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_adapter *adapter = vdpa_to_adapter(vdpa_dev);
 172         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 173         struct pci_dev *pdev = adapter->pdev;
 174
 175         u64 features;
 176
 177         switch (vf->dev_type) {
 178         case VIRTIO_ID_NET:
 179                 features = ifcvf_get_features(vf) & IFCVF_NET_SUPPORTED_FEATURES;
 180                 break;
 181         case VIRTIO_ID_BLOCK:
 182                 features = ifcvf_get_features(vf);
 183                 break;
 184         default:
 185                 features = 0;
 186                 IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", vf->dev_type);
 187         }
 188
 189         return features;
 190 }
 191
 192 static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev, u64 features)
 193 {
 194         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 195         int ret;
 196
 197         ret = ifcvf_verify_min_features(vf, features);
 198         if (ret)
 199                 return ret;
 200
 201         vf->req_features = features;
 202
 203         return 0;
 204 }
 205
 206 static u8 ifcvf_vdpa_get_status(struct vdpa_device *vdpa_dev)
 207 {
 208         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 209
 210         return ifcvf_get_status(vf);
 211 }
 212
 213 static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
 214 {
 215         struct ifcvf_adapter *adapter;
 216         struct ifcvf_hw *vf;
 217         u8 status_old;
 218         int ret;
 219
 220         vf  = vdpa_to_vf(vdpa_dev);
 221         adapter = dev_get_drvdata(vdpa_dev->dev.parent);
 222         status_old = ifcvf_get_status(vf);
 223
 224         if (status_old == status)
 225                 return;
 226
 227         if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) &&
 228             !(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 229                 ifcvf_stop_datapath(adapter);
 230                 ifcvf_free_irq(adapter, IFCVF_MAX_QUEUE_PAIRS * 2);
 231         }
 232
 233         if (status == 0) {
 234                 ifcvf_reset_vring(adapter);
 235                 return;
 236         }
 237
 238         if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
 239             !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) {
 240                 ret = ifcvf_request_irq(adapter);
 241                 if (ret) {
 242                         status = ifcvf_get_status(vf);
 243                         status |= VIRTIO_CONFIG_S_FAILED;
 244                         ifcvf_set_status(vf, status);
 245                         return;
 246                 }
 247
 248                 if (ifcvf_start_datapath(adapter) < 0)
 249                         IFCVF_ERR(adapter->pdev,
 250                                   "Failed to set ifcvf vdpa  status %u\n",
 251                                   status);
 252         }
 253
 254         ifcvf_set_status(vf, status);
 255 }
 256
 257 static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
 258 {
 259         return IFCVF_QUEUE_MAX;
 260 }
 261
 262 static int ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
 263                                    struct vdpa_vq_state *state)
 264 {
 265         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 266
 267         state->split.avail_index = ifcvf_get_vq_state(vf, qid);
 268         return 0;
 269 }
 270
 271 static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
 272                                    const struct vdpa_vq_state *state)
 273 {
 274         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 275
 276         return ifcvf_set_vq_state(vf, qid, state->split.avail_index);
 277 }
 278
 279 static void ifcvf_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
 280                                  struct vdpa_callback *cb)
 281 {
 282         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 283
 284         vf->vring[qid].cb = *cb;
 285 }
 286
 287 static void ifcvf_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev,
 288                                     u16 qid, bool ready)
 289 {
 290         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 291
 292         vf->vring[qid].ready = ready;
 293 }
 294
 295 static bool ifcvf_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
 296 {
 297         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 298
 299         return vf->vring[qid].ready;
 300 }
 301
 302 static void ifcvf_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid,
 303                                   u32 num)
 304 {
 305         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 306
 307         vf->vring[qid].size = num;
 308 }
 309
 310 static int ifcvf_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
 311                                      u64 desc_area, u64 driver_area,
 312                                      u64 device_area)
 313 {
