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authorStephen Hemminger <shemminger@linux-foundation.org>2007-09-19 15:36:42 -0700
committerJeff Garzik <jeff@garzik.org>2007-09-20 15:22:59 -0400
commitd6532232cd3de79c852685823a9c52f723816d0a (patch)
treeff6fc85a36020202709dfb915a60f6941585b9e7
parent680e9fe9d69ea86e81c859932bfd751be91cc0e0 (diff)
downloadlinux-2.6.34-ux500-d6532232cd3de79c852685823a9c52f723816d0a.tar.gz
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>
-rw-r--r--drivers/net/sky2.c14
-rw-r--r--drivers/net/sky2.h2
2 files changed, 14 insertions, 2 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 5d812de65d9..8b1565453f0 100644
--- 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 72e12b7cfa4..3baae48f804 100644
--- 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 */