Re: [dpdk-dev] Please revert: [PATCH 2/2] net/mlx4: fix useless default in RSS converter

[Adrien Mazarguil <adrien.mazarguil@6wind.com>]

On Wed, May 09, 2018 at 09:57:31AM +0000, Shahaf Shuler wrote:
> Wednesday, May 9, 2018 11:47 AM, Ophir Munk:
> > Subject: Please revert: [dpdk-dev] [PATCH 2/2] net/mlx4: fix useless default
> > in RSS converter
> > 
> > Hi Shahaf, Adrien,
> > 
> > This commit (in next-net/master since 8-May-18) is breaking all testpmd calls
> > with mlx4 NIC, see [1].
> > Can you please revert it?
> 
> What is the root cause? Why is failsafe failing due to it?  

Root cause is the omission of a single line change in the original patch
(although successfully validated locally, dumb mistake). I'll send an
updated patch.

> > [1]
> > PMD: net_mlx4: cannot set up internal flow rules (code 95, "Operation not
> > supported"), flow error type 16, cause 0x7fffdb5bb3a0, message:
> > unsupported RSS hash type requested Fail to configure port 0
> > EAL: Error - exiting with code: 1
> >   Cause: Start ports failed
> > 
> > > -----Original Message-----
> > > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Adrien Mazarguil
> > > Sent: Friday, May 04, 2018 6:18 PM
> > > To: Shahaf Shuler <shahafs@mellanox.com>
> > > Cc: Ferruh Yigit <ferruh.yigit@intel.com>; dev@dpdk.org;
> > > stable@dpdk.org
> > > Subject: [dpdk-dev] [PATCH 2/2] net/mlx4: fix useless default in RSS
> > > converter
> > >
> > > Since the commit below, mlx4_conv_rss_types() does not need to support
> > > special value -1 anymore. Other functions rely on priv->hw_rss_sup
> > directly.
> > >
> > > Fixes: 1d173da83ef2 ("net/mlx4: fix default RSS hash fields")
> > > Cc: stable@dpdk.org
> > >
> > > Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
> > > ---
> > >  drivers/net/mlx4/mlx4_flow.c | 5 -----
> > >  1 file changed, 5 deletions(-)
> > >
> > > diff --git a/drivers/net/mlx4/mlx4_flow.c
> > > b/drivers/net/mlx4/mlx4_flow.c index 3f754b480..cb3b9a952 100644
> > > --- a/drivers/net/mlx4/mlx4_flow.c
> > > +++ b/drivers/net/mlx4/mlx4_flow.c
> > > @@ -78,9 +78,6 @@ struct mlx4_drop {
> > >  /**
> > >   * Convert DPDK RSS hash types to their Verbs equivalent.
> > >   *
> > > - * This function returns the supported (default) set when @p types
> > > has
> > > - * special value (uint64_t)-1.
> > > - *
> > >   * @param priv
> > >   *   Pointer to private structure.
> > >   * @param types
> > > @@ -125,8 +122,6 @@ mlx4_conv_rss_types(struct priv *priv, uint64_t
> > > types)
> > >  	uint64_t conv = 0;
> > >  	unsigned int i;
> > >
> > > -	if (types == (uint64_t)-1)
> > > -		return priv->hw_rss_sup;
> > >  	for (i = 0; i != RTE_DIM(in); ++i)
> > >  		if (types & in[i]) {
> > >  			seen |= types & in[i];
> > > --
> > > 2.11.0

-- 
Adrien Mazarguil
6WIND