sky2: check drop truncated packets

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 <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 99a999383e9b..4e0b839de7e4 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -2109,6 +2109,9 @@ static struct sk_buff *sky2_receive(struct net_device *dev,
         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) {