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 VERSION_STRING  "0.1"
  18 #define DRIVER_AUTHOR   "Intel Corporation"
  19 #define IFCVF_DRIVER_NAME       "ifcvf"
  20
  21 static irqreturn_t ifcvf_config_changed(int irq, void *arg)
  22 {
  23         struct ifcvf_hw *vf = arg;
  24
  25         if (vf->config_cb.callback)
  26                 return vf->config_cb.callback(vf->config_cb.private);
  27
  28         return IRQ_HANDLED;
  29 }
  30
  31 static irqreturn_t ifcvf_intr_handler(int irq, void *arg)
  32 {
  33         struct vring_info *vring = arg;
  34
  35         if (vring->cb.callback)
  36                 return vring->cb.callback(vring->cb.private);
  37
  38         return IRQ_HANDLED;
  39 }
  40
  41 static void ifcvf_free_irq_vectors(void *data)
  42 {
  43         pci_free_irq_vectors(data);
  44 }
  45
  46 static void ifcvf_free_irq(struct ifcvf_adapter *adapter, int queues)
  47 {
  48         struct pci_dev *pdev = adapter->pdev;
  49         struct ifcvf_hw *vf = &adapter->vf;
  50         int i;
  51
  52
  53         for (i = 0; i < queues; i++)
  54                 devm_free_irq(&pdev->dev, vf->vring[i].irq, &vf->vring[i]);
  55
  56         ifcvf_free_irq_vectors(pdev);
  57 }
  58
  59 static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
  60 {
  61         struct pci_dev *pdev = adapter->pdev;
  62         struct ifcvf_hw *vf = &adapter->vf;
  63         int vector, i, ret, irq;
  64
  65         ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR,
  66                                     IFCVF_MAX_INTR, PCI_IRQ_MSIX);
  67         if (ret < 0) {
  68                 IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n");
  69                 return ret;
  70         }
  71
  72         snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
  73                  pci_name(pdev));
  74         vector = 0;
  75         irq = pci_irq_vector(pdev, vector);
  76         ret = devm_request_irq(&pdev->dev, irq,
  77                                ifcvf_config_changed, 0,
  78                                vf->config_msix_name, vf);
  79
  80         for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
  81                 snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
  82                          pci_name(pdev), i);
  83                 vector = i + IFCVF_MSI_QUEUE_OFF;
  84                 irq = pci_irq_vector(pdev, vector);
  85                 ret = devm_request_irq(&pdev->dev, irq,
  86                                        ifcvf_intr_handler, 0,
  87                                        vf->vring[i].msix_name,
  88                                        &vf->vring[i]);
  89                 if (ret) {
  90                         IFCVF_ERR(pdev,
  91                                   "Failed to request irq for vq %d\n", i);
  92                         ifcvf_free_irq(adapter, i);
  93
  94                         return ret;
  95                 }
  96
  97                 vf->vring[i].irq = irq;
  98         }
  99
 100         return 0;
 101 }
 102
 103 static int ifcvf_start_datapath(void *private)
 104 {
 105         struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
 106         u8 status;
 107         int ret;
 108
 109         vf->nr_vring = IFCVF_MAX_QUEUE_PAIRS * 2;
 110         ret = ifcvf_start_hw(vf);
 111         if (ret < 0) {
 112                 status = ifcvf_get_status(vf);
 113                 status |= VIRTIO_CONFIG_S_FAILED;
 114                 ifcvf_set_status(vf, status);
 115         }
 116
 117         return ret;
 118 }
 119
 120 static int ifcvf_stop_datapath(void *private)
 121 {
 122         struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
 123         int i;
 124
 125         for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
 126                 vf->vring[i].cb.callback = NULL;
 127
 128         ifcvf_stop_hw(vf);
 129
 130         return 0;
 131 }
 132
 133 static void ifcvf_reset_vring(struct ifcvf_adapter *adapter)
 134 {
 135         struct ifcvf_hw *vf = ifcvf_private_to_vf(adapter);
 136         int i;
 137
 138         for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
 139                 vf->vring[i].last_avail_idx = 0;
 140                 vf->vring[i].desc = 0;
 141                 vf->vring[i].avail = 0;
 142                 vf->vring[i].used = 0;
 143                 vf->vring[i].ready = 0;
 144                 vf->vring[i].cb.callback = NULL;
 145                 vf->vring[i].cb.private = NULL;
 146         }
 147
 148         ifcvf_reset(vf);
 149 }
 150
 151 static struct ifcvf_adapter *vdpa_to_adapter(struct vdpa_device *vdpa_dev)
 152 {
 153         return container_of(vdpa_dev, struct ifcvf_adapter, vdpa);
 154 }
 155
 156 static struct ifcvf_hw *vdpa_to_vf(struct vdpa_device *vdpa_dev)
 157 {
 158         struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
 159
 160         return &adapter->vf;
 161 }
 162
 163 static u64 ifcvf_vdpa_get_features(struct vdpa_device *vdpa_dev)
 164 {
 165         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 166         u64 features;
 167
 168         features = ifcvf_get_features(vf) & IFCVF_SUPPORTED_FEATURES;
 169
 170         return features;
 171 }
 172
 173 static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev, u64 features)
 174 {
