1/*
2 * Copyright (c) 2017, Mellanox Technologies. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses.  You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 *     Redistribution and use in source and binary forms, with or
11 *     without modification, are permitted provided that the following
12 *     conditions are met:
13 *
14 *      - Redistributions of source code must retain the above
15 *        copyright notice, this list of conditions and the following
16 *        disclaimer.
17 *
18 *      - Redistributions in binary form must reproduce the above
19 *        copyright notice, this list of conditions and the following
20 *        disclaimer in the documentation and/or other materials
21 *        provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#include <linux/hash.h>
34#include "ipoib.h"
35
36#define MLX5I_MAX_LOG_PKEY_SUP 7
37
38struct qpn_to_netdev {
39	struct net_device *netdev;
40	struct hlist_node hlist;
41	u32 underlay_qpn;
42};
43
44struct mlx5i_pkey_qpn_ht {
45	struct hlist_head buckets[1 << MLX5I_MAX_LOG_PKEY_SUP];
46	spinlock_t ht_lock; /* Synchronise with NAPI */
47};
48
49int mlx5i_pkey_qpn_ht_init(struct net_device *netdev)
50{
51	struct mlx5i_priv *ipriv = netdev_priv(netdev);
52	struct mlx5i_pkey_qpn_ht *qpn_htbl;
53
54	qpn_htbl = kzalloc(sizeof(*qpn_htbl), GFP_KERNEL);
55	if (!qpn_htbl)
56		return -ENOMEM;
57
58	ipriv->qpn_htbl = qpn_htbl;
59	spin_lock_init(&qpn_htbl->ht_lock);
60
61	return 0;
62}
63
64void mlx5i_pkey_qpn_ht_cleanup(struct net_device *netdev)
65{
66	struct mlx5i_priv *ipriv = netdev_priv(netdev);
67
68	kfree(ipriv->qpn_htbl);
69}
70
71static struct qpn_to_netdev *mlx5i_find_qpn_to_netdev_node(struct hlist_head *buckets,
72							   u32 qpn)
73{
74	struct hlist_head *h = &buckets[hash_32(qpn, MLX5I_MAX_LOG_PKEY_SUP)];
75	struct qpn_to_netdev *node;
76
77	hlist_for_each_entry(node, h, hlist) {
78		if (node->underlay_qpn == qpn)
79			return node;
80	}
81
82	return NULL;
83}
84
85int mlx5i_pkey_add_qpn(struct net_device *netdev, u32 qpn)
86{
87	struct mlx5i_priv *ipriv = netdev_priv(netdev);
88	struct mlx5i_pkey_qpn_ht *ht = ipriv->qpn_htbl;
89	u8 key = hash_32(qpn, MLX5I_MAX_LOG_PKEY_SUP);
90	struct qpn_to_netdev *new_node;
91
92	new_node = kzalloc(sizeof(*new_node), GFP_KERNEL);
93	if (!new_node)
94		return -ENOMEM;
95
96	new_node->netdev = netdev;
97	new_node->underlay_qpn = qpn;
98	spin_lock_bh(&ht->ht_lock);
99	hlist_add_head(&new_node->hlist, &ht->buckets[key]);
100	spin_unlock_bh(&ht->ht_lock);
101
102	return 0;
103}
104
105int mlx5i_pkey_del_qpn(struct net_device *netdev, u32 qpn)
106{
107	struct mlx5e_priv *epriv = mlx5i_epriv(netdev);
108	struct mlx5i_priv *ipriv = epriv->ppriv;
109	struct mlx5i_pkey_qpn_ht *ht = ipriv->qpn_htbl;
110	struct qpn_to_netdev *node;
111
112	node = mlx5i_find_qpn_to_netdev_node(ht->buckets, qpn);
113	if (!node) {
114		mlx5_core_warn(epriv->mdev, "QPN to netdev delete from HT failed\n");
115		return -EINVAL;
116	}
117
118	spin_lock_bh(&ht->ht_lock);
119	hlist_del_init(&node->hlist);
120	spin_unlock_bh(&ht->ht_lock);
121	kfree(node);
122
123	return 0;
124}
125
126struct net_device *mlx5i_pkey_get_netdev(struct net_device *netdev, u32 qpn)
127{
128	struct mlx5i_priv *ipriv = netdev_priv(netdev);
129	struct qpn_to_netdev *node;
130
131	node = mlx5i_find_qpn_to_netdev_node(ipriv->qpn_htbl->buckets, qpn);
132	if (!node)
133		return NULL;
134
135	return node->netdev;
136}
137
138static int mlx5i_pkey_open(struct net_device *netdev);
