netdev - Re: [PATCH mlx5-next 2/2] net/mlx5: Factor out HCA capabilities functions

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Date:   Mon, 11 Feb 2019 22:02:07 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     Doug Ledford <dledford@...hat.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Moni Shoua <monis@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH mlx5-next 2/2] net/mlx5: Factor out HCA capabilities
 functions

On Mon, Feb 11, 2019 at 07:50:55PM +0000, Jason Gunthorpe wrote:
> On Mon, Feb 11, 2019 at 01:56:08PM +0200, Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro@...lanox.com>
> >
> > Combine all HCA capabilities setters under one function
> > and compile out the ODP related function in case kernel
> > was compiled without ODP support.
> >
> > Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
> >  .../net/ethernet/mellanox/mlx5/core/main.c    | 47 +++++++++++++------
> >  1 file changed, 33 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
> > index 6d45518edbdc..d7145ab6105d 100644
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
> > @@ -459,6 +459,7 @@ static int handle_hca_cap_atomic(struct mlx5_core_dev *dev)
> >  	return err;
> >  }
> >
> > +#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
> >  static int handle_hca_cap_odp(struct mlx5_core_dev *dev)
> >  {
> >  	void *set_hca_cap;
> > @@ -502,6 +503,7 @@ static int handle_hca_cap_odp(struct mlx5_core_dev *dev)
> >  	kfree(set_ctx);
> >  	return err;
> >  }
> > +#endif
> >
> >  static int handle_hca_cap(struct mlx5_core_dev *dev)
> >  {
> > @@ -576,6 +578,35 @@ static int handle_hca_cap(struct mlx5_core_dev *dev)
> >  	return err;
> >  }
> >
> > +static int set_hca_cap(struct mlx5_core_dev *dev)
> > +{
> > +	struct pci_dev *pdev = dev->pdev;
> > +	int err;
> > +
> > +	err = handle_hca_cap(dev);
> > +	if (err) {
> > +		dev_err(&pdev->dev, "handle_hca_cap failed\n");
> > +		goto out;
> > +	}
> > +
> > +	err = handle_hca_cap_atomic(dev);
> > +	if (err) {
> > +		dev_err(&pdev->dev, "handle_hca_cap_atomic failed\n");
> > +		goto out;
> > +	}
> > +
> > +#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
> > +	err = handle_hca_cap_odp(dev);
> > +	if (err) {
> > +		dev_err(&pdev->dev, "handle_hca_cap_odp failed\n");
> > +		goto out;
> > +	}
> > +#endif
>
> Adding
>   if (IS_ENABLED..)
>     return 0;
>
> To the top of handle_hca_cap_odp is alot better.

Saeed gave comment that he prefers code to be compiled-out in case
config is not set. In you suggestion, the code will exist and only
with some optimizations enabled it will be thrown.

Thanks

>
> Jason

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