netdev - Re: [PATCH net-next v3 00/17] Multipath TCP part 3: Multiple subflows and path management

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Date:   Sun, 29 Mar 2020 22:15:11 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     mathew.j.martineau@...ux.intel.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next v3 00/17] Multipath TCP part 3: Multiple
 subflows and path management

From: Mat Martineau <mathew.j.martineau@...ux.intel.com>
Date: Fri, 27 Mar 2020 14:48:36 -0700

> v2 -> v3: Remove 'inline' in .c files, fix uapi bit macros, and rebase.
> 
> v1 -> v2: Rebase on current net-next, fix for netlink limit setting,
> and update .gitignore for selftest.
> 
> This patch set allows more than one TCP subflow to be established and
> used for a multipath TCP connection. Subflows are added to an existing
> connection using the MP_JOIN option during the 3-way handshake. With
> multiple TCP subflows available, sent data is now stored in the MPTCP
> socket so it may be retransmitted on any TCP subflow if there is no
> DATA_ACK before a timeout. If an MPTCP-level timeout occurs, data is
> retransmitted using an available subflow. Storing this sent data
> requires the addition of memory accounting at the MPTCP level, which was
> previously delegated to the single subflow. Incoming DATA_ACKs now free
> data from the MPTCP-level retransmit buffer.
> 
> IP addresses available for new subflow connections can now be advertised
> and received with the ADD_ADDR option, and the corresponding REMOVE_ADDR
> option likewise advertises that an address is no longer available.
> 
> The MPTCP path manager netlink interface has commands to set in-kernel
> limits for the number of concurrent subflows and control the
> advertisement of IP addresses between peers.
> 
> To track and debug MPTCP connections there are new MPTCP MIB counters,
> and subflow context can be requested using inet_diag. The MPTCP
> self-tests now validate multiple-subflow operation and the netlink path
> manager interface.

Series applied, thanks.