netdev - Re: [PATCH net-next 10/18] openvswitch: Merge three per-CPU structures into one.

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Message-ID: <0c5a60bd-ceaa-42f1-8088-b1e38f36157b@redhat.com>
Date: Mon, 17 Mar 2025 18:34:38 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 netdev@...r.kernel.org, linux-rt-devel@...ts.linux.dev,
 Aaron Conole <aconole@...hat.com>, Eelco Chaudron <echaudro@...hat.com>,
 Ilya Maximets <i.maximets@....org>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Simon Horman <horms@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 Pravin B Shelar <pshelar@....org>, dev@...nvswitch.org
Subject: Re: [PATCH net-next 10/18] openvswitch: Merge three per-CPU
 structures into one.

On 3/9/25 3:46 PM, Sebastian Andrzej Siewior wrote:
> exec_actions_level is a per-CPU integer allocated at compile time.
> action_fifos and flow_keys are per-CPU pointer and have their data
> allocated at module init time.
> There is no gain in splitting it, once the module is allocated, the
> structures are allocated.
> 
> Merge the three per-CPU variables into ovs_action, adapt callers.
> 
> Cc: Pravin B Shelar <pshelar@....org>
> Cc: dev@...nvswitch.org
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  net/openvswitch/actions.c  | 49 +++++++++++++-------------------------
>  net/openvswitch/datapath.c |  9 +------
>  net/openvswitch/datapath.h |  3 ---
>  3 files changed, 17 insertions(+), 44 deletions(-)
> 
> diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
> index 704c858cf2093..322ca7b30c3bc 100644
> --- a/net/openvswitch/actions.c
> +++ b/net/openvswitch/actions.c
> @@ -78,17 +78,22 @@ struct action_flow_keys {
>  	struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD];
>  };
>  
> -static struct action_fifo __percpu *action_fifos;
> -static struct action_flow_keys __percpu *flow_keys;
> -static DEFINE_PER_CPU(int, exec_actions_level);
> +struct ovs_action {
> +	struct action_fifo action_fifos;
> +	struct action_flow_keys flow_keys;
> +	int exec_level;
> +};

I have the feeling this is not a very good name, as 'OVS action' has a
quite specific meaning, not really matched here.

Also more OVS people, as Pravin is not really active anymore.

Thanks,

Paolo