drivers/net/ethernet/qlogic/qede/qede

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This source file includes following definitions.
qede_rdma_supported
_qede_rdma_dev_add
qede_rdma_create_wq
qede_rdma_cleanup_event
qede_rdma_complete_event
qede_rdma_destroy_wq
qede_rdma_dev_add
_qede_rdma_dev_remove
qede_rdma_dev_remove
_qede_rdma_dev_open
qede_rdma_dev_open
_qede_rdma_dev_close
qede_rdma_dev_close
qede_rdma_dev_shutdown
qede_rdma_register_driver
qede_rdma_unregister_driver
qede_rdma_changeaddr
qede_rdma_get_free_event_node
qede_rdma_handle_event
qede_rdma_add_event
qede_rdma_dev_event_open
qede_rdma_dev_event_close
qede_rdma_event_changeaddr
   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         kref_init(&edev->rdma_info.refcnt);
  63         init_completion(&edev->rdma_info.event_comp);
  64 
  65         edev->rdma_info.rdma_wq = create_singlethread_workqueue("rdma_wq");
  66         if (!edev->rdma_info.rdma_wq) {
  67                 DP_NOTICE(edev, "qedr: Could not create workqueue\n");
  68                 return -ENOMEM;
  69         }
  70 
  71         return 0;
  72 }
  73 
  74 static void qede_rdma_cleanup_event(struct qede_dev *edev)
  75 {
  76         struct list_head *head = &edev->rdma_info.rdma_event_list;
  77         struct qede_rdma_event_work *event_node;
  78 
  79         flush_workqueue(edev->rdma_info.rdma_wq);
  80         while (!list_empty(head)) {
  81                 event_node = list_entry(head->next, struct qede_rdma_event_work,
  82                                         list);
  83                 cancel_work_sync(&event_node->work);
  84                 list_del(&event_node->list);
  85                 kfree(event_node);
  86         }
  87 }
  88 
  89 static void qede_rdma_complete_event(struct kref *ref)
  90 {
  91         struct qede_rdma_dev *rdma_dev =
  92                 container_of(ref, struct qede_rdma_dev, refcnt);
  93 
  94         /* no more events will be added after this */
  95         complete(&rdma_dev->event_comp);
  96 }
  97 
  98 static void qede_rdma_destroy_wq(struct qede_dev *edev)
  99 {
 100         /* Avoid race with add_event flow, make sure it finishes before
 101          * we start accessing the list and cleaning up the work
 102          */
 103         kref_put(&edev->rdma_info.refcnt, qede_rdma_complete_event);
 104         wait_for_completion(&edev->rdma_info.event_comp);
 105 
 106         qede_rdma_cleanup_event(edev);
 107         destroy_workqueue(edev->rdma_info.rdma_wq);
 108 }
 109 
 110 int qede_rdma_dev_add(struct qede_dev *edev, bool recovery)
 111 {
 112         int rc;
 113 
 114         if (!qede_rdma_supported(edev))
 115                 return 0;
 116 
 117         /* Cannot start qedr while recovering since it wasn't fully stopped */
 118         if (recovery)
 119                 return 0;
 120 
 121         rc = qede_rdma_create_wq(edev);
 122         if (rc)
 123                 return rc;
 124 
 125         INIT_LIST_HEAD(&edev->rdma_info.entry);
 126         mutex_lock(&qedr_dev_list_lock);
 127         list_add_tail(&edev->rdma_info.entry, &qedr_dev_list);
 128         _qede_rdma_dev_add(edev);
 129         mutex_unlock(&qedr_dev_list_lock);
 130 
 131         return rc;
 132 }
 133 
 134 static void _qede_rdma_dev_remove(struct qede_dev *edev)
 135 {
 136         if (qedr_drv && qedr_drv->remove && edev->rdma_info.qedr_dev)
 137                 qedr_drv->remove(edev->rdma_info.qedr_dev);
 138 }
 139 
 140 void qede_rdma_dev_remove(struct qede_dev *edev, bool recovery)
 141 {
 142         if (!qede_rdma_supported(edev))
 143                 return;
 144 
 145         /* Cannot remove qedr while recovering since it wasn't fully stopped */
 146         if (!recovery) {
 147                 qede_rdma_destroy_wq(edev);
 148                 mutex_lock(&qedr_dev_list_lock);
 149                 if (!edev->rdma_info.exp_recovery)
