RDMA/rxe: Split qp state for requester and completer

Currently the requester can continue to process send wqes after an local
qp operation error is detected because the setting of the qp state to the
error state is deferred until later. This patch splits the qp state for
the completer and requester into two separate states and sets
qp->req.state = QP_STATE_ERROR as soon as the error is detected before
another wqe can be executed.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bob Pearson <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

Author: Bob Pearson

drivers/infiniband/sw/rxe/rxe_comp.c

@@ -567,10 +567,10 @@ int rxe_completer(void *arg)
 	if (!rxe_get(qp))
 		return -EAGAIN;
 
-	if (!qp->valid || qp->req.state == QP_STATE_ERROR ||
-	    qp->req.state == QP_STATE_RESET) {
+	if (!qp->valid || qp->comp.state == QP_STATE_ERROR ||
+	    qp->comp.state == QP_STATE_RESET) {
 		rxe_drain_resp_pkts(qp, qp->valid &&
-				    qp->req.state == QP_STATE_ERROR);
+				    qp->comp.state == QP_STATE_ERROR);
 		goto exit;
 	}
 

drivers/infiniband/sw/rxe/rxe_qp.c

@@ -228,6 +228,7 @@ static int rxe_qp_init_req(struct rxe_dev *rxe, struct rxe_qp *qp,
 					       QUEUE_TYPE_FROM_CLIENT);
 
 	qp->req.state		= QP_STATE_RESET;
+	qp->comp.state		= QP_STATE_RESET;
 	qp->req.opcode		= -1;
 	qp->comp.opcode		= -1;
 
@@ -488,6 +489,7 @@ 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;
 
 	/* let state machines reset themselves drain work and packet queues
@@ -551,6 +553,7 @@ 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;
 
 	/* drain work and packet queues */
@@ -688,6 +691,7 @@ int rxe_qp_from_attr(struct rxe_qp *qp, struct ib_qp_attr *attr, int mask,
 			pr_debug("qp#%d state -> INIT\n", qp_num(qp));
 			qp->req.state = QP_STATE_INIT;
 			qp->resp.state = QP_STATE_INIT;
+			qp->comp.state = QP_STATE_INIT;
 			break;
 
 		case IB_QPS_RTR:
@@ -698,6 +702,7 @@ int rxe_qp_from_attr(struct rxe_qp *qp, struct ib_qp_attr *attr, int mask,
 		case IB_QPS_RTS:
 			pr_debug("qp#%d state -> RTS\n", qp_num(qp));
 			qp->req.state = QP_STATE_READY;
+			qp->comp.state = QP_STATE_READY;
 			break;
 
 		case IB_QPS_SQD:

drivers/infiniband/sw/rxe/rxe_req.c

@@ -816,6 +816,7 @@ int rxe_requester(void *arg)
 	/* update wqe_index for each wqe completion */
 	qp->req.wqe_index = queue_next_index(qp->sq.queue, qp->req.wqe_index);
 	wqe->state = wqe_state_error;
+	qp->req.state = QP_STATE_ERROR;
 	rxe_run_task(&qp->comp.task, 0);
 exit:
 	ret = -EAGAIN;

drivers/infiniband/sw/rxe/rxe_verbs.h

@@ -129,6 +129,7 @@ struct rxe_req_info {
 };
 
 struct rxe_comp_info {
+	enum rxe_qp_state	state;
 	u32			psn;
 	int			opcode;
 	int			timeout;