--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <assert.h>
+#ifdef RTE_LIBRTE_VHOST_NUMA
+#include <numaif.h>
+#endif
+
+#include <rte_common.h>
+#include <rte_malloc.h>
+#include <rte_log.h>
+
+#include "vhost.h"
+#include "vhost_user.h"
+
+static const char *vhost_message_str[VHOST_USER_MAX] = {
+ [VHOST_USER_NONE] = "VHOST_USER_NONE",
+ [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
+ [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
+ [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
+ [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
+ [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
+ [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
+ [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
+ [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
+ [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
+ [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
+ [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
+ [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
+ [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
+ [VHOST_USER_SET_VRING_ERR] = "VHOST_USER_SET_VRING_ERR",
+ [VHOST_USER_GET_PROTOCOL_FEATURES] = "VHOST_USER_GET_PROTOCOL_FEATURES",
+ [VHOST_USER_SET_PROTOCOL_FEATURES] = "VHOST_USER_SET_PROTOCOL_FEATURES",
+ [VHOST_USER_GET_QUEUE_NUM] = "VHOST_USER_GET_QUEUE_NUM",
+ [VHOST_USER_SET_VRING_ENABLE] = "VHOST_USER_SET_VRING_ENABLE",
+ [VHOST_USER_SEND_RARP] = "VHOST_USER_SEND_RARP",
+};
+
+static uint64_t
+get_blk_size(int fd)
+{
+ struct stat stat;
+ int ret;
+
+ ret = fstat(fd, &stat);
+ return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
+}
+
+static void
+free_mem_region(struct virtio_net *dev)
+{
+ uint32_t i;
+ struct virtio_memory_region *reg;
+
+ if (!dev || !dev->mem)
+ return;
+
+ for (i = 0; i < dev->mem->nregions; i++) {
+ reg = &dev->mem->regions[i];
+ if (reg->host_user_addr) {
+ munmap(reg->mmap_addr, reg->mmap_size);
+ close(reg->fd);
+ }
+ }
+}
+
+void
+vhost_backend_cleanup(struct virtio_net *dev)
+{
+ if (dev->mem) {
+ free_mem_region(dev);
+ rte_free(dev->mem);
+ dev->mem = NULL;
+ }
+ if (dev->log_addr) {
+ munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
+ dev->log_addr = 0;
+ }
+}
+
+/*
+ * This function just returns success at the moment unless
+ * the device hasn't been initialised.
+ */
+static int
+vhost_user_set_owner(void)
+{
+ return 0;
+}
+
+static int
+vhost_user_reset_owner(struct virtio_net *dev)
+{
+ if (dev->flags & VIRTIO_DEV_RUNNING) {
+ dev->flags &= ~VIRTIO_DEV_RUNNING;
+ notify_ops->destroy_device(dev->vid);
+ }
+
+ cleanup_device(dev, 0);
+ reset_device(dev);
+ return 0;
+}
+
+/*
+ * The features that we support are requested.
+ */
+static uint64_t
+vhost_user_get_features(void)
+{
+ return VHOST_FEATURES;
+}
+
+/*
+ * We receive the negotiated features supported by us and the virtio device.
+ */
+static int
+vhost_user_set_features(struct virtio_net *dev, uint64_t features)
+{
+ if (features & ~VHOST_FEATURES)
+ return -1;
+
+ dev->features = features;
+ if (dev->features &
+ ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
+ dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+ } else {
+ dev->vhost_hlen = sizeof(struct virtio_net_hdr);
+ }
+ LOG_DEBUG(VHOST_CONFIG,
+ "(%d) mergeable RX buffers %s, virtio 1 %s\n",
+ dev->vid,
+ (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
+ (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
+
+ return 0;
+}
+
+/*
+ * The virtio device sends us the size of the descriptor ring.
+ */
+static int
+vhost_user_set_vring_num(struct virtio_net *dev,
+ struct vhost_vring_state *state)
+{
+ struct vhost_virtqueue *vq = dev->virtqueue[state->index];
+
+ vq->size = state->num;
+
+ if (dev->dequeue_zero_copy) {
+ vq->nr_zmbuf = 0;
+ vq->last_zmbuf_idx = 0;
+ vq->zmbuf_size = vq->size;
+ vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size *
+ sizeof(struct zcopy_mbuf), 0);
+ if (vq->zmbufs == NULL) {
+ RTE_LOG(WARNING, VHOST_CONFIG,
+ "failed to allocate mem for zero copy; "
+ "zero copy is force disabled\n");
+ dev->dequeue_zero_copy = 0;
+ }
+ }
+
+ vq->shadow_used_ring = rte_malloc(NULL,
+ vq->size * sizeof(struct vring_used_elem),
+ RTE_CACHE_LINE_SIZE);
+ if (!vq->shadow_used_ring) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "failed to allocate memory for shadow used ring.\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
+ * same numa node as the memory of vring descriptor.
