Thank you Dave - this is very helpful
Please see comments inline
> -----Original Message-----
> From: vpp-dev@lists.fd.io [mailto:vpp-dev@lists.fd.io] On Behalf Of Dave
> Barach
> Sent: Wednesday, 07 March, 2018 3:20 PM
> To: vpp-dev@lists.fd.io
> Subject: Re: [vpp-dev] VPP - mechanism to drop packets
>
> Add an arc from your node to the "error-drop" node, set next0 =
> MYNODE_NEXT_ERROR and b0->error = node->errors[SOME_ERROR].
>
[Avi Cohen (A)]
I'm using the standard loop - this is with the next0 and next1 - this mean that
we are processing 2 pkts within a single stage of the loop - correct ?
In this case if I want to drop both pkts I have to set the next1 to
NEXT_ERROR as well correct ?
> Please use the standard dual/single - or quad/single - loop code pattern to
> walk
> the incoming vector of buffer indices. You will hate your life if you try to
> code
> the vector-walk from first principles. It's not impossible, but I it will be
> a waste
> of your time / a bunch of needless aggravation.
>
> b0->sw_if_index[VLIB_TX] is interpreted in a couple of different ways. "ip4/6-
> lookup" interprets it as a fib index. "interface-output" interprets it as a
> [tx]
> hardware interface ID.
>
> I'm not sure what you're trying to do, but if it involves an ip lookup, do
> NOT set
> b0->sw_if_index[VLIB_TX]. Let the fib code do its job, and send pkts to either
> the input nodes - if mandatory input checks / ttl decrement have not been
> performed - or to the lookup stage if e.g. you've rewritten the ip header(s)
> in
> some fashion.
[Avi Cohen (A)]
I'm implementing my fwding function and I want to bypass the IP-lookup
And maybe do some rewrite and then to interface-output
Best Regards
Avi
>
> HTH... Dave
>
> -----Original Message-----
> From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Avi Cohen (A)
> Sent: Wednesday, March 7, 2018 6:38 AM
> To: vpp-dev@lists.fd.io
> Subject: [vpp-dev] VPP - mechanism to drop packets
>
> Hi,
> I'm implementing a simple policy plugin , below is the pseudo-code
>
> Go over the packets vector
> While (there are packets to process )
> {
> Check if a packet match a specific rule
> If yes - set the out-interface for the packet to be transmitted
> Else - drop packet
> }
>
> 2 Question -
> 1. is there any function/mechanism that implements a drop ? or any filed in
> the packet's metadata for drop marking ?
> 2. Regarding the set tx out interface - I see that I can set the
> sw_if_index[VLIB_TX] - so the packet will be later transmitted through this
> interface - is this correct ?
>
> Best Regards
> Avi
>
>
>
>
>
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