[dpdk-users] Flow director struct rte_flow_item_raw guild
張敬昊
frank at csie.io
Thu May 9 04:10:32 CEST 2019
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 at 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 at csie.io
https://frankchang.me
*High Speed Network Lab <http://speed.cis.nctu.edu.tw/>*
*National Chiao Tung University*
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