The current locking schema used to protect the MPTCP data-path requires the usage of the MPTCP workqueue to process the incoming data, depending on trylock result.
The above poses scalability limits and introduces random delays in MPTCP-level acks. With this series we use a single spinlock to protect the MPTCP data-path, removing the need for workqueue and delayed ack usage. This additionally reduces the number of atomic operations required per packet and cleans-up considerably the poll/wake-up code. Paolo Abeni (6): mptcp: open code mptcp variant for lock_sock mptcp: implement wmem reservation mptcp: protect the rx path with the msk socket spinlock mptcp: allocate TX skbs in msk context mptcp: avoid a few atomic ops in the rx path mptcp: use mptcp release_cb for delayed tasks include/net/sock.h | 1 + net/core/sock.c | 2 +- net/mptcp/mptcp_diag.c | 2 +- net/mptcp/options.c | 47 +-- net/mptcp/protocol.c | 733 ++++++++++++++++++++++++++++++----------- net/mptcp/protocol.h | 34 +- net/mptcp/subflow.c | 14 +- 7 files changed, 598 insertions(+), 235 deletions(-) -- 2.26.2