+ */
+#ifdef RTE_LIBRTE_VHOST_NUMA
+static struct virtio_net*
+numa_realloc(struct virtio_net *dev, int index)
+{
+ int oldnode, newnode;
+ struct virtio_net *old_dev;
+ struct vhost_virtqueue *old_vq, *vq;
+ int ret;
+
+ /*
+ * vq is allocated on pairs, we should try to do realloc
+ * on first queue of one queue pair only.
+ */
+ if (index % VIRTIO_QNUM != 0)
+ return dev;
+
+ old_dev = dev;
+ vq = old_vq = dev->virtqueue[index];
+
+ ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
+ MPOL_F_NODE | MPOL_F_ADDR);
+
+ /* check if we need to reallocate vq */
+ ret |= get_mempolicy(&oldnode, NULL, 0, old_vq,
+ MPOL_F_NODE | MPOL_F_ADDR);
+ if (ret) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "Unable to get vq numa information.\n");
+ return dev;
+ }
+ if (oldnode != newnode) {
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "reallocate vq from %d to %d node\n", oldnode, newnode);
+ vq = rte_malloc_socket(NULL, sizeof(*vq) * VIRTIO_QNUM, 0,
+ newnode);
+ if (!vq)
+ return dev;
+
+ memcpy(vq, old_vq, sizeof(*vq) * VIRTIO_QNUM);
+ rte_free(old_vq);
+ }
+
+ /* check if we need to reallocate dev */
+ ret = get_mempolicy(&oldnode, NULL, 0, old_dev,
+ MPOL_F_NODE | MPOL_F_ADDR);
+ if (ret) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "Unable to get dev numa information.\n");
+ goto out;
+ }
+ if (oldnode != newnode) {
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "reallocate dev from %d to %d node\n",
+ oldnode, newnode);
+ dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode);
+ if (!dev) {
+ dev = old_dev;
+ goto out;
+ }
+
+ memcpy(dev, old_dev, sizeof(*dev));
+ rte_free(old_dev);
+ }
+
+out:
+ dev->virtqueue[index] = vq;
+ dev->virtqueue[index + 1] = vq + 1;
+ vhost_devices[dev->vid] = dev;
+
+ return dev;
+}
+#else
+static struct virtio_net*
+numa_realloc(struct virtio_net *dev, int index __rte_unused)
+{
+ return dev;
+}
+#endif
+
+/*
+ * Converts QEMU virtual address to Vhost virtual address. This function is
+ * used to convert the ring addresses to our address space.
+ */
+static uint64_t
+qva_to_vva(struct virtio_net *dev, uint64_t qva)
+{
+ struct virtio_memory_region *reg;
+ uint32_t i;
+
+ /* Find the region where the address lives. */
+ for (i = 0; i < dev->mem->nregions; i++) {
+ reg = &dev->mem->regions[i];
+
+ if (qva >= reg->guest_user_addr &&
+ qva < reg->guest_user_addr + reg->size) {
+ return qva - reg->guest_user_addr +
+ reg->host_user_addr;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * The virtio device sends us the desc, used and avail ring addresses.
+ * This function then converts these to our address space.
