drivers/vdpa/ifcvf/ifcvf_main.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Intel IFC VF NIC driver for virtio dataplane offloading
   4  *
   5  * Copyright (C) 2020 Intel Corporation.
   6  *
   7  * Author: Zhu Lingshan <lingshan.zhu@intel.com>
   8  *
   9  */
  10
  11 #include <linux/interrupt.h>
  12 #include <linux/module.h>
  13 #include <linux/pci.h>
  14 #include <linux/sysfs.h>
  15 #include "ifcvf_base.h"
  16
  17 #define DRIVER_AUTHOR   "Intel Corporation"
  18 #define IFCVF_DRIVER_NAME       "ifcvf"
  19
  20 static irqreturn_t ifcvf_config_changed(int irq, void *arg)
  21 {
  22         struct ifcvf_hw *vf = arg;
  23
  24         if (vf->config_cb.callback)
  25                 return vf->config_cb.callback(vf->config_cb.private);
  26
  27         return IRQ_HANDLED;
  28 }
  29
  30 static irqreturn_t ifcvf_intr_handler(int irq, void *arg)
  31 {
  32         struct vring_info *vring = arg;
  33
  34         if (vring->cb.callback)
  35                 return vring->cb.callback(vring->cb.private);
  36
  37         return IRQ_HANDLED;
  38 }
  39
  40 static void ifcvf_free_irq_vectors(void *data)
  41 {
  42         pci_free_irq_vectors(data);
  43 }
  44
  45 static void ifcvf_free_irq(struct ifcvf_adapter *adapter, int queues)
  46 {
  47         struct pci_dev *pdev = adapter->pdev;
  48         struct ifcvf_hw *vf = &adapter->vf;
  49         int i;
  50
  51
  52         for (i = 0; i < queues; i++) {
  53                 devm_free_irq(&pdev->dev, vf->vring[i].irq, &vf->vring[i]);
  54                 vf->vring[i].irq = -EINVAL;
  55         }
  56
  57         devm_free_irq(&pdev->dev, vf->config_irq, vf);
  58         ifcvf_free_irq_vectors(pdev);
  59 }
  60
  61 static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
  62 {
  63         struct pci_dev *pdev = adapter->pdev;
  64         struct ifcvf_hw *vf = &adapter->vf;
  65         int vector, i, ret, irq;
  66
  67         ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR,
  68                                     IFCVF_MAX_INTR, PCI_IRQ_MSIX);
  69         if (ret < 0) {
  70                 IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n");
  71                 return ret;
  72         }
  73
  74         snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
  75                  pci_name(pdev));
  76         vector = 0;
  77         vf->config_irq = pci_irq_vector(pdev, vector);
  78         ret = devm_request_irq(&pdev->dev, vf->config_irq,
  79                                ifcvf_config_changed, 0,
  80                                vf->config_msix_name, vf);
  81         if (ret) {
  82                 IFCVF_ERR(pdev, "Failed to request config irq\n");
  83                 return ret;
  84         }
  85
  86         for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
  87                 snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
  88                          pci_name(pdev), i);
  89                 vector = i + IFCVF_MSI_QUEUE_OFF;
  90                 irq = pci_irq_vector(pdev, vector);
  91                 ret = devm_request_irq(&pdev->dev, irq,
  92                                        ifcvf_intr_handler, 0,
  93                                        vf->vring[i].msix_name,
  94                                        &vf->vring[i]);
  95                 if (ret) {
  96                         IFCVF_ERR(pdev,
  97                                   "Failed to request irq for vq %d\n", i);
  98                         ifcvf_free_irq(adapter, i);
  99
 100                         return ret;
 101                 }
 102
 103                 vf->vring[i].irq = irq;
 104         }
 105
 106         return 0;
 107 }
 108
 109 static int ifcvf_start_datapath(void *private)
 110 {
 111         struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
 112         u8 status;
 113         int ret;
 114
 115         vf->nr_vring = IFCVF_MAX_QUEUE_PAIRS * 2;
 116         ret = ifcvf_start_hw(vf);
 117         if (ret < 0) {
 118                 status = ifcvf_get_status(vf);
 119                 status |= VIRTIO_CONFIG_S_FAILED;
 120                 ifcvf_set_status(vf, status);
 121         }
 122
 123         return ret;
 124 }
 125
 126 static int ifcvf_stop_datapath(void *private)
 127 {
 128         struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
 129         int i;
 130
 131         for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
 132                 vf->vring[i].cb.callback = NULL;
 133
 134         ifcvf_stop_hw(vf);
 135
 136         return 0;
 137 }
 138
