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NAT : Update the CRM used counters for SNAT and DNAT entries (sonic-n…
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…et#1655)

Issue : CRM used counters are not getting updated for SNAT and DNAT entries

Steps to recreate:
Add a static NAT entry and verify the CRM counters

root@sonic:/home/admin# config nat feature enable
root@sonic:/home/admin# config interface ip add Ethernet9 12.12.0.1/24
root@sonic:/home/admin# config interface ip add Ethernet11 125.56.90.12/24
root@sonic:/home/admin# config nat add interface Ethernet11 -nat_zone 1
root@sonic:/home/admin# 
root@sonic:/home/admin# config nat add static basic 125.56.90.8 12.12.0.2
root@sonic:/home/admin# show nat translations 

Static NAT Entries         ..................... 2
Static NAPT Entries        ..................... 0
Dynamic NAT Entries        ..................... 0
Dynamic NAPT Entries       ..................... 0
Static Twice NAT Entries   ..................... 0
Static Twice NAPT Entries  ..................... 0
Dynamic Twice NAT Entries  ..................... 0
Dynamic Twice NAPT Entries ..................... 0
Total SNAT/SNAPT Entries   ..................... 1
Total DNAT/DNAPT Entries   ..................... 1
Total Entries              ..................... 2

Protocol    Source     Destination    Translated Source    Translated Destination
----------  ---------  -------------  -------------------  ------------------------
all         12.12.0.2  ---            125.56.90.8          ---
all         ---        125.56.90.8    ---                  12.12.0.2

root@sonic:/home/admin#

=============After polling interval of 300 seconds ========

root@sonic:/home/admin# crm show resources snat

Resource Name    Used Count   Available Count
--------------- ------------ -----------------
snat_entry                0             1024

root@sonic:/home/admin#

root@sonic:/home/admin# crm show resources dnat

Resource Name    Used Count    Available Count
--------------- ------------ -----------------
dnat_entry                0             1024

root@sonic:/home/admin#
Fix: Increment/Decrement the crm used counters for snat/dnat entries when entry is created/deleted.

Repeated the same steps to add static nat entry like above and verified the crm counters.

root@sonic:/home/admin# crm show resources dnat

Resource Name     Used Count   Available Count
--------------- ------------ -----------------
dnat_entry                1             1023

root@sonic:/home/admin# crm show resources snat

Resource Name     Used Count   Available Count
--------------- ------------ -----------------
snat_entry                1             1023

root@sonic:/home/admin#

Signed-off-by: Akhilesh Samineni akhilesh.samineni@broadcom.com
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AkhileshSamineni committed Apr 9, 2021
1 parent a4e05a7 commit 97f70d1
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Showing 2 changed files with 85 additions and 3 deletions.
10 changes: 10 additions & 0 deletions orchagent/natorch.cpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,9 @@
#include "natorch.h"
#include "notifier.h"
#include "sai_serialize.h"
#include "crmorch.h"

extern CrmOrch *gCrmOrch;
extern PortsOrch *gPortsOrch;
extern sai_object_id_t gSwitchId;
extern sai_switch_api_t *sai_switch_api;
Expand Down Expand Up @@ -790,6 +792,7 @@ bool NatOrch::addHwDnatEntry(const IpAddress &ip_address)

updateNatCounters(ip_address, 0, 0);
m_natEntries[ip_address].addedToHw = true;
gCrmOrch->incCrmResUsedCounter(CrmResourceType::CRM_DNAT_ENTRY);

if (entry.entry_type == "static")
{
Expand Down Expand Up @@ -876,6 +879,7 @@ bool NatOrch::addHwDnaptEntry(const NaptEntryKey &key)

m_naptEntries[key].addedToHw = true;
updateNaptCounters(key.prototype.c_str(), key.ip_address, key.l4_port, 0, 0);
gCrmOrch->incCrmResUsedCounter(CrmResourceType::CRM_DNAT_ENTRY);

if (entry.entry_type == "static")
{
Expand Down Expand Up @@ -947,6 +951,7 @@ bool NatOrch::removeHwDnatEntry(const IpAddress &dstIp)
entry.entry_type.c_str(), dstIp.to_string().c_str(), entry.translated_ip.to_string().c_str());

deleteNatCounters(dstIp);
gCrmOrch->decCrmResUsedCounter(CrmResourceType::CRM_DNAT_ENTRY);

if (entry.entry_type == "static")
{
Expand Down Expand Up @@ -1138,6 +1143,7 @@ bool NatOrch::removeHwDnaptEntry(const NaptEntryKey &key)
entry.translated_ip.to_string().c_str(), entry.translated_l4_port);

deleteNaptCounters(key.prototype.c_str(), key.ip_address, key.l4_port);
gCrmOrch->decCrmResUsedCounter(CrmResourceType::CRM_DNAT_ENTRY);

if (entry.entry_type == "static")
{
Expand Down Expand Up @@ -1336,6 +1342,7 @@ bool NatOrch::addHwSnatEntry(const IpAddress &ip_address)
updateNatCounters(ip_address, 0, 0);
m_natEntries[ip_address].addedToHw = true;
m_natEntries[ip_address].activeTime = time_now.tv_sec;
gCrmOrch->incCrmResUsedCounter(CrmResourceType::CRM_SNAT_ENTRY);

if (entry.entry_type == "static")
{
Expand Down Expand Up @@ -1514,6 +1521,7 @@ bool NatOrch::addHwSnaptEntry(const NaptEntryKey &keyEntry)
m_naptEntries[keyEntry].activeTime = time_now.tv_sec;

