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.
8 #include <linux/netdevice.h>
9 #include <linux/list.h>
10 #include <linux/mutex.h>
11 #include <linux/qed/qede_rdma.h>
14 static struct qedr_driver *qedr_drv;
15 static LIST_HEAD(qedr_dev_list);
16 static DEFINE_MUTEX(qedr_dev_list_lock);
18 bool qede_rdma_supported(struct qede_dev *dev)
20 return dev->dev_info.common.rdma_supported;
23 static void _qede_rdma_dev_add(struct qede_dev *edev)
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,
34 static int qede_rdma_create_wq(struct qede_dev *edev)
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);
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");
49 static void qede_rdma_cleanup_event(struct qede_dev *edev)
51 struct list_head *head = &edev->rdma_info.rdma_event_list;
52 struct qede_rdma_event_work *event_node;
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,
58 cancel_work_sync(&event_node->work);
59 list_del(&event_node->list);
64 static void qede_rdma_complete_event(struct kref *ref)
66 struct qede_rdma_dev *rdma_dev =
67 container_of(ref, struct qede_rdma_dev, refcnt);
69 /* no more events will be added after this */
70 complete(&rdma_dev->event_comp);
73 static void qede_rdma_destroy_wq(struct qede_dev *edev)
75 /* Avoid race with add_event flow, make sure it finishes before
76 * we start accessing the list and cleaning up the work
78 kref_put(&edev->rdma_info.refcnt, qede_rdma_complete_event);
79 wait_for_completion(&edev->rdma_info.event_comp);
81 qede_rdma_cleanup_event(edev);
82 destroy_workqueue(edev->rdma_info.rdma_wq);
83 edev->rdma_info.rdma_wq = NULL;
86 int qede_rdma_dev_add(struct qede_dev *edev, bool recovery)
90 if (!qede_rdma_supported(edev))
93 /* Cannot start qedr while recovering since it wasn't fully stopped */
97 rc = qede_rdma_create_wq(edev);
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);
110 static void _qede_rdma_dev_remove(struct qede_dev *edev)
112 if (qedr_drv && qedr_drv->remove && edev->rdma_info.qedr_dev)
113 qedr_drv->remove(edev->rdma_info.qedr_dev);
116 void qede_rdma_dev_remove(struct qede_dev *edev, bool recovery)
118 if (!qede_rdma_supported(edev))
121 /* Cannot remove qedr while recovering since it wasn't fully stopped */
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);
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);
136 edev->rdma_info.exp_recovery = true;
140 static void _qede_rdma_dev_open(struct qede_dev *edev)
142 if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
143 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_UP);
146 static void qede_rdma_dev_open(struct qede_dev *edev)
148 if (!qede_rdma_supported(edev))
151 mutex_lock(&qedr_dev_list_lock);
152 _qede_rdma_dev_open(edev);
153 mutex_unlock(&qedr_dev_list_lock);
156 static void _qede_rdma_dev_close(struct qede_dev *edev)
158 if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
159 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_DOWN);
162 static void qede_rdma_dev_close(struct qede_dev *edev)
164 if (!qede_rdma_supported(edev))
167 mutex_lock(&qedr_dev_list_lock);
168 _qede_rdma_dev_close(edev);
169 mutex_unlock(&qedr_dev_list_lock);
172 static void qede_rdma_dev_shutdown(struct qede_dev *edev)
174 if (!qede_rdma_supported(edev))
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);
183 int qede_rdma_register_driver(struct qedr_driver *drv)
185 struct qede_dev *edev;
188 mutex_lock(&qedr_dev_list_lock);
190 mutex_unlock(&qedr_dev_list_lock);
195 list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
196 struct net_device *ndev;
199 _qede_rdma_dev_add(edev);
201 if (netif_running(ndev) && netif_oper_up(ndev))
202 _qede_rdma_dev_open(edev);
204 mutex_unlock(&qedr_dev_list_lock);
206 pr_notice("qedr: discovered and registered %d RDMA funcs\n",
211 EXPORT_SYMBOL(qede_rdma_register_driver);
213 void qede_rdma_unregister_driver(struct qedr_driver *drv)
215 struct qede_dev *edev;
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);
224 mutex_unlock(&qedr_dev_list_lock);
226 EXPORT_SYMBOL(qede_rdma_unregister_driver);
228 static void qede_rdma_changeaddr(struct qede_dev *edev)
230 if (!qede_rdma_supported(edev))
233 if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
234 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CHANGE_ADDR);
237 static void qede_rdma_change_mtu(struct qede_dev *edev)
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,
246 static struct qede_rdma_event_work *
247 qede_rdma_get_free_event_node(struct qede_dev *edev)
249 struct qede_rdma_event_work *event_node = NULL;
250 struct list_head *list_node = NULL;
253 list_for_each(list_node, &edev->rdma_info.rdma_event_list) {
254 event_node = list_entry(list_node, struct qede_rdma_event_work,
256 if (!work_pending(&event_node->work)) {
263 event_node = kzalloc(sizeof(*event_node), GFP_ATOMIC);
266 "qedr: Could not allocate memory for rdma work\n");
269 list_add_tail(&event_node->list,
270 &edev->rdma_info.rdma_event_list);
276 static void qede_rdma_handle_event(struct work_struct *work)
278 struct qede_rdma_event_work *event_node;
279 enum qede_rdma_event event;
280 struct qede_dev *edev;
282 event_node = container_of(work, struct qede_rdma_event_work, work);
283 event = event_node->event;
284 edev = event_node->ptr;
288 qede_rdma_dev_open(edev);
291 qede_rdma_dev_close(edev);
294 qede_rdma_dev_shutdown(edev);
296 case QEDE_CHANGE_ADDR:
297 qede_rdma_changeaddr(edev);
299 case QEDE_CHANGE_MTU:
300 qede_rdma_change_mtu(edev);
303 DP_NOTICE(edev, "Invalid rdma event %d", event);
307 static void qede_rdma_add_event(struct qede_dev *edev,
308 enum qede_rdma_event event)
310 struct qede_rdma_event_work *event_node;
312 /* If a recovery was experienced avoid adding the event */
313 if (edev->rdma_info.exp_recovery)
316 if (!edev->rdma_info.qedr_dev || !edev->rdma_info.rdma_wq)
319 /* We don't want the cleanup flow to start while we're allocating and
320 * scheduling the work
322 if (!kref_get_unless_zero(&edev->rdma_info.refcnt))
323 return; /* already being destroyed */
325 event_node = qede_rdma_get_free_event_node(edev);
329 event_node->event = event;
330 event_node->ptr = edev;
332 INIT_WORK(&event_node->work, qede_rdma_handle_event);
333 queue_work(edev->rdma_info.rdma_wq, &event_node->work);
336 kref_put(&edev->rdma_info.refcnt, qede_rdma_complete_event);
339 void qede_rdma_dev_event_open(struct qede_dev *edev)
341 qede_rdma_add_event(edev, QEDE_UP);
344 void qede_rdma_dev_event_close(struct qede_dev *edev)
346 qede_rdma_add_event(edev, QEDE_DOWN);
349 void qede_rdma_event_changeaddr(struct qede_dev *edev)
351 qede_rdma_add_event(edev, QEDE_CHANGE_ADDR);
354 void qede_rdma_event_change_mtu(struct qede_dev *edev)
356 qede_rdma_add_event(edev, QEDE_CHANGE_MTU);