netdev - Re: [PATCH rdma-next v1 12/15] RDMA/mlx5: Add a new flow action verb

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Message-ID: <20180905052044.GE2977@mtr-leonro.mtl.com>
Date:   Wed, 5 Sep 2018 08:20:44 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Doug Ledford <dledford@...hat.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Ariel Levkovich <lariel@...lanox.com>,
        Mark Bloch <markb@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH rdma-next v1 12/15] RDMA/mlx5: Add a new flow action verb
 - modify header

On Tue, Sep 04, 2018 at 03:58:23PM -0600, Jason Gunthorpe wrote:
> On Tue, Aug 28, 2018 at 02:18:51PM +0300, Leon Romanovsky wrote:
>
> > +static int UVERBS_HANDLER(MLX5_IB_METHOD_FLOW_ACTION_CREATE_MODIFY_HEADER)(
> > +	struct ib_uverbs_file *file,
> > +	struct uverbs_attr_bundle *attrs)
> > +{
> > +	struct ib_uobject *uobj = uverbs_attr_get_uobject(
> > +		attrs, MLX5_IB_ATTR_CREATE_MODIFY_HEADER_HANDLE);
> > +	struct mlx5_ib_dev *mdev = to_mdev(uobj->context->device);
> > +	enum mlx5_ib_uapi_flow_table_type ft_type;
> > +	struct ib_flow_action *action;
> > +	size_t num_actions;
> > +	void *in;
> > +	int len;
> > +	int ret;
> > +
> > +	if (!mlx5_ib_modify_header_supported(mdev))
> > +		return -EOPNOTSUPP;
> > +
> > +	in = uverbs_attr_get_alloced_ptr(attrs,
> > +		MLX5_IB_ATTR_CREATE_MODIFY_HEADER_ACTIONS_PRM);
> > +	len = uverbs_attr_get_len(attrs,
> > +		MLX5_IB_ATTR_CREATE_MODIFY_HEADER_ACTIONS_PRM);
> > +
> > +	if (len % MLX5_UN_SZ_BYTES(set_action_in_add_action_in_auto))
> > +		return -EINVAL;
> > +
> > +	ret = uverbs_get_const(&ft_type, attrs,
> > +			       MLX5_IB_ATTR_CREATE_MODIFY_HEADER_FT_TYPE);
> > +	if (ret)
> > +		return -EINVAL;
>
> This should be
>
> 	if (ret)
> 		return ret;
>
> Every call to uverbs_get_const is wrong in this same way..

Right, from technical point of view uverbs_get_const can return EINVAL
only, and it is correct for now, but need to be changed to proper
"return ret".

>
> I can probably fix it if this is the only thing though..
>

Thanks, I appreciate it.

> Jason

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