1 /* This file is part of the Emulex RoCE Device Driver for
2  * RoCE (RDMA over Converged Ethernet) adapters.
3  * Copyright (C) 2012-2015 Emulex. All rights reserved.
4  * EMULEX and SLI are trademarks of Emulex.
5  * www.emulex.com
6  *
7  * This software is available to you under a choice of one of two licenses.
8  * You may choose to be licensed under the terms of the GNU General Public
9  * License (GPL) Version 2, available from the file COPYING in the main
10  * directory of this source tree, or the BSD license below:
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  *
16  * - Redistributions of source code must retain the above copyright notice,
17  *   this list of conditions and the following disclaimer.
18  *
19  * - Redistributions in binary form must reproduce the above copyright
20  *   notice, this list of conditions and the following disclaimer in
21  *   the documentation and/or other materials provided with the distribution.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
27  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  *
35  * Contact Information:
36  * linux-drivers@emulex.com
37  *
38  * Emulex
39  * 3333 Susan Street
40  * Costa Mesa, CA 92626
41  */
42 
43 #include <linux/module.h>
44 #include <linux/idr.h>
45 #include <rdma/ib_verbs.h>
46 #include <rdma/ib_user_verbs.h>
47 #include <rdma/ib_addr.h>
48 #include <rdma/ib_mad.h>
49 
50 #include <linux/netdevice.h>
51 #include <net/addrconf.h>
52 
53 #include "ocrdma.h"
54 #include "ocrdma_verbs.h"
55 #include "ocrdma_ah.h"
56 #include "be_roce.h"
57 #include "ocrdma_hw.h"
58 #include "ocrdma_stats.h"
59 #include "ocrdma_abi.h"
60 
61 MODULE_VERSION(OCRDMA_ROCE_DRV_VERSION);
62 MODULE_DESCRIPTION(OCRDMA_ROCE_DRV_DESC " " OCRDMA_ROCE_DRV_VERSION);
63 MODULE_AUTHOR("Emulex Corporation");
64 MODULE_LICENSE("Dual BSD/GPL");
65 
66 static DEFINE_IDR(ocrdma_dev_id);
67 
68 void ocrdma_get_guid(struct ocrdma_dev *dev, u8 *guid)
69 {
70 	u8 mac_addr[6];
71 
72 	memcpy(&mac_addr[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
73 	guid[0] = mac_addr[0] ^ 2;
74 	guid[1] = mac_addr[1];
75 	guid[2] = mac_addr[2];
76 	guid[3] = 0xff;
77 	guid[4] = 0xfe;
78 	guid[5] = mac_addr[3];
79 	guid[6] = mac_addr[4];
80 	guid[7] = mac_addr[5];
81 }
82 static enum rdma_link_layer ocrdma_link_layer(struct ib_device *device,
83 					      u8 port_num)
84 {
85 	return IB_LINK_LAYER_ETHERNET;
86 }
87 
88 static int ocrdma_port_immutable(struct ib_device *ibdev, u8 port_num,
89 			         struct ib_port_immutable *immutable)
90 {
91 	struct ib_port_attr attr;
92 	struct ocrdma_dev *dev;
93 	int err;
94 
95 	dev = get_ocrdma_dev(ibdev);
96 	err = ocrdma_query_port(ibdev, port_num, &attr);
97 	if (err)
98 		return err;
99 
100 	immutable->pkey_tbl_len = attr.pkey_tbl_len;
101 	immutable->gid_tbl_len = attr.gid_tbl_len;
102 	immutable->core_cap_flags = RDMA_CORE_PORT_IBA_ROCE;
103 	if (ocrdma_is_udp_encap_supported(dev))
104 		immutable->core_cap_flags |= RDMA_CORE_CAP_PROT_ROCE_UDP_ENCAP;
