1/*
2 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2007, 2008, 2014 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses.  You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 *     Redistribution and use in source and binary forms, with or
12 *     without modification, are permitted provided that the following
13 *     conditions are met:
14 *
15 *      - Redistributions of source code must retain the above
16 *        copyright notice, this list of conditions and the following
17 *        disclaimer.
18 *
19 *      - Redistributions in binary form must reproduce the above
20 *        copyright notice, this list of conditions and the following
21 *        disclaimer in the documentation and/or other materials
22 *        provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/slab.h>
35#include <linux/module.h>
36
37#include "mlx4.h"
38
39struct mlx4_device_context {
40	struct list_head	list;
41	struct list_head	bond_list;
42	struct mlx4_interface  *intf;
43	void		       *context;
44};
45
46static LIST_HEAD(intf_list);
47static LIST_HEAD(dev_list);
48static DEFINE_MUTEX(intf_mutex);
49
50static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
51{
52	struct mlx4_device_context *dev_ctx;
53
54	dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL);
55	if (!dev_ctx)
56		return;
57
58	dev_ctx->intf    = intf;
59	dev_ctx->context = intf->add(&priv->dev);
60
61	if (dev_ctx->context) {
62		spin_lock_irq(&priv->ctx_lock);
63		list_add_tail(&dev_ctx->list, &priv->ctx_list);
64		spin_unlock_irq(&priv->ctx_lock);
65		if (intf->activate) {
66			CURVNET_SET_QUIET(vnet0);
67			intf->activate(&priv->dev, dev_ctx->context);
68			CURVNET_RESTORE();
69		}
70	} else
71		kfree(dev_ctx);
72}
73
74static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
75{
76	struct mlx4_device_context *dev_ctx;
77
78	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
79		if (dev_ctx->intf == intf) {
80			spin_lock_irq(&priv->ctx_lock);
81			list_del(&dev_ctx->list);
82			spin_unlock_irq(&priv->ctx_lock);
83
84			intf->remove(&priv->dev, dev_ctx->context);
85			kfree(dev_ctx);
86			return;
87		}
88}
89
90int mlx4_register_interface(struct mlx4_interface *intf)
91{
92	struct mlx4_priv *priv;
93
94	if (!intf->add || !intf->remove)
95		return -EINVAL;
96
97	mutex_lock(&intf_mutex);
98
99	list_add_tail(&intf->list, &intf_list);
100	list_for_each_entry(priv, &dev_list, dev_list) {
101		if (mlx4_is_mfunc(&priv->dev) && (intf->flags & MLX4_INTFF_BONDING)) {
102			mlx4_dbg(&priv->dev,
103				 "SRIOV, disabling HA mode for intf proto %d\n", intf->protocol);
104			intf->flags &= ~MLX4_INTFF_BONDING;
105		}
106		mlx4_add_device(intf, priv);
107	}
108
109	mutex_unlock(&intf_mutex);
110
111	return 0;
112}
113EXPORT_SYMBOL_GPL(mlx4_register_interface);
114
115void mlx4_unregister_interface(struct mlx4_interface *intf)
116{
117	struct mlx4_priv *priv;
118
119	mutex_lock(&intf_mutex);
120
121	list_for_each_entry(priv, &dev_list, dev_list)
122		mlx4_remove_device(intf, priv);
123
124	list_del(&intf->list);
125
126	mutex_unlock(&intf_mutex);
127}
128EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
129
130int mlx4_do_bond(struct mlx4_dev *dev, bool enable)
131{
132	struct mlx4_priv *priv = mlx4_priv(dev);
133	struct mlx4_device_context *dev_ctx = NULL, *temp_dev_ctx;
134	unsigned long flags;
135	int ret;
136	LIST_HEAD(bond_list);
137
138	if (!(dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_PORT_REMAP))
