| Message ID | 20230821-upstream-net-next-20230818-v1-0-0c860fb256a8@kernel.org (mailing list archive) |
|---|---|
| Headers | show |
| Series | mptcp: Prepare MPTCP packet scheduler for BPF extension | expand |
Hello: This series was applied to netdev/net-next.git (main) by Jakub Kicinski <kuba@kernel.org>: On Mon, 21 Aug 2023 15:25:11 -0700 you wrote: > The kernel's MPTCP packet scheduler has, to date, been a one-size-fits > all algorithm that is hard-coded. It attempts to balance latency and > throughput when transmitting data across multiple TCP subflows, and has > some limited tunability through sysctls. It has been a long-term goal of > the Linux MPTCP community to support customizable packet schedulers for > use cases that need to make different trade-offs regarding latency, > throughput, redundancy, and other metrics. BPF is well-suited for > configuring customized, per-packet scheduling decisions without having > to modify the kernel or manage out-of-tree kernel modules. > > [...] Here is the summary with links: - [net-next,01/10] mptcp: refactor push_pending logic https://git.kernel.org/netdev/net-next/c/c5b4297dee91 - [net-next,02/10] mptcp: drop last_snd and MPTCP_RESET_SCHEDULER https://git.kernel.org/netdev/net-next/c/ebc1e08f01eb - [net-next,03/10] mptcp: add struct mptcp_sched_ops https://git.kernel.org/netdev/net-next/c/740ebe35bd3f - [net-next,04/10] mptcp: add a new sysctl scheduler https://git.kernel.org/netdev/net-next/c/e3b2870b6d22 - [net-next,05/10] mptcp: add sched in mptcp_sock https://git.kernel.org/netdev/net-next/c/1730b2b2c5a5 - [net-next,06/10] mptcp: add scheduled in mptcp_subflow_context https://git.kernel.org/netdev/net-next/c/fce68b03086f - [net-next,07/10] mptcp: add scheduler wrappers https://git.kernel.org/netdev/net-next/c/07336a87fe87 - [net-next,08/10] mptcp: use get_send wrapper https://git.kernel.org/netdev/net-next/c/0fa1b3783a17 - [net-next,09/10] mptcp: use get_retrans wrapper https://git.kernel.org/netdev/net-next/c/ee2708aedad0 - [net-next,10/10] mptcp: register default scheduler https://git.kernel.org/netdev/net-next/c/ed1ad86b8527 You are awesome, thank you!
The kernel's MPTCP packet scheduler has, to date, been a one-size-fits all algorithm that is hard-coded. It attempts to balance latency and throughput when transmitting data across multiple TCP subflows, and has some limited tunability through sysctls. It has been a long-term goal of the Linux MPTCP community to support customizable packet schedulers for use cases that need to make different trade-offs regarding latency, throughput, redundancy, and other metrics. BPF is well-suited for configuring customized, per-packet scheduling decisions without having to modify the kernel or manage out-of-tree kernel modules. The first steps toward implementing BPF packet schedulers are to update the existing MPTCP transmit loops to allow more flexible scheduling decisions, and to add infrastructure for swappable packet schedulers. The existing scheduling algorithm remains the default. BPF-related changes will be in a future patch series. This code has been in the MPTCP development tree for quite a while, undergoing testing in our CI and community. Patches 1 and 2 refactor the transmit code and do some related cleanup. Patches 3-9 add infrastructure for registering and calling multiple schedulers. Patch 10 connects the in-kernel default scheduler to the new infrastructure. Signed-off-by: Mat Martineau <martineau@kernel.org> --- Geliang Tang (10): mptcp: refactor push_pending logic mptcp: drop last_snd and MPTCP_RESET_SCHEDULER mptcp: add struct mptcp_sched_ops mptcp: add a new sysctl scheduler mptcp: add sched in mptcp_sock mptcp: add scheduled in mptcp_subflow_context mptcp: add scheduler wrappers mptcp: use get_send wrapper mptcp: use get_retrans wrapper mptcp: register default scheduler Documentation/networking/mptcp-sysctl.rst | 8 + include/net/mptcp.h | 21 +++ net/mptcp/Makefile | 2 +- net/mptcp/ctrl.c | 14 ++ net/mptcp/pm.c | 9 +- net/mptcp/pm_netlink.c | 3 - net/mptcp/protocol.c | 277 +++++++++++++++++------------- net/mptcp/protocol.h | 18 +- net/mptcp/sched.c | 173 +++++++++++++++++++ 9 files changed, 393 insertions(+), 132 deletions(-) --- base-commit: 7eb6deb3f55678216a6a0e956846c04958093ea5 change-id: 20230818-upstream-net-next-20230818-2d1199315465 Best regards,