openwrt/target/linux/mvebu/patches-5.4/014-net-mvneta-move-header-prefetch-in-mvneta_swbm_rx_fr.patch

From 8abaeebfa7ef9a5600f4f596d2e94aa253f47553 Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Sat, 19 Oct 2019 10:13:25 +0200
Subject: [PATCH 5/7] net: mvneta: move header prefetch in mvneta_swbm_rx_frame

Move data buffer prefetch in mvneta_swbm_rx_frame after
dma_sync_single_range_for_cpu

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/marvell/mvneta.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -2036,6 +2036,9 @@ mvneta_swbm_rx_frame(struct mvneta_port
 				rx_desc->buf_phys_addr,
 				len, dma_dir);
 
+	/* Prefetch header */
+	prefetch(data);
+
 	xdp->data_hard_start = data;
 	xdp->data = data + MVNETA_SKB_HEADROOM + MVNETA_MH_SIZE;
 	xdp->data_end = xdp->data + data_len;
@@ -2133,14 +2136,10 @@ static int mvneta_rx_swbm(struct napi_st
 	while (rx_proc < budget && rx_proc < rx_todo) {
 		struct mvneta_rx_desc *rx_desc = mvneta_rxq_next_desc_get(rxq);
 		u32 rx_status, index;
-		unsigned char *data;
 		struct page *page;
 
 		index = rx_desc - rxq->descs;
 		page = (struct page *)rxq->buf_virt_addr[index];
-		data = page_address(page);
-		/* Prefetch header */
-		prefetch(data);
 
 		rx_status = rx_desc->status;
 		rx_proc++;