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tcp: add documentation for tcp_ca_state

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Add documentation to the tcp_ca_state enum, since this enum is
exposed in uapi.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Cc: Sowmini Varadhan <sowmini05@gmail.com>
Acked-by: Sowmini Varadhan <sowmini05@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Soheil Hassas Yeganeh 2019-03-22 10:59:47 -04:00 committed by David S. Miller
parent e6d1407013
commit 576fd2f7ca
1 changed files with 27 additions and 0 deletions
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27
include/uapi/linux/tcp.h
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@ -160,15 +160,42 @@ enum {
#define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */
#define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */
/*
* Sender's congestion state indicating normal or abnormal situations
* in the last round of packets sent. The state is driven by the ACK
* information and timer events.
*/
enum tcp_ca_state {
/*
* Nothing bad has been observed recently.
* No apparent reordering, packet loss, or ECN marks.
*/
TCP_CA_Open = 0,
#define TCPF_CA_Open (1<<TCP_CA_Open)
/*
* The sender enters disordered state when it has received DUPACKs or
* SACKs in the last round of packets sent. This could be due to packet
* loss or reordering but needs further information to confirm packets
* have been lost.
*/
TCP_CA_Disorder = 1,
#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
/*
* The sender enters Congestion Window Reduction (CWR) state when it
* has received ACKs with ECN-ECE marks, or has experienced congestion
* or packet discard on the sender host (e.g. qdisc).
*/
TCP_CA_CWR = 2,
#define TCPF_CA_CWR (1<<TCP_CA_CWR)
/*
* The sender is in fast recovery and retransmitting lost packets,
* typically triggered by ACK events.
*/
TCP_CA_Recovery = 3,
#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
/*
* The sender is in loss recovery triggered by retransmission timeout.
*/
TCP_CA_Loss = 4
#define TCPF_CA_Loss (1<<TCP_CA_Loss)
};