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 /* OCRDMA sysfs interface */
118 static ssize_t hw_rev_show(struct device *device,
119 			   struct device_attribute *attr, char *buf)
120 {
121 	struct ocrdma_dev *dev =
122 		rdma_device_to_drv_device(device, struct ocrdma_dev, ibdev);
123 
124 	return scnprintf(buf, PAGE_SIZE, "0x%x\n", dev->nic_info.pdev->vendor);
125 }
126 static DEVICE_ATTR_RO(hw_rev);
127 
128 static ssize_t hca_type_show(struct device *device,
129 			     struct device_attribute *attr, char *buf)
130 {
131 	struct ocrdma_dev *dev =
132 		rdma_device_to_drv_device(device, struct ocrdma_dev, ibdev);
133 
134 	return scnprintf(buf, PAGE_SIZE, "%s\n", &dev->model_number[0]);
135 }
136 static DEVICE_ATTR_RO(hca_type);
137 
138 static struct attribute *ocrdma_attributes[] = {
139 	&dev_attr_hw_rev.attr,
140 	&dev_attr_hca_type.attr,
141 	NULL
142 };
143 
144 static const struct attribute_group ocrdma_attr_group = {
145 	.attrs = ocrdma_attributes,
146 };
147 
148 static const struct ib_device_ops ocrdma_dev_ops = {
149 	.alloc_mr = ocrdma_alloc_mr,
150 	.alloc_pd = ocrdma_alloc_pd,
151 	.alloc_ucontext = ocrdma_alloc_ucontext,
152 	.create_ah = ocrdma_create_ah,
153 	.create_cq = ocrdma_create_cq,
154 	.create_qp = ocrdma_create_qp,
155 	.dealloc_pd = ocrdma_dealloc_pd,
156 	.dealloc_ucontext = ocrdma_dealloc_ucontext,
157 	.dereg_mr = ocrdma_dereg_mr,
158 	.destroy_ah = ocrdma_destroy_ah,
159 	.destroy_cq = ocrdma_destroy_cq,
160 	.destroy_qp = ocrdma_destroy_qp,
161 	.get_dev_fw_str = get_dev_fw_str,
162 	.get_dma_mr = ocrdma_get_dma_mr,
163 	.get_link_layer = ocrdma_link_layer,
164 	.get_netdev = ocrdma_get_netdev,
165 	.get_port_immutable = ocrdma_port_immutable,
166 	.map_mr_sg = ocrdma_map_mr_sg,
167 	.mmap = ocrdma_mmap,
168 	.modify_port = ocrdma_modify_port,
169 	.modify_qp = ocrdma_modify_qp,
170 	.poll_cq = ocrdma_poll_cq,
171 	.post_recv = ocrdma_post_recv,
172 	.post_send = ocrdma_post_send,
173 	.process_mad = ocrdma_process_mad,
174 	.query_ah = ocrdma_query_ah,
175 	.query_device = ocrdma_query_device,
176 	.query_pkey = ocrdma_query_pkey,
177 	.query_port = ocrdma_query_port,
178 	.query_qp = ocrdma_query_qp,
179 	.reg_user_mr = ocrdma_reg_user_mr,
180 	.req_notify_cq = ocrdma_arm_cq,
181 	.resize_cq = ocrdma_resize_cq,
182 	INIT_RDMA_OBJ_SIZE(ib_pd, ocrdma_pd, ibpd),
183 	INIT_RDMA_OBJ_SIZE(ib_ucontext, ocrdma_ucontext, ibucontext),
184 };
185 
186 static const struct ib_device_ops ocrdma_dev_srq_ops = {
187 	.create_srq = ocrdma_create_srq,
188 	.destroy_srq = ocrdma_destroy_srq,
189 	.modify_srq = ocrdma_modify_srq,
190 	.post_srq_recv = ocrdma_post_srq_recv,
191 	.query_srq = ocrdma_query_srq,
192 };
193 
194 static int ocrdma_register_device(struct ocrdma_dev *dev)
195 {
196 	ocrdma_get_guid(dev, (u8 *)&dev->ibdev.node_guid);
197 	BUILD_BUG_ON(sizeof(OCRDMA_NODE_DESC) > IB_DEVICE_NODE_DESC_MAX);
198 	memcpy(dev->ibdev.node_desc, OCRDMA_NODE_DESC,
199 	       sizeof(OCRDMA_NODE_DESC));
200 	dev->ibdev.owner = THIS_MODULE;
201 	dev->ibdev.uverbs_abi_ver = OCRDMA_ABI_VERSION;
202 	dev->ibdev.uverbs_cmd_mask =
203 	    OCRDMA_UVERBS(GET_CONTEXT) |
204 	    OCRDMA_UVERBS(QUERY_DEVICE) |
205 	    OCRDMA_UVERBS(QUERY_PORT) |
206 	    OCRDMA_UVERBS(ALLOC_PD) |
207 	    OCRDMA_UVERBS(DEALLOC_PD) |
