[ovs-discuss] addition of flows more than the maximum value in flow table

[akash sharma]

Hi,

I am trying to test the default maximum value of flow_limit in  a
flow_table.

To achieve this, I executed the following commands:

[root at user]# ovs-ofctl dump-tables br0 | less OFPST_TABLE reply (xid=0x1):
255 tables

  0: classifier: wild=0x3fffff, max=1000000, active=9

               lookup=350074, matched=231250

  1: main1   : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  2: table2  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  3: table3  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  4: table4  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  5: table5  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  6: table6  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

 :

 Using script, I added flow entries to the table 1.

On again executing dump-tables command, the result is as follows:

[root at user]# ovs-ofctl dump-tables br0 | less OFPST_TABLE reply (xid=0x1):
255 tables

  0: classifier: wild=0x3fffff, max=1000000, active=9

               lookup=350329, matched=231641

  1: table1  : wild=0x3fffff, max=1000000, active=100001

               lookup=0, matched=0

  2: table2  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  3: table3  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  4: table4  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  5: table5  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  6: table6  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

 :

In table1, the active flow entries exceed the max value.

 But when I change the max flow_limit of a table, then the scenario works
fine.

Following are the commands executed:

 [root at user]# ovs-vsctl -- --id=@t1 create Flow_Table flow-limit=2 -- set
bridge br0 flow_tables={1=@t1}

f5f725e6-b30a-499f-b053-bdca5dcbd0d8

[root at user]#

[root at user]# ovs-vsctl list flow_table

_uuid               : f5f725e6-b30a-499f-b053-bdca5dcbd0d8

flow_limit          : 2

groups              : []

name                : []

overflow_policy     : []

[root at user]# ovs-ofctl add-flow br0 "table=1, ip,nw_src=10.0.2.20
action=normal"

[root at user]# ovs-ofctl add-flow br0 "table=1, ip,nw_src=10.0.2.30
action=normal"

[root at user]# ovs-ofctl add-flow br0 "table=1, ip,nw_src=10.0.2.40
action=normal"

OFPT_ERROR (xid=0x4): OFPFMFC_ALL_TABLES_FULL (***truncated to 64 bytes
from 80***) 00000000  01 0e 00 50 00 00 00 04-00 38 00 ef 00 00 00 00
|...P.....8......| 00000010  00 00 00 00 00 00 00 00-00 00 00 00 00 00 08
00 |................| 00000020  00 00 00 00 0a 00 02 28-00 00 00 00 00 00
00 00 |.......(........| 00000030  00 00 00 00 00 00 00 00-01 00 00 00 00
00 80 00 |................|

[root at user]# [root at user]# ovs-ofctl dump-tables br0 |less OFPST_TABLE reply
(xid=0x1): 255 tables

  0: classifier: wild=0x3fffff, max=1000000, active=1

               lookup=322, matched=215

  1: table1  : wild=0x3fffff, max=     2, active=2

               lookup=0, matched=0

  2: table2  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  3: table3  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  4: table4  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  5: table5  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

  6: table6  : wild=0x3fffff, max=1000000, active=0

               lookup=0, matched=0

:

Please let me know if the above behavior is expected??


Regards,

Akash
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