[dpdk-stable] [dpdk-dev] [PATCH] ethdev: expand RSS flows based on last item spec

[Thomas Monjalon]

Hi Jack,

If it is a fix, please change your title.

05/11/2019 10:16, Xiaoyu Min:
> When rte_flow_expand_rss expands rte_flow item list based on the RSS
> types.

There is no verb in this sentence.

> In another word, it will add some rte_flow items if the user

What is "it"?

> specified items are not complete, for example:
> 
>   ... pattern eth / end actions rss type tcp end ...

Please explain why it is not complete.

> 
> above flow will be expaned to:
> 
>   ... pattern eth / end actions rss types tcp
>   ... pattern eth / ipv4 / tcp / end actions rss types tcp ...
>   ... pattern eth / ipv6 / tcp / end actsion rss types tcp ...

There are several typos in this text. Please check.

> However the expansion is just simply expanding items without
> checking last items' spec, means the expanded rules could have conflicting
> settings which is not reasonable and leads to some HW error, for
> example:

This wording is really not clear.
Please make short sentences.

>   ... pattern eth type is 0x86DD / end actions rss types tcp ...
> 
> is expaneded to:
> 
>   ... pattern eth type is 0x86DD / ipv4 / tcp end ...
> 
> which has conflicting values: 0x86DD vs. ipv4 and HW will refuse create
> flow on some NICs.
> 
> This patch will fix above by checking the last item's spec and try to
> complete the item list.
> 
> Currently only support to complete item list based on L2/L3 layer.
> 
> Fixes: 4ed05fcd441b ("ethdev: add flow API to expand RSS flows")
> Cc: stable at dpdk.org

Missing empty line here to separate blocks.

> Signed-off-by: Xiaoyu Min <jackmin at mellanox.com>
> ---
>  lib/librte_ethdev/rte_flow.c | 132 +++++++++++++++++++++++++++++++++--
>  1 file changed, 127 insertions(+), 5 deletions(-)

It's a big change. It needs to be carefully reviewed.