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 <rdma/ocrdma-abi.h>
60 
61 MODULE_DESCRIPTION(OCRDMA_ROCE_DRV_DESC " " OCRDMA_ROCE_DRV_VERSION);
62 MODULE_AUTHOR("Emulex Corporation");
63 MODULE_LICENSE("Dual BSD/GPL");
64 
65 static DEFINE_IDR(ocrdma_dev_id);
66 
67 void ocrdma_get_guid(struct ocrdma_dev *dev, u8 *guid)
68 {
69 	u8 mac_addr[6];
70 
71 	memcpy(&mac_addr[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
72 	guid[0] = mac_addr[0] ^ 2;
73 	guid[1] = mac_addr[1];
74 	guid[2] = mac_addr[2];
75 	guid[3] = 0xff;
76 	guid[4] = 0xfe;
77 	guid[5] = mac_addr[3];
78 	guid[6] = mac_addr[4];
79 	guid[7] = mac_addr[5];
80 }
81 static enum rdma_link_layer ocrdma_link_layer(struct ib_device *device,
82 					      u8 port_num)
83 {
84 	return IB_LINK_LAYER_ETHERNET;
85 }
86 
87 static int ocrdma_port_immutable(struct ib_device *ibdev, u8 port_num,
88 			         struct ib_port_immutable *immutable)
89 {
90 	struct ib_port_attr attr;
91 	struct ocrdma_dev *dev;
92 	int err;
93 
94 	dev = get_ocrdma_dev(ibdev);
95 	immutable->core_cap_flags = RDMA_CORE_PORT_IBA_ROCE;
96 	if (ocrdma_is_udp_encap_supported(dev))
97 		immutable->core_cap_flags |= RDMA_CORE_CAP_PROT_ROCE_UDP_ENCAP;
98 
99 	err = ib_query_port(ibdev, port_num, &attr);
100 	if (err)
101 		return err;
102 
103 	immutable->pkey_tbl_len = attr.pkey_tbl_len;
104 	immutable->gid_tbl_len = attr.gid_tbl_len;
105 	immutable->max_mad_size = IB_MGMT_MAD_SIZE;
106 
107 	return 0;
108 }
109 
110 static void get_dev_fw_str(struct ib_device *device, char *str)
111 {
112 	struct ocrdma_dev *dev = get_ocrdma_dev(device);
113 
114 	snprintf(str, IB_FW_VERSION_NAME_MAX, "%s", &dev->attr.fw_ver[0]);
115 }
116 
117 static int ocrdma_register_device(struct ocrdma_dev *dev)
118 {
119 	strlcpy(dev->ibdev.name, "ocrdma%d", IB_DEVICE_NAME_MAX);
120 	ocrdma_get_guid(dev, (u8 *)&dev->ibdev.node_guid);
121 	BUILD_BUG_ON(sizeof(OCRDMA_NODE_DESC) > IB_DEVICE_NODE_DESC_MAX);
122 	memcpy(dev->ibdev.node_desc, OCRDMA_NODE_DESC,
123 	       sizeof(OCRDMA_NODE_DESC));
124 	dev->ibdev.owner = THIS_MODULE;
125 	dev->ibdev.uverbs_abi_ver = OCRDMA_ABI_VERSION;
126 	dev->ibdev.uverbs_cmd_mask =
127 	    OCRDMA_UVERBS(GET_CONTEXT) |
128 	    OCRDMA_UVERBS(QUERY_DEVICE) |
129 	    OCRDMA_UVERBS(QUERY_PORT) |
130 	    OCRDMA_UVERBS(ALLOC_PD) |
131 	    OCRDMA_UVERBS(DEALLOC_PD) |
132 	    OCRDMA_UVERBS(REG_MR) |
133 	    OCRDMA_UVERBS(DEREG_MR) |
134 	    OCRDMA_UVERBS(CREATE_COMP_CHANNEL) |
135 	    OCRDMA_UVERBS(CREATE_CQ) |
136 	    OCRDMA_UVERBS(RESIZE_CQ) |
137 	    OCRDMA_UVERBS(DESTROY_CQ) |
138 	    OCRDMA_UVERBS(REQ_NOTIFY_CQ) |
139 	    OCRDMA_UVERBS(CREATE_QP) |
140 	    OCRDMA_UVERBS(MODIFY_QP) |
141 	    OCRDMA_UVERBS(QUERY_QP) |
142 	    OCRDMA_UVERBS(DESTROY_QP) |
143 	    OCRDMA_UVERBS(POLL_CQ) |
144 	    OCRDMA_UVERBS(POST_SEND) |
145 	    OCRDMA_UVERBS(POST_RECV);
146 
147 	dev->ibdev.uverbs_cmd_mask |=
148 	    OCRDMA_UVERBS(CREATE_AH) |
149 	     OCRDMA_UVERBS(MODIFY_AH) |
150 	     OCRDMA_UVERBS(QUERY_AH) |
151 	     OCRDMA_UVERBS(DESTROY_AH);
152 
153 	dev->ibdev.node_type = RDMA_NODE_IB_CA;
154 	dev->ibdev.phys_port_cnt = 1;
155 	dev->ibdev.num_comp_vectors = dev->eq_cnt;
156 
157 	/* mandatory verbs. */
158 	dev->ibdev.query_device = ocrdma_query_device;
159 	dev->ibdev.query_port = ocrdma_query_port;
160 	dev->ibdev.modify_port = ocrdma_modify_port;
161 	dev->ibdev.get_netdev = ocrdma_get_netdev;
