1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * vDPA bus. 4 * 5 * Copyright (c) 2020, Red Hat. All rights reserved. 6 * Author: Jason Wang <jasowang@redhat.com> 7 * 8 */ 9 10#include <linux/module.h> 11#include <linux/idr.h> 12#include <linux/slab.h> 13#include <linux/vdpa.h> 14#include <uapi/linux/vdpa.h> 15#include <net/genetlink.h> 16#include <linux/mod_devicetable.h> 17#include <linux/virtio_ids.h> 18 19static LIST_HEAD(mdev_head); 20/* A global mutex that protects vdpa management device and device level operations. */ 21static DECLARE_RWSEM(vdpa_dev_lock); 22static DEFINE_IDA(vdpa_index_ida); 23 24void vdpa_set_status(struct vdpa_device *vdev, u8 status) 25{ 26 down_write(&vdev->cf_lock); 27 vdev->config->set_status(vdev, status); 28 up_write(&vdev->cf_lock); 29} 30EXPORT_SYMBOL(vdpa_set_status); 31 32static struct genl_family vdpa_nl_family; 33 34static int vdpa_dev_probe(struct device *d) 35{ 36 struct vdpa_device *vdev = dev_to_vdpa(d); 37 struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver); 38 const struct vdpa_config_ops *ops = vdev->config; 39 u32 max_num, min_num = 1; 40 int ret = 0; 41 42 d->dma_mask = &d->coherent_dma_mask; 43 ret = dma_set_mask_and_coherent(d, DMA_BIT_MASK(64)); 44 if (ret) 45 return ret; 46 47 max_num = ops->get_vq_num_max(vdev); 48 if (ops->get_vq_num_min) 49 min_num = ops->get_vq_num_min(vdev); 50 if (max_num < min_num) 51 return -EINVAL; 52 53 if (drv && drv->probe) 54 ret = drv->probe(vdev); 55 56 return ret; 57} 58 59static void vdpa_dev_remove(struct device *d) 60{ 61 struct vdpa_device *vdev = dev_to_vdpa(d); 62 struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver); 63 64 if (drv && drv->remove) 65 drv->remove(vdev); 66} 67 68static int vdpa_dev_match(struct device *dev, struct device_driver *drv) 69{ 70 struct vdpa_device *vdev = dev_to_vdpa(dev); 71 72 /* Check override first, and if set, only use the named driver */ 73 if (vdev->driver_override) 74 return strcmp(vdev->driver_override, drv->name) == 0; 75 76 /* Currently devices must be supported by all vDPA bus drivers */ 77 return 1; 78} 79 80static ssize_t driver_override_store(struct device *dev, 81 struct device_attribute *attr, 82 const char *buf, size_t count) 83{ 84 struct vdpa_device *vdev = dev_to_vdpa(dev); 85 int ret; 86 87 ret = driver_set_override(dev, &vdev->driver_override, buf, count); 88 if (ret) 89 return ret; 90 91 return count; 92} 93 94static ssize_t driver_override_show(struct device *dev, 95 struct device_attribute *attr, char *buf) 96{ 97 struct vdpa_device *vdev = dev_to_vdpa(dev); 98 ssize_t len; 99 100 device_lock(dev); 101 len = snprintf(buf, PAGE_SIZE, "%s\n", vdev->driver_override); 102 device_unlock(dev); 103 104 return len; 105} 106static DEVICE_ATTR_RW(driver_override); 107 108static struct attribute *vdpa_dev_attrs[] = { 109 &dev_attr_driver_override.attr, 110 NULL, 111}; 112 113static const struct attribute_group vdpa_dev_group = { 114 .attrs = vdpa_dev_attrs, 115}; 116__ATTRIBUTE_GROUPS(vdpa_dev); 117 118static const struct bus_type vdpa_bus = { 119 .name = "vdpa", 120 .dev_groups = vdpa_dev_groups, 121 .match = vdpa_dev_match, 122 .probe = vdpa_dev_probe, 123 .remove = vdpa_dev_remove, 124}; 125 126static void vdpa_release_dev(struct device *d) 127{ 128 struct vdpa_device *vdev = dev_to_vdpa(d); 129 const struct vdpa_config_ops *ops = vdev->config; 130 131 if (ops->free) 132 ops->free(vdev); 133 134 ida_free(&vdpa_index_ida, vdev->index); 135 kfree(vdev->driver_override); 136 kfree(vdev); 137} 138 139/** 140 * __vdpa_alloc_device - allocate and initilaize a vDPA device 141 * This allows driver to some prepartion after device is 142 * initialized but before registered. 143 * @parent: the parent device 144 * @config: the bus operations that is supported by this device 145 * @ngroups: number of groups supported by this device 146 * @nas: number of address spaces supported by this device 147 * @size: size of the parent structure that contains private data 148 * @name: name of the vdpa device; optional. 149 * @use_va: indicate whether virtual address must be used by this device 150 * 151 * Driver should use vdpa_alloc_device() wrapper macro instead of 152 * using this directly. 153 * 154 * Return: Returns an error when parent/config/dma_dev is not set or fail to get 155 * ida. 156 */ 157struct vdpa_device *__vdpa_alloc_device(struct device *parent, 158 const struct vdpa_config_ops *config, 159 unsigned int ngroups, unsigned int nas, 160 size_t size, const char *name, 161 bool use_va) 162{ 163 struct vdpa_device *vdev; 164 int err = -EINVAL; 165 166 if (!config) 167 goto err; 168 169 if (!!config->dma_map != !!config->dma_unmap) 170 goto err; 171 172 /* It should only work for the device that use on-chip IOMMU */ 173 if (use_va && !