+ */
+static int
+vhost_user_set_vring_addr(struct virtio_net *dev, struct vhost_vring_addr *addr)
+{
+ struct vhost_virtqueue *vq;
+
+ if (dev->mem == NULL)
+ return -1;
+
+ /* addr->index refers to the queue index. The txq 1, rxq is 0. */
+ vq = dev->virtqueue[addr->index];
+
+ /* The addresses are converted from QEMU virtual to Vhost virtual. */
+ vq->desc = (struct vring_desc *)(uintptr_t)qva_to_vva(dev,
+ addr->desc_user_addr);
+ if (vq->desc == 0) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "(%d) failed to find desc ring address.\n",
+ dev->vid);
+ return -1;
+ }
+
+ dev = numa_realloc(dev, addr->index);
+ vq = dev->virtqueue[addr->index];
+
+ vq->avail = (struct vring_avail *)(uintptr_t)qva_to_vva(dev,
+ addr->avail_user_addr);
+ if (vq->avail == 0) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "(%d) failed to find avail ring address.\n",
+ dev->vid);
+ return -1;
+ }
+
+ vq->used = (struct vring_used *)(uintptr_t)qva_to_vva(dev,
+ addr->used_user_addr);
+ if (vq->used == 0) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "(%d) failed to find used ring address.\n",
+ dev->vid);
+ return -1;
+ }
+
+ if (vq->last_used_idx != vq->used->idx) {
+ RTE_LOG(WARNING, VHOST_CONFIG,
+ "last_used_idx (%u) and vq->used->idx (%u) mismatches; "
+ "some packets maybe resent for Tx and dropped for Rx\n",
+ vq->last_used_idx, vq->used->idx);
+ vq->last_used_idx = vq->used->idx;
+ vq->last_avail_idx = vq->used->idx;
+ }
+
+ vq->log_guest_addr = addr->log_guest_addr;
+
+ LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",
+ dev->vid, vq->desc);
+ LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address avail: %p\n",
+ dev->vid, vq->avail);
+ LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address used: %p\n",
+ dev->vid, vq->used);
+ LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n",
+ dev->vid, vq->log_guest_addr);
+
+ return 0;
+}
+
+/*
+ * The virtio device sends us the available ring last used index.
+ */
+static int
+vhost_user_set_vring_base(struct virtio_net *dev,
+ struct vhost_vring_state *state)
+{
+ dev->virtqueue[state->index]->last_used_idx = state->num;
+ dev->virtqueue[state->index]->last_avail_idx = state->num;
+
+ return 0;
+}
+
+static void
+add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
+ uint64_t host_phys_addr, uint64_t size)
+{
+ struct guest_page *page, *last_page;
+
+ if (dev->nr_guest_pages == dev->max_guest_pages) {
+ dev->max_guest_pages *= 2;
+ dev->guest_pages = realloc(dev->guest_pages,
+ dev->max_guest_pages * sizeof(*page));
+ }
+
+ if (dev->nr_guest_pages > 0) {
+ last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
+ /* merge if the two pages are continuous */
+ if (host_phys_addr == last_page->host_phys_addr +
+ last_page->size) {
+ last_page->size += size;
+ return;
+ }
+ }
+
+ page = &dev->guest_pages[dev->nr_guest_pages++];
+ page->guest_phys_addr = guest_phys_addr;
+ page->host_phys_addr = host_phys_addr;
+ page->size = size;
+}
+
+static void
+add_guest_pages(struct virtio_net *dev, struct virtio_memory_region *reg,
+ uint64_t page_size)
+{
+ uint64_t reg_size = reg->size;
+ uint64_t host_user_addr = reg->host_user_addr;
+ uint64_t guest_phys_addr = reg->guest_phys_addr;
+ uint64_t host_phys_addr;
+ uint64_t size;
+
+ host_phys_addr = rte_mem_virt2phy((void *)(uintptr_t)host_user_addr);
+ size = page_size - (guest_phys_addr & (page_size - 1));
+ size = RTE_MIN(size, reg_size);
+
+ add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size);
+ host_user_addr += size;
+ guest_phys_addr += size;
+ reg_size -= size;
+
+ while (reg_size > 0) {
+ host_phys_addr = rte_mem_virt2phy((void *)(uintptr_t)
+ host_user_addr);
+ add_one_guest_page(dev, guest_phys_addr, host_phys_addr,
+ page_size);
+
+ host_user_addr += page_size;
+ guest_phys_addr += page_size;
+ reg_size -= page_size;
+ }
+}
+
+#ifdef RTE_LIBRTE_VHOST_DEBUG
+/* TODO: enable it only in debug mode? */
+static void
+dump_guest_pages(struct virtio_net *dev)
+{
+ uint32_t i;
+ struct guest_page *page;
+
+ for (i = 0; i < dev->nr_guest_pages; i++) {
+ page = &dev->guest_pages[i];
+
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "guest physical page region %u\n"
+ "\t guest_phys_addr: %" PRIx64 "\n"
+ "\t host_phys_addr : %" PRIx64 "\n"
+ "\t size : %" PRIx64 "\n",
+ i,
+ page->guest_phys_addr,
+ page->host_phys_addr,
+ page->size);
+ }
+}
+#else
+#define dump_guest_pages(dev)