105 	immutable->max_mad_size = IB_MGMT_MAD_SIZE;
106 
107 	return 0;
108 }
109 
110 static int ocrdma_register_device(struct ocrdma_dev *dev)
111 {
112 	strlcpy(dev->ibdev.name, "ocrdma%d", IB_DEVICE_NAME_MAX);
113 	ocrdma_get_guid(dev, (u8 *)&dev->ibdev.node_guid);
114 	memcpy(dev->ibdev.node_desc, OCRDMA_NODE_DESC,
115 	       sizeof(OCRDMA_NODE_DESC));
116 	dev->ibdev.owner = THIS_MODULE;
117 	dev->ibdev.uverbs_abi_ver = OCRDMA_ABI_VERSION;
118 	dev->ibdev.uverbs_cmd_mask =
119 	    OCRDMA_UVERBS(GET_CONTEXT) |
120 	    OCRDMA_UVERBS(QUERY_DEVICE) |
121 	    OCRDMA_UVERBS(QUERY_PORT) |
122 	    OCRDMA_UVERBS(ALLOC_PD) |
123 	    OCRDMA_UVERBS(DEALLOC_PD) |
124 	    OCRDMA_UVERBS(REG_MR) |
125 	    OCRDMA_UVERBS(DEREG_MR) |
126 	    OCRDMA_UVERBS(CREATE_COMP_CHANNEL) |
127 	    OCRDMA_UVERBS(CREATE_CQ) |
128 	    OCRDMA_UVERBS(RESIZE_CQ) |
129 	    OCRDMA_UVERBS(DESTROY_CQ) |
130 	    OCRDMA_UVERBS(REQ_NOTIFY_CQ) |
131 	    OCRDMA_UVERBS(CREATE_QP) |
132 	    OCRDMA_UVERBS(MODIFY_QP) |
133 	    OCRDMA_UVERBS(QUERY_QP) |
134 	    OCRDMA_UVERBS(DESTROY_QP) |
135 	    OCRDMA_UVERBS(POLL_CQ) |
136 	    OCRDMA_UVERBS(POST_SEND) |
137 	    OCRDMA_UVERBS(POST_RECV);
138 
139 	dev->ibdev.uverbs_cmd_mask |=
140 	    OCRDMA_UVERBS(CREATE_AH) |
141 	     OCRDMA_UVERBS(MODIFY_AH) |
142 	     OCRDMA_UVERBS(QUERY_AH) |
143 	     OCRDMA_UVERBS(DESTROY_AH);
144 
145 	dev->ibdev.node_type = RDMA_NODE_IB_CA;
146 	dev->ibdev.phys_port_cnt = 1;
147 	dev->ibdev.num_comp_vectors = dev->eq_cnt;
148 
149 	/* mandatory verbs. */
150 	dev->ibdev.query_device = ocrdma_query_device;
151 	dev->ibdev.query_port = ocrdma_query_port;
152 	dev->ibdev.modify_port = ocrdma_modify_port;
153 	dev->ibdev.query_gid = ocrdma_query_gid;
154 	dev->ibdev.get_netdev = ocrdma_get_netdev;
155 	dev->ibdev.add_gid = ocrdma_add_gid;
156 	dev->ibdev.del_gid = ocrdma_del_gid;
157 	dev->ibdev.get_link_layer = ocrdma_link_layer;
158 	dev->ibdev.alloc_pd = ocrdma_alloc_pd;
159 	dev->ibdev.dealloc_pd = ocrdma_dealloc_pd;
160 
161 	dev->ibdev.create_cq = ocrdma_create_cq;
162 	dev->ibdev.destroy_cq = ocrdma_destroy_cq;
163 	dev->ibdev.resize_cq = ocrdma_resize_cq;
164 
165 	dev->ibdev.create_qp = ocrdma_create_qp;
166 	dev->ibdev.modify_qp = ocrdma_modify_qp;
167 	dev->ibdev.query_qp = ocrdma_query_qp;
168 	dev->ibdev.destroy_qp = ocrdma_destroy_qp;
169 
170 	dev->ibdev.query_pkey = ocrdma_query_pkey;
171 	dev->ibdev.create_ah = ocrdma_create_ah;
172 	dev->ibdev.destroy_ah = ocrdma_destroy_ah;
173 	dev->ibdev.query_ah = ocrdma_query_ah;
174 	dev->ibdev.modify_ah = ocrdma_modify_ah;
175 
176 	dev->ibdev.poll_cq = ocrdma_poll_cq;
177 	dev->ibdev.post_send = ocrdma_post_send;
178 	dev->ibdev.post_recv = ocrdma_post_recv;
179 	dev->ibdev.req_notify_cq = ocrdma_arm_cq;
180 
181 	dev->ibdev.get_dma_mr = ocrdma_get_dma_mr;
182 	dev->ibdev.dereg_mr = ocrdma_dereg_mr;
183 	dev->ibdev.reg_user_mr = ocrdma_reg_user_mr;
184 
185 	dev->ibdev.alloc_mr = ocrdma_alloc_mr;
