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 
46 MODULE_AUTHOR("Liran Liss, Yevgeny Petrilin");
47 MODULE_DESCRIPTION("Mellanox ConnectX HCA Ethernet driver");
48 MODULE_LICENSE("Dual BSD/GPL");
49 MODULE_VERSION(DRV_VERSION " ("DRV_RELDATE")");
50 
51 static 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 */
66 MLX4_EN_PARM_INT(udp_rss, 1,
67 		 "Enable RSS for incoming UDP traffic or disabled (0)");
68 
69 /* Priority pausing */
70 MLX4_EN_PARM_INT(pfctx, 0, "Priority based Flow Control policy on TX[7:0]."
71 			   " Per priority bit mask");
72 MLX4_EN_PARM_INT(pfcrx, 0, "Priority based Flow Control policy on RX[7:0]."
73 			   " Per priority bit mask");
74 
75 MLX4_EN_PARM_INT(inline_thold, MAX_INLINE,
76 		 "Threshold for using inline data (range: 17-104, default: 104)");
77 
78 #define MAX_PFC_TX     0xff
79 #define MAX_PFC_RX     0xff
80 
81 void en_print(const char *level, const struct mlx4_en_priv *priv,
82 	      const char *format, ...)
83 {
84 	va_list args;
85 	struct va_format vaf;
86 
87 	va_start(args, format);
88 
89 	vaf.fmt = format;
90 	vaf.va = &args;
91 	if (priv->registered)
92 		printk("%s%s: %s: %pV",
93 		       level, DRV_NAME, priv->dev->name, &vaf);
94 	else
95 		printk("%s%s: %s: Port %d: %pV",
96 		       level, DRV_NAME, dev_name(&priv->mdev->pdev->dev),
97 		       priv->port, &vaf);
98 	va_end(args);
99 }
100 
101 void mlx4_en_update_loopback_state(struct net_device *dev,
102 				   netdev_features_t features)
103 {
104 	struct mlx4_en_priv *priv = netdev_priv(dev);
105 
106 	priv->flags &= ~(MLX4_EN_FLAG_RX_FILTER_NEEDED|
107 			MLX4_EN_FLAG_ENABLE_HW_LOOPBACK);
108 
109 	/* Drop the packet if SRIOV is not enabled
110 	 * and not performing the selftest or flb disabled
111 	 */
112 	if (mlx4_is_mfunc(priv->mdev->dev) &&
113 	    !(features & NETIF_F_LOOPBACK) && !priv->validate_loopback)
114 		priv->flags |= MLX4_EN_FLAG_RX_FILTER_NEEDED;
115 
116 	/* Set dmac in Tx WQE if we are in SRIOV mode or if loopback selftest
117 	 * is requested
118 	 */
119 	if (mlx4_is_mfunc(priv->mdev->dev) || priv->validate_loopback)
120 		priv->flags |= MLX4_EN_FLAG_ENABLE_HW_LOOPBACK;
121 }
122 
123 static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
124 {
125 	struct mlx4_en_profile *params = &mdev->profile;
126 	int i;
127 
128 	params->udp_rss = udp_rss;
129 	params->num_tx_rings_p_up = mlx4_low_memory_profile() ?
