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         edev->rdma_info.qedr_dev = qedr_drv->add(edev->cdev, edev->pdev,
  54                                                  edev->ndev);
  55 }
  56
  57 static int qede_rdma_create_wq(struct qede_dev *edev)
  58 {
  59         INIT_LIST_HEAD(&edev->rdma_info.rdma_event_list);
  60         edev->rdma_info.rdma_wq = create_singlethread_workqueue("rdma_wq");
  61         if (!edev->rdma_info.rdma_wq) {
  62                 DP_NOTICE(edev, "qedr: Could not create workqueue\n");
  63                 return -ENOMEM;
  64         }
  65
  66         return 0;
  67 }
  68
  69 static void qede_rdma_cleanup_event(struct qede_dev *edev)
  70 {
  71         struct list_head *head = &edev->rdma_info.rdma_event_list;
  72         struct qede_rdma_event_work *event_node;
  73
  74         flush_workqueue(edev->rdma_info.rdma_wq);
  75         while (!list_empty(head)) {
  76                 event_node = list_entry(head->next, struct qede_rdma_event_work,
  77                                         list);
  78                 cancel_work_sync(&event_node->work);
  79                 list_del(&event_node->list);
  80                 kfree(event_node);
  81         }
  82 }
  83
  84 static void qede_rdma_destroy_wq(struct qede_dev *edev)
  85 {
  86         qede_rdma_cleanup_event(edev);
  87         destroy_workqueue(edev->rdma_info.rdma_wq);
  88 }
  89
  90 int qede_rdma_dev_add(struct qede_dev *edev)
  91 {
  92         int rc = 0;
  93
  94         if (qede_rdma_supported(edev)) {
  95                 rc = qede_rdma_create_wq(edev);
  96                 if (rc)
  97                         return rc;
  98
  99                 INIT_LIST_HEAD(&edev->rdma_info.entry);
 100                 mutex_lock(&qedr_dev_list_lock);
 101                 list_add_tail(&edev->rdma_info.entry, &qedr_dev_list);
 102                 _qede_rdma_dev_add(edev);
 103                 mutex_unlock(&qedr_dev_list_lock);
 104         }
 105
 106         return rc;
 107 }
 108
 109 static void _qede_rdma_dev_remove(struct qede_dev *edev)
 110 {
 111         if (qedr_drv && qedr_drv->remove && edev->rdma_info.qedr_dev)
 112                 qedr_drv->remove(edev->rdma_info.qedr_dev);
 113         edev->rdma_info.qedr_dev = NULL;
 114 }
 115
 116 void qede_rdma_dev_remove(struct qede_dev *edev)
 117 {
 118         if (!qede_rdma_supported(edev))
 119                 return;
 120
 121         qede_rdma_destroy_wq(edev);
 122         mutex_lock(&qedr_dev_list_lock);
 123         _qede_rdma_dev_remove(edev);
 124         list_del(&edev->rdma_info.entry);
 125         mutex_unlock(&qedr_dev_list_lock);
 126 }
 127
 128 static void _qede_rdma_dev_open(struct qede_dev *edev)
 129 {
 130         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 131                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_UP);
 132 }
 133
 134 static void qede_rdma_dev_open(struct qede_dev *edev)
 135 {
 136         if (!qede_rdma_supported(edev))
 137                 return;
 138
 139         mutex_lock(&qedr_dev_list_lock);
 140         _qede_rdma_dev_open(edev);
 141         mutex_unlock(&qedr_dev_list_lock);
 142 }
 143
 144 static void _qede_rdma_dev_close(struct qede_dev *edev)
 145 {
 146         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 147                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_DOWN);
 148 }
 149
 150 static void qede_rdma_dev_close(struct qede_dev *edev)
 151 {
 152         if (!qede_rdma_supported(edev))
 153                 return;
 154
 155         mutex_lock(&qedr_dev_list_lock);
 156         _qede_rdma_dev_close(edev);
 157         mutex_unlock(&qedr_dev_list_lock);
 158 }
 159
 160 static void qede_rdma_dev_shutdown(struct qede_dev *edev)
 161 {
 162         if (!qede_rdma_supported(edev))
 163                 return;
 164
 165         mutex_lock(&qedr_dev_list_lock);
 166         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 167                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CLOSE);
 168         mutex_unlock(&qedr_dev_list_lock);
 169 }
 170
 171 int qede_rdma_register_driver(struct qedr_driver *drv)
 172 {
 173         struct qede_dev *edev;
 174         u8 qedr_counter = 0;
 175
 176         mutex_lock(&qedr_dev_list_lock);
 177         if (qedr_drv) {
 178                 mutex_unlock(&qedr_dev_list_lock);
 179                 return -EINVAL;
 180         }
 181         qedr_drv = drv;
 182
 183         list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
