netdev - Re: [PATCH] sctp: add support for RPS and RFS

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Date:	Tue, 12 Apr 2016 14:50:45 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Neil Horman <nhorman@...driver.com>,
	Vlad Yasevich <vyasevich@...il.com>, linux-sctp@...r.kernel.org
Subject: Re: [PATCH] sctp: add support for RPS and RFS

On Tue, Apr 12, 2016 at 2:11 PM, Marcelo Ricardo Leitner
<marcelo.leitner@...il.com> wrote:
> This patch adds what's missing to properly support RPS and RFS on SCTP,
> as some of it is already implemented in common calls.
>
> Having support for RPS and RFS allows better scaling specially because
> not all NICs support hashing SCTP headers.
>
> Save the hash right when we dequeue a skb from inqueue so we do it only
> once per skb instead of per chunk. New sockets will then inherit the
> hash through sctp_copy_sock().
>
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> ---
>  net/sctp/inqueue.c | 3 +++
>  net/sctp/socket.c  | 3 +++
>  2 files changed, 6 insertions(+)
>
> diff --git a/net/sctp/inqueue.c b/net/sctp/inqueue.c
> index 7e8a16c77039e1b70ef89f3e862dbb332bcc614f..b335ffcef0b901b0e71bf0843057dbf5877da31b 100644
> --- a/net/sctp/inqueue.c
> +++ b/net/sctp/inqueue.c
> @@ -163,6 +163,9 @@ struct sctp_chunk *sctp_inq_pop(struct sctp_inq *queue)
>                 chunk->singleton = 1;
>                 ch = (sctp_chunkhdr_t *) chunk->skb->data;
>                 chunk->data_accepted = 0;
> +
> +               if (chunk->asoc)
> +                       sock_rps_save_rxhash(chunk->asoc->base.sk, chunk->skb);
>         }
>
>         chunk->chunk_hdr = ch;
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index 878d28eda1a68dc639d7b9f3f663d7518f21bb32..36697f85ce48be39f41ddedd9f53369c7f9e28d8 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -6430,6 +6430,8 @@ unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
>
>         poll_wait(file, sk_sleep(sk), wait);
>
> +       sock_rps_record_flow(sk);
> +
>         /* A TCP-style listening socket becomes readable when the accept queue
>          * is not empty.
>          */
> @@ -7186,6 +7188,7 @@ void sctp_copy_sock(struct sock *newsk, struct sock *sk,
>         newsk->sk_lingertime = sk->sk_lingertime;
>         newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
>         newsk->sk_sndtimeo = sk->sk_sndtimeo;
> +       newsk->sk_rxhash = sk->sk_rxhash;
>
>         newinet = inet_sk(newsk);
>
HI Marcelo,

sock_rps_record_flow should probably be in sctp_poll also (like it is
in tcp_poll).

Thanks,
Tom

> --
> 2.5.0
>