[ovs-discuss] Action "mod_nw_tos:<tos>" for OPENFLOW13

LIU Yulong liuyulong.xa at gmail.com
Tue Jul 13 02:39:37 UTC 2021


Thank you guys, "set_field" works now, the input command line is:
"""
ovs-ofctl add-flow -O OpenFlow13 br-int
"hard_timeout=0,idle_timeout=0,priority=65535,cookie=17142212024999476593,in_port=2,table=0,ip,reg2=0,actions=set_field:16->ip_dscp,load:55->NXM_NX_REG2[0..5],resubmit(,0)"
"""

The command "ovs-ofctl dump-flows br-int -O OPENFLOW10" results:
"""
 cookie=0xede55f036e85fd71, duration=1.537s, table=0, n_packets=0,
n_bytes=0, priority=65535,ip,reg2=0,in_port="patch-tun"
actions=mod_nw_tos:64,load:0x37->NXM_NX_REG2[0..5],resubmit(,0)
"""

"ovs-ofctl dump-flows br-int -O OPENFLOW13" results:
"""
 cookie=0xede55f036e85fd71, duration=115.497s, table=0, n_packets=0,
n_bytes=0, priority=65535,ip,reg2=0,in_port="patch-tun"
actions=set_field:16->ip_dscp,load:0x37->NXM_NX_REG2[0..5],resubmit(,0)
"""


On Tue, Jul 13, 2021 at 12:14 AM Ben Pfaff <blp at ovn.org> wrote:
>
> On Mon, Jul 12, 2021 at 03:13:13PM +0800, LIU Yulong wrote:
> > Recently, I tested OpenStack Neutron with DSCP marking functions. But, I
> > met some errors related to the action "mod_nw_tos:<tos>", the command line
> > input is:
> >
> > """
> > ovs-ofctl add-flow -O OpenFlow13 br-int
> > "hard_timeout=0,idle_timeout=0,priority=65535,cookie=17142212024999476593,in_port=2,table=0,reg2=0,actions=mod_nw_tos:64,load:55->NXM_NX_REG2[0..5],resubmit(,0)"
> > """
> >
> > The error output is:
> > """
> > ovs-ofctl: none of the usable flow formats (NXM+table_id) is among the
> > allowed flow formats (OXM-OpenFlow13)
> > """
> > Action "mod_nw_tos:<tos>" is causing the error here.
> >
> > So, I would ask which action for OPENFLOW13 is to do same work of
> > "mod_nw_tos:<tos>" for OPENFLOW10? These is no doc mentioned such action
> > for OPENFLOW13.
>
> OpenFlow 1.3 replaced all of the individual actions for setting fields
> with the more general "set_field" action.  You should be able to use
> that.  You will need to shift the TOS values two bits right to match the
> OF1.3 format, I believe.


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