[dpdk-dev] [PATCH v3 1/5] net/fm10k: cleanup Tx buffers

[Chenxu Di <chenxux.di@intel.com>]

Add support to the fm10k driver for the API rte_eth_tx_done_cleanup
 to force free consumed buffers on Tx ring.

Signed-off-by: Chenxu Di <chenxux.di@intel.com>
---
 drivers/net/fm10k/fm10k.h        |  2 ++
 drivers/net/fm10k/fm10k_ethdev.c |  1 +
 drivers/net/fm10k/fm10k_rxtx.c   | 45 ++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+)

diff --git a/drivers/net/fm10k/fm10k.h b/drivers/net/fm10k/fm10k.h
index 916b856ac..ddb1d64ec 100644
--- a/drivers/net/fm10k/fm10k.h
+++ b/drivers/net/fm10k/fm10k.h
@@ -342,6 +342,8 @@ uint16_t fm10k_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 uint16_t fm10k_prep_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 	uint16_t nb_pkts);
 
+int fm10k_tx_done_cleanup(void *txq, uint32_t free_cnt);
+
 int fm10k_rxq_vec_setup(struct fm10k_rx_queue *rxq);
 int fm10k_rx_vec_condition_check(struct rte_eth_dev *);
 void fm10k_rx_queue_release_mbufs_vec(struct fm10k_rx_queue *rxq);
diff --git a/drivers/net/fm10k/fm10k_ethdev.c b/drivers/net/fm10k/fm10k_ethdev.c
index 407baa16c..c389c79de 100644
--- a/drivers/net/fm10k/fm10k_ethdev.c
+++ b/drivers/net/fm10k/fm10k_ethdev.c
@@ -2897,6 +2897,7 @@ static const struct eth_dev_ops fm10k_eth_dev_ops = {
 	.reta_query		= fm10k_reta_query,
 	.rss_hash_update	= fm10k_rss_hash_update,
 	.rss_hash_conf_get	= fm10k_rss_hash_conf_get,
+	.tx_done_cleanup    = fm10k_tx_done_cleanup,
 };
 
 static int ftag_check_handler(__rte_unused const char *key,
diff --git a/drivers/net/fm10k/fm10k_rxtx.c b/drivers/net/fm10k/fm10k_rxtx.c
index 5c3112183..f67c5bf00 100644
--- a/drivers/net/fm10k/fm10k_rxtx.c
+++ b/drivers/net/fm10k/fm10k_rxtx.c
@@ -541,6 +541,51 @@ static inline void tx_free_bulk_mbuf(struct rte_mbuf **txep, int num)
 	}
 }
 
+int fm10k_tx_done_cleanup(void *txq, uint32_t free_cnt)
+{
+	struct fm10k_tx_queue *q = (struct fm10k_tx_queue *)txq;
+	uint16_t next_rs, count = 0;
+
+	if (q == NULL)
+		return -ENODEV;
+
+	next_rs = fifo_peek(&q->rs_tracker);
+	if (!(q->hw_ring[next_rs].flags & FM10K_TXD_FLAG_DONE))
+		return count;
+
+	/* the DONE flag is set on this descriptor so remove the ID
+	 * from the RS bit tracker and free the buffers
+	 */
+	fifo_remove(&q->rs_tracker);
+
+	/* wrap around? if so, free buffers from last_free up to but NOT
+	 * including nb_desc
+	 */
+	if (q->last_free > next_rs) {
+		count = q->nb_desc - q->last_free;
+		tx_free_bulk_mbuf(&q->sw_ring[q->last_free], count);
+		q->last_free = 0;
+
+		if (unlikely(count == (int)free_cnt))
+			return count;
+	}
+
+	/* adjust free descriptor count before the next loop */
+	q->nb_free += count + (next_rs + 1 - q->last_free);
+
+	/* free buffers from last_free, up to and including next_rs */
+	if (q->last_free <= next_rs) {
+		count = next_rs - q->last_free + 1;
+		tx_free_bulk_mbuf(&q->sw_ring[q->last_free], count);
+		q->last_free += count;
+	}
+
+	if (q->last_free == q->nb_desc)
+		q->last_free = 0;
+
+	return count;
+}
+
 static inline void tx_free_descriptors(struct fm10k_tx_queue *q)
 {
 	uint16_t next_rs, count = 0;
-- 
2.17.1