208 	    OCRDMA_UVERBS(REG_MR) |
209 	    OCRDMA_UVERBS(DEREG_MR) |
210 	    OCRDMA_UVERBS(CREATE_COMP_CHANNEL) |
211 	    OCRDMA_UVERBS(CREATE_CQ) |
212 	    OCRDMA_UVERBS(RESIZE_CQ) |
213 	    OCRDMA_UVERBS(DESTROY_CQ) |
214 	    OCRDMA_UVERBS(REQ_NOTIFY_CQ) |
215 	    OCRDMA_UVERBS(CREATE_QP) |
216 	    OCRDMA_UVERBS(MODIFY_QP) |
217 	    OCRDMA_UVERBS(QUERY_QP) |
218 	    OCRDMA_UVERBS(DESTROY_QP) |
219 	    OCRDMA_UVERBS(POLL_CQ) |
220 	    OCRDMA_UVERBS(POST_SEND) |
221 	    OCRDMA_UVERBS(POST_RECV);
222 
223 	dev->ibdev.uverbs_cmd_mask |=
224 	    OCRDMA_UVERBS(CREATE_AH) |
225 	     OCRDMA_UVERBS(MODIFY_AH) |
226 	     OCRDMA_UVERBS(QUERY_AH) |
227 	     OCRDMA_UVERBS(DESTROY_AH);
228 
229 	dev->ibdev.node_type = RDMA_NODE_IB_CA;
230 	dev->ibdev.phys_port_cnt = 1;
231 	dev->ibdev.num_comp_vectors = dev->eq_cnt;
232 
233 	/* mandatory to support user space verbs consumer. */
234 	dev->ibdev.dev.parent = &dev->nic_info.pdev->dev;
235 
236 	ib_set_device_ops(&dev->ibdev, &ocrdma_dev_ops);
237 
238 	if (ocrdma_get_asic_type(dev) == OCRDMA_ASIC_GEN_SKH_R) {
239 		dev->ibdev.uverbs_cmd_mask |=
240 		     OCRDMA_UVERBS(CREATE_SRQ) |
241 		     OCRDMA_UVERBS(MODIFY_SRQ) |
242 		     OCRDMA_UVERBS(QUERY_SRQ) |
243 		     OCRDMA_UVERBS(DESTROY_SRQ) |
244 		     OCRDMA_UVERBS(POST_SRQ_RECV);
245 
246 		ib_set_device_ops(&dev->ibdev, &ocrdma_dev_srq_ops);
247 	}
248 	rdma_set_device_sysfs_group(&dev->ibdev, &ocrdma_attr_group);
249 	dev->ibdev.driver_id = RDMA_DRIVER_OCRDMA;
250 	return ib_register_device(&dev->ibdev, "ocrdma%d");
251 }
252 
253 static int ocrdma_alloc_resources(struct ocrdma_dev *dev)
254 {
255 	mutex_init(&dev->dev_lock);
256 	dev->cq_tbl = kcalloc(OCRDMA_MAX_CQ, sizeof(struct ocrdma_cq *),
257 			      GFP_KERNEL);
258 	if (!dev->cq_tbl)
259 		goto alloc_err;
260 
261 	if (dev->attr.max_qp) {
262 		dev->qp_tbl = kcalloc(OCRDMA_MAX_QP,
263 				      sizeof(struct ocrdma_qp *),
264 				      GFP_KERNEL);
265 		if (!dev->qp_tbl)
266 			goto alloc_err;
267 	}
268 
269 	dev->stag_arr = kcalloc(OCRDMA_MAX_STAG, sizeof(u64), GFP_KERNEL);
270 	if (dev->stag_arr == NULL)
271 		goto alloc_err;
272 
273 	ocrdma_alloc_pd_pool(dev);
274 
275 	if (!ocrdma_alloc_stats_resources(dev)) {
276 		pr_err("%s: stats resource allocation failed\n", __func__);
277 		goto alloc_err;
278 	}
279 
280 	spin_lock_init(&dev->av_tbl.lock);
281 	spin_lock_init(&dev->flush_q_lock);
282 	return 0;
283 alloc_err:
284 	pr_err("%s(%d) error.\n", __func__, dev->id);
285 	return -ENOMEM;
286 }
287 
288 static void ocrdma_free_resources(struct ocrdma_dev *dev)
289 {
290 	ocrdma_release_stats_resources(dev);
291 	kfree(dev->stag_arr);
292 	kfree(dev->qp_tbl);
293 	kfree(dev->cq_tbl);
294 }
295 
296 static struct ocrdma_dev *ocrdma_add(struct be_dev_info *dev_info)
297 {
298 	int status = 0;
299 	u8 lstate = 0;
300 	struct ocrdma_dev *dev;
301 
302 	dev = ib_alloc_device(ocrdma_dev, ibdev);
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 	/* Init stats */
335 	ocrdma_add_port_stats(dev);
336 	/* Interrupt Moderation */
337 	INIT_DELAYED_WORK(&dev->eqd_work, ocrdma_eqd_set_task);
338 	schedule_delayed_work(&dev->eqd_work, msecs_to_jiffies(1000));
339 
340 	pr_info("%s %s: %s \"%s\" port %d\n",
341 		dev_name(&dev->nic_info.pdev->dev), hca_name(dev),
