[Multiasic]: Provide namespace support for ipNetToMediaPhysAddress #129

SuvarnaMeenakshi · 2020-05-01T16:42:27Z

MIB in rfc1213.

Signed-off-by: SuvarnaMeenakshi sumeenak@microsoft.com

- What I did
Provide namespace support for ipNetToMediaPhysAddress MIB.

- How I did it
In multi-asic platform, retrieve host arp information from kernel using python_arptable.
Retrieve namespace arp information from NEIGH_TABLE in APP_DB.
For single-asic platform - Implementation modified to read NEIGH_TABLE in APP_DB.

- How to verify it
Tested on single-asic platform to make sure the output is the same as before the changes were added.
Tested on multi-asic platform.

- Description for the changelog

MIB in rfc1213. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

qiluo-msft · 2020-05-05T19:14:07Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

+
+    def update_data(self):
+        self.arp_dest_map = {}
+        self.arp_dest_list = []


No need if you immediately assign them. #Closed

qiluo-msft · 2020-05-05T19:19:20Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

+                dest_map, dest_list = self.get_arp_table()
+                self.arp_dest_map.update(dest_map)
+                self.arp_dest_list.extend(dest_list)
+                # Revert back to original namespace


Revert back to original namespace [](start = 16, length = 35)

Could you revert back only at the end of loop? #Closed

Modified implementation to use NEIGH_TABLE instead of using linux namespace.

qiluo-msft · 2020-05-05T19:20:24Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

+            for ns in self.ns_list:
+                dest_map = {}
+                dest_list = []
+                ns_fd = open(mibs.get_netns_path(nsname = ns))


ns_fd = open(mibs.get_netns_path(nsname = ns)) [](start = 16, length = 46)

use with statement, no need to close explicitly #Closed

vModified implementation to use NEIGH_TABLE instead of using linux namespace.

qiluo-msft · 2020-05-05T19:21:38Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

+                self.arp_dest_map.update(dest_map)
+                self.arp_dest_list.extend(dest_list)
+                # Revert back to original namespace
+                mibs.setns(current_fd, mibs.CLONE_NEWNET)


mibs.setns(current_fd, mibs.CLONE_NEWNET) [](start = 16, length = 41)

Use a finally to make sure it is executed even there is exception? #Closed

Modified implementation to use NEIGH_TABLE instead of using linux namespace.

qiluo-msft · 2020-05-05T19:27:47Z

src/sonic_ax_impl/mibs/__init__.py

@@ -8,6 +10,10 @@
 from ax_interface.util import oid2tuple
 from sonic_ax_impl import logger

+libc = cdll.LoadLibrary('libc.so.6')


libc [](start = 0, length = 4)

handle exception or error? #Closed

Removed, not used anymore.

qiluo-msft · 2020-05-05T19:30:27Z

src/sonic_ax_impl/mibs/__init__.py


 redis_kwargs = {'unix_socket_path': '/var/run/redis/redis.sock'}

+def setns(fd, nstype):


setns [](start = 4, length = 5)

These new features has nothing to do with mibs, and it may be reused outside this repo? Could you move into a common repo? Better to encapsulate a class. #Closed

Removed this.

qiluo-msft · 2020-05-05T19:31:24Z

src/sonic_ax_impl/mibs/__init__.py


 redis_kwargs = {'unix_socket_path': '/var/run/redis/redis.sock'}

+def setns(fd, nstype):
+    if hasattr(fd, 'fileno'):
+        fd = fd.fileno()


Why we need the flexibility? #Closed

removed this function, not using this.

qiluo-msft · 2020-05-05T19:32:34Z

src/sonic_ax_impl/mibs/__init__.py

+    _setns(fd, nstype)
+
+def get_netns_path(nspath=None, nsname=None, nspid=None):
+    if nsname:


nsname [](start = 7, length = 6)

check it is a string. #Closed

qiluo-msft · 2020-05-05T19:33:12Z

src/sonic_ax_impl/mibs/__init__.py

+
+def get_netns_path(nspath=None, nsname=None, nspid=None):
+    if nsname:
+        if (os.path.isdir(NET_NS_PATH) == False):


os.path.isdir(NET_NS_PATH) [](start = 12, length = 26)

We only need to check this path once? #Closed

qiluo-msft · 2020-05-05T19:37:09Z

src/sonic_ax_impl/mibs/__init__.py

+        fd = fd.fileno()
+    _setns(fd, nstype)
+
+def get_netns_path(nspath=None, nsname=None, nspid=None):


nspath=None [](start = 19, length = 11)

