Hi, Ben,
I am not sure if this is a bug, but I think it probably is as the bit
mask is not discontiguous,
it can not reserve enough bits for a megaflow? Or this is intended to cache
as less bits as possible? (a feature?)
At 2016-03-18 23:38:04, "Ben Pfaff" <[email protected]> wrote:
>On Fri, Mar 18, 2016 at 05:02:41PM +0800, Peng He wrote:
>> Hi, I send this email once, no people replied. I am trying to refresh this
>> email for a reply.
>> This discontiguous bit mask issue arises in the following case:
>>
>>
>> I installed two rules,
>>
>>
>> ovs-ofctl add-flow br0
>> in_port=1,dl_type=0x0800,nw_src=10.2.10.0/24,nw_proto=6,tcp_dst=0x0050,priority=1,actions=drop
>> ovs-ofctl add-flow br0
>> in_port=1,dl_type=0x0800,nw_src=10.2.0.0/16,nw_proto=6,tcp_dst=0x1f90,priority=1,actions=drop
>>
>>
>> and test the rules with packet (nw_src = 10.2.2.1 and tcp_dst = 8080). I
>> got the nw_src mask (in network byte order) 0x8ffff.
>> Even you change it to host byte order the bit mask still has discontiguous
>> 1-bits 0xFFFF08 = 1111 1111 1111 1111 0000 1000.
>
>This looks correct to me. Are you reporting a bug? If so, what is it?
>
>Here's how to reproduce this setup, under "make sandbox":
>
> ovs-vsctl add-br br0
> ovs-ofctl del-flows br0
> ovs-ofctl add-flow br0
> in_port=1,dl_type=0x0800,nw_src=10.2.10.0/24,nw_proto=6,tcp_dst=0x0050,priority=1,actions=drop
> ovs-ofctl add-flow br0
> in_port=1,dl_type=0x0800,nw_src=10.2.0.0/16,nw_proto=6,tcp_dst=0x1f90,priority=1,actions=drop
> ovs-appctl ofproto/trace br0 tcp,in_port=1,nw_src=10.2.2.1,tcp_dst=8080
>
>The output is:
>
> Bridge: br0
> Flow:
> tcp,in_port=1,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=00:00:00:00:00:00,nw_src=10.2.2.1,nw_dst=0.0.0.0,nw_tos=0,nw_ecn=0,nw_ttl=0,tp_src=0,tp_dst=8080,tcp_flags=0
>
> Rule: table=0 cookie=0
> priority=1,tcp,in_port=1,nw_src=10.2.0.0/16,tp_dst=8080
> OpenFlow actions=drop
>
> Final flow:
> tcp,in_port=1,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=00:00:00:00:00:00,nw_src=10.2.2.1,nw_dst=0.0.0.0,nw_tos=0,nw_ecn=0,nw_ttl=0,tp_src=0,tp_dst=8080,tcp_flags=0
> Megaflow:
> recirc_id=0,tcp,in_port=1,nw_src=10.2.0.0/255.255.8.0,nw_frag=no,tp_dst=8080
> Datapath actions: drop
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