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