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 incoming 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
75MLX4_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
81void 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
101void 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	if (features & NETIF_F_LOOPBACK)
107		priv->ctrl_flags |= cpu_to_be32(MLX4_WQE_CTRL_FORCE_LOOPBACK);
108	else
109		priv->ctrl_flags &= cpu_to_be32(~MLX4_WQE_CTRL_FORCE_LOOPBACK);
110
111	priv->flags &= ~(MLX4_EN_FLAG_RX_FILTER_NEEDED|
112			MLX4_EN_FLAG_ENABLE_HW_LOOPBACK);
113
114	/* Drop the packet if SRIOV is not enabled
115	 * and not performing the selftest or flb disabled
116	 */
117	if (mlx4_is_mfunc(priv->mdev->dev) &&
118	    !(features & NETIF_F_LOOPBACK) && !priv->validate_loopback)
119		priv->flags |= MLX4_EN_FLAG_RX_FILTER_NEEDED;
120
121	/* Set dmac in Tx WQE if we are in SRIOV mode or if loopback selftest
122	 * is requested
123	 */
124	if (mlx4_is_mfunc(priv->mdev->dev) || priv->validate_loopback)
125		priv->flags |= MLX4_EN_FLAG_ENABLE_HW_LOOPBACK;
126
127	mutex_lock(&priv->mdev->state_lock);
128	if (priv->mdev->dev->caps.flags2 &
129	    MLX4_DEV_CAP_FLAG2_UPDATE_QP_SRC_CHECK_LB &&
130	    priv->rss_map.indir_qp.qpn) {
131		int i;
132		int err = 0;
133		int loopback = !!(features & NETIF_F_LOOPBACK);
134
135		for (i = 0; i < priv->rx_ring_num; i++) {
136			int ret;
137
138			ret = mlx4_en_change_mcast_lb(priv,
139						      &priv->rss_map.qps[i],
140						      loopback);
141			if (!err)
142				err = ret;
143		}
144		if (err)
145			mlx4_warn(priv->mdev, "failed to change mcast loopback\n");
146	}
147	mutex_unlock(&priv->mdev->state_lock);
148}
149
150static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
151{
152	struct mlx4_en_profile *params = &mdev->profile;
153	int i;
154
155	params->udp_rss = udp_rss;
156	params->num_tx_rings_p_up = mlx4_low_memory_profile() ?
157		MLX4_EN_MIN_TX_RING_P_UP :
158		min_t(int, num_online_cpus(), MLX4_EN_MAX_TX_RING_P_UP);
159
160	if (params->udp_rss && !(mdev->dev->caps.flags
161					& MLX4_DEV_CAP_FLAG_UDP_RSS)) {
162		mlx4_warn(mdev, "UDP RSS is not supported on this device\n");
163		params->udp_rss = 0;
164	}
165	for (i = 1; i <= MLX4_MAX_PORTS; i++) {
166		params->prof[i].rx_pause = 1;
167		params->prof[i].rx_ppp = pfcrx;
168		params->prof[i].tx_pause = 1;
169		params->prof[i].tx_ppp = pfctx;
170		params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE;
171		params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
172		params->prof[i].tx_ring_num = params->num_tx_rings_p_up *
173			MLX4_EN_NUM_UP;
174		params->prof[i].rss_rings = 0;
175		params->prof[i].inline_thold = inline_thold;
176	}
177
178	return 0;
179}
180
181static void *mlx4_en_get_netdev(struct mlx4_dev *dev, void *ctx, u8 port)
182{
183	struct mlx4_en_dev *endev = ctx;
184
185	return endev->pndev[port];
186}
187
188static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr,
189			  enum mlx4_dev_event event, unsigned long port)
190{
191	struct mlx4_en_dev *mdev = (struct mlx4_en_dev *) endev_ptr;
192	struct mlx4_en_priv *priv;
193
194	switch (event) {
195	case MLX4_DEV_EVENT_PORT_UP:
196	case MLX4_DEV_EVENT_PORT_DOWN:
197		if (!mdev->pndev[port])
198			return;
199		priv = netdev_priv(mdev->pndev[port]);
200		/* To prevent races, we poll the link state in a separate
201		  task rather than changing it here */
202		priv->link_state = event;
203		queue_work(mdev->workqueue, &priv->linkstate_task);
204		break;
205
206	case MLX4_DEV_EVENT_CATASTROPHIC_ERROR:
207		mlx4_err(mdev, "Internal error detected, restarting device\n");
208		break;
209
210	case MLX4_DEV_EVENT_SLAVE_INIT:
211	case MLX4_DEV_EVENT_SLAVE_SHUTDOWN:
212		break;
213	default:
214		if (port < 1 || port > dev->caps.num_ports ||
215		    !mdev->pndev[port])
216			return;
217		mlx4_warn(mdev, "Unhandled event %d for port %d\n", event,
218			  (int) port);
219	}
220}
221
222static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
223{
224	struct mlx4_en_dev *mdev = endev_ptr;
225	int i;
226
227	mutex_lock(&mdev->state_lock);
228	mdev->device_up = false;
229	mutex_unlock(&mdev->state_lock);
230
231	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
232		if (mdev->pndev[i])
233			mlx4_en_destroy_netdev(mdev->pndev[i]);
234
235	flush_workqueue(mdev->workqueue);
236	destroy_workqueue(mdev->workqueue);
237	(void) mlx4_mr_free(dev, &mdev->mr);
238	iounmap(mdev->uar_map);
