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Use counter(9) for PLPMTUD counters.

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Remove unused PLPMTUD sysctl counters.

Bump UPDATING and FreeBSD Version to indicate a rebuild is required.

Submitted by:	kevin.bowling@kev009.com
Reviewed by:	jtl
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D12003
This commit is contained in:
Sean Bruno 2017-08-25 19:41:38 +00:00
parent d86cddf0f0
commit 32a04bb81d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=322900
5 changed files with 29 additions and 30 deletions
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5
UPDATING
View File

@ -51,6 +51,11 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 12.x IS SLOW:
****************************** SPECIAL WARNING: ******************************
20170825:
Move PMTUD blackhole counters to TCPSTATS and remove them from bare
sysctl values. Minor nit, but requires a rebuild of both world/kernel
to complete.
20170814:
"make check" behavior (made in ^/head@r295380) has been changed to
execute from a limited sandbox, as opposed to executing from

33
sys/netinet/tcp_timer.c
View File

@ -148,29 +148,6 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, pmtud_blackhole_detection,
&VNET_NAME(tcp_pmtud_blackhole_detect), 0,
"Path MTU Discovery Black Hole Detection Enabled");
static VNET_DEFINE(int, tcp_pmtud_blackhole_activated);
#define V_tcp_pmtud_blackhole_activated \
VNET(tcp_pmtud_blackhole_activated)
SYSCTL_INT(_net_inet_tcp, OID_AUTO, pmtud_blackhole_activated,
CTLFLAG_RD|CTLFLAG_VNET,
&VNET_NAME(tcp_pmtud_blackhole_activated), 0,
"Path MTU Discovery Black Hole Detection, Activation Count");
static VNET_DEFINE(int, tcp_pmtud_blackhole_activated_min_mss);
#define V_tcp_pmtud_blackhole_activated_min_mss \
VNET(tcp_pmtud_blackhole_activated_min_mss)
SYSCTL_INT(_net_inet_tcp, OID_AUTO, pmtud_blackhole_activated_min_mss,
CTLFLAG_RD|CTLFLAG_VNET,
&VNET_NAME(tcp_pmtud_blackhole_activated_min_mss), 0,
"Path MTU Discovery Black Hole Detection, Activation Count at min MSS");
static VNET_DEFINE(int, tcp_pmtud_blackhole_failed);
#define V_tcp_pmtud_blackhole_failed VNET(tcp_pmtud_blackhole_failed)
SYSCTL_INT(_net_inet_tcp, OID_AUTO, pmtud_blackhole_failed,
CTLFLAG_RD|CTLFLAG_VNET,
&VNET_NAME(tcp_pmtud_blackhole_failed), 0,
"Path MTU Discovery Black Hole Detection, Failure Count");
#ifdef INET
static VNET_DEFINE(int, tcp_pmtud_blackhole_mss) = 1200;
#define V_tcp_pmtud_blackhole_mss VNET(tcp_pmtud_blackhole_mss)
@ -772,7 +749,7 @@ tcp_timer_rexmt(void * xtp)
tp->t_maxseg > V_tcp_v6pmtud_blackhole_mss) {
/* Use the sysctl tuneable blackhole MSS. */
tp->t_maxseg = V_tcp_v6pmtud_blackhole_mss;
V_tcp_pmtud_blackhole_activated++;
TCPSTAT_INC(tcps_pmtud_blackhole_activated);
} else if (isipv6) {
/* Use the default MSS. */
tp->t_maxseg = V_tcp_v6mssdflt;
@ -781,7 +758,7 @@ tcp_timer_rexmt(void * xtp)
* minmss.
*/
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
V_tcp_pmtud_blackhole_activated_min_mss++;
TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss);
}
#endif
#if defined(INET6) && defined(INET)
@ -791,7 +768,7 @@ tcp_timer_rexmt(void * xtp)
if (tp->t_maxseg > V_tcp_pmtud_blackhole_mss) {
/* Use the sysctl tuneable blackhole MSS. */
tp->t_maxseg = V_tcp_pmtud_blackhole_mss;
V_tcp_pmtud_blackhole_activated++;
TCPSTAT_INC(tcps_pmtud_blackhole_activated);
} else {
/* Use the default MSS. */
tp->t_maxseg = V_tcp_mssdflt;
@ -800,7 +777,7 @@ tcp_timer_rexmt(void * xtp)
* minmss.
*/
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
V_tcp_pmtud_blackhole_activated_min_mss++;
TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss);
}
#endif
/*
@ -823,7 +800,7 @@ tcp_timer_rexmt(void * xtp)
tp->t_flags2 |= TF2_PLPMTU_PMTUD;
tp->t_flags2 &= ~TF2_PLPMTU_BLACKHOLE;
tp->t_maxseg = tp->t_pmtud_saved_maxseg;
V_tcp_pmtud_blackhole_failed++;
TCPSTAT_INC(tcps_pmtud_blackhole_failed);
/*
* Reset the slow-start flight size as it
* may depend on the new MSS.

5
sys/netinet/tcp_var.h
View File

@ -580,6 +580,11 @@ struct tcpstat {
uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */
uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */
/* Path MTU Discovery Black Hole Detection related stats */
uint64_t tcps_pmtud_blackhole_activated; /* Black Hole Count */
uint64_t tcps_pmtud_blackhole_activated_min_mss; /* BH at min MSS Count */
uint64_t tcps_pmtud_blackhole_failed; /* Black Hole Failure Count */
uint64_t _pad[12]; /* 6 UTO, 6 TBD */
};

2
sys/sys/param.h
View File

@ -58,7 +58,7 @@
* in the range 5 to 9.
*/
#undef __FreeBSD_version
#define __FreeBSD_version 1200041 /* Master, propagated to newvers */
#define __FreeBSD_version 1200042 /* Master, propagated to newvers */
/*
* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,

14
usr.bin/netstat/inet.c
View File

@ -752,12 +752,24 @@ tcp_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
"{N:/time%s unexpected signature received}\n");
p(tcps_sig_err_nosigopt, "\t{:no-signature-provided/%ju} "
"{N:/time%s no signature provided by segment}\n");
xo_close_container("tcp-signature");
xo_open_container("pmtud");
p(tcps_pmtud_blackhole_activated, "\t{:pmtud-activated/%ju} "
"{N:/Path MTU discovery black hole detection activation%s}\n");
p(tcps_pmtud_blackhole_activated_min_mss,
"\t{:pmtud-activated-min-mss/%ju} "
"{N:/Path MTU discovery black hole detection min MSS activation%s}\n");
p(tcps_pmtud_blackhole_failed, "\t{:pmtud-failed/%ju} "
"{N:/Path MTU discovery black hole detection failure%s}\n");
#undef p
#undef p1a
#undef p2
#undef p2a
#undef p3
xo_close_container("tcp-signature");
xo_close_container("pmtud");
xo_open_container("TCP connection count by state");
xo_emit("{T:/TCP connection count by state}:\n");