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 c84ec8c..b82017e 100644 (file)
--- 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