(config->dma_map || config->set_map)) 174 goto err; 175 176 err = -ENOMEM; 177 vdev = kzalloc(size, GFP_KERNEL); 178 if (!vdev) 179 goto err; 180 181 err = ida_alloc(&vdpa_index_ida, GFP_KERNEL); 182 if (err < 0) 183 goto err_ida; 184 185 vdev->dev.bus = &vdpa_bus; 186 vdev->dev.parent = parent; 187 vdev->dev.release = vdpa_release_dev; 188 vdev->index = err; 189 vdev->config = config; 190 vdev->features_valid = false; 191 vdev->use_va = use_va; 192 vdev->ngroups = ngroups; 193 vdev->nas = nas; 194 195 if (name) 196 err = dev_set_name(&vdev->dev, "%s", name); 197 else 198 err = dev_set_name(&vdev->dev, "vdpa%u", vdev->index); 199 if (err) 200 goto err_name; 201 202 init_rwsem(&vdev->cf_lock); 203 device_initialize(&vdev->dev); 204 205 return vdev; 206 207err_name: 208 ida_free(&vdpa_index_ida, vdev->index); 209err_ida: 210 kfree(vdev); 211err: 212 return ERR_PTR(err); 213} 214EXPORT_SYMBOL_GPL(__vdpa_alloc_device); 215 216static int vdpa_name_match(struct device *dev, const void *data) 217{ 218 struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev); 219 220 return (strcmp(dev_name(&vdev->dev), data) == 0); 221} 222 223static int __vdpa_register_device(struct vdpa_device *vdev, u32 nvqs) 224{ 225 struct device *dev; 226 227 vdev->nvqs = nvqs; 228 229 lockdep_assert_held(&vdpa_dev_lock); 230 dev = bus_find_device(&vdpa_bus, NULL, dev_name(&vdev->dev), vdpa_name_match); 231 if (dev) { 232 put_device(dev); 233 return -EEXIST; 234 } 235 return device_add(&vdev->dev); 236} 237 238/** 239 * _vdpa_register_device - register a vDPA device with vdpa lock held 240 * Caller must have a succeed call of vdpa_alloc_device() before. 241 * Caller must invoke this routine in the management device dev_add() 242 * callback after setting up valid mgmtdev for this vdpa device. 243 * @vdev: the vdpa device to be registered to vDPA bus 244 * @nvqs: number of virtqueues supported by this device 245 * 246 * Return: Returns an error when fail to add device to vDPA bus 247 */ 248int _vdpa_register_device(struct vdpa_device *vdev, u32 nvqs) 249{ 250 if (!vdev->mdev) 251 return -EINVAL; 252 253 return __vdpa_register_device(vdev, nvqs); 254} 255EXPORT_SYMBOL_GPL(_vdpa_register_device); 256 257/** 258 * vdpa_register_device - register a vDPA device 259 * Callers must have a succeed call of vdpa_alloc_device() before. 260 * @vdev: the vdpa device to be registered to vDPA bus 261 * @nvqs: number of virtqueues supported by this device 262 * 263 * Return: Returns an error when fail to add to vDPA bus 264 */ 265int vdpa_register_device(struct vdpa_device *vdev, u32 nvqs) 266{ 267 int err; 268 269 down_write(&vdpa_dev_lock); 270 err = __vdpa_register_device(vdev, nvqs); 271 up_write(&vdpa_dev_lock); 272 return err; 273} 274EXPORT_SYMBOL_GPL(vdpa_register_device); 275 276/** 277 * _vdpa_unregister_device - unregister a vDPA device 278 * Caller must invoke this routine as part of management device dev_del() 279 * callback. 280 * @vdev: the vdpa device to be unregisted from vDPA bus 281 */ 282void _vdpa_unregister_device(struct vdpa_device *vdev) 283{ 284 lockdep_assert_held(&vdpa_dev_lock); 285 WARN_ON(!vdev->mdev); 286 device_unregister(&vdev->dev); 287} 288EXPORT_SYMBOL_GPL(_vdpa_unregister_device); 289 290/** 291 * vdpa_unregister_device - unregister a vDPA device 292 * @vdev: the vdpa device to be unregisted from vDPA bus 293 */ 294void vdpa_unregister_device(struct vdpa_device *vdev) 295{ 296 down_write(&vdpa_dev_lock); 297 device_unregister(&vdev->dev); 298 up_write(&vdpa_dev_lock); 299} 300EXPORT_SYMBOL_GPL(vdpa_unregister_device); 301 302/** 303 * __vdpa_register_driver - register a vDPA device driver 304 * @drv: the vdpa device driver to be registered 305 * @owner: module owner of the driver 306 * 307 * Return: Returns an err when fail to do the registration 308 */ 309int __vdpa_register_driver(struct vdpa_driver *drv, struct module *owner) 310{ 311 drv->driver.bus = &vdpa_bus; 312 drv->driver.owner = owner; 313 314 return driver_register(&drv->driver); 315} 316EXPORT_SYMBOL_GPL(__vdpa_register_driver); 317 318/** 319 * vdpa_unregister_driver - unregister a vDPA device driver 320 * @drv: the vdpa device driver to be unregistered 321 */ 322void vdpa_unregister_driver(struct vdpa_driver *drv) 323{ 324 driver_unregister(&drv->driver); 325} 326EXPORT_SYMBOL_GPL(vdpa_unregister_driver); 327 328/** 329 * vdpa_mgmtdev_register - register a vdpa management device 330 * 331 * @mdev: Pointer to vdpa management device 332 * vdpa_mgmtdev_register() register a vdpa management device which supports 333 * vdpa device management. 334 * Return: Returns 0 on success or failure when required callback ops are not 335 * initialized. 336 */ 337int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev) 338{ 339 if (!mdev->device || !mdev->ops || !mdev->ops->dev_add || !mdev->ops->dev_del) 340 return -EINVAL; 341 342 INIT_LIST_HEAD(&mdev->list); 343 down_write(&vdpa_dev_lock); 344 list_add_tail(&mdev->list, &mdev_head); 345 up_write(&vdpa_dev_lock); 346 return 0; 347} 348EXPORT_SYMBOL_GPL(vdpa_mgmtdev_register); 349 350static int vdpa_match_remove(struct device *dev, void *data) 351{ 352 struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev); 353 struct vdpa_mgmt_dev *mdev = vdev->mdev; 354 355 if (mdev == data) 356 mdev->ops->dev_del(mdev, vdev); 357 return 0; 358} 359 360void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev) 361{ 362 down_write(&vdpa_dev_lock); 363 364 list_del(&mdev->list); 365 366 /* Filter out all the entries belong to this management device and delete it. */ 367 bus_for_each_dev(&vdpa_bus, NULL, mdev, vdpa_match_remove); 368 369 up_write(&vdpa_dev_lock); 370} 371EXPORT_SYMBOL_GPL(vdpa_mgmtdev_unregister); 372 373static void vdpa_get_config_unlocked(struct vdpa_device *vdev, 374 unsigned int offset, 375 void *buf, unsigned int len) 376{ 377 const struct vdpa_config_ops *ops = vdev->config; 378 379 /* 380 * Config accesses aren't supposed to trigger before features are set. 381 * If it does happen we assume a legacy guest. 382 */ 383 if (!vdev->features_valid) 384 vdpa_set_features_unlocked(vdev, 0); 385 ops->get_config(vdev, offset, buf, len); 386} 387 388/** 389 * vdpa_get_config - Get one or more device configuration fields. 