drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c

   1 /* Broadcom NetXtreme-C/E network driver.
   2  *
   3  * Copyright (c) 2016-2018 Broadcom Limited
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation.
   8  */
   9
  10 #include <linux/module.h>
  11
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/pci.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/bitops.h>
  19 #include <linux/irq.h>
  20 #include <asm/byteorder.h>
  21 #include <linux/bitmap.h>
  22 #include <linux/auxiliary_bus.h>
  23
  24 #include "bnxt_hsi.h"
  25 #include "bnxt.h"
  26 #include "bnxt_hwrm.h"
  27 #include "bnxt_ulp.h"
  28
  29 static DEFINE_IDA(bnxt_aux_dev_ids);
  30
  31 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent)
  32 {
  33         struct bnxt_en_dev *edev = bp->edev;
  34         int num_msix, i;
  35
  36         if (!edev->ulp_tbl->msix_requested) {
  37                 netdev_warn(bp->dev, "Requested MSI-X vectors insufficient\n");
  38                 return;
  39         }
  40         num_msix = edev->ulp_tbl->msix_requested;
  41         for (i = 0; i < num_msix; i++) {
  42                 ent[i].vector = bp->irq_tbl[i].vector;
  43                 ent[i].ring_idx = i;
  44                 if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS)
  45                         ent[i].db_offset = bp->db_offset;
  46                 else
  47                         ent[i].db_offset = i * 0x80;
  48         }
  49 }
  50
  51 int bnxt_get_ulp_msix_num(struct bnxt *bp)
  52 {
  53         if (bp->edev)
  54                 return bp->edev->ulp_num_msix_vec;
  55         return 0;
  56 }
  57
  58 void bnxt_set_ulp_msix_num(struct bnxt *bp, int num)
  59 {
  60         if (bp->edev)
  61                 bp->edev->ulp_num_msix_vec = num;
  62 }
  63
  64 int bnxt_get_ulp_msix_num_in_use(struct bnxt *bp)
  65 {
  66         if (bnxt_ulp_registered(bp->edev))
  67                 return bp->edev->ulp_num_msix_vec;
  68         return 0;
  69 }
  70
  71 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp)
  72 {
  73         if (bp->edev)
  74                 return bp->edev->ulp_num_ctxs;
  75         return 0;
  76 }
  77
  78 void bnxt_set_ulp_stat_ctxs(struct bnxt *bp, int num_ulp_ctx)
  79 {
  80         if (bp->edev)
  81                 bp->edev->ulp_num_ctxs = num_ulp_ctx;
  82 }
  83
  84 int bnxt_get_ulp_stat_ctxs_in_use(struct bnxt *bp)
  85 {
  86         if (bnxt_ulp_registered(bp->edev))
  87                 return bp->edev->ulp_num_ctxs;
  88         return 0;
  89 }
  90
  91 void bnxt_set_dflt_ulp_stat_ctxs(struct bnxt *bp)
  92 {
  93         if (bp->edev) {
  94                 bp->edev->ulp_num_ctxs = BNXT_MIN_ROCE_STAT_CTXS;
  95                 /* Reserve one additional stat_ctx for PF0 (except
  96                  * on 1-port NICs) as it also creates one stat_ctx
  97                  * for PF1 in case of RoCE bonding.
