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[sflow] Exception handling for if_nametoindex (#11437)#14456

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yxieca merged 1 commit intosonic-net:202205from
Gokulnath-Raja:sflow_bug#11437_port_index_mapper_interface_handling_202205
Apr 18, 2023
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[sflow] Exception handling for if_nametoindex (#11437)#14456
yxieca merged 1 commit intosonic-net:202205from
Gokulnath-Raja:sflow_bug#11437_port_index_mapper_interface_handling_202205

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@Gokulnath-Raja Gokulnath-Raja commented Mar 29, 2023 

 catch system error and log as warning level instead of
 error level in case interface was already deleted

Why I did it
sflow process exited when failed to convert the interface index from interface name

How I did it
Added exception handling code and logged when OSError exception.

How to verify it
Recreated the bug scenario #11437 and ensured that sflow process not exited.

Description for the changelog
catch system error and log as warning level instead of
error level in case interface was already deleted.

Logs
steps :

root@sonic:~# sudo config vlan member del 4094 PortChannel0001
root@sonic:~# sudo config vlan member del 4094 Ethernet2
root@sonic:~# sudo config vlan del 4094
root@sonic:~#

"WARNING sflow#port_index_mapper: no interface with this name" is  seen but no crash is reported

syslogs :

Jan 23 09:17:24.420448 sonic NOTICE swss#orchagent: :- removeVlanMember: Remove member Ethernet2 from VLAN Vlan4094 lid:ffe vmid:27000000000a53
Jan 23 09:17:24.420710 sonic NOTICE swss#orchagent: :- flushFdbEntries: flush key: SAI_OBJECT_TYPE_FDB_FLUSH:oid:0x21000000000000, fields: 3
Jan 23 09:17:24.420847 sonic NOTICE swss#orchagent: :- recordFlushFdbEntries: flush key: SAI_OBJECT_TYPE_FDB_FLUSH:oid:0x21000000000000, fields: 3
Jan 23 09:17:24.426082 sonic NOTICE syncd#syncd: :- processFdbFlush: fdb flush succeeded, updating redis database
Jan 23 09:17:24.426242 sonic NOTICE syncd#syncd: :- processFlushEvent: received a flush port fdb event, portVid = oid:0x3a000000000a52, bvId = oid:0x26000000000a51
Jan 23 09:17:24.426374 sonic NOTICE syncd#syncd: :- processFlushEvent: pattern ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY:*oid:0x26000000000a51*, portStr oid:0x3a000000000a52
Jan 23 09:17:24.427104 sonic NOTICE bgp#fpmsyncd: :- onRouteMsg: RouteTable del msg for route with only one nh on eth0/docker0: fe80::/64 :: eth0
Jan 23 09:17:24.427182 sonic NOTICE bgp#fpmsyncd: :- onRouteMsg: RouteTable del msg for route with only one nh on eth0/docker0: fd00::/80 :: docker0
Jan 23 09:17:24.428502 sonic NOTICE swss#orchagent: :- meta_sai_on_fdb_flush_event_consolidated: processing consolidated fdb flush event of type: SAI_FDB_ENTRY_TYPE_DYNAMIC
Jan 23 09:17:24.429058 sonic NOTICE swss#orchagent: :- meta_sai_on_fdb_flush_event_consolidated: fdb flush took 0.000606 sec
Jan 23 09:17:24.431496 sonic NOTICE swss#orchagent: :- setHostIntfsStripTag: Set SAI_HOSTIF_VLAN_TAG_STRIP to host interface: Ethernet2
Jan 23 09:17:24.431675 sonic NOTICE swss#orchagent: :- flushFdbEntries: flush key: SAI_OBJECT_TYPE_FDB_FLUSH:oid:0x21000000000000, fields: 2
Jan 23 09:17:24.431797 sonic NOTICE swss#orchagent: :- recordFlushFdbEntries: flush key: SAI_OBJECT_TYPE_FDB_FLUSH:oid:0x21000000000000, fields: 2
Jan 23 09:17:24.437009 sonic NOTICE swss#orchagent: :- meta_sai_on_fdb_flush_event_consolidated: processing consolidated fdb flush event of type: SAI_FDB_ENTRY_TYPE_DYNAMIC
Jan 23 09:17:24.437532 sonic NOTICE swss#orchagent: :- meta_sai_on_fdb_flush_event_consolidated: fdb flush took 0.000514 sec
Jan 23 09:17:24.437942 sonic NOTICE syncd#syncd: :- processFdbFlush: fdb flush succeeded, updating redis database
Jan 23 09:17:24.438065 sonic NOTICE syncd#syncd: :- processFlushEvent: received a flush port fdb event, portVid = oid:0x3a000000000a52, bvId = oid:0x0
Jan 23 09:17:24.438173 sonic NOTICE syncd#syncd: :- processFlushEvent: pattern ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY:*, portStr oid:0x3a000000000a52
Jan 23 09:17:24.440348 sonic NOTICE swss#orchagent: :- removeBridgePort: Remove bridge port Ethernet2 from default 1Q bridgeJan 23 09:17:29.782554 sonic NOTICE swss#orchagent: :- removeVlan: VLAN Vlan4094 still has 1 FDB entries
Jan 23 09:17:29.791373 sonic WARNING sflow#port_index_mapper: no interface with this name

@Gokulnath-Raja
[sflow] Exception handling for if_nametoindex (sonic-net#11437)
1f3f29b 
     catch system error and log as warning level instead of
     error level in case interface was already deleted

Signed-off-by: Gokulnath-Raja <Gokulnath_R@dell.com>
@Gokulnath-Raja Gokulnath-Raja marked this pull request as ready for review March 29, 2023 09:33
@Gokulnath-Raja Gokulnath-Raja requested a review from lguohan as a code owner March 29, 2023 09:33
@Gokulnath-Raja Gokulnath-Raja mentioned this pull request Mar 29, 2023
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lguohan commented Apr 10, 2023

@yxieca to check

@yxieca yxieca merged commit 60f9602 into sonic-net:202205 Apr 18, 2023
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@yxieca yxieca yxieca approved these changes

@lguohan lguohan Awaiting requested review from lguohan lguohan is a code owner

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@Gokulnath-Raja @lguohan @yxieca @dgsudharsan