Re: [dpdk-dev] [PATCH v3 2/2] app/testpmd: only config supported RSS hash types

["Xueming(Steven) Li" <xuemingl@mellanox.com>]

> -----Original Message-----
> From: Adrien Mazarguil <adrien.mazarguil@6wind.com>
> Sent: Wednesday, April 18, 2018 9:26 PM
> To: Xueming(Steven) Li <xuemingl@mellanox.com>
> Cc: Shahaf Shuler <shahafs@mellanox.com>; Nelio Laranjeiro <notifications@github.com>; Wenzhuo Lu
> <wenzhuo.lu@intel.com>; Jingjing Wu <jingjing.wu@intel.com>; Thomas Monjalon <thomas@monjalon.net>;
> dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v3 2/2] app/testpmd: only config supported RSS hash types
> 
> Hi Xueming,
> 
> On Wed, Apr 18, 2018 at 07:06:48PM +0800, Xueming Li wrote:
> > "port config all rss all" command will fail on PMD that not support
> > any of hard coding RSS hash types. This patch changed hard coding hash
> > types to supported types retrieved from device info.
> >
> > Signed-off-by: Xueming Li <xuemingl@mellanox.com>
> 
> Problem is that this patch removes the ability to request "all" RSS types regardless of PMD support.
> 
> Users will expect "all" to behave as documented, however doing so will only result in the limited set
> of types reported by PMDs. For instance at least
> mlx4 doesn't update the flow_type_rss_offloads field since it has never implemented configuration
> support for the legacy RSS API.
> 
> You should add an argument with a different name (e.g. "supported" or
> "default") for that and keep the original meaning for "all".
> 
> Testpmd documentation has to be updated accordingly.

You must want to have a look at first part of this patchset:
http://www.dpdk.org/ml/archives/dev/2018-April/097849.html

> 
> One more nit below.
> 
> > ---
> >  app/test-pmd/cmdline.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c index
> > 512e3b55e..d357de7e6 100644
> > --- a/app/test-pmd/cmdline.c
> > +++ b/app/test-pmd/cmdline.c
> > @@ -1998,6 +1998,7 @@ cmd_config_rss_parsed(void *parsed_result,  {
> >  	struct cmd_config_rss *res = parsed_result;
> >  	struct rte_eth_rss_conf rss_conf = { .rss_key_len = 0, };
> > +	struct rte_eth_dev_info dev_info = {0};
> 
> This could be declared in the new block where it's used. Also note that "{0}" is nonstandard syntax,
> use memset() or initialize a field like rss_key_len above.
> 
> >  	int diag;
> >  	uint8_t i;
> >
> > @@ -2034,6 +2035,12 @@ cmd_config_rss_parsed(void *parsed_result,
> >  	}
> >  	rss_conf.rss_key = NULL;
> >  	for (i = 0; i < rte_eth_dev_count(); i++) {
> > +		if (!strcmp(res->value, "all")) {
> > +			rte_eth_dev_info_get(i, &dev_info);
> > +			if (dev_info.flow_type_rss_offloads)
> > +				rss_conf.rss_hf =
> > +					dev_info.flow_type_rss_offloads;
> > +		}
> >  		diag = rte_eth_dev_rss_hash_update(i, &rss_conf);
> >  		if (diag < 0)
> >  			printf("Configuration of RSS hash at ethernet port %d "
> > --
> > 2.13.3
> >
> 
> 
> --
> Adrien Mazarguil
> 6WIND