linux-kernel - Re: [PATCH] openvswitch: Add recirc

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Message-ID: <1D0EA638-3067-4F74-8E94-3D766D262B39@redhat.com>
Date:   Thu, 31 Mar 2022 10:28:13 +0200
From:   Eelco Chaudron <echaudro@...hat.com>
To:     Stéphane Graber <stgraber@...ntu.com>
Cc:     netdev@...r.kernel.org, Pravin B Shelar <pshelar@....org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, dev@...nvswitch.org,
        linux-kernel@...r.kernel.org,
        Frode Nordahl <frode.nordahl@...onical.com>
Subject: Re: [PATCH] openvswitch: Add recirc_id to recirc warning



On 30 Mar 2022, at 21:42, Stéphane Graber wrote:

> When hitting the recirculation limit, the kernel would currently log
> something like this:
>
> [   58.586597] openvswitch: ovs-system: deferred action limit reached, drop recirc action
>
> Which isn't all that useful to debug as we only have the interface name
> to go on but can't track it down to a specific flow.
>
> With this change, we now instead get:
>
> [   58.586597] openvswitch: ovs-system: deferred action limit reached, drop recirc action (recirc_id=0x9e)
>
> Which can now be correlated with the flow entries from OVS.
>
> Suggested-by: Frode Nordahl <frode.nordahl@...onical.com>
> Signed-off-by: Stéphane Graber <stgraber@...ntu.com>
> Tested-by: Stephane Graber <stgraber@...ntu.com>
> ---

This change looks good to me, and it makes debugging easier.

Acked-by: Eelco Chaudron <echaudro@...hat.com>

>  net/openvswitch/actions.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
> index 780d9e2246f3..7056cb1b8ba0 100644
> --- a/net/openvswitch/actions.c
> +++ b/net/openvswitch/actions.c
> @@ -1539,8 +1539,8 @@ static int clone_execute(struct datapath *dp, struct sk_buff *skb,
>  				pr_warn("%s: deferred action limit reached, drop sample action\n",
>  					ovs_dp_name(dp));
>  			} else {  /* Recirc action */
> -				pr_warn("%s: deferred action limit reached, drop recirc action\n",
> -					ovs_dp_name(dp));
> +				pr_warn("%s: deferred action limit reached, drop recirc action (recirc_id=%#x)\n",
> +					ovs_dp_name(dp), recirc_id);
>  			}
>  		}
>  	}
> -- 
> 2.34.1