 175         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 176
 177         vf->req_features = features;
 178
 179         return 0;
 180 }
 181
 182 static u8 ifcvf_vdpa_get_status(struct vdpa_device *vdpa_dev)
 183 {
 184         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 185
 186         return ifcvf_get_status(vf);
 187 }
 188
 189 static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
 190 {
 191         struct ifcvf_adapter *adapter;
 192         struct ifcvf_hw *vf;
 193         u8 status_old;
 194         int ret;
 195
 196         vf  = vdpa_to_vf(vdpa_dev);
 197         adapter = dev_get_drvdata(vdpa_dev->dev.parent);
 198         status_old = ifcvf_get_status(vf);
 199
 200         if (status_old == status)
 201                 return;
 202
 203         if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) &&
 204             !(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 205                 ifcvf_stop_datapath(adapter);
 206                 ifcvf_free_irq(adapter, IFCVF_MAX_QUEUE_PAIRS * 2);
 207         }
 208
 209         if (status == 0) {
 210                 ifcvf_reset_vring(adapter);
 211                 return;
 212         }
 213
 214         if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
 215             !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) {
 216                 ret = ifcvf_request_irq(adapter);
 217                 if (ret) {
 218                         status = ifcvf_get_status(vf);
 219                         status |= VIRTIO_CONFIG_S_FAILED;
 220                         ifcvf_set_status(vf, status);
 221                         return;
 222                 }
 223
 224                 if (ifcvf_start_datapath(adapter) < 0)
 225                         IFCVF_ERR(adapter->pdev,
 226                                   "Failed to set ifcvf vdpa  status %u\n",
 227                                   status);
 228         }
 229
 230         ifcvf_set_status(vf, status);
 231 }
 232
 233 static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
 234 {
 235         return IFCVF_QUEUE_MAX;
 236 }
 237
 238 static u64 ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid)
 239 {
 240         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 241
 242         return ifcvf_get_vq_state(vf, qid);
 243 }
 244
 245 static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
 246                                    u64 num)
 247 {
 248         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 249
 250         return ifcvf_set_vq_state(vf, qid, num);
 251 }
 252
 253 static void ifcvf_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
 254                                  struct vdpa_callback *cb)
 255 {
 256         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 257
 258         vf->vring[qid].cb = *cb;
 259 }
 260
 261 static void ifcvf_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev,
 262                                     u16 qid, bool ready)
 263 {
 264         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 265
 266         vf->vring[qid].ready = ready;
 267 }
 268
 269 static bool ifcvf_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
 270 {
 271         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 272
 273         return vf->vring[qid].ready;
 274 }
 275
 276 static void ifcvf_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid,
 277                                   u32 num)
 278 {
 279         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 280
 281         vf->vring[qid].size = num;
 282 }
 283
 284 static int ifcvf_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
 285                                      u64 desc_area, u64 driver_area,
 286                                      u64 device_area)
 287 {
 288         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 289
 290         vf->vring[qid].desc = desc_area;
 291         vf->vring[qid].avail = driver_area;
 292         vf->vring[qid].used = device_area;
 293
 294         return 0;
 295 }
 296
 297 static void ifcvf_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
 298 {
 299         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 300
 301         ifcvf_notify_queue(vf, qid);
 302 }
 303
 304 static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
 305 {
 306         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 307
 308         return ioread8(&vf->common_cfg->config_generation);
 309 }
 310
 311 static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
 312 {
 313         return VIRTIO_ID_NET;
 314 }
 315
 316 static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
 317 {
 318         return IFCVF_SUBSYS_VENDOR_ID;
 319 }
 320
 321 static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
 322 {
 323         return IFCVF_QUEUE_ALIGNMENT;
 324 }
 325
 326 static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
 327                                   unsigned int offset,
 328                                   void *buf, unsigned int len)
 329 {
 330         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 331
 332         WARN_ON(offset + len > sizeof(struct virtio_net_config));
 333         ifcvf_read_net_config(vf, offset, buf, len);
 334 }
 335
 336 static void ifcvf_vdpa_set_config(struct vdpa_device *vdpa_dev,
