netdev - Re: [PATCH net-next] net: sched: cls_flower: dump offload count value

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Date:   Fri, 07 Sep 2018 12:28:35 +0300
From:   Vlad Buslov <vladbu@...lanox.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, davem@...emloft.net
Subject: Re: [PATCH net-next] net: sched: cls_flower: dump offload count value


On Fri 07 Sep 2018 at 09:11, Jakub Kicinski <jakub.kicinski@...ronome.com> wrote:
> On Thu,  6 Sep 2018 18:37:23 +0300, Vlad Buslov wrote:
>> Change flower in_hw_count type to fixed-size u32 and dump it as
>> TCA_FLOWER_IN_HW_COUNT. This change is necessary to properly test shared
>> blocks and re-offload functionality.
>> 
>> Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
>> Acked-by: Jiri Pirko <jiri@...lanox.com>
>> ---
>>  include/net/sch_generic.h    | 2 +-
>>  include/uapi/linux/pkt_cls.h | 2 ++
>>  net/sched/cls_flower.c       | 5 ++++-
>>  3 files changed, 7 insertions(+), 2 deletions(-)
>> 
>> diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
>> index a6d00093f35e..d68ac55539a5 100644
>> --- a/include/net/sch_generic.h
>> +++ b/include/net/sch_generic.h
>> @@ -362,7 +362,7 @@ static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
>>  }
>>  
>>  static inline void
>> -tc_cls_offload_cnt_update(struct tcf_block *block, unsigned int *cnt,
>> +tc_cls_offload_cnt_update(struct tcf_block *block, u32 *cnt,
>>  			  u32 *flags, bool add)
>>  {
>>  	if (add) {
>> diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
>> index be382fb0592d..2824fb7ed1c9 100644
>> --- a/include/uapi/linux/pkt_cls.h
>> +++ b/include/uapi/linux/pkt_cls.h
>> @@ -483,6 +483,8 @@ enum {
>>  	TCA_FLOWER_KEY_ENC_OPTS,
>>  	TCA_FLOWER_KEY_ENC_OPTS_MASK,
>>  
>> +	TCA_FLOWER_IN_HW_COUNT,		/* be32 */
>
> Why be32?

This comment is wrong.
Thanks for catching this.

>
> I wish there was a good way to share this attribute between
> classifiers :( 
>
>>  	__TCA_FLOWER_MAX,
>>  };
>>  
>> diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
>> index 6fd9bdd93796..4b8dd37dd4f8 100644
>> --- a/net/sched/cls_flower.c
>> +++ b/net/sched/cls_flower.c
>> @@ -98,7 +98,7 @@ struct cls_fl_filter {
>>  	struct list_head list;
>>  	u32 handle;
>>  	u32 flags;
>> -	unsigned int in_hw_count;
>> +	u32 in_hw_count;
>>  	struct rcu_work rwork;
>>  	struct net_device *hw_dev;
>>  };
>> @@ -1880,6 +1880,9 @@ static int fl_dump(struct net *net, struct tcf_proto *tp, void *fh,
>>  	if (f->flags && nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags))
>>  		goto nla_put_failure;
>>  
>> +	if (nla_put_u32(skb, TCA_FLOWER_IN_HW_COUNT, f->in_hw_count))
>> +		goto nla_put_failure;
>> +
>>  	if (tcf_exts_dump(skb, &f->exts))
>>  		goto nla_put_failure;
>>