netdev - Re: [PATCH rdma-next v2 06/17] RDMA/counter: Add "auto" configuration mode support

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Date:   Wed, 22 May 2019 14:15:29 -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 06/17] RDMA/counter: Add "auto"
 configuration mode support

On Mon, Apr 29, 2019 at 11:34:42AM +0300, Leon Romanovsky wrote:

> +/**
> + * rdma_counter_unbind_qp - Unbind a qp from a counter
> + * @force:
> + *   true - Decrease the counter ref-count anyway (e.g., qp destroy)
> + */
> +int rdma_counter_unbind_qp(struct ib_qp *qp, bool force)
> +{
> +	struct rdma_counter *counter = qp->counter;
> +	int ret;
> +
> +	if (!counter)
> +		return -EINVAL;
> +
> +	ret = __rdma_counter_unbind_qp(qp, force);
> +	if (ret && !force)
> +		return ret;
> +
> +	rdma_restrack_put(&counter->res);
> +	if (atomic_dec_and_test(&counter->usecnt))
> +		rdma_counter_dealloc(counter);

An atomic that does kfree when it reaches zero should be implemented
with a kref.

Jason