186 	dev->ibdev.map_mr_sg = ocrdma_map_mr_sg;
187 
188 	/* mandatory to support user space verbs consumer. */
189 	dev->ibdev.alloc_ucontext = ocrdma_alloc_ucontext;
190 	dev->ibdev.dealloc_ucontext = ocrdma_dealloc_ucontext;
191 	dev->ibdev.mmap = ocrdma_mmap;
192 	dev->ibdev.dma_device = &dev->nic_info.pdev->dev;
193 
194 	dev->ibdev.process_mad = ocrdma_process_mad;
195 	dev->ibdev.get_port_immutable = ocrdma_port_immutable;
196 
197 	if (ocrdma_get_asic_type(dev) == OCRDMA_ASIC_GEN_SKH_R) {
198 		dev->ibdev.uverbs_cmd_mask |=
199 		     OCRDMA_UVERBS(CREATE_SRQ) |
200 		     OCRDMA_UVERBS(MODIFY_SRQ) |
201 		     OCRDMA_UVERBS(QUERY_SRQ) |
202 		     OCRDMA_UVERBS(DESTROY_SRQ) |
203 		     OCRDMA_UVERBS(POST_SRQ_RECV);
204 
205 		dev->ibdev.create_srq = ocrdma_create_srq;
206 		dev->ibdev.modify_srq = ocrdma_modify_srq;
207 		dev->ibdev.query_srq = ocrdma_query_srq;
208 		dev->ibdev.destroy_srq = ocrdma_destroy_srq;
209 		dev->ibdev.post_srq_recv = ocrdma_post_srq_recv;
210 	}
211 	return ib_register_device(&dev->ibdev, NULL);
212 }
213 
214 static int ocrdma_alloc_resources(struct ocrdma_dev *dev)
215 {
216 	mutex_init(&dev->dev_lock);
217 	dev->cq_tbl = kzalloc(sizeof(struct ocrdma_cq *) *
218 			      OCRDMA_MAX_CQ, GFP_KERNEL);
219 	if (!dev->cq_tbl)
220 		goto alloc_err;
221 
222 	if (dev->attr.max_qp) {
223 		dev->qp_tbl = kzalloc(sizeof(struct ocrdma_qp *) *
224 				      OCRDMA_MAX_QP, GFP_KERNEL);
225 		if (!dev->qp_tbl)
226 			goto alloc_err;
227 	}
228 
229 	dev->stag_arr = kzalloc(sizeof(u64) * OCRDMA_MAX_STAG, GFP_KERNEL);
230 	if (dev->stag_arr == NULL)
231 		goto alloc_err;
232 
233 	ocrdma_alloc_pd_pool(dev);
234 
235 	if (!ocrdma_alloc_stats_resources(dev)) {
236 		pr_err("%s: stats resource allocation failed\n", __func__);
237 		goto alloc_err;
238 	}
239 
240 	spin_lock_init(&dev->av_tbl.lock);
241 	spin_lock_init(&dev->flush_q_lock);
242 	return 0;
243 alloc_err:
244 	pr_err("%s(%d) error.\n", __func__, dev->id);
245 	return -ENOMEM;
246 }
247 
248 static void ocrdma_free_resources(struct ocrdma_dev *dev)
249 {
250 	ocrdma_release_stats_resources(dev);
251 	kfree(dev->stag_arr);
252 	kfree(dev->qp_tbl);
253 	kfree(dev->cq_tbl);
254 }
255 
256 /* OCRDMA sysfs interface */
257 static ssize_t show_rev(struct device *device, struct device_attribute *attr,
258 			char *buf)
259 {
260 	struct ocrdma_dev *dev = dev_get_drvdata(device);
261 
262 	return scnprintf(buf, PAGE_SIZE, "0x%x\n", dev->nic_info.pdev->vendor);
263 }
264 
265 static ssize_t show_fw_ver(struct device *device, struct device_attribute *attr,
266 			char *buf)
267 {
268 	struct ocrdma_dev *dev = dev_get_drvdata(device);
269 
270 	return scnprintf(buf, PAGE_SIZE, "%s\n", &dev->attr.fw_ver[0]);
271 }
272 
273 static ssize_t show_hca_type(struct device *device,
274 			     struct device_attribute *attr, char *buf)
275 {
276 	struct ocrdma_dev *dev = dev_get_drvdata(device);
277 
278 	return scnprintf(buf, PAGE_SIZE, "%s\n", &dev->model_number[0]);
279 }
280 
