pkt_info *pkt = NULL;
 	int ret;
 
-	if (!qp->valid || qp->resp.state == QP_STATE_ERROR ||
-	    qp->resp.state == QP_STATE_RESET) {
-		bool notify = qp->valid &&
-				(qp->resp.state == QP_STATE_ERROR);
+	if (!qp->valid || qp_state(qp) == IB_QPS_ERR ||
+	    qp_state(qp) == IB_QPS_RESET) {
+		bool notify = qp->valid && (qp_state(qp) == IB_QPS_ERR);
+
 		drain_req_pkts(qp);
 		flush_recv_queue(qp, notify);
 		goto exit;

drivers/infiniband/sw/rxe/rxe_verbs.c

@@ -1012,7 +1012,7 @@ static int rxe_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
 
 	spin_unlock_irqrestore(&rq->producer_lock, flags);
 
-	if (qp->resp.state == QP_STATE_ERROR)
+	if (qp_state(qp) == IB_QPS_ERR)
 		rxe_sched_task(&qp->resp.task);
 
 err_out:

drivers/infiniband/sw/rxe/rxe_verbs.h

@@ -173,7 +173,6 @@ struct resp_res {
 };
 
 struct rxe_resp_info {
-	enum rxe_qp_state	state;
 	u32			msn;
 	u32			psn;
 	u32			ack_psn;