pptp: encapsulate statistics counters

Group the PPTP starting and active statistics in struct pptp_stat_t and keep the storage under the PPTP server object instead of exposing writable stat_* globals.  This keeps ownership inside the PPTP control code while preserving the existing CLI and ACCEL-PPP-MIB counter semantics.

Route counter updates through pptp_stat_*() helpers.  Connection setup, transition to PPP, and teardown paths no longer open-code individual counter increments/decrements; the update policy now lives beside the PPTP-owned storage and uses relaxed atomic operations for the simple state counters.

Make the CLI show-stat path render from a local snapshot and convert the PPTP SNMP starting/active scalars from watched raw pointers to scalar handlers.  SNMP now reads through pptp_stat_starting() and pptp_stat_active(), removing the old pptp_get_stat() pointer escape hatch.

Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/accel-pppd/ctrl/pptp/pptp.h b/accel-pppd/ctrl/pptp/pptp.h
new file mode 100644
index 00000000..29f24ca2
--- /dev/null
+++ b/accel-pppd/ctrl/pptp/pptp.h
@@ -0,0 +1,7 @@
+#ifndef __PPTP_H
+#define __PPTP_H
+
+unsigned int pptp_stat_starting(void);
+unsigned int pptp_stat_active(void);
+
+#endif