390 * @vdev: vdpa device to operate on 391 * @offset: starting byte offset of the field 392 * @buf: buffer pointer to read to 393 * @len: length of the configuration fields in bytes 394 */ 395void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset, 396 void *buf, unsigned int len) 397{ 398 down_read(&vdev->cf_lock); 399 vdpa_get_config_unlocked(vdev, offset, buf, len); 400 up_read(&vdev->cf_lock); 401} 402EXPORT_SYMBOL_GPL(vdpa_get_config); 403 404/** 405 * vdpa_set_config - Set one or more device configuration fields. 406 * @vdev: vdpa device to operate on 407 * @offset: starting byte offset of the field 408 * @buf: buffer pointer to read from 409 * @length: length of the configuration fields in bytes 410 */ 411void vdpa_set_config(struct vdpa_device *vdev, unsigned int offset, 412 const void *buf, unsigned int length) 413{ 414 down_write(&vdev->cf_lock); 415 vdev->config->set_config(vdev, offset, buf, length); 416 up_write(&vdev->cf_lock); 417} 418EXPORT_SYMBOL_GPL(vdpa_set_config); 419 420static bool mgmtdev_handle_match(const struct vdpa_mgmt_dev *mdev, 421 const char *busname, const char *devname) 422{ 423 /* Bus name is optional for simulated management device, so ignore the 424 * device with bus if bus attribute is provided. 425 */ 426 if ((busname && !mdev->device->bus) || (!busname && mdev->device->bus)) 427 return false; 428 429 if (!busname && strcmp(dev_name(mdev->device), devname) == 0) 430 return true; 431 432 if (busname && (strcmp(mdev->device->bus->name, busname) == 0) && 433 (strcmp(dev_name(mdev->device), devname) == 0)) 434 return true; 435 436 return false; 437} 438 439static struct vdpa_mgmt_dev *vdpa_mgmtdev_get_from_attr(struct nlattr **attrs) 440{ 441 struct vdpa_mgmt_dev *mdev; 442 const char *busname = NULL; 443 const char *devname; 444 445 if (!attrs[VDPA_ATTR_MGMTDEV_DEV_NAME]) 446 return ERR_PTR(-EINVAL); 447 devname = nla_data(attrs[VDPA_ATTR_MGMTDEV_DEV_NAME]); 448 if (attrs[VDPA_ATTR_MGMTDEV_BUS_NAME]) 449 busname = nla_data(attrs[VDPA_ATTR_MGMTDEV_BUS_NAME]); 450 451 list_for_each_entry(mdev, &mdev_head, list) { 452 if (mgmtdev_handle_match(mdev, busname, devname)) 453 return mdev; 454 } 455 return ERR_PTR(-ENODEV); 456} 457 458static int vdpa_nl_mgmtdev_handle_fill(struct sk_buff *msg, const struct vdpa_mgmt_dev *mdev) 459{ 460 if (mdev->device->bus && 461 nla_put_string(msg, VDPA_ATTR_MGMTDEV_BUS_NAME, mdev->device->bus->name)) 462 return -EMSGSIZE; 463 if (nla_put_string(msg, VDPA_ATTR_MGMTDEV_DEV_NAME, dev_name(mdev->device))) 464 return -EMSGSIZE; 465 return 0; 466} 467 468static u64 vdpa_mgmtdev_get_classes(const struct vdpa_mgmt_dev *mdev, 469 unsigned int *nclasses) 470{ 471 u64 supported_classes = 0; 472 unsigned int n = 0; 473 474 for (int i = 0; mdev->id_table[i].device; i++) { 475 if (mdev->id_table[i].device > 63) 476 continue; 477 supported_classes |= BIT_ULL(mdev->id_table[i].device); 478 n++; 479 } 480 if (nclasses) 481 *nclasses = n; 482 483 return supported_classes; 484} 485 486static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *msg, 487 u32 portid, u32 seq, int flags) 488{ 489 void *hdr; 490 int err; 491 492 hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_MGMTDEV_NEW); 493 if (!hdr) 494 return -EMSGSIZE; 495 err = vdpa_nl_mgmtdev_handle_fill(msg, mdev); 496 if (err) 497 goto msg_err; 498 499 if (nla_put_u64_64bit(msg, VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES, 500 vdpa_mgmtdev_get_classes(mdev, NULL), 501 VDPA_ATTR_UNSPEC)) { 502 err = -EMSGSIZE; 503 goto msg_err; 504 } 505 if (nla_put_u32(msg, VDPA_ATTR_DEV_MGMTDEV_MAX_VQS, 506 mdev->max_supported_vqs)) { 507 err = -EMSGSIZE; 508 goto msg_err; 509 } 510 if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_SUPPORTED_FEATURES, 511 mdev->supported_features, VDPA_ATTR_PAD)) { 512 err = -EMSGSIZE; 513 goto msg_err; 514 } 515 516 genlmsg_end(msg, hdr); 517 return 0; 518 519msg_err: 520 genlmsg_cancel(msg, hdr); 521 return err; 522} 523 524static int vdpa_nl_cmd_mgmtdev_get_doit(struct sk_buff *skb, struct genl_info *info) 525{ 526 struct vdpa_mgmt_dev *mdev; 527 struct sk_buff *msg; 528 int err; 529 530 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 531 if (!msg) 532 return -ENOMEM; 533 534 down_read(&vdpa_dev_lock); 535 mdev = vdpa_mgmtdev_get_from_attr(info->attrs); 536 if (IS_ERR(mdev)) { 537 up_read(&vdpa_dev_lock); 538 NL_SET_ERR_MSG_MOD(info->extack, "Fail to find the specified mgmt device"); 539 err = PTR_ERR(mdev); 540 goto out; 541 } 542 543 err = vdpa_mgmtdev_fill(mdev, msg, info->snd_portid, info->snd_seq, 0); 544 up_read(&vdpa_dev_lock); 545 if (err) 546 goto out; 547 err = genlmsg_reply(msg, info); 548 return err; 549 550out: 551 nlmsg_free(msg); 552 return err; 553} 554 555static int 556vdpa_nl_cmd_mgmtdev_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb) 557{ 558 struct vdpa_mgmt_dev *mdev; 559 int start = cb->args[0]; 560 int idx = 0; 561 int err; 562 563 down_read(&vdpa_dev_lock); 564 list_for_each_entry(mdev, &mdev_head, list) { 565 if (idx < start) { 566 idx++; 567 continue; 568 } 569 err = vdpa_mgmtdev_fill(mdev, msg, NETLINK_CB(cb->skb).portid, 570 cb->nlh->nlmsg_seq, NLM_F_MULTI); 571 if (err) 572 goto out; 573 idx++; 574 } 575out: 576 up_read(&vdpa_dev_lock); 577 cb->args[0] = idx; 578 return msg->len; 579} 580 581#define VDPA_DEV_NET_ATTRS_MASK (BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR) | \ 582 BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU) | \ 583 BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP)) 584 585/* 586 * Bitmask for all per-device features: feature bits VIRTIO_TRANSPORT_F_START 587 * through VIRTIO_TRANSPORT_F_END are unset, i.e. 0xfffffc000fffffff for 588 * all 64bit features. If the features are extended beyond 64 bits, or new 589 * "holes" are reserved for other type of features than per-device, this 590 * macro would have to be updated. 