  98                  */
  99                 if (BNXT_PF(bp) && !bp->pf.port_id &&
 100                     bp->port_count > 1)
 101                         bp->edev->ulp_num_ctxs++;
 102         }
 103 }
 104
 105 int bnxt_register_dev(struct bnxt_en_dev *edev,
 106                       struct bnxt_ulp_ops *ulp_ops,
 107                       void *handle)
 108 {
 109         struct net_device *dev = edev->net;
 110         struct bnxt *bp = netdev_priv(dev);
 111         unsigned int max_stat_ctxs;
 112         struct bnxt_ulp *ulp;
 113         int rc = 0;
 114
 115         rtnl_lock();
 116         mutex_lock(&edev->en_dev_lock);
 117         if (!bp->irq_tbl) {
 118                 rc = -ENODEV;
 119                 goto exit;
 120         }
 121         max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
 122         if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS ||
 123             bp->cp_nr_rings == max_stat_ctxs) {
 124                 rc = -ENOMEM;
 125                 goto exit;
 126         }
 127
 128         ulp = edev->ulp_tbl;
 129         ulp->handle = handle;
 130         rcu_assign_pointer(ulp->ulp_ops, ulp_ops);
 131
 132         if (test_bit(BNXT_STATE_OPEN, &bp->state))
 133                 bnxt_hwrm_vnic_cfg(bp, &bp->vnic_info[BNXT_VNIC_DEFAULT]);
 134
 135         edev->ulp_tbl->msix_requested = bnxt_get_ulp_msix_num(bp);
 136
 137         bnxt_fill_msix_vecs(bp, bp->edev->msix_entries);
 138         edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
 139 exit:
 140         mutex_unlock(&edev->en_dev_lock);
 141         rtnl_unlock();
 142         return rc;
 143 }
 144 EXPORT_SYMBOL(bnxt_register_dev);
 145
 146 void bnxt_unregister_dev(struct bnxt_en_dev *edev)
 147 {
 148         struct net_device *dev = edev->net;
 149         struct bnxt *bp = netdev_priv(dev);
 150         struct bnxt_ulp *ulp;
 151         int i = 0;
 152
 153         ulp = edev->ulp_tbl;
 154         rtnl_lock();
 155         mutex_lock(&edev->en_dev_lock);
 156         if (ulp->msix_requested)
 157                 edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
 158         edev->ulp_tbl->msix_requested = 0;
 159
 160         if (ulp->max_async_event_id)
 161                 bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true);
 162
 163         RCU_INIT_POINTER(ulp->ulp_ops, NULL);
 164         synchronize_rcu();
 165         ulp->max_async_event_id = 0;
 166         ulp->async_events_bmap = NULL;
 167         while (atomic_read(&ulp->ref_count) != 0 && i < 10) {
 168                 msleep(100);
 169                 i++;
 170         }
 171         mutex_unlock(&edev->en_dev_lock);
 172         rtnl_unlock();
 173         return;
 174 }
 175 EXPORT_SYMBOL(bnxt_unregister_dev);
 176
 177 static int bnxt_set_dflt_ulp_msix(struct bnxt *bp)
 178 {
 179         u32 roce_msix = BNXT_VF(bp) ?
 180                         BNXT_MAX_VF_ROCE_MSIX : BNXT_MAX_ROCE_MSIX;
 181
 182         return ((bp->flags & BNXT_FLAG_ROCE_CAP) ?
 183                 min_t(u32, roce_msix, num_online_cpus()) : 0);
 184 }
 185
 186 int bnxt_send_msg(struct bnxt_en_dev *edev,
 187                          struct bnxt_fw_msg *fw_msg)
 188 {
 189         struct net_device *dev = edev->net;
 190         struct bnxt *bp = netdev_priv(dev);
 191         struct output *resp;
 192         struct input *req;
 193         u32 resp_len;
 194         int rc;
 195
 196         if (bp->fw_reset_state)
 197                 return -EBUSY;
 198
 199         rc = hwrm_req_init(bp, req, 0 /* don't care */);
 200         if (rc)
 201                 return rc;
 202
 203         rc = hwrm_req_replace(bp, req, fw_msg->msg, fw_msg->msg_len);
 204         if (rc)
 205                 return rc;
 206
 207         hwrm_req_timeout(bp, req, fw_msg->timeout);
 208         resp = hwrm_req_hold(bp, req);
 209         rc = hwrm_req_send(bp, req);
 210         resp_len = le16_to_cpu(resp->resp_len);
 211         if (resp_len) {
 212                 if (fw_msg->resp_max_len < resp_len)
 213                         resp_len = fw_msg->resp_max_len;
 214
 215                 memcpy(fw_msg->resp, resp, resp_len);
 216         }
 217         hwrm_req_drop(bp, req);
 218         return rc;
 219 }
 220 EXPORT_SYMBOL(bnxt_send_msg);
 221
 222 void bnxt_ulp_stop(struct bnxt *bp)
 223 {
 224         struct bnxt_aux_priv *aux_priv = bp->aux_priv;
 225         struct bnxt_en_dev *edev = bp->edev;
 226
 227         if (!edev)
 228                 return;
 229
 230         mutex_lock(&edev->en_dev_lock);
 231         if (!bnxt_ulp_registered(edev)) {