 139 static void ifcvf_reset_vring(struct ifcvf_adapter *adapter)
 140 {
 141         struct ifcvf_hw *vf = ifcvf_private_to_vf(adapter);
 142         int i;
 143
 144         for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
 145                 vf->vring[i].last_avail_idx = 0;
 146                 vf->vring[i].desc = 0;
 147                 vf->vring[i].avail = 0;
 148                 vf->vring[i].used = 0;
 149                 vf->vring[i].ready = 0;
 150                 vf->vring[i].cb.callback = NULL;
 151                 vf->vring[i].cb.private = NULL;
 152         }
 153
 154         ifcvf_reset(vf);
 155 }
 156
 157 static struct ifcvf_adapter *vdpa_to_adapter(struct vdpa_device *vdpa_dev)
 158 {
 159         return container_of(vdpa_dev, struct ifcvf_adapter, vdpa);
 160 }
 161
 162 static struct ifcvf_hw *vdpa_to_vf(struct vdpa_device *vdpa_dev)
 163 {
 164         struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
 165
 166         return &adapter->vf;
 167 }
 168
 169 static u64 ifcvf_vdpa_get_features(struct vdpa_device *vdpa_dev)
 170 {
 171         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 172         u64 features;
 173
 174         features = ifcvf_get_features(vf) & IFCVF_SUPPORTED_FEATURES;
 175
 176         return features;
 177 }
 178
 179 static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev, u64 features)
 180 {
 181         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 182         int ret;
 183
 184         ret = ifcvf_verify_min_features(vf, features);
 185         if (ret)
 186                 return ret;
 187
 188         vf->req_features = features;
 189
 190         return 0;
 191 }
 192
 193 static u8 ifcvf_vdpa_get_status(struct vdpa_device *vdpa_dev)
 194 {
 195         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 196
 197         return ifcvf_get_status(vf);
 198 }
 199
 200 static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
 201 {
 202         struct ifcvf_adapter *adapter;
 203         struct ifcvf_hw *vf;
 204         u8 status_old;
 205         int ret;
 206
 207         vf  = vdpa_to_vf(vdpa_dev);
 208         adapter = dev_get_drvdata(vdpa_dev->dev.parent);
 209         status_old = ifcvf_get_status(vf);
 210
 211         if (status_old == status)
 212                 return;
 213
 214         if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) &&
 215             !(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 216                 ifcvf_stop_datapath(adapter);
 217                 ifcvf_free_irq(adapter, IFCVF_MAX_QUEUE_PAIRS * 2);
 218         }
 219
 220         if (status == 0) {
 221                 ifcvf_reset_vring(adapter);
 222                 return;
 223         }
 224
 225         if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
 226             !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) {
 227                 ret = ifcvf_request_irq(adapter);
 228                 if (ret) {
 229                         status = ifcvf_get_status(vf);
 230                         status |= VIRTIO_CONFIG_S_FAILED;
 231                         ifcvf_set_status(vf, status);
 232                         return;
 233                 }
 234
 235                 if (ifcvf_start_datapath(adapter) < 0)
 236                         IFCVF_ERR(adapter->pdev,
 237                                   "Failed to set ifcvf vdpa  status %u\n",
 238                                   status);
 239         }
 240
 241         ifcvf_set_status(vf, status);
 242 }
 243
 244 static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
 245 {
 246         return IFCVF_QUEUE_MAX;
 247 }
 248
 249 static int ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
 250                                    struct vdpa_vq_state *state)
 251 {
 252         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 253
 254         state->avail_index = ifcvf_get_vq_state(vf, qid);
 255         return 0;
 256 }
 257
 258 static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
 259                                    const struct vdpa_vq_state *state)
 260 {
 261         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 262
 263         return ifcvf_set_vq_state(vf, qid, state->avail_index);
 264 }
 265
 266 static void ifcvf_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
 267                                  struct vdpa_callback *cb)
 268 {
 269         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 270
 271         vf->vring[qid].cb = *cb;
 272 }
 273
 274 static void ifcvf_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev,