342 		port_speed_string(dev), dev->model_number,
343 		dev->hba_port_num);
344 	pr_info("%s ocrdma%d driver loaded successfully\n",
345 		dev_name(&dev->nic_info.pdev->dev), dev->id);
346 	return dev;
347 
348 alloc_err:
349 	ocrdma_free_resources(dev);
350 	ocrdma_cleanup_hw(dev);
351 init_err:
352 	idr_remove(&ocrdma_dev_id, dev->id);
353 idr_err:
354 	kfree(dev->mbx_cmd);
355 	ib_dealloc_device(&dev->ibdev);
356 	pr_err("%s() leaving. ret=%d\n", __func__, status);
357 	return NULL;
358 }
359 
360 static void ocrdma_remove_free(struct ocrdma_dev *dev)
361 {
362 
363 	idr_remove(&ocrdma_dev_id, dev->id);
364 	kfree(dev->mbx_cmd);
365 	ib_dealloc_device(&dev->ibdev);
366 }
367 
368 static void ocrdma_remove(struct ocrdma_dev *dev)
369 {
370 	/* first unregister with stack to stop all the active traffic
371 	 * of the registered clients.
372 	 */
373 	cancel_delayed_work_sync(&dev->eqd_work);
374 	ib_unregister_device(&dev->ibdev);
375 
376 	ocrdma_rem_port_stats(dev);
377 	ocrdma_free_resources(dev);
378 	ocrdma_cleanup_hw(dev);
379 	ocrdma_remove_free(dev);
380 }
381 
382 static int ocrdma_dispatch_port_active(struct ocrdma_dev *dev)
383 {
384 	struct ib_event port_event;
385 
386 	port_event.event = IB_EVENT_PORT_ACTIVE;
387 	port_event.element.port_num = 1;
388 	port_event.device = &dev->ibdev;
389 	ib_dispatch_event(&port_event);
390 	return 0;
391 }
392 
393 static int ocrdma_dispatch_port_error(struct ocrdma_dev *dev)
394 {
395 	struct ib_event err_event;
396 
397 	err_event.event = IB_EVENT_PORT_ERR;
398 	err_event.element.port_num = 1;
399 	err_event.device = &dev->ibdev;
400 	ib_dispatch_event(&err_event);
401 	return 0;
402 }
403 
404 static void ocrdma_shutdown(struct ocrdma_dev *dev)
405 {
406 	ocrdma_dispatch_port_error(dev);
407 	ocrdma_remove(dev);
408 }
409 
410 /* event handling via NIC driver ensures that all the NIC specific
411  * initialization done before RoCE driver notifies
412  * event to stack.
413  */
414 static void ocrdma_event_handler(struct ocrdma_dev *dev, u32 event)
415 {
416 	switch (event) {
417 	case BE_DEV_SHUTDOWN:
418 		ocrdma_shutdown(dev);
419 		break;
420 	default:
421 		break;
422 	}
423 }
424 
425 void ocrdma_update_link_state(struct ocrdma_dev *dev, u8 lstate)
426 {
427 	if (!(dev->flags & OCRDMA_FLAGS_LINK_STATUS_INIT)) {
428 		dev->flags |= OCRDMA_FLAGS_LINK_STATUS_INIT;
429 		if (!lstate)
430 			return;
431 	}
432 
433 	if (!lstate)
434 		ocrdma_dispatch_port_error(dev);
435 	else
436 		ocrdma_dispatch_port_active(dev);
437 }
438 
439 static struct ocrdma_driver ocrdma_drv = {
440 	.name			= "ocrdma_driver",
441 	.add			= ocrdma_add,
442 	.remove			= ocrdma_remove,
443 	.state_change_handler	= ocrdma_event_handler,
444 	.be_abi_version		= OCRDMA_BE_ROCE_ABI_VERSION,
445 };
446 
447 static int __init ocrdma_init_module(void)
448 {
449 	int status;
450 
451 	ocrdma_init_debugfs();
452 
453 	status = be_roce_register_driver(&ocrdma_drv);
454 	if (status)
455 		goto err_be_reg;
456 
457 	return 0;
458 
459 err_be_reg:
460 
461 	return status;
462 }
463 
464 static void __exit ocrdma_exit_module(void)
465 {
466 	be_roce_unregister_driver(&ocrdma_drv);
467 	ocrdma_rem_debugfs();
468 	idr_destroy(&ocrdma_dev_id);
469 }
470 
471 module_init(ocrdma_init_module);
472 module_exit(ocrdma_exit_module);
473