 314         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 315
 316         vf->vring[qid].desc = desc_area;
 317         vf->vring[qid].avail = driver_area;
 318         vf->vring[qid].used = device_area;
 319
 320         return 0;
 321 }
 322
 323 static void ifcvf_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
 324 {
 325         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 326
 327         ifcvf_notify_queue(vf, qid);
 328 }
 329
 330 static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
 331 {
 332         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 333
 334         return ioread8(&vf->common_cfg->config_generation);
 335 }
 336
 337 static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
 338 {
 339         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 340
 341         return vf->dev_type;
 342 }
 343
 344 static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
 345 {
 346         struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
 347         struct pci_dev *pdev = adapter->pdev;
 348
 349         return pdev->subsystem_vendor;
 350 }
 351
 352 static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
 353 {
 354         return IFCVF_QUEUE_ALIGNMENT;
 355 }
 356
 357 static size_t ifcvf_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
 358 {
 359         struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
 360         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 361         struct pci_dev *pdev = adapter->pdev;
 362         size_t size;
 363
 364         switch (vf->dev_type) {
 365         case VIRTIO_ID_NET:
 366                 size = sizeof(struct virtio_net_config);
 367                 break;
 368         case VIRTIO_ID_BLOCK:
 369                 size = sizeof(struct virtio_blk_config);
 370                 break;
 371         default:
 372                 size = 0;
 373                 IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", vf->dev_type);
 374         }
 375
 376         return size;
 377 }
 378
 379 static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
 380                                   unsigned int offset,
 381                                   void *buf, unsigned int len)
 382 {
 383         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 384
 385         WARN_ON(offset + len > sizeof(struct virtio_net_config));
 386         ifcvf_read_net_config(vf, offset, buf, len);
 387 }
 388
 389 static void ifcvf_vdpa_set_config(struct vdpa_device *vdpa_dev,
 390                                   unsigned int offset, const void *buf,
 391                                   unsigned int len)
 392 {
 393         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 394
 395         WARN_ON(offset + len > sizeof(struct virtio_net_config));
 396         ifcvf_write_net_config(vf, offset, buf, len);
 397 }
 398
 399 static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
 400                                      struct vdpa_callback *cb)
 401 {
 402         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 403
 404         vf->config_cb.callback = cb->callback;
 405         vf->config_cb.private = cb->private;
 406 }
 407
 408 static int ifcvf_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev,
 409                                  u16 qid)
 410 {
 411         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 412
 413         return vf->vring[qid].irq;
 414 }
 415
 416 static struct vdpa_notification_area ifcvf_get_vq_notification(struct vdpa_device *vdpa_dev,
 417                                                                u16 idx)
 418 {
 419         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 420         struct vdpa_notification_area area;
 421
 422         area.addr = vf->vring[idx].notify_pa;
 423         if (!vf->notify_off_multiplier)
 424                 area.size = PAGE_SIZE;
 425         else
 426                 area.size = vf->notify_off_multiplier;
 427
 428         return area;
 429 }
 430
 431 /*
 432  * IFCVF currently does't have on-chip IOMMU, so not
 433  * implemented set_map()/dma_map()/dma_unmap()
 434  */
 435 static const struct vdpa_config_ops ifc_vdpa_ops = {
 436         .get_features   = ifcvf_vdpa_get_features,
 437         .set_features   = ifcvf_vdpa_set_features,
 438         .get_status     = ifcvf_vdpa_get_status,
 439         .set_status     = ifcvf_vdpa_set_status,
 440         .get_vq_num_max = ifcvf_vdpa_get_vq_num_max,
 441         .get_vq_state   = ifcvf_vdpa_get_vq_state,
 442         .set_vq_state   = ifcvf_vdpa_set_vq_state,
 443         .set_vq_cb      = ifcvf_vdpa_set_vq_cb,
 444         .set_vq_ready   = ifcvf_vdpa_set_vq_ready,
 445         .get_vq_ready   = ifcvf_vdpa_get_vq_ready,
 446         .set_vq_num     = ifcvf_vdpa_set_vq_num,
 447         .set_vq_address = ifcvf_vdpa_set_vq_address,
 448         .get_vq_irq     = ifcvf_vdpa_get_vq_irq,
 449         .kick_vq        = ifcvf_vdpa_kick_vq,
 450         .get_generation = ifcvf_vdpa_get_generation,
