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

From: Jack Min <jackmin@mellanox.com>
To: Thomas Monjalon <thomas@monjalon.net>
Cc: "dev@dpdk.org" <dev@dpdk.org>, Ori Kam <orika@mellanox.com>,
	Slava Ovsiienko <viacheslavo@mellanox.com>,
	Adrien Mazarguil <adrien.mazarguil@6wind.com>,
	Ferruh Yigit <ferruh.yigit@intel.com>,
	Andrew Rybchenko <arybchenko@solarflare.com>,
	"stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] ethdev: expand RSS flows based on last item spec
Date: Tue, 5 Nov 2019 12:08:38 +0000	[thread overview]
Message-ID: <20191105120814.hx4tnoz5ytqozd6n@mellanox.com> (raw)
In-Reply-To: <4507833.CEzoxxxZIU@xps>

On Tue, 19-11-05, 11:11, Thomas Monjalon wrote:
> Hi Jack,
> 
> If it is a fix, please change your title.
> 
Ok, I will add 'fix' in 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.
> 
It seems I missed some words here. I'll update it.

> > In another word, it will add some rte_flow items if the user
> 
> What is "it"?
> 
I mean rte_flow_expande_rss.

> > specified items are not complete, for example:
> > 
> >   ... pattern eth / end actions rss type tcp end ...
> 
> Please explain why it is not complete.
> 
What I mean is user provides above instead of:

  ... pattern eth / ipv6 / tcp / end actions rss type tcp end ...

This one is 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.
> 
Sure.

> > 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.
> 
OK, I'll make it shorter.

> >   ... 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@dpdk.org
> 
> Missing empty line here to separate blocks.
> 
Ok, I'll add empty line here.

> > Signed-off-by: Xiaoyu Min <jackmin@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.
> 
>