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net: dsa: lan9303: handle hwaccel VLAN tags 

Check for a hwaccel VLAN tag on rx and use it if present.  Otherwise,
use __skb_vlan_pop() like the other tag parsers do.  This fixes the case
where the VLAN tag has already been consumed by the master.

Fixes: a1292595e0 ("net: dsa: add new DSA switch driver for the SMSC-LAN9303")
Signed-off-by: Mans Rullgard <mans@mansr.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://lore.kernel.org/r/20220216124634.23123-1-mans@mansr.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Mans Rullgard 2022-02-16 12:46:34 +00:00 committed by Jakub Kicinski
parent b9208492fc
commit 017b355bbd
1 changed files with 7 additions and 14 deletions
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21
net/dsa/tag_lan9303.c
View File

@ -77,7 +77,6 @@ static struct sk_buff *lan9303_xmit(struct sk_buff *skb, struct net_device *dev)
static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev)
{
__be16 *lan9303_tag;
u16 lan9303_tag1;
unsigned int source_port;
@ -87,14 +86,15 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev)
return NULL;
}
lan9303_tag = dsa_etype_header_pos_rx(skb);
if (lan9303_tag[0] != htons(ETH_P_8021Q)) {
dev_warn_ratelimited(&dev->dev, "Dropping packet due to invalid VLAN marker\n");
return NULL;
if (skb_vlan_tag_present(skb)) {
lan9303_tag1 = skb_vlan_tag_get(skb);
__vlan_hwaccel_clear_tag(skb);
} else {
skb_push_rcsum(skb, ETH_HLEN);
__skb_vlan_pop(skb, &lan9303_tag1);
skb_pull_rcsum(skb, ETH_HLEN);
}
lan9303_tag1 = ntohs(lan9303_tag[1]);
source_port = lan9303_tag1 & 0x3;
skb->dev = dsa_master_find_slave(dev, 0, source_port);
@ -103,13 +103,6 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev)
return NULL;
}
/* remove the special VLAN tag between the MAC addresses
* and the current ethertype field.
*/
skb_pull_rcsum(skb, 2 + 2);
dsa_strip_etype_header(skb, LAN9303_TAG_LEN);
if (!(lan9303_tag1 & LAN9303_TAG_RX_TRAPPED_TO_CPU))
dsa_default_offload_fwd_mark(skb);