drivers/net/wireless/ath/wil6210/netdev.c

   1 // SPDX-License-Identifier: ISC
   2 /*
   3  * Copyright (c) 2012-2017 Qualcomm Atheros, Inc.
   4  * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
   5  */
   6
   7 #include <linux/etherdevice.h>
   8 #include <linux/rtnetlink.h>
   9 #include "wil6210.h"
  10 #include "txrx.h"
  11
  12 bool wil_has_other_active_ifaces(struct wil6210_priv *wil,
  13                                  struct net_device *ndev, bool up, bool ok)
  14 {
  15         int i;
  16         struct wil6210_vif *vif;
  17         struct net_device *ndev_i;
  18
  19         for (i = 0; i < GET_MAX_VIFS(wil); i++) {
  20                 vif = wil->vifs[i];
  21                 if (vif) {
  22                         ndev_i = vif_to_ndev(vif);
  23                         if (ndev_i != ndev)
  24                                 if ((up && (ndev_i->flags & IFF_UP)) ||
  25                                     (ok && netif_carrier_ok(ndev_i)))
  26                                         return true;
  27                 }
  28         }
  29
  30         return false;
  31 }
  32
  33 bool wil_has_active_ifaces(struct wil6210_priv *wil, bool up, bool ok)
  34 {
  35         /* use NULL ndev argument to check all interfaces */
  36         return wil_has_other_active_ifaces(wil, NULL, up, ok);
  37 }
  38
  39 static int wil_open(struct net_device *ndev)
  40 {
  41         struct wil6210_priv *wil = ndev_to_wil(ndev);
  42         int rc = 0;
  43
  44         wil_dbg_misc(wil, "open\n");
  45
  46         if (debug_fw ||
  47             test_bit(WMI_FW_CAPABILITY_WMI_ONLY, wil->fw_capabilities)) {
  48                 wil_err(wil, "while in debug_fw or wmi_only mode\n");
  49                 return -EINVAL;
  50         }
  51
  52         if (!wil_has_other_active_ifaces(wil, ndev, true, false)) {
  53                 wil_dbg_misc(wil, "open, first iface\n");
  54                 rc = wil_pm_runtime_get(wil);
  55                 if (rc < 0)
  56                         return rc;
  57
  58                 rc = wil_up(wil);
  59                 if (rc)
  60                         wil_pm_runtime_put(wil);
  61         }
  62
  63         return rc;
  64 }
  65
  66 static int wil_stop(struct net_device *ndev)
  67 {
  68         struct wil6210_priv *wil = ndev_to_wil(ndev);
  69         int rc = 0;
  70
  71         wil_dbg_misc(wil, "stop\n");
  72
  73         if (!wil_has_other_active_ifaces(wil, ndev, true, false)) {
  74                 wil_dbg_misc(wil, "stop, last iface\n");
  75                 rc = wil_down(wil);
  76                 if (!rc)
  77                         wil_pm_runtime_put(wil);
  78         }
  79
  80         return rc;
  81 }
  82
  83 static const struct net_device_ops wil_netdev_ops = {
  84         .ndo_open               = wil_open,
  85         .ndo_stop               = wil_stop,
  86         .ndo_start_xmit         = wil_start_xmit,
  87         .ndo_set_mac_address    = eth_mac_addr,
  88         .ndo_validate_addr      = eth_validate_addr,
  89 };
  90
  91 static int wil6210_netdev_poll_rx(struct napi_struct *napi, int budget)
  92 {
  93         struct wil6210_priv *wil = container_of(napi, struct wil6210_priv,
  94                                                 napi_rx);
  95         int quota = budget;
  96         int done;
  97
  98         wil_rx_handle(wil, &quota);
  99         done = budget - quota;
 100
 101         if (done < budget) {
 102                 napi_complete_done(napi, done);
 103                 wil6210_unmask_irq_rx(wil);
 104                 wil_dbg_txrx(wil, "NAPI RX complete\n");
 105         }
 106
 107         wil_dbg_txrx(wil, "NAPI RX poll(%d) done %d\n", budget, done);
 108
 109         return done;
 110 }
 111
 112 static int wil6210_netdev_poll_rx_edma(struct napi_struct *napi, int budget)
 113 {
 114         struct wil6210_priv *wil = container_of(napi, struct wil6210_priv,
 115                                                 napi_rx);
 116         int quota = budget;
 117         int done;
 118
 119         wil_rx_handle_edma(wil, &quota);
 120         done = budget - quota;
 121
