1/*
2 * Copyright (c) 2007, 2014 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#define	LINUXKPI_PARAM_PREFIX mlx4_
35
36#include <linux/module.h>
37#include <linux/delay.h>
38#include <linux/netdevice.h>
39#include <linux/slab.h>
40
41#include <dev/mlx4/driver.h>
42#include <dev/mlx4/device.h>
43#include <dev/mlx4/cmd.h>
44
45#include "en.h"
46
47/* Mellanox ConnectX HCA Ethernet driver */
48
49#define MLX4_EN_PARM_INT(X, def_val, desc) \
50	static unsigned int X = def_val;\
51	module_param(X , uint, 0444); \
52	MODULE_PARM_DESC(X, desc);
53
54
55/*
56 * Device scope module parameters
57 */
58
59/* Enable RSS UDP traffic */
60MLX4_EN_PARM_INT(udp_rss, 1,
61		 "Enable RSS for incoming UDP traffic or disabled (0)");
62
63/* Priority pausing */
64MLX4_EN_PARM_INT(pfctx, 0, "Priority based Flow Control policy on TX[7:0]."
65			   " Per priority bit mask");
66MLX4_EN_PARM_INT(pfcrx, 0, "Priority based Flow Control policy on RX[7:0]."
67			   " Per priority bit mask");
68
69MLX4_EN_PARM_INT(inline_thold, MAX_INLINE,
70		 "Threshold for using inline data (range: 17-104, default: 104)");
71
72#define MAX_PFC_TX     0xff
73#define MAX_PFC_RX     0xff
74
75static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
76{
77	struct mlx4_en_profile *params = &mdev->profile;
78	int i;
79
80	params->udp_rss = udp_rss;
81	params->num_tx_rings_p_up = min_t(int, mp_ncpus,
82			MLX4_EN_MAX_TX_RING_P_UP);
83	if (params->udp_rss && !(mdev->dev->caps.flags
84					& MLX4_DEV_CAP_FLAG_UDP_RSS)) {
85		mlx4_warn(mdev, "UDP RSS is not supported on this device.\n");
86		params->udp_rss = 0;
87	}
88	for (i = 1; i <= MLX4_MAX_PORTS; i++) {
89		params->prof[i].rx_pause = 1;
90		params->prof[i].rx_ppp = pfcrx;
91		params->prof[i].tx_pause = 1;
92		params->prof[i].tx_ppp = pfctx;
93		params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE;
94		params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
95		params->prof[i].tx_ring_num = params->num_tx_rings_p_up *
96			MLX4_EN_NUM_UP;
97		params->prof[i].rss_rings = 0;
98		params->prof[i].inline_thold = inline_thold;
99	}
100
101	return 0;
102}
103
104static void *mlx4_en_get_netdev(struct mlx4_dev *dev, void *ctx, u8 port)
105{
106	struct mlx4_en_dev *endev = ctx;
107
108	return endev->pndev[port];
109}
110
111static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr,
112			  enum mlx4_dev_event event, unsigned long port)
113{
114	struct mlx4_en_dev *mdev = (struct mlx4_en_dev *) endev_ptr;
115	struct mlx4_en_priv *priv;
116
117	switch (event) {
118	case MLX4_DEV_EVENT_PORT_UP:
119	case MLX4_DEV_EVENT_PORT_DOWN:
120		if (!mdev->pndev[port])
121			return;
122		priv = netdev_priv(mdev->pndev[port]);
123		/* To prevent races, we poll the link state in a separate
124		  task rather than changing it here */
125		priv->link_state = event;
126		queue_work(mdev->workqueue, &priv->linkstate_task);
127		break;
128
129	case MLX4_DEV_EVENT_CATASTROPHIC_ERROR:
130		mlx4_err(mdev, "Internal error detected, restarting device\n");
131		break;
132
133	case MLX4_DEV_EVENT_SLAVE_INIT:
134	case MLX4_DEV_EVENT_SLAVE_SHUTDOWN:
135		break;
136	default:
137		if (port < 1 || port > dev->caps.num_ports ||
138		    !mdev->pndev[port])
139			return;
140		mlx4_warn(mdev, "Unhandled event %d for port %d\n", event,
141			  (int) port);
142	}
143}
144
145static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
146{
147	struct mlx4_en_dev *mdev = endev_ptr;
148	int i;
149
150	mutex_lock(&mdev->state_lock);
151	mdev->device_up = false;
152	mutex_unlock(&mdev->state_lock);
153
154	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
155		if (mdev->pndev[i])
156			mlx4_en_destroy_netdev(mdev->pndev[i]);
157
158	flush_workqueue(mdev->workqueue);
159	destroy_workqueue(mdev->workqueue);
160	(void) mlx4_mr_free(dev, &mdev->mr);
161	iounmap(mdev->uar_map);
162	mlx4_uar_free(dev, &mdev->priv_uar);
163	mlx4_pd_free(dev, mdev->priv_pdn);
164	kfree(mdev);
165}
166
167static void mlx4_en_activate(struct mlx4_dev *dev, void *ctx)
168{
169	int i;
170	struct mlx4_en_dev *mdev = ctx;
171
172	/* Create a netdev for each port */
173	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
174		mlx4_info(mdev, "Activating port:%d\n", i);
