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* [newlib-cygwin] Make use of the stats(3) framework in the TCP stack.
@ 2022-07-11 11:51 Sebastian Huber
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From: Sebastian Huber @ 2022-07-11 11:51 UTC (permalink / raw)
To: newlib-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=0c4d87ca5f9aaf2b3af4f435bc7d342dc7a6705f
commit 0c4d87ca5f9aaf2b3af4f435bc7d342dc7a6705f
Author: Edward Tomasz Napierala <trasz@FreeBSD.org>
Date: Mon Dec 2 20:58:04 2019 +0000
Make use of the stats(3) framework in the TCP stack.
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
Diff:
---
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_ */
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