 122         if (done < budget) {
 123                 napi_complete_done(napi, done);
 124                 wil6210_unmask_irq_rx_edma(wil);
 125                 wil_dbg_txrx(wil, "NAPI RX complete\n");
 126         }
 127
 128         wil_dbg_txrx(wil, "NAPI RX poll(%d) done %d\n", budget, done);
 129
 130         return done;
 131 }
 132
 133 static int wil6210_netdev_poll_tx(struct napi_struct *napi, int budget)
 134 {
 135         struct wil6210_priv *wil = container_of(napi, struct wil6210_priv,
 136                                                 napi_tx);
 137         int tx_done = 0;
 138         uint i;
 139
 140         /* always process ALL Tx complete, regardless budget - it is fast */
 141         for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
 142                 struct wil_ring *ring = &wil->ring_tx[i];
 143                 struct wil_ring_tx_data *txdata = &wil->ring_tx_data[i];
 144                 struct wil6210_vif *vif;
 145
 146                 if (!ring->va || !txdata->enabled ||
 147                     txdata->mid >= GET_MAX_VIFS(wil))
 148                         continue;
 149
 150                 vif = wil->vifs[txdata->mid];
 151                 if (unlikely(!vif)) {
 152                         wil_dbg_txrx(wil, "Invalid MID %d\n", txdata->mid);
 153                         continue;
 154                 }
 155
 156                 tx_done += wil_tx_complete(vif, i);
 157         }
 158
 159         if (tx_done < budget) {
 160                 napi_complete(napi);
 161                 wil6210_unmask_irq_tx(wil);
 162                 wil_dbg_txrx(wil, "NAPI TX complete\n");
 163         }
 164
 165         wil_dbg_txrx(wil, "NAPI TX poll(%d) done %d\n", budget, tx_done);
 166
 167         return min(tx_done, budget);
 168 }
 169
 170 static int wil6210_netdev_poll_tx_edma(struct napi_struct *napi, int budget)
 171 {
 172         struct wil6210_priv *wil = container_of(napi, struct wil6210_priv,
 173                                                 napi_tx);
 174         int tx_done;
 175         /* There is only one status TX ring */
 176         struct wil_status_ring *sring = &wil->srings[wil->tx_sring_idx];
 177
 178         if (!sring->va)
 179                 return 0;
 180
 181         tx_done = wil_tx_sring_handler(wil, sring);
 182
 183         if (tx_done < budget) {
 184                 napi_complete(napi);
 185                 wil6210_unmask_irq_tx_edma(wil);
 186                 wil_dbg_txrx(wil, "NAPI TX complete\n");
 187         }
 188
 189         wil_dbg_txrx(wil, "NAPI TX poll(%d) done %d\n", budget, tx_done);
 190
 191         return min(tx_done, budget);
 192 }
 193
 194 static void wil_dev_setup(struct net_device *dev)
 195 {
 196         ether_setup(dev);
 197         dev->max_mtu = mtu_max;
 198         dev->tx_queue_len = WIL_TX_Q_LEN_DEFAULT;
 199 }
 200
 201 static void wil_vif_deinit(struct wil6210_vif *vif)
 202 {
 203         del_timer_sync(&vif->scan_timer);
 204         del_timer_sync(&vif->p2p.discovery_timer);
 205         cancel_work_sync(&vif->disconnect_worker);
 206         cancel_work_sync(&vif->p2p.discovery_expired_work);
 207         cancel_work_sync(&vif->p2p.delayed_listen_work);
 208         wil_probe_client_flush(vif);
 209         cancel_work_sync(&vif->probe_client_worker);
 210         cancel_work_sync(&vif->enable_tx_key_worker);
 211 }
 212
 213 void wil_vif_free(struct wil6210_vif *vif)
 214 {
 215         struct net_device *ndev = vif_to_ndev(vif);
 216
 217         wil_vif_deinit(vif);
 218         free_netdev(ndev);
 219 }
 220
 221 static void wil_ndev_destructor(struct net_device *ndev)
 222 {
 223         struct wil6210_vif *vif = ndev_to_vif(ndev);
 224
 225         wil_vif_deinit(vif);
 226 }
 227
 228 static void wil_connect_timer_fn(struct timer_list *t)
 229 {
 230         struct wil6210_vif *vif = from_timer(vif, t, connect_timer);
 231         struct wil6210_priv *wil = vif_to_wil(vif);
 232         bool q;
 233
 234         wil_err(wil, "Connect timeout detected, disconnect station\n");
 235
 236         /* reschedule to thread context - disconnect won't
 237          * run from atomic context.
