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From: Jason Gunthorpe <jgg@mellanox.com>
To: Leon Romanovsky <leon@kernel.org>
Cc: Doug Ledford <dledford@redhat.com>,
	Leon Romanovsky <leonro@mellanox.com>,
	RDMA mailing list <linux-rdma@vger.kernel.org>,
	Majd Dibbiny <majd@mellanox.com>, Mark Zhang <markz@mellanox.com>,
	Saeed Mahameed <saeedm@mellanox.com>,
	linux-netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH rdma-next v4 06/17] RDMA/counter: Add "auto" configuration mode support
Date: Sun, 30 Jun 2019 00:32:08 +0000
Message-ID: <20190630003200.GA7173@mellanox.com> (raw)
In-Reply-To: <20190618172625.13432-7-leon@kernel.org>

On Tue, Jun 18, 2019 at 08:26:14PM +0300, Leon Romanovsky wrote:

> +/**
> + * rdma_counter_bind_qp_auto - Check and bind the QP to a counter base on
> + *   the auto-mode rule
> + */
> +int rdma_counter_bind_qp_auto(struct ib_qp *qp, u8 port)
> +{
> +	struct rdma_port_counter *port_counter;
> +	struct ib_device *dev = qp->device;
> +	struct rdma_counter *counter;
> +	int ret;
> +
> +	if (!rdma_is_port_valid(dev, port))
> +		return -EINVAL;
> +
> +	port_counter = &dev->port_data[port].port_counter;
> +	if (port_counter->mode.mode != RDMA_COUNTER_MODE_AUTO)
> +		return 0;
> +
> +	counter = rdma_get_counter_auto_mode(qp, port);
> +	if (counter) {
> +		ret = __rdma_counter_bind_qp(counter, qp);
> +		if (ret) {
> +			rdma_restrack_put(&counter->res);
> +			return ret;
> +		}
> +		kref_get(&counter->kref);

The counter is left in the xarray while the kref is zero, this
kref_get is wrong..

Using two kref like things at the same time is a bad idea, the
'rdma_get_counter_auto_mode' should return the kref held, not the
restrack get. The restrack_del doesn't happen as long as the kref is
positive, so we don't need the retrack thing here..

> +	} else {
> +		counter = rdma_counter_alloc(dev, port, RDMA_COUNTER_MODE_AUTO);
> +		if (!counter)
> +			return -ENOMEM;
> +
> +		auto_mode_init_counter(counter, qp, port_counter->mode.mask);
> +
> +		ret = __rdma_counter_bind_qp(counter, qp);
> +		if (ret)
> +			goto err_bind;
> +
> +		rdma_counter_res_add(counter, qp);
> +		if (!rdma_restrack_get(&counter->res)) {
> +			ret = -EINVAL;
> +			goto err_get;
> +		}

and this shouldn't be needed as the kref is inited to 1 by the
rdma_counter_alloc..

> +	}
> +
> +	return 0;
> +
> +err_get:
> +	 __rdma_counter_unbind_qp(qp);
> +	__rdma_counter_dealloc(counter);
> +err_bind:
> +	rdma_counter_free(counter);
> +	return ret;
> +}

And then all this error unwind and all the twisty __ functions should
just be a single kref_put and the release should handle everything.

Jason

  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-18 17:26 [PATCH rdma-next v4 00/17] Statistics counter support Leon Romanovsky
2019-06-18 17:26 ` [PATCH mlx5-next v4 01/17] net/mlx5: Add rts2rts_qp_counters_set_id field in hca cap Leon Romanovsky
2019-06-18 18:47   ` Saeed Mahameed
2019-06-18 17:26 ` [PATCH rdma-next v4 02/17] RDMA/restrack: Introduce statistic counter Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 03/17] RDMA/restrack: Add an API to attach a task to a resource Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 04/17] RDMA/restrack: Make is_visible_in_pid_ns() as an API Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 05/17] RDMA/counter: Add set/clear per-port auto mode support Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 06/17] RDMA/counter: Add "auto" configuration " Leon Romanovsky
2019-06-30  0:32   ` Jason Gunthorpe [this message]
2019-06-30  0:40   ` Jason Gunthorpe
2019-07-01  8:42     ` Leon Romanovsky
2019-06-18 17:26 ` [PATCH mlx5-next v4 07/17] IB/mlx5: Support set qp counter Leon Romanovsky
2019-06-18 18:49   ` Saeed Mahameed
2019-06-18 17:26 ` [PATCH rdma-next v4 08/17] IB/mlx5: Add counter set id as a parameter for mlx5_ib_query_q_counters() Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 09/17] IB/mlx5: Support statistic q counter configuration Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 10/17] RDMA/nldev: Allow counter auto mode configration through RDMA netlink Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 11/17] RDMA/netlink: Implement counter dumpit calback Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 12/17] IB/mlx5: Add counter_alloc_stats() and counter_update_stats() support Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 13/17] RDMA/core: Get sum value of all counters when perform a sysfs stat read Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 14/17] RDMA/counter: Allow manual mode configuration support Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 15/17] RDMA/nldev: Allow counter manual mode configration through RDMA netlink Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 16/17] RDMA/nldev: Allow get counter mode " Leon Romanovsky
2019-06-18 17:26 ` [PATCH rdma-next v4 17/17] RDMA/nldev: Allow get default counter statistics " Leon Romanovsky

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