 337                                   unsigned int offset, const void *buf,
 338                                   unsigned int len)
 339 {
 340         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 341
 342         WARN_ON(offset + len > sizeof(struct virtio_net_config));
 343         ifcvf_write_net_config(vf, offset, buf, len);
 344 }
 345
 346 static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
 347                                      struct vdpa_callback *cb)
 348 {
 349         struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 350
 351         vf->config_cb.callback = cb->callback;
 352         vf->config_cb.private = cb->private;
 353 }
 354
 355 /*
 356  * IFCVF currently does't have on-chip IOMMU, so not
 357  * implemented set_map()/dma_map()/dma_unmap()
 358  */
 359 static const struct vdpa_config_ops ifc_vdpa_ops = {
 360         .get_features   = ifcvf_vdpa_get_features,
 361         .set_features   = ifcvf_vdpa_set_features,
 362         .get_status     = ifcvf_vdpa_get_status,
 363         .set_status     = ifcvf_vdpa_set_status,
 364         .get_vq_num_max = ifcvf_vdpa_get_vq_num_max,
 365         .get_vq_state   = ifcvf_vdpa_get_vq_state,
 366         .set_vq_state   = ifcvf_vdpa_set_vq_state,
 367         .set_vq_cb      = ifcvf_vdpa_set_vq_cb,
 368         .set_vq_ready   = ifcvf_vdpa_set_vq_ready,
 369         .get_vq_ready   = ifcvf_vdpa_get_vq_ready,
 370         .set_vq_num     = ifcvf_vdpa_set_vq_num,
 371         .set_vq_address = ifcvf_vdpa_set_vq_address,
 372         .kick_vq        = ifcvf_vdpa_kick_vq,
 373         .get_generation = ifcvf_vdpa_get_generation,
 374         .get_device_id  = ifcvf_vdpa_get_device_id,
 375         .get_vendor_id  = ifcvf_vdpa_get_vendor_id,
 376         .get_vq_align   = ifcvf_vdpa_get_vq_align,
 377         .get_config     = ifcvf_vdpa_get_config,
 378         .set_config     = ifcvf_vdpa_set_config,
 379         .set_config_cb  = ifcvf_vdpa_set_config_cb,
 380 };
 381
 382 static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 383 {
 384         struct device *dev = &pdev->dev;
 385         struct ifcvf_adapter *adapter;
 386         struct ifcvf_hw *vf;
 387         int ret;
 388
 389         ret = pcim_enable_device(pdev);
 390         if (ret) {
 391                 IFCVF_ERR(pdev, "Failed to enable device\n");
 392                 return ret;
 393         }
 394
 395         ret = pcim_iomap_regions(pdev, BIT(0) | BIT(2) | BIT(4),
 396                                  IFCVF_DRIVER_NAME);
 397         if (ret) {
 398                 IFCVF_ERR(pdev, "Failed to request MMIO region\n");
 399                 return ret;
 400         }
 401
 402         ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 403         if (ret) {
 404                 IFCVF_ERR(pdev, "No usable DMA confiugration\n");
 405                 return ret;
 406         }
 407
 408         ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
 409         if (ret) {
 410                 IFCVF_ERR(pdev,
 411                           "No usable coherent DMA confiugration\n");
 412                 return ret;
 413         }
 414
 415         ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
 416         if (ret) {
 417                 IFCVF_ERR(pdev,
 418                           "Failed for adding devres for freeing irq vectors\n");
 419                 return ret;
 420         }
 421
 422         adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
 423                                     dev, &ifc_vdpa_ops);
 424         if (adapter == NULL) {
 425                 IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
 426                 return -ENOMEM;
 427         }
 428
 429         pci_set_master(pdev);
 430         pci_set_drvdata(pdev, adapter);
 431
 432         vf = &adapter->vf;
 433         vf->base = pcim_iomap_table(pdev);
 434
 435         adapter->pdev = pdev;
 436         adapter->vdpa.dma_dev = &pdev->dev;
 437
 438         ret = ifcvf_init_hw(vf, pdev);
 439         if (ret) {
 440                 IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");
 441                 goto err;
 442         }
 443
 444         ret = vdpa_register_device(&adapter->vdpa);
 445         if (ret) {
 446                 IFCVF_ERR(pdev, "Failed to register ifcvf to vdpa bus");
 447                 goto err;
 448         }
 449
 450         return 0;
 451
 452 err:
 453         put_device(&adapter->vdpa.dev);
 454         return ret;
 455 }
 456
 457 static void ifcvf_remove(struct pci_dev *pdev)
 458 {
 459         struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);
 460
 461         vdpa_unregister_device(&adapter->vdpa);
 462 }
 463
 464 static struct pci_device_id ifcvf_pci_ids[] = {
 465         { PCI_DEVICE_SUB(IFCVF_VENDOR_ID,
 466                 IFCVF_DEVICE_ID,
 467                 IFCVF_SUBSYS_VENDOR_ID,
 468                 IFCVF_SUBSYS_DEVICE_ID) },
 469         { 0 },
 470 };
 471 MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);
 472
 473 static struct pci_driver ifcvf_driver = {
 474         .name     = IFCVF_DRIVER_NAME,
 475         .id_table = ifcvf_pci_ids,
 476         .probe    = ifcvf_probe,
 477         .remove   = ifcvf_remove,
 478 };
 479
 480 module_pci_driver(ifcvf_driver);
 481
 482 MODULE_LICENSE("GPL v2");
 483 MODULE_VERSION(VERSION_STRING);