netdev - Re: [RFC v1 for accelerated IPoIB 25/25] mlx5_ib: skeleton for mlx5_ib to support ipoib

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Date:   Mon, 13 Mar 2017 23:07:30 -0700
From:   "Vishwanathapura, Niranjana" <niranjana.vishwanathapura@...el.com>
To:     Erez Shitrit <erezsh@...lanox.com>
Cc:     dledford@...hat.com, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org, valex@...lanox.com, leonro@...lanox.com,
        saedm@...lanox.com, erezsh@....mellanox.co.il
Subject: Re: [RFC v1 for accelerated IPoIB 25/25] mlx5_ib: skeleton for
 mlx5_ib to support ipoib_ops

On Mon, Mar 13, 2017 at 08:31:36PM +0200, Erez Shitrit wrote:
>+int mlx5_ib_dev_init(struct net_device *dev, struct ib_device *hca,
>+		     int *qp_num)
>+{
>+	void *next_priv = ipoib_dev_priv(dev);
>+	struct rdma_netdev *rn = netdev_priv(dev);
>+	struct mlx5_ib_dev *ib_dev = to_mdev(hca);
>+	int ret;
>+
>+	ret = mlx5i_attach(ib_dev->mdev, next_priv);
>+	if (ret) {
>+		pr_err("Failed resources allocation for device: %s ret: %d\n",
>+		       dev->name, ret);
>+		return ret;
>+	}
>+
>+	*qp_num = rn->qp_num;
>+
>+	pr_debug("resources allocated for device: %s\n", dev->name);
>+
>+	return 0;
>+}
>+
>+void mlx5_ib_dev_cleanup(struct net_device *dev, struct ib_device *hca)
>+{
>+	void *next_priv = ipoib_dev_priv(dev);
>+	struct rdma_netdev *rn = netdev_priv(dev);
>+	struct mlx5_ib_dev *ib_dev = to_mdev(hca);
>+	struct mlx5_qp_context context;
>+	int ret;
>+
>+	/* detach qp from flow-steering by reset it */
>+	ret = mlx5_core_qp_modify(ib_dev->mdev,
>+				  MLX5_CMD_OP_2RST_QP, 0, &context,
>+				  (struct mlx5_core_qp *)rn->context);
>+	if (ret)
>+		pr_err("%s failed (ret: %d) to reset QP\n", __func__, ret);
>+
>+	mlx5i_detach(ib_dev->mdev, next_priv);
>+
>+	mlx5_ib_clean_qp(ib_dev, (struct mlx5_core_qp *)rn->context);
>+}
>+

Why can't use ndo_init() and ndo_uninit() here (just like open and stop below).
We really don't need to pass in hca here (or in any other interface function) 
as it is already made available to the driver during alloc_rdma_netdev.
Also, why qp_num is an output parameter in the init function? Ipoib can access 
rn->qp_num which this init function is returning.

>+struct net_device *mlx5_alloc_rdma_netdev(struct ib_device *hca,
>+				     u8 port_num,
>+				     enum rdma_netdev_t type,
>+				     const char *name,
>+				     unsigned char name_assign_type,
>+				     void (*setup)(struct net_device *))
>+{

Probably need to check the 'type' here as any rdma netdev client can call this 
function (with different rdma_netdev type) and cause driver to misbehave.

>+void mlx5_free_rdma_netdev(struct net_device *netdev)
>+{
>+}

May be it is safer and cleaner for this function undo what alloc does here 
(instead of doing it in other places)?

>-- 
>1.8.3.1
>
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