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
  23 #include "bnxt_hsi.h"
  24 #include "bnxt.h"
  25 #include "bnxt_ulp.h"
  26
  27 static int bnxt_register_dev(struct bnxt_en_dev *edev, int ulp_id,
  28                              struct bnxt_ulp_ops *ulp_ops, void *handle)
  29 {
  30         struct net_device *dev = edev->net;
  31         struct bnxt *bp = netdev_priv(dev);
  32         struct bnxt_ulp *ulp;
  33
  34         ASSERT_RTNL();
  35         if (ulp_id >= BNXT_MAX_ULP)
  36                 return -EINVAL;
  37
  38         ulp = &edev->ulp_tbl[ulp_id];
  39         if (rcu_access_pointer(ulp->ulp_ops)) {
  40                 netdev_err(bp->dev, "ulp id %d already registered\n", ulp_id);
  41                 return -EBUSY;
  42         }
  43         if (ulp_id == BNXT_ROCE_ULP) {
  44                 unsigned int max_stat_ctxs;
  45
  46                 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
  47                 if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS ||
  48                     bp->num_stat_ctxs == max_stat_ctxs)
  49                         return -ENOMEM;
  50                 bnxt_set_max_func_stat_ctxs(bp, max_stat_ctxs -
  51                                             BNXT_MIN_ROCE_STAT_CTXS);
  52         }
  53
  54         atomic_set(&ulp->ref_count, 0);
  55         ulp->handle = handle;
  56         rcu_assign_pointer(ulp->ulp_ops, ulp_ops);
  57
  58         if (ulp_id == BNXT_ROCE_ULP) {
  59                 if (test_bit(BNXT_STATE_OPEN, &bp->state))
  60                         bnxt_hwrm_vnic_cfg(bp, 0);
  61         }
  62
  63         return 0;
  64 }
  65
  66 static int bnxt_unregister_dev(struct bnxt_en_dev *edev, int ulp_id)
  67 {
  68         struct net_device *dev = edev->net;
  69         struct bnxt *bp = netdev_priv(dev);
  70         struct bnxt_ulp *ulp;
  71         int i = 0;
  72
  73         ASSERT_RTNL();
  74         if (ulp_id >= BNXT_MAX_ULP)
  75                 return -EINVAL;
  76
  77         ulp = &edev->ulp_tbl[ulp_id];
  78         if (!rcu_access_pointer(ulp->ulp_ops)) {
  79                 netdev_err(bp->dev, "ulp id %d not registered\n", ulp_id);
  80                 return -EINVAL;
  81         }
  82         if (ulp_id == BNXT_ROCE_ULP) {
  83                 unsigned int max_stat_ctxs;
  84
  85                 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
  86                 bnxt_set_max_func_stat_ctxs(bp, max_stat_ctxs + 1);
  87                 if (ulp->msix_requested)
  88                         edev->en_ops->bnxt_free_msix(edev, ulp_id);
  89         }
  90         if (ulp->max_async_event_id)
  91                 bnxt_hwrm_func_rgtr_async_events(bp, NULL, 0);
  92
  93         RCU_INIT_POINTER(ulp->ulp_ops, NULL);
  94         synchronize_rcu();
  95         ulp->max_async_event_id = 0;
  96         ulp->async_events_bmap = NULL;
  97         while (atomic_read(&ulp->ref_count) != 0 && i < 10) {
  98                 msleep(100);
  99                 i++;
 100         }
 101         return 0;
 102 }
 103
 104 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent)
 105 {
 106         struct bnxt_en_dev *edev = bp->edev;
 107         int num_msix, idx, i;
 108
 109         num_msix = edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
 110         idx = edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
 111         for (i = 0; i < num_msix; i++) {
 112                 ent[i].vector = bp->irq_tbl[idx + i].vector;
 113                 ent[i].ring_idx = idx + i;
 114                 ent[i].db_offset = (idx + i) * 0x80;
 115         }
 116 }
 117
 118 static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id,
 119                               struct bnxt_msix_entry *ent, int num_msix)
 120 {
 121         struct net_device *dev = edev->net;
 122         struct bnxt *bp = netdev_priv(dev);
 123         int max_idx, max_cp_rings;
 124         int avail_msix, idx;
 125         int rc = 0;
 126
 127         ASSERT_RTNL();
 128         if (ulp_id != BNXT_ROCE_ULP)
 129                 return -EINVAL;
 130
 131         if (!(bp->flags & BNXT_FLAG_USING_MSIX))
 132                 return -ENODEV;
 133
 134         if (edev->ulp_tbl[ulp_id].msix_requested)
 135                 return -EAGAIN;
 136
