RDMA/rxe: Move work queue code to subroutines

This patch:
	- Moves code to initialize a qp send work queue to a
	  subroutine named rxe_init_sq.
	- Moves code to initialize a qp recv work queue to a
	  subroutine named rxe_init_rq.
	- Moves initialization of qp request and response packet
	  queues ahead of work queue initialization so that cleanup
	  of a qp if it is not fully completed can successfully
	  attempt to drain the packet queues without a seg fault.
	- Makes minor whitespace cleanups.

Fixes: 8700e3e7 ("Soft RoCE driver")
Link: https://lore.kernel.org/r/20230620135519.9365-2-rpearsonhpe@gmail.comSigned-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Acked-by: Zhu Yanjun <zyjzyj2000@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rxe/rxe_qp.c

@@ -183,13 +183,63 @@ static void rxe_qp_init_misc(struct rxe_dev *rxe, struct rxe_qp *qp,
 	atomic_set(&qp->skb_out, 0);
 }
 
+static int rxe_init_sq(struct rxe_qp *qp, struct ib_qp_init_attr *init,
+		       struct ib_udata *udata,
+		       struct rxe_create_qp_resp __user *uresp)
+{
+	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
+	int wqe_size;
+	int err;
+
+	qp->sq.max_wr = init->cap.max_send_wr;
+	wqe_size = max_t(int, init->cap.max_send_sge * sizeof(struct ib_sge),
+			 init->cap.max_inline_data);
+	qp->sq.max_sge = wqe_size / sizeof(struct ib_sge);
+	qp->sq.max_inline = wqe_size;
+	wqe_size += sizeof(struct rxe_send_wqe);
+
+	qp->sq.queue = rxe_queue_init(rxe, &qp->sq.max_wr, wqe_size,
+				      QUEUE_TYPE_FROM_CLIENT);
+	if (!qp->sq.queue) {
+		rxe_err_qp(qp, "Unable to allocate send queue");
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	/* prepare info for caller to mmap send queue if user space qp */
+	err = do_mmap_info(rxe, uresp ? &uresp->sq_mi : NULL, udata,
+			   qp->sq.queue->buf, qp->sq.queue->buf_size,
+			   &qp->sq.queue->ip);
+	if (err) {
+		rxe_err_qp(qp, "do_mmap_info failed, err = %d", err);
+		goto err_free;
+	}
+
+	/* return actual capabilities to caller which may be larger
+	 * than requested
+	 */
+	init->cap.max_send_wr = qp->sq.max_wr;
+	init->cap.max_send_sge = qp->sq.max_sge;
+	init->cap.max_inline_data = qp->sq.max_inline;
+
+	return 0;
+
+err_free:
+	vfree(qp->sq.queue->buf);
+	kfree(qp->sq.queue);
+	qp->sq.queue = NULL;
+err_out:
+	return err;
+}
+
 static int rxe_qp_init_req(struct rxe_dev *rxe, struct rxe_qp *qp,
 			   struct ib_qp_init_attr *init, struct ib_udata *udata,
 			   struct rxe_create_qp_resp __user *uresp)
 {
 	int err;
-	int wqe_size;
-	enum queue_type type;
+
+	/* if we don't finish qp create make sure queue is valid */
+	skb_queue_head_init(&qp->req_pkts);
 
 	err = sock_create_kern(&init_net, AF_INET, SOCK_DGRAM, 0, &qp->sk);
 	if (err < 0)
@@ -204,32 +254,10 @@ static int rxe_qp_init_req(struct rxe_dev *rxe, struct rxe_qp *qp,
 	 * (0xc000 - 0xffff).
 	 */
 	qp->src_port = RXE_ROCE_V2_SPORT + (hash_32(qp_num(qp), 14) & 0x3fff);
-	qp->sq.max_wr		= init->cap.max_send_wr;
-
-	/* These caps are limited by rxe_qp_chk_cap() done by the caller */
-	wqe_size = max_t(int, init->cap.max_send_sge * sizeof(struct ib_sge),
-			 init->cap.max_inline_data);
-	qp->sq.max_sge = init->cap.max_send_sge =
-		wqe_size / sizeof(struct ib_sge);
-	qp->sq.max_inline = init->cap.max_inline_data = wqe_size;
-	wqe_size += sizeof(struct rxe_send_wqe);
-
-	type = QUEUE_TYPE_FROM_CLIENT;
-	qp->sq.queue = rxe_queue_init(rxe, &qp->sq.max_wr,
-				wqe_size, type);
-	if (!qp->sq.queue)
-		return -ENOMEM;
-
-	err = do_mmap_info(rxe, uresp ? &uresp->sq_mi : NULL, udata,
-			   qp->sq.queue->buf, qp->sq.queue->buf_size,
-			   &qp->sq.queue->ip);
 