591 */ 592#define VIRTIO_DEVICE_F_MASK (~0ULL << (VIRTIO_TRANSPORT_F_END + 1) | \ 593 ((1ULL << VIRTIO_TRANSPORT_F_START) - 1)) 594 595static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *info) 596{ 597 struct vdpa_dev_set_config config = {}; 598 struct nlattr **nl_attrs = info->attrs; 599 struct vdpa_mgmt_dev *mdev; 600 unsigned int ncls = 0; 601 const u8 *macaddr; 602 const char *name; 603 u64 classes; 604 int err = 0; 605 606 if (!info->attrs[VDPA_ATTR_DEV_NAME]) 607 return -EINVAL; 608 609 name = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]); 610 611 if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR]) { 612 macaddr = nla_data(nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR]); 613 memcpy(config.net.mac, macaddr, sizeof(config.net.mac)); 614 config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR); 615 } 616 if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MTU]) { 617 config.net.mtu = 618 nla_get_u16(nl_attrs[VDPA_ATTR_DEV_NET_CFG_MTU]); 619 config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU); 620 } 621 if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MAX_VQP]) { 622 config.net.max_vq_pairs = 623 nla_get_u16(nl_attrs[VDPA_ATTR_DEV_NET_CFG_MAX_VQP]); 624 if (!config.net.max_vq_pairs) { 625 NL_SET_ERR_MSG_MOD(info->extack, 626 "At least one pair of VQs is required"); 627 return -EINVAL; 628 } 629 config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP); 630 } 631 if (nl_attrs[VDPA_ATTR_DEV_FEATURES]) { 632 u64 missing = 0x0ULL; 633 634 config.device_features = 635 nla_get_u64(nl_attrs[VDPA_ATTR_DEV_FEATURES]); 636 if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR] && 637 !(config.device_features & BIT_ULL(VIRTIO_NET_F_MAC))) 638 missing |= BIT_ULL(VIRTIO_NET_F_MAC); 639 if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MTU] && 640 !(config.device_features & BIT_ULL(VIRTIO_NET_F_MTU))) 641 missing |= BIT_ULL(VIRTIO_NET_F_MTU); 642 if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MAX_VQP] && 643 config.net.max_vq_pairs > 1 && 644 !(config.device_features & BIT_ULL(VIRTIO_NET_F_MQ))) 645 missing |= BIT_ULL(VIRTIO_NET_F_MQ); 646 if (missing) { 647 NL_SET_ERR_MSG_FMT_MOD(info->extack, 648 "Missing features 0x%llx for provided attributes", 649 missing); 650 return -EINVAL; 651 } 652 config.mask |= BIT_ULL(VDPA_ATTR_DEV_FEATURES); 653 } 654 655 /* Skip checking capability if user didn't prefer to configure any 656 * device networking attributes. It is likely that user might have used 657 * a device specific method to configure such attributes or using device 658 * default attributes. 659 */ 660 if ((config.mask & VDPA_DEV_NET_ATTRS_MASK) && 661 !netlink_capable(skb, CAP_NET_ADMIN)) 662 return -EPERM; 663 664 down_write(&vdpa_dev_lock); 665 mdev = vdpa_mgmtdev_get_from_attr(info->attrs); 666 if (IS_ERR(mdev)) { 667 NL_SET_ERR_MSG_MOD(info->extack, "Fail to find the specified management device"); 668 err = PTR_ERR(mdev); 669 goto err; 670 } 671 672 if ((config.mask & mdev->config_attr_mask) != config.mask) { 673 NL_SET_ERR_MSG_FMT_MOD(info->extack, 674 "Some provided attributes are not supported: 0x%llx", 675 config.mask & ~mdev->config_attr_mask); 676 err = -EOPNOTSUPP; 677 goto err; 678 } 679 680 classes = vdpa_mgmtdev_get_classes(mdev, &ncls); 681 if (config.mask & VDPA_DEV_NET_ATTRS_MASK && 682 !(classes & BIT_ULL(VIRTIO_ID_NET))) { 683 NL_SET_ERR_MSG_MOD(info->extack, 684 "Network class attributes provided on unsupported management device"); 685 err = -EINVAL; 686 goto err; 687 } 688 if (!(config.mask & VDPA_DEV_NET_ATTRS_MASK) && 689 config.mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES) && 690 classes & BIT_ULL(VIRTIO_ID_NET) && ncls > 1 && 691 config.device_features & VIRTIO_DEVICE_F_MASK) { 692 NL_SET_ERR_MSG_MOD(info->extack, 693 "Management device supports multi-class while device features specified are ambiguous"); 694 err = -EINVAL; 695 goto err; 696 } 697 698 err = mdev->ops->dev_add(mdev, name, &config); 699err: 700 up_write(&vdpa_dev_lock); 701 return err; 702} 703 704static int vdpa_nl_cmd_dev_del_set_doit(struct sk_buff *skb, struct genl_info *info) 705{ 706 struct vdpa_mgmt_dev *mdev; 707 struct vdpa_device *vdev; 708 struct device *dev; 709 const char *name; 710 int err = 0; 711 712 if (!info->attrs[VDPA_ATTR_DEV_NAME]) 713 return -EINVAL; 714 name = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]); 715 716 down_write(&vdpa_dev_lock); 717 dev = bus_find_device(&vdpa_bus, NULL, name, vdpa_name_match); 718 if (!dev) { 719 NL_SET_ERR_MSG_MOD(info->extack, "device not found"); 720 err = -ENODEV; 721 goto dev_err; 722 } 723 vdev = container_of(dev, struct vdpa_device, dev); 724 if (!vdev->mdev) { 725 NL_SET_ERR_MSG_MOD(info->extack, "Only user created device can be deleted by user"); 726 err = -EINVAL; 727 goto mdev_err; 728 } 729 mdev = vdev->mdev; 730 mdev->ops->dev_del(mdev, vdev); 731mdev_err: 732 put_device(dev); 733dev_err: 734 up_write(&vdpa_dev_lock); 735 return err; 736} 737 738static int 739vdpa_dev_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq, 740 int flags, struct netlink_ext_ack *extack) 741{ 742 u16 