> On 31 Jan 2019, at 15:26, Raj <rajlistu...@gmail.com> wrote:
>
> Hello all,
>
> Continuing my reading of VPP code, I have a query regarding packet handling.
>
> When a node gets a vector of packets to process, if I understand
> correctly, this would be a vlib_frame_t instance. From this
> vlib_frame_t instance arguments[0] is the offset to first packet,
> arguments[1] is the offset to second packet and so on, upto xx number
> of packets.
They are buffer indices, unique 4-byte identifier of the buffer.
> Is this understanding correct? if yes, how much is the
> maximum size of the packet buffer?
VLIB_FRAME_SIZE
>
> Also what is the significance of scalar_size/vector_size in
> vlib_frame_t? Does it mean the number of frames/size of frames?
typically it is not, but it may be sued to pass some additional data.
There is one example if that in repo - ethernet-input node.
VLIB_REGISTER_NODE (ethernet_input_node) = {
...
.scalar_size = sizeof (ethernet_input_frame_t),
...
};
>
> in vlib/main.c there is a statement vec_resize (nm->pending_frames,
> 32). In here, what is pending_frames and what is the significance of
> number 32?
I guess arbitrary chosen number, educated guess....
>
> I know I have been asking too many questions over here and very
> grateful to all who answer.
np
--
Damjan
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