Check CRM limit for route performance test

[vaibhavhd]

Description of PR

Summary: Fix test_route_perf test failure - L3 route add failed with error Table full

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

Approach

What is the motivation for this PR?

Failure of test_route_perf in S6100 platforms
The test_route_perf test adds the ipv4 and ipv6 routes based on the input arg --num_routes (default 10000 routes)
This test fails where the available limit is less than the number of routes being added.
Error:

['Nov  3 19:08:26.930925 str-s6100-acs-5 ERR syncd#syncd: [none] _brcm_sai_l3_route_config:2078 L3 route add failed with error Table full (0xfffffffa).
ERR syncd#syncd: [none] brcm_sai_create_route_entry:413 L3 route add failed with error -13.
ERR syncd#syncd: :- processEvent: attr: SAI_ROUTE_ENTRY_ATTR_NEXT_HOP_ID: oid:0x5000000000d21
ERR syncd#syncd: :- processEvent: failed to execute api: create, key: SAI_OBJECT_TYPE_ROUTE_ENTRY:{"dest":"3000:26a0:1::/64","switch_id":"oid:0x21000000000000","vr":"oid:0x3000000000042"}, status: SAI_STATUS_TABLE_FULL
ERR syncd#syncd: :- syncd_main: Runtime error: :- processEvent: failed to execute api: create, key: SAI_OBJECT_TYPE_ROUTE_ENTRY:{"dest":"3000:26a0:1::/64","switch_id":"oid:0x21000000000000","vr":"oid:0x3000000000042"}, status: SAI_STATUS_TABLE_FULL
ERR swss#orchagent: :- on_switch_shutdown_request: Syncd stopped
WARNING syncd#syncd: :- saiDiscover: skipping since it causes crash: SAI_STP_ATTR_BRIDGE_ID
ERR syncd#syncd: [none] _brcm_sai_port_wred_stats_get:5068 Hardware failure -4 in getting WRED stat 69 for port 1
ERR syncd#syncd: [none] brcm_sai_get_port_stats:2097 port wred stats get failed with error Table empty (0xfffffffb).

How did you do it?

Added a check for setting the route addition limit based on CRM resource availability.

admin@sonic:~$ crm show resources all


Resource Name           Used Count    Available Count
--------------------  ------------  -----------------
ipv4_route                    6475              67253
ipv6_route                    6476               1716

Based on the available count, decide the number of routes to test with.

How did you verify/test it?

Tested test_route_perf test on S6100 platform and it passed without any Table Full errors.

route/test_route_perf.py::test_perf_add_remove_routes[4] passed     [ 50%]
route/test_route_perf.py::test_perf_add_remove_routes[6] passed     [100%]

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation