linux-kernel - Re: [PATCH net-next 1/3] net: sched: cls_api: add skip

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Date: Thu, 15 Feb 2024 12:39:28 -0500
From: Jamal Hadi Salim <jhs@...atatu.com>
To: Asbjørn Sloth Tønnesen <ast@...erby.net>
Cc: Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>, 
	Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	llu@...erby.dk, Vlad Buslov <vladbu@...dia.com>, 
	Marcelo Ricardo Leitner <mleitner@...hat.com>
Subject: Re: [PATCH net-next 1/3] net: sched: cls_api: add skip_sw counter

+Cc Vlad and Marcelo..

On Thu, Feb 15, 2024 at 11:06 AM Asbjørn Sloth Tønnesen <ast@...erby.net> wrote:
>
> Maintain a count of skip_sw filters.
>
> This counter is protected by the cb_lock, and is updated
> at the same time as offloadcnt.
>
> Signed-off-by: Asbjørn Sloth Tønnesen <ast@...erby.net>
> ---
>  include/net/sch_generic.h | 1 +
>  net/sched/cls_api.c       | 4 ++++
>  2 files changed, 5 insertions(+)
>
> diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
> index 934fdb977551..46a63d1818a0 100644
> --- a/include/net/sch_generic.h
> +++ b/include/net/sch_generic.h
> @@ -476,6 +476,7 @@ struct tcf_block {
>         struct flow_block flow_block;
>         struct list_head owner_list;
>         bool keep_dst;
> +       atomic_t skipswcnt; /* Number of skip_sw filters */
>         atomic_t offloadcnt; /* Number of oddloaded filters */

For your use case is skipswcnt ever going to be any different than offloadcnt?

cheers,
jamal

>         unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
>         unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
> diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
> index ca5676b2668e..397c3d29659c 100644
> --- a/net/sched/cls_api.c
> +++ b/net/sched/cls_api.c
> @@ -3483,6 +3483,8 @@ static void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
>         if (*flags & TCA_CLS_FLAGS_IN_HW)
>                 return;
>         *flags |= TCA_CLS_FLAGS_IN_HW;
> +       if (tc_skip_sw(*flags))
> +               atomic_inc(&block->skipswcnt);
>         atomic_inc(&block->offloadcnt);
>  }
>
> @@ -3491,6 +3493,8 @@ static void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
>         if (!(*flags & TCA_CLS_FLAGS_IN_HW))
>                 return;
>         *flags &= ~TCA_CLS_FLAGS_IN_HW;
> +       if (tc_skip_sw(*flags))
> +               atomic_dec(&block->skipswcnt);
>         atomic_dec(&block->offloadcnt);
>  }
>
> --
> 2.43.0
>