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Date: Wed, 16 Dec 2015 09:18:00 -0200
From: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To: zyjzyj2000@...il.com
Cc: vyasevich@...il.com, nhorman@...driver.com,
linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
alexandre.dietsch@...driver.com, stefan.costandache@...driver.com
Subject: Re: [PATCH 1/1] net: sctp: dynamically enable or disable pf state
On Wed, Dec 16, 2015 at 01:55:04PM +0800, zyjzyj2000@...il.com wrote:
> From: Zhu Yanjun <zyjzyj2000@...il.com>
>
> As we all know, the value of pf_retrans >= max_retrans_path can
> disable pf state. The variables of pf_retrans and max_retrans_path
> can be changed by the userspace application.
>
> Sometimes the user expects to disable pf state while the 2
> variables are changed to enable pf state. So it is necessary to
> introduce a new variable to disable pf state.
>
> According to the suggestions from Vlad Yasevich, extra1 and extra2
> are removed. The initialization of pf_enable is added.
>
> Acked-by: Vlad Yasevich <vyasevich@...il.com>
> Signed-off-by: Zhu Yanjun <zyjzyj2000@...il.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> ---
> Documentation/networking/ip-sysctl.txt | 23 ++++++++++++++++++++++-
> include/net/netns/sctp.h | 7 +++++++
> net/sctp/protocol.c | 3 +++
> net/sctp/sm_sideeffect.c | 5 ++++-
> net/sctp/sysctl.c | 7 +++++++
> 5 files changed, 43 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
> index 2ea4c45..f43ead3 100644
> --- a/Documentation/networking/ip-sysctl.txt
> +++ b/Documentation/networking/ip-sysctl.txt
> @@ -1723,6 +1723,25 @@ addip_enable - BOOLEAN
>
> Default: 0
>
> +pf_enable - INTEGER
> + Enable or disable pf (pf is short for potentially failed) state. A value
> + of pf_retrans > path_max_retrans also disables pf state. That is, one of
> + both pf_enable and pf_retrans > path_max_retrans can disable pf state.
> + Since pf_retrans and path_max_retrans can be changed by userspace
> + application, sometimes user expects to disable pf state by the value of
> + pf_retrans > path_max_retrans, but occasionally the value of pf_retrans
> + or path_max_retrans is changed by the user application, this pf state is
> + enabled. As such, it is necessary to add this to dynamically enable
> + and disable pf state. See:
> + https://datatracker.ietf.org/doc/draft-ietf-tsvwg-sctp-failover for
> + details.
> +
> + 1: Enable pf.
> +
> + 0: Disable pf.
> +
> + Default: 1
> +
> addip_noauth_enable - BOOLEAN
> Dynamic Address Reconfiguration (ADD-IP) requires the use of
> authentication to protect the operations of adding or removing new
> @@ -1799,7 +1818,9 @@ pf_retrans - INTEGER
> having to reduce path_max_retrans to a very low value. See:
> http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
> for details. Note also that a value of pf_retrans > path_max_retrans
> - disables this feature
> + disables this feature. Since both pf_retrans and path_max_retrans can
> + be changed by userspace application, a variable pf_enable is used to
> + disable pf state.
>
> Default: 0
>
> diff --git a/include/net/netns/sctp.h b/include/net/netns/sctp.h
> index 8ba379f..c501d67 100644
> --- a/include/net/netns/sctp.h
> +++ b/include/net/netns/sctp.h
> @@ -89,6 +89,13 @@ struct netns_sctp {
> int pf_retrans;
>
> /*
> + * Disable Potentially-Failed feature, the feature is enabled by default
> + * pf_enable - 0 : disable pf
> + * - >0 : enable pf
> + */
> + int pf_enable;
> +
> + /*
> * Policy for preforming sctp/socket accounting
> * 0 - do socket level accounting, all assocs share sk_sndbuf
> * 1 - do sctp accounting, each asoc may use sk_sndbuf bytes
> diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
> index 3d9ea9a..cfbf49b 100644
> --- a/net/sctp/protocol.c
> +++ b/net/sctp/protocol.c
> @@ -1223,6 +1223,9 @@ static int __net_init sctp_defaults_init(struct net *net)
> /* Max.Burst - 4 */
> net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
>
> + /* Enable pf state by default */
> + net->sctp.pf_enable = 1;
> +
> /* Association.Max.Retrans - 10 attempts
> * Path.Max.Retrans - 5 attempts (per destination address)
> * Max.Init.Retransmits - 8 attempts
> diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
> index 6098d4c..05cd164 100644
> --- a/net/sctp/sm_sideeffect.c
> +++ b/net/sctp/sm_sideeffect.c
> @@ -477,6 +477,8 @@ static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands,
> struct sctp_transport *transport,
> int is_hb)
> {
> + struct net *net = sock_net(asoc->base.sk);
> +
> /* The check for association's overall error counter exceeding the
> * threshold is done in the state function.
> */
> @@ -503,7 +505,8 @@ static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands,
> * is SCTP_ACTIVE, then mark this transport as Partially Failed,
> * see SCTP Quick Failover Draft, section 5.1
> */
> - if ((transport->state == SCTP_ACTIVE) &&
> + if (net->sctp.pf_enable &&
> + (transport->state == SCTP_ACTIVE) &&
> (asoc->pf_retrans < transport->pathmaxrxt) &&
> (transport->error_count > asoc->pf_retrans)) {
>
> diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
> index 26d50c5..ccbfc93 100644
> --- a/net/sctp/sysctl.c
> +++ b/net/sctp/sysctl.c
> @@ -308,6 +308,13 @@ static struct ctl_table sctp_net_table[] = {
> .extra1 = &max_autoclose_min,
> .extra2 = &max_autoclose_max,
> },
> + {
> + .procname = "pf_enable",
> + .data = &init_net.sctp.pf_enable,
> + .maxlen = sizeof(int),
> + .mode = 0644,
> + .proc_handler = proc_dointvec,
> + },
>
> { /* sentinel */ }
> };
> --
> 1.7.9.5
>
> --
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