[RFC 4/4] net: mvneta: move header prefetch in mvneta_swbm_rx_frame

[Lorenzo Bianconi]

Move data buffer prefetch in mvneta_swbm_rx_frame after
dma_sync_single_range_for_cpu

Signed-off-by: Ilias Apalodimas <ilias.apalodi...@linaro.org>
Signed-off-by: Jesper Dangaard Brouer <bro...@redhat.com>
Signed-off-by: Lorenzo Bianconi <lore...@kernel.org>
---
 drivers/net/ethernet/marvell/mvneta.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvneta.c 
b/drivers/net/ethernet/marvell/mvneta.c
index f2d12556efa8..e7ce08fe4ab1 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1979,11 +1979,8 @@ mvneta_swbm_rx_frame(struct mvneta_port *pp,
        struct net_device *dev = pp->dev;
        enum dma_data_direction dma_dir;
        struct xdp_buff xdp = {
-               .data_hard_start = data,
-               .data = data + MVNETA_SKB_HEADROOM,
                .rxq = &rxq->xdp_rxq,
        };
-       xdp_set_data_meta_invalid(&xdp);
 
        if (MVNETA_SKB_SIZE(rx_desc->data_size) > PAGE_SIZE) {
                len = MVNETA_MAX_RX_BUF_SIZE;
@@ -1992,13 +1989,20 @@ mvneta_swbm_rx_frame(struct mvneta_port *pp,
                len = rx_desc->data_size;
                data_len += (len - ETH_FCS_LEN);
        }
-       xdp.data_end = xdp.data + data_len;
 
        dma_dir = page_pool_get_dma_dir(rxq->page_pool);
        dma_sync_single_range_for_cpu(dev->dev.parent,
                                      rx_desc->buf_phys_addr, 0,
                                      len, dma_dir);
 
+       /* Prefetch header */
+       prefetch(data);
+
+       xdp.data_hard_start = data;
+       xdp.data = data + MVNETA_SKB_HEADROOM;
+       xdp.data_end = xdp.data + data_len;
+       xdp_set_data_meta_invalid(&xdp);
+
        if (xdp_prog) {
                int ret;
 
@@ -2083,15 +2087,11 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
        /* Fairness NAPI loop */
        while (rcvd_pkts < budget && rx_proc < rx_todo) {
                struct mvneta_rx_desc *rx_desc = mvneta_rxq_next_desc_get(rxq);
-               unsigned char *data;
                struct page *page;
                int index;
 
                index = rx_desc - rxq->descs;
                page = (struct page *)rxq->buf_virt_addr[index];
-               data = page_address(page);
-               /* Prefetch header */
-               prefetch(data);
 
                rxq->refill_num++;
                rcvd_pkts++;
-- 
2.21.0