239	mlx4_uar_free(dev, &mdev->priv_uar);
240	mlx4_pd_free(dev, mdev->priv_pdn);
241	if (mdev->nb.notifier_call)
242		unregister_netdevice_notifier(&mdev->nb);
243	kfree(mdev);
244}
245
246static void mlx4_en_activate(struct mlx4_dev *dev, void *ctx)
247{
248	int i;
249	struct mlx4_en_dev *mdev = ctx;
250
251	/* Create a netdev for each port */
252	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
253		mlx4_info(mdev, "Activating port:%d\n", i);
254		if (mlx4_en_init_netdev(mdev, i, &mdev->profile.prof[i]))
255			mdev->pndev[i] = NULL;
256	}
257
258	/* register notifier */
259	mdev->nb.notifier_call = mlx4_en_netdev_event;
260	if (register_netdevice_notifier(&mdev->nb)) {
261		mdev->nb.notifier_call = NULL;
262		mlx4_err(mdev, "Failed to create notifier\n");
263	}
264}
265
266static void *mlx4_en_add(struct mlx4_dev *dev)
267{
268	struct mlx4_en_dev *mdev;
269	int i;
270
271	printk_once(KERN_INFO "%s", mlx4_en_version);
272
273	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
274	if (!mdev)
275		goto err_free_res;
276
277	if (mlx4_pd_alloc(dev, &mdev->priv_pdn))
278		goto err_free_dev;
279
280	if (mlx4_uar_alloc(dev, &mdev->priv_uar))
281		goto err_pd;
282
283	mdev->uar_map = ioremap((phys_addr_t) mdev->priv_uar.pfn << PAGE_SHIFT,
284				PAGE_SIZE);
285	if (!mdev->uar_map)
286		goto err_uar;
287	spin_lock_init(&mdev->uar_lock);
288
289	mdev->dev = dev;
290	mdev->dma_device = &dev->persist->pdev->dev;
291	mdev->pdev = dev->persist->pdev;
292	mdev->device_up = false;
293
294	mdev->LSO_support = !!(dev->caps.flags & (1 << 15));
295	if (!mdev->LSO_support)
296		mlx4_warn(mdev, "LSO not supported, please upgrade to later FW version to enable LSO\n");
297
298	if (mlx4_mr_alloc(mdev->dev, mdev->priv_pdn, 0, ~0ull,
299			 MLX4_PERM_LOCAL_WRITE |  MLX4_PERM_LOCAL_READ,
300			 0, 0, &mdev->mr)) {
301		mlx4_err(mdev, "Failed allocating memory region\n");
302		goto err_map;
303	}
304	if (mlx4_mr_enable(mdev->dev, &mdev->mr)) {
305		mlx4_err(mdev, "Failed enabling memory region\n");
306		goto err_mr;
307	}
308
309	/* Build device profile according to supplied module parameters */
310	if (mlx4_en_get_profile(mdev)) {
311		mlx4_err(mdev, "Bad module parameters, aborting\n");
312		goto err_mr;
313	}
314
315	/* Configure which ports to start according to module parameters */
316	mdev->port_cnt = 0;
317	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
318		mdev->port_cnt++;
319
320	/* Set default number of RX rings*/
321	mlx4_en_set_num_rx_rings(mdev);
322
323	/* Create our own workqueue for reset/multicast tasks
324	 * Note: we cannot use the shared workqueue because of deadlocks caused
325	 *       by the rtnl lock */
326	mdev->workqueue = create_singlethread_workqueue("mlx4_en");
327	if (!mdev->workqueue)
328		goto err_mr;
329
330	/* At this stage all non-port specific tasks are complete:
331	 * mark the card state as up */
332	mutex_init(&mdev->state_lock);
333	mdev->device_up = true;
334
335	return mdev;
336
337err_mr:
338	(void) mlx4_mr_free(dev, &mdev->mr);
339err_map:
340	if (mdev->uar_map)
341		iounmap(mdev->uar_map);
342err_uar:
343	mlx4_uar_free(dev, &mdev->priv_uar);
344err_pd:
345	mlx4_pd_free(dev, mdev->priv_pdn);
346err_free_dev:
347	kfree(mdev);
348err_free_res:
349	return NULL;
350}
351
352static struct mlx4_interface mlx4_en_interface = {
353	.add		= mlx4_en_add,
354	.remove		= mlx4_en_remove,
355	.event		= mlx4_en_event,
356	.get_dev	= mlx4_en_get_netdev,
357	.protocol	= MLX4_PROT_ETH,
358	.activate	= mlx4_en_activate,
359};
360
361static void mlx4_en_verify_params(void)
362{
363	if (pfctx > MAX_PFC_TX) {
364		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",
365			pfctx, MAX_PFC_TX);
366		pfctx = 0;
367	}
368
369	if (pfcrx > MAX_PFC_RX) {
370		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",
371			pfcrx, MAX_PFC_RX);
372		pfcrx = 0;
373	}
374
375	if (inline_thold < MIN_PKT_LEN || inline_thold > MAX_INLINE) {
376		pr_warn("mlx4_en: WARNING: illegal module parameter inline_thold %d - should be in range %d-%d, will be changed to default (%d)\n",
377			inline_thold, MIN_PKT_LEN, MAX_INLINE, MAX_INLINE);
378		inline_thold = MAX_INLINE;
379	}
380}
381
382static int __init mlx4_en_init(void)
383{
384	mlx4_en_verify_params();
385
386	return mlx4_register_interface(&mlx4_en_interface);
387}
388
389static void __exit mlx4_en_cleanup(void)
390{
391	mlx4_unregister_interface(&mlx4_en_interface);
392}
393
394module_init(mlx4_en_init);
395module_exit(mlx4_en_cleanup);
396
397