 232                 mutex_unlock(&edev->en_dev_lock);
 233                 return;
 234         }
 235
 236         edev->flags |= BNXT_EN_FLAG_ULP_STOPPED;
 237         if (aux_priv) {
 238                 struct auxiliary_device *adev;
 239
 240                 adev = &aux_priv->aux_dev;
 241                 if (adev->dev.driver) {
 242                         const struct auxiliary_driver *adrv;
 243                         pm_message_t pm = {};
 244
 245                         adrv = to_auxiliary_drv(adev->dev.driver);
 246                         edev->en_state = bp->state;
 247                         adrv->suspend(adev, pm);
 248                 }
 249         }
 250         mutex_unlock(&edev->en_dev_lock);
 251 }
 252
 253 void bnxt_ulp_start(struct bnxt *bp, int err)
 254 {
 255         struct bnxt_aux_priv *aux_priv = bp->aux_priv;
 256         struct bnxt_en_dev *edev = bp->edev;
 257
 258         if (!edev)
 259                 return;
 260
 261         edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED;
 262
 263         if (err)
 264                 return;
 265
 266         mutex_lock(&edev->en_dev_lock);
 267         if (!bnxt_ulp_registered(edev)) {
 268                 mutex_unlock(&edev->en_dev_lock);
 269                 return;
 270         }
 271
 272         if (edev->ulp_tbl->msix_requested)
 273                 bnxt_fill_msix_vecs(bp, edev->msix_entries);
 274
 275         if (aux_priv) {
 276                 struct auxiliary_device *adev;
 277
 278                 adev = &aux_priv->aux_dev;
 279                 if (adev->dev.driver) {
 280                         const struct auxiliary_driver *adrv;
 281
 282                         adrv = to_auxiliary_drv(adev->dev.driver);
 283                         edev->en_state = bp->state;
 284                         adrv->resume(adev);
 285                 }
 286         }
 287         mutex_unlock(&edev->en_dev_lock);
 288 }
 289
 290 void bnxt_ulp_irq_stop(struct bnxt *bp)
 291 {
 292         struct bnxt_en_dev *edev = bp->edev;
 293         struct bnxt_ulp_ops *ops;
 294
 295         if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 296                 return;
 297
 298         if (bnxt_ulp_registered(bp->edev)) {
 299                 struct bnxt_ulp *ulp = edev->ulp_tbl;
 300
 301                 if (!ulp->msix_requested)
 302                         return;
 303
 304                 ops = rtnl_dereference(ulp->ulp_ops);
 305                 if (!ops || !ops->ulp_irq_stop)
 306                         return;
 307                 ops->ulp_irq_stop(ulp->handle);
 308         }
 309 }
 310
 311 void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
 312 {
 313         struct bnxt_en_dev *edev = bp->edev;
 314         struct bnxt_ulp_ops *ops;
 315
 316         if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 317                 return;
 318
 319         if (bnxt_ulp_registered(bp->edev)) {
 320                 struct bnxt_ulp *ulp = edev->ulp_tbl;
 321                 struct bnxt_msix_entry *ent = NULL;
 322
 323                 if (!ulp->msix_requested)
 324                         return;
 325
 326                 ops = rtnl_dereference(ulp->ulp_ops);
 327                 if (!ops || !ops->ulp_irq_restart)
 328                         return;
 329
 330                 if (!err) {
 331                         ent = kcalloc(ulp->msix_requested, sizeof(*ent),
 332                                       GFP_KERNEL);
 333                         if (!ent)
 334                                 return;
 335                         bnxt_fill_msix_vecs(bp, ent);
 336                 }
 337                 ops->ulp_irq_restart(ulp->handle, ent);
 338                 kfree(ent);
 339         }
 340 }
 341
 342 int bnxt_register_async_events(struct bnxt_en_dev *edev,
 343                                unsigned long *events_bmap,
 344                                u16 max_id)
 345 {
 346         struct net_device *dev = edev->net;
 347         struct bnxt *bp = netdev_priv(dev);
 348         struct bnxt_ulp *ulp;
 349
 350         ulp = edev->ulp_tbl;
 351         ulp->async_events_bmap = events_bmap;
 352         /* Make sure bnxt_ulp_async_events() sees this order */
 353         smp_wmb();
 354         ulp->max_async_event_id = max_id;
 355         bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true);
 356         return 0;
 357 }
 358 EXPORT_SYMBOL(bnxt_register_async_events);
 359
 360 void bnxt_rdma_aux_device_uninit(struct bnxt *bp)
 361 {
 362         struct bnxt_aux_priv *aux_priv;
 363         struct auxiliary_device *adev;
 364