130 		MLX4_EN_MIN_TX_RING_P_UP :
131 		min_t(int, num_online_cpus(), MLX4_EN_MAX_TX_RING_P_UP);
132 
133 	if (params->udp_rss && !(mdev->dev->caps.flags
134 					& MLX4_DEV_CAP_FLAG_UDP_RSS)) {
135 		mlx4_warn(mdev, "UDP RSS is not supported on this device\n");
136 		params->udp_rss = 0;
137 	}
138 	for (i = 1; i <= MLX4_MAX_PORTS; i++) {
139 		params->prof[i].rx_pause = 1;
140 		params->prof[i].rx_ppp = pfcrx;
141 		params->prof[i].tx_pause = 1;
142 		params->prof[i].tx_ppp = pfctx;
143 		params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE;
144 		params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
145 		params->prof[i].tx_ring_num = params->num_tx_rings_p_up *
146 			MLX4_EN_NUM_UP;
147 		params->prof[i].rss_rings = 0;
148 		params->prof[i].inline_thold = inline_thold;
149 	}
150 
151 	return 0;
152 }
153 
154 static void *mlx4_en_get_netdev(struct mlx4_dev *dev, void *ctx, u8 port)
155 {
156 	struct mlx4_en_dev *endev = ctx;
157 
158 	return endev->pndev[port];
159 }
160 
161 static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr,
162 			  enum mlx4_dev_event event, unsigned long port)
163 {
164 	struct mlx4_en_dev *mdev = (struct mlx4_en_dev *) endev_ptr;
165 	struct mlx4_en_priv *priv;
166 
167 	switch (event) {
168 	case MLX4_DEV_EVENT_PORT_UP:
169 	case MLX4_DEV_EVENT_PORT_DOWN:
170 		if (!mdev->pndev[port])
171 			return;
172 		priv = netdev_priv(mdev->pndev[port]);
173 		/* To prevent races, we poll the link state in a separate
174 		  task rather than changing it here */
175 		priv->link_state = event;
176 		queue_work(mdev->workqueue, &priv->linkstate_task);
177 		break;
178 
179 	case MLX4_DEV_EVENT_CATASTROPHIC_ERROR:
180 		mlx4_err(mdev, "Internal error detected, restarting device\n");
181 		break;
182 
183 	case MLX4_DEV_EVENT_SLAVE_INIT:
184 	case MLX4_DEV_EVENT_SLAVE_SHUTDOWN:
185 		break;
186 	default:
187 		if (port < 1 || port > dev->caps.num_ports ||
188 		    !mdev->pndev[port])
189 			return;
190 		mlx4_warn(mdev, "Unhandled event %d for port %d\n", event,
191 			  (int) port);
192 	}
193 }
194 
195 static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
196 {
197 	struct mlx4_en_dev *mdev = endev_ptr;
198 	int i;
199 
200 	mutex_lock(&mdev->state_lock);
201 	mdev->device_up = false;
202 	mutex_unlock(&mdev->state_lock);
203 
204 	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
205 		if (mdev->pndev[i])
206 			mlx4_en_destroy_netdev(mdev->pndev[i]);
207 
208 	if (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_TS)
209 		mlx4_en_remove_timestamp(mdev);
210 
211 	flush_workqueue(mdev->workqueue);
212 	destroy_workqueue(mdev->workqueue);
213 	(void) mlx4_mr_free(dev, &mdev->mr);
214 	iounmap(mdev->uar_map);
215 	mlx4_uar_free(dev, &mdev->priv_uar);
216 	mlx4_pd_free(dev, mdev->priv_pdn);
217 	kfree(mdev);
218 }
219 
220 static void *mlx4_en_add(struct mlx4_dev *dev)
221 {
222 	struct mlx4_en_dev *mdev;
223 	int i;
224 
225 	printk_once(KERN_INFO "%s", mlx4_en_version);
226 
227 	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
228 	if (!mdev)
229 		goto err_free_res;
230 
231 	if (mlx4_pd_alloc(dev, &mdev->priv_pdn))
232 		goto err_free_dev;
233 
234 	if (mlx4_uar_alloc(dev, &mdev->priv_uar))
235 		goto err_pd;
236 
237 	mdev->uar_map = ioremap((phys_addr_t) mdev->priv_uar.pfn << PAGE_SHIFT,
238 				PAGE_SIZE);
239 	if (!mdev->uar_map)
240 		goto err_uar;
241 	spin_lock_init(&mdev->uar_lock);
242 
243 	mdev->dev = dev;
244 	mdev->dma_device = &(dev->pdev->dev);
245 	mdev->pdev = dev->pdev;
246 	mdev->device_up = false;
247 
248 	mdev->LSO_support = !!(dev->caps.flags & (1 << 15));