 150                         _qede_rdma_dev_remove(edev);
 151                 edev->rdma_info.qedr_dev = NULL;
 152                 list_del(&edev->rdma_info.entry);
 153                 mutex_unlock(&qedr_dev_list_lock);
 154         } else {
 155                 if (!edev->rdma_info.exp_recovery) {
 156                         mutex_lock(&qedr_dev_list_lock);
 157                         _qede_rdma_dev_remove(edev);
 158                         mutex_unlock(&qedr_dev_list_lock);
 159                 }
 160                 edev->rdma_info.exp_recovery = true;
 161         }
 162 }
 163 
 164 static void _qede_rdma_dev_open(struct qede_dev *edev)
 165 {
 166         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 167                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_UP);
 168 }
 169 
 170 static void qede_rdma_dev_open(struct qede_dev *edev)
 171 {
 172         if (!qede_rdma_supported(edev))
 173                 return;
 174 
 175         mutex_lock(&qedr_dev_list_lock);
 176         _qede_rdma_dev_open(edev);
 177         mutex_unlock(&qedr_dev_list_lock);
 178 }
 179 
 180 static void _qede_rdma_dev_close(struct qede_dev *edev)
 181 {
 182         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 183                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_DOWN);
 184 }
 185 
 186 static void qede_rdma_dev_close(struct qede_dev *edev)
 187 {
 188         if (!qede_rdma_supported(edev))
 189                 return;
 190 
 191         mutex_lock(&qedr_dev_list_lock);
 192         _qede_rdma_dev_close(edev);
 193         mutex_unlock(&qedr_dev_list_lock);
 194 }
 195 
 196 static void qede_rdma_dev_shutdown(struct qede_dev *edev)
 197 {
 198         if (!qede_rdma_supported(edev))
 199                 return;
 200 
 201         mutex_lock(&qedr_dev_list_lock);
 202         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 203                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CLOSE);
 204         mutex_unlock(&qedr_dev_list_lock);
 205 }
 206 
 207 int qede_rdma_register_driver(struct qedr_driver *drv)
 208 {
 209         struct qede_dev *edev;
 210         u8 qedr_counter = 0;
 211 
 212         mutex_lock(&qedr_dev_list_lock);
 213         if (qedr_drv) {
 214                 mutex_unlock(&qedr_dev_list_lock);
 215                 return -EINVAL;
 216         }
 217         qedr_drv = drv;
 218 
 219         list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
 220                 struct net_device *ndev;
 221 
 222                 qedr_counter++;
 223                 _qede_rdma_dev_add(edev);
 224                 ndev = edev->ndev;
 225                 if (netif_running(ndev) && netif_oper_up(ndev))
 226                         _qede_rdma_dev_open(edev);
 227         }
 228         mutex_unlock(&qedr_dev_list_lock);
 229 
 230         pr_notice("qedr: discovered and registered %d RDMA funcs\n",
 231                   qedr_counter);
 232 
 233         return 0;
 234 }
 235 EXPORT_SYMBOL(qede_rdma_register_driver);
 236 
 237 void qede_rdma_unregister_driver(struct qedr_driver *drv)
 238 {
 239         struct qede_dev *edev;
 240 
 241         mutex_lock(&qedr_dev_list_lock);
 242         list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
 243                 /* If device has experienced recovery it was already removed */
 244                 if (edev->rdma_info.qedr_dev && !edev->rdma_info.exp_recovery)
 245                         _qede_rdma_dev_remove(edev);
 246         }
 247         qedr_drv = NULL;
 248         mutex_unlock(&qedr_dev_list_lock);
 249 }
 250 EXPORT_SYMBOL(qede_rdma_unregister_driver);
 251 
 252 static void qede_rdma_changeaddr(struct qede_dev *edev)
 253 {
 254         if (!qede_rdma_supported(edev))
 255                 return;
 256 
 257         if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
