netdev - Re: [PATCH net-next v2 4/7] ice: Implement iidc operations

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Date:   Fri, 28 May 2021 16:48:17 +0000
From:   "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>
To:     "jgg@...dia.com" <jgg@...dia.com>,
        "kuba@...nel.org" <kuba@...nel.org>
CC:     "Ertman, David M" <david.m.ertman@...el.com>,
        "leonro@...dia.com" <leonro@...dia.com>,
        "Saleem, Shiraz" <shiraz.saleem@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "dledford@...hat.com" <dledford@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 4/7] ice: Implement iidc operations

On Fri, 2021-05-28 at 10:02 -0300, Jason Gunthorpe wrote:
> On Thu, May 27, 2021 at 05:12:41PM -0700, Jakub Kicinski wrote:
> > On Thu, 27 May 2021 10:30:11 -0700 Tony Nguyen wrote:
> > > +static enum ice_status
> > > +ice_aq_add_rdma_qsets(struct ice_hw *hw, u8 num_qset_grps,
> > > +		      struct ice_aqc_add_rdma_qset_data *qset_list,
> > > +		      u16 buf_size, struct ice_sq_cd *cd)
> > > +{
> > > +	struct ice_aqc_add_rdma_qset_data *list;
> > > +	struct ice_aqc_add_rdma_qset *cmd;
> > > +	struct ice_aq_desc desc;
> > > +	u16 i, sum_size = 0;
> > > +
> > > +	cmd = &desc.params.add_rdma_qset;
> > > +
> > > +	ice_fill_dflt_direct_cmd_desc(&desc,
> > > ice_aqc_opc_add_rdma_qset);
> > > +
> > > +	if (!qset_list)
> > 
> > defensive programming

Will remove this.

> > 
> > > +		return ICE_ERR_PARAM;
> > 
> > RDMA folks, are you okay with drivers inventing their own error
> > codes?
> 
> Not really, I was ignoring it because it looks like big part of their
> netdev driver layer.

We have looked into how we can eliminate/minimize the use of ice_status
and our assessment is that this will take a decent amount of work. We
are trying to get this done.

Thanks,
Tony

> > Having had to make tree-wide changes and deal with this cruft in 
> > the past I've developed a strong dislike for it. But if you're okay
> > I guess it can stay, these are RDMA functions after all.
> 
> I don't think it is a "RDMA" issue:
> 
> $ git grep ICE_ERR_PARAM | wc -l
> 168
> $ git grep -l ICE_ERR_PARAM
> drivers/net/ethernet/intel/ice/ice_common.c
> drivers/net/ethernet/intel/ice/ice_controlq.c
> drivers/net/ethernet/intel/ice/ice_dcb.c
> drivers/net/ethernet/intel/ice/ice_fdir.c
> drivers/net/ethernet/intel/ice/ice_flex_pipe.c
> drivers/net/ethernet/intel/ice/ice_flow.c
> drivers/net/ethernet/intel/ice/ice_lib.c
> drivers/net/ethernet/intel/ice/ice_main.c
> drivers/net/ethernet/intel/ice/ice_nvm.c
> drivers/net/ethernet/intel/ice/ice_sched.c
> drivers/net/ethernet/intel/ice/ice_sriov.c
> drivers/net/ethernet/intel/ice/ice_status.h
> drivers/net/ethernet/intel/ice/ice_switch.c
> drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
> 
> Jason