 238          * queue on wmi_wq to prevent race with connect event.
 239          */
 240         q = queue_work(wil->wmi_wq, &vif->disconnect_worker);
 241         wil_dbg_wmi(wil, "queue_work of disconnect_worker -> %d\n", q);
 242 }
 243
 244 static void wil_scan_timer_fn(struct timer_list *t)
 245 {
 246         struct wil6210_vif *vif = from_timer(vif, t, scan_timer);
 247         struct wil6210_priv *wil = vif_to_wil(vif);
 248
 249         clear_bit(wil_status_fwready, wil->status);
 250         wil_err(wil, "Scan timeout detected, start fw error recovery\n");
 251         wil_fw_error_recovery(wil);
 252 }
 253
 254 static void wil_p2p_discovery_timer_fn(struct timer_list *t)
 255 {
 256         struct wil6210_vif *vif = from_timer(vif, t, p2p.discovery_timer);
 257         struct wil6210_priv *wil = vif_to_wil(vif);
 258
 259         wil_dbg_misc(wil, "p2p_discovery_timer_fn\n");
 260
 261         schedule_work(&vif->p2p.discovery_expired_work);
 262 }
 263
 264 static void wil_vif_init(struct wil6210_vif *vif)
 265 {
 266         vif->bcast_ring = -1;
 267
 268         mutex_init(&vif->probe_client_mutex);
 269
 270         timer_setup(&vif->connect_timer, wil_connect_timer_fn, 0);
 271         timer_setup(&vif->scan_timer, wil_scan_timer_fn, 0);
 272         timer_setup(&vif->p2p.discovery_timer, wil_p2p_discovery_timer_fn, 0);
 273
 274         INIT_WORK(&vif->probe_client_worker, wil_probe_client_worker);
 275         INIT_WORK(&vif->disconnect_worker, wil_disconnect_worker);
 276         INIT_WORK(&vif->p2p.discovery_expired_work, wil_p2p_listen_expired);
 277         INIT_WORK(&vif->p2p.delayed_listen_work, wil_p2p_delayed_listen_work);
 278         INIT_WORK(&vif->enable_tx_key_worker, wil_enable_tx_key_worker);
 279
 280         INIT_LIST_HEAD(&vif->probe_client_pending);
 281
 282         vif->net_queue_stopped = 1;
 283 }
 284
 285 static u8 wil_vif_find_free_mid(struct wil6210_priv *wil)
 286 {
 287         u8 i;
 288
 289         for (i = 0; i < GET_MAX_VIFS(wil); i++) {
 290                 if (!wil->vifs[i])
 291                         return i;
 292         }
 293
 294         return U8_MAX;
 295 }
 296
 297 struct wil6210_vif *
 298 wil_vif_alloc(struct wil6210_priv *wil, const char *name,
 299               unsigned char name_assign_type, enum nl80211_iftype iftype)
 300 {
 301         struct net_device *ndev;
 302         struct wireless_dev *wdev;
 303         struct wil6210_vif *vif;
 304         u8 mid;
 305
 306         mid = wil_vif_find_free_mid(wil);
 307         if (mid == U8_MAX) {
 308                 wil_err(wil, "no available virtual interface\n");
 309                 return ERR_PTR(-EINVAL);
 310         }
 311
 312         ndev = alloc_netdev(sizeof(*vif), name, name_assign_type,
 313                             wil_dev_setup);
 314         if (!ndev) {
 315                 dev_err(wil_to_dev(wil), "alloc_netdev failed\n");
 316                 return ERR_PTR(-ENOMEM);
 317         }
 318         if (mid == 0) {
 319                 wil->main_ndev = ndev;
 320         } else {
 321                 ndev->priv_destructor = wil_ndev_destructor;
 322                 ndev->needs_free_netdev = true;
 323         }
 324
 325         vif = ndev_to_vif(ndev);
 326         vif->ndev = ndev;
 327         vif->wil = wil;
 328         vif->mid = mid;
 329         wil_vif_init(vif);
 330
 331         wdev = &vif->wdev;
 332         wdev->wiphy = wil->wiphy;
 333         wdev->iftype = iftype;
 334
 335         ndev->netdev_ops = &wil_netdev_ops;
 336         wil_set_ethtoolops(ndev);
 337         ndev->ieee80211_ptr = wdev;
 338         ndev->hw_features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
 339                             NETIF_F_SG | NETIF_F_GRO |
 340                             NETIF_F_TSO | NETIF_F_TSO6;