 184                 struct net_device *ndev;
 185
 186                 qedr_counter++;
 187                 _qede_rdma_dev_add(edev);
 188                 ndev = edev->ndev;
 189                 if (netif_running(ndev) && netif_oper_up(ndev))
 190                         _qede_rdma_dev_open(edev);
 191         }
 192         mutex_unlock(&qedr_dev_list_lock);
 193
 194         pr_notice("qedr: discovered and registered %d RDMA funcs\n",
 195                   qedr_counter);
 196
 197         return 0;
 198 }
 199 EXPORT_SYMBOL(qede_rdma_register_driver);
 200
 201 void qede_rdma_unregister_driver(struct qedr_driver *drv)
 202 {
 203         struct qede_dev *edev;
 204
 205         mutex_lock(&qedr_dev_list_lock);
 206         list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
 207                 if (edev->rdma_info.qedr_dev)
 208                         _qede_rdma_dev_remove(edev);
 209         }
 210         qedr_drv = NULL;
 211         mutex_unlock(&qedr_dev_list_lock);
 212 }
 213 EXPORT_SYMBOL(qede_rdma_unregister_driver);
 214
 215 static void qede_rdma_changeaddr(struct qede_dev *edev)
 216 {
 217         if (!qede_rdma_supported(edev))
 218                 return;
 219
 220         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 221                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CHANGE_ADDR);
 222 }
 223
 224 static struct qede_rdma_event_work *
 225 qede_rdma_get_free_event_node(struct qede_dev *edev)
 226 {
 227         struct qede_rdma_event_work *event_node = NULL;
 228         struct list_head *list_node = NULL;
 229         bool found = false;
 230
 231         list_for_each(list_node, &edev->rdma_info.rdma_event_list) {
 232                 event_node = list_entry(list_node, struct qede_rdma_event_work,
 233                                         list);
 234                 if (!work_pending(&event_node->work)) {
 235                         found = true;
 236                         break;
 237                 }
 238         }
 239
 240         if (!found) {
 241                 event_node = kzalloc(sizeof(*event_node), GFP_KERNEL);
 242                 if (!event_node) {
 243                         DP_NOTICE(edev,
 244                                   "qedr: Could not allocate memory for rdma work\n");
 245                         return NULL;
 246                 }
 247                 list_add_tail(&event_node->list,
 248                               &edev->rdma_info.rdma_event_list);
 249         }
 250
 251         return event_node;
 252 }
 253
 254 static void qede_rdma_handle_event(struct work_struct *work)
 255 {
 256         struct qede_rdma_event_work *event_node;
 257         enum qede_rdma_event event;
 258         struct qede_dev *edev;
 259
 260         event_node = container_of(work, struct qede_rdma_event_work, work);
 261         event = event_node->event;
 262         edev = event_node->ptr;
 263
 264         switch (event) {
 265         case QEDE_UP:
 266                 qede_rdma_dev_open(edev);
 267                 break;
 268         case QEDE_DOWN:
 269                 qede_rdma_dev_close(edev);
 270                 break;
 271         case QEDE_CLOSE:
 272                 qede_rdma_dev_shutdown(edev);
 273                 break;
 274         case QEDE_CHANGE_ADDR:
 275                 qede_rdma_changeaddr(edev);
 276                 break;
 277         default:
 278                 DP_NOTICE(edev, "Invalid rdma event %d", event);
 279         }
 280 }
 281
 282 static void qede_rdma_add_event(struct qede_dev *edev,
 283                                 enum qede_rdma_event event)
 284 {
 285         struct qede_rdma_event_work *event_node;
 286
 287         if (!edev->rdma_info.qedr_dev)
 288                 return;
 289
 290         event_node = qede_rdma_get_free_event_node(edev);
 291         if (!event_node)
 292                 return;
 293
 294         event_node->event = event;
 295         event_node->ptr = edev;
 296
 297         INIT_WORK(&event_node->work, qede_rdma_handle_event);
 298         queue_work(edev->rdma_info.rdma_wq, &event_node->work);
 299 }
 300
 301 void qede_rdma_dev_event_open(struct qede_dev *edev)
 302 {
 303         qede_rdma_add_event(edev, QEDE_UP);
 304 }
 305
 306 void qede_rdma_dev_event_close(struct qede_dev *edev)
 307 {
 308         qede_rdma_add_event(edev, QEDE_DOWN);
 309 }
 310
 311 void qede_rdma_event_changeaddr(struct qede_dev *edev)
 312 {
 313         qede_rdma_add_event(edev, QEDE_CHANGE_ADDR);
 314 }