Can you remove it from arg list? #Closed

qiluo-msft · 2020-05-05T19:37:33Z

src/sonic_ax_impl/mibs/__init__.py

+        fd = fd.fileno()
+    _setns(fd, nstype)
+
+def get_netns_path(nspath=None, nsname=None, nspid=None):


nsname=None, nspid=None [](start = 32, length = 23)

Better to separate into 2 functions. #Closed

qiluo-msft · 2020-05-05T19:38:26Z

src/sonic_ax_impl/mibs/__init__.py

+
+def get_netns_path(nspath=None, nsname=None, nspid=None):
+    if nsname:
+        if (os.path.isdir(NET_NS_PATH) == False):


Suggested change

if (os.path.isdir(NET_NS_PATH) == False):

if not os.path.isdir(NET_NS_PATH):

``` #Closed

Removed this function, not used.

qiluo-msft · 2020-05-05T19:39:05Z

src/sonic_ax_impl/mibs/__init__.py

+        if ns_list is None:
+            return None
+        else:
+            return ns_list


Just return ns_list #Closed

Removed this, not used.

qiluo-msft · 2020-05-05T19:41:09Z

src/sonic_ax_impl/mibs/__init__.py

+        nspath = '/proc/%d/ns/net' % nspid
+    return nspath
+
+def get_namespace_list():


get_namespace_list [](start = 4, length = 18)

Add some unit tests #Closed

Added unit-tests

qiluo-msft · 2020-05-05T19:41:18Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

+            arp_dest_list.append(subid)
+        return arp_dest_map, arp_dest_list
+
+    def update_data(self):


update_data [](start = 8, length = 11)

Add some unit tests #Closed

Added unit-tests

qiluo-msft

As comments

lguohan · 2020-05-21T06:19:50Z

why not use the neighbor table information in the app db?

lguohan

please switch to use neighbor table in app db.

SuvarnaMeenakshi · 2020-05-23T00:47:52Z

please switch to use neighbor table in app db.

sure, will update the changes.

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

namespaces. Add function to retrieve data from NEIGH_TABLE in APP_DB of each namespace. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

qiluo-msft · 2020-07-07T21:54:56Z

src/sonic_ax_impl/mibs/__init__.py

@@ -62,6 +62,13 @@

 redis_kwargs = {'unix_socket_path': '/var/run/redis/redis.sock'}

+
+def get_neigh_info(neigh_key):
+    neigh_key = neigh_key[neigh_key.find(':')+1:len(neigh_key)]


':' [](start = 41, length = 3)

Instead of hard-coded, could you get it by get_separator(). But only call this function minimal times.

Fixed this, to only split neigh_key information of IPv4 neigh address.

qiluo-msft · 2020-07-07T22:02:38Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

+    def reinit_data(self):
+        if len(self.db_conn) > 1:
+            Namespace.connect_all_dbs(self.db_conn, mibs.APPL_DB)
+            self.neigh_key_list = Namespace.dbs_keys_namespace(self.db_conn, mibs.APPL_DB, "NEIGH_TABLE:*")


dbs_keys_namespace [](start = 44, length = 18)

Function does not exist. #Closed

Requires PR#137

Added function as PR #137 is not merged yet.

qiluo-msft · 2020-07-07T22:48:20Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

+            neigh_str = neigh_key.decode()
+            db_index = self.neigh_key_list[neigh_key]
+            dev, ip = mibs.get_neigh_info(neigh_str)
+            """


""" [](start = 12, length = 3)

Docstrings are for all public modules, functions, classes, and methods. Here '# ' will be better. #Closed

src/sonic_ax_impl/mibs/ietf/rfc1213.py

qiluo-msft · 2020-07-07T23:07:32Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

+            """
+            if dev == "eth0":
+                continue
+            neigh_info = self.db_conn[db_index].get_all(mibs.APPL_DB, neigh_key, blocking=True)


get_all [](start = 48, length = 7)

Did you call get_all too many times? #Closed

for all NEIGH_TABLE keys, we have to call get_all

qiluo-msft · 2020-07-07T23:09:05Z

tests/test_arp.py

@@ -22,6 +22,7 @@
 class TestSonicMIB(TestCase):
    @classmethod
    def setUpClass(cls):
+        tests.mock_tables.python_arptable.arp_filename = '/arp.txt'


arp_filename [](start = 42, length = 12)

Not used? #Closed

This is used in mock python_arptable.
For single namespace, we will use arp.txt - this will have mgmt interfaces and front panel interfaces data.
For multiple namespace, we use host_arp.txt - this have only mgmt interface related data.
Rest of namespace information will be retrieved from mock appl_db.json.

This is to test single ASIC, and we don't need to mock kernel ARP any more?

In reply to: 451193110 [](ancestors = 451193110)

Yes, we don't need this, fixed.

qiluo-msft · 2020-07-07T23:10:06Z

tests/mock_tables/host_arp.txt

@@ -0,0 +1,46 @@