249 	if (!mdev->LSO_support)
250 		mlx4_warn(mdev, "LSO not supported, please upgrade to later FW version to enable LSO\n");
251 
252 	if (mlx4_mr_alloc(mdev->dev, mdev->priv_pdn, 0, ~0ull,
253 			 MLX4_PERM_LOCAL_WRITE |  MLX4_PERM_LOCAL_READ,
254 			 0, 0, &mdev->mr)) {
255 		mlx4_err(mdev, "Failed allocating memory region\n");
256 		goto err_map;
257 	}
258 	if (mlx4_mr_enable(mdev->dev, &mdev->mr)) {
259 		mlx4_err(mdev, "Failed enabling memory region\n");
260 		goto err_mr;
261 	}
262 
263 	/* Build device profile according to supplied module parameters */
264 	if (mlx4_en_get_profile(mdev)) {
265 		mlx4_err(mdev, "Bad module parameters, aborting\n");
266 		goto err_mr;
267 	}
268 
269 	/* Configure which ports to start according to module parameters */
270 	mdev->port_cnt = 0;
271 	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
272 		mdev->port_cnt++;
273 
274 	/* Initialize time stamp mechanism */
275 	if (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_TS)
276 		mlx4_en_init_timestamp(mdev);
277 
278 	/* Set default number of RX rings*/
279 	mlx4_en_set_num_rx_rings(mdev);
280 
281 	/* Create our own workqueue for reset/multicast tasks
282 	 * Note: we cannot use the shared workqueue because of deadlocks caused
283 	 *       by the rtnl lock */
284 	mdev->workqueue = create_singlethread_workqueue("mlx4_en");
285 	if (!mdev->workqueue)
286 		goto err_mr;
287 
288 	/* At this stage all non-port specific tasks are complete:
289 	 * mark the card state as up */
290 	mutex_init(&mdev->state_lock);
291 	mdev->device_up = true;
292 
293 	/* Setup ports */
294 
295 	/* Create a netdev for each port */
296 	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
297 		mlx4_info(mdev, "Activating port:%d\n", i);
298 		if (mlx4_en_init_netdev(mdev, i, &mdev->profile.prof[i]))
299 			mdev->pndev[i] = NULL;
300 	}
301 
302 	return mdev;
303 
304 err_mr:
305 	(void) mlx4_mr_free(dev, &mdev->mr);
306 err_map:
307 	if (mdev->uar_map)
308 		iounmap(mdev->uar_map);
309 err_uar:
310 	mlx4_uar_free(dev, &mdev->priv_uar);
311 err_pd:
312 	mlx4_pd_free(dev, mdev->priv_pdn);
313 err_free_dev:
314 	kfree(mdev);
315 err_free_res:
316 	return NULL;
317 }
318 
319 static struct mlx4_interface mlx4_en_interface = {
320 	.add		= mlx4_en_add,
321 	.remove		= mlx4_en_remove,
322 	.event		= mlx4_en_event,
323 	.get_dev	= mlx4_en_get_netdev,
324 	.protocol	= MLX4_PROT_ETH,
325 };
326 
327 static void mlx4_en_verify_params(void)
328 {
329 	if (pfctx > MAX_PFC_TX) {
330 		pr_warn("mlx4_en: WARNING: illegal module parameter pfctx 0x%x - should be in range 0-0x%x, will be changed to default (0)\n",
331 			pfctx, MAX_PFC_TX);
332 		pfctx = 0;
333 	}
334 
335 	if (pfcrx > MAX_PFC_RX) {
336 		pr_warn("mlx4_en: WARNING: illegal module parameter pfcrx 0x%x - should be in range 0-0x%x, will be changed to default (0)\n",
337 			pfcrx, MAX_PFC_RX);
338 		pfcrx = 0;
339 	}
340 
341 	if (inline_thold < MIN_PKT_LEN || inline_thold > MAX_INLINE) {
342 		pr_warn("mlx4_en: WARNING: illegal module parameter inline_thold %d - should be in range %d-%d, will be changed to default (%d)\n",
343 			inline_thold, MIN_PKT_LEN, MAX_INLINE, MAX_INLINE);
344 		inline_thold = MAX_INLINE;
345 	}
346 }
347 
348 static int __init mlx4_en_init(void)
349 {
350 	mlx4_en_verify_params();
351 
352 	return mlx4_register_interface(&mlx4_en_interface);
353 }
354 
355 static void __exit mlx4_en_cleanup(void)
356 {
357 	mlx4_unregister_interface(&mlx4_en_interface);
358 }
359 
360 module_init(mlx4_en_init);
361 module_exit(mlx4_en_cleanup);
362 
363