 341
 342         ndev->features |= ndev->hw_features;
 343         SET_NETDEV_DEV(ndev, wiphy_dev(wdev->wiphy));
 344         wdev->netdev = ndev;
 345         return vif;
 346 }
 347
 348 void *wil_if_alloc(struct device *dev)
 349 {
 350         struct wil6210_priv *wil;
 351         struct wil6210_vif *vif;
 352         int rc = 0;
 353
 354         wil = wil_cfg80211_init(dev);
 355         if (IS_ERR(wil)) {
 356                 dev_err(dev, "wil_cfg80211_init failed\n");
 357                 return wil;
 358         }
 359
 360         rc = wil_priv_init(wil);
 361         if (rc) {
 362                 dev_err(dev, "wil_priv_init failed\n");
 363                 goto out_cfg;
 364         }
 365
 366         wil_dbg_misc(wil, "if_alloc\n");
 367
 368         vif = wil_vif_alloc(wil, "wlan%d", NET_NAME_UNKNOWN,
 369                             NL80211_IFTYPE_STATION);
 370         if (IS_ERR(vif)) {
 371                 dev_err(dev, "wil_vif_alloc failed\n");
 372                 rc = -ENOMEM;
 373                 goto out_priv;
 374         }
 375
 376         wil->radio_wdev = vif_to_wdev(vif);
 377
 378         return wil;
 379
 380 out_priv:
 381         wil_priv_deinit(wil);
 382
 383 out_cfg:
 384         wil_cfg80211_deinit(wil);
 385
 386         return ERR_PTR(rc);
 387 }
 388
 389 void wil_if_free(struct wil6210_priv *wil)
 390 {
 391         struct net_device *ndev = wil->main_ndev;
 392
 393         wil_dbg_misc(wil, "if_free\n");
 394
 395         if (!ndev)
 396                 return;
 397
 398         wil_priv_deinit(wil);
 399
 400         wil->main_ndev = NULL;
 401         wil_ndev_destructor(ndev);
 402         free_netdev(ndev);
 403
 404         wil_cfg80211_deinit(wil);
 405 }
 406
 407 int wil_vif_add(struct wil6210_priv *wil, struct wil6210_vif *vif)
 408 {
 409         struct net_device *ndev = vif_to_ndev(vif);
 410         struct wireless_dev *wdev = vif_to_wdev(vif);
 411         bool any_active = wil_has_active_ifaces(wil, true, false);
 412         int rc;
 413
 414         ASSERT_RTNL();
 415
 416         if (wil->vifs[vif->mid]) {
 417                 dev_err(&ndev->dev, "VIF with mid %d already in use\n",
 418                         vif->mid);
 419                 return -EEXIST;
 420         }
 421         if (any_active && vif->mid != 0) {
 422                 rc = wmi_port_allocate(wil, vif->mid, ndev->dev_addr,
 423                                        wdev->iftype);
 424                 if (rc)
 425                         return rc;
 426         }
 427         rc = cfg80211_register_netdevice(ndev);
 428         if (rc < 0) {
 429                 dev_err(&ndev->dev, "Failed to register netdev: %d\n", rc);
 430                 if (any_active && vif->mid != 0)
 431                         wmi_port_delete(wil, vif->mid);
 432                 return rc;
 433         }
 434
 435         wil->vifs[vif->mid] = vif;
 436         return 0;
 437 }
 438
 439 int wil_if_add(struct wil6210_priv *wil)
 440 {
 441         struct wiphy *wiphy = wil->wiphy;
 442         struct net_device *ndev = wil->main_ndev;
 443         struct wil6210_vif *vif = ndev_to_vif(ndev);
 444         int rc;
 445
 446         wil_dbg_misc(wil, "entered");
 447
 448         strlcpy(wiphy->fw_version, wil->fw_version, sizeof(wiphy->fw_version));
 449
 450         rc = wiphy_register(wiphy);
 451         if (rc < 0) {
 452                 wil_err(wil, "failed to register wiphy, err %d\n", rc);
 453                 return rc;
 454         }
 455
 456         init_dummy_netdev(&wil->napi_ndev);
 457         if (wil->use_enhanced_dma_hw) {
 458                 netif_napi_add(&wil->napi_ndev, &wil->napi_rx,
 459                                wil6210_netdev_poll_rx_edma,
