[$] Upstreaming multipath TCP

The multipath TCP (MPTCP) protocol (and theLinux implementation of it) have beenunder development for a solid decade; MPTCP offers a number of advantages fordevices that have more than one network interface available. Despitehaving been deployed widely, though, MPTCP is still not supported by theupstream Linux kernel. At the 2019 Linux Plumbers Conference, MatthieuBaerts and Mat Martineau discussed the current state of the Linux MPTCPimplementation and what will be required to get it into the mainlinekernel.