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sky2: fix receive length error in mixed non-VLAN/VLAN traffic

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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>
This commit is contained in:
stephen hemminger 2012-04-30 06:47:37 +00:00 committed by David S. Miller
parent 3f42941b5d
commit e072b3fad5
2 changed files with 17 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
drivers/net/ethernet/marvell/sky2.c
View file

@ -2495,9 +2495,11 @@ 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);
@ -2583,9 +2585,6 @@ 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);
@ -2593,6 +2592,9 @@ 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.
@ -2650,11 +2652,8 @@ 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
@ -2708,6 +2707,14 @@ 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;
@ -2766,8 +2773,7 @@ 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)
@ -2775,11 +2781,11 @@ 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))

1
drivers/net/ethernet/marvell/sky2.h
View file

@ -2241,7 +2241,6 @@ struct sky2_port {
u16 rx_pending;
u16 rx_data_size;
u16 rx_nfrags;
u16 rx_tag;
struct {
unsigned long last;