 451         .get_device_id  = ifcvf_vdpa_get_device_id,
 452         .get_vendor_id  = ifcvf_vdpa_get_vendor_id,
 453         .get_vq_align   = ifcvf_vdpa_get_vq_align,
 454         .get_config_size        = ifcvf_vdpa_get_config_size,
 455         .get_config     = ifcvf_vdpa_get_config,
 456         .set_config     = ifcvf_vdpa_set_config,
 457         .set_config_cb  = ifcvf_vdpa_set_config_cb,
 458         .get_vq_notification = ifcvf_get_vq_notification,
 459 };
 460
 461 static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 462 {
 463         struct device *dev = &pdev->dev;
 464         struct ifcvf_adapter *adapter;
 465         struct ifcvf_hw *vf;
 466         int ret, i;
 467
 468         ret = pcim_enable_device(pdev);
 469         if (ret) {
 470                 IFCVF_ERR(pdev, "Failed to enable device\n");
 471                 return ret;
 472         }
 473
 474         ret = pcim_iomap_regions(pdev, BIT(0) | BIT(2) | BIT(4),
 475                                  IFCVF_DRIVER_NAME);
 476         if (ret) {
 477                 IFCVF_ERR(pdev, "Failed to request MMIO region\n");
 478                 return ret;
 479         }
 480
 481         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
 482         if (ret) {
 483                 IFCVF_ERR(pdev, "No usable DMA configuration\n");
 484                 return ret;
 485         }
 486
 487         ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
 488         if (ret) {
 489                 IFCVF_ERR(pdev,
 490                           "Failed for adding devres for freeing irq vectors\n");
 491                 return ret;
 492         }
 493
 494         adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
 495                                     dev, &ifc_vdpa_ops, NULL);
 496         if (IS_ERR(adapter)) {
 497                 IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
 498                 return PTR_ERR(adapter);
 499         }
 500
 501         pci_set_master(pdev);
 502         pci_set_drvdata(pdev, adapter);
 503
 504         vf = &adapter->vf;
 505
 506         /* This drirver drives both modern virtio devices and transitional
 507          * devices in modern mode.
 508          * vDPA requires feature bit VIRTIO_F_ACCESS_PLATFORM,
 509          * so legacy devices and transitional devices in legacy
 510          * mode will not work for vDPA, this driver will not
 511          * drive devices with legacy interface.
 512          */
 513         if (pdev->device < 0x1040)
 514                 vf->dev_type =  pdev->subsystem_device;
 515         else
 516                 vf->dev_type =  pdev->device - 0x1040;
 517
 518         vf->base = pcim_iomap_table(pdev);
 519
 520         adapter->pdev = pdev;
 521         adapter->vdpa.dma_dev = &pdev->dev;
 522
 523         ret = ifcvf_init_hw(vf, pdev);
 524         if (ret) {
 525                 IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");
 526                 goto err;
 527         }
 528
 529         for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
 530                 vf->vring[i].irq = -EINVAL;
 531
 532         vf->hw_features = ifcvf_get_hw_features(vf);
 533
 534         ret = vdpa_register_device(&adapter->vdpa, IFCVF_MAX_QUEUE_PAIRS * 2);
 535         if (ret) {
 536                 IFCVF_ERR(pdev, "Failed to register ifcvf to vdpa bus");
 537                 goto err;
 538         }
 539
 540         return 0;
 541
 542 err:
 543         put_device(&adapter->vdpa.dev);
 544         return ret;
 545 }
 546
 547 static void ifcvf_remove(struct pci_dev *pdev)
 548 {
 549         struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);
 550
 551         vdpa_unregister_device(&adapter->vdpa);
 552 }
 553
 554 static struct pci_device_id ifcvf_pci_ids[] = {
 555         /* N3000 network device */
 556         { PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
 557                          N3000_DEVICE_ID,
 558                          PCI_VENDOR_ID_INTEL,
 559                          N3000_SUBSYS_DEVICE_ID) },
 560         /* C5000X-PL network device */
 561         { PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
 562                          VIRTIO_TRANS_ID_NET,
 563                          PCI_VENDOR_ID_INTEL,
 564                          VIRTIO_ID_NET) },
 565         /* C5000X-PL block device */
 566         { PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
 567                          VIRTIO_TRANS_ID_BLOCK,
 568                          PCI_VENDOR_ID_INTEL,
 569                          VIRTIO_ID_BLOCK) },
 570
 571         { 0 },
 572 };
 573 MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);
 574
 575 static struct pci_driver ifcvf_driver = {
 576         .name     = IFCVF_DRIVER_NAME,
 577         .id_table = ifcvf_pci_ids,
 578         .probe    = ifcvf_probe,
 579         .remove   = ifcvf_remove,
 580 };
 581
 582 module_pci_driver(ifcvf_driver);
 583
 584 MODULE_LICENSE("GPL v2");