Patchwork [v4,3/3] net: igmp: Allow user-space configuration of igmp unsolicited report interval

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Submitter William Manley
Date Aug. 6, 2013, 6:03 p.m.
Message ID <1375812195-6575-4-git-send-email-william.manley@youview.com>
Download mbox | patch
Permalink /patch/265193/
State Accepted
Delegated to: David Miller
Headers show

Comments

William Manley - Aug. 6, 2013, 6:03 p.m.
Adds the new procfs knobs:

    /proc/sys/net/ipv4/conf/*/igmpv2_unsolicited_report_interval
    /proc/sys/net/ipv4/conf/*/igmpv3_unsolicited_report_interval

Which will allow userspace configuration of the IGMP unsolicited report
interval (see below) in milliseconds.  The defaults are 10000ms for IGMPv2
and 1000ms for IGMPv3 in accordance with RFC2236 and RFC3376.

Background:

If an IGMP join packet is lost you will not receive data sent to the
multicast group so if no data arrives from that multicast group in a
period of time after the IGMP join a second IGMP join will be sent.  The
delay between joins is the "IGMP Unsolicited Report Interval".

Prior to this patch this value was hard coded in the kernel to 10s for
IGMPv2 and 1s for IGMPv3.  10s is unsuitable for some use-cases, such as
IPTV as it can cause channel change to be slow in the presence of packet
loss.

This patch allows the value to be overridden from userspace for both
IGMPv2 and IGMPv3 such that it can be tuned accoding to the network.

Tested with Wireshark and a simple program to join a (non-existent)
multicast group.  The distribution of timings for the second join differ
based upon setting the procfs knobs.

igmpvX_unsolicited_report_interval is intended to follow the pattern
established by force_igmp_version, and while a procfs entry has been added
a corresponding sysctl knob has not as it is my understanding that sysctl
is deprecated[1].

[1]: http://lwn.net/Articles/247243/

Signed-off-by: William Manley <william.manley@youview.com>
---
 include/linux/inetdevice.h |    2 ++
 net/ipv4/devinet.c         |    8 ++++++++
 net/ipv4/igmp.c            |   19 +++++++++++++++++--
 3 files changed, 27 insertions(+), 2 deletions(-)
Hannes Frederic Sowa - Aug. 7, 2013, 1 a.m.
On Tue, Aug 06, 2013 at 07:03:15PM +0100, William Manley wrote:
> Adds the new procfs knobs:
> 
>     /proc/sys/net/ipv4/conf/*/igmpv2_unsolicited_report_interval
>     /proc/sys/net/ipv4/conf/*/igmpv3_unsolicited_report_interval
> 
> Which will allow userspace configuration of the IGMP unsolicited report
> interval (see below) in milliseconds.  The defaults are 10000ms for IGMPv2
> and 1000ms for IGMPv3 in accordance with RFC2236 and RFC3376.
> 
> Background:
> 
> If an IGMP join packet is lost you will not receive data sent to the
> multicast group so if no data arrives from that multicast group in a
> period of time after the IGMP join a second IGMP join will be sent.  The
> delay between joins is the "IGMP Unsolicited Report Interval".
> 
> Prior to this patch this value was hard coded in the kernel to 10s for
> IGMPv2 and 1s for IGMPv3.  10s is unsuitable for some use-cases, such as
> IPTV as it can cause channel change to be slow in the presence of packet
> loss.
> 
> This patch allows the value to be overridden from userspace for both
> IGMPv2 and IGMPv3 such that it can be tuned accoding to the network.
> 
> Tested with Wireshark and a simple program to join a (non-existent)
> multicast group.  The distribution of timings for the second join differ
> based upon setting the procfs knobs.
> 
> igmpvX_unsolicited_report_interval is intended to follow the pattern
> established by force_igmp_version, and while a procfs entry has been added
> a corresponding sysctl knob has not as it is my understanding that sysctl
> is deprecated[1].
> 
> [1]: http://lwn.net/Articles/247243/
> 
> Signed-off-by: William Manley <william.manley@youview.com>

Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
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Benjamin LaHaise - Aug. 7, 2013, 1:43 p.m.
On Tue, Aug 06, 2013 at 07:03:15PM +0100, William Manley wrote:
> Adds the new procfs knobs:
> 
>     /proc/sys/net/ipv4/conf/*/igmpv2_unsolicited_report_interval
>     /proc/sys/net/ipv4/conf/*/igmpv3_unsolicited_report_interval
> 
> Which will allow userspace configuration of the IGMP unsolicited report
> interval (see below) in milliseconds.  The defaults are 10000ms for IGMPv2
> and 1000ms for IGMPv3 in accordance with RFC2236 and RFC3376.
> 
> Background:
> 
> If an IGMP join packet is lost you will not receive data sent to the
> multicast group so if no data arrives from that multicast group in a
> period of time after the IGMP join a second IGMP join will be sent.  The
> delay between joins is the "IGMP Unsolicited Report Interval".
> 
> Prior to this patch this value was hard coded in the kernel to 10s for
> IGMPv2 and 1s for IGMPv3.  10s is unsuitable for some use-cases, such as
> IPTV as it can cause channel change to be slow in the presence of packet
> loss.
> 
> This patch allows the value to be overridden from userspace for both
> IGMPv2 and IGMPv3 such that it can be tuned accoding to the network.
> 
> Tested with Wireshark and a simple program to join a (non-existent)
> multicast group.  The distribution of timings for the second join differ
> based upon setting the procfs knobs.
> 
> igmpvX_unsolicited_report_interval is intended to follow the pattern
> established by force_igmp_version, and while a procfs entry has been added
> a corresponding sysctl knob has not as it is my understanding that sysctl
> is deprecated[1].
> 
> [1]: http://lwn.net/Articles/247243/
> 
> Signed-off-by: William Manley <william.manley@youview.com>

Acked-by: Benjamin LaHaise <bcrl@kvack.org>

Also good.  Thanks!

