1/*
2 * Copyright (c) 2007 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
34#include <linux/cpumask.h>
35#include <linux/module.h>
36#include <linux/delay.h>
37#include <linux/netdevice.h>
38#include <linux/slab.h>
39
40#include <linux/mlx4/driver.h>
41#include <linux/mlx4/device.h>
42#include <linux/mlx4/cmd.h>
43
44#include "mlx4_en.h"
45
46MODULE_AUTHOR("Liran Liss, Yevgeny Petrilin");
47MODULE_DESCRIPTION("Mellanox ConnectX HCA Ethernet driver");
48MODULE_LICENSE("Dual BSD/GPL");
49MODULE_VERSION(DRV_VERSION " ("DRV_RELDATE")");
50
51static const char mlx4_en_version[] =
52	DRV_NAME ": Mellanox ConnectX HCA Ethernet driver v"
53	DRV_VERSION " (" DRV_RELDATE ")\n";
54
55#define MLX4_EN_PARM_INT(X, def_val, desc) \
56	static unsigned int X = def_val;\
57	module_param(X , uint, 0444); \
58	MODULE_PARM_DESC(X, desc);
59
60
61/*
62 * Device scope module parameters
63 */
64
65/* Enable RSS UDP traffic */
66MLX4_EN_PARM_INT(udp_rss, 1,
67		 "Enable RSS for incomming UDP traffic or disabled (0)");
68
69/* Priority pausing */
70MLX4_EN_PARM_INT(pfctx, 0, "Priority based Flow Control policy on TX[7:0]."
71			   " Per priority bit mask");
72MLX4_EN_PARM_INT(pfcrx, 0, "Priority based Flow Control policy on RX[7:0]."
73			   " Per priority bit mask");
74
75int en_print(const char *level, const struct mlx4_en_priv *priv,
76	     const char *format, ...)
77{
78	va_list args;
79	struct va_format vaf;
80	int i;
81
82	va_start(args, format);
83
84	vaf.fmt = format;
85	vaf.va = &args;
86	if (priv->registered)
87		i = printk("%s%s: %s: %pV",
88			   level, DRV_NAME, priv->dev->name, &vaf);
89	else
90		i = printk("%s%s: %s: Port %d: %pV",
91			   level, DRV_NAME, dev_name(&priv->mdev->pdev->dev),
92			   priv->port, &vaf);
93	va_end(args);
94
95	return i;
96}
97
98static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
99{
100	struct mlx4_en_profile *params = &mdev->profile;
101	int i;
102
103	params->udp_rss = udp_rss;
104	if (params->udp_rss && !(mdev->dev->caps.flags
105					& MLX4_DEV_CAP_FLAG_UDP_RSS)) {
106		mlx4_warn(mdev, "UDP RSS is not supported on this device.\n");
107		params->udp_rss = 0;
108	}
109	for (i = 1; i <= MLX4_MAX_PORTS; i++) {
110		params->prof[i].rx_pause = 1;
111		params->prof[i].rx_ppp = pfcrx;
112		params->prof[i].tx_pause = 1;
113		params->prof[i].tx_ppp = pfctx;
114		params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE;
115		params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
116		params->prof[i].tx_ring_num = MLX4_EN_NUM_TX_RINGS +
117			(!!pfcrx) * MLX4_EN_NUM_PPP_RINGS;
118		params->prof[i].rss_rings = 0;
119	}
120
121	return 0;
122}
123
124static void *mlx4_en_get_netdev(struct mlx4_dev *dev, void *ctx, u8 port)
125{
126	struct mlx4_en_dev *endev = ctx;
127
128	return endev->pndev[port];
129}
130
131static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr,
132			  enum mlx4_dev_event event, int port)
133{
134	struct mlx4_en_dev *mdev = (struct mlx4_en_dev *) endev_ptr;
135	struct mlx4_en_priv *priv;
136
137	if (!mdev->pndev[port])
138		return;
139
140	priv = netdev_priv(mdev->pndev[port]);
141	switch (event) {
142	case MLX4_DEV_EVENT_PORT_UP:
143	case MLX4_DEV_EVENT_PORT_DOWN:
144		/* To prevent races, we poll the link state in a separate
145		  task rather than changing it here */
146		priv->link_state = event;
147		queue_work(mdev->workqueue, &priv->linkstate_task);
148		break;
149
150	case MLX4_DEV_EVENT_CATASTROPHIC_ERROR:
151		mlx4_err(mdev, "Internal error detected, restarting device\n");
152		break;
153
154	default:
155		mlx4_warn(mdev, "Unhandled event: %d\n", event);
156	}
157}
158
159static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
160{
161	struct mlx4_en_dev *mdev = endev_ptr;
162	int i;
163
164	mutex_lock(&mdev->state_lock);
165	mdev->device_up = false;
166	mutex_unlock(&mdev->state_lock);
167
168	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
169		if (mdev->pndev[i])
170			mlx4_en_destroy_netdev(mdev->pndev[i]);
171
172	flush_workqueue(mdev->workqueue);