+#endif
+
+static int
+vhost_user_set_mem_table(struct virtio_net *dev, struct VhostUserMsg *pmsg)
+{
+ struct VhostUserMemory memory = pmsg->payload.memory;
+ struct virtio_memory_region *reg;
+ void *mmap_addr;
+ uint64_t mmap_size;
+ uint64_t mmap_offset;
+ uint64_t alignment;
+ uint32_t i;
+ int fd;
+
+ /* Remove from the data plane. */
+ if (dev->flags & VIRTIO_DEV_RUNNING) {
+ dev->flags &= ~VIRTIO_DEV_RUNNING;
+ notify_ops->destroy_device(dev->vid);
+ }
+
+ if (dev->mem) {
+ free_mem_region(dev);
+ rte_free(dev->mem);
+ dev->mem = NULL;
+ }
+
+ dev->nr_guest_pages = 0;
+ if (!dev->guest_pages) {
+ dev->max_guest_pages = 8;
+ dev->guest_pages = malloc(dev->max_guest_pages *
+ sizeof(struct guest_page));
+ }
+
+ dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct virtio_memory) +
+ sizeof(struct virtio_memory_region) * memory.nregions, 0);
+ if (dev->mem == NULL) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "(%d) failed to allocate memory for dev->mem\n",
+ dev->vid);
+ return -1;
+ }
+ dev->mem->nregions = memory.nregions;
+
+ for (i = 0; i < memory.nregions; i++) {
+ fd = pmsg->fds[i];
+ reg = &dev->mem->regions[i];
+
+ reg->guest_phys_addr = memory.regions[i].guest_phys_addr;
+ reg->guest_user_addr = memory.regions[i].userspace_addr;
+ reg->size = memory.regions[i].memory_size;
+ reg->fd = fd;
+
+ mmap_offset = memory.regions[i].mmap_offset;
+ mmap_size = reg->size + mmap_offset;
+
+ /* mmap() without flag of MAP_ANONYMOUS, should be called
+ * with length argument aligned with hugepagesz at older
+ * longterm version Linux, like 2.6.32 and 3.2.72, or
+ * mmap() will fail with EINVAL.
+ *
+ * to avoid failure, make sure in caller to keep length
+ * aligned.
+ */
+ alignment = get_blk_size(fd);
+ if (alignment == (uint64_t)-1) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "couldn't get hugepage size through fstat\n");
+ goto err_mmap;
+ }
+ mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
+
+ mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_POPULATE, fd, 0);
+
+ if (mmap_addr == MAP_FAILED) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "mmap region %u failed.\n", i);
+ goto err_mmap;
+ }
+
+ reg->mmap_addr = mmap_addr;
+ reg->mmap_size = mmap_size;
+ reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
+ mmap_offset;
+
+ add_guest_pages(dev, reg, alignment);
+
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "guest memory region %u, size: 0x%" PRIx64 "\n"
+ "\t guest physical addr: 0x%" PRIx64 "\n"
+ "\t guest virtual addr: 0x%" PRIx64 "\n"
+ "\t host virtual addr: 0x%" PRIx64 "\n"
+ "\t mmap addr : 0x%" PRIx64 "\n"
+ "\t mmap size : 0x%" PRIx64 "\n"
+ "\t mmap align: 0x%" PRIx64 "\n"
+ "\t mmap off : 0x%" PRIx64 "\n",
+ i, reg->size,
+ reg->guest_phys_addr,
+ reg->guest_user_addr,
+ reg->host_user_addr,
+ (uint64_t)(uintptr_t)mmap_addr,
+ mmap_size,
+ alignment,
+ mmap_offset);
+ }
+
+ dump_guest_pages(dev);
+
+ return 0;
+
+err_mmap:
+ free_mem_region(dev);
+ rte_free(dev->mem);
+ dev->mem = NULL;
+ return -1;
+}
+
+static int
+vq_is_ready(struct vhost_virtqueue *vq)
+{
+ return vq && vq->desc &&
+ vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
+ vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD;
+}
+
+static int
+virtio_is_ready(struct virtio_net *dev)
+{
+ struct vhost_virtqueue *rvq, *tvq;
+ uint32_t i;
+
+ for (i = 0; i < dev->virt_qp_nb; i++) {
+ rvq = dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_RXQ];
+ tvq = dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_TXQ];
+
+ if (!vq_is_ready(rvq) || !vq_is_ready(tvq)) {
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "virtio is not ready for processing.\n");
+ return 0;
+ }
+ }
+
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "virtio is now ready for processing.\n");
+ return 1;
+}
+
+static void
+vhost_user_set_vring_call(struct virtio_net *dev, struct VhostUserMsg *pmsg)
+{
+ struct vhost_vring_file file;
+ struct vhost_virtqueue *vq;
+ uint32_t cur_qp_idx;
+
+ file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
+ if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
+ file.fd = VIRTIO_INVALID_EVENTFD;
+ else
+ file.fd = pmsg->fds[0];
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "vring call idx:%d file:%d\n", file.index, file.fd);
+
+ /*
+ * FIXME: VHOST_SET_VRING_CALL is the first per-vring message
+ * we get, so we do vring queue pair allocation here.
