[v1 36/43] net/dpaa2: support software taildrop

[vanshika.shukla@nxp.com]

From: Gagandeep Singh <g.singh@nxp.com>

Add software based taildrop support.

Signed-off-by: Gagandeep Singh <g.singh@nxp.com>
---
 drivers/bus/fslmc/portal/dpaa2_hw_pvt.h |  2 +-
 drivers/net/dpaa2/dpaa2_rxtx.c          | 24 +++++++++++++++++++++++-
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/fslmc/portal/dpaa2_hw_pvt.h b/drivers/bus/fslmc/portal/dpaa2_hw_pvt.h
index c5900bd06a..03b9088cc6 100644
--- a/drivers/bus/fslmc/portal/dpaa2_hw_pvt.h
+++ b/drivers/bus/fslmc/portal/dpaa2_hw_pvt.h
@@ -179,7 +179,7 @@ struct __rte_cache_aligned dpaa2_queue {
 	struct dpaa2_queue *tx_conf_queue;
 	int32_t eventfd;	/*!< Event Fd of this queue */
 	uint16_t nb_desc;
-	uint16_t resv;
+	uint16_t tm_sw_td;	/*!< TM software taildrop */
 	uint64_t offloads;
 	uint64_t lpbk_cntx;
 };
diff --git a/drivers/net/dpaa2/dpaa2_rxtx.c b/drivers/net/dpaa2/dpaa2_rxtx.c
index 4bb785aa49..065b219ffd 100644
--- a/drivers/net/dpaa2/dpaa2_rxtx.c
+++ b/drivers/net/dpaa2/dpaa2_rxtx.c
@@ -1297,8 +1297,11 @@ dpaa2_dev_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 		while (qbman_result_SCN_state(dpaa2_q->cscn)) {
 			retry_count++;
 			/* Retry for some time before giving up */
-			if (retry_count > CONG_RETRY_COUNT)
+			if (retry_count > CONG_RETRY_COUNT) {
+				if (dpaa2_q->tm_sw_td)
+					goto sw_td;
 				goto skip_tx;
+			}
 		}
 
 		frames_to_send = (nb_pkts > dpaa2_eqcr_size) ?
@@ -1490,6 +1493,25 @@ dpaa2_dev_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 			rte_pktmbuf_free_seg(buf_to_free[loop].seg);
 	}
 
+	return num_tx;
+sw_td:
+	loop = 0;
+	while (loop < num_tx) {
+		if (unlikely(RTE_MBUF_HAS_EXTBUF(*bufs)))
+			rte_pktmbuf_free(*bufs);
+		bufs++;
+		loop++;
+	}
+
+	/* free the pending buffers */
+	while (nb_pkts) {
+		rte_pktmbuf_free(*bufs);
+		bufs++;
+		nb_pkts--;
+		num_tx++;
+	}
+	dpaa2_q->tx_pkts += num_tx;
+
 	return num_tx;
 }
 
-- 
2.25.1