max_vq_size; 743 u16 min_vq_size = 1; 744 u32 device_id; 745 u32 vendor_id; 746 void *hdr; 747 int err; 748 749 hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_DEV_NEW); 750 if (!hdr) 751 return -EMSGSIZE; 752 753 err = vdpa_nl_mgmtdev_handle_fill(msg, vdev->mdev); 754 if (err) 755 goto msg_err; 756 757 device_id = vdev->config->get_device_id(vdev); 758 vendor_id = vdev->config->get_vendor_id(vdev); 759 max_vq_size = vdev->config->get_vq_num_max(vdev); 760 if (vdev->config->get_vq_num_min) 761 min_vq_size = vdev->config->get_vq_num_min(vdev); 762 763 err = -EMSGSIZE; 764 if (nla_put_string(msg, VDPA_ATTR_DEV_NAME, dev_name(&vdev->dev))) 765 goto msg_err; 766 if (nla_put_u32(msg, VDPA_ATTR_DEV_ID, device_id)) 767 goto msg_err; 768 if (nla_put_u32(msg, VDPA_ATTR_DEV_VENDOR_ID, vendor_id)) 769 goto msg_err; 770 if (nla_put_u32(msg, VDPA_ATTR_DEV_MAX_VQS, vdev->nvqs)) 771 goto msg_err; 772 if (nla_put_u16(msg, VDPA_ATTR_DEV_MAX_VQ_SIZE, max_vq_size)) 773 goto msg_err; 774 if (nla_put_u16(msg, VDPA_ATTR_DEV_MIN_VQ_SIZE, min_vq_size)) 775 goto msg_err; 776 777 genlmsg_end(msg, hdr); 778 return 0; 779 780msg_err: 781 genlmsg_cancel(msg, hdr); 782 return err; 783} 784 785static int vdpa_nl_cmd_dev_get_doit(struct sk_buff *skb, struct genl_info *info) 786{ 787 struct vdpa_device *vdev; 788 struct sk_buff *msg; 789 const char *devname; 790 struct device *dev; 791 int err; 792 793 if (!info->attrs[VDPA_ATTR_DEV_NAME]) 794 return -EINVAL; 795 devname = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]); 796 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 797 if (!msg) 798 return -ENOMEM; 799 800 down_read(&vdpa_dev_lock); 801 dev = bus_find_device(&vdpa_bus, NULL, devname, vdpa_name_match); 802 if (!dev) { 803 NL_SET_ERR_MSG_MOD(info->extack, "device not found"); 804 err = -ENODEV; 805 goto err; 806 } 807 vdev = container_of(dev, struct vdpa_device, dev); 808 if (!vdev->mdev) { 809 err = -EINVAL; 810 goto mdev_err; 811 } 812 err = vdpa_dev_fill(vdev, msg, info->snd_portid, info->snd_seq, 0, info->extack); 813 if (err) 814 goto mdev_err; 815 816 err = genlmsg_reply(msg, info); 817 put_device(dev); 818 up_read(&vdpa_dev_lock); 819 return err; 820 821mdev_err: 822 put_device(dev); 823err: 824 up_read(&vdpa_dev_lock); 825 nlmsg_free(msg); 826 return err; 827} 828 829struct vdpa_dev_dump_info { 830 struct sk_buff *msg; 831 struct netlink_callback *cb; 832 int start_idx; 833 int idx; 834}; 835 836static int vdpa_dev_dump(struct device *dev, void *data) 837{ 838 struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev); 839 struct vdpa_dev_dump_info *info = data; 840 int err; 841 842 if (!vdev->mdev) 843 return 0; 844 if (info->idx < info->start_idx) { 845 info->idx++; 846 return 0; 847 } 848 err = vdpa_dev_fill(vdev, info->msg, NETLINK_CB(info->cb->skb).portid, 849 info->cb->nlh->nlmsg_seq, NLM_F_MULTI, info->cb->extack); 850 if (err) 851 return err; 852 853 info->idx++; 854 return 0; 855} 856 857static int vdpa_nl_cmd_dev_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb) 858{ 859 struct vdpa_dev_dump_info info; 860 861 info.msg = msg; 862 info.cb = cb; 863 info.start_idx = cb->args[0]; 864 info.idx = 0; 865 866 down_read(&vdpa_dev_lock); 867 bus_for_each_dev(&vdpa_bus, NULL, &info, vdpa_dev_dump); 868 up_read(&vdpa_dev_lock); 869 cb->args[0] = info.idx; 870 return msg->len; 871} 872 873static int vdpa_dev_net_mq_config_fill(struct sk_buff *msg, u64 features, 874 const struct virtio_net_config *config) 875{ 876 u16 val_u16; 877 878 if ((features & BIT_ULL(VIRTIO_NET_F_MQ)) == 0 && 879 (features & BIT_ULL(VIRTIO_NET_F_RSS)) == 0) 880 return 0; 881 882 val_u16 = __virtio16_to_cpu(true, config->max_virtqueue_pairs); 883 884 return nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, val_u16); 885} 886 887static int vdpa_dev_net_mtu_config_fill(struct sk_buff *msg, u64 features, 888 const struct virtio_net_config *config) 889{ 890 u16 val_u16; 891 892 if ((features & BIT_ULL(VIRTIO_NET_F_MTU)) == 0) 893 return 0; 894 895 val_u16 = __virtio16_to_cpu(true, config->mtu); 896 897 return nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16); 898} 899 900static int vdpa_dev_net_mac_config_fill(struct sk_buff *msg, u64 features, 901 const struct virtio_net_config *config) 902{ 903 if ((features & BIT_ULL(VIRTIO_NET_F_MAC)) == 0) 904 return 0; 905 906 return nla_put(msg, VDPA_ATTR_DEV_NET_CFG_MACADDR, 907 sizeof(config->mac), config->mac); 908} 909 910static int vdpa_dev_net_status_config_fill(struct sk_buff *msg, u64 features, 911 const struct virtio_net_config *config) 912{ 913 u16 val_u16; 914 915 if ((features & BIT_ULL(VIRTIO_NET_F_STATUS)) == 0) 916 return 0; 917 918 val_u16 = __virtio16_to_cpu(true, config->status); 919 return nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16); 920} 921 922static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg) 923{ 924 struct virtio_net_config config = {}; 925 u64 features_device; 926 927 vdev->config->get_config(vdev, 0, &config, sizeof(config)); 928 929 features_device = vdev->config->get_device_features(vdev); 930 931 if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_FEATURES, features_device, 932 VDPA_ATTR_PAD)) 933 return -EMSGSIZE; 934 935 if (vdpa_dev_net_mtu_config_fill(msg, features_device, &config)) 936 return -EMSGSIZE; 937 938 if (vdpa_dev_net_mac_config_fill(msg, features_device, &config)) 939 return -EMSGSIZE; 940 941 if (vdpa_dev_net_status_config_fill(msg, features_device, &config)) 942 return -EMSGSIZE; 943 944 return