[PATCH 05/15] net/dpaa2: check free enqueue descriptors before Tx

[Gagandeep Singh <g.singh@nxp.com>]

From: brick <brick.yang@nxp.com>

Check if there exists free enqueue descriptors before enqueuing Tx
packet. Also try to free enqueue descriptors in case they are not
free.

Fixes: ed1cdbed6a15 ("net/dpaa2: support multiple Tx queues enqueue for ordered")
Cc: stable@dpdk.org

Signed-off-by: brick <brick.yang@nxp.com>
Signed-off-by: Rohit Raj <rohit.raj@nxp.com>
---
 drivers/event/dpaa2/dpaa2_eventdev.c |  8 ++---
 drivers/net/dpaa2/dpaa2_rxtx.c       | 50 +++++++++++++++++++---------
 2 files changed, 38 insertions(+), 20 deletions(-)

diff --git a/drivers/event/dpaa2/dpaa2_eventdev.c b/drivers/event/dpaa2/dpaa2_eventdev.c
index 1001297cda..d09c5b8778 100644
--- a/drivers/event/dpaa2/dpaa2_eventdev.c
+++ b/drivers/event/dpaa2/dpaa2_eventdev.c
@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: BSD-3-Clause
- * Copyright 2017,2019-2021 NXP
+ * Copyright 2017,2019-2022 NXP
  */
 
 #include <assert.h>
@@ -175,7 +175,7 @@ dpaa2_eventdev_enqueue_burst(void *port, const struct rte_event ev[],
 				if (retry_count > DPAA2_EV_TX_RETRY_COUNT) {
 					num_tx += loop;
 					nb_events -= loop;
-					return num_tx + loop;
+					return num_tx;
 				}
 			} else {
 				loop += ret;
@@ -1015,9 +1015,7 @@ dpaa2_eventdev_txa_enqueue(void *port,
 		txq[i] = rte_eth_devices[m[i]->port].data->tx_queues[qid];
 	}
 
-	dpaa2_dev_tx_multi_txq_ordered(txq, m, nb_events);
-
-	return nb_events;
+	return dpaa2_dev_tx_multi_txq_ordered(txq, m, nb_events);
 }
 
 static struct eventdev_ops dpaa2_eventdev_ops = {
diff --git a/drivers/net/dpaa2/dpaa2_rxtx.c b/drivers/net/dpaa2/dpaa2_rxtx.c
index 9436a95ac8..bc0e49b0d4 100644
--- a/drivers/net/dpaa2/dpaa2_rxtx.c
+++ b/drivers/net/dpaa2/dpaa2_rxtx.c
@@ -1525,7 +1525,7 @@ dpaa2_dev_tx_multi_txq_ordered(void **queue,
 	uint32_t loop, retry_count;
 	int32_t ret;
 	struct qbman_fd fd_arr[MAX_TX_RING_SLOTS];
-	uint32_t frames_to_send;
+	uint32_t frames_to_send, num_free_eq_desc = 0;
 	struct rte_mempool *mp;
 	struct qbman_eq_desc eqdesc[MAX_TX_RING_SLOTS];
 	struct dpaa2_queue *dpaa2_q[MAX_TX_RING_SLOTS];
@@ -1547,16 +1547,44 @@ dpaa2_dev_tx_multi_txq_ordered(void **queue,
 	}
 	swp = DPAA2_PER_LCORE_PORTAL;
 
-	for (loop = 0; loop < nb_pkts; loop++) {
+	frames_to_send = (nb_pkts > dpaa2_eqcr_size) ?
+		dpaa2_eqcr_size : nb_pkts;
+
+	for (loop = 0; loop < frames_to_send; loop++) {
 		dpaa2_q[loop] = (struct dpaa2_queue *)queue[loop];
 		eth_data = dpaa2_q[loop]->eth_data;
 		priv = eth_data->dev_private;
+		if (!priv->en_loose_ordered) {
+			if (*dpaa2_seqn(*bufs) & DPAA2_ENQUEUE_FLAG_ORP) {
+				if (!num_free_eq_desc) {
+					num_free_eq_desc = dpaa2_free_eq_descriptors();
+					if (!num_free_eq_desc)
+						goto send_frames;
+				}
+				num_free_eq_desc--;
+			}
+		}
+
+		DPAA2_PMD_DP_DEBUG("===> eth_data =%p, fqid =%d\n",
+				   eth_data, dpaa2_q[loop]->fqid);
+
+		/*Check if the queue is congested*/
+		retry_count = 0;
+		while (qbman_result_SCN_state(dpaa2_q[loop]->cscn)) {
+			retry_count++;
+			/* Retry for some time before giving up */
+			if (retry_count > CONG_RETRY_COUNT)
+				goto send_frames;
+		}
+
+		/*Prepare enqueue descriptor*/
 		qbman_eq_desc_clear(&eqdesc[loop]);
+
 		if (*dpaa2_seqn(*bufs) && priv->en_ordered) {
 			order_sendq = (struct dpaa2_queue *)priv->tx_vq[0];
 			dpaa2_set_enqueue_descriptor(order_sendq,
-							     (*bufs),
-							     &eqdesc[loop]);
+						     (*bufs),
+						     &eqdesc[loop]);
 		} else {
 			qbman_eq_desc_set_no_orp(&eqdesc[loop],
 							 DPAA2_EQ_RESP_ERR_FQ);
@@ -1564,14 +1592,6 @@ dpaa2_dev_tx_multi_txq_ordered(void **queue,
 						     dpaa2_q[loop]->fqid);
 		}
 
-		retry_count = 0;
-		while (qbman_result_SCN_state(dpaa2_q[loop]->cscn)) {
-			retry_count++;
-			/* Retry for some time before giving up */
-			if (retry_count > CONG_RETRY_COUNT)
-				goto send_frames;
-		}
-
 		if (likely(RTE_MBUF_DIRECT(*bufs))) {
 			mp = (*bufs)->pool;
 			/* Check the basic scenario and set
@@ -1591,7 +1611,6 @@ dpaa2_dev_tx_multi_txq_ordered(void **queue,
 					&fd_arr[loop],
 					mempool_to_bpid(mp));
 				bufs++;
-				dpaa2_q[loop]++;
 				continue;
 			}
 		} else {
@@ -1637,18 +1656,19 @@ dpaa2_dev_tx_multi_txq_ordered(void **queue,
 		}
 
 		bufs++;
-		dpaa2_q[loop]++;
 	}
 
 send_frames:
 	frames_to_send = loop;
 	loop = 0;
+	retry_count = 0;
 	while (loop < frames_to_send) {
 		ret = qbman_swp_enqueue_multiple_desc(swp, &eqdesc[loop],
 				&fd_arr[loop],
 				frames_to_send - loop);
 		if (likely(ret > 0)) {
 			loop += ret;
+			retry_count = 0;
 		} else {
 			retry_count++;
 			if (retry_count > DPAA2_MAX_TX_RETRY_COUNT)
@@ -1834,7 +1854,7 @@ dpaa2_dev_tx_ordered(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 		retry_count = 0;
 		while (i < loop) {
 			ret = qbman_swp_enqueue_multiple_desc(swp,
-				       &eqdesc[loop], &fd_arr[i], loop - i);
+				       &eqdesc[i], &fd_arr[i], loop - i);
 			if (unlikely(ret < 0)) {
 				retry_count++;
 				if (retry_count > DPAA2_MAX_TX_RETRY_COUNT)
-- 
2.25.1