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1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
2/* QLogic qedr NIC Driver
3 * Copyright (c) 2015-2017 QLogic Corporation
4 * Copyright (c) 2019-2020 Marvell International Ltd.
5 */
6
7#include <linux/pci.h>
8#include <linux/netdevice.h>
9#include <linux/list.h>
10#include <linux/mutex.h>
11#include <linux/qed/qede_rdma.h>
12#include "qede.h"
13
14static struct qedr_driver *qedr_drv;
15static LIST_HEAD(qedr_dev_list);
16static DEFINE_MUTEX(qedr_dev_list_lock);
17
18bool qede_rdma_supported(struct qede_dev *dev)
19{
20 return dev->dev_info.common.rdma_supported;
21}
22
23static void _qede_rdma_dev_add(struct qede_dev *edev)
24{
25 if (!qedr_drv)
26 return;
27
28 /* Leftovers from previous error recovery */
29 edev->rdma_info.exp_recovery = false;
30 edev->rdma_info.qedr_dev = qedr_drv->add(edev->cdev, edev->pdev,
31 edev->ndev);
32}
33
34static int qede_rdma_create_wq(struct qede_dev *edev)
35{
36 INIT_LIST_HEAD(&edev->rdma_info.rdma_event_list);
37 kref_init(&edev->rdma_info.refcnt);
38 init_completion(&edev->rdma_info.event_comp);
39
40 edev->rdma_info.rdma_wq = create_singlethread_workqueue("rdma_wq");
41 if (!edev->rdma_info.rdma_wq) {
42 DP_NOTICE(edev, "qedr: Could not create workqueue\n");
43 return -ENOMEM;
44 }
45
46 return 0;
47}
48
49static void qede_rdma_cleanup_event(struct qede_dev *edev)
50{
51 struct list_head *head = &edev->rdma_info.rdma_event_list;
52 struct qede_rdma_event_work *event_node;
53
54 flush_workqueue(edev->rdma_info.rdma_wq);
55 while (!list_empty(head)) {
56 event_node = list_entry(head->next, struct qede_rdma_event_work,
57 list);
58 cancel_work_sync(&event_node->work);
59 list_del(&event_node->list);
60 kfree(event_node);
61 }
62}
63
64static void qede_rdma_complete_event(struct kref *ref)
65{
66 struct qede_rdma_dev *rdma_dev =
67 container_of(ref, struct qede_rdma_dev, refcnt);
68
69 /* no more events will be added after this */
70 complete(&rdma_dev->event_comp);
71}
72
73static void qede_rdma_destroy_wq(struct qede_dev *edev)
74{
75 /* Avoid race with add_event flow, make sure it finishes before
76 * we start accessing the list and cleaning up the work
77 */
78 kref_put(&edev->rdma_info.refcnt, qede_rdma_complete_event);
79 wait_for_completion(&edev->rdma_info.event_comp);
80
81 qede_rdma_cleanup_event(edev);
82 destroy_workqueue(edev->rdma_info.rdma_wq);
83 edev->rdma_info.rdma_wq = NULL;
84}
85
86int qede_rdma_dev_add(struct qede_dev *edev, bool recovery)
87{
88 int rc;
89
90 if (!qede_rdma_supported(edev))
91 return 0;
92
93 /* Cannot start qedr while recovering since it wasn't fully stopped */
94 if (recovery)
95 return 0;
96
97 rc = qede_rdma_create_wq(edev);
98 if (rc)
99 return rc;
100
101 INIT_LIST_HEAD(&edev->rdma_info.entry);
102 mutex_lock(&qedr_dev_list_lock);
103 list_add_tail(&edev->rdma_info.entry, &qedr_dev_list);
104 _qede_rdma_dev_add(edev);
105 mutex_unlock(&qedr_dev_list_lock);
106
107 return rc;
108}
109
110static void _qede_rdma_dev_remove(struct qede_dev *edev)
111{
112 if (qedr_drv && qedr_drv->remove && edev->rdma_info.qedr_dev)
113 qedr_drv->remove(edev->rdma_info.qedr_dev);
114}
115
