Re: [PATCH mptcp-next v12 0/3] BPF round-robin scheduler

[Mat Martineau <mathew.j.martineau@linux.intel.com>]

On Thu, 5 May 2022, Geliang Tang wrote:

> v12:
> - init ssk from data->contexts[0], instead of msk->first.
> - cycle through all the subflows, instead of the first two.
>

v12 looks ok for the export branch, but Andrii asked for us to use 
bpf_tcp_helpers.h instead of adding a new header file. Geliang, I think it 
would be easier to do a v13 with the header changes rather than apply v12 
and squash header changes.

- Mat

> v11:
> - rename array to contexts.
> - drop number of subflows in mptcp_sched_data.
> - set unused array elements to NULL.
> - add MPTCP_SUBFLOWS_MAX check in mptcp_sched_data_init.
>
> v10:
> - init subflows array in mptcp_sched_data_init.
> - for (int i = 0; i < data->subflows; i++) is not allowed in BPF, using
>   this instead:
> 	for (int i = 0; i < MPTCP_SUBFLOWS_MAX && i < data->subflows; i++)
> - deponds on: "BPF packet scheduler" series v18.
>
> v9:
> - add subflows array in mptcp_sched_data
> - deponds on: "BPF packet scheduler" series v17 +
>               Squash to "mptcp: add struct mptcp_sched_ops v17".
>
> v8:
> - use struct mptcp_sched_data.
> - deponds on: "BPF packet scheduler" series v14.
>
> v7:
> - rename retrans to reinject.
> - drop last_snd setting.
> - deponds on: "BPF packet scheduler" series v13.
>
> v6:
> - set call_me_again flag.
> - deponds on: "BPF packet scheduler" series v12.
>
> v5:
> - update patch 2, use temporary storage instead.
> - update patch 3, use new helpers.
> - deponds on: "BPF packet scheduler" series v11.
>
> v4:
> - add retrans argment for get_subflow()
>
> v3:
> - add last_snd write access.
> - keep msk->last_snd setting in get_subflow().
> - deponds on: "BPF packet scheduler" series v10.
>
> v2:
> - merge the squash-to patch.
> - implement bpf_mptcp_get_subflows helper, instead of
>   bpf_mptcp_get_next_subflow.
> - deponds on: "BPF packet scheduler v9".
>
> This patchset implements round-robin scheduler using BPF. Address to
> some commends for the RFC version:
>
> https://patchwork.kernel.org/project/mptcp/cover/cover.1631011068.git.geliangtang@xiaomi.com/
>
> Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/75
>
> Geliang Tang (3):
>  mptcp: add subflows array in sched data
>  selftests: bpf: add bpf_rr scheduler
>  selftests: bpf: add bpf_rr test
>
> include/net/mptcp.h                           |  2 +
> net/mptcp/sched.c                             | 14 ++++++
> .../testing/selftests/bpf/bpf_mptcp_helpers.h |  8 ++++
> .../testing/selftests/bpf/prog_tests/mptcp.c  | 38 +++++++++++++++
> .../selftests/bpf/progs/mptcp_bpf_rr.c        | 47 +++++++++++++++++++
> 5 files changed, 109 insertions(+)
> create mode 100644 tools/testing/selftests/bpf/progs/mptcp_bpf_rr.c
>
> -- 
> 2.34.1
>
>
>

--
Mat Martineau
Intel