+ */
+ cur_qp_idx = file.index / VIRTIO_QNUM;
+ if (cur_qp_idx + 1 > dev->virt_qp_nb) {
+ if (alloc_vring_queue_pair(dev, cur_qp_idx) < 0)
+ return;
+ }
+
+ vq = dev->virtqueue[file.index];
+ assert(vq != NULL);
+
+ if (vq->callfd >= 0)
+ close(vq->callfd);
+
+ vq->callfd = file.fd;
+}
+
+/*
+ * In vhost-user, when we receive kick message, will test whether virtio
+ * device is ready for packet processing.
+ */
+static void
+vhost_user_set_vring_kick(struct virtio_net *dev, struct VhostUserMsg *pmsg)
+{
+ struct vhost_vring_file file;
+ struct vhost_virtqueue *vq;
+
+ file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
+ if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
+ file.fd = VIRTIO_INVALID_EVENTFD;
+ else
+ file.fd = pmsg->fds[0];
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "vring kick idx:%d file:%d\n", file.index, file.fd);
+
+ vq = dev->virtqueue[file.index];
+ if (vq->kickfd >= 0)
+ close(vq->kickfd);
+ vq->kickfd = file.fd;
+
+ if (virtio_is_ready(dev) && !(dev->flags & VIRTIO_DEV_RUNNING)) {
+ if (dev->dequeue_zero_copy) {
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "dequeue zero copy is enabled\n");
+ }
+
+ if (notify_ops->new_device(dev->vid) == 0)
+ dev->flags |= VIRTIO_DEV_RUNNING;
+ }
+}
+
+static void
+free_zmbufs(struct vhost_virtqueue *vq)
+{
+ struct zcopy_mbuf *zmbuf, *next;
+
+ for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
+ zmbuf != NULL; zmbuf = next) {
+ next = TAILQ_NEXT(zmbuf, next);
+
+ rte_pktmbuf_free(zmbuf->mbuf);
+ TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
+ }
+
+ rte_free(vq->zmbufs);
+}
+
+/*
+ * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
+ */
+static int
+vhost_user_get_vring_base(struct virtio_net *dev,
+ struct vhost_vring_state *state)
+{
+ struct vhost_virtqueue *vq = dev->virtqueue[state->index];
+
+ /* We have to stop the queue (virtio) if it is running. */
+ if (dev->flags & VIRTIO_DEV_RUNNING) {
+ dev->flags &= ~VIRTIO_DEV_RUNNING;
+ notify_ops->destroy_device(dev->vid);
+ }
+
+ /* Here we are safe to get the last used index */
+ state->num = vq->last_used_idx;
+
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "vring base idx:%d file:%d\n", state->index, state->num);
+ /*
+ * Based on current qemu vhost-user implementation, this message is
+ * sent and only sent in vhost_vring_stop.
+ * TODO: cleanup the vring, it isn't usable since here.
+ */
+ if (vq->kickfd >= 0)
+ close(vq->kickfd);
+
+ vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
+
+ if (dev->dequeue_zero_copy)
+ free_zmbufs(vq);
+ rte_free(vq->shadow_used_ring);
+ vq->shadow_used_ring = NULL;
+
+ return 0;
+}
+
+/*
+ * when virtio queues are ready to work, qemu will send us to
+ * enable the virtio queue pair.