162 	dev->ibdev.get_link_layer = ocrdma_link_layer;
163 	dev->ibdev.alloc_pd = ocrdma_alloc_pd;
164 	dev->ibdev.dealloc_pd = ocrdma_dealloc_pd;
165 
166 	dev->ibdev.create_cq = ocrdma_create_cq;
167 	dev->ibdev.destroy_cq = ocrdma_destroy_cq;
168 	dev->ibdev.resize_cq = ocrdma_resize_cq;
169 
170 	dev->ibdev.create_qp = ocrdma_create_qp;
171 	dev->ibdev.modify_qp = ocrdma_modify_qp;
172 	dev->ibdev.query_qp = ocrdma_query_qp;
173 	dev->ibdev.destroy_qp = ocrdma_destroy_qp;
174 
175 	dev->ibdev.query_pkey = ocrdma_query_pkey;
176 	dev->ibdev.create_ah = ocrdma_create_ah;
177 	dev->ibdev.destroy_ah = ocrdma_destroy_ah;
178 	dev->ibdev.query_ah = ocrdma_query_ah;
179 	dev->ibdev.modify_ah = ocrdma_modify_ah;
180 
181 	dev->ibdev.poll_cq = ocrdma_poll_cq;
182 	dev->ibdev.post_send = ocrdma_post_send;
183 	dev->ibdev.post_recv = ocrdma_post_recv;
184 	dev->ibdev.req_notify_cq = ocrdma_arm_cq;
185 
186 	dev->ibdev.get_dma_mr = ocrdma_get_dma_mr;
187 	dev->ibdev.dereg_mr = ocrdma_dereg_mr;
188 	dev->ibdev.reg_user_mr = ocrdma_reg_user_mr;
189 
190 	dev->ibdev.alloc_mr = ocrdma_alloc_mr;
191 	dev->ibdev.map_mr_sg = ocrdma_map_mr_sg;
192 
193 	/* mandatory to support user space verbs consumer. */
194 	dev->ibdev.alloc_ucontext = ocrdma_alloc_ucontext;
195 	dev->ibdev.dealloc_ucontext = ocrdma_dealloc_ucontext;
196 	dev->ibdev.mmap = ocrdma_mmap;
197 	dev->ibdev.dev.parent = &dev->nic_info.pdev->dev;
198 
199 	dev->ibdev.process_mad = ocrdma_process_mad;
200 	dev->ibdev.get_port_immutable = ocrdma_port_immutable;
201 	dev->ibdev.get_dev_fw_str     = get_dev_fw_str;
202 
203 	if (ocrdma_get_asic_type(dev) == OCRDMA_ASIC_GEN_SKH_R) {
204 		dev->ibdev.uverbs_cmd_mask |=
205 		     OCRDMA_UVERBS(CREATE_SRQ) |
206 		     OCRDMA_UVERBS(MODIFY_SRQ) |
207 		     OCRDMA_UVERBS(QUERY_SRQ) |
208 		     OCRDMA_UVERBS(DESTROY_SRQ) |
209 		     OCRDMA_UVERBS(POST_SRQ_RECV);
210 
211 		dev->ibdev.create_srq = ocrdma_create_srq;
212 		dev->ibdev.modify_srq = ocrdma_modify_srq;
213 		dev->ibdev.query_srq = ocrdma_query_srq;
214 		dev->ibdev.destroy_srq = ocrdma_destroy_srq;
215 		dev->ibdev.post_srq_recv = ocrdma_post_srq_recv;
216 	}
217 	dev->ibdev.driver_id = RDMA_DRIVER_OCRDMA;
218 	return ib_register_device(&dev->ibdev, NULL);
219 }
220 
221 static int ocrdma_alloc_resources(struct ocrdma_dev *dev)
222 {
223 	mutex_init(&dev->dev_lock);
224 	dev->cq_tbl = kzalloc(sizeof(struct ocrdma_cq *) *
225 			      OCRDMA_MAX_CQ, GFP_KERNEL);
226 	if (!dev->cq_tbl)
227 		goto alloc_err;
228 
229 	if (dev->attr.max_qp) {
230 		dev->qp_tbl = kzalloc(sizeof(struct ocrdma_qp *) *
231 				      OCRDMA_MAX_QP, GFP_KERNEL);
232 		if (!dev->qp_tbl)
233 			goto alloc_err;
234 	}
235 
236 	dev->stag_arr = kzalloc(sizeof(u64) * OCRDMA_MAX_STAG, GFP_KERNEL);
237 	if (dev->stag_arr == NULL)
238 		goto alloc_err;
239 
240 	ocrdma_alloc_pd_pool(dev);
241 
242 	if (!ocrdma_alloc_stats_resources(dev)) {
243 		pr_err("%s: stats resource allocation failed\n", __func__);
244 		goto alloc_err;
245 	}
246 
247 	spin_lock_init(&dev->av_tbl.lock);
248 	spin_lock_init(&dev->flush_q_lock);
249 	return 0;
250 alloc_err:
251 	pr_err("%s(%d) error.\n", __func__, dev->id);
252 	return -ENOMEM;
253 }
254 
255 static void ocrdma_free_resources(struct ocrdma_dev *dev)
256 {
257 	ocrdma_release_stats_resources(dev);
258 	kfree(dev->stag_arr);
259 	kfree(dev->qp_tbl);
260 	kfree(dev->cq_tbl);
261 }
262 
263 /* OCRDMA sysfs interface */
