netdev - Re: [PATCH v3 net] sctp: count singleton chunks in assoc user stats

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Message-ID: <YkSzLJ72M5f5EL2L@t14s.localdomain>
Date:   Wed, 30 Mar 2022 16:44:44 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Jamie Bainbridge <jamie.bainbridge@...il.com>
Cc:     Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-sctp@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 net] sctp: count singleton chunks in assoc user stats

On Wed, Mar 30, 2022 at 01:06:02PM +1000, Jamie Bainbridge wrote:
> Singleton chunks (INIT, HEARTBEAT PMTU probes, and SHUTDOWN-
> COMPLETE) are not counted in SCTP_GET_ASOC_STATS "sas_octrlchunks"
> counter available to the assoc owner.
> 
> These are all control chunks so they should be counted as such.
> 
> Add counting of singleton chunks so they are properly accounted for.
> 
> Fixes: 196d67593439 ("sctp: Add support to per-association statistics via a new SCTP_GET_ASSOC_STATS call")
> Signed-off-by: Jamie Bainbridge <jamie.bainbridge@...il.com>
> ---
>  net/sctp/outqueue.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
> index a18609f608fb786b2532a4febbd72a9737ab906c..bed34918b41f24810677adc0cd4fbd0859396a02 100644
> --- a/net/sctp/outqueue.c
> +++ b/net/sctp/outqueue.c
> @@ -914,6 +914,7 @@ static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
>  				ctx->asoc->base.sk->sk_err = -error;
>  				return;
>  			}
> +			ctx->asoc->stats.octrlchunks++;
>  			break;
>  
>  		case SCTP_CID_ABORT:
> @@ -939,6 +940,7 @@ static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
>  		case SCTP_CID_HEARTBEAT:
>  			if (chunk->pmtu_probe) {
>  				sctp_packet_singleton(ctx->transport, chunk, ctx->gfp);
> +				ctx->asoc->stats.octrlchunks++;

sctp_packet_singleton can fail. It shouldn't be propagated to the
socket but octrlchunks shouldn't be incremented then. Not too diferent
from the one above.

>  				break;
>  			}
>  			fallthrough;
> -- 
> 2.35.1
>