netdev - Re: [PATCH rdma-next v1 11/13] IB/mlx5: Add flow counters binding support

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Date:   Tue, 29 May 2018 10:11:19 +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>,
        Boris Pismenny <borisp@...lanox.com>,
        Matan Barak <matanb@...lanox.com>,
        Raed Salem <raeds@...lanox.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH rdma-next v1 11/13] IB/mlx5: Add flow counters binding
 support

On Mon, May 28, 2018 at 11:27:52AM -0600, Jason Gunthorpe wrote:
> On Sun, May 27, 2018 at 01:23:44PM +0300, Leon Romanovsky wrote:
>
> > +	if (!mcounters->hw_cntrs_hndl) {
> > +		mcounters->hw_cntrs_hndl =
> > +			(void *)mlx5_fc_create(to_mdev(ibcounters->device)->mdev,
> > +					       false);
>
> No unnecessary casts

hw_cntrs_hndl was intended to be generic enough to be connected with
different type of counters and not only mlx5_fc. However, i don't see
any coming feature are using this generic interface, so I'll remove.

>
> > +struct mlx5_ib_flow_counters_data {
> > +	__aligned_u64   counters_data;
>
> I think this is supposed to use RDMA_UAPI_PTR() these days.

It is a little bit problematic,
1. That RDMA_UAPI_PTR is declared in ib_user_ioctl_verbs.h, while
mlx5_ib_flow_counters_data in mlx5-abi.h.
2. Other similar __aligned_u64 needs to be updated in other mlx5-abi.h structures.

Thanks

>
> Jason

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