175		if (mlx4_en_init_netdev(mdev, i, &mdev->profile.prof[i]))
176			mdev->pndev[i] = NULL;
177	}
178}
179
180static void *mlx4_en_add(struct mlx4_dev *dev)
181{
182	struct mlx4_en_dev *mdev;
183	int i;
184
185	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
186	if (!mdev)
187		goto err_free_res;
188
189	if (mlx4_pd_alloc(dev, &mdev->priv_pdn))
190		goto err_free_dev;
191
192	if (mlx4_uar_alloc(dev, &mdev->priv_uar))
193		goto err_pd;
194
195	mdev->uar_map = ioremap((phys_addr_t) mdev->priv_uar.pfn << PAGE_SHIFT,
196				PAGE_SIZE);
197	if (!mdev->uar_map)
198		goto err_uar;
199	spin_lock_init(&mdev->uar_lock);
200
201	mdev->dev = dev;
202	mdev->dma_device = &dev->persist->pdev->dev;
203	mdev->pdev = dev->persist->pdev;
204	mdev->device_up = false;
205
206	mdev->LSO_support = !!(dev->caps.flags & (1 << 15));
207	if (!mdev->LSO_support)
208		mlx4_warn(mdev, "LSO not supported, please upgrade to later "
209				"FW version to enable LSO\n");
210
211	if (mlx4_mr_alloc(mdev->dev, mdev->priv_pdn, 0, ~0ull,
212			 MLX4_PERM_LOCAL_WRITE |  MLX4_PERM_LOCAL_READ,
213			 0, 0, &mdev->mr)) {
214		mlx4_err(mdev, "Failed allocating memory region\n");
215		goto err_map;
216	}
217	if (mlx4_mr_enable(mdev->dev, &mdev->mr)) {
218		mlx4_err(mdev, "Failed enabling memory region\n");
219		goto err_mr;
220	}
221
222	/* Build device profile according to supplied module parameters */
223	if (mlx4_en_get_profile(mdev)) {
224		mlx4_err(mdev, "Bad module parameters, aborting\n");
225		goto err_mr;
226	}
227
228	/* Configure which ports to start according to module parameters */
229	mdev->port_cnt = 0;
230	mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
231		mdev->port_cnt++;
232
233	/* Set default number of RX rings*/
234	mlx4_en_set_num_rx_rings(mdev);
235
236	/* Create our own workqueue for reset/multicast tasks
237	 * Note: we cannot use the shared workqueue because of deadlocks caused
238	 *       by the rtnl lock */
239	mdev->workqueue = create_singlethread_workqueue("mlx4_en");
240	if (!mdev->workqueue)
241		goto err_mr;
242
243	/* At this stage all non-port specific tasks are complete:
244	 * mark the card state as up */
245	mutex_init(&mdev->state_lock);
246	mdev->device_up = true;
247
248	return mdev;
249
250err_mr:
251	(void) mlx4_mr_free(dev, &mdev->mr);
252err_map:
253	if (mdev->uar_map)
254		iounmap(mdev->uar_map);
255err_uar:
256	mlx4_uar_free(dev, &mdev->priv_uar);
257err_pd:
258	mlx4_pd_free(dev, mdev->priv_pdn);
259err_free_dev:
260	kfree(mdev);
261err_free_res:
262	return NULL;
263}
264
265static struct mlx4_interface mlx4_en_interface = {
266	.add		= mlx4_en_add,
267	.remove		= mlx4_en_remove,
268	.event		= mlx4_en_event,
269	.get_dev	= mlx4_en_get_netdev,
270	.protocol	= MLX4_PROT_ETH,
271	.activate	= mlx4_en_activate,
272};
273
274static void mlx4_en_verify_params(void)
275{
276	if (pfctx > MAX_PFC_TX) {
277		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",
278			pfctx, MAX_PFC_TX);
279		pfctx = 0;
280	}
281
282	if (pfcrx > MAX_PFC_RX) {
283		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",
284			pfcrx, MAX_PFC_RX);
285		pfcrx = 0;
286	}
287
288	if (inline_thold < MIN_PKT_LEN || inline_thold > MAX_INLINE) {
289		pr_warn("mlx4_en: WARNING: illegal module parameter inline_thold %d - should be in range %d-%d, will be changed to default (%d)\n",
290			inline_thold, MIN_PKT_LEN, MAX_INLINE, MAX_INLINE);
291		inline_thold = MAX_INLINE;
292	}
293}
294
295static int __init mlx4_en_init(void)
296{
297	mlx4_en_verify_params();
298
299	return mlx4_register_interface(&mlx4_en_interface);
300}
301
302static void __exit mlx4_en_cleanup(void)
303{
304	mlx4_unregister_interface(&mlx4_en_interface);
305}
306
307module_init_order(mlx4_en_init, SI_ORDER_SIXTH);
308module_exit_order(mlx4_en_cleanup, SI_ORDER_SIXTH);
309
310static int
311mlx4en_evhand(module_t mod, int event, void *arg)
312{
313        return (0);
314}
315static moduledata_t mlx4en_mod = {
316        .name = "mlx4en",
317	.evhand = mlx4en_evhand,
318};
319DECLARE_MODULE(mlx4en, mlx4en_mod, SI_SUB_OFED_PREINIT, SI_ORDER_ANY);
320MODULE_DEPEND(mlx4en, mlx4, 1, 1, 1);
321MODULE_DEPEND(mlx4en, linuxkpi, 1, 1, 1);
322