updateNaptCounters(keyEntry.prototype.c_str(), keyEntry.ip_address, keyEntry.l4_port, 0, 0);
gCrmOrch->incCrmResUsedCounter(CrmResourceType::CRM_SNAT_ENTRY);

if (entry.entry_type == "static")
{
Expand Down Expand Up @@ -1670,6 +1678,7 @@ bool NatOrch::removeHwSnatEntry(const IpAddress &ip_address)
}
deleteNatCounters(ip_address);
m_natEntries.erase(ip_address);
gCrmOrch->decCrmResUsedCounter(CrmResourceType::CRM_SNAT_ENTRY);

if (entry.entry_type == "static")
{
Expand Down Expand Up @@ -1760,6 +1769,7 @@ bool NatOrch::removeHwSnaptEntry(const NaptEntryKey &keyEntry)
}
deleteNaptCounters(keyEntry.prototype.c_str(), keyEntry.ip_address, keyEntry.l4_port);
m_naptEntries.erase(keyEntry);
gCrmOrch->decCrmResUsedCounter(CrmResourceType::CRM_SNAT_ENTRY);

if (entry.entry_type == "static")
{
Expand Down
78 changes: 75 additions & 3 deletions tests/test_nat.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -287,9 +287,6 @@ def test_DelTwiceNaPtStaticEntry(self, dvs, testlog):
#check the entry is not there in asic db
self.asic_db.wait_for_n_keys("ASIC_STATE:SAI_OBJECT_TYPE_NAT_ENTRY", 0)

# clear interfaces
self.clear_interfaces(dvs)

def test_VerifyConntrackTimeoutForNatEntry(self, dvs, testlog):
# get neighbor and arp entry
dvs.servers[0].runcmd("ping -c 1 18.18.18.2")
Expand Down Expand Up @@ -353,6 +350,81 @@ def test_DoNotNatAclAction(self, dvs_acl, testlog):
dvs_acl.remove_acl_table(L3_TABLE_NAME)
dvs_acl.verify_acl_table_count(0)

def test_CrmSnatAndDnatEntryUsedCount(self, dvs, testlog):
# initialize
self.setup_db(dvs)

# get neighbor and arp entry
dvs.servers[0].runcmd("ping -c 1 18.18.18.2")

# set pooling interval to 1
dvs.runcmd("crm config polling interval 1")

dvs.setReadOnlyAttr('SAI_OBJECT_TYPE_SWITCH', 'SAI_SWITCH_ATTR_AVAILABLE_SNAT_ENTRY', '1000')
dvs.setReadOnlyAttr('SAI_OBJECT_TYPE_SWITCH', 'SAI_SWITCH_ATTR_AVAILABLE_DNAT_ENTRY', '1000')

time.sleep(2)

# get snat counters
used_snat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_snat_entry_used')
avail_snat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_snat_entry_available')

# get dnat counters
used_dnat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_dnat_entry_used')
avail_dnat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_dnat_entry_available')

# add a static nat entry
dvs.runcmd("config nat add static basic 67.66.65.1 18.18.18.2")

#check the entry in asic db, 3 keys = SNAT, DNAT and DNAT_Pool
keys = self.asic_db.wait_for_n_keys("ASIC_STATE:SAI_OBJECT_TYPE_NAT_ENTRY", 3)
for key in keys:
if (key.find("dst_ip:67.66.65.1")) or (key.find("src_ip:18.18.18.2")):
assert True
else:
assert False

dvs.setReadOnlyAttr('SAI_OBJECT_TYPE_SWITCH', 'SAI_SWITCH_ATTR_AVAILABLE_SNAT_ENTRY', '999')
dvs.setReadOnlyAttr('SAI_OBJECT_TYPE_SWITCH', 'SAI_SWITCH_ATTR_AVAILABLE_DNAT_ENTRY', '999')

time.sleep(2)

# get snat counters
new_used_snat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_snat_entry_used')
new_avail_snat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_snat_entry_available')

# get dnat counters
new_used_dnat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_dnat_entry_used')
new_avail_dnat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_dnat_entry_available')

assert new_used_snat_counter - used_snat_counter == 1
assert avail_snat_counter - new_avail_snat_counter == 1
assert new_used_dnat_counter - used_dnat_counter == 1
assert avail_dnat_counter - new_avail_dnat_counter == 1

# delete a static nat entry
dvs.runcmd("config nat remove static basic 67.66.65.1 18.18.18.2")

dvs.setReadOnlyAttr('SAI_OBJECT_TYPE_SWITCH', 'SAI_SWITCH_ATTR_AVAILABLE_SNAT_ENTRY', '1000')
dvs.setReadOnlyAttr('SAI_OBJECT_TYPE_SWITCH', 'SAI_SWITCH_ATTR_AVAILABLE_DNAT_ENTRY', '1000')

time.sleep(2)

# get snat counters
new_used_snat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_snat_entry_used')
new_avail_snat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_snat_entry_available')

# get dnat counters
new_used_dnat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_dnat_entry_used')
new_avail_dnat_counter = dvs.getCrmCounterValue('STATS', 'crm_stats_dnat_entry_available')

assert new_used_snat_counter == used_snat_counter
assert new_avail_snat_counter == avail_snat_counter
assert new_used_dnat_counter == used_dnat_counter
assert new_avail_dnat_counter == avail_dnat_counter

# clear interfaces
self.clear_interfaces(dvs)

# Add Dummy always-pass test at end as workaroud
# for issue when Flaky fail on final test it invokes module tear-down before retrying
Expand Down

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