drivers/net/ethernet/qlogic/qede/qede_rdma.c

   1 /* QLogic qedr NIC Driver
   2  * Copyright (c) 2015-2017  QLogic Corporation
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and /or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32 #include <linux/pci.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/list.h>
  35 #include <linux/mutex.h>
  36 #include <linux/qed/qede_rdma.h>
  37 #include "qede.h"
  38
  39 static struct qedr_driver *qedr_drv;
  40 static LIST_HEAD(qedr_dev_list);
  41 static DEFINE_MUTEX(qedr_dev_list_lock);
  42
  43 bool qede_rdma_supported(struct qede_dev *dev)
  44 {
  45         return dev->dev_info.common.rdma_supported;
  46 }
  47
  48 static void _qede_rdma_dev_add(struct qede_dev *edev)
  49 {
  50         if (!qedr_drv)
  51                 return;
  52
  53         /* Leftovers from previous error recovery */
  54         edev->rdma_info.exp_recovery = false;
  55         edev->rdma_info.qedr_dev = qedr_drv->add(edev->cdev, edev->pdev,
  56                                                  edev->ndev);
  57 }
  58
  59 static int qede_rdma_create_wq(struct qede_dev *edev)
  60 {
  61         INIT_LIST_HEAD(&edev->rdma_info.rdma_event_list);
  62         edev->rdma_info.rdma_wq = create_singlethread_workqueue("rdma_wq");
  63         if (!edev->rdma_info.rdma_wq) {
  64                 DP_NOTICE(edev, "qedr: Could not create workqueue\n");
  65                 return -ENOMEM;
  66         }
  67
  68         return 0;
  69 }
  70
  71 static void qede_rdma_cleanup_event(struct qede_dev *edev)
  72 {
  73         struct list_head *head = &edev->rdma_info.rdma_event_list;
  74         struct qede_rdma_event_work *event_node;
  75
  76         flush_workqueue(edev->rdma_info.rdma_wq);
  77         while (!list_empty(head)) {
  78                 event_node = list_entry(head->next, struct qede_rdma_event_work,
  79                                         list);
  80                 cancel_work_sync(&event_node->work);
  81                 list_del(&event_node->list);
  82                 kfree(event_node);
  83         }
  84 }
  85
  86 static void qede_rdma_destroy_wq(struct qede_dev *edev)
  87 {
  88         qede_rdma_cleanup_event(edev);
  89         destroy_workqueue(edev->rdma_info.rdma_wq);
  90 }
  91
  92 int qede_rdma_dev_add(struct qede_dev *edev, bool recovery)
  93 {
  94         int rc;
  95
  96         if (!qede_rdma_supported(edev))
  97                 return 0;
  98
  99         /* Cannot start qedr while recovering since it wasn't fully stopped */
 100         if (recovery)
 101                 return 0;
 102
 103         rc = qede_rdma_create_wq(edev);
 104         if (rc)
 105                 return rc;
 106
 107         INIT_LIST_HEAD(&edev->rdma_info.entry);
 108         mutex_lock(&qedr_dev_list_lock);
 109         list_add_tail(&edev->rdma_info.entry, &qedr_dev_list);
 110         _qede_rdma_dev_add(edev);
 111         mutex_unlock(&qedr_dev_list_lock);
 112
 113         return rc;
 114 }
 115
 116 static void _qede_rdma_dev_remove(struct qede_dev *edev)
 117 {
 118         if (qedr_drv && qedr_drv->remove && edev->rdma_info.qedr_dev)
 119                 qedr_drv->remove(edev->rdma_info.qedr_dev);
 120 }
 121
 122 void qede_rdma_dev_remove(struct qede_dev *edev, bool recovery)
 123 {
 124         if (!qede_rdma_supported(edev))
 125                 return;
 126
 127         /* Cannot remove qedr while recovering since it wasn't fully stopped */
 128         if (!recovery) {
 129                 qede_rdma_destroy_wq(edev);
 130                 mutex_lock(&qedr_dev_list_lock);
 131                 if (!edev->rdma_info.exp_recovery)
 132                         _qede_rdma_dev_remove(edev);
 133                 edev->rdma_info.qedr_dev = NULL;
 134                 list_del(&edev->rdma_info.entry);
 135                 mutex_unlock(&qedr_dev_list_lock);
 136         } else {
 137                 if (!edev->rdma_info.exp_recovery) {
 138                         mutex_lock(&qedr_dev_list_lock);
 139                         _qede_rdma_dev_remove(edev);
 140                         mutex_unlock(&qedr_dev_list_lock);
 141                 }
 142                 edev->rdma_info.exp_recovery = true;
 143         }
 144 }
 145
 146 static void _qede_rdma_dev_open(struct qede_dev *edev)
 147 {
 148         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 149                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_UP);
 150 }
 151
 152 static void qede_rdma_dev_open(struct qede_dev *edev)
 153 {
 154         if (!qede_rdma_supported(edev))
 155                 return;
 156
 157         mutex_lock(&qedr_dev_list_lock);
 158         _qede_rdma_dev_open(edev);
 159         mutex_unlock(&qedr_dev_list_lock);
 160 }
 161
 162 static void _qede_rdma_dev_close(struct qede_dev *edev)
 163 {
 164         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 165                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_DOWN);
 166 }
 167
 168 static void qede_rdma_dev_close(struct qede_dev *edev)
 169 {
 170         if (!qede_rdma_supported(edev))
 171                 return;
 172
 173         mutex_lock(&qedr_dev_list_lock);
 174         _qede_rdma_dev_close(edev);
 175         mutex_unlock(&qedr_dev_list_lock);
 176 }
 177
 178 static void qede_rdma_dev_shutdown(struct qede_dev *edev)
 179 {
 180         if (!qede_rdma_supported(edev))
 181                 return;
 182
