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Make use of the stats(3) framework in the TCP stack.

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This makes it possible to retrieve per-connection statistical
information such as the receive window size, RTT, or goodput,
using a newly added TCP_STATS getsockopt(3) option, and extract
them using the stats_voistat_fetch(3) API.

See the net/tcprtt port for an example consumer of this API.

Compared to the existing TCP_INFO system, the main differences
are that this mechanism is easy to extend without breaking ABI,
and provides statistical information instead of raw "snapshots"
of values at a given point in time.  stats(3) is more generic
and can be used in both userland and the kernel.

Reviewed by:	thj
Tested by:	thj
Obtained from:	Netflix
Relnotes:	yes
Sponsored by:	Klara Inc, Netflix
Differential Revision:	https://reviews.freebsd.org/D20655
This commit is contained in:
Edward Tomasz Napierala 2019-12-02 20:58:04 +00:00 committed by Sebastian Huber
parent 0c854dd6d1
commit 0c4d87ca5f
1 changed files with 15 additions and 0 deletions
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15
newlib/libc/sys/rtems/include/netinet/tcp.h
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@ -168,6 +168,7 @@ struct tcphdr {
#define TCP_NOOPT 8 /* don't use TCP options */
#define TCP_MD5SIG 16 /* use MD5 digests (RFC2385) */
#define TCP_INFO 32 /* retrieve tcp_info structure */
#define TCP_STATS 33 /* retrieve stats blob structure */
#define TCP_LOG 34 /* configure event logging for connection */
#define TCP_LOGBUF 35 /* retrieve event log for connection */
#define TCP_LOGID 36 /* configure log ID to correlate connections */
@ -364,4 +365,18 @@ struct tcp_function_set {
*/
#define TLS_SET_RECORD_TYPE 1
/*
* TCP specific variables of interest for tp->t_stats stats(9) accounting.
*/
#define VOI_TCP_TXPB 0 /* Transmit payload bytes */
#define VOI_TCP_RETXPB 1 /* Retransmit payload bytes */
#define VOI_TCP_FRWIN 2 /* Foreign receive window */
#define VOI_TCP_LCWIN 3 /* Local congesiton window */
#define VOI_TCP_RTT 4 /* Round trip time */
#define VOI_TCP_CSIG 5 /* Congestion signal */
#define VOI_TCP_GPUT 6 /* Goodput */
#define VOI_TCP_CALCFRWINDIFF 7 /* Congestion avoidance LCWIN - FRWIN */
#define VOI_TCP_GPUT_ND 8 /* Goodput normalised delta */
#define VOI_TCP_ACKLEN 9 /* Average ACKed bytes per ACK */
#endif /* !_NETINET_TCP_H_ */