+IP address       HW type     Flags       HW address            Mask     Device


IP address [](start = 0, length = 10)

Delete original tests/mock_tables/arp.txt file? #Closed

qiluo-msft · 2020-07-07T23:12:54Z

tests/mock_tables/asic0/appl_db.json

@@ -86,5 +86,17 @@
  "INTF_TABLE:PortChannel01:10.10.0.1/31": {
    "scope": "global",
    "family": "IPv4"
+  },
+  "NEIGH_TABLE:Ethernet0:10.0.0.0": {


10.0.0.0 [](start = 25, length = 8)

Add some mock data for IPv6
Add some mock data for PortChannel
Will new mock data need more test cases? #Closed

Added data for IPv6 and Port Channel. Added one more test case to make sure that eth0 of namespace, which is a part of docker0 bridge, is not used, for multi-asic platform.

qiluo-msft · 2020-07-07T23:13:40Z

tests/namespace/test_arp.py

+        # for updater in self.lut.updater_instances:
+            # updater.update_data()
+            # updater.reinit_data()
+            # updater.update_data()


Is it working?
Or remove it? #Closed

removed it.

It is not there in the latest file.
d728e97

qiluo-msft · 2020-07-07T23:30:46Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

+        from kernel and namespace arp table from NEIGH_TABLE in APP_DB
+        in each namespace.
+        """
+        self._update_host_data()


_update_host_data [](start = 13, length = 17)

For single ASIC, we should treat 'NEIGH_TABLE' as the ground truth. No need to check arp_table.
And we need to adjust test for single ASIC. #Closed

Updated to read 'NEIGH_TABLE' for single asic as well. Updated mock db to reflect this change.

Changes made so that for single asic platform, arp table information is retrieved from NEIGH_TABLE. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

mock arp.txt file as data will be retrieved from APPL_DB. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

namespace or docker's eth0 information is not retrieved. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

…pport

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

as information is retrieved from NEIGH_TABLE. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

qiluo-msft · 2020-07-21T19:04:19Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

+        for neigh_key in self.neigh_key_list:
+            neigh_str = neigh_key.decode()
+            db_index = self.neigh_key_list[neigh_key]
+            neigh_info = self.db_conn[db_index].get_all(mibs.APPL_DB, neigh_key, blocking=True)


blocking=True [](start = 81, length = 13)

Let's use non blocking, which make snmpagent robust even if there is an issue in any namespace, such as process crash, DB corruption. #Closed

Updated as per review comment.

Non blocking may return a None (please verify), then you need to handle this corner case.

In reply to: 458323712 [](ancestors = 458323712)

Added check, will continue with other keys if None is returned on get_all on any key.

to make sure snmpagent is robust even if there is issue in any one namespace. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

qiluo-msft · 2020-07-21T19:15:10Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

        for entry in python_arptable.get_arp_table():
            dev = entry['Device']
            mac = entry['HW address']
            ip = entry['IP address']
+            self._update_arp_info(dev, mac, ip)
+
+    def _update_namespace_data(self):


_update_namespace_data [](start = 8, length = 22)

_update_from_db #Closed

qiluo-msft · 2020-07-21T19:15:55Z

src/sonic_ax_impl/mibs/ietf/rfc1213.py

+        Namespace.connect_all_dbs(self.db_conn, mibs.APPL_DB)
+        self.neigh_key_list = Namespace.dbs_keys_namespace(self.db_conn, mibs.APPL_DB, "NEIGH_TABLE:*")
+
+    def _update_host_data(self):


_update_host_data [](start = 8, length = 17)

_update_from_arptable #Closed

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

lgtm-com · 2020-07-21T19:30:36Z

This pull request introduces 1 alert when merging 70633d6 into c702a57 - view on LGTM.com

new alerts:

1 for Testing equality to None

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

qiluo-msft · 2020-07-28T19:28:21Z

For single-asic platform - not change.

I think this description is not up to date.

SuvarnaMeenakshi · 2020-07-28T19:34:01Z

For single-asic platform - not change.

I think this description is not up to date.

Updated description.