 137         max_cp_rings = bnxt_get_max_func_cp_rings(bp);
 138         avail_msix = bnxt_get_avail_msix(bp, num_msix);
 139         if (!avail_msix)
 140                 return -ENOMEM;
 141         if (avail_msix > num_msix)
 142                 avail_msix = num_msix;
 143
 144         if (bp->flags & BNXT_FLAG_NEW_RM) {
 145                 idx = bp->cp_nr_rings;
 146         } else {
 147                 max_idx = min_t(int, bp->total_irqs, max_cp_rings);
 148                 idx = max_idx - avail_msix;
 149         }
 150         edev->ulp_tbl[ulp_id].msix_base = idx;
 151         edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
 152         if (bp->total_irqs < (idx + avail_msix)) {
 153                 if (netif_running(dev)) {
 154                         bnxt_close_nic(bp, true, false);
 155                         rc = bnxt_open_nic(bp, true, false);
 156                 } else {
 157                         rc = bnxt_reserve_rings(bp);
 158                 }
 159         }
 160         if (rc) {
 161                 edev->ulp_tbl[ulp_id].msix_requested = 0;
 162                 return -EAGAIN;
 163         }
 164
 165         if (bp->flags & BNXT_FLAG_NEW_RM) {
 166                 struct bnxt_hw_resc *hw_resc = &bp->hw_resc;
 167
 168                 avail_msix = hw_resc->resv_cp_rings - bp->cp_nr_rings;
 169                 edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
 170         }
 171         bnxt_fill_msix_vecs(bp, ent);
 172         bnxt_set_max_func_irqs(bp, bnxt_get_max_func_irqs(bp) - avail_msix);
 173         bnxt_set_max_func_cp_rings(bp, max_cp_rings - avail_msix);
 174         edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
 175         return avail_msix;
 176 }
 177
 178 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)
 179 {
 180         struct net_device *dev = edev->net;
 181         struct bnxt *bp = netdev_priv(dev);
 182         int max_cp_rings, msix_requested;
 183
 184         ASSERT_RTNL();
 185         if (ulp_id != BNXT_ROCE_ULP)
 186                 return -EINVAL;
 187
 188         if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 189                 return 0;
 190
 191         max_cp_rings = bnxt_get_max_func_cp_rings(bp);
 192         msix_requested = edev->ulp_tbl[ulp_id].msix_requested;
 193         bnxt_set_max_func_cp_rings(bp, max_cp_rings + msix_requested);
 194         edev->ulp_tbl[ulp_id].msix_requested = 0;
 195         bnxt_set_max_func_irqs(bp, bnxt_get_max_func_irqs(bp) + msix_requested);
 196         edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
 197         if (netif_running(dev)) {
 198                 bnxt_close_nic(bp, true, false);
 199                 bnxt_open_nic(bp, true, false);
 200         }
 201         return 0;
 202 }
 203
 204 int bnxt_get_ulp_msix_num(struct bnxt *bp)
 205 {
 206         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 207                 struct bnxt_en_dev *edev = bp->edev;
 208
 209                 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
 210         }
 211         return 0;
 212 }
 213
 214 int bnxt_get_ulp_msix_base(struct bnxt *bp)
 215 {
 216         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 217                 struct bnxt_en_dev *edev = bp->edev;
 218
 219                 if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested)
 220                         return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
 221         }
 222         return 0;
 223 }
 224
 225 void bnxt_subtract_ulp_resources(struct bnxt *bp, int ulp_id)
 226 {
 227         ASSERT_RTNL();
 228         if (bnxt_ulp_registered(bp->edev, ulp_id)) {
 229                 struct bnxt_en_dev *edev = bp->edev;
 230                 unsigned int msix_req, max;
 231
 232                 msix_req = edev->ulp_tbl[ulp_id].msix_requested;
 233                 max = bnxt_get_max_func_cp_rings(bp);
 234                 bnxt_set_max_func_cp_rings(bp, max - msix_req);
 235                 max = bnxt_get_max_func_stat_ctxs(bp);
 236                 bnxt_set_max_func_stat_ctxs(bp, max - 1);
 237         }
 238 }
 239
 240 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id,
 241                          struct bnxt_fw_msg *fw_msg)
 242 {
 243         struct net_device *dev = edev->net;
 244         struct bnxt *bp = netdev_priv(dev);