 460                                WIL6210_NAPI_BUDGET);
 461                 netif_tx_napi_add(&wil->napi_ndev,
 462                                   &wil->napi_tx, wil6210_netdev_poll_tx_edma,
 463                                   WIL6210_NAPI_BUDGET);
 464         } else {
 465                 netif_napi_add(&wil->napi_ndev, &wil->napi_rx,
 466                                wil6210_netdev_poll_rx,
 467                                WIL6210_NAPI_BUDGET);
 468                 netif_tx_napi_add(&wil->napi_ndev,
 469                                   &wil->napi_tx, wil6210_netdev_poll_tx,
 470                                   WIL6210_NAPI_BUDGET);
 471         }
 472
 473         wil_update_net_queues_bh(wil, vif, NULL, true);
 474
 475         rtnl_lock();
 476         wiphy_lock(wiphy);
 477         rc = wil_vif_add(wil, vif);
 478         wiphy_unlock(wiphy);
 479         rtnl_unlock();
 480         if (rc < 0)
 481                 goto out_wiphy;
 482
 483         return 0;
 484
 485 out_wiphy:
 486         wiphy_unregister(wiphy);
 487         return rc;
 488 }
 489
 490 void wil_vif_remove(struct wil6210_priv *wil, u8 mid)
 491 {
 492         struct wil6210_vif *vif;
 493         struct net_device *ndev;
 494         bool any_active = wil_has_active_ifaces(wil, true, false);
 495
 496         ASSERT_RTNL();
 497         if (mid >= GET_MAX_VIFS(wil)) {
 498                 wil_err(wil, "invalid MID: %d\n", mid);
 499                 return;
 500         }
 501
 502         vif = wil->vifs[mid];
 503         if (!vif) {
 504                 wil_err(wil, "MID %d not registered\n", mid);
 505                 return;
 506         }
 507
 508         mutex_lock(&wil->mutex);
 509         wil6210_disconnect(vif, NULL, WLAN_REASON_DEAUTH_LEAVING);
 510         mutex_unlock(&wil->mutex);
 511
 512         ndev = vif_to_ndev(vif);
 513         /* during unregister_netdevice cfg80211_leave may perform operations
 514          * such as stop AP, disconnect, so we only clear the VIF afterwards
 515          */
 516         cfg80211_unregister_netdevice(ndev);
 517
 518         if (any_active && vif->mid != 0)
 519                 wmi_port_delete(wil, vif->mid);
 520
 521         /* make sure no one is accessing the VIF before removing */
 522         mutex_lock(&wil->vif_mutex);
 523         wil->vifs[mid] = NULL;
 524         /* ensure NAPI code will see the NULL VIF */
 525         wmb();
 526         if (test_bit(wil_status_napi_en, wil->status)) {
 527                 napi_synchronize(&wil->napi_rx);
 528                 napi_synchronize(&wil->napi_tx);
 529         }
 530         mutex_unlock(&wil->vif_mutex);
 531
 532         flush_work(&wil->wmi_event_worker);
 533         del_timer_sync(&vif->connect_timer);
 534         cancel_work_sync(&vif->disconnect_worker);
 535         wil_probe_client_flush(vif);
 536         cancel_work_sync(&vif->probe_client_worker);
 537         cancel_work_sync(&vif->enable_tx_key_worker);
 538         /* for VIFs, ndev will be freed by destructor after RTNL is unlocked.
 539          * the main interface will be freed in wil_if_free, we need to keep it
 540          * a bit longer so logging macros will work.
 541          */
 542 }
 543
 544 void wil_if_remove(struct wil6210_priv *wil)
 545 {
 546         struct net_device *ndev = wil->main_ndev;
 547         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 548         struct wiphy *wiphy = wdev->wiphy;
 549
 550         wil_dbg_misc(wil, "if_remove\n");
 551
 552         rtnl_lock();
 553         wiphy_lock(wiphy);
 554         wil_vif_remove(wil, 0);
 555         wiphy_unlock(wiphy);
 556         rtnl_unlock();
 557
 558         netif_napi_del(&wil->napi_tx);
 559         netif_napi_del(&wil->napi_rx);
 560
 561         wiphy_unregister(wiphy);
 562 }