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         int roce_msix = BNXT_MAX_ROCE_MSIX;
 180
 181         if (BNXT_VF(bp))
 182                 roce_msix = BNXT_MAX_ROCE_MSIX_VF;
 183         else if (bp->port_partition_type)
 184                 roce_msix = BNXT_MAX_ROCE_MSIX_NPAR_PF;
 185
 186         /* NQ MSIX vectors should match the number of CPUs plus 1 more for
 187          * the CREQ MSIX, up to the default.
 188          */
 189         return min_t(int, roce_msix, num_online_cpus() + 1);
 190 }
 191
 192 int bnxt_send_msg(struct bnxt_en_dev *edev,
 193                          struct bnxt_fw_msg *fw_msg)
 194 {
 195         struct net_device *dev = edev->net;
 196         struct bnxt *bp = netdev_priv(dev);
 197         struct output *resp;
 198         struct input *req;
 199         u32 resp_len;
 200         int rc;
 201
 202         if (bp->fw_reset_state)
 203                 return -EBUSY;
 204
 205         rc = hwrm_req_init(bp, req, 0 /* don't care */);
 206         if (rc)
 207                 return rc;
 208
 209         rc = hwrm_req_replace(bp, req, fw_msg->msg, fw_msg->msg_len);
 210         if (rc)
 211                 return rc;
 212
 213         hwrm_req_timeout(bp, req, fw_msg->timeout);
 214         resp = hwrm_req_hold(bp, req);
 215         rc = hwrm_req_send(bp, req);
 216         resp_len = le16_to_cpu(resp->resp_len);
 217         if (resp_len) {
 218                 if (fw_msg->resp_max_len < resp_len)
 219                         resp_len = fw_msg->resp_max_len;
 220
 221                 memcpy(fw_msg->resp, resp, resp_len);
 222         }
 223         hwrm_req_drop(bp, req);
 224         return rc;
 225 }
 226 EXPORT_SYMBOL(bnxt_send_msg);
 227
 228 void bnxt_ulp_stop(struct bnxt *bp)
 229 {
 230         struct bnxt_aux_priv *aux_priv = bp->aux_priv;
 231         struct bnxt_en_dev *edev = bp->edev;
 232
 233         if (!edev)
 234                 return;
 235
 236         mutex_lock(&edev->en_dev_lock);
 237         if (!bnxt_ulp_registered(edev)) {
 238                 mutex_unlock(&edev->en_dev_lock);
 239                 return;
 240         }
 241
 242         edev->flags |= BNXT_EN_FLAG_ULP_STOPPED;
 243         if (aux_priv) {
 244                 struct auxiliary_device *adev;
 245
 246                 adev = &aux_priv->aux_dev;
 247                 if (adev->dev.driver) {
 248                         const struct auxiliary_driver *adrv;
 249                         pm_message_t pm = {};
 250
 251                         adrv = to_auxiliary_drv(adev->dev.driver);
 252                         edev->en_state = bp->state;
 253                         adrv->suspend(adev, pm);
 254                 }
 255         }
 256         mutex_unlock(&edev->en_dev_lock);
 257 }
 258
 259 void bnxt_ulp_start(struct bnxt *bp, int err)
 260 {
 261         struct bnxt_aux_priv *aux_priv = bp->aux_priv;
 262         struct bnxt_en_dev *edev = bp->edev;
 263
 264         if (!edev)
 265                 return;
 266
 267         edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED;
 268
 269         if (err)
 270                 return;
 271
 272         mutex_lock(&edev->en_dev_lock);
 273         if (!bnxt_ulp_registered(edev)) {
 274                 mutex_unlock(&edev->en_dev_lock);
 275                 return;
 276         }
 277
 278         if (edev->ulp_tbl->msix_requested)
 279                 bnxt_fill_msix_vecs(bp, edev->msix_entries);
 280
 281         if (aux_priv) {
 282                 struct auxiliary_device *adev;
 283
 284                 adev = &aux_priv->aux_dev;
 285                 if (adev->dev.driver) {
 286                         const struct auxiliary_driver *adrv;
 287
 288                         adrv = to_auxiliary_drv(adev->dev.driver);
