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ff5a0b421c
The msk can use backup subflows to transmit in-sequence data only if there are no other active subflow. On active backup scenario, the MPTCP connection can do forward progress only due to MPTCP retransmissions - rtx can pick backup subflows. This patch introduces a new flag flow MPTCP subflows: if the underlying TCP connection made no progresses for long time, and there are other less problematic subflows available, the given subflow become stale. Stale subflows are not considered active: if all non backup subflows become stale, the MPTCP scheduler can pick backup subflows for plain transmissions. Stale subflows can return in active state, as soon as any reply from the peer is observed. Active backup scenarios can now leverage the available b/w with no restrinction. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/207 Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
59 lines
1.6 KiB
ReStructuredText
59 lines
1.6 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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=====================
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MPTCP Sysfs variables
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=====================
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/proc/sys/net/mptcp/* Variables
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===============================
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enabled - BOOLEAN
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Control whether MPTCP sockets can be created.
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MPTCP sockets can be created if the value is 1. This is a
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per-namespace sysctl.
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Default: 1 (enabled)
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add_addr_timeout - INTEGER (seconds)
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Set the timeout after which an ADD_ADDR control message will be
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resent to an MPTCP peer that has not acknowledged a previous
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ADD_ADDR message.
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The default value matches TCP_RTO_MAX. This is a per-namespace
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sysctl.
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Default: 120
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checksum_enabled - BOOLEAN
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Control whether DSS checksum can be enabled.
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DSS checksum can be enabled if the value is nonzero. This is a
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per-namespace sysctl.
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Default: 0
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allow_join_initial_addr_port - BOOLEAN
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Allow peers to send join requests to the IP address and port number used
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by the initial subflow if the value is 1. This controls a flag that is
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sent to the peer at connection time, and whether such join requests are
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accepted or denied.
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Joins to addresses advertised with ADD_ADDR are not affected by this
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value.
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This is a per-namespace sysctl.
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Default: 1
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stale_loss_cnt - INTEGER
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The number of MPTCP-level retransmission intervals with no traffic and
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pending outstanding data on a given subflow required to declare it stale.
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The packet scheduler ignores stale subflows.
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A low stale_loss_cnt value allows for fast active-backup switch-over,
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an high value maximize links utilization on edge scenarios e.g. lossy
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link with high BER or peer pausing the data processing.
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This is a per-namespace sysctl.
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Default: 4
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