116void qede_rdma_dev_remove(struct qede_dev *edev, bool recovery)
117{
118 if (!qede_rdma_supported(edev))
119 return;
120
121 /* Cannot remove qedr while recovering since it wasn't fully stopped */
122 if (!recovery) {
123 qede_rdma_destroy_wq(edev);
124 mutex_lock(&qedr_dev_list_lock);
125 if (!edev->rdma_info.exp_recovery)
126 _qede_rdma_dev_remove(edev);
127 edev->rdma_info.qedr_dev = NULL;
128 list_del(&edev->rdma_info.entry);
129 mutex_unlock(&qedr_dev_list_lock);
130 } else {
131 if (!edev->rdma_info.exp_recovery) {
132 mutex_lock(&qedr_dev_list_lock);
133 _qede_rdma_dev_remove(edev);
134 mutex_unlock(&qedr_dev_list_lock);
135 }
136 edev->rdma_info.exp_recovery = true;
137 }
138}
139
140static void _qede_rdma_dev_open(struct qede_dev *edev)
141{
142 if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
143 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_UP);
144}
145
146static void qede_rdma_dev_open(struct qede_dev *edev)
147{
148 if (!qede_rdma_supported(edev))
149 return;
150
151 mutex_lock(&qedr_dev_list_lock);
152 _qede_rdma_dev_open(edev);
153 mutex_unlock(&qedr_dev_list_lock);
154}
155
156static void _qede_rdma_dev_close(struct qede_dev *edev)
157{
158 if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
159 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_DOWN);
160}
161
162static void qede_rdma_dev_close(struct qede_dev *edev)
163{
164 if (!qede_rdma_supported(edev))
165 return;
166
167 mutex_lock(&qedr_dev_list_lock);
168 _qede_rdma_dev_close(edev);
169 mutex_unlock(&qedr_dev_list_lock);
170}
171
172static void qede_rdma_dev_shutdown(struct qede_dev *edev)
173{
174 if (!qede_rdma_supported(edev))
175 return;
176
177 mutex_lock(&qedr_dev_list_lock);
178 if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
179 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CLOSE);
180 mutex_unlock(&qedr_dev_list_lock);
181}
182
183int qede_rdma_register_driver(struct qedr_driver *drv)
184{
185 struct qede_dev *edev;
186 u8 qedr_counter = 0;
187
188 mutex_lock(&qedr_dev_list_lock);
189 if (qedr_drv) {
190 mutex_unlock(&qedr_dev_list_lock);
191 return -EINVAL;
192 }
193 qedr_drv = drv;
194
195 list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
196 struct net_device *ndev;
197
198 qedr_counter++;
199 _qede_rdma_dev_add(edev);
200 ndev = edev->ndev;
201 if (netif_running(ndev) && netif_oper_up(ndev))
202 _qede_rdma_dev_open(edev);
203 }
204 mutex_unlock(&qedr_dev_list_lock);
205
206 pr_notice("qedr: discovered and registered %d RDMA funcs\n",
207 qedr_counter);
208
209 return 0;
210}
211EXPORT_SYMBOL(qede_rdma_register_driver);
212
213void qede_rdma_unregister_driver(struct qedr_driver *drv)
214{
215 struct qede_dev *edev;
216
217 mutex_lock(&qedr_dev_list_lock);
218 list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
219 /* If device has experienced recovery it was already removed */
220 if (edev->rdma_info.qedr_dev && !edev->rdma_info.exp_recovery)
221 _qede_rdma_dev_remove(edev);
222 }
223 qedr_drv = NULL;
224 mutex_unlock(&qedr_dev_list_lock);
225}
226EXPORT_SYMBOL(qede_rdma_unregister_driver);
227
228static void qede_rdma_changeaddr(struct qede_dev *edev)
229{
230 if (!qede_rdma_supported(edev))
