* [PATCH] net: dsa: lan9303: handle hwaccel VLAN tags
@ 2022-02-15 14:59 Mans Rullgard
2022-02-15 20:36 ` Vladimir Oltean
0 siblings, 1 reply; 3+ messages in thread
From: Mans Rullgard @ 2022-02-15 14:59 UTC (permalink / raw)
To: Andrew Lunn, Vivien Didelot, Florian Fainelli, Vladimir Oltean,
David S. Miller, Jakub Kicinski, Juergen Borleis, netdev,
linux-kernel
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.
Signed-off-by: Mans Rullgard <mans@mansr.com>
---
net/dsa/tag_lan9303.c | 21 +++++++--------------
1 file changed, 7 insertions(+), 14 deletions(-)
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index cb548188f813..7fe180941ac4 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -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;
+ skb_push_rcsum(skb, ETH_HLEN);
+ if (skb_vlan_tag_present(skb)) {
+ lan9303_tag1 = skb_vlan_tag_get(skb);
+ __vlan_hwaccel_clear_tag(skb);
+ } else {
+ __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);
--
2.35.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] net: dsa: lan9303: handle hwaccel VLAN tags
2022-02-15 14:59 [PATCH] net: dsa: lan9303: handle hwaccel VLAN tags Mans Rullgard
@ 2022-02-15 20:36 ` Vladimir Oltean
2022-02-16 12:48 ` Måns Rullgård
0 siblings, 1 reply; 3+ messages in thread
From: Vladimir Oltean @ 2022-02-15 20:36 UTC (permalink / raw)
To: Mans Rullgard
Cc: Andrew Lunn, Vivien Didelot, Florian Fainelli, David S. Miller,
Jakub Kicinski, Juergen Borleis, netdev, linux-kernel
On Tue, Feb 15, 2022 at 02:59:13PM +0000, Mans Rullgard wrote:
> 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.
>
> Signed-off-by: Mans Rullgard <mans@mansr.com>
> ---
> net/dsa/tag_lan9303.c | 21 +++++++--------------
> 1 file changed, 7 insertions(+), 14 deletions(-)
>
> diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
> index cb548188f813..7fe180941ac4 100644
> --- a/net/dsa/tag_lan9303.c
> +++ b/net/dsa/tag_lan9303.c
> @@ -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;
> + skb_push_rcsum(skb, ETH_HLEN);
> + if (skb_vlan_tag_present(skb)) {
> + lan9303_tag1 = skb_vlan_tag_get(skb);
> + __vlan_hwaccel_clear_tag(skb);
> + } else {
> + __skb_vlan_pop(skb, &lan9303_tag1);
Sorry for the bad example, there is no reason to call skb_push_rcsum()
and skb_pull_rcsum() if we go through the skb_vlan_tag_present() code
path, just the "else" branch.
> }
> + 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);
>
> --
> 2.35.1
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] net: dsa: lan9303: handle hwaccel VLAN tags
2022-02-15 20:36 ` Vladimir Oltean
@ 2022-02-16 12:48 ` Måns Rullgård
0 siblings, 0 replies; 3+ messages in thread
From: Måns Rullgård @ 2022-02-16 12:48 UTC (permalink / raw)
To: Vladimir Oltean
Cc: Andrew Lunn, Vivien Didelot, Florian Fainelli, David S. Miller,
Jakub Kicinski, Juergen Borleis, netdev, linux-kernel
Vladimir Oltean <olteanv@gmail.com> writes:
> On Tue, Feb 15, 2022 at 02:59:13PM +0000, Mans Rullgard wrote:
>> 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.
>>
>> Signed-off-by: Mans Rullgard <mans@mansr.com>
>> ---
>> net/dsa/tag_lan9303.c | 21 +++++++--------------
>> 1 file changed, 7 insertions(+), 14 deletions(-)
>>
>> diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
>> index cb548188f813..7fe180941ac4 100644
>> --- a/net/dsa/tag_lan9303.c
>> +++ b/net/dsa/tag_lan9303.c
>> @@ -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;
>> + skb_push_rcsum(skb, ETH_HLEN);
>> + if (skb_vlan_tag_present(skb)) {
>> + lan9303_tag1 = skb_vlan_tag_get(skb);
>> + __vlan_hwaccel_clear_tag(skb);
>> + } else {
>> + __skb_vlan_pop(skb, &lan9303_tag1);
>
> Sorry for the bad example, there is no reason to call skb_push_rcsum()
> and skb_pull_rcsum() if we go through the skb_vlan_tag_present() code
> path, just the "else" branch.
I could have realised that myself, had I not simply blindly copied the
example. Anyway, new patch sent.
--
Måns Rullgård
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-02-16 12:48 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2022-02-15 14:59 [PATCH] net: dsa: lan9303: handle hwaccel VLAN tags Mans Rullgard
2022-02-15 20:36 ` Vladimir Oltean
2022-02-16 12:48 ` Måns Rullgård
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