 275                                     u16 qid, bool ready)
 276 {
 277         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 278
 279         vf->vring[qid].ready = ready;
 280 }
 281
 282 static bool ifcvf_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
 283 {
 284         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 285
 286         return vf->vring[qid].ready;
 287 }
 288
 289 static void ifcvf_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid,
 290                                   u32 num)
 291 {
 292         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 293
 294         vf->vring[qid].size = num;
 295 }
 296
 297 static int ifcvf_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
 298                                      u64 desc_area, u64 driver_area,
 299                                      u64 device_area)
 300 {
 301         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 302
 303         vf->vring[qid].desc = desc_area;
 304         vf->vring[qid].avail = driver_area;
 305         vf->vring[qid].used = device_area;
 306
 307         return 0;
 308 }
 309
 310 static void ifcvf_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
 311 {
 312         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 313
 314         ifcvf_notify_queue(vf, qid);
 315 }
 316
 317 static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
 318 {
 319         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 320
 321         return ioread8(&vf->common_cfg->config_generation);
 322 }
 323
 324 static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
 325 {
 326         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 327
 328         return vf->dev_type;
 329 }
 330
 331 static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
 332 {
 333         struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
 334         struct pci_dev *pdev = adapter->pdev;
 335
 336         return pdev->subsystem_vendor;
 337 }
 338
 339 static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
 340 {
 341         return IFCVF_QUEUE_ALIGNMENT;
 342 }
 343
 344 static size_t ifcvf_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
 345 {
 346         return sizeof(struct virtio_net_config);
 347 }
 348
 349 static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
 350                                   unsigned int offset,
 351                                   void *buf, unsigned int len)
 352 {
 353         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 354
 355         WARN_ON(offset + len > sizeof(struct virtio_net_config));
 356         ifcvf_read_net_config(vf, offset, buf, len);
 357 }
 358
 359 static void ifcvf_vdpa_set_config(struct vdpa_device *vdpa_dev,
 360                                   unsigned int offset, const void *buf,
 361                                   unsigned int len)
 362 {
 363         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 364
 365         WARN_ON(offset + len > sizeof(struct virtio_net_config));
 366         ifcvf_write_net_config(vf, offset, buf, len);
 367 }
 368
 369 static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
 370                                      struct vdpa_callback *cb)
 371 {
 372         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 373
 374         vf->config_cb.callback = cb->callback;
 375         vf->config_cb.private = cb->private;
 376 }
 377
 378 static int ifcvf_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev,
 379                                  u16 qid)
 380 {
 381         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 382
 383         return vf->vring[qid].irq;
 384 }
 385
 386 /*
 387  * IFCVF currently does't have on-chip IOMMU, so not
 388  * implemented set_map()/dma_map()/dma_unmap()
 389  */
 390 static const struct vdpa_config_ops ifc_vdpa_ops = {
 391         .get_features   = ifcvf_vdpa_get_features,
 392         .set_features   = ifcvf_vdpa_set_features,
 393         .get_status     = ifcvf_vdpa_get_status,
 394         .set_status     = ifcvf_vdpa_set_status,
 395         .get_vq_num_max = ifcvf_vdpa_get_vq_num_max,
 396         .get_vq_state   = ifcvf_vdpa_get_vq_state,
 397         .set_vq_state   = ifcvf_vdpa_set_vq_state,
 398         .set_vq_cb      = ifcvf_vdpa_set_vq_cb,
 399         .set_vq_ready   = ifcvf_vdpa_set_vq_ready,
 400         .get_vq_ready   = ifcvf_vdpa_get_vq_ready,
 401         .set_vq_num     = ifcvf_vdpa_set_vq_num,
 402         .set_vq_address = ifcvf_vdpa_set_vq_address,
 403         .get_vq_irq     = ifcvf_vdpa_get_vq_irq,
 404         .kick_vq        = ifcvf_vdpa_kick_vq,
