[PATCH v12 2/2] net/i40e: replace put function

[Dharmik Thakkar]

From: Kamalakshitha Aligeri <kamalakshitha.alig...@arm.com>

Integrated zero-copy put API in mempool cache in i40e PMD.
On Ampere Altra server, l3fwd single core's performance improves by 5%
with the new API

Signed-off-by: Kamalakshitha Aligeri <kamalakshitha.alig...@arm.com>
Signed-off-by: Dharmik Thakkar <dharmikjayesh.thak...@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.w...@arm.com>
Reviewed-by: Feifei Wang <feifei.wa...@arm.com>
Acked-by: Morten Brørup <m...@smartsharesystems.com>
Acked-by: Konstantin Ananyev <konstantin.v.anan...@yandex.ru>
---
 drivers/net/i40e/i40e_rxtx_vec_common.h | 29 ++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/net/i40e/i40e_rxtx_vec_common.h 
b/drivers/net/i40e/i40e_rxtx_vec_common.h
index fe1a6ec75ef5..bb746fc36823 100644
--- a/drivers/net/i40e/i40e_rxtx_vec_common.h
+++ b/drivers/net/i40e/i40e_rxtx_vec_common.h
@@ -85,7 +85,7 @@ i40e_tx_free_bufs(struct i40e_tx_queue *txq)
        uint32_t n;
        uint32_t i;
        int nb_free = 0;
-       struct rte_mbuf *m, *free[RTE_I40E_TX_MAX_FREE_BUF_SZ];
+       struct rte_mbuf *m, *free[RTE_I40E_TX_MAX_FREE_BUF_SZ] = {0};
 
        /* check DD bits on threshold descriptor */
        if ((txq->tx_ring[txq->tx_next_dd].cmd_type_offset_bsz &
@@ -95,18 +95,35 @@ i40e_tx_free_bufs(struct i40e_tx_queue *txq)
 
        n = txq->tx_rs_thresh;
 
-        /* first buffer to free from S/W ring is at index
-         * tx_next_dd - (tx_rs_thresh-1)
-         */
+       /* first buffer to free from S/W ring is at index
+        * tx_next_dd - (tx_rs_thresh-1)
+        */
        txep = &txq->sw_ring[txq->tx_next_dd - (n - 1)];
 
        if (txq->offloads & RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE) {
+               struct rte_mempool *mp = txep[0].mbuf->pool;
+               struct rte_mempool_cache *cache = rte_mempool_default_cache(mp, 
rte_lcore_id());
+               void **cache_objs;
+
+               if (unlikely(!cache))
+                       goto fallback;
+
+               cache_objs = rte_mempool_cache_zc_put_bulk(cache, mp, n);
+               if (unlikely(!cache_objs))
+                       goto fallback;
+
                for (i = 0; i < n; i++) {
-                       free[i] = txep[i].mbuf;
+                       cache_objs[i] = txep[i].mbuf;
                        /* no need to reset txep[i].mbuf in vector path */
                }
-               rte_mempool_put_bulk(free[0]->pool, (void **)free, n);
                goto done;
+
+fallback:
+               for (i = 0; i < n; i++)
+                       free[i] = txep[i].mbuf;
+               rte_mempool_generic_put(mp, (void **)free, n, cache);
+               goto done;
+
        }
 
        m = rte_pktmbuf_prefree_seg(txep[0].mbuf);
-- 
2.25.1