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-------- Original Message --------
Subject: Re: [ovs-discuss] openvswitch - What is the use of NICIRA extensions
From: Ben Pfaff
To: madhu
CC: discuss@openvswitch.org
This is kind of like asking "in what scenarios may one use a variable"
in a programming language.
You can use registers to store values that later tables match.
On Fri, Sep 09, 2016 at 10:09:40PM +0530, madhu wrote:
> Hi Ben,
>
> Thanks for the reply.
>
> To be precise we are trying to implement Service Function Chaining.
>
> The flows included in the below mail are in the compute node openvswitch
> controlled by opendaylight controller.
>
> If my understanding is correct load:0x2->NXM_NX_REG0[] stores hexadecimal
> value 2 in the NXM register.
>
> What I am not able to understand is in what scenarios one may use NXM
> register to store values.
>
> Any explanation about the use of NXM registers will be helpfull.
>
> Thanks,
> Madhu Chakravarthy.
>
> On 09-09-2016 21:20, Ben Pfaff wrote:
> >On Fri, Sep 09, 2016 at 05:54:41PM +0530, madhu wrote:
> >>I am trying to understand the open flow rules written to the openvswitch.
> >>
> >>I am using openvswitch with openflow version 1.3. In that I see flow rules
> >>like below
> >>
> >>cookie=0x0, duration=133278.833s, table=0, n_packets=37283,
> >>n_bytes=15219696, tun_id=0x5a,in_port=1
> >>actions=load:0x2->NXM_NX_REG0[],goto_table:20
> >>cookie=0x0, duration=133156.937s, table=0, n_packets=47834, n_bytes=4333742,
> >>tun_id=0x65,in_port=1 actions=load:0x2->NXM_NX_REG0[],goto_table:20
> >>cookie=0x0, duration=133285.759s, table=0, n_packets=1673, n_bytes=647400,
> >>tun_id=0x61,in_port=1 actions=load:0x2->NXM_NX_REG0[],goto_table:20
> >>
> >>What is the use of load:0x2->NXM_NX_REG0[] and where to use this action.
> >ovs-ofctl(8) explains OpenFlow actions.
> >
> >It's hard to guess what this is for without context. What added the
> >actions to the flow table?
> >
>
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