264 static ssize_t show_rev(struct device *device, struct device_attribute *attr,
265 			char *buf)
266 {
267 	struct ocrdma_dev *dev = dev_get_drvdata(device);
268 
269 	return scnprintf(buf, PAGE_SIZE, "0x%x\n", dev->nic_info.pdev->vendor);
270 }
271 
272 static ssize_t show_hca_type(struct device *device,
273 			     struct device_attribute *attr, char *buf)
274 {
275 	struct ocrdma_dev *dev = dev_get_drvdata(device);
276 
277 	return scnprintf(buf, PAGE_SIZE, "%s\n", &dev->model_number[0]);
278 }
279 
280 static DEVICE_ATTR(hw_rev, S_IRUGO, show_rev, NULL);
281 static DEVICE_ATTR(hca_type, S_IRUGO, show_hca_type, NULL);
282 
283 static struct device_attribute *ocrdma_attributes[] = {
284 	&dev_attr_hw_rev,
285 	&dev_attr_hca_type
286 };
287 
288 static void ocrdma_remove_sysfiles(struct ocrdma_dev *dev)
289 {
290 	int i;
291 
292 	for (i = 0; i < ARRAY_SIZE(ocrdma_attributes); i++)
293 		device_remove_file(&dev->ibdev.dev, ocrdma_attributes[i]);
294 }
295 
296 static struct ocrdma_dev *ocrdma_add(struct be_dev_info *dev_info)
297 {
298 	int status = 0, i;
299 	u8 lstate = 0;
300 	struct ocrdma_dev *dev;
301 
302 	dev = (struct ocrdma_dev *)ib_alloc_device(sizeof(struct ocrdma_dev));
303 	if (!dev) {
304 		pr_err("Unable to allocate ib device\n");
305 		return NULL;
306 	}
307 	dev->mbx_cmd = kzalloc(sizeof(struct ocrdma_mqe_emb_cmd), GFP_KERNEL);
308 	if (!dev->mbx_cmd)
309 		goto idr_err;
310 
311 	memcpy(&dev->nic_info, dev_info, sizeof(*dev_info));
312 	dev->id = idr_alloc(&ocrdma_dev_id, NULL, 0, 0, GFP_KERNEL);
313 	if (dev->id < 0)
314 		goto idr_err;
315 
316 	status = ocrdma_init_hw(dev);
317 	if (status)
318 		goto init_err;
319 
320 	status = ocrdma_alloc_resources(dev);
321 	if (status)
322 		goto alloc_err;
323 
324 	ocrdma_init_service_level(dev);
325 	status = ocrdma_register_device(dev);
326 	if (status)
327 		goto alloc_err;
328 
329 	/* Query Link state and update */
330 	status = ocrdma_mbx_get_link_speed(dev, NULL, &lstate);
331 	if (!status)
332 		ocrdma_update_link_state(dev, lstate);
333 
334 	for (i = 0; i < ARRAY_SIZE(ocrdma_attributes); i++)
335 		if (device_create_file(&dev->ibdev.dev, ocrdma_attributes[i]))
336 			goto sysfs_err;
337 	/* Init stats */
338 	ocrdma_add_port_stats(dev);
339 	/* Interrupt Moderation */
340 	INIT_DELAYED_WORK(&dev->eqd_work, ocrdma_eqd_set_task);
341 	schedule_delayed_work(&dev->eqd_work, msecs_to_jiffies(1000));
342 
343 	pr_info("%s %s: %s \"%s\" port %d\n",
344 		dev_name(&dev->nic_info.pdev->dev), hca_name(dev),
345 		port_speed_string(dev), dev->model_number,
346 		dev->hba_port_num);
347 	pr_info("%s ocrdma%d driver loaded successfully\n",
348 		dev_name(&dev->nic_info.pdev->dev), dev->id);
349 	return dev;
350 
351 sysfs_err:
352 	ocrdma_remove_sysfiles(dev);
353 alloc_err:
354 	ocrdma_free_resources(dev);
355 	ocrdma_cleanup_hw(dev);
356 init_err:
357 	idr_remove(&ocrdma_dev_id, dev->id);
358 idr_err:
359 	kfree(dev->mbx_cmd);
360 	ib_dealloc_device(&dev->ibdev);
361 	pr_err("%s() leaving. ret=%d\n", __func__, status);
362 	return NULL;
363 }
364 
365 static void ocrdma_remove_free(struct ocrdma_dev *dev)
366 {
367 
368 	idr_remove(&ocrdma_dev_id, dev->id);
369 	kfree(dev->mbx_cmd);
370 	ib_dealloc_device(&dev->ibdev);
371 }
372 
373 static void ocrdma_remove(struct ocrdma_dev *dev)
374 {
375 	/* first unregister with stack to stop all the active traffic
376 	 * of the registered clients.