 365         /* Skip if no auxiliary device init was done. */
 366         if (!bp->aux_priv)
 367                 return;
 368
 369         aux_priv = bp->aux_priv;
 370         adev = &aux_priv->aux_dev;
 371         auxiliary_device_uninit(adev);
 372 }
 373
 374 static void bnxt_aux_dev_release(struct device *dev)
 375 {
 376         struct bnxt_aux_priv *aux_priv =
 377                 container_of(dev, struct bnxt_aux_priv, aux_dev.dev);
 378         struct bnxt *bp = netdev_priv(aux_priv->edev->net);
 379
 380         ida_free(&bnxt_aux_dev_ids, aux_priv->id);
 381         kfree(aux_priv->edev->ulp_tbl);
 382         bp->edev = NULL;
 383         kfree(aux_priv->edev);
 384         kfree(aux_priv);
 385         bp->aux_priv = NULL;
 386 }
 387
 388 void bnxt_rdma_aux_device_del(struct bnxt *bp)
 389 {
 390         if (!bp->edev)
 391                 return;
 392
 393         auxiliary_device_delete(&bp->aux_priv->aux_dev);
 394 }
 395
 396 static void bnxt_set_edev_info(struct bnxt_en_dev *edev, struct bnxt *bp)
 397 {
 398         edev->net = bp->dev;
 399         edev->pdev = bp->pdev;
 400         edev->l2_db_size = bp->db_size;
 401         edev->l2_db_size_nc = bp->db_size;
 402         edev->l2_db_offset = bp->db_offset;
 403         mutex_init(&edev->en_dev_lock);
 404
 405         if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
 406                 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
 407         if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
 408                 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
 409         if (bp->flags & BNXT_FLAG_VF)
 410                 edev->flags |= BNXT_EN_FLAG_VF;
 411
 412         edev->chip_num = bp->chip_num;
 413         edev->hw_ring_stats_size = bp->hw_ring_stats_size;
 414         edev->pf_port_id = bp->pf.port_id;
 415         edev->en_state = bp->state;
 416         edev->bar0 = bp->bar0;
 417 }
 418
 419 void bnxt_rdma_aux_device_add(struct bnxt *bp)
 420 {
 421         struct auxiliary_device *aux_dev;
 422         int rc;
 423
 424         if (!bp->edev)
 425                 return;
 426
 427         aux_dev = &bp->aux_priv->aux_dev;
 428         rc = auxiliary_device_add(aux_dev);
 429         if (rc) {
 430                 netdev_warn(bp->dev, "Failed to add auxiliary device for ROCE\n");
 431                 auxiliary_device_uninit(aux_dev);
 432                 bp->flags &= ~BNXT_FLAG_ROCE_CAP;
 433         }
 434 }
 435
 436 void bnxt_rdma_aux_device_init(struct bnxt *bp)
 437 {
 438         struct auxiliary_device *aux_dev;
 439         struct bnxt_aux_priv *aux_priv;
 440         struct bnxt_en_dev *edev;
 441         struct bnxt_ulp *ulp;
 442         int rc;
 443
 444         if (!(bp->flags & BNXT_FLAG_ROCE_CAP))
 445                 return;
 446
 447         aux_priv = kzalloc(sizeof(*bp->aux_priv), GFP_KERNEL);
 448         if (!aux_priv)
 449                 goto exit;
 450
 451         aux_priv->id = ida_alloc(&bnxt_aux_dev_ids, GFP_KERNEL);
 452         if (aux_priv->id < 0) {
 453                 netdev_warn(bp->dev,
 454                             "ida alloc failed for ROCE auxiliary device\n");
 455                 kfree(aux_priv);
 456                 goto exit;
 457         }
 458
 459         aux_dev = &aux_priv->aux_dev;
 460         aux_dev->id = aux_priv->id;
 461         aux_dev->name = "rdma";
 462         aux_dev->dev.parent = &bp->pdev->dev;
 463         aux_dev->dev.release = bnxt_aux_dev_release;
 464
 465         rc = auxiliary_device_init(aux_dev);
 466         if (rc) {
 467                 ida_free(&bnxt_aux_dev_ids, aux_priv->id);
 468                 kfree(aux_priv);
 469                 goto exit;
 470         }
 471         bp->aux_priv = aux_priv;
 472
 473         /* From this point, all cleanup will happen via the .release callback &
 474          * any error unwinding will need to include a call to
 475          * auxiliary_device_uninit.
 476          */
 477         edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 478         if (!edev)
 479                 goto aux_dev_uninit;
 480
 481         aux_priv->edev = edev;
 482
 483         ulp = kzalloc(sizeof(*ulp), GFP_KERNEL);
 484         if (!ulp)
 485                 goto aux_dev_uninit;
 486
 487         edev->ulp_tbl = ulp;
 488         bp->edev = edev;
 489         bnxt_set_edev_info(edev, bp);
 490         bp->ulp_num_msix_want = bnxt_set_dflt_ulp_msix(bp);
 491
 492         return;
 493
 494 aux_dev_uninit:
 495         auxiliary_device_uninit(aux_dev);
 496 exit:
 497         bp->flags &= ~BNXT_FLAG_ROCE_CAP;
 498 }