T7348: Add config CPU thread-count for accel-ppp services

Accel-ppp services should not use all CPU cores to process requests.
At the moment accel-ppp services use all available CPU cores
to process requests from the subscribers (establish/update session/etc).
During mass connection of sessions, this can lead to the fact that it
utilizes all CPU, and for other services like FRR, there is not enough
CPU time to process their own stable work.

services:
 - L2TP
 - SSTP
 - PPPoE
 - IPoE
 - PPtP

Add this option configurable and use all cores if not set:

```
set service pppoe-server thread-count < all | half | x >
```
The defaultValue `all`

6 files changed, 32 insertions, 0 deletions

diff --git a/interface-definitions/include/accel-ppp/thread-count.xml.i b/interface-definitions/include/accel-ppp/thread-count.xml.i
new file mode 100644
index 000000000..84d9224d0
--- /dev/null
+++ b/interface-definitions/include/accel-ppp/thread-count.xml.i
@@ -0,0 +1,27 @@
+<!-- include start from accel-ppp/thread-count.xml.i -->
+<leafNode name="thread-count">
+  <properties>
+    <help>Number of working threads</help>
+    <completionHelp>
+      <list>all half</list>
+    </completionHelp>
+    <valueHelp>
+      <format>all</format>
+      <description>Use all available CPU cores</description>
+    </valueHelp>
+    <valueHelp>
+      <format>half</format>
+      <description>Use half of available CPU cores</description>
+    </valueHelp>
+    <valueHelp>
+      <format>u32:1-512</format>
+      <description>Thread count</description>
+    </valueHelp>
+    <constraint>
+      <validator name="numeric" argument="--range 1-512"/>
+      <regex>(all|half)</regex>
+    </constraint>
+  </properties>
+  <defaultValue>all</defaultValue>
+</leafNode>
+<!-- include end -->
diff --git a/interface-definitions/service_ipoe-server.xml.in b/interface-definitions/service_ipoe-server.xml.in
index fe9d32bbd..3093151ea 100644
--- a/interface-definitions/service_ipoe-server.xml.in
+++ b/interface-definitions/service_ipoe-server.xml.in
@@ -237,6 +237,7 @@
           #include <include/accel-ppp/max-concurrent-sessions.xml.i>
           #include <include/accel-ppp/shaper.xml.i>
           #include <include/accel-ppp/snmp.xml.i>
+          #include <include/accel-ppp/thread-count.xml.i>
           #include <include/generic-description.xml.i>
           #include <include/name-server-ipv4-ipv6.xml.i>
           #include <include/accel-ppp/log.xml.i>
diff --git a/interface-definitions/service_pppoe-server.xml.in b/interface-definitions/service_pppoe-server.xml.in
index 32215e9d2..81a4a95e3 100644
--- a/interface-definitions/service_pppoe-server.xml.in
+++ b/interface-definitions/service_pppoe-server.xml.in
@@ -175,6 +175,7 @@
           </node>
           #include <include/accel-ppp/shaper.xml.i>
           #include <include/accel-ppp/snmp.xml.i>
+          #include <include/accel-ppp/thread-count.xml.i>
           #include <include/accel-ppp/wins-server.xml.i>
           #include <include/generic-description.xml.i>
           #include <include/name-server-ipv4-ipv6.xml.i>
diff --git a/interface-definitions/vpn_l2tp.xml.in b/interface-definitions/vpn_l2tp.xml.in
index c00e82534..d28f86653 100644
--- a/interface-definitions/vpn_l2tp.xml.in
+++ b/interface-definitions/vpn_l2tp.xml.in
@@ -137,6 +137,7 @@
               #include <include/accel-ppp/ppp-options.xml.i>
               #include <include/accel-ppp/shaper.xml.i>
               #include <include/accel-ppp/snmp.xml.i>
+              #include <include/accel-ppp/thread-count.xml.i>
               #include <include/accel-ppp/wins-server.xml.i>
               #include <include/generic-description.xml.i>
               #include <include/name-server-ipv4-ipv6.xml.i>
diff --git a/interface-definitions/vpn_pptp.xml.in b/interface-definitions/vpn_pptp.xml.in
index 8aec0cb1c..3e985486d 100644
--- a/interface-definitions/vpn_pptp.xml.in
+++ b/interface-definitions/vpn_pptp.xml.in
@@ -53,6 +53,7 @@
               #include <include/accel-ppp/ppp-options.xml.i>
               #include <include/accel-ppp/shaper.xml.i>
               #include <include/accel-ppp/snmp.xml.i>
+              #include <include/accel-ppp/thread-count.xml.i>
               #include <include/accel-ppp/wins-server.xml.i>
               #include <include/generic-description.xml.i>
               #include <include/name-server-ipv4-ipv6.xml.i>
diff --git a/interface-definitions/vpn_sstp.xml.in b/interface-definitions/vpn_sstp.xml.in
index 5fd5c95ca..851a202dc 100644
--- a/interface-definitions/vpn_sstp.xml.in
+++ b/interface-definitions/vpn_sstp.xml.in
@@ -50,6 +50,7 @@
           #include <include/accel-ppp/ppp-options.xml.i>
           #include <include/accel-ppp/shaper.xml.i>
           #include <include/accel-ppp/snmp.xml.i>
+          #include <include/accel-ppp/thread-count.xml.i>
           #include <include/accel-ppp/wins-server.xml.i>
           #include <include/generic-description.xml.i>
           #include <include/name-server-ipv4-ipv6.xml.i>