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

[Bob McMahon]

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 at gmail.com> wrote:

> This should be "fun".
>
> ---------- Forwarded message ---------
> From: Taehee Yoo <ap420073 at 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 at davemloft.net>, <kuba at kernel.org>, <dsahern at kernel.org>,
> <netdev at vger.kernel.org>
> Cc: <dkirjanov at suse.de>, <ap420073 at gmail.com>
>
>
> This is an implementation of AMT(Automatic Multicast Tunneling), RFC 7450.
> https://datatracker.ietf.org/doc/html/rfc7450
>
> 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
>
> Dave Täht CEO, TekLibre, LLC
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> https://lists.bufferbloat.net/listinfo/make-wifi-fast

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