netdev - Re: [PATCH net-next 1/3] net/sched: add vlan push_eth and pop

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Date:   Tue, 15 Mar 2022 11:53:20 +0200
From:   Roi Dayan <roid@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Maor Dickman <maord@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...dia.com>
Subject: Re: [PATCH net-next 1/3] net/sched: add vlan push_eth and pop_eth
 action to the hardware IR



On 2022-03-15 7:02 AM, Jakub Kicinski wrote:
> Sorry for the late review.
> 
> On Wed, 9 Mar 2022 15:02:54 +0200 Roi Dayan wrote:
>> @@ -211,6 +213,8 @@ struct flow_action_entry {
>>   			__be16		proto;
>>   			u8		prio;
>>   		} vlan;
>> +		unsigned char vlan_push_eth_dst[ETH_ALEN];
>> +		unsigned char vlan_push_eth_src[ETH_ALEN];
> 
> Let's wrap these two in a struct, like all other members here,
> and add the customary comment indicating which action its for.
> 

ok.

>>   		struct {				/* FLOW_ACTION_MANGLE */
>>   							/* FLOW_ACTION_ADD */
>>   			enum flow_action_mangle_base htype;
>> diff --git a/include/net/tc_act/tc_vlan.h b/include/net/tc_act/tc_vlan.h
>> index f94b8bc26f9e..8a3422c70f9f 100644
>> --- a/include/net/tc_act/tc_vlan.h
>> +++ b/include/net/tc_act/tc_vlan.h
>> @@ -78,4 +78,18 @@ static inline u8 tcf_vlan_push_prio(const struct tc_action *a)
>>   
>>   	return tcfv_push_prio;
>>   }
>> +
>> +static inline void tcf_vlan_push_dst(unsigned char *dest, const struct tc_action *a)
>> +{
>> +	rcu_read_lock();
>> +	memcpy(dest, rcu_dereference(to_vlan(a)->vlan_p)->tcfv_push_dst, ETH_ALEN);
>> +	rcu_read_unlock();
>> +}
>> +
>> +static inline void tcf_vlan_push_src(unsigned char *dest, const struct tc_action *a)
>> +{
>> +	rcu_read_lock();
>> +	memcpy(dest, rcu_dereference(to_vlan(a)->vlan_p)->tcfv_push_src, ETH_ALEN);
>> +	rcu_read_unlock();
>> +}
> 
> The use of these two helpers separately makes no sense, we can't push
> half a header. It should be one helper populating both src and dst, IMO.

ok.