281 static DEVICE_ATTR(hw_rev, S_IRUGO, show_rev, NULL);
282 static DEVICE_ATTR(fw_ver, S_IRUGO, show_fw_ver, NULL);
283 static DEVICE_ATTR(hca_type, S_IRUGO, show_hca_type, NULL);
284 
285 static struct device_attribute *ocrdma_attributes[] = {
286 	&dev_attr_hw_rev,
287 	&dev_attr_fw_ver,
288 	&dev_attr_hca_type
289 };
290 
291 static void ocrdma_remove_sysfiles(struct ocrdma_dev *dev)
292 {
293 	int i;
294 
295 	for (i = 0; i < ARRAY_SIZE(ocrdma_attributes); i++)
296 		device_remove_file(&dev->ibdev.dev, ocrdma_attributes[i]);
297 }
298 
299 static struct ocrdma_dev *ocrdma_add(struct be_dev_info *dev_info)
300 {
301 	int status = 0, i;
302 	u8 lstate = 0;
303 	struct ocrdma_dev *dev;
304 
305 	dev = (struct ocrdma_dev *)ib_alloc_device(sizeof(struct ocrdma_dev));
306 	if (!dev) {
307 		pr_err("Unable to allocate ib device\n");
308 		return NULL;
309 	}
310 	dev->mbx_cmd = kzalloc(sizeof(struct ocrdma_mqe_emb_cmd), GFP_KERNEL);
311 	if (!dev->mbx_cmd)
312 		goto idr_err;
313 
314 	memcpy(&dev->nic_info, dev_info, sizeof(*dev_info));
315 	dev->id = idr_alloc(&ocrdma_dev_id, NULL, 0, 0, GFP_KERNEL);
316 	if (dev->id < 0)
317 		goto idr_err;
318 
319 	status = ocrdma_init_hw(dev);
320 	if (status)
321 		goto init_err;
322 
323 	status = ocrdma_alloc_resources(dev);
324 	if (status)
325 		goto alloc_err;
326 
327 	ocrdma_init_service_level(dev);
328 	status = ocrdma_register_device(dev);
329 	if (status)
330 		goto alloc_err;
331 
332 	/* Query Link state and update */
333 	status = ocrdma_mbx_get_link_speed(dev, NULL, &lstate);
334 	if (!status)
335 		ocrdma_update_link_state(dev, lstate);
336 
337 	for (i = 0; i < ARRAY_SIZE(ocrdma_attributes); i++)
338 		if (device_create_file(&dev->ibdev.dev, ocrdma_attributes[i]))
339 			goto sysfs_err;
340 	/* Init stats */
341 	ocrdma_add_port_stats(dev);
342 	/* Interrupt Moderation */
343 	INIT_DELAYED_WORK(&dev->eqd_work, ocrdma_eqd_set_task);
344 	schedule_delayed_work(&dev->eqd_work, msecs_to_jiffies(1000));
345 
346 	pr_info("%s %s: %s \"%s\" port %d\n",
347 		dev_name(&dev->nic_info.pdev->dev), hca_name(dev),
348 		port_speed_string(dev), dev->model_number,
349 		dev->hba_port_num);
350 	pr_info("%s ocrdma%d driver loaded successfully\n",
351 		dev_name(&dev->nic_info.pdev->dev), dev->id);
352 	return dev;
353 
354 sysfs_err:
355 	ocrdma_remove_sysfiles(dev);
356 alloc_err:
357 	ocrdma_free_resources(dev);
358 	ocrdma_cleanup_hw(dev);
359 init_err:
360 	idr_remove(&ocrdma_dev_id, dev->id);
361 idr_err:
362 	kfree(dev->mbx_cmd);
363 	ib_dealloc_device(&dev->ibdev);
364 	pr_err("%s() leaving. ret=%d\n", __func__, status);
365 	return NULL;
366 }
367 
368 static void ocrdma_remove_free(struct ocrdma_dev *dev)
369 {
370 
371 	idr_remove(&ocrdma_dev_id, dev->id);
372 	kfree(dev->mbx_cmd);
373 	ib_dealloc_device(&dev->ibdev);
374 }
375 
376 static void ocrdma_remove(struct ocrdma_dev *dev)
377 {
378 	/* first unregister with stack to stop all the active traffic
379 	 * of the registered clients.
