Subject: [PATCH 08/12] sky2: check drop truncated packets

From: Stephen Hemminger <[email-masked]>
Date: Mon, 09 Jul 2007 15:33:40 -0700

If packet larger than MTU is received, the driver uses hardware to
truncate the packet. Use the status registers to catch/drop them.

Signed-off-by: Stephen Hemminger <[email-masked]>

--- a/drivers/net/sky2.c	2007-07-09 15:30:12.000000000 -0700
+++ b/drivers/net/sky2.c	2007-07-09 15:30:12.000000000 -0700
@@ -2109,6 +2109,9 @@ static struct sk_buff *sky2_receive(stru
 	if (!(status & GMR_FS_RX_OK))
 		goto resubmit;
 
+	if (status >> 16 != length)
+		goto len_mismatch;
+
 	if (length < copybreak)
 		skb = receive_copy(sky2, re, length);
 	else
@@ -2118,6 +2121,11 @@ resubmit:
 
 	return skb;
 
+len_mismatch:
+	/* Truncation of overlength packets
+	   causes PHY length to not match MAC length */
+	++sky2->net_stats.rx_length_errors;
+
 error:
 	++sky2->net_stats.rx_errors;
 	if (status & GMR_FS_RX_FF_OV) {

-- 
Stephen Hemminger <[email-masked]>