From: Matteo Croce <mcroce@microsoft.com>
Date: Wed, 9 Jun 2021 17:23:03 +0000 (+0200)
Subject: stmmac: prefetch right address
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4744bf072b4640c5e2ea65c2361ad6c832f28fa8;p=linux.git

stmmac: prefetch right address

To support XDP, a headroom is prepended to the packet data.
Consider this offset when doing a prefetch.

Fixes: da5ec7f22a0f ("net: stmmac: refactor stmmac_init_rx_buffers for stmmac_reinit_rx_buffers")
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 1f817b1b890cf..180f347b4c8ee 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -5131,7 +5131,7 @@ read_again:
 
 		/* Buffer is good. Go on. */
 
-		prefetch(page_address(buf->page));
+		prefetch(page_address(buf->page) + buf->page_offset);
 		if (buf->sec_page)
 			prefetch(page_address(buf->sec_page));