139		return -ENOTSUPP;
140
141	ret = mlx4_disable_rx_port_check(dev, enable);
142	if (ret) {
143		mlx4_err(dev, "Fail to %s rx port check\n",
144			 enable ? "enable" : "disable");
145		return ret;
146	}
147	if (enable) {
148		dev->flags |= MLX4_FLAG_BONDED;
149	} else {
150		ret = mlx4_virt2phy_port_map(dev, 1, 2);
151		if (ret) {
152			mlx4_err(dev, "Fail to reset port map\n");
153			return ret;
154		}
155		dev->flags &= ~MLX4_FLAG_BONDED;
156	}
157
158	spin_lock_irqsave(&priv->ctx_lock, flags);
159	list_for_each_entry_safe(dev_ctx, temp_dev_ctx, &priv->ctx_list, list) {
160		if (dev_ctx->intf->flags & MLX4_INTFF_BONDING) {
161			list_add_tail(&dev_ctx->bond_list, &bond_list);
162			list_del(&dev_ctx->list);
163		}
164	}
165	spin_unlock_irqrestore(&priv->ctx_lock, flags);
166
167	list_for_each_entry(dev_ctx, &bond_list, bond_list) {
168		dev_ctx->intf->remove(dev, dev_ctx->context);
169		dev_ctx->context =  dev_ctx->intf->add(dev);
170
171		spin_lock_irqsave(&priv->ctx_lock, flags);
172		list_add_tail(&dev_ctx->list, &priv->ctx_list);
173		spin_unlock_irqrestore(&priv->ctx_lock, flags);
174
175		mlx4_dbg(dev, "Inrerface for protocol %d restarted with when bonded mode is %s\n",
176			 dev_ctx->intf->protocol, enable ?
177			 "enabled" : "disabled");
178	}
179	return 0;
180}
181
182void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_dev_event type,
183			 unsigned long param)
184{
185	struct mlx4_priv *priv = mlx4_priv(dev);
186	struct mlx4_device_context *dev_ctx;
187	unsigned long flags;
188
189	spin_lock_irqsave(&priv->ctx_lock, flags);
190
191	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
192		if (dev_ctx->intf->event)
193			dev_ctx->intf->event(dev, dev_ctx->context, type, param);
194
195	spin_unlock_irqrestore(&priv->ctx_lock, flags);
196}
197
198int mlx4_register_device(struct mlx4_dev *dev)
199{
200	struct mlx4_priv *priv = mlx4_priv(dev);
201	struct mlx4_interface *intf;
202
203	mutex_lock(&intf_mutex);
204
205	dev->persist->interface_state |= MLX4_INTERFACE_STATE_UP;
206	list_add_tail(&priv->dev_list, &dev_list);
207	list_for_each_entry(intf, &intf_list, list)
208		mlx4_add_device(intf, priv);
209
210	mutex_unlock(&intf_mutex);
211	mlx4_start_catas_poll(dev);
212
213	return 0;
214}
215
216void mlx4_unregister_device(struct mlx4_dev *dev)
217{
218	struct mlx4_priv *priv = mlx4_priv(dev);
219	struct mlx4_interface *intf;
220
221	if (!(dev->persist->interface_state & MLX4_INTERFACE_STATE_UP))
222		return;
223
224	mlx4_stop_catas_poll(dev);
225	mutex_lock(&intf_mutex);
226
227	list_for_each_entry(intf, &intf_list, list)
228		mlx4_remove_device(intf, priv);
229
230	list_del(&priv->dev_list);
231	dev->persist->interface_state &= ~MLX4_INTERFACE_STATE_UP;
232
233	mutex_unlock(&intf_mutex);
234}
235
236void *mlx4_get_protocol_dev(struct mlx4_dev *dev, enum mlx4_protocol proto, int port)
237{
238	struct mlx4_priv *priv = mlx4_priv(dev);
239	struct mlx4_device_context *dev_ctx;
240	unsigned long flags;
241	void *result = NULL;
242
243	spin_lock_irqsave(&priv->ctx_lock, flags);
244
245	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
246		if (dev_ctx->intf->protocol == proto && dev_ctx->intf->get_dev) {
247			result = dev_ctx->intf->get_dev(dev, dev_ctx->context, port);
248			break;
249		}
250
251	spin_unlock_irqrestore(&priv->ctx_lock, flags);
252
253	return result;
254}
255EXPORT_SYMBOL_GPL(mlx4_get_protocol_dev);
256
257