 258                 qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CHANGE_ADDR);
 259 }
 260 
 261 static struct qede_rdma_event_work *
 262 qede_rdma_get_free_event_node(struct qede_dev *edev)
 263 {
 264         struct qede_rdma_event_work *event_node = NULL;
 265         struct list_head *list_node = NULL;
 266         bool found = false;
 267 
 268         list_for_each(list_node, &edev->rdma_info.rdma_event_list) {
 269                 event_node = list_entry(list_node, struct qede_rdma_event_work,
 270                                         list);
 271                 if (!work_pending(&event_node->work)) {
 272                         found = true;
 273                         break;
 274                 }
 275         }
 276 
 277         if (!found) {
 278                 event_node = kzalloc(sizeof(*event_node), GFP_ATOMIC);
 279                 if (!event_node) {
 280                         DP_NOTICE(edev,
 281                                   "qedr: Could not allocate memory for rdma work\n");
 282                         return NULL;
 283                 }
 284                 list_add_tail(&event_node->list,
 285                               &edev->rdma_info.rdma_event_list);
 286         }
 287 
 288         return event_node;
 289 }
 290 
 291 static void qede_rdma_handle_event(struct work_struct *work)
 292 {
 293         struct qede_rdma_event_work *event_node;
 294         enum qede_rdma_event event;
 295         struct qede_dev *edev;
 296 
 297         event_node = container_of(work, struct qede_rdma_event_work, work);
 298         event = event_node->event;
 299         edev = event_node->ptr;
 300 
 301         switch (event) {
 302         case QEDE_UP:
 303                 qede_rdma_dev_open(edev);
 304                 break;
 305         case QEDE_DOWN:
 306                 qede_rdma_dev_close(edev);
 307                 break;
 308         case QEDE_CLOSE:
 309                 qede_rdma_dev_shutdown(edev);
 310                 break;
 311         case QEDE_CHANGE_ADDR:
 312                 qede_rdma_changeaddr(edev);
 313                 break;
 314         default:
 315                 DP_NOTICE(edev, "Invalid rdma event %d", event);
 316         }
 317 }
 318 
 319 static void qede_rdma_add_event(struct qede_dev *edev,
 320                                 enum qede_rdma_event event)
 321 {
 322         struct qede_rdma_event_work *event_node;
 323 
 324         /* If a recovery was experienced avoid adding the event */
 325         if (edev->rdma_info.exp_recovery)
 326                 return;
 327 
 328         if (!edev->rdma_info.qedr_dev)
 329                 return;
 330 
 331         /* We don't want the cleanup flow to start while we're allocating and
 332          * scheduling the work
 333          */
 334         if (!kref_get_unless_zero(&edev->rdma_info.refcnt))
 335                 return; /* already being destroyed */
 336 
 337         event_node = qede_rdma_get_free_event_node(edev);
 338         if (!event_node)
 339                 goto out;
 340 
 341         event_node->event = event;
 342         event_node->ptr = edev;
 343 
 344         INIT_WORK(&event_node->work, qede_rdma_handle_event);
 345         queue_work(edev->rdma_info.rdma_wq, &event_node->work);
 346 
 347 out:
 348         kref_put(&edev->rdma_info.refcnt, qede_rdma_complete_event);
 349 }
 350 
 351 void qede_rdma_dev_event_open(struct qede_dev *edev)
 352 {
 353         qede_rdma_add_event(edev, QEDE_UP);
 354 }
 355 
 356 void qede_rdma_dev_event_close(struct qede_dev *edev)
 357 {
 358         qede_rdma_add_event(edev, QEDE_DOWN);
 359 }
 360 
 361 void qede_rdma_event_changeaddr(struct qede_dev *edev)
 362 {
 363         qede_rdma_add_event(edev, QEDE_CHANGE_ADDR);
 364 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/ethernet/qlogic/qede/qede_rdma.c

DEFINITIONS