 289                         edev->en_state = bp->state;
 290                         adrv->resume(adev);
 291                 }
 292         }
 293         mutex_unlock(&edev->en_dev_lock);
 294 }
 295
 296 void bnxt_ulp_irq_stop(struct bnxt *bp)
 297 {
 298         struct bnxt_en_dev *edev = bp->edev;
 299         struct bnxt_ulp_ops *ops;
 300
 301         if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 302                 return;
 303
 304         if (bnxt_ulp_registered(bp->edev)) {
 305                 struct bnxt_ulp *ulp = edev->ulp_tbl;
 306
 307                 if (!ulp->msix_requested)
 308                         return;
 309
 310                 ops = rtnl_dereference(ulp->ulp_ops);
 311                 if (!ops || !ops->ulp_irq_stop)
 312                         return;
 313                 ops->ulp_irq_stop(ulp->handle);
 314         }
 315 }
 316
 317 void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
 318 {
 319         struct bnxt_en_dev *edev = bp->edev;
 320         struct bnxt_ulp_ops *ops;
 321
 322         if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 323                 return;
 324
 325         if (bnxt_ulp_registered(bp->edev)) {
 326                 struct bnxt_ulp *ulp = edev->ulp_tbl;
 327                 struct bnxt_msix_entry *ent = NULL;
 328
 329                 if (!ulp->msix_requested)
 330                         return;
 331
 332                 ops = rtnl_dereference(ulp->ulp_ops);
 333                 if (!ops || !ops->ulp_irq_restart)
 334                         return;
 335
 336                 if (!err) {
 337                         ent = kcalloc(ulp->msix_requested, sizeof(*ent),
 338                                       GFP_KERNEL);
 339                         if (!ent)
 340                                 return;
 341                         bnxt_fill_msix_vecs(bp, ent);
 342                 }
 343                 ops->ulp_irq_restart(ulp->handle, ent);
 344                 kfree(ent);
 345         }
 346 }
 347
 348 int bnxt_register_async_events(struct bnxt_en_dev *edev,
 349                                unsigned long *events_bmap,
 350                                u16 max_id)
 351 {
 352         struct net_device *dev = edev->net;
 353         struct bnxt *bp = netdev_priv(dev);
 354         struct bnxt_ulp *ulp;
 355
 356         ulp = edev->ulp_tbl;
 357         ulp->async_events_bmap = events_bmap;
 358         /* Make sure bnxt_ulp_async_events() sees this order */
 359         smp_wmb();
 360         ulp->max_async_event_id = max_id;
 361         bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true);
 362         return 0;
 363 }
 364 EXPORT_SYMBOL(bnxt_register_async_events);
 365
 366 void bnxt_rdma_aux_device_uninit(struct bnxt *bp)
 367 {
 368         struct bnxt_aux_priv *aux_priv;
 369         struct auxiliary_device *adev;
 370
 371         /* Skip if no auxiliary device init was done. */
 372         if (!bp->aux_priv)
 373                 return;
 374
 375         aux_priv = bp->aux_priv;
 376         adev = &aux_priv->aux_dev;
 377         auxiliary_device_uninit(adev);
 378 }
 379
 380 static void bnxt_aux_dev_release(struct device *dev)
 381 {
 382         struct bnxt_aux_priv *aux_priv =
 383                 container_of(dev, struct bnxt_aux_priv, aux_dev.dev);
 384         struct bnxt *bp = netdev_priv(aux_priv->edev->net);
 385
 386         ida_free(&bnxt_aux_dev_ids, aux_priv->id);
 387         kfree(aux_priv->edev->ulp_tbl);
 388         bp->edev = NULL;
 389         kfree(aux_priv->edev);
 390         kfree(aux_priv);
 391         bp->aux_priv = NULL;
 392 }
 393
 394 void bnxt_rdma_aux_device_del(struct bnxt *bp)
 395 {
 396         if (!bp->edev)
 397                 return;
 398
 399         auxiliary_device_delete(&bp->aux_priv->aux_dev);
