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

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Date:   Fri, 7 Sep 2018 11:11:13 +0200
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Vlad Buslov <vladbu@...lanox.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 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?

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;
>