173	destroy_workqueue(mdev->workqueue);
174	mlx4_mr_free(dev, &mdev->mr);
175	iounmap(mdev->uar_map);
176	mlx4_uar_free(dev, &mdev->priv_uar);
177	mlx4_pd_free(dev, mdev->priv_pdn);
178	kfree(mdev);
179}
180
181static void *mlx4_en_add(struct mlx4_dev *dev)
182{
183	struct mlx4_en_dev *mdev;
184	int i;
185	int err;
186
187	printk_once(KERN_INFO "%s", mlx4_en_version);
188
189	mdev = kzalloc(sizeof *mdev, GFP_KERNEL);
190	if (!mdev) {
191		dev_err(&dev->pdev->dev, "Device struct alloc failed, "
192			"aborting.\n");
193		err = -ENOMEM;
194		goto err_free_res;
195	}
196
197	if (mlx4_pd_alloc(dev, &mdev->priv_pdn))
198		goto err_free_dev;
199
200	if (mlx4_uar_alloc(dev, &mdev->priv_uar))
201		goto err_pd;
202
203	mdev->uar_map = ioremap((phys_addr_t) mdev->priv_uar.pfn << PAGE_SHIFT,
204				PAGE_SIZE);
205	if (!mdev->uar_map)
206		goto err_uar;
207	spin_lock_init(&mdev->uar_lock);
208
209	mdev->dev = dev;
210	mdev->dma_device = &(dev->pdev->dev);
211	mdev->pdev = dev->pdev;
212	mdev->device_up = false;
213
214	mdev->LSO_support = !!(dev->caps.flags & (1 << 15));
215	if (!mdev->LSO_support)
216		mlx4_warn(mdev, "LSO not supported, please upgrade to later "
217				"FW version to enable LSO\n");
218
219	if (mlx4_mr_alloc(mdev->dev, mdev->priv_pdn, 0, ~0ull,
220			 MLX4_PERM_LOCAL_WRITE |  MLX4_PERM_LOCAL_READ,
221			 0, 0, &mdev->mr)) {
222		mlx4_err(mdev, "Failed allocating memory region\n");
223		goto err_map;
224	}
225	if (mlx4_mr_enable(mdev->dev, &mdev->mr)) {
226		mlx4_err(mdev, "Failed enabling memory region\n");
227		goto err_mr;
228	}
229
230	/* Build device profile according to supplied module parameters */
231	err = mlx4_en_get_profile(mdev);
232	if (err) {
233		mlx4_err(mdev, "Bad module parameters, aborting.\n");
234		goto err_mr;
235	}
236
237	/* Configure which ports to start according to module parameters */
238	mdev->port_cnt = 0;
239	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
240		mdev->port_cnt++;
241
242	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
243		if (!dev->caps.comp_pool) {
244			mdev->profile.prof[i].rx_ring_num =
245				rounddown_pow_of_two(max_t(int, MIN_RX_RINGS,
246							   min_t(int,
247								 dev->caps.num_comp_vectors,
248								 MAX_RX_RINGS)));
249		} else {
250			mdev->profile.prof[i].rx_ring_num = rounddown_pow_of_two(
251				min_t(int, dev->caps.comp_pool/
252				      dev->caps.num_ports - 1 , MAX_MSIX_P_PORT - 1));
253		}
254	}
255
256	/* Create our own workqueue for reset/multicast tasks
257	 * Note: we cannot use the shared workqueue because of deadlocks caused
258	 *       by the rtnl lock */
259	mdev->workqueue = create_singlethread_workqueue("mlx4_en");
260	if (!mdev->workqueue) {
261		err = -ENOMEM;
262		goto err_mr;
263	}
264
265	/* At this stage all non-port specific tasks are complete:
266	 * mark the card state as up */
267	mutex_init(&mdev->state_lock);
268	mdev->device_up = true;
269
270	/* Setup ports */
271
272	/* Create a netdev for each port */
273	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
274		mlx4_info(mdev, "Activating port:%d\n", i);
275		if (mlx4_en_init_netdev(mdev, i, &mdev->profile.prof[i]))
276			mdev->pndev[i] = NULL;
277	}
278	return mdev;
279
280err_mr:
281	mlx4_mr_free(dev, &mdev->mr);
282err_map:
283	if (!mdev->uar_map)
284		iounmap(mdev->uar_map);
285err_uar:
286	mlx4_uar_free(dev, &mdev->priv_uar);
287err_pd:
288	mlx4_pd_free(dev, mdev->priv_pdn);
289err_free_dev:
290	kfree(mdev);
291err_free_res:
292	return NULL;
293}
294
295static struct mlx4_interface mlx4_en_interface = {
296	.add		= mlx4_en_add,
297	.remove		= mlx4_en_remove,
298	.event		= mlx4_en_event,
299	.get_dev	= mlx4_en_get_netdev,
300	.protocol	= MLX4_PROT_ETH,
301};
302
303static int __init mlx4_en_init(void)
304{
305	return mlx4_register_interface(&mlx4_en_interface);
306}
307
308static void __exit mlx4_en_cleanup(void)
309{
310	mlx4_unregister_interface(&mlx4_en_interface);
311}
312
313module_init(mlx4_en_init);
314module_exit(mlx4_en_cleanup);
315
316