diff options
Diffstat (limited to 'drivers/net/ifc/ifcvf_vdpa.c')
| -rw-r--r-- | drivers/net/ifc/ifcvf_vdpa.c | 793 |
1 files changed, 793 insertions, 0 deletions
diff --git a/drivers/net/ifc/ifcvf_vdpa.c b/drivers/net/ifc/ifcvf_vdpa.c new file mode 100644 index 00000000..88d81403 --- /dev/null +++ b/drivers/net/ifc/ifcvf_vdpa.c @@ -0,0 +1,793 @@ +/* SPDX-License-Identifier: BSD-3-Clause + * Copyright(c) 2018 Intel Corporation + */ + +#include <unistd.h> +#include <pthread.h> +#include <fcntl.h> +#include <sys/ioctl.h> +#include <sys/epoll.h> + +#include <rte_malloc.h> +#include <rte_memory.h> +#include <rte_bus_pci.h> +#include <rte_vhost.h> +#include <rte_vdpa.h> +#include <rte_vfio.h> +#include <rte_spinlock.h> +#include <rte_log.h> + +#include "base/ifcvf.h" + +#define DRV_LOG(level, fmt, args...) \ + rte_log(RTE_LOG_ ## level, ifcvf_vdpa_logtype, \ + "%s(): " fmt "\n", __func__, ##args) + +#ifndef PAGE_SIZE +#define PAGE_SIZE 4096 +#endif + +static int ifcvf_vdpa_logtype; + +struct ifcvf_internal { + struct rte_vdpa_dev_addr dev_addr; + struct rte_pci_device *pdev; + struct ifcvf_hw hw; + int vfio_container_fd; + int vfio_group_fd; + int vfio_dev_fd; + pthread_t tid; /* thread for notify relay */ + int epfd; + int vid; + int did; + uint16_t max_queues; + uint64_t features; + rte_atomic32_t started; + rte_atomic32_t dev_attached; + rte_atomic32_t running; + rte_spinlock_t lock; +}; + +struct internal_list { + TAILQ_ENTRY(internal_list) next; + struct ifcvf_internal *internal; +}; + +TAILQ_HEAD(internal_list_head, internal_list); +static struct internal_list_head internal_list = + TAILQ_HEAD_INITIALIZER(internal_list); + +static pthread_mutex_t internal_list_lock = PTHREAD_MUTEX_INITIALIZER; + +static struct internal_list * +find_internal_resource_by_did(int did) +{ + int found = 0; + struct internal_list *list; + + pthread_mutex_lock(&internal_list_lock); + + TAILQ_FOREACH(list, &internal_list, next) { + if (did == list->internal->did) { + found = 1; + break; + } + } + + pthread_mutex_unlock(&internal_list_lock); + + if (!found) + return NULL; + + return list; +} + +static struct internal_list * +find_internal_resource_by_dev(struct rte_pci_device *pdev) +{ + int found = 0; + struct internal_list *list; + + pthread_mutex_lock(&internal_list_lock); + + TAILQ_FOREACH(list, &internal_list, next) { + if (pdev == list->internal->pdev) { + found = 1; + break; + } + } + + pthread_mutex_unlock(&internal_list_lock); + + if (!found) + return NULL; + + return list; +} + +static int +ifcvf_vfio_setup(struct ifcvf_internal *internal) +{ + struct rte_pci_device *dev = internal->pdev; + char devname[RTE_DEV_NAME_MAX_LEN] = {0}; + int iommu_group_num; + int ret = 0; + int i; + + internal->vfio_dev_fd = -1; + internal->vfio_group_fd = -1; + internal->vfio_container_fd = -1; + + rte_pci_device_name(&dev->addr, devname, RTE_DEV_NAME_MAX_LEN); + rte_vfio_get_group_num(rte_pci_get_sysfs_path(), devname, + &iommu_group_num); + + internal->vfio_container_fd = rte_vfio_container_create(); + if (internal->vfio_container_fd < 0) + return -1; + + internal->vfio_group_fd = rte_vfio_container_group_bind( + internal->vfio_container_fd, iommu_group_num); + if (internal->vfio_group_fd < 0) + goto err; + + if (rte_pci_map_device(dev)) + goto err; + + internal->vfio_dev_fd = dev->intr_handle.vfio_dev_fd; + + for (i = 0; i < RTE_MIN(PCI_MAX_RESOURCE, IFCVF_PCI_MAX_RESOURCE); + i++) { + internal->hw.mem_resource[i].addr = + internal->pdev->mem_resource[i].addr; + internal->hw.mem_resource[i].phys_addr = + internal->pdev->mem_resource[i].phys_addr; + internal->hw.mem_resource[i].len = + internal->pdev->mem_resource[i].len; + } + ret = ifcvf_init_hw(&internal->hw, internal->pdev); + + return ret; + +err: + rte_vfio_container_destroy(internal->vfio_container_fd); + return -1; +} + +static int +ifcvf_dma_map(struct ifcvf_internal *internal, int do_map) +{ + uint32_t i; + int ret; + struct rte_vhost_memory *mem = NULL; + int vfio_container_fd; + + ret = rte_vhost_get_mem_table(internal->vid, &mem); + if (ret < 0) { + DRV_LOG(ERR, "failed to get VM memory layout."); + goto exit; + } + + vfio_container_fd = internal->vfio_container_fd; + + for (i = 0; i < mem->nregions; i++) { + struct rte_vhost_mem_region *reg; + + reg = &mem->regions[i]; + DRV_LOG(INFO, "%s, region %u: HVA 0x%" PRIx64 ", " + "GPA 0x%" PRIx64 ", size 0x%" PRIx64 ".", + do_map ? "DMA map" : "DMA unmap", i, + reg->host_user_addr, reg->guest_phys_addr, reg->size); + + if (do_map) { + ret = rte_vfio_container_dma_map(vfio_container_fd, + reg->host_user_addr, reg->guest_phys_addr, + reg->size); + if (ret < 0) { + DRV_LOG(ERR, "DMA map failed."); + goto exit; + } + } else { + ret = rte_vfio_container_dma_unmap(vfio_container_fd, + reg->host_user_addr, reg->guest_phys_addr, + reg->size); + if (ret < 0) { + DRV_LOG(ERR, "DMA unmap failed."); + goto exit; + } + } + } + +exit: + if (mem) + free(mem); + return ret; +} + +static uint64_t +qva_to_gpa(int vid, uint64_t qva) +{ + struct rte_vhost_memory *mem = NULL; + struct rte_vhost_mem_region *reg; + uint32_t i; + uint64_t gpa = 0; + + if (rte_vhost_get_mem_table(vid, &mem) < 0) + goto exit; + + for (i = 0; i < mem->nregions; i++) { + reg = &mem->regions[i]; + + if (qva >= reg->host_user_addr && + qva < reg->host_user_addr + reg->size) { + gpa = qva - reg->host_user_addr + reg->guest_phys_addr; + break; + } + } + +exit: + if (mem) + free(mem); + return gpa; +} + +static int +vdpa_ifcvf_start(struct ifcvf_internal *internal) +{ + struct ifcvf_hw *hw = &internal->hw; + int i, nr_vring; + int vid; + struct rte_vhost_vring vq; + uint64_t gpa; + + vid = internal->vid; + nr_vring = rte_vhost_get_vring_num(vid); + rte_vhost_get_negotiated_features(vid, &hw->req_features); + + for (i = 0; i < nr_vring; i++) { + rte_vhost_get_vhost_vring(vid, i, &vq); + gpa = qva_to_gpa(vid, (uint64_t)(uintptr_t)vq.desc); + if (gpa == 0) { + DRV_LOG(ERR, "Fail to get GPA for descriptor ring."); + return -1; + } + hw->vring[i].desc = gpa; + + gpa = qva_to_gpa(vid, (uint64_t)(uintptr_t)vq.avail); + if (gpa == 0) { + DRV_LOG(ERR, "Fail to get GPA for available ring."); + return -1; + } + hw->vring[i].avail = gpa; + + gpa = qva_to_gpa(vid, (uint64_t)(uintptr_t)vq.used); + if (gpa == 0) { + DRV_LOG(ERR, "Fail to get GPA for used ring."); + return -1; + } + hw->vring[i].used = gpa; + + hw->vring[i].size = vq.size; + rte_vhost_get_vring_base(vid, i, &hw->vring[i].last_avail_idx, + &hw->vring[i].last_used_idx); + } + hw->nr_vring = i; + + return ifcvf_start_hw(&internal->hw); +} + +static void +vdpa_ifcvf_stop(struct ifcvf_internal *internal) +{ + struct ifcvf_hw *hw = &internal->hw; + uint32_t i; + int vid; + + vid = internal->vid; + ifcvf_stop_hw(hw); + + for (i = 0; i < hw->nr_vring; i++) + rte_vhost_set_vring_base(vid, i, hw->vring[i].last_avail_idx, + hw->vring[i].last_used_idx); +} + +#define MSIX_IRQ_SET_BUF_LEN (sizeof(struct vfio_irq_set) + \ + sizeof(int) * (IFCVF_MAX_QUEUES * 2 + 1)) +static int +vdpa_enable_vfio_intr(struct ifcvf_internal *internal) +{ + int ret; + uint32_t i, nr_vring; + char irq_set_buf[MSIX_IRQ_SET_BUF_LEN]; + struct vfio_irq_set *irq_set; + int *fd_ptr; + struct rte_vhost_vring vring; + + nr_vring = rte_vhost_get_vring_num(internal->vid); + + irq_set = (struct vfio_irq_set *)irq_set_buf; + irq_set->argsz = sizeof(irq_set_buf); + irq_set->count = nr_vring + 1; + irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | + VFIO_IRQ_SET_ACTION_TRIGGER; + irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX; + irq_set->start = 0; + fd_ptr = (int *)&irq_set->data; + fd_ptr[RTE_INTR_VEC_ZERO_OFFSET] = internal->pdev->intr_handle.fd; + + for (i = 0; i < nr_vring; i++) { + rte_vhost_get_vhost_vring(internal->vid, i, &vring); + fd_ptr[RTE_INTR_VEC_RXTX_OFFSET + i] = vring.callfd; + } + + ret = ioctl(internal->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set); + if (ret) { + DRV_LOG(ERR, "Error enabling MSI-X interrupts: %s", + strerror(errno)); + return -1; + } + + return 0; +} + +static int +vdpa_disable_vfio_intr(struct ifcvf_internal *internal) +{ + int ret; + char irq_set_buf[MSIX_IRQ_SET_BUF_LEN]; + struct vfio_irq_set *irq_set; + + irq_set = (struct vfio_irq_set *)irq_set_buf; + irq_set->argsz = sizeof(irq_set_buf); + irq_set->count = 0; + irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER; + irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX; + irq_set->start = 0; + + ret = ioctl(internal->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set); + if (ret) { + DRV_LOG(ERR, "Error disabling MSI-X interrupts: %s", + strerror(errno)); + return -1; + } + + return 0; +} + +static void * +notify_relay(void *arg) +{ + int i, kickfd, epfd, nfds = 0; + uint32_t qid, q_num; + struct epoll_event events[IFCVF_MAX_QUEUES * 2]; + struct epoll_event ev; + uint64_t buf; + int nbytes; + struct rte_vhost_vring vring; + struct ifcvf_internal *internal = (struct ifcvf_internal *)arg; + struct ifcvf_hw *hw = &internal->hw; + + q_num = rte_vhost_get_vring_num(internal->vid); + + epfd = epoll_create(IFCVF_MAX_QUEUES * 2); + if (epfd < 0) { + DRV_LOG(ERR, "failed to create epoll instance."); + return NULL; + } + internal->epfd = epfd; + + for (qid = 0; qid < q_num; qid++) { + ev.events = EPOLLIN | EPOLLPRI; + rte_vhost_get_vhost_vring(internal->vid, qid, &vring); + ev.data.u64 = qid | (uint64_t)vring.kickfd << 32; + if (epoll_ctl(epfd, EPOLL_CTL_ADD, vring.kickfd, &ev) < 0) { + DRV_LOG(ERR, "epoll add error: %s", strerror(errno)); + return NULL; + } + } + + for (;;) { + nfds = epoll_wait(epfd, events, q_num, -1); + if (nfds < 0) { + if (errno == EINTR) + continue; + DRV_LOG(ERR, "epoll_wait return fail\n"); + return NULL; + } + + for (i = 0; i < nfds; i++) { + qid = events[i].data.u32; + kickfd = (uint32_t)(events[i].data.u64 >> 32); + do { + nbytes = read(kickfd, &buf, 8); + if (nbytes < 0) { + if (errno == EINTR || + errno == EWOULDBLOCK || + errno == EAGAIN) + continue; + DRV_LOG(INFO, "Error reading " + "kickfd: %s", + strerror(errno)); + } + break; + } while (1); + + ifcvf_notify_queue(hw, qid); + } + } + + return NULL; +} + +static int +setup_notify_relay(struct ifcvf_internal *internal) +{ + int ret; + + ret = pthread_create(&internal->tid, NULL, notify_relay, + (void *)internal); + if (ret) { + DRV_LOG(ERR, "failed to create notify relay pthread."); + return -1; + } + return 0; +} + +static int +unset_notify_relay(struct ifcvf_internal *internal) +{ + void *status; + + if (internal->tid) { + pthread_cancel(internal->tid); + pthread_join(internal->tid, &status); + } + internal->tid = 0; + + if (internal->epfd >= 0) + close(internal->epfd); + internal->epfd = -1; + + return 0; +} + +static int +update_datapath(struct ifcvf_internal *internal) +{ + int ret; + + rte_spinlock_lock(&internal->lock); + + if (!rte_atomic32_read(&internal->running) && + (rte_atomic32_read(&internal->started) && + rte_atomic32_read(&internal->dev_attached))) { + ret = ifcvf_dma_map(internal, 1); + if (ret) + goto err; + + ret = vdpa_enable_vfio_intr(internal); + if (ret) + goto err; + + ret = setup_notify_relay(internal); + if (ret) + goto err; + + ret = vdpa_ifcvf_start(internal); + if (ret) + goto err; + + rte_atomic32_set(&internal->running, 1); + } else if (rte_atomic32_read(&internal->running) && + (!rte_atomic32_read(&internal->started) || + !rte_atomic32_read(&internal->dev_attached))) { + vdpa_ifcvf_stop(internal); + + ret = unset_notify_relay(internal); + if (ret) + goto err; + + ret = vdpa_disable_vfio_intr(internal); + if (ret) + goto err; + + ret = ifcvf_dma_map(internal, 0); + if (ret) + goto err; + + rte_atomic32_set(&internal->running, 0); + } + + rte_spinlock_unlock(&internal->lock); + return 0; +err: + rte_spinlock_unlock(&internal->lock); + return ret; +} + +static int +ifcvf_dev_config(int vid) +{ + int did; + struct internal_list *list; + struct ifcvf_internal *internal; + + did = rte_vhost_get_vdpa_device_id(vid); + list = find_internal_resource_by_did(did); + if (list == NULL) { + DRV_LOG(ERR, "Invalid device id: %d", did); + return -1; + } + + internal = list->internal; + internal->vid = vid; + rte_atomic32_set(&internal->dev_attached, 1); + update_datapath(internal); + + return 0; +} + +static int +ifcvf_dev_close(int vid) +{ + int did; + struct internal_list *list; + struct ifcvf_internal *internal; + + did = rte_vhost_get_vdpa_device_id(vid); + list = find_internal_resource_by_did(did); + if (list == NULL) { + DRV_LOG(ERR, "Invalid device id: %d", did); + return -1; + } + + internal = list->internal; + rte_atomic32_set(&internal->dev_attached, 0); + update_datapath(internal); + + return 0; +} + +static int +ifcvf_get_vfio_group_fd(int vid) +{ + int did; + struct internal_list *list; + + did = rte_vhost_get_vdpa_device_id(vid); + list = find_internal_resource_by_did(did); + if (list == NULL) { + DRV_LOG(ERR, "Invalid device id: %d", did); + return -1; + } + + return list->internal->vfio_group_fd; +} + +static int +ifcvf_get_vfio_device_fd(int vid) +{ + int did; + struct internal_list *list; + + did = rte_vhost_get_vdpa_device_id(vid); + list = find_internal_resource_by_did(did); + if (list == NULL) { + DRV_LOG(ERR, "Invalid device id: %d", did); + return -1; + } + + return list->internal->vfio_dev_fd; +} + +static int +ifcvf_get_notify_area(int vid, int qid, uint64_t *offset, uint64_t *size) +{ + int did; + struct internal_list *list; + struct ifcvf_internal *internal; + struct vfio_region_info reg = { .argsz = sizeof(reg) }; + int ret; + + did = rte_vhost_get_vdpa_device_id(vid); + list = find_internal_resource_by_did(did); + if (list == NULL) { + DRV_LOG(ERR, "Invalid device id: %d", did); + return -1; + } + + internal = list->internal; + + reg.index = ifcvf_get_notify_region(&internal->hw); + ret = ioctl(internal->vfio_dev_fd, VFIO_DEVICE_GET_REGION_INFO, ®); + if (ret) { + DRV_LOG(ERR, "Get not get device region info: %s", + strerror(errno)); + return -1; + } + + *offset = ifcvf_get_queue_notify_off(&internal->hw, qid) + reg.offset; + *size = 0x1000; + + return 0; +} + +static int +ifcvf_get_queue_num(int did, uint32_t *queue_num) +{ + struct internal_list *list; + + list = find_internal_resource_by_did(did); + if (list == NULL) { + DRV_LOG(ERR, "Invalid device id: %d", did); + return -1; + } + + *queue_num = list->internal->max_queues; + + return 0; +} + +static int +ifcvf_get_vdpa_features(int did, uint64_t *features) +{ + struct internal_list *list; + + list = find_internal_resource_by_did(did); + if (list == NULL) { + DRV_LOG(ERR, "Invalid device id: %d", did); + return -1; + } + + *features = list->internal->features; + + return 0; +} + +#define VDPA_SUPPORTED_PROTOCOL_FEATURES \ + (1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK | \ + 1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ | \ + 1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD | \ + 1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER | \ + 1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD) +static int +ifcvf_get_protocol_features(int did __rte_unused, uint64_t *features) +{ + *features = VDPA_SUPPORTED_PROTOCOL_FEATURES; + return 0; +} + +struct rte_vdpa_dev_ops ifcvf_ops = { + .get_queue_num = ifcvf_get_queue_num, + .get_features = ifcvf_get_vdpa_features, + .get_protocol_features = ifcvf_get_protocol_features, + .dev_conf = ifcvf_dev_config, + .dev_close = ifcvf_dev_close, + .set_vring_state = NULL, + .set_features = NULL, + .migration_done = NULL, + .get_vfio_group_fd = ifcvf_get_vfio_group_fd, + .get_vfio_device_fd = ifcvf_get_vfio_device_fd, + .get_notify_area = ifcvf_get_notify_area, +}; + +static int +ifcvf_pci_probe(struct rte_pci_driver *pci_drv __rte_unused, + struct rte_pci_device *pci_dev) +{ + uint64_t features; + struct ifcvf_internal *internal = NULL; + struct internal_list *list = NULL; + + if (rte_eal_process_type() != RTE_PROC_PRIMARY) + return 0; + + list = rte_zmalloc("ifcvf", sizeof(*list), 0); + if (list == NULL) + goto error; + + internal = rte_zmalloc("ifcvf", sizeof(*internal), 0); + if (internal == NULL) + goto error; + + internal->pdev = pci_dev; + rte_spinlock_init(&internal->lock); + if (ifcvf_vfio_setup(internal) < 0) + return -1; + + internal->max_queues = IFCVF_MAX_QUEUES; + features = ifcvf_get_features(&internal->hw); + internal->features = (features & + ~(1ULL << VIRTIO_F_IOMMU_PLATFORM)) | + (1ULL << VHOST_USER_F_PROTOCOL_FEATURES); + + internal->dev_addr.pci_addr = pci_dev->addr; + internal->dev_addr.type = PCI_ADDR; + list->internal = internal; + + pthread_mutex_lock(&internal_list_lock); + TAILQ_INSERT_TAIL(&internal_list, list, next); + pthread_mutex_unlock(&internal_list_lock); + + internal->did = rte_vdpa_register_device(&internal->dev_addr, + &ifcvf_ops); + if (internal->did < 0) + goto error; + + rte_atomic32_set(&internal->started, 1); + update_datapath(internal); + + return 0; + +error: + rte_free(list); + rte_free(internal); + return -1; +} + +static int +ifcvf_pci_remove(struct rte_pci_device *pci_dev) +{ + struct ifcvf_internal *internal; + struct internal_list *list; + + if (rte_eal_process_type() != RTE_PROC_PRIMARY) + return 0; + + list = find_internal_resource_by_dev(pci_dev); + if (list == NULL) { + DRV_LOG(ERR, "Invalid device: %s", pci_dev->name); + return -1; + } + + internal = list->internal; + rte_atomic32_set(&internal->started, 0); + update_datapath(internal); + + rte_pci_unmap_device(internal->pdev); + rte_vfio_container_destroy(internal->vfio_container_fd); + rte_vdpa_unregister_device(internal->did); + + pthread_mutex_lock(&internal_list_lock); + TAILQ_REMOVE(&internal_list, list, next); + pthread_mutex_unlock(&internal_list_lock); + + rte_free(list); + rte_free(internal); + + return 0; +} + +/* + * IFCVF has the same vendor ID and device ID as virtio net PCI + * device, with its specific subsystem vendor ID and device ID. + */ +static const struct rte_pci_id pci_id_ifcvf_map[] = { + { .class_id = RTE_CLASS_ANY_ID, + .vendor_id = IFCVF_VENDOR_ID, + .device_id = IFCVF_DEVICE_ID, + .subsystem_vendor_id = IFCVF_SUBSYS_VENDOR_ID, + .subsystem_device_id = IFCVF_SUBSYS_DEVICE_ID, + }, + + { .vendor_id = 0, /* sentinel */ + }, +}; + +static struct rte_pci_driver rte_ifcvf_vdpa = { + .id_table = pci_id_ifcvf_map, + .drv_flags = 0, + .probe = ifcvf_pci_probe, + .remove = ifcvf_pci_remove, +}; + +RTE_PMD_REGISTER_PCI(net_ifcvf, rte_ifcvf_vdpa); +RTE_PMD_REGISTER_PCI_TABLE(net_ifcvf, pci_id_ifcvf_map); +RTE_PMD_REGISTER_KMOD_DEP(net_ifcvf, "* vfio-pci"); + +RTE_INIT(ifcvf_vdpa_init_log) +{ + ifcvf_vdpa_logtype = rte_log_register("pmd.net.ifcvf_vdpa"); + if (ifcvf_vdpa_logtype >= 0) + rte_log_set_level(ifcvf_vdpa_logtype, RTE_LOG_NOTICE); +} |