From: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Date: Thu, 3 Mar 2016 14:27:15 +0000 (+0100)
Subject: mlx5: avoid lkey retrieval for inlined packets
X-Git-Tag: spdx-start~7306
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=d970e99260bf77f40d8e1712a683f1455c4f92d3;p=dpdk.git

mlx5: avoid lkey retrieval for inlined packets

Improves performance as the lkey is not needed by hardware in this case.

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
---

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index c84ec8cf38..b82017eedf 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -512,16 +512,6 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 			/* Retrieve buffer information. */
 			addr = rte_pktmbuf_mtod(buf, uintptr_t);
 			length = DATA_LEN(buf);
-			/* Retrieve Memory Region key for this memory pool. */
-			lkey = txq_mp2mr(txq, txq_mb2mp(buf));
-			if (unlikely(lkey == (uint32_t)-1)) {
-				/* MR does not exist. */
-				DEBUG("%p: unable to get MP <-> MR"
-				      " association", (void *)txq);
-				/* Clean up TX element. */
-				elt->buf = NULL;
-				goto stop;
-			}
 			/* Update element. */
 			elt->buf = buf;
 			if (txq->priv->vf)
@@ -545,12 +535,25 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 					 send_flags);
 			else
 #endif
+			{
+				/* Retrieve Memory Region key for this
+				 * memory pool. */
+				lkey = txq_mp2mr(txq, txq_mb2mp(buf));
+				if (unlikely(lkey == (uint32_t)-1)) {
+					/* MR does not exist. */
+					DEBUG("%p: unable to get MP <-> MR"
+					      " association", (void *)txq);
+					/* Clean up TX element. */
+					elt->buf = NULL;
+					goto stop;
+				}
 				err = txq->send_pending
 					(txq->qp,
 					 addr,
 					 length,
 					 lkey,
 					 send_flags);
+			}
 			if (unlikely(err))
 				goto stop;
 #ifdef MLX5_PMD_SOFT_COUNTERS