377 	 */
378 	cancel_delayed_work_sync(&dev->eqd_work);
379 	ocrdma_remove_sysfiles(dev);
380 	ib_unregister_device(&dev->ibdev);
381 
382 	ocrdma_rem_port_stats(dev);
383 	ocrdma_free_resources(dev);
384 	ocrdma_cleanup_hw(dev);
385 	ocrdma_remove_free(dev);
386 }
387 
388 static int ocrdma_dispatch_port_active(struct ocrdma_dev *dev)
389 {
390 	struct ib_event port_event;
391 
392 	port_event.event = IB_EVENT_PORT_ACTIVE;
393 	port_event.element.port_num = 1;
394 	port_event.device = &dev->ibdev;
395 	ib_dispatch_event(&port_event);
396 	return 0;
397 }
398 
399 static int ocrdma_dispatch_port_error(struct ocrdma_dev *dev)
400 {
401 	struct ib_event err_event;
402 
403 	err_event.event = IB_EVENT_PORT_ERR;
404 	err_event.element.port_num = 1;
405 	err_event.device = &dev->ibdev;
406 	ib_dispatch_event(&err_event);
407 	return 0;
408 }
409 
410 static void ocrdma_shutdown(struct ocrdma_dev *dev)
411 {
412 	ocrdma_dispatch_port_error(dev);
413 	ocrdma_remove(dev);
414 }
415 
416 /* event handling via NIC driver ensures that all the NIC specific
417  * initialization done before RoCE driver notifies
418  * event to stack.
419  */
420 static void ocrdma_event_handler(struct ocrdma_dev *dev, u32 event)
421 {
422 	switch (event) {
423 	case BE_DEV_SHUTDOWN:
424 		ocrdma_shutdown(dev);
425 		break;
426 	default:
427 		break;
428 	}
429 }
430 
431 void ocrdma_update_link_state(struct ocrdma_dev *dev, u8 lstate)
432 {
433 	if (!(dev->flags & OCRDMA_FLAGS_LINK_STATUS_INIT)) {
434 		dev->flags |= OCRDMA_FLAGS_LINK_STATUS_INIT;
435 		if (!lstate)
436 			return;
437 	}
438 
439 	if (!lstate)
440 		ocrdma_dispatch_port_error(dev);
441 	else
442 		ocrdma_dispatch_port_active(dev);
443 }
444 
445 static struct ocrdma_driver ocrdma_drv = {
446 	.name			= "ocrdma_driver",
447 	.add			= ocrdma_add,
448 	.remove			= ocrdma_remove,
449 	.state_change_handler	= ocrdma_event_handler,
450 	.be_abi_version		= OCRDMA_BE_ROCE_ABI_VERSION,
451 };
452 
453 static int __init ocrdma_init_module(void)
454 {
455 	int status;
456 
457 	ocrdma_init_debugfs();
458 
459 	status = be_roce_register_driver(&ocrdma_drv);
460 	if (status)
461 		goto err_be_reg;
462 
463 	return 0;
464 
465 err_be_reg:
466 
467 	return status;
468 }
469 
470 static void __exit ocrdma_exit_module(void)
471 {
472 	be_roce_unregister_driver(&ocrdma_drv);
473 	ocrdma_rem_debugfs();
474 	idr_destroy(&ocrdma_dev_id);
475 }
476 
477 module_init(ocrdma_init_module);
478 module_exit(ocrdma_exit_module);
479