 405         .get_generation = ifcvf_vdpa_get_generation,
 406         .get_device_id  = ifcvf_vdpa_get_device_id,
 407         .get_vendor_id  = ifcvf_vdpa_get_vendor_id,
 408         .get_vq_align   = ifcvf_vdpa_get_vq_align,
 409         .get_config_size        = ifcvf_vdpa_get_config_size,
 410         .get_config     = ifcvf_vdpa_get_config,
 411         .set_config     = ifcvf_vdpa_set_config,
 412         .set_config_cb  = ifcvf_vdpa_set_config_cb,
 413 };
 414
 415 static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 416 {
 417         struct device *dev = &pdev->dev;
 418         struct ifcvf_adapter *adapter;
 419         struct ifcvf_hw *vf;
 420         int ret, i;
 421
 422         ret = pcim_enable_device(pdev);
 423         if (ret) {
 424                 IFCVF_ERR(pdev, "Failed to enable device\n");
 425                 return ret;
 426         }
 427
 428         ret = pcim_iomap_regions(pdev, BIT(0) | BIT(2) | BIT(4),
 429                                  IFCVF_DRIVER_NAME);
 430         if (ret) {
 431                 IFCVF_ERR(pdev, "Failed to request MMIO region\n");
 432                 return ret;
 433         }
 434
 435         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
 436         if (ret) {
 437                 IFCVF_ERR(pdev, "No usable DMA configuration\n");
 438                 return ret;
 439         }
 440
 441         ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
 442         if (ret) {
 443                 IFCVF_ERR(pdev,
 444                           "Failed for adding devres for freeing irq vectors\n");
 445                 return ret;
 446         }
 447
 448         adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
 449                                     dev, &ifc_vdpa_ops, NULL);
 450         if (adapter == NULL) {
 451                 IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
 452                 return -ENOMEM;
 453         }
 454
 455         pci_set_master(pdev);
 456         pci_set_drvdata(pdev, adapter);
 457
 458         vf = &adapter->vf;
 459
 460         /* This drirver drives both modern virtio devices and transitional
 461          * devices in modern mode.
 462          * vDPA requires feature bit VIRTIO_F_ACCESS_PLATFORM,
 463          * so legacy devices and transitional devices in legacy
 464          * mode will not work for vDPA, this driver will not
 465          * drive devices with legacy interface.
 466          */
 467         if (pdev->device < 0x1040)
 468                 vf->dev_type =  pdev->subsystem_device;
 469         else
 470                 vf->dev_type =  pdev->device - 0x1040;
 471
 472         vf->base = pcim_iomap_table(pdev);
 473
 474         adapter->pdev = pdev;
 475         adapter->vdpa.dma_dev = &pdev->dev;
 476
 477         ret = ifcvf_init_hw(vf, pdev);
 478         if (ret) {
 479                 IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");
 480                 goto err;
 481         }
 482
 483         for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
 484                 vf->vring[i].irq = -EINVAL;
 485
 486         vf->hw_features = ifcvf_get_hw_features(vf);
 487
 488         ret = vdpa_register_device(&adapter->vdpa, IFCVF_MAX_QUEUE_PAIRS * 2);
 489         if (ret) {
 490                 IFCVF_ERR(pdev, "Failed to register ifcvf to vdpa bus");
 491                 goto err;
 492         }
 493
 494         return 0;
 495
 496 err:
 497         put_device(&adapter->vdpa.dev);
 498         return ret;
 499 }
 500
 501 static void ifcvf_remove(struct pci_dev *pdev)
 502 {
 503         struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);
 504
 505         vdpa_unregister_device(&adapter->vdpa);
 506 }
 507
 508 static struct pci_device_id ifcvf_pci_ids[] = {
 509         { PCI_DEVICE_SUB(N3000_VENDOR_ID,
 510                          N3000_DEVICE_ID,
 511                          N3000_SUBSYS_VENDOR_ID,
 512                          N3000_SUBSYS_DEVICE_ID) },
 513         { PCI_DEVICE_SUB(C5000X_PL_VENDOR_ID,
 514                          C5000X_PL_DEVICE_ID,
 515                          C5000X_PL_SUBSYS_VENDOR_ID,
 516                          C5000X_PL_SUBSYS_DEVICE_ID) },
 517
 518         { 0 },
 519 };
 520 MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);
 521
 522 static struct pci_driver ifcvf_driver = {
 523         .name     = IFCVF_DRIVER_NAME,
 524         .id_table = ifcvf_pci_ids,
 525         .probe    = ifcvf_probe,
 526         .remove   = ifcvf_remove,
 527 };
 528
 529 module_pci_driver(ifcvf_driver);
 530
 531 MODULE_LICENSE("GPL v2");