[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
it says
"Matches a byte string of a given length at a given offset."

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


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

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

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