[PATCH v2] net/i40e: reduce redundant store operation

[Feifei Wang]

For free buffer operation in i40e vector path, it is unnecessary to
store 'NULL' into txep.mbuf. This is because when putting mbuf into Tx
queue, tx_tail is the sentinel. And when doing tx_free, tx_next_dd is
the sentinel. In all processes, mbuf==NULL is not a condition in check.
Thus reset of mbuf is unnecessary and can be omitted.

Signed-off-by: Feifei Wang <feifei.wa...@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.w...@arm.com>
---

v2: remove the change for scalar path due to scalar path needs to check
whether the mbuf is 'NULL' to release and clean up (Haiyue)

 drivers/net/i40e/i40e_rxtx_vec_common.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_rxtx_vec_common.h 
b/drivers/net/i40e/i40e_rxtx_vec_common.h
index f9a7f46550..26deb59fc4 100644
--- a/drivers/net/i40e/i40e_rxtx_vec_common.h
+++ b/drivers/net/i40e/i40e_rxtx_vec_common.h
@@ -103,7 +103,6 @@ i40e_tx_free_bufs(struct i40e_tx_queue *txq)
        if (txq->offloads & RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE) {
                for (i = 0; i < n; i++) {
                        free[i] = txep[i].mbuf;
-                       txep[i].mbuf = NULL;
                }
                rte_mempool_put_bulk(free[0]->pool, (void **)free, n);
                goto done;
-- 
2.25.1