> -----Original Message-----
> From: Ferruh Yigit <ferruh.yi...@intel.com>
> Sent: Tuesday, September 1, 2020 7:08 PM
> To: Kiran Kumar Kokkilagadda <kirankum...@marvell.com>; Thomas Monjalon
> <tho...@monjalon.net>; Andrew Rybchenko <arybche...@solarflare.com>
> Cc: dev@dpdk.org; Jerin Jacob Kollanukkaran <jer...@marvell.com>;
> or...@mellanox.com; xuanziya...@huawei.com;
> cloud.wangxiao...@huawei.com; zhouguoy...@huawei.com;
> rosen...@intel.com; beilei.x...@intel.com; jia....@intel.com; Rasesh Mody
> <rm...@marvell.com>; Shahed Shaikh <shsha...@marvell.com>; Nithin Kumar
> Dabilpuram <ndabilpu...@marvell.com>; qiming.y...@intel.com;
> qi.z.zh...@intel.com; keith.wi...@intel.com; hemant.agra...@nxp.com;
> sachin.sax...@nxp.com; wei.zh...@intel.com; johnd...@cisco.com;
> hyon...@cisco.com; ch...@att.com; ma...@mellanox.com;
> shah...@mellanox.com; viachesl...@mellanox.com;
> rahul.lakkire...@chelsio.com; gr...@u256.net; Liron Himi
> <lir...@marvell.com>; jingjing...@intel.com; xavier.hu...@huawei.com;
> humi...@huawei.com; yisen.zhu...@huawei.com;
> ajit.khapa...@broadcom.com; somnath.ko...@broadcom.com;
> jasvinder.si...@intel.com; cristian.dumitre...@intel.com
> Subject: [EXT] Re: [dpdk-dev][PATCH v7 1/3] ethdev: add level support for RSS
> offload types
>
> External Email
>
> ----------------------------------------------------------------------
> On 9/1/2020 4:27 AM, kirankum...@marvell.com wrote:
> > From: Kiran Kumar K <kirankum...@marvell.com>
> >
> > This patch reserves 2 bits as input selection to select Inner and
> > outer encapsulation level for RSS computation. It is combined with
> > existing
> > ETH_RSS_* to choose Inner or outer layers.
> > This functionality already exists in rte_flow through level parameter
> > in RSS action configuration rte_flow_action_rss.
> >
> > Signed-off-by: Kiran Kumar K <kirankum...@marvell.com>
> > ---
> > V7 Changes:
> > * Re-worked to keep it in sync with rte_flow_action_rss and support
> > upto
> > 3 levels.
> > * Addressed testpmd review comments.
> >
> > lib/librte_ethdev/rte_ethdev.h | 27 +++++++++++++++++++++++++++
> > 1 file changed, 27 insertions(+)
> >
> > diff --git a/lib/librte_ethdev/rte_ethdev.h
> > b/lib/librte_ethdev/rte_ethdev.h index 70295d7ab..13e49bbd7 100644
> > --- a/lib/librte_ethdev/rte_ethdev.h
> > +++ b/lib/librte_ethdev/rte_ethdev.h
> > @@ -552,6 +552,33 @@ struct rte_eth_rss_conf {
> > #define RTE_ETH_RSS_L3_PRE64 (1ULL << 53)
> > #define RTE_ETH_RSS_L3_PRE96 (1ULL << 52)
> >
> > +/*
> > + * We use the following macros to combine with the above layers to
> > +choose
> > + * inner and outer layers or both for RSS computation.
> > + * bit 50 and 51 are reserved for this.
> > + */
> > +
> > +/** level 0, requests the default behavior. Depending on the packet
> > + * type, it can mean outermost, innermost, anything in between or even no
> RSS.
> > + * It basically stands for the innermost encapsulation level RSS
> > + * can be performed on according to PMD and device capabilities.
> > + */
> > +#define ETH_RSS_LEVEL_0 (0ULL << 50)
>
> I can see from history how this is involved, but the 'ETH_RSS_LEVEL_0' naming
> is
> not really clear what it is, the naming in v6 is more clear.
>
> What about following one:
> 0 -> LEVEL_PMD_DEFAULT
> 1 -> LEVEL_OUTER
> 2 -> LEVEL_INNER
> 3 -> LEVEL_INNER_OUTER
>
> This doesn't exactly match to rte_flow one, but closer than v6 one. This ends
> with max level 2. And defines a way to say both inner and outer.
This one looks good to me. If everyone is ok with the proposed changes, I will
send V8.
>
> > +
> > +/** level 1, requests RSS to be performed on the outermost packet
> > + * encapsulation level.
> > + */
> > +#define ETH_RSS_LEVEL_1 (1ULL << 50)
> > +
> > +/** level 2, requests RSS to be performed on the
> > + * specified inner packet encapsulation level, from outermost to
> > + * innermost (lower to higher values).
> > + */
> > +#define ETH_RSS_LEVEL_2 (2ULL << 50)
>
> I can see you are trying to copy rte_flow usage, but this doesn't really makes
> sense here. Where the value of the level is defined in this case? If not
> defined
> how the PMD knows which level to use?
>
> > +#define ETH_RSS_LEVEL_MASK (3ULL << 50)
> > +
> > +#define ETH_RSS_LEVEL(rss_hf) ((rss_hf & ETH_RSS_LEVEL_MASK) >> 50)
> > +
> > /**
> > * For input set change of hash filter, if SRC_ONLY and DST_ONLY of
> > * the same level are used simultaneously, it is the same case as
> > --
> > 2.25.1
> >