 183         mutex_lock(&qedr_dev_list_lock);
 184         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 185                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CLOSE);
 186         mutex_unlock(&qedr_dev_list_lock);
 187 }
 188
 189 int qede_rdma_register_driver(struct qedr_driver *drv)
 190 {
 191         struct qede_dev *edev;
 192         u8 qedr_counter = 0;
 193
 194         mutex_lock(&qedr_dev_list_lock);
 195         if (qedr_drv) {
 196                 mutex_unlock(&qedr_dev_list_lock);
 197                 return -EINVAL;
 198         }
 199         qedr_drv = drv;
 200
 201         list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
 202                 struct net_device *ndev;
 203
 204                 qedr_counter++;
 205                 _qede_rdma_dev_add(edev);
 206                 ndev = edev->ndev;
 207                 if (netif_running(ndev) && netif_oper_up(ndev))
 208                         _qede_rdma_dev_open(edev);
 209         }
 210         mutex_unlock(&qedr_dev_list_lock);
 211
 212         pr_notice("qedr: discovered and registered %d RDMA funcs\n",
 213                   qedr_counter);
 214
 215         return 0;
 216 }
 217 EXPORT_SYMBOL(qede_rdma_register_driver);
 218
 219 void qede_rdma_unregister_driver(struct qedr_driver *drv)
 220 {
 221         struct qede_dev *edev;
 222
 223         mutex_lock(&qedr_dev_list_lock);
 224         list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
 225                 /* If device has experienced recovery it was already removed */
 226                 if (edev->rdma_info.qedr_dev && !edev->rdma_info.exp_recovery)
 227                         _qede_rdma_dev_remove(edev);
 228         }
 229         qedr_drv = NULL;
 230         mutex_unlock(&qedr_dev_list_lock);
 231 }
 232 EXPORT_SYMBOL(qede_rdma_unregister_driver);
 233
 234 static void qede_rdma_changeaddr(struct qede_dev *edev)
 235 {
 236         if (!qede_rdma_supported(edev))
 237                 return;
 238
 239         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 240                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CHANGE_ADDR);
 241 }
 242
 243 static struct qede_rdma_event_work *
 244 qede_rdma_get_free_event_node(struct qede_dev *edev)
 245 {
 246         struct qede_rdma_event_work *event_node = NULL;
 247         struct list_head *list_node = NULL;
 248         bool found = false;
 249
 250         list_for_each(list_node, &edev->rdma_info.rdma_event_list) {
 251                 event_node = list_entry(list_node, struct qede_rdma_event_work,
 252                                         list);
 253                 if (!work_pending(&event_node->work)) {
 254                         found = true;
 255                         break;
 256                 }
 257         }
 258
 259         if (!found) {
 260                 event_node = kzalloc(sizeof(*event_node), GFP_ATOMIC);
 261                 if (!event_node) {
 262                         DP_NOTICE(edev,
 263                                   "qedr: Could not allocate memory for rdma work\n");
 264                         return NULL;
 265                 }
 266                 list_add_tail(&event_node->list,
 267                               &edev->rdma_info.rdma_event_list);
 268         }
 269
 270         return event_node;
 271 }
 272
 273 static void qede_rdma_handle_event(struct work_struct *work)
 274 {
 275         struct qede_rdma_event_work *event_node;
 276         enum qede_rdma_event event;
 277         struct qede_dev *edev;
 278
 279         event_node = container_of(work, struct qede_rdma_event_work, work);
 280         event = event_node->event;
 281         edev = event_node->ptr;
 282
 283         switch (event) {
 284         case QEDE_UP:
 285                 qede_rdma_dev_open(edev);
 286                 break;
 287         case QEDE_DOWN:
 288                 qede_rdma_dev_close(edev);
 289                 break;
 290         case QEDE_CLOSE:
 291                 qede_rdma_dev_shutdown(edev);
 292                 break;
 293         case QEDE_CHANGE_ADDR:
 294                 qede_rdma_changeaddr(edev);
 295                 break;
 296         default:
 297                 DP_NOTICE(edev, "Invalid rdma event %d", event);
 298         }
 299 }
 300
 301 static void qede_rdma_add_event(struct qede_dev *edev,
 302                                 enum qede_rdma_event event)
 303 {
 304         struct qede_rdma_event_work *event_node;
 305
 306         /* If a recovery was experienced avoid adding the event */
 307         if (edev->rdma_info.exp_recovery)
 308                 return;
 309
 310         if (!edev->rdma_info.qedr_dev)
 311                 return;
 312
 313         event_node = qede_rdma_get_free_event_node(edev);
 314         if (!event_node)
 315                 return;
 316
 317         event_node->event = event;
 318         event_node->ptr = edev;
 319
 320         INIT_WORK(&event_node->work, qede_rdma_handle_event);
 321         queue_work(edev->rdma_info.rdma_wq, &event_node->work);
 322 }
 323
 324 void qede_rdma_dev_event_open(struct qede_dev *edev)
 325 {
 326         qede_rdma_add_event(edev, QEDE_UP);
 327 }
 328
 329 void qede_rdma_dev_event_close(struct qede_dev *edev)
 330 {
 331         qede_rdma_add_event(edev, QEDE_DOWN);
 332 }
 333
 334 void qede_rdma_event_changeaddr(struct qede_dev *edev)
 335 {
 336         qede_rdma_add_event(edev, QEDE_CHANGE_ADDR);
 337 }