-	if (err) {
-		vfree(qp->sq.queue->buf);
-		kfree(qp->sq.queue);
-		qp->sq.queue = NULL;
+	err = rxe_init_sq(qp, init, udata, uresp);
+	if (err)
 		return err;
-	}
 
 	qp->req.wqe_index = queue_get_producer(qp->sq.queue,
 					       QUEUE_TYPE_FROM_CLIENT);
@@ -248,36 +276,65 @@ static int rxe_qp_init_req(struct rxe_dev *rxe, struct rxe_qp *qp,
 	return 0;
 }
 
-static int rxe_qp_init_resp(struct rxe_dev *rxe, struct rxe_qp *qp,
-			    struct ib_qp_init_attr *init,
+static int rxe_init_rq(struct rxe_qp *qp, struct ib_qp_init_attr *init,
 		       struct ib_udata *udata,
 		       struct rxe_create_qp_resp __user *uresp)
 {
-	int err;
+	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 	int wqe_size;
-	enum queue_type type;
+	int err;
 
-	if (!qp->srq) {
 	qp->rq.max_wr = init->cap.max_recv_wr;
 	qp->rq.max_sge = init->cap.max_recv_sge;
+	wqe_size = sizeof(struct rxe_recv_wqe) +
+				qp->rq.max_sge*sizeof(struct ib_sge);
 
-		wqe_size = rcv_wqe_size(qp->rq.max_sge);
-
-		type = QUEUE_TYPE_FROM_CLIENT;
-		qp->rq.queue = rxe_queue_init(rxe, &qp->rq.max_wr,
-					wqe_size, type);
-		if (!qp->rq.queue)
-			return -ENOMEM;
+	qp->rq.queue = rxe_queue_init(rxe, &qp->rq.max_wr, wqe_size,
+				      QUEUE_TYPE_FROM_CLIENT);
+	if (!qp->rq.queue) {
+		rxe_err_qp(qp, "Unable to allocate recv queue");
+		err = -ENOMEM;
+		goto err_out;
+	}
 
+	/* prepare info for caller to mmap recv queue if user space qp */
 	err = do_mmap_info(rxe, uresp ? &uresp->rq_mi : NULL, udata,
 			   qp->rq.queue->buf, qp->rq.queue->buf_size,
 			   &qp->rq.queue->ip);
 	if (err) {
+		rxe_err_qp(qp, "do_mmap_info failed, err = %d", err);
+		goto err_free;
+	}
+
+	/* return actual capabilities to caller which may be larger
+	 * than requested
+	 */
+	init->cap.max_recv_wr = qp->rq.max_wr;
+
+	return 0;
+
+err_free:
 	vfree(qp->rq.queue->buf);
 	kfree(qp->rq.queue);
 	qp->rq.queue = NULL;
+err_out:
+	return err;
+}
+
+static int rxe_qp_init_resp(struct rxe_dev *rxe, struct rxe_qp *qp,
+			    struct ib_qp_init_attr *init,
+			    struct ib_udata *udata,
+			    struct rxe_create_qp_resp __user *uresp)
+{
+	int err;
+
+	/* if we don't finish qp create make sure queue is valid */
+	skb_queue_head_init(&qp->resp_pkts);
+
+	if (!qp->srq) {
+		err = rxe_init_rq(qp, init, udata, uresp);
+		if (err)
 			return err;
-		}
 	}
 
 	rxe_init_task(&qp->resp.task, qp, rxe_responder);