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[PATCH net-next 2/8] net: dsa: directly fetch switch in lan9303_rcv

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  [PATCH net-next 2/8] net: dsa: directly fetch switch in lan9303_rcv Vivien Didelot <vivien.didelot@savoirfairelinux.com> - 2017-09-29 20:50 +0200
    Re: [PATCH net-next 2/8] net: dsa: directly fetch switch in  lan9303_rcv Florian Fainelli <f.fainelli@gmail.com> - 2017-09-29 21:10 +0200
      Re: [PATCH net-next 2/8] net: dsa: directly fetch switch in lan9303_rcv Vivien Didelot <vivien.didelot@savoirfairelinux.com> - 2017-09-29 21:10 +0200

#1742275 — [PATCH net-next 2/8] net: dsa: directly fetch switch in lan9303_rcv

In a single-chip switch fabric, there is no need to fetch the dsa_switch
structure from the tree, directly use the CPU port's "ds" member.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
---
 net/dsa/tag_lan9303.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index 0b9826105e42..f0b51acf36ac 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -72,11 +72,10 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
 {
 	u16 *lan9303_tag;
 	struct dsa_switch_tree *dst = dev->dsa_ptr;
-	struct dsa_switch *ds;
+	struct dsa_port *cpu_dp = dst->cpu_dp;
+	struct dsa_switch *ds = cpu_dp->ds;
 	unsigned int source_port;
 
-	ds = dst->ds[0];
-
 	if (unlikely(!ds)) {
 		dev_warn_ratelimited(&dev->dev, "Dropping packet, due to missing DSA switch device\n");
 		return NULL;
-- 
2.14.1

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#1742291 — Re: [PATCH net-next 2/8] net: dsa: directly fetch switch in lan9303_rcv

On 09/29/2017 11:36 AM, Vivien Didelot wrote:
> In a single-chip switch fabric, there is no need to fetch the dsa_switch
> structure from the tree, directly use the CPU port's "ds" member.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
> ---
>  net/dsa/tag_lan9303.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
> index 0b9826105e42..f0b51acf36ac 100644
> --- a/net/dsa/tag_lan9303.c
> +++ b/net/dsa/tag_lan9303.c
> @@ -72,11 +72,10 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
>  {
>  	u16 *lan9303_tag;
>  	struct dsa_switch_tree *dst = dev->dsa_ptr;
> -	struct dsa_switch *ds;
> +	struct dsa_port *cpu_dp = dst->cpu_dp;
> +	struct dsa_switch *ds = cpu_dp->ds;
>  	unsigned int source_port;
>  
> -	ds = dst->ds[0];
> -
>  	if (unlikely(!ds)) {
>  		dev_warn_ratelimited(&dev->dev, "Dropping packet, due to missing DSA switch device\n");
>  		return NULL;

Similarly to the patch before, you can probably drop this test, I don't
actually see how we could trigger it.
-- 
Florian

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#1742293

Hi Florian,

Florian Fainelli <f.fainelli@gmail.com> writes:

>> @@ -72,11 +72,10 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
>>  {
>>  	u16 *lan9303_tag;
>>  	struct dsa_switch_tree *dst = dev->dsa_ptr;
>> -	struct dsa_switch *ds;
>> +	struct dsa_port *cpu_dp = dst->cpu_dp;
>> +	struct dsa_switch *ds = cpu_dp->ds;
>>  	unsigned int source_port;
>>  
>> -	ds = dst->ds[0];
>> -
>>  	if (unlikely(!ds)) {
>>  		dev_warn_ratelimited(&dev->dev, "Dropping packet, due to missing DSA switch device\n");
>>  		return NULL;
>
> Similarly to the patch before, you can probably drop this test, I don't
> actually see how we could trigger it.

Good catch, I'll respin after eventually more reviews.


Thanks,

        Vivien

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