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Diffstat (limited to 'Documentation/networking/mptcp-sysctl.rst')
| -rw-r--r-- | Documentation/networking/mptcp-sysctl.rst | 60 |
1 files changed, 57 insertions, 3 deletions
diff --git a/Documentation/networking/mptcp-sysctl.rst b/Documentation/networking/mptcp-sysctl.rst index fd514bba8c43..1eb6af26b4a7 100644 --- a/Documentation/networking/mptcp-sysctl.rst +++ b/Documentation/networking/mptcp-sysctl.rst @@ -8,9 +8,13 @@ MPTCP Sysfs variables =============================== add_addr_timeout - INTEGER (seconds) - Set the timeout after which an ADD_ADDR control message will be - resent to an MPTCP peer that has not acknowledged a previous - ADD_ADDR message. + Set the maximum value of timeout after which an ADD_ADDR control message + will be resent to an MPTCP peer that has not acknowledged a previous + ADD_ADDR message. A dynamically estimated retransmission timeout based + on the estimated connection round-trip-time is used if this value is + lower than the maximum one. + + Do not retransmit if set to 0. The default value matches TCP_RTO_MAX. This is a per-namespace sysctl. @@ -30,10 +34,25 @@ allow_join_initial_addr_port - BOOLEAN Default: 1 +available_path_managers - STRING + Shows the available path managers choices that are registered. More + path managers may be available, but not loaded. + available_schedulers - STRING Shows the available schedulers choices that are registered. More packet schedulers may be available, but not loaded. +blackhole_timeout - INTEGER (seconds) + Initial time period in second to disable MPTCP on active MPTCP sockets + when a MPTCP firewall blackhole issue happens. This time period will + grow exponentially when more blackhole issues get detected right after + MPTCP is re-enabled and will reset to the initial value when the + blackhole issue goes away. + + 0 to disable the blackhole detection. This is a per-namespace sysctl. + + Default: 3600 + checksum_enabled - BOOLEAN Control whether DSS checksum can be enabled. @@ -61,6 +80,23 @@ enabled - BOOLEAN Default: 1 (enabled) +path_manager - STRING + Set the default path manager name to use for each new MPTCP + socket. In-kernel path management will control subflow + connections and address advertisements according to + per-namespace values configured over the MPTCP netlink + API. Userspace path management puts per-MPTCP-connection subflow + connection decisions and address advertisements under control of + a privileged userspace program, at the cost of more netlink + traffic to propagate all of the related events and commands. + + This is a per-namespace sysctl. + + * "kernel" - In-kernel path manager + * "userspace" - Userspace path manager + + Default: "kernel" + pm_type - INTEGER Set the default path manager type to use for each new MPTCP socket. In-kernel path management will control subflow @@ -73,6 +109,8 @@ pm_type - INTEGER This is a per-namespace sysctl. + Deprecated since v6.15, use path_manager instead. + * 0 - In-kernel path manager * 1 - Userspace path manager @@ -97,3 +135,19 @@ stale_loss_cnt - INTEGER This is a per-namespace sysctl. Default: 4 + +syn_retrans_before_tcp_fallback - INTEGER + The number of SYN + MP_CAPABLE retransmissions before falling back to + TCP, i.e. dropping the MPTCP options. In other words, if all the packets + are dropped on the way, there will be: + + * The initial SYN with MPTCP support + * This number of SYN retransmitted with MPTCP support + * The next SYN retransmissions will be without MPTCP support + + 0 means the first retransmission will be done without MPTCP options. + >= 128 means that all SYN retransmissions will keep the MPTCP options. A + lower number might increase false-positive MPTCP blackholes detections. + This is a per-namespace sysctl. + + Default: 2 |