380 	 */
381 	cancel_delayed_work_sync(&dev->eqd_work);
382 	ocrdma_remove_sysfiles(dev);
383 	ib_unregister_device(&dev->ibdev);
384 
385 	ocrdma_rem_port_stats(dev);
386 	ocrdma_free_resources(dev);
387 	ocrdma_cleanup_hw(dev);
388 	ocrdma_remove_free(dev);
389 }
390 
391 static int ocrdma_dispatch_port_active(struct ocrdma_dev *dev)
392 {
393 	struct ib_event port_event;
394 
395 	port_event.event = IB_EVENT_PORT_ACTIVE;
396 	port_event.element.port_num = 1;
397 	port_event.device = &dev->ibdev;
398 	ib_dispatch_event(&port_event);
399 	return 0;
400 }
401 
402 static int ocrdma_dispatch_port_error(struct ocrdma_dev *dev)
403 {
404 	struct ib_event err_event;
405 
406 	err_event.event = IB_EVENT_PORT_ERR;
407 	err_event.element.port_num = 1;
408 	err_event.device = &dev->ibdev;
409 	ib_dispatch_event(&err_event);
410 	return 0;
411 }
412 
413 static void ocrdma_shutdown(struct ocrdma_dev *dev)
414 {
415 	ocrdma_dispatch_port_error(dev);
416 	ocrdma_remove(dev);
417 }
418 
419 /* event handling via NIC driver ensures that all the NIC specific
420  * initialization done before RoCE driver notifies
421  * event to stack.
422  */
423 static void ocrdma_event_handler(struct ocrdma_dev *dev, u32 event)
424 {
425 	switch (event) {
426 	case BE_DEV_SHUTDOWN:
427 		ocrdma_shutdown(dev);
428 		break;
429 	default:
430 		break;
431 	}
432 }
433 
434 void ocrdma_update_link_state(struct ocrdma_dev *dev, u8 lstate)
435 {
436 	if (!(dev->flags & OCRDMA_FLAGS_LINK_STATUS_INIT)) {
437 		dev->flags |= OCRDMA_FLAGS_LINK_STATUS_INIT;
438 		if (!lstate)
439 			return;
440 	}
441 
442 	if (!lstate)
443 		ocrdma_dispatch_port_error(dev);
444 	else
445 		ocrdma_dispatch_port_active(dev);
446 }
447 
448 static struct ocrdma_driver ocrdma_drv = {
449 	.name			= "ocrdma_driver",
450 	.add			= ocrdma_add,
451 	.remove			= ocrdma_remove,
452 	.state_change_handler	= ocrdma_event_handler,
453 	.be_abi_version		= OCRDMA_BE_ROCE_ABI_VERSION,
454 };
455 
456 static int __init ocrdma_init_module(void)
457 {
458 	int status;
459 
460 	ocrdma_init_debugfs();
461 
462 	status = be_roce_register_driver(&ocrdma_drv);
463 	if (status)
464 		goto err_be_reg;
465 
466 	return 0;
467 
468 err_be_reg:
469 
470 	return status;
471 }
472 
473 static void __exit ocrdma_exit_module(void)
474 {
475 	be_roce_unregister_driver(&ocrdma_drv);
476 	ocrdma_rem_debugfs();
477 	idr_destroy(&ocrdma_dev_id);
478 }
479 
480 module_init(ocrdma_init_module);
481 module_exit(ocrdma_exit_module);
482