 245         struct input *req;
 246         int rc;
 247
 248         mutex_lock(&bp->hwrm_cmd_lock);
 249         req = fw_msg->msg;
 250         req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
 251         rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len,
 252                                 fw_msg->timeout);
 253         if (!rc) {
 254                 struct output *resp = bp->hwrm_cmd_resp_addr;
 255                 u32 len = le16_to_cpu(resp->resp_len);
 256
 257                 if (fw_msg->resp_max_len < len)
 258                         len = fw_msg->resp_max_len;
 259
 260                 memcpy(fw_msg->resp, resp, len);
 261         }
 262         mutex_unlock(&bp->hwrm_cmd_lock);
 263         return rc;
 264 }
 265
 266 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
 267 {
 268         atomic_inc(&ulp->ref_count);
 269 }
 270
 271 static void bnxt_ulp_put(struct bnxt_ulp *ulp)
 272 {
 273         atomic_dec(&ulp->ref_count);
 274 }
 275
 276 void bnxt_ulp_stop(struct bnxt *bp)
 277 {
 278         struct bnxt_en_dev *edev = bp->edev;
 279         struct bnxt_ulp_ops *ops;
 280         int i;
 281
 282         if (!edev)
 283                 return;
 284
 285         for (i = 0; i < BNXT_MAX_ULP; i++) {
 286                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 287
 288                 ops = rtnl_dereference(ulp->ulp_ops);
 289                 if (!ops || !ops->ulp_stop)
 290                         continue;
 291                 ops->ulp_stop(ulp->handle);
 292         }
 293 }
 294
 295 void bnxt_ulp_start(struct bnxt *bp)
 296 {
 297         struct bnxt_en_dev *edev = bp->edev;
 298         struct bnxt_ulp_ops *ops;
 299         int i;
 300
 301         if (!edev)
 302                 return;
 303
 304         for (i = 0; i < BNXT_MAX_ULP; i++) {
 305                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 306
 307                 ops = rtnl_dereference(ulp->ulp_ops);
 308                 if (!ops || !ops->ulp_start)
 309                         continue;
 310                 ops->ulp_start(ulp->handle);
 311         }
 312 }
 313
 314 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
 315 {
 316         struct bnxt_en_dev *edev = bp->edev;
 317         struct bnxt_ulp_ops *ops;
 318         int i;
 319
 320         if (!edev)
 321                 return;
 322
 323         for (i = 0; i < BNXT_MAX_ULP; i++) {
 324                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 325
 326                 rcu_read_lock();
 327                 ops = rcu_dereference(ulp->ulp_ops);
 328                 if (!ops || !ops->ulp_sriov_config) {
 329                         rcu_read_unlock();
 330                         continue;
 331                 }
 332                 bnxt_ulp_get(ulp);
 333                 rcu_read_unlock();
 334                 ops->ulp_sriov_config(ulp->handle, num_vfs);
 335                 bnxt_ulp_put(ulp);
 336         }
 337 }
 338
 339 void bnxt_ulp_shutdown(struct bnxt *bp)
 340 {
 341         struct bnxt_en_dev *edev = bp->edev;
 342         struct bnxt_ulp_ops *ops;
 343         int i;
 344
 345         if (!edev)
 346                 return;
 347
 348         for (i = 0; i < BNXT_MAX_ULP; i++) {
 349                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 350
 351                 ops = rtnl_dereference(ulp->ulp_ops);
 352                 if (!ops || !ops->ulp_shutdown)
 353                         continue;
 354                 ops->ulp_shutdown(ulp->handle);
 355         }
 356 }
 357
 358 void bnxt_ulp_irq_stop(struct bnxt *bp)
 359 {
 360         struct bnxt_en_dev *edev = bp->edev;
 361         struct bnxt_ulp_ops *ops;
 362
 363         if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 364                 return;
 365
 366         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 367                 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
 368
 369                 if (!ulp->msix_requested)
 370                         return;
 371
 372                 ops = rtnl_dereference(ulp->ulp_ops);
 373                 if (!ops || !ops->ulp_irq_stop)
 374                         return;
 375                 ops->ulp_irq_stop(ulp->handle);
 376         }
 377 }
 378