vdpa_dev_net_mq_config_fill(msg, features_device, &config); 945} 946 947static int 948vdpa_dev_blk_capacity_config_fill(struct sk_buff *msg, 949 const struct virtio_blk_config *config) 950{ 951 u64 val_u64; 952 953 val_u64 = __virtio64_to_cpu(true, config->capacity); 954 955 return nla_put_u64_64bit(msg, VDPA_ATTR_DEV_BLK_CFG_CAPACITY, 956 val_u64, VDPA_ATTR_PAD); 957} 958 959static int 960vdpa_dev_blk_seg_size_config_fill(struct sk_buff *msg, u64 features, 961 const struct virtio_blk_config *config) 962{ 963 u32 val_u32; 964 965 if ((features & BIT_ULL(VIRTIO_BLK_F_SIZE_MAX)) == 0) 966 return 0; 967 968 val_u32 = __virtio32_to_cpu(true, config->size_max); 969 970 return nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_SIZE_MAX, val_u32); 971} 972 973/* fill the block size*/ 974static int 975vdpa_dev_blk_block_size_config_fill(struct sk_buff *msg, u64 features, 976 const struct virtio_blk_config *config) 977{ 978 u32 val_u32; 979 980 if ((features & BIT_ULL(VIRTIO_BLK_F_BLK_SIZE)) == 0) 981 return 0; 982 983 val_u32 = __virtio32_to_cpu(true, config->blk_size); 984 985 return nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_BLK_SIZE, val_u32); 986} 987 988static int 989vdpa_dev_blk_seg_max_config_fill(struct sk_buff *msg, u64 features, 990 const struct virtio_blk_config *config) 991{ 992 u32 val_u32; 993 994 if ((features & BIT_ULL(VIRTIO_BLK_F_SEG_MAX)) == 0) 995 return 0; 996 997 val_u32 = __virtio32_to_cpu(true, config->seg_max); 998 999 return nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_SEG_MAX, val_u32); 1000} 1001 1002static int vdpa_dev_blk_mq_config_fill(struct sk_buff *msg, u64 features, 1003 const struct virtio_blk_config *config) 1004{ 1005 u16 val_u16; 1006 1007 if ((features & BIT_ULL(VIRTIO_BLK_F_MQ)) == 0) 1008 return 0; 1009 1010 val_u16 = __virtio16_to_cpu(true, config->num_queues); 1011 1012 return nla_put_u16(msg, VDPA_ATTR_DEV_BLK_CFG_NUM_QUEUES, val_u16); 1013} 1014 1015static int vdpa_dev_blk_topology_config_fill(struct sk_buff *msg, u64 features, 1016 const struct virtio_blk_config *config) 1017{ 1018 u16 min_io_size; 1019 u32 opt_io_size; 1020 1021 if ((features & BIT_ULL(VIRTIO_BLK_F_TOPOLOGY)) == 0) 1022 return 0; 1023 1024 min_io_size = __virtio16_to_cpu(true, config->min_io_size); 1025 opt_io_size = __virtio32_to_cpu(true, config->opt_io_size); 1026 1027 if (nla_put_u8(msg, VDPA_ATTR_DEV_BLK_CFG_PHY_BLK_EXP, 1028 config->physical_block_exp)) 1029 return -EMSGSIZE; 1030 1031 if (nla_put_u8(msg, VDPA_ATTR_DEV_BLK_CFG_ALIGN_OFFSET, 1032 config->alignment_offset)) 1033 return -EMSGSIZE; 1034 1035 if (nla_put_u16(msg, VDPA_ATTR_DEV_BLK_CFG_MIN_IO_SIZE, min_io_size)) 1036 return -EMSGSIZE; 1037 1038 if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_OPT_IO_SIZE, opt_io_size)) 1039 return -EMSGSIZE; 1040 1041 return 0; 1042} 1043 1044static int vdpa_dev_blk_discard_config_fill(struct sk_buff *msg, u64 features, 1045 const struct virtio_blk_config *config) 1046{ 1047 u32 val_u32; 1048 1049 if ((features & BIT_ULL(VIRTIO_BLK_F_DISCARD)) == 0) 1050 return 0; 1051 1052 val_u32 = __virtio32_to_cpu(true, config->max_discard_sectors); 1053 if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_MAX_DISCARD_SEC, val_u32)) 1054 return -EMSGSIZE; 1055 1056 val_u32 = __virtio32_to_cpu(true, config->max_discard_seg); 1057 if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_MAX_DISCARD_SEG, val_u32)) 1058 return -EMSGSIZE; 1059 1060 val_u32 = __virtio32_to_cpu(true, config->discard_sector_alignment); 1061 if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_DISCARD_SEC_ALIGN, val_u32)) 1062 return -EMSGSIZE; 1063 1064 return 0; 1065} 1066 1067static int 1068vdpa_dev_blk_write_zeroes_config_fill(struct sk_buff *msg, u64 features, 1069 const struct virtio_blk_config *config) 1070{ 1071 u32 val_u32; 1072 1073 if ((features & BIT_ULL(VIRTIO_BLK_F_WRITE_ZEROES)) == 0) 1074 return 0; 1075 1076 val_u32 = __virtio32_to_cpu(true, config->max_write_zeroes_sectors); 1077 if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEC, val_u32)) 1078 return -EMSGSIZE; 1079 1080 val_u32 = __virtio32_to_cpu(true, config->max_write_zeroes_seg); 1081 if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEG, val_u32)) 1082 return -EMSGSIZE; 1083 1084 return 0; 1085} 1086 1087static int vdpa_dev_blk_ro_config_fill(struct sk_buff *msg, u64 features) 1088{ 1089 u8 ro; 1090 1091 ro = ((features & BIT_ULL(VIRTIO_BLK_F_RO)) == 0) ? 0 : 1; 1092 if (nla_put_u8(msg, VDPA_ATTR_DEV_BLK_READ_ONLY, ro)) 1093 return -EMSGSIZE; 1094 1095 return 0; 1096} 1097 1098static int vdpa_dev_blk_flush_config_fill(struct sk_buff *msg, u64 features) 1099{ 1100 u8 flush; 1101 1102 flush = ((features & BIT_ULL(VIRTIO_BLK_F_FLUSH)) == 0) ? 