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