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); 484