 400 }
 401
 402 static void bnxt_set_edev_info(struct bnxt_en_dev *edev, struct bnxt *bp)
 403 {
 404         edev->net = bp->dev;
 405         edev->pdev = bp->pdev;
 406         edev->l2_db_size = bp->db_size;
 407         edev->l2_db_size_nc = bp->db_size;
 408         edev->l2_db_offset = bp->db_offset;
 409         mutex_init(&edev->en_dev_lock);
 410
 411         if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
 412                 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
 413         if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
 414                 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
 415         if (bp->flags & BNXT_FLAG_VF)
 416                 edev->flags |= BNXT_EN_FLAG_VF;
 417         if (BNXT_ROCE_VF_RESC_CAP(bp))
 418                 edev->flags |= BNXT_EN_FLAG_ROCE_VF_RES_MGMT;
 419
 420         edev->chip_num = bp->chip_num;
 421         edev->hw_ring_stats_size = bp->hw_ring_stats_size;
 422         edev->pf_port_id = bp->pf.port_id;
 423         edev->en_state = bp->state;
 424         edev->bar0 = bp->bar0;
 425 }
 426
 427 void bnxt_rdma_aux_device_add(struct bnxt *bp)
 428 {
 429         struct auxiliary_device *aux_dev;
 430         int rc;
 431
 432         if (!bp->edev)
 433                 return;
 434
 435         aux_dev = &bp->aux_priv->aux_dev;
 436         rc = auxiliary_device_add(aux_dev);
 437         if (rc) {
 438                 netdev_warn(bp->dev, "Failed to add auxiliary device for ROCE\n");
 439                 auxiliary_device_uninit(aux_dev);
 440                 bp->flags &= ~BNXT_FLAG_ROCE_CAP;
 441         }
 442 }
 443
 444 void bnxt_rdma_aux_device_init(struct bnxt *bp)
 445 {
 446         struct auxiliary_device *aux_dev;
 447         struct bnxt_aux_priv *aux_priv;
 448         struct bnxt_en_dev *edev;
 449         struct bnxt_ulp *ulp;
 450         int rc;
 451
 452         if (!(bp->flags & BNXT_FLAG_ROCE_CAP))
 453                 return;
 454
 455         aux_priv = kzalloc(sizeof(*bp->aux_priv), GFP_KERNEL);
 456         if (!aux_priv)
 457                 goto exit;
 458
 459         aux_priv->id = ida_alloc(&bnxt_aux_dev_ids, GFP_KERNEL);
 460         if (aux_priv->id < 0) {
 461                 netdev_warn(bp->dev,
 462                             "ida alloc failed for ROCE auxiliary device\n");
 463                 kfree(aux_priv);
 464                 goto exit;
 465         }
 466
 467         aux_dev = &aux_priv->aux_dev;
 468         aux_dev->id = aux_priv->id;
 469         aux_dev->name = "rdma";
 470         aux_dev->dev.parent = &bp->pdev->dev;
 471         aux_dev->dev.release = bnxt_aux_dev_release;
 472
 473         rc = auxiliary_device_init(aux_dev);
 474         if (rc) {
 475                 ida_free(&bnxt_aux_dev_ids, aux_priv->id);
 476                 kfree(aux_priv);
 477                 goto exit;
 478         }
 479         bp->aux_priv = aux_priv;
 480
 481         /* From this point, all cleanup will happen via the .release callback &
 482          * any error unwinding will need to include a call to
 483          * auxiliary_device_uninit.
 484          */
 485         edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 486         if (!edev)
 487                 goto aux_dev_uninit;
 488
 489         aux_priv->edev = edev;
 490
 491         ulp = kzalloc(sizeof(*ulp), GFP_KERNEL);
 492         if (!ulp)
 493                 goto aux_dev_uninit;
 494
 495         edev->ulp_tbl = ulp;
 496         bp->edev = edev;
 497         bnxt_set_edev_info(edev, bp);
 498         bp->ulp_num_msix_want = bnxt_set_dflt_ulp_msix(bp);
 499
 500         return;
 501
 502 aux_dev_uninit:
 503         auxiliary_device_uninit(aux_dev);
 504 exit:
 505         bp->flags &= ~BNXT_FLAG_ROCE_CAP;
 506 }