		-ben

> ---
>  include/linux/inetdevice.h |    2 ++
>  net/ipv4/devinet.c         |    8 ++++++++
>  net/ipv4/igmp.c            |   19 +++++++++++++++++--
>  3 files changed, 27 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h
> index d4c56fc..43b3c72 100644
> --- a/include/linux/inetdevice.h
> +++ b/include/linux/inetdevice.h
> @@ -28,6 +28,8 @@ enum
>  	IPV4_DEVCONF_ARPFILTER,
>  	IPV4_DEVCONF_MEDIUM_ID,
>  	IPV4_DEVCONF_FORCE_IGMP_VERSION,
> +	IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL,
> +	IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL,
>  	IPV4_DEVCONF_NOXFRM,
>  	IPV4_DEVCONF_NOPOLICY,
>  	IPV4_DEVCONF_ARP_ANNOUNCE,
> diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
> index a9561c4..56ecb1b 100644
> --- a/net/ipv4/devinet.c
> +++ b/net/ipv4/devinet.c
> @@ -73,6 +73,8 @@ static struct ipv4_devconf ipv4_devconf = {
>  		[IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
>  		[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
>  		[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
> +		[IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
> +		[IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] =  1000 /*ms*/,
>  	},
>  };
>  
> @@ -83,6 +85,8 @@ static struct ipv4_devconf ipv4_devconf_dflt = {
>  		[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
>  		[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
>  		[IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
> +		[IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
> +		[IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] =  1000 /*ms*/,
>  	},
>  };
>  
> @@ -2096,6 +2100,10 @@ static struct devinet_sysctl_table {
>  		DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
>  		DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
>  					"force_igmp_version"),
> +		DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
> +					"igmpv2_unsolicited_report_interval"),
> +		DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
> +					"igmpv3_unsolicited_report_interval"),
>  
>  		DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
>  		DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
> diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
> index 9f0aaea..c5541da 100644
> --- a/net/ipv4/igmp.c
> +++ b/net/ipv4/igmp.c
> @@ -141,10 +141,25 @@
>  
>  static int unsolicited_report_interval(struct in_device *in_dev)
>  {
> +	int interval_ms, interval_jiffies;
> +
>  	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
> -		return IGMP_V2_Unsolicited_Report_Interval;
> +		interval_ms = IN_DEV_CONF_GET(
> +			in_dev,
> +			IGMPV2_UNSOLICITED_REPORT_INTERVAL);
>  	else /* v3 */
> -		return IGMP_V3_Unsolicited_Report_Interval;
> +		interval_ms = IN_DEV_CONF_GET(
> +			in_dev,
> +			IGMPV3_UNSOLICITED_REPORT_INTERVAL);
> +
> +	interval_jiffies = msecs_to_jiffies(interval_ms);
> +
> +	/* _timer functions can't handle a delay of 0 jiffies so ensure
> +	 *  we always return a positive value.
> +	 */
> +	if (interval_jiffies <= 0)
> +		interval_jiffies = 1;
> +	return interval_jiffies;
>  }
>  
>  static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
> -- 
> 1.7.10.4

Patch

diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h
index d4c56fc..43b3c72 100644
--- a/include/linux/inetdevice.h
+++ b/include/linux/inetdevice.h
@@ -28,6 +28,8 @@  enum
 	IPV4_DEVCONF_ARPFILTER,
 	IPV4_DEVCONF_MEDIUM_ID,
 	IPV4_DEVCONF_FORCE_IGMP_VERSION,
+	IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL,
+	IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL,
 	IPV4_DEVCONF_NOXFRM,
 	IPV4_DEVCONF_NOPOLICY,
 	IPV4_DEVCONF_ARP_ANNOUNCE,
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index a9561c4..56ecb1b 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -73,6 +73,8 @@  static struct ipv4_devconf ipv4_devconf = {
 		[IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
 		[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
 		[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
+		[IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
+		[IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] =  1000 /*ms*/,
 	},
 };
 
@@ -83,6 +85,8 @@  static struct ipv4_devconf ipv4_devconf_dflt = {
 		[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
 		[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
 		[IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
+		[IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
+		[IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] =  1000 /*ms*/,
 	},
 };
 
@@ -2096,6 +2100,10 @@  static struct devinet_sysctl_table {
 		DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
 		DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
 					"force_igmp_version"),
+		DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
+					"igmpv2_unsolicited_report_interval"),
+		DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
+					"igmpv3_unsolicited_report_interval"),
 
 		DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
 		DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 9f0aaea..c5541da 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -141,10 +141,25 @@ 
 
 static int unsolicited_report_interval(struct in_device *in_dev)
 {
+	int interval_ms, interval_jiffies;
+
 	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
-		return IGMP_V2_Unsolicited_Report_Interval;
+		interval_ms = IN_DEV_CONF_GET(
+			in_dev,
+			IGMPV2_UNSOLICITED_REPORT_INTERVAL);
 	else /* v3 */
-		return IGMP_V3_Unsolicited_Report_Interval;
+		interval_ms = IN_DEV_CONF_GET(
+			in_dev,
+			IGMPV3_UNSOLICITED_REPORT_INTERVAL);
+
+	interval_jiffies = msecs_to_jiffies(interval_ms);
+
+	/* _timer functions can't handle a delay of 0 jiffies so ensure
+	 *  we always return a positive value.
+	 */
+	if (interval_jiffies <= 0)
+		interval_jiffies = 1;
+	return interval_jiffies;
 }
 
 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);