231 return;
232
233 if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
234 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CHANGE_ADDR);
235}
236
237static void qede_rdma_change_mtu(struct qede_dev *edev)
238{
239 if (qede_rdma_supported(edev)) {
240 if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
241 qedr_drv->notify(edev->rdma_info.qedr_dev,
242 QEDE_CHANGE_MTU);
243 }
244}
245
246static struct qede_rdma_event_work *
247qede_rdma_get_free_event_node(struct qede_dev *edev)
248{
249 struct qede_rdma_event_work *event_node = NULL;
250 bool found = false;
251
252 list_for_each_entry(event_node, &edev->rdma_info.rdma_event_list,
253 list) {
254 if (!work_pending(&event_node->work)) {
255 found = true;
256 break;
257 }
258 }
259
260 if (!found) {
261 event_node = kzalloc(sizeof(*event_node), GFP_ATOMIC);
262 if (!event_node) {
263 DP_NOTICE(edev,
264 "qedr: Could not allocate memory for rdma work\n");
265 return NULL;
266 }
267 list_add_tail(&event_node->list,
268 &edev->rdma_info.rdma_event_list);
269 }
270
271 return event_node;
272}
273
274static void qede_rdma_handle_event(struct work_struct *work)
275{
276 struct qede_rdma_event_work *event_node;
277 enum qede_rdma_event event;
278 struct qede_dev *edev;
279
280 event_node = container_of(work, struct qede_rdma_event_work, work);
281 event = event_node->event;
282 edev = event_node->ptr;
283
284 switch (event) {
285 case QEDE_UP:
286 qede_rdma_dev_open(edev);
287 break;
288 case QEDE_DOWN:
289 qede_rdma_dev_close(edev);
290 break;
291 case QEDE_CLOSE:
292 qede_rdma_dev_shutdown(edev);
293 break;
294 case QEDE_CHANGE_ADDR:
295 qede_rdma_changeaddr(edev);
296 break;
297 case QEDE_CHANGE_MTU:
298 qede_rdma_change_mtu(edev);
299 break;
300 default:
301 DP_NOTICE(edev, "Invalid rdma event %d", event);
302 }
303}
304
305static void qede_rdma_add_event(struct qede_dev *edev,
306 enum qede_rdma_event event)
307{
308 struct qede_rdma_event_work *event_node;
309
310 /* If a recovery was experienced avoid adding the event */
311 if (edev->rdma_info.exp_recovery)
312 return;
313
314 if (!edev->rdma_info.qedr_dev || !edev->rdma_info.rdma_wq)
315 return;
316
317 /* We don't want the cleanup flow to start while we're allocating and
318 * scheduling the work
319 */
320 if (!kref_get_unless_zero(&edev->rdma_info.refcnt))
321 return; /* already being destroyed */
322
323 event_node = qede_rdma_get_free_event_node(edev);
324 if (!event_node)
325 goto out;
326
327 event_node->event = event;
328 event_node->ptr = edev;
329
330 INIT_WORK(&event_node->work, qede_rdma_handle_event);
331 queue_work(edev->rdma_info.rdma_wq, &event_node->work);
332
333out:
334 kref_put(&edev->rdma_info.refcnt, qede_rdma_complete_event);
335}
336
337void qede_rdma_dev_event_open(struct qede_dev *edev)
338{
339 qede_rdma_add_event(edev, QEDE_UP);
340}
341
342void qede_rdma_dev_event_close(struct qede_dev *edev)
343{
344 qede_rdma_add_event(edev, QEDE_DOWN);
345}
346
347void qede_rdma_event_changeaddr(struct qede_dev *edev)
348{
349 qede_rdma_add_event(edev, QEDE_CHANGE_ADDR);
350}
351
352void qede_rdma_event_change_mtu(struct qede_dev *edev)
353{
354 qede_rdma_add_event(edev, QEDE_CHANGE_MTU);
355}