0 : 1; 1103 if (nla_put_u8(msg, VDPA_ATTR_DEV_BLK_FLUSH, flush)) 1104 return -EMSGSIZE; 1105 1106 return 0; 1107} 1108 1109static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev, 1110 struct sk_buff *msg) 1111{ 1112 struct virtio_blk_config config = {}; 1113 u64 features_device; 1114 1115 vdev->config->get_config(vdev, 0, &config, sizeof(config)); 1116 1117 features_device = vdev->config->get_device_features(vdev); 1118 1119 if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_FEATURES, features_device, 1120 VDPA_ATTR_PAD)) 1121 return -EMSGSIZE; 1122 1123 if (vdpa_dev_blk_capacity_config_fill(msg, &config)) 1124 return -EMSGSIZE; 1125 1126 if (vdpa_dev_blk_seg_size_config_fill(msg, features_device, &config)) 1127 return -EMSGSIZE; 1128 1129 if (vdpa_dev_blk_block_size_config_fill(msg, features_device, &config)) 1130 return -EMSGSIZE; 1131 1132 if (vdpa_dev_blk_seg_max_config_fill(msg, features_device, &config)) 1133 return -EMSGSIZE; 1134 1135 if (vdpa_dev_blk_mq_config_fill(msg, features_device, &config)) 1136 return -EMSGSIZE; 1137 1138 if (vdpa_dev_blk_topology_config_fill(msg, features_device, &config)) 1139 return -EMSGSIZE; 1140 1141 if (vdpa_dev_blk_discard_config_fill(msg, features_device, &config)) 1142 return -EMSGSIZE; 1143 1144 if (vdpa_dev_blk_write_zeroes_config_fill(msg, features_device, &config)) 1145 return -EMSGSIZE; 1146 1147 if (vdpa_dev_blk_ro_config_fill(msg, features_device)) 1148 return -EMSGSIZE; 1149 1150 if (vdpa_dev_blk_flush_config_fill(msg, features_device)) 1151 return -EMSGSIZE; 1152 1153 return 0; 1154} 1155 1156static int 1157vdpa_dev_config_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq, 1158 int flags, struct netlink_ext_ack *extack) 1159{ 1160 u64 features_driver; 1161 u8 status = 0; 1162 u32 device_id; 1163 void *hdr; 1164 int err; 1165 1166 down_read(&vdev->cf_lock); 1167 hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, 1168 VDPA_CMD_DEV_CONFIG_GET); 1169 if (!hdr) { 1170 err = -EMSGSIZE; 1171 goto out; 1172 } 1173 1174 if (nla_put_string(msg, VDPA_ATTR_DEV_NAME, dev_name(&vdev->dev))) { 1175 err = -EMSGSIZE; 1176 goto msg_err; 1177 } 1178 1179 device_id = vdev->config->get_device_id(vdev); 1180 if (nla_put_u32(msg, VDPA_ATTR_DEV_ID, device_id)) { 1181 err = -EMSGSIZE; 1182 goto msg_err; 1183 } 1184 1185 /* only read driver features after the feature negotiation is done */ 1186 status = vdev->config->get_status(vdev); 1187 if (status & VIRTIO_CONFIG_S_FEATURES_OK) { 1188 features_driver = vdev->config->get_driver_features(vdev); 1189 if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features_driver, 1190 VDPA_ATTR_PAD)) { 1191 err = -EMSGSIZE; 1192 goto msg_err; 1193 } 1194 } 1195 1196 switch (device_id) { 1197 case VIRTIO_ID_NET: 1198 err = vdpa_dev_net_config_fill(vdev, msg); 1199 break; 1200 case VIRTIO_ID_BLOCK: 1201 err = vdpa_dev_blk_config_fill(vdev, msg); 1202 break; 1203 default: 1204 err = -EOPNOTSUPP; 1205 break; 1206 } 1207 if (err) 1208 goto msg_err; 1209 1210 up_read(&vdev->cf_lock); 1211 genlmsg_end(msg, hdr); 1212 return 0; 1213 1214msg_err: 1215 genlmsg_cancel(msg, hdr); 1216out: 1217 up_read(&vdev->cf_lock); 1218 return err; 1219} 1220 1221static int vdpa_fill_stats_rec(struct vdpa_device *vdev, struct sk_buff *msg, 1222 struct genl_info *info, u32 index) 1223{ 1224 struct virtio_net_config config = {}; 1225 u64 features; 1226 u8 status; 1227 int err; 1228 1229 status = vdev->config->get_status(vdev); 1230 if (!(status & VIRTIO_CONFIG_S_FEATURES_OK)) { 1231 NL_SET_ERR_MSG_MOD(info->extack, "feature negotiation not complete"); 1232 return -EAGAIN; 1233 } 1234 vdpa_get_config_unlocked(vdev, 0, &config, sizeof(config)); 1235 1236 features = vdev->config->get_driver_features(vdev); 1237 if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, 1238 features, VDPA_ATTR_PAD)) 1239 return -EMSGSIZE; 1240 1241 err = vdpa_dev_net_mq_config_fill(msg, features, &config); 1242 if (err) 1243 return err; 1244 1245 if (nla_put_u32(msg, VDPA_ATTR_DEV_QUEUE_INDEX, index)) 1246 return -EMSGSIZE; 1247 1248 err = vdev->config->get_vendor_vq_stats(vdev, index, msg, info->extack); 1249 if (err) 1250 return err; 1251 1252 return 0; 1253} 1254 1255static int vendor_stats_fill(struct vdpa_device *vdev, struct sk_buff *msg, 1256 struct genl_info *info, u32 index) 1257{ 1258 int err; 1259 1260 down_read(&vdev->cf_lock); 1261 if (!vdev->config->get_vendor_vq_stats) { 1262 err = -EOPNOTSUPP; 1263 goto out; 1264 } 1265 1266 err = vdpa_fill_stats_rec(vdev, msg, info, index); 1267out: 1268 up_read(&vdev->cf_lock); 1269 return err; 1270} 1271 1272static int vdpa_dev_vendor_stats_fill(struct vdpa_device *vdev, 1273 struct sk_buff *msg, 1274 struct genl_info *info, u32 index) 1275{ 1276 u32 device_id; 1277 void *hdr; 1278 int err; 1279 u32 portid = info->snd_portid; 1280 u32 seq = info->snd_seq; 1281 u32 flags = 0; 1282 1283 hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, 1284 VDPA_CMD_DEV_VSTATS_GET); 1285 if (!hdr) 1286 return -EMSGSIZE; 1287 1288 if (nla_put_string(msg, VDPA_ATTR_DEV_NAME, dev_name(&vdev->dev))) { 1289 err = -EMSGSIZE; 1290 goto undo_msg; 1291 } 1292 1293 device_id = vdev->config->get_device_id(vdev); 1294 if (nla_put_u32(msg, VDPA_ATTR_DEV_ID, device_id)) { 1295 err = -EMSGSIZE; 1296 goto undo_msg; 1297 } 1298 1299 switch (device_id) { 1300 case VIRTIO_ID_NET: 1301 if (index > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) { 1302 NL_SET_ERR_MSG_MOD(info->extack, "queue index exceeds max value"); 1303 err = -ERANGE; 1304 break; 1305 } 1306 1307 err = vendor_stats_fill(vdev, msg, info, index); 1308 break; 1309 default: 1310 err = -EOPNOTSUPP; 1311 break; 1312 } 1313 genlmsg_end(msg, hdr); 1314 1315 return err; 1316 1317undo_msg: 1318 genlmsg_cancel(msg, hdr); 1319 return err; 1320} 1321 1322static int vdpa_nl_cmd_dev_config_get_doit(struct sk_buff *skb, struct genl_info *info) 1323{ 1324 struct vdpa_device *vdev; 1325 struct sk_buff *msg; 1326 const char *devname; 1327 struct device *dev; 1328 int err; 1329 1330 if (!info->attrs[VDPA_ATTR_DEV_NAME]) 1331 return -EINVAL; 1332 devname = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]); 1333 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1334 if (!msg) 1335 return -ENOMEM; 1336 1337 down_read(&vdpa_dev_lock); 1338 dev = bus_find_device(&vdpa_bus, NULL, devname, vdpa_name_match); 1339 if (!dev) { 1340 NL_SET_ERR_MSG_MOD(info->extack, "device not found"); 1341 err = -ENODEV; 1342 goto dev_err; 1343 } 1344 vdev = container_of(dev, struct vdpa_device, dev); 1345 if (!vdev->mdev) { 1346 NL_SET_ERR_MSG_MOD(info->extack, "unmanaged vdpa device"); 1347 err = -EINVAL; 1348 goto mdev_err; 1349 } 1350 err = vdpa_dev_config_fill(vdev, msg, info->snd_portid, info->snd_seq, 1351 0, info->extack); 1352 if (!err) 1353 err = genlmsg_reply(msg, info); 1354 1355mdev_err: 1356 put_device(dev); 1357dev_err: 1358 up_read(&vdpa_dev_lock); 1359 if (err) 1360 nlmsg_free(msg); 1361 return err; 1362} 1363 1364static int vdpa_dev_config_dump(struct device *dev, void *data) 1365{ 1366 struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev); 1367 struct vdpa_dev_dump_info *info = data; 1368 int err; 1369 1370 if (!vdev->mdev) 1371 return 0; 1372 if (info->idx < info->start_idx) { 1373 info->idx++; 1374 return 0; 1375 } 1376 err = vdpa_dev_config_fill(vdev, info->msg, NETLINK_CB(info->cb->skb).portid, 1377 info->cb->nlh->nlmsg_seq, NLM_F_MULTI, 1378 info->cb->extack); 1379 if (err) 1380 return err; 1381 1382 info->idx++; 1383 return 0; 1384} 1385 1386static int 1387vdpa_nl_cmd_dev_config_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb) 1388{ 1389 struct vdpa_dev_dump_info info; 1390 1391 info.msg = msg; 1392 info.cb = cb; 1393 info.start_idx = cb->args[0]; 1394 info.idx = 0; 1395 1396 down_read(&vdpa_dev_lock); 1397 bus_for_each_dev(&vdpa_bus, NULL, &info, vdpa_dev_config_dump); 1398 up_read(&vdpa_dev_lock); 1399 cb->args[0] = info.idx; 1400 return msg->len; 1401} 1402 1403static int vdpa_nl_cmd_dev_stats_get_doit(struct sk_buff *skb, 1404 struct genl_info *info) 1405{ 1406 struct vdpa_device *vdev; 1407 struct sk_buff *msg; 1408 const char *devname; 1409 struct device *dev; 1410 u32 index; 1411 int err; 1412 1413 if (!info->attrs[VDPA_ATTR_DEV_NAME]) 1414 return -EINVAL; 1415 1416 if (!info->attrs[VDPA_ATTR_DEV_QUEUE_INDEX]) 1417 return -EINVAL; 1418 1419 devname = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]); 1420 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1421 if (!msg) 1422 return -ENOMEM; 1423 1424 index = nla_get_u32(info->attrs[VDPA_ATTR_DEV_QUEUE_INDEX]); 1425 down_read(&vdpa_dev_lock); 1426 dev = bus_find_device(&vdpa_bus, NULL, devname, vdpa_name_match); 1427 if (!dev) { 1428 NL_SET_ERR_MSG_MOD(info->extack, "device not found"); 1429 err = -ENODEV; 1430 goto dev_err; 1431 } 1432 vdev = container_of(dev, struct vdpa_device, dev); 1433 if (!vdev->mdev) { 1434 NL_SET_ERR_MSG_MOD(info->extack, "unmanaged vdpa device"); 1435 err = -EINVAL; 1436 goto mdev_err; 1437 } 1438 err = vdpa_dev_vendor_stats_fill(vdev, msg, info, index); 1439 if (err) 1440 goto mdev_err; 1441 1442 err = genlmsg_reply(msg, info); 1443 1444 put_device(dev); 1445 up_read(&vdpa_dev_lock); 1446 1447 return err; 1448 1449mdev_err: 1450 put_device(dev); 1451dev_err: 1452 nlmsg_free(msg); 1453 up_read(&vdpa_dev_lock); 1454 return err; 1455} 1456 1457static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = { 1458 [VDPA_ATTR_MGMTDEV_BUS_NAME] = { .type = NLA_NUL_STRING }, 1459 [VDPA_ATTR_MGMTDEV_DEV_NAME] = { .type = NLA_STRING }, 1460 [VDPA_ATTR_DEV_NAME] = { .type = NLA_STRING }, 1461 [VDPA_ATTR_DEV_NET_CFG_MACADDR] = NLA_POLICY_ETH_ADDR, 1462 [VDPA_ATTR_DEV_NET_CFG_MAX_VQP] = { .type = NLA_U16 }, 1463 /* virtio spec 1.1 section 5.1.4.1 for valid MTU range */ 1464 [VDPA_ATTR_DEV_NET_CFG_MTU] = NLA_POLICY_MIN(NLA_U16, 68), 1465 [VDPA_ATTR_DEV_QUEUE_INDEX] = { .type = NLA_U32 }, 1466 [VDPA_ATTR_DEV_FEATURES] = { .type = NLA_U64 }, 1467}; 1468 1469static const struct genl_ops vdpa_nl_ops[] = { 1470 { 1471 .cmd = VDPA_CMD_MGMTDEV_GET, 1472 .doit = vdpa_nl_cmd_mgmtdev_get_doit, 1473 .dumpit = vdpa_nl_cmd_mgmtdev_get_dumpit, 1474 }, 1475 { 1476 .cmd = VDPA_CMD_DEV_NEW, 1477 .doit = vdpa_nl_cmd_dev_add_set_doit, 1478 .flags = GENL_ADMIN_PERM, 1479 }, 1480 { 1481 .cmd = VDPA_CMD_DEV_DEL, 1482 .doit = vdpa_nl_cmd_dev_del_set_doit, 1483 .flags = GENL_ADMIN_PERM, 1484 }, 1485 { 1486 .cmd = VDPA_CMD_DEV_GET, 1487 .doit = vdpa_nl_cmd_dev_get_doit, 1488 .dumpit = vdpa_nl_cmd_dev_get_dumpit, 1489 }, 1490 { 1491 .cmd = VDPA_CMD_DEV_CONFIG_GET, 1492 .doit = vdpa_nl_cmd_dev_config_get_doit, 1493 .dumpit = vdpa_nl_cmd_dev_config_get_dumpit, 1494 }, 1495 { 1496 .cmd = VDPA_CMD_DEV_VSTATS_GET, 1497 .doit = vdpa_nl_cmd_dev_stats_get_doit, 1498 .flags = GENL_ADMIN_PERM, 1499 }, 1500}; 1501 1502static struct genl_family vdpa_nl_family __ro_after_init = { 1503 .name = VDPA_GENL_NAME, 1504 .version = VDPA_GENL_VERSION, 1505 .maxattr = VDPA_ATTR_MAX, 1506 .policy = vdpa_nl_policy, 1507 .netnsok = false, 1508 .module = THIS_MODULE, 1509 .ops = vdpa_nl_ops, 1510 .n_ops = ARRAY_SIZE(vdpa_nl_ops), 1511 .resv_start_op = VDPA_CMD_DEV_VSTATS_GET + 1, 1512}; 1513 1514static int vdpa_init(void) 1515{ 1516 int err; 1517 1518 err = bus_register(&vdpa_bus); 1519 if (err) 1520 return err; 1521 err = genl_register_family(&vdpa_nl_family); 1522 if (err) 1523 goto err; 1524 return 0; 1525 1526err: 1527 bus_unregister(&vdpa_bus); 1528 return err; 1529} 1530 1531static void __exit vdpa_exit(void) 1532{ 1533 genl_unregister_family(&vdpa_nl_family); 1534 bus_unregister(&vdpa_bus); 1535 ida_destroy(&vdpa_index_ida); 1536} 1537core_initcall(vdpa_init); 1538module_exit(vdpa_exit); 1539 1540MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>"); 1541MODULE_LICENSE("GPL v2"); 1542