> -----Original Message----- > From: Zhang, Helin > Sent: Tuesday, October 28, 2014 8:01 PM > To: Thomas Monjalon > Cc: dev at dpdk.org > Subject: RE: [dpdk-dev] [PATCH v2 04/13] ethdev: support of multiple sizes of > redirection table > > Hi Thomas > > > -----Original Message----- > > From: Thomas Monjalon [mailto:thomas.monjalon at 6wind.com] > > Sent: Tuesday, October 28, 2014 6:10 PM > > To: Zhang, Helin > > Cc: dev at dpdk.org > > Subject: Re: [dpdk-dev] [PATCH v2 04/13] ethdev: support of multiple > > sizes of redirection table > > > > 2014-10-28 00:33, Zhang, Helin: > > > From: Thomas Monjalon [mailto:thomas.monjalon at 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. > > > > OK, so you should explain that only these values are allowed. > > In general, it's something we explain in the comment of the function > It would be better to add comments for the functions. Now do not think explain what value is allowed for the functions in ethdev layer, as it might be hardware specific. I think the best way is to comment out end users can get the reta size by 'dev_infos_get' on each port, rather than telling the values directly.
> > > > > By the way, why only these values are allowed? > It depends on hardware, 1G/10G hardware supports 128 reta size only, 40G > hardware supports 512 or 128 depends on hardware configuration, 40G VF > hardware supports 64. If more is introduced in the future, more values can be > added later. It will return with errors if reta size is not supported for > specific > hardware. > > > > > -- > > Thomas > > Regards, > Helin Regards, Helin
