Re: [dpdk-users] Flow director struct rte_flow_item_raw guild

[張敬昊 <frank@csie.io>]

Hi 懷恩,

On the second line of the detailed description of the struct reference
<https://doc.dpdk.org/api/structrte__flow__item__raw.html#a0ea66fcaa4ad84410cef13b693809bd2>,
it says
"Matches a byte string of a given length at a given offset."

I think *pattern* is the byte string to look for.

Regards,
Frank

On Thu, May 9, 2019 at 10:01 AM 曾懷恩 <the@csie.io> wrote:

>
> Hi,
>
> I have a few questions about structure rte_flow_item_raw.
>
> In DPDK API doc, it shows there are some below elements in this structure
>
> uint32_t        relative:1
> uint32_t        search:1
> uint32_t        reserved:30
> int32_t         offset
> uint16_t        limit
> uint16_t        length
> const uint8_t *         pattern
>
>  Now I can understand the relative and search elements are used to
> determine search type.
>
> The offset element is used to set the start search point in packet.
>
> The limit element is used to set the end search point in packet.
>
> However, I can’t understand what the pattern element is used to?
>
> What kind of pointer should I assign to the pattern element?
>
> Besides, in other rte_flow_item_* structures, there are clearly elements
> to let user to set contents and masks.
>
> How do I do in the structure rte_flow_item_raw?
>
> Thanks a lot,
>
> Best Regards,
>
>

-- 
張敬昊 Frank Chang
Email: frank@csie.io
https://frankchang.me

*High Speed Network Lab <http://speed.cis.nctu.edu.tw/>*
*National Chiao Tung University*