Ben Pfaff, Hi:
i have to make it clear that QoS here refers to bandwidth limitation(TC),
rather than dscp or tos. what i want to do is to limit the bandwidth of vif
and ovn's router port.
allocate_chassis_queueid and dpif_queue_to_priority tell that queue_id is
a incremental number . in kernel function execute_masked_set_action just assign
the value of queue_id to skb->priority , then sent it to one queue.
no code tell the connection between priority and tc's class id. ovn
only support htb , and all qos rules are set to physical ethernet(for example
eth0), how vif's packets are sent to eth0's tc class?
take a look at my environment:
#ovs-dpctl dump-flows
recirc_id(0),skb_priority(0),in_port(3),eth(src=02:ac:10:ff:00:11,dst=02:ac:10:ff:00:22),eth_type(0x0800),ipv4(tos=0/0x3,frag=no),actions:set(tunnel(tun_id=0x1,dst=101.158.40.159,ttl=64,tp_dst=6081,geneve({class=0x102,type=0x80,len=4,0x10002}),flags(df|csum|key))),set(skb_priority(0x10002)),2
# tc qdisc show dev eth0
qdisc htb 1: root refcnt 2 r2q 10 default 1 direct_packets_stat 17490
# tc class show dev eth0
class htb 1:fffe root rate 100000Kbit ceil 100000Kbit burst 1500b cburst 1500b
class htb 1:2 parent 1:fffe prio 0 rate 12000bit ceil 25000bit burst 2499b
cburst 2500b
my question is:
1. does the flow 'set(skb_priority(0x10002))' have something to do with class
htb 1:2 ? and how?
source code is preferable
thanks very much.
At 2017-02-08 00:39:36, "Ben Pfaff" <[email protected]> wrote:
>On Tue, Feb 07, 2017 at 09:21:05PM +0800, lg.yue wrote:
>> i want to understand how QoS is implemented in ovs.
>> according to my understanding, lflow 'actions=set_queue:1' is
>> translated into a ofpbuf(type=OFPAT_RAW_QUEUE, queue_id=1).
>> but in funxtion do_xlate_actions，when type is OFPACT_SET_QUEUE,
>> queue_id is translated into skb_priority, why?
>>
>> whether or not i miss something? please correct me and tell the
>> complete process-flow.
>
>OVS depends on the datapath (usually, the Linux kernel) to actually
>implement QoS. It uses the skb_priority field to tell the datapath the
>output queue, translating the queue number into a datapath-specific
>priority.
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