sky2: fix VLAN receive processing (resend)

The length check for truncated frames was not correctly handling
the case where VLAN acceleration had already read the tag.
Also, the Yukon EX has some features that use high bit of status
as security tag.

Signed-off-by: Pierre-Yves Ritschard <pyr@spootnik.org>
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 5d812de65d90a4d4467327ec675daf5d669d824c..8b1565453f087b1ca24c4fd42d947200268eba22 100644 (file)
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -2103,6 +2103,13 @@ static struct sk_buff *sky2_receive(struct net_device *dev,
        struct sky2_port *sky2 = netdev_priv(dev);
        struct rx_ring_info *re = sky2->rx_ring + sky2->rx_next;
        struct sk_buff *skb = NULL;
+       u16 count = (status & GMR_FS_LEN) >> 16;
+
+#ifdef SKY2_VLAN_TAG_USED
+       /* Account for vlan tag */
+       if (sky2->vlgrp && (status & GMR_FS_VLAN))
+               count -= VLAN_HLEN;
+#endif
 
        if (unlikely(netif_msg_rx_status(sky2)))
                printk(KERN_DEBUG PFX "%s: rx slot %u status 0x%x len %d\n",
@@ -2117,7 +2124,8 @@ static struct sk_buff *sky2_receive(struct net_device *dev,
        if (!(status & GMR_FS_RX_OK))
                goto resubmit;
 
-       if (status >> 16 != length)
+       /* if length reported by DMA does not match PHY, packet was truncated */
+       if (length != count)
                goto len_mismatch;
 
        if (length < copybreak)
@@ -2133,6 +2141,10 @@ len_mismatch:
        /* Truncation of overlength packets
           causes PHY length to not match MAC length */
        ++sky2->net_stats.rx_length_errors;
+       if (netif_msg_rx_err(sky2) && net_ratelimit())
+               pr_info(PFX "%s: rx length mismatch: length %d status %#x\n",
+                       dev->name, length, status);
+       goto resubmit;
 
 error:
        ++sky2->net_stats.rx_errors;

diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
index 72e12b7cfa40e27dd5af5e25e9294b416feef325..3baae48f80425d7ebed93885e62d7674a1cd2472 100644 (file)
--- a/drivers/net/sky2.h
+++ b/drivers/net/sky2.h
@@ -1668,7 +1668,7 @@ enum {
 
 /* Receive Frame Status Encoding */
 enum {
-       GMR_FS_LEN      = 0xffff<<16, /* Bit 31..16:    Rx Frame Length */
+       GMR_FS_LEN      = 0x7fff<<16, /* Bit 30..16:    Rx Frame Length */
        GMR_FS_VLAN     = 1<<13, /* VLAN Packet */
        GMR_FS_JABBER   = 1<<12, /* Jabber Packet */
        GMR_FS_UN_SIZE  = 1<<11, /* Undersize Packet */