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authorstephen hemminger <shemminger@vyatta.com>2012-04-30 06:47:37 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-12 09:32:18 -0700
commitbff12743574b49347d43393c29cb7c5e8dc8af5a (patch)
tree62a537a4c1cfb165d5c9bdea366369b1917e9125
parentbd920c58f390f5e76e5456d395adeccd3fb1e53d (diff)
sky2: fix receive length error in mixed non-VLAN/VLAN traffic
[ Upstream commit e072b3fad5f3915102c94628b4971f52ff99dd05 ] Bug: The VLAN bit of the MAC RX Status Word is unreliable in several older supported chips. Sometimes the VLAN bit is not set for valid VLAN packets and also sometimes the VLAN bit is set for non-VLAN packets that came after a VLAN packet. This results in a receive length error when VLAN hardware tagging is enabled. Fix: Variation on original fix proposed by Mirko. The VLAN information is decoded in the status loop, and can be applied to the received SKB there. This eliminates the need for the separate tag field in the interface data structure. The tag has to be copied and cleared if packet is copied. This version checked out with vlan and normal traffic. Note: vlan_tx_tag_present should be renamed vlan_tag_present, but that is outside scope of this. Reported-by: Mirko Lindner <mlindner@marvell.com> Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/ethernet/marvell/sky2.c28
-rw-r--r--drivers/net/ethernet/marvell/sky2.h1
2 files changed, 17 insertions, 12 deletions
diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
index 0604aeb66a6d..1d04182e069c 100644
--- a/drivers/net/ethernet/marvell/sky2.c
+++ b/drivers/net/ethernet/marvell/sky2.c
@@ -2484,9 +2484,11 @@ static struct sk_buff *receive_copy(struct sky2_port *sky2,
skb->ip_summed = re->skb->ip_summed;
skb->csum = re->skb->csum;
skb->rxhash = re->skb->rxhash;
+ skb->vlan_tci = re->skb->vlan_tci;
pci_dma_sync_single_for_device(sky2->hw->pdev, re->data_addr,
length, PCI_DMA_FROMDEVICE);
+ re->skb->vlan_tci = 0;
re->skb->rxhash = 0;
re->skb->ip_summed = CHECKSUM_NONE;
skb_put(skb, length);
@@ -2572,9 +2574,6 @@ static struct sk_buff *sky2_receive(struct net_device *dev,
struct sk_buff *skb = NULL;
u16 count = (status & GMR_FS_LEN) >> 16;
- if (status & GMR_FS_VLAN)
- count -= VLAN_HLEN; /* Account for vlan tag */
-
netif_printk(sky2, rx_status, KERN_DEBUG, dev,
"rx slot %u status 0x%x len %d\n",
sky2->rx_next, status, length);
@@ -2582,6 +2581,9 @@ static struct sk_buff *sky2_receive(struct net_device *dev,
sky2->rx_next = (sky2->rx_next + 1) % sky2->rx_pending;
prefetch(sky2->rx_ring + sky2->rx_next);
+ if (vlan_tx_tag_present(re->skb))
+ count -= VLAN_HLEN; /* Account for vlan tag */
+
/* This chip has hardware problems that generates bogus status.
* So do only marginal checking and expect higher level protocols
* to handle crap frames.
@@ -2639,11 +2641,8 @@ static inline void sky2_tx_done(struct net_device *dev, u16 last)
}
static inline void sky2_skb_rx(const struct sky2_port *sky2,
- u32 status, struct sk_buff *skb)
+ struct sk_buff *skb)
{
- if (status & GMR_FS_VLAN)
- __vlan_hwaccel_put_tag(skb, be16_to_cpu(sky2->rx_tag));
-
if (skb->ip_summed == CHECKSUM_NONE)
netif_receive_skb(skb);
else
@@ -2697,6 +2696,14 @@ static void sky2_rx_checksum(struct sky2_port *sky2, u32 status)
}
}
+static void sky2_rx_tag(struct sky2_port *sky2, u16 length)
+{
+ struct sk_buff *skb;
+
+ skb = sky2->rx_ring[sky2->rx_next].skb;
+ __vlan_hwaccel_put_tag(skb, be16_to_cpu(length));
+}
+
static void sky2_rx_hash(struct sky2_port *sky2, u32 status)
{
struct sk_buff *skb;
@@ -2755,8 +2762,7 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
}
skb->protocol = eth_type_trans(skb, dev);
-
- sky2_skb_rx(sky2, status, skb);
+ sky2_skb_rx(sky2, skb);
/* Stop after net poll weight */
if (++work_done >= to_do)
@@ -2764,11 +2770,11 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
break;
case OP_RXVLAN:
- sky2->rx_tag = length;
+ sky2_rx_tag(sky2, length);
break;
case OP_RXCHKSVLAN:
- sky2->rx_tag = length;
+ sky2_rx_tag(sky2, length);
/* fall through */
case OP_RXCHKS:
if (likely(dev->features & NETIF_F_RXCSUM))
diff --git a/drivers/net/ethernet/marvell/sky2.h b/drivers/net/ethernet/marvell/sky2.h
index ff6f58bf822a..3c896ce80b71 100644
--- a/drivers/net/ethernet/marvell/sky2.h
+++ b/drivers/net/ethernet/marvell/sky2.h
@@ -2241,7 +2241,6 @@ struct sky2_port {
u16 rx_pending;
u16 rx_data_size;
u16 rx_nfrags;
- u16 rx_tag;
struct {
unsigned long last;