Re: [Make-wifi-fast] Fwd: [PATCH net-next v5 0/5] amt: add initial driver for Automatic Multicast Tunneling (AMT)

[Bob McMahon <bob.mcmahon@broadcom.com>]

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iperf 3 is about research networks carrying large data sets, e.g. particle
collider data acquisition captures., less about latency & multicast. And I
don't think anybody has plans to multicast CERN data over a WiFi network.

It's unfortunate that the naming has been confusing, e.g. the number 3
implies the next version of iperf. In reality, it's a separate design and
coding team and we intentionally don't share code, giving some independence
between the tools which helps to verify that the tools aren't driving the
measurement but the network is.

Bob

On Sun, Oct 31, 2021 at 12:34 PM Holland, Jake <jholland@akamai.com> wrote:

> Yes, iperf2 and VLC are my main go-tos outside of my own stuff.
>
>
>
> This was one of the big things that made me sad about iperf3.  Thanks Bob
> for getting it in there, it was really helpful for me :)
>
>
>
> -Jake
>
>
>
> *From: *Bob McMahon via Make-wifi-fast <
> make-wifi-fast@lists.bufferbloat.net>
> *Reply-To: *Bob McMahon <bob.mcmahon@broadcom.com>
> *Date: *Sat,2021-10-30 at 10:17 AM
> *To: *Dave Taht <dave.taht@gmail.com>
> *Cc: *Cake List <cake@lists.bufferbloat.net>, Make-Wifi-fast <
> make-wifi-fast@lists.bufferbloat.net>, ECN-Sane <
> ecn-sane@lists.bufferbloat.net>
> *Subject: *Re: [Make-wifi-fast] Fwd: [PATCH net-next v5 0/5] amt: add
> initial driver for Automatic Multicast Tunneling (AMT)
>
>
>
> As an FYI, iperf 2 supports both source specific and standard multicast
> joins. I think this one of the few open source traffic tools that supports
> multicast testing.
>
>
> Bob
>
>
>
> On Sat, Oct 30, 2021 at 7:24 AM Dave Taht <dave.taht@gmail.com> wrote:
>
> This should be "fun".
>
> ---------- Forwarded message ---------
> From: Taehee Yoo <ap420073@gmail.com>
> Date: Sat, Oct 30, 2021 at 5:42 AM
> Subject: [PATCH net-next v5 0/5] amt: add initial driver for Automatic
> Multicast Tunneling (AMT)
> To: <davem@davemloft.net>, <kuba@kernel.org>, <dsahern@kernel.org>,
> <netdev@vger.kernel.org>
> Cc: <dkirjanov@suse.de>, <ap420073@gmail.com>
>
>
> This is an implementation of AMT(Automatic Multicast Tunneling), RFC 7450.
> https://datatracker.ietf.org/doc/html/rfc7450
> <https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/rfc7450__;!!GjvTz_vk!A3ij1BC95UcJhHaWLSgiIdef_RePfYenud3dJANXLSHbiJJgd44psjItrAOc6Og$>
>
> This implementation supports IGMPv2, IGMPv3, MLDv1, MLDv2, and IPv4
> underlay.
>
>  Summary of RFC 7450
> The purpose of this protocol is to provide multicast tunneling.
> The main use-case of this protocol is to provide delivery multicast
> traffic from a multicast-enabled network to sites that lack multicast
> connectivity to the source network.
> There are two roles in AMT protocol, Gateway, and Relay.
> The main purpose of Gateway mode is to forward multicast listening
> information(IGMP, MLD) to the source.
> The main purpose of Relay mode is to forward multicast data to listeners.
> These multicast traffics(IGMP, MLD, multicast data packets) are tunneled.
>
> Listeners are located behind Gateway endpoint.
> But gateway itself can be a listener too.
> Senders are located behind Relay endpoint.
>
>     ___________       _________       _______       ________
>    |           |     |         |     |       |     |        |
>    | Listeners <-----> Gateway <-----> Relay <-----> Source |
>    |___________|     |_________|     |_______|     |________|
>       IGMP/MLD---------(encap)----------->
>          <-------------(decap)--------(encap)------Multicast Data
>
>  Usage of AMT interface
> 1. Create gateway interface
> ip link add amtg type amt mode gateway local 10.0.0.1 discovery 10.0.0.2 \
> dev gw1_rt gateway_port 2268 relay_port 2268
>
> 2. Create Relay interface
> ip link add amtr type amt mode relay local 10.0.0.2 dev relay_rt \
> relay_port 2268 max_tunnels 4
>
> v1 -> v2:
>  - Eliminate sparse warnings.
>    - Use bool type instead of __be16 for identifying v4/v6 protocol.
>
> v2 -> v3:
>  - Fix compile warning due to unsed variable.
>  - Add missing spinlock comment.
>  - Update help message of amt in Kconfig.
>
> v3 -> v4:
>  - Split patch.
>  - Use CHECKSUM_NONE instead of CHECKSUM_UNNECESSARY.
>  - Fix compile error.
>
> v4 -> v5:
>  - Remove unnecessary rcu_read_lock().
>  - Remove unnecessary amt_change_mtu().
>  - Change netlink error message.
>  - Add validation for IFLA_AMT_LOCAL_IP and IFLA_AMT_DISCOVERY_IP.
>  - Add comments in amt.h.
>  - Add missing dev_put() in error path of amt_newlink().
>  - Fix typo.
>  - Add BUILD_BUG_ON() in amt_smb_cb().
>  - Use macro instead of magic values.
>  - Use kzalloc() instead of kmalloc().
>  - Add selftest script.
>
> Taehee Yoo (5):
>   amt: add control plane of amt interface
>   amt: add data plane of amt interface
>   amt: add multicast(IGMP) report message handler
>   amt: add mld report message handler
>   selftests: add amt interface selftest script
>
>  MAINTAINERS                          |    8 +
>  drivers/net/Kconfig                  |   16 +
>  drivers/net/Makefile                 |    1 +
>  drivers/net/amt.c                    | 3290 ++++++++++++++++++++++++++
>  include/net/amt.h                    |  386 +++
>  include/uapi/linux/amt.h             |   62 +
>  tools/testing/selftests/net/Makefile |    1 +
>  tools/testing/selftests/net/amt.sh   |  284 +++
>  tools/testing/selftests/net/config   |    1 +
>  9 files changed, 4049 insertions(+)
>  create mode 100644 drivers/net/amt.c
>  create mode 100644 include/net/amt.h
>  create mode 100644 include/uapi/linux/amt.h
>  create mode 100644 tools/testing/selftests/net/amt.sh
>
> --
> 2.17.1
>
>
>
> --
> Fixing Starlink's Latencies: https://www.youtube.com/watch?v=c9gLo6Xrwgw
> <https://urldefense.com/v3/__https:/www.youtube.com/watch?v=c9gLo6Xrwgw__;!!GjvTz_vk!A3ij1BC95UcJhHaWLSgiIdef_RePfYenud3dJANXLSHbiJJgd44psjItJ65P8PM$>
>
> Dave Täht CEO, TekLibre, LLC
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