[dpdk-dev] [RFC 16/29] net/virtio: avoid touching packet data

[Tiwei Bie]

For performance testing purpose, avoid touching the packet data
when receiving packets.

Signed-off-by: Tiwei Bie <tiwei....@intel.com>
---
 drivers/net/virtio/virtio_rxtx.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index 3be64da..93d564f 100644
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -139,7 +139,9 @@ virtqueue_dequeue_burst_rx_1_0(struct virtqueue *vq, struct 
rte_mbuf **rx_pkts,
                }
 
                rte_prefetch0(cookie);
+#if 0
                rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
+#endif
                rx_pkts[i]  = cookie;
                vq->vq_used_cons_idx++;
                vq_ring_free_chain(vq, desc_idx);
@@ -174,7 +176,9 @@ virtqueue_dequeue_burst_rx_1_1(struct virtqueue *vq, struct 
rte_mbuf **rx_pkts,
                vq->vq_descx[used_idx].cookie = NULL;
 
                rte_prefetch0(cookie);
+#if 0
                rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
+#endif
                rx_pkts[i]  = cookie;
 
                vq->vq_used_cons_idx++;
@@ -568,7 +572,9 @@ static void
 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
 {
        uint32_t s = mbuf->pkt_len;
+#if 0
        struct ether_addr *ea;
+#endif
 
        if (s == 64) {
                stats->size_bins[1]++;
@@ -587,6 +593,7 @@ virtio_update_packet_stats(struct virtnet_stats *stats, 
struct rte_mbuf *mbuf)
                        stats->size_bins[7]++;
        }
 
+#if 0
        ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
        if (is_multicast_ether_addr(ea)) {
                if (is_broadcast_ether_addr(ea))
@@ -594,6 +601,7 @@ virtio_update_packet_stats(struct virtnet_stats *stats, 
struct rte_mbuf *mbuf)
                else
                        stats->multicast++;
        }
+#endif
 }
 
 /* Optionally fill offload information in structure */
-- 
2.7.4