From: karl beldan <karl.beldan@gmail.com>
Date: Mon, 15 Aug 2016 17:23:01 +0000 (+0000)
Subject: net: davinci_emac: Invalidate only the received portion of a buffer
X-Git-Url: http://git.ipfire.org/?p=people%2Fms%2Fu-boot.git;a=commitdiff_plain;h=a51897b6c1e517ea2ce95da59784e84c5992dd00

net: davinci_emac: Invalidate only the received portion of a buffer

ATM when receiving a packet the whole buffer is invalidated, this change
optimizes this behaviour.

Signed-off-by: Karl Beldan <karl.beldan+oss@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Mugunthan V N <mugunthanvnm@ti.com>
---

diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
index 187137c8b4..6283487708 100644
--- a/drivers/net/davinci_emac.c
+++ b/drivers/net/davinci_emac.c
@@ -681,12 +681,12 @@ static int davinci_eth_rcv_packet (struct eth_device *dev)
 			printf ("WARN: emac_rcv_pkt: Error in packet\n");
 		} else {
 			unsigned long tmp = (unsigned long)rx_curr_desc->buffer;
+			unsigned short len =
+				rx_curr_desc->buff_off_len & 0xffff;
 
-			invalidate_dcache_range(tmp, tmp + EMAC_RXBUF_SIZE);
-			net_process_received_packet(
-				rx_curr_desc->buffer,
-				rx_curr_desc->buff_off_len & 0xffff);
-			ret = rx_curr_desc->buff_off_len & 0xffff;
+			invalidate_dcache_range(tmp, tmp + ALIGN(len, PKTALIGN));
+			net_process_received_packet(rx_curr_desc->buffer, len);
+			ret = len;
 		}
 
 		/* Ack received packet descriptor */