Re: [dpdk-dev] [PATCH v2 04/13] ethdev: support of multiple sizes of redirection table

["Zhang, Helin" <helin.zhang@intel.com>]

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> Sent: Tuesday, October 28, 2014 10:23 PM
> To: Zhang, Helin
> Cc: Richardson, Bruce; dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v2 04/13] ethdev: support of multiple sizes of
> redirection table
> 
> 2014-10-28 13:20, Zhang, Helin:
> > From: Richardson, Bruce
> > > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Thomas Monjalon
> > > > 2014-10-28 00:33, Zhang, Helin:
> > > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > > > 2014-09-25 16:40, Helin Zhang:
> > > > > > >  /* Definitions used for redirection table entry size */
> > > > > > > -#define ETH_RSS_RETA_NUM_ENTRIES 128
> > > > > > > -#define ETH_RSS_RETA_MAX_QUEUE   16
> > > > > > > +#define ETH_RSS_RETA_SIZE_64  64 #define
> > > > > > > +ETH_RSS_RETA_SIZE_128 128 #define ETH_RSS_RETA_SIZE_512 512
> > > > > > > +
> > > > > > > +#define RTE_BIT_WIDTH_64 (CHAR_BIT * sizeof(uint64_t))
> > > > > >
> > > > > > Are these constants really needed?
> > > > >
> > > > > These constants were defined for the third input parameter of
> > > > > rte_eth_dev_rss_reta_update() and rte_eth_dev_rss_reta_query().
> > > > > End users need to give the correct reta size listed as above, as
> > > > > other values is not valid. So it would be better to list the
> > > > > valid reta sizes in macros here.
> > > >
> > > If only limited range of values are allowed, would an enum work
> > > better than a set of macros?
> >
> > Good idea! Any other comments for this from other guys?
> 
> I would prefer the API to be independent of the hardware capabilities.
Let keep it as it is, and add more possible comments somewhere.

> 
> --
> Thomas

Regards,
Helin