In PicOS-2.1, if user enables the Class of Service (CoS) mapping, the packet will be mapped to a physical queue (0-7). With DSCP (0-7), it maps to queue-0 and with DSCP (8-16), it maps to queue-1 and so on. Queue-7 has the highest priority. Enable the CoS Mapping as follows:

admin@PicOS-OVS$ovs-vsctl set-cos-map true 
 
admin@PicOS-OVS$ovs-vsctl show-cos-map
cos mapping: enabled

Display the configuration by entering the following:

admin@PicOS-OVS$ovs-vsctl show-cos-map ge-1/1/1
cos mapping: enabled 
{
       dscp   queue
    --------  -----
     0 -  7:   q0
     8 - 15:   q1
    16 - 23:   q2
    24 - 31:   q3
    32 - 39:   q4
    40 - 47:   q5
    48 - 55:   q6
    56 - 63:   q7
}

To configure a flow, use the following command:

admin@PicOS-OVS$ovs-ofctl add-flow br0 in_port=1,dl_src=22:11:11:11:11:11,actions=set_queue:7,output=3

The action of "set-queue:7" will take the place of the default CoS mapping.

Modify the dscp value of port:

admin@XorPlus$ovs-vsctl set-cos-map true
admin@XorPlus$
admin@XorPlus$ovs-vsctl set interface ge-1/1/1 dscp_map=0=q1,1=q1,2=q2
admin@XorPlus$ovs-vsctl show-cos-map ge-1/1/1
cos mapping: enabled 
{
dscp queue
-------- -----
0: q1
1: q1
2: q2
others: q0
}
admin@XorPlus$

The following command is also permitted:

admin@XorPlus$ovs-vsctl set interface ge-1/1/2 dscp_map:0=q1 dscp_map:1=q1 dscp_map:2=q2
admin@XorPlus$
admin@XorPlus$
admin@XorPlus$ovs-vsctl show-cos-map ge-1/1/2
cos mapping: enabled 
{
dscp queue
-------- -----
0: q1
1: q1
2: q2
others: q0
}
admin@XorPlus$

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