139static int mlx5i_pkey_close(struct net_device *netdev);
140static int mlx5i_pkey_dev_init(struct net_device *dev);
141static void mlx5i_pkey_dev_cleanup(struct net_device *netdev);
142static int mlx5i_pkey_change_mtu(struct net_device *netdev, int new_mtu);
143static int mlx5i_pkey_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
144
145static const struct net_device_ops mlx5i_pkey_netdev_ops = {
146	.ndo_open                = mlx5i_pkey_open,
147	.ndo_stop                = mlx5i_pkey_close,
148	.ndo_init                = mlx5i_pkey_dev_init,
149	.ndo_get_stats64         = mlx5i_get_stats,
150	.ndo_uninit              = mlx5i_pkey_dev_cleanup,
151	.ndo_change_mtu          = mlx5i_pkey_change_mtu,
152	.ndo_eth_ioctl            = mlx5i_pkey_ioctl,
153};
154
155/* Child NDOs */
156static int mlx5i_pkey_dev_init(struct net_device *dev)
157{
158	struct mlx5e_priv *priv = mlx5i_epriv(dev);
159	struct mlx5i_priv *ipriv, *parent_ipriv;
160	struct net_device *parent_dev;
161
162	ipriv = priv->ppriv;
163
164	/* Link to parent */
165	parent_dev = mlx5i_parent_get(dev);
166	if (!parent_dev) {
167		mlx5_core_warn(priv->mdev, "failed to get parent device\n");
168		return -EINVAL;
169	}
170
171	if (dev->num_rx_queues < parent_dev->real_num_rx_queues) {
172		mlx5_core_warn(priv->mdev,
173			       "failed to create child device with rx queues [%d] less than parent's [%d]\n",
174			       dev->num_rx_queues,
175			       parent_dev->real_num_rx_queues);
176		mlx5i_parent_put(dev);
177		return -EINVAL;
178	}
179
180	/* Get QPN to netdevice hash table from parent */
181	parent_ipriv = netdev_priv(parent_dev);
182	ipriv->qpn_htbl = parent_ipriv->qpn_htbl;
183
184	return mlx5i_dev_init(dev);
185}
186
187static int mlx5i_pkey_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
188{
189	return mlx5i_ioctl(dev, ifr, cmd);
190}
191
192static void mlx5i_pkey_dev_cleanup(struct net_device *netdev)
193{
194	mlx5i_parent_put(netdev);
195	return mlx5i_dev_cleanup(netdev);
196}
197
198static int mlx5i_pkey_open(struct net_device *netdev)
199{
200	struct mlx5e_priv *epriv = mlx5i_epriv(netdev);
201	struct mlx5i_priv *ipriv = epriv->ppriv;
202	struct mlx5_core_dev *mdev = epriv->mdev;
203	int err;
204
205	mutex_lock(&epriv->state_lock);
206
207	set_bit(MLX5E_STATE_OPENED, &epriv->state);
208
209	err = mlx5i_init_underlay_qp(epriv);
210	if (err) {
211		mlx5_core_warn(mdev, "prepare child underlay qp state failed, %d\n", err);
212		goto err_release_lock;
213	}
214
215	err = mlx5_fs_add_rx_underlay_qpn(mdev, ipriv->qpn);
216	if (err) {
217		mlx5_core_warn(mdev, "attach child underlay qp to ft failed, %d\n", err);
218		goto err_unint_underlay_qp;
219	}
220
221	err = mlx5i_create_tis(mdev, ipriv->qpn, &ipriv->tisn);
222	if (err) {
223		mlx5_core_warn(mdev, "create child tis failed, %d\n", err);
224		goto err_remove_rx_uderlay_qp;
225	}
226
227	err = mlx5e_open_channels(epriv, &epriv->channels);
228	if (err) {
229		mlx5_core_warn(mdev, "opening child channels failed, %d\n", err);
230		goto err_clear_state_opened_flag;
231	}
232	err = epriv->profile->update_rx(epriv);
233	if (err)
234		goto err_close_channels;
235	mlx5e_activate_priv_channels(epriv);
236	mutex_unlock(&epriv->state_lock);
237
238	return 0;
239
240err_close_channels:
241	mlx5e_close_channels(&epriv->channels);
242err_clear_state_opened_flag:
243	mlx5e_destroy_tis(mdev, ipriv->tisn);
244err_remove_rx_uderlay_qp:
245	mlx5_fs_remove_rx_underlay_qpn(mdev, ipriv->qpn);
246err_unint_underlay_qp:
