[dpdk-stable] patch 'net/dpaa2: fix the Tx handling of non HW pool bufs' has been queued to stable release 17.08.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 17.08.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/24/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 3c9a34563dbbc5b1fb908bbe453c06a1605f56cc Mon Sep 17 00:00:00 2001
From: Hemant Agrawal <hemant.agrawal at nxp.com>
Date: Sat, 16 Sep 2017 16:22:36 +0530
Subject: [PATCH] net/dpaa2: fix the Tx handling of non HW pool bufs

[ upstream commit 790ec226e9378c38b955c7cf1d2a57ef32568efd ]

The current code is sending 8 packet in each internal loop.
In some of the conditions, mbuf is being allocated or freed.
In case of error, the code is returning without taking care of
such buffer. It is better to send already prepared buffer and err
for the current failure only.

Fixes: 9e5f3e6d3658 ("net/dpaa2: handle non-hardware backed buffer pool")

Signed-off-by: Hemant Agrawal <hemant.agrawal at nxp.com>
---
 drivers/net/dpaa2/dpaa2_rxtx.c | 41 ++++++++++++++++++++++++-----------------
 1 file changed, 24 insertions(+), 17 deletions(-)

diff --git a/drivers/net/dpaa2/dpaa2_rxtx.c b/drivers/net/dpaa2/dpaa2_rxtx.c
index 3c057a3..b4cde2c 100644
--- a/drivers/net/dpaa2/dpaa2_rxtx.c
+++ b/drivers/net/dpaa2/dpaa2_rxtx.c
@@ -350,7 +350,6 @@ eth_copy_mbuf_to_fd(struct rte_mbuf *mbuf,
 	if (rte_dpaa2_mbuf_alloc_bulk(
 		rte_dpaa2_bpid_info[bpid].bp_list->mp, &mb, 1)) {
 		PMD_TX_LOG(WARNING, "Unable to allocated DPAA2 buffer");
-		rte_pktmbuf_free(mbuf);
 		return -1;
 	}
 	m = (struct rte_mbuf *)mb;
@@ -382,8 +381,6 @@ eth_copy_mbuf_to_fd(struct rte_mbuf *mbuf,
 		rte_dpaa2_bpid_info[DPAA2_GET_FD_BPID(fd)].meta_data_size,
 		DPAA2_GET_FD_OFFSET(fd),
 		DPAA2_GET_FD_LEN(fd));
-	/*free the original packet */
-	rte_pktmbuf_free(mbuf);
 
 	return 0;
 }
@@ -580,39 +577,35 @@ dpaa2_dev_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 				mp = mi->pool;
 			}
 			/* Not a hw_pkt pool allocated frame */
-			if (!mp) {
+			if (unlikely(!mp || !priv->bp_list)) {
 				PMD_TX_LOG(ERR, "err: no bpool attached");
-				goto skip_tx;
+				goto send_n_return;
 			}
+
 			if (mp->ops_index != priv->bp_list->dpaa2_ops_index) {
 				PMD_TX_LOG(ERR, "non hw offload bufffer ");
 				/* alloc should be from the default buffer pool
 				 * attached to this interface
 				 */
-				if (priv->bp_list) {
-					bpid = priv->bp_list->buf_pool.bpid;
-				} else {
-					PMD_TX_LOG(ERR,
-						   "err: no bpool attached");
-					num_tx = 0;
-					goto skip_tx;
-				}
+				bpid = priv->bp_list->buf_pool.bpid;
+
 				if (unlikely((*bufs)->nb_segs > 1)) {
 					PMD_TX_LOG(ERR, "S/G support not added"
 						" for non hw offload buffer");
-					goto skip_tx;
+					goto send_n_return;
 				}
 				if (eth_copy_mbuf_to_fd(*bufs,
 							&fd_arr[loop], bpid)) {
-					bufs++;
-					continue;
+					goto send_n_return;
 				}
+				/* free the original packet */
+				rte_pktmbuf_free(*bufs);
 			} else {
 				bpid = mempool_to_bpid(mp);
 				if (unlikely((*bufs)->nb_segs > 1)) {
 					if (eth_mbuf_to_sg_fd(*bufs,
 							&fd_arr[loop], bpid))
-						goto skip_tx;
+						goto send_n_return;
 				} else {
 					eth_mbuf_to_fd(*bufs,
 						       &fd_arr[loop], bpid);
@@ -630,6 +623,20 @@ dpaa2_dev_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 		dpaa2_q->tx_pkts += frames_to_send;
 		nb_pkts -= frames_to_send;
 	}
+	return num_tx;
+
+send_n_return:
+	/* send any already prepared fd */
+	if (loop) {
+		unsigned int i = 0;
+
+		while (i < loop) {
+			i += qbman_swp_enqueue_multiple(swp, &eqdesc,
+							&fd_arr[i], loop - i);
+		}
+		num_tx += loop;
+		dpaa2_q->tx_pkts += loop;
+	}
 skip_tx:
 	return num_tx;
 }
-- 
2.7.4