 379 void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
 380 {
 381         struct bnxt_en_dev *edev = bp->edev;
 382         struct bnxt_ulp_ops *ops;
 383
 384         if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 385                 return;
 386
 387         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 388                 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
 389                 struct bnxt_msix_entry *ent = NULL;
 390
 391                 if (!ulp->msix_requested)
 392                         return;
 393
 394                 ops = rtnl_dereference(ulp->ulp_ops);
 395                 if (!ops || !ops->ulp_irq_restart)
 396                         return;
 397
 398                 if (!err) {
 399                         ent = kcalloc(ulp->msix_requested, sizeof(*ent),
 400                                       GFP_KERNEL);
 401                         if (!ent)
 402                                 return;
 403                         bnxt_fill_msix_vecs(bp, ent);
 404                 }
 405                 ops->ulp_irq_restart(ulp->handle, ent);
 406                 kfree(ent);
 407         }
 408 }
 409
 410 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
 411 {
 412         u16 event_id = le16_to_cpu(cmpl->event_id);
 413         struct bnxt_en_dev *edev = bp->edev;
 414         struct bnxt_ulp_ops *ops;
 415         int i;
 416
 417         if (!edev)
 418                 return;
 419
 420         rcu_read_lock();
 421         for (i = 0; i < BNXT_MAX_ULP; i++) {
 422                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 423
 424                 ops = rcu_dereference(ulp->ulp_ops);
 425                 if (!ops || !ops->ulp_async_notifier)
 426                         continue;
 427                 if (!ulp->async_events_bmap ||
 428                     event_id > ulp->max_async_event_id)
 429                         continue;
 430
 431                 /* Read max_async_event_id first before testing the bitmap. */
 432                 smp_rmb();
 433                 if (test_bit(event_id, ulp->async_events_bmap))
 434                         ops->ulp_async_notifier(ulp->handle, cmpl);
 435         }
 436         rcu_read_unlock();
 437 }
 438
 439 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id,
 440                                       unsigned long *events_bmap, u16 max_id)
 441 {
 442         struct net_device *dev = edev->net;
 443         struct bnxt *bp = netdev_priv(dev);
 444         struct bnxt_ulp *ulp;
 445
 446         if (ulp_id >= BNXT_MAX_ULP)
 447                 return -EINVAL;
 448
 449         ulp = &edev->ulp_tbl[ulp_id];
 450         ulp->async_events_bmap = events_bmap;
 451         /* Make sure bnxt_ulp_async_events() sees this order */
 452         smp_wmb();
 453         ulp->max_async_event_id = max_id;
 454         bnxt_hwrm_func_rgtr_async_events(bp, events_bmap, max_id + 1);
 455         return 0;
 456 }
 457
 458 static const struct bnxt_en_ops bnxt_en_ops_tbl = {
 459         .bnxt_register_device   = bnxt_register_dev,
 460         .bnxt_unregister_device = bnxt_unregister_dev,
 461         .bnxt_request_msix      = bnxt_req_msix_vecs,
 462         .bnxt_free_msix         = bnxt_free_msix_vecs,
 463         .bnxt_send_fw_msg       = bnxt_send_msg,
 464         .bnxt_register_fw_async_events  = bnxt_register_async_events,
 465 };
 466
 467 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev)
 468 {
 469         struct bnxt *bp = netdev_priv(dev);
 470         struct bnxt_en_dev *edev;
 471
 472         edev = bp->edev;
 473         if (!edev) {
 474                 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 475                 if (!edev)
 476                         return ERR_PTR(-ENOMEM);
 477                 edev->en_ops = &bnxt_en_ops_tbl;
 478                 if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
 479                         edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
 480                 if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
 481                         edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
 482                 edev->net = dev;
 483                 edev->pdev = bp->pdev;
 484                 bp->edev = edev;
 485         }
 486         return bp->edev;
 487 }