) * [Multiasic]: Provide namespace support for ipNetToMediaPhysAddress MIB in rfc1213. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com> * [Namespace][ArpUpdater]: Update ArpUpdater to support multiple namespaces. Add function to retrieve data from NEIGH_TABLE in APP_DB of each namespace. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com> * Updated as per review comments. Changes made so that for single asic platform, arp table information is retrieved from NEIGH_TABLE. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

SuvarnaMeenakshi added 2 commits May 1, 2020 09:35

[Multiasic]: Provide namespace support for ipNetToMediaPhysAddress

bb37b22

MIB in rfc1213. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

Minor correction.

8228748

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

SuvarnaMeenakshi requested a review from qiluo-msft May 5, 2020 18:37

qiluo-msft reviewed May 5, 2020

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qiluo-msft requested changes May 5, 2020

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SuvarnaMeenakshi mentioned this pull request May 21, 2020

[Multiasic]: Mount network namespace on SNMP docker sonic-net/sonic-buildimage#4537

Closed

lguohan requested changes May 23, 2020

View reviewed changes

SuvarnaMeenakshi added 4 commits July 7, 2020 12:31

Merge remote-tracking branch 'sumeenak/master' into namespace_support

51c6954

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

Remove previous implementation logic for ArpUpdater.

18154e0

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

[Namespace][ArpUpdater]: Update ArpUpdater to support multiple

eff3a3e

namespaces. Add function to retrieve data from NEIGH_TABLE in APP_DB of each namespace. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

Minor correction.

94fa099

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

qiluo-msft reviewed Jul 7, 2020

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src/sonic_ax_impl/mibs/ietf/rfc1213.py Show resolved Hide resolved

qiluo-msft reviewed Jul 7, 2020

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SuvarnaMeenakshi added 6 commits July 20, 2020 15:53

Updated as per review comments.

d4dcbcc

Changes made so that for single asic platform, arp table information is retrieved from NEIGH_TABLE. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

Add NEIGH_TABLE information in mock APPL_DB. Remove

81dfe7b

mock arp.txt file as data will be retrieved from APPL_DB. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

Add new namespace arp test case to make sure that

d728e97

namespace or docker's eth0 information is not retrieved. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

Merge remote-tracking branch 'remotes/azure/master' into namespace_su…

d001a8e

…pport

Fix mock db.

74063f7

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

Remove usage of mock arp.txt file in single asic test case

f07fab7

as information is retrieved from NEIGH_TABLE. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

qiluo-msft reviewed Jul 21, 2020

View reviewed changes

Update as per review comment to use non blocking get_all

d4dbde3

to make sure snmpagent is robust even if there is issue in any one namespace. Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

qiluo-msft reviewed Jul 21, 2020

View reviewed changes

Update as per review comments.

70633d6

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

Fix LGTM comment.

dcd4038

Signed-off-by: SuvarnaMeenakshi <sumeenak@microsoft.com>

qiluo-msft approved these changes Jul 21, 2020

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SuvarnaMeenakshi requested a review from lguohan July 26, 2020 23:13

lguohan approved these changes Jul 28, 2020

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qiluo-msft approved these changes Jul 28, 2020

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SuvarnaMeenakshi merged commit d5f2b92 into sonic-net:master Jul 28, 2020

SuvarnaMeenakshi added the Request for 201911 Branch label Jul 28, 2020

abdosi added the Included in 201911 Branch label Sep 2, 2020


		redis_kwargs = {'unix_socket_path': '/var/run/redis/redis.sock'}

		def setns(fd, nstype):

	if (os.path.isdir(NET_NS_PATH) == False):
	if not os.path.isdir(NET_NS_PATH):
	``` #Closed

		@@ -0,0 +1,46 @@
		IP address HW type Flags HW address Mask Device

[Multiasic]: Provide namespace support for ipNetToMediaPhysAddress #129

[Multiasic]: Provide namespace support for ipNetToMediaPhysAddress #129

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SuvarnaMeenakshi commented May 1, 2020 •

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