[dpdk-dev] [PATCH 4/4] net/ixgbe: cleanup Tx buffers

[Di ChenxuX]

Add support to the ixgbe driver for the API rte_eth_tx_done_cleanup
 to force free consumed buffers on Tx ring.

Signed-off-by: Di ChenxuX <chenxux.di at intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c |  2 ++
 drivers/net/ixgbe/ixgbe_rxtx.c   | 39 ++++++++++++++++++++++++++++++++
 drivers/net/ixgbe/ixgbe_rxtx.h   |  2 ++
 3 files changed, 43 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 7eb3d0567..255af2290 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -591,6 +591,7 @@ static const struct eth_dev_ops ixgbe_eth_dev_ops = {
 	.udp_tunnel_port_add  = ixgbe_dev_udp_tunnel_port_add,
 	.udp_tunnel_port_del  = ixgbe_dev_udp_tunnel_port_del,
 	.tm_ops_get           = ixgbe_tm_ops_get,
+	.tx_done_cleanup      = ixgbe_tx_done_cleanup,
 };
 
 /*
@@ -639,6 +640,7 @@ static const struct eth_dev_ops ixgbevf_eth_dev_ops = {
 	.reta_query           = ixgbe_dev_rss_reta_query,
 	.rss_hash_update      = ixgbe_dev_rss_hash_update,
 	.rss_hash_conf_get    = ixgbe_dev_rss_hash_conf_get,
+	.tx_done_cleanup      = ixgbe_tx_done_cleanup,
 };
 
 /* store statistics names and its offset in stats structure */
diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
index edcfa60ce..7bdb244b0 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx.c
@@ -2306,6 +2306,45 @@ ixgbe_tx_queue_release_mbufs(struct ixgbe_tx_queue *txq)
 	}
 }
 
+int ixgbe_tx_done_cleanup(void *txq, uint32_t free_cnt)
+{
+	struct ixgbe_tx_queue *q = (struct ixgbe_tx_queue *)txq;
+	struct ixgbe_tx_entry *sw_ring;
+	uint16_t tx_id;    /* Current segment being processed. */
+	uint16_t tx_cleaned;
+
+	int count = 0;
+
+	if (q == NULL)
+		return -ENODEV;
+
+	sw_ring = q->sw_ring;
+	tx_cleaned = q->last_desc_cleaned;
+	tx_id = sw_ring[q->last_desc_cleaned].next_id;
+	if (!(q->tx_ring[tx_id].wb.status &
+			IXGBE_TXD_STAT_DD))
+		return 0;
+
+	do {
+		if (sw_ring[tx_id].mbuf == NULL)
+			break;
+
+		rte_pktmbuf_free_seg(sw_ring[tx_id].mbuf);
+		sw_ring[tx_id].mbuf = NULL;
+		sw_ring[tx_id].last_id = tx_id;
+
+		/* Move to next segemnt. */
+		tx_cleaned = tx_id;
+		tx_id = sw_ring[tx_id].next_id;
+		count++;
+	} while (count != (int)free_cnt);
+
+	q->nb_tx_free += (uint16_t)count;
+	q->last_desc_cleaned = tx_cleaned;
+
+	return count;
+}
+
 static void __attribute__((cold))
 ixgbe_tx_free_swring(struct ixgbe_tx_queue *txq)
 {
diff --git a/drivers/net/ixgbe/ixgbe_rxtx.h b/drivers/net/ixgbe/ixgbe_rxtx.h
index 505d344b9..2c3770af6 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx.h
+++ b/drivers/net/ixgbe/ixgbe_rxtx.h
@@ -285,6 +285,8 @@ int ixgbe_rx_vec_dev_conf_condition_check(struct rte_eth_dev *dev);
 int ixgbe_rxq_vec_setup(struct ixgbe_rx_queue *rxq);
 void ixgbe_rx_queue_release_mbufs_vec(struct ixgbe_rx_queue *rxq);
 
+int ixgbe_tx_done_cleanup(void *txq, uint32_t free_cnt);
+
 extern const uint32_t ptype_table[IXGBE_PACKET_TYPE_MAX];
 extern const uint32_t ptype_table_tn[IXGBE_PACKET_TYPE_TN_MAX];
 
-- 
2.17.1