[dpdk-stable] [PATCH 2/2] app/testpmd: fix missing prefetch in macswap mode

[Yongseok Koh]

Prefetching packet was missing when do_macswap() was optimized.

Fixes: 62b52877adbe ("app/testpmd: batch MAC swap for performance on x86")
Cc: qi.z.zhang at intel.com
Cc: stable at dpdk.org

Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
---
 app/test-pmd/macswap_sse.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/app/test-pmd/macswap_sse.h b/app/test-pmd/macswap_sse.h
index 662fe79cf9..2b6e7324da 100644
--- a/app/test-pmd/macswap_sse.h
+++ b/app/test-pmd/macswap_sse.h
@@ -35,6 +35,13 @@ do_macswap(struct rte_mbuf *pkts[], uint16_t nb,
 	r = nb;
 
 	while (r >= 4) {
+		if (r >= 8) {
+			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 4], void *));
+			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 5], void *));
+			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 6], void *));
+			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 7], void *));
+		}
+
 		mb[0] = pkts[i++];
 		eth_hdr[0] = rte_pktmbuf_mtod(mb[0], struct ether_hdr *);
 		addr0 = _mm_loadu_si128((__m128i *)eth_hdr[0]);
-- 
2.11.0