From: Edward Tomasz Napierala <tr...@freebsd.org> 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 --- newlib/libc/sys/rtems/include/netinet/tcp.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/newlib/libc/sys/rtems/include/netinet/tcp.h b/newlib/libc/sys/rtems/include/netinet/tcp.h index 125cacb28..4e06c9792 100644 --- a/newlib/libc/sys/rtems/include/netinet/tcp.h +++ b/newlib/libc/sys/rtems/include/netinet/tcp.h @@ -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_ */ -- 2.35.3 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
