netdev - [PATCH 1/6] netdev: bfin_mac: handler RX status errors

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Date:	Tue, 19 Jan 2010 06:08:22 -0500
From:	Mike Frysinger <vapier@...too.org>
To:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Cc:	uclinux-dist-devel@...ckfin.uclinux.org,
	Peter Meerwald <pmeerw@...erw.net>,
	Graf Yang <graf.yang@...log.com>
Subject: [PATCH 1/6] netdev: bfin_mac: handler RX status errors

From: Peter Meerwald <pmeerw@...erw.net>

Signed-off-by: Peter Meerwald <pmeerw@...erw.net>
Signed-off-by: Graf Yang <graf.yang@...log.com>
Signed-off-by: Mike Frysinger <vapier@...too.org>
---
 drivers/net/bfin_mac.c |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index 0b23bc4..e0fe9d0 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c
@@ -660,11 +660,24 @@ out:
 	return NETDEV_TX_OK;
 }
 
+#define RX_ERROR_MASK (RX_LONG | RX_ALIGN | RX_CRC | RX_LEN | \
+	RX_FRAG | RX_ADDR | RX_DMAO | RX_PHY | RX_LATE | RX_RANGE)
+
 static void bfin_mac_rx(struct net_device *dev)
 {
 	struct sk_buff *skb, *new_skb;
 	unsigned short len;
 
+	/* check if frame status word reports an error condition
+	 * we which case we simply drop the packet
+	 */
+	if (current_rx_ptr->status.status_word & RX_ERROR_MASK) {
+		printk(KERN_NOTICE DRV_NAME
+		       ": rx: receive error - packet dropped\n");
+		dev->stats.rx_dropped++;
+		goto out;
+	}
+
 	/* allocate a new skb for next time receive */
 	skb = current_rx_ptr->skb;
 	new_skb = dev_alloc_skb(PKT_BUF_SZ + NET_IP_ALIGN);
@@ -699,11 +712,9 @@ static void bfin_mac_rx(struct net_device *dev)
 	netif_rx(skb);
 	dev->stats.rx_packets++;
 	dev->stats.rx_bytes += len;
+out:
 	current_rx_ptr->status.status_word = 0x00000000;
 	current_rx_ptr = current_rx_ptr->next;
-
-out:
-	return;
 }
 
 /* interrupt routine to handle rx and error signal */
-- 
1.6.6

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