net/qede: remove prefetch in Tx path

Incorrect placement of prefetch in Tx path is causing
a performance drop of around ~2% on AMD platform.

Fixes: 2ea6f76aff40 ("qede: add core driver")
Cc: stable@dpdk.org
Signed-off-by: Shahed Shaikh <shshaikh@marvell.com>
Acked-by: Rasesh Mody <rmody@marvell.com>

diff --git a/drivers/net/qede/qede_rxtx.c b/drivers/net/qede/qede_rxtx.c
index 684c4ae..eda19b2 100644 (file)
--- a/drivers/net/qede/qede_rxtx.c
+++ b/drivers/net/qede/qede_rxtx.c
@@ -2181,7 +2181,6 @@ qede_xmit_pkts(void *p_txq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 
                txq->nb_tx_avail -= bd1->data.nbds;
                txq->sw_tx_prod++;
-               rte_prefetch0(txq->sw_tx_ring[TX_PROD(txq)].mbuf);
                bd_prod =
                    rte_cpu_to_le_16(ecore_chain_get_prod_idx(&txq->tx_pbl));
 #ifdef RTE_LIBRTE_QEDE_DEBUG_TX