247	mlx5i_uninit_underlay_qp(epriv);
248err_release_lock:
249	clear_bit(MLX5E_STATE_OPENED, &epriv->state);
250	mutex_unlock(&epriv->state_lock);
251	return err;
252}
253
254static int mlx5i_pkey_close(struct net_device *netdev)
255{
256	struct mlx5e_priv *priv = mlx5i_epriv(netdev);
257	struct mlx5i_priv *ipriv = priv->ppriv;
258	struct mlx5_core_dev *mdev = priv->mdev;
259
260	mutex_lock(&priv->state_lock);
261
262	if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
263		goto unlock;
264
265	clear_bit(MLX5E_STATE_OPENED, &priv->state);
266
267	netif_carrier_off(priv->netdev);
268	mlx5_fs_remove_rx_underlay_qpn(mdev, ipriv->qpn);
269	mlx5i_uninit_underlay_qp(priv);
270	mlx5e_deactivate_priv_channels(priv);
271	mlx5e_close_channels(&priv->channels);
272	mlx5e_destroy_tis(mdev, ipriv->tisn);
273unlock:
274	mutex_unlock(&priv->state_lock);
275	return 0;
276}
277
278static int mlx5i_pkey_change_mtu(struct net_device *netdev, int new_mtu)
279{
280	struct mlx5e_priv *priv = mlx5i_epriv(netdev);
281
282	mutex_lock(&priv->state_lock);
283	netdev->mtu = new_mtu;
284	mutex_unlock(&priv->state_lock);
285
286	return 0;
287}
288
289/* Called directly after IPoIB netdevice was created to initialize SW structs */
290static int mlx5i_pkey_init(struct mlx5_core_dev *mdev,
291			   struct net_device *netdev)
292{
293	struct mlx5e_priv *priv  = mlx5i_epriv(netdev);
294	int err;
295
296	err = mlx5i_init(mdev, netdev);
297	if (err)
298		return err;
299
300	/* Override parent ndo */
301	netdev->netdev_ops = &mlx5i_pkey_netdev_ops;
302
303	/* Set child limited ethtool support */
304	netdev->ethtool_ops = &mlx5i_pkey_ethtool_ops;
305
306	/* Use dummy rqs */
307	priv->channels.params.log_rq_mtu_frames = MLX5E_PARAMS_MINIMUM_LOG_RQ_SIZE;
308
309	return 0;
310}
311
312/* Called directly before IPoIB netdevice is destroyed to cleanup SW structs */
313static void mlx5i_pkey_cleanup(struct mlx5e_priv *priv)
314{
315	mlx5i_cleanup(priv);
316}
317
318static int mlx5i_pkey_init_tx(struct mlx5e_priv *priv)
319{
320	int err;
321
322	err = mlx5i_create_underlay_qp(priv);
323	if (err)
324		mlx5_core_warn(priv->mdev, "create child underlay QP failed, %d\n", err);
325
326	return err;
327}
328
329static void mlx5i_pkey_cleanup_tx(struct mlx5e_priv *priv)
330{
331	struct mlx5i_priv *ipriv = priv->ppriv;
332
333	mlx5i_destroy_underlay_qp(priv->mdev, ipriv->qpn);
334}
335
336static int mlx5i_pkey_init_rx(struct mlx5e_priv *priv)
337{
338	/* Since the rx resources are shared between child and parent, the
339	 * parent interface is taking care of rx resource allocation and init
340	 */
341	return 0;
342}
343
344static void mlx5i_pkey_cleanup_rx(struct mlx5e_priv *priv)
345{
346	/* Since the rx resources are shared between child and parent, the
347	 * parent interface is taking care of rx resource free and de-init
348	 */
349}
350
351static const struct mlx5e_profile mlx5i_pkey_nic_profile = {
352	.init		   = mlx5i_pkey_init,
353	.cleanup	   = mlx5i_pkey_cleanup,
354	.init_tx	   = mlx5i_pkey_init_tx,
355	.cleanup_tx	   = mlx5i_pkey_cleanup_tx,
356	.init_rx	   = mlx5i_pkey_init_rx,
357	.cleanup_rx	   = mlx5i_pkey_cleanup_rx,
358	.enable		   = NULL,
359	.disable	   = NULL,
360	.update_rx	   = mlx5i_update_nic_rx,
361	.update_stats	   = NULL,
362	.rx_handlers       = &mlx5i_rx_handlers,
363	.max_tc		   = MLX5I_MAX_NUM_TC,
364	.get_tisn          = mlx5i_get_tisn,
365};
366
367const struct mlx5e_profile *mlx5i_pkey_get_profile(void)
368{
369	return &mlx5i_pkey_nic_profile;
370}
371