netdev - Re: [PATCH rdma-next v2 11/17] RDMA/netlink: Implement counter dumpit calback

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Date:   Wed, 22 May 2019 14:21:37 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Majd Dibbiny <majd@...lanox.com>,
        Mark Zhang <markz@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH rdma-next v2 11/17] RDMA/netlink: Implement counter
 dumpit calback

On Mon, Apr 29, 2019 at 11:34:47AM +0300, Leon Romanovsky wrote:
> From: Mark Zhang <markz@...lanox.com>
> 
> This patch adds the ability to return all available counters
> together with their properties and hwstats.
> 
> Signed-off-by: Mark Zhang <markz@...lanox.com>
> Reviewed-by: Majd Dibbiny <majd@...lanox.com>
> Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
>  drivers/infiniband/core/counters.c |  28 +++++
>  drivers/infiniband/core/device.c   |   2 +
>  drivers/infiniband/core/nldev.c    | 173 +++++++++++++++++++++++++++++
>  include/rdma/ib_verbs.h            |  10 ++
>  include/rdma/rdma_counter.h        |   3 +
>  include/uapi/rdma/rdma_netlink.h   |  10 +-
>  6 files changed, 225 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/core/counters.c b/drivers/infiniband/core/counters.c
> index 665e0d43c21b..36cd9eca1e46 100644
> +++ b/drivers/infiniband/core/counters.c
> @@ -62,6 +62,9 @@ static struct rdma_counter *rdma_counter_alloc(struct ib_device *dev, u8 port,
>  {
>  	struct rdma_counter *counter;
>  
> +	if (!dev->ops.counter_alloc_stats)
> +		return NULL;
> +

Seems weird to add this now, why was it Ok to have counters prior to
this patch?

Jason