+ */
+static int
+vhost_user_set_vring_enable(struct virtio_net *dev,
+ struct vhost_vring_state *state)
+{
+ int enable = (int)state->num;
+
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "set queue enable: %d to qp idx: %d\n",
+ enable, state->index);
+
+ if (notify_ops->vring_state_changed)
+ notify_ops->vring_state_changed(dev->vid, state->index, enable);
+
+ dev->virtqueue[state->index]->enabled = enable;
+
+ return 0;
+}
+
+static void
+vhost_user_set_protocol_features(struct virtio_net *dev,
+ uint64_t protocol_features)
+{
+ if (protocol_features & ~VHOST_USER_PROTOCOL_FEATURES)
+ return;
+
+ dev->protocol_features = protocol_features;
+}
+
+static int
+vhost_user_set_log_base(struct virtio_net *dev, struct VhostUserMsg *msg)
+{
+ int fd = msg->fds[0];
+ uint64_t size, off;
+ void *addr;
+
+ if (fd < 0) {
+ RTE_LOG(ERR, VHOST_CONFIG, "invalid log fd: %d\n", fd);
+ return -1;
+ }
+
+ if (msg->size != sizeof(VhostUserLog)) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "invalid log base msg size: %"PRId32" != %d\n",
+ msg->size, (int)sizeof(VhostUserLog));
+ return -1;
+ }
+
+ size = msg->payload.log.mmap_size;
+ off = msg->payload.log.mmap_offset;
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "log mmap size: %"PRId64", offset: %"PRId64"\n",
+ size, off);
+
+ /*
+ * mmap from 0 to workaround a hugepage mmap bug: mmap will
+ * fail when offset is not page size aligned.
+ */
+ addr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ close(fd);
+ if (addr == MAP_FAILED) {
+ RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n");
+ return -1;
+ }
+
+ /*
+ * Free previously mapped log memory on occasionally
+ * multiple VHOST_USER_SET_LOG_BASE.
+ */
+ if (dev->log_addr) {
+ munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
+ }
+ dev->log_addr = (uint64_t)(uintptr_t)addr;
+ dev->log_base = dev->log_addr + off;
+ dev->log_size = size;
+
+ return 0;
+}
+
+/*
+ * An rarp packet is constructed and broadcasted to notify switches about
+ * the new location of the migrated VM, so that packets from outside will
+ * not be lost after migration.
+ *
+ * However, we don't actually "send" a rarp packet here, instead, we set
+ * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
+ */
+static int
+vhost_user_send_rarp(struct virtio_net *dev, struct VhostUserMsg *msg)
+{
+ uint8_t *mac = (uint8_t *)&msg->payload.u64;
+
+ RTE_LOG(DEBUG, VHOST_CONFIG,
+ ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
+ mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+ memcpy(dev->mac.addr_bytes, mac, 6);
+
+ /*
+ * Set the flag to inject a RARP broadcast packet at
+ * rte_vhost_dequeue_burst().
+ *
+ * rte_smp_wmb() is for making sure the mac is copied
+ * before the flag is set.
+ */
+ rte_smp_wmb();
+ rte_atomic16_set(&dev->broadcast_rarp, 1);
+
+ return 0;
+}
+
+/* return bytes# of read on success or negative val on failure. */
+static int
+read_vhost_message(int sockfd, struct VhostUserMsg *msg)
+{
+ int ret;
+
+ ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
+ msg->fds, VHOST_MEMORY_MAX_NREGIONS);
+ if (ret <= 0)
+ return ret;
+
+ if (msg && msg->size) {
+ if (msg->size > sizeof(msg->payload)) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "invalid msg size: %d\n", msg->size);
+ return -1;
+ }
+ ret = read(sockfd, &msg->payload, msg->size);
+ if (ret <= 0)
+ return ret;
+ if (ret != (int)msg->size) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "read control message failed\n");
+ return -1;
+ }
+ }
+
+ return ret;
+}
+
+static int
+send_vhost_message(int sockfd, struct VhostUserMsg *msg)
+{
+ int ret;
+
+ if (!msg)
+ return 0;
+
+ msg->flags &= ~VHOST_USER_VERSION_MASK;
+ msg->flags |= VHOST_USER_VERSION;
+ msg->flags |= VHOST_USER_REPLY_MASK;
+
+ ret = send_fd_message(sockfd, (char *)msg,
+ VHOST_USER_HDR_SIZE + msg->size, NULL, 0);
+
+ return ret;
+}
+
+int
+vhost_user_msg_handler(int vid, int fd)
+{
+ struct virtio_net *dev;
+ struct VhostUserMsg msg;
+ int ret;
+
+ dev = get_device(vid);
+ if (dev == NULL)
+ return -1;
+
+ ret = read_vhost_message(fd, &msg);
+ if (ret <= 0 || msg.request >= VHOST_USER_MAX) {
+ if (ret < 0)
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "vhost read message failed\n");
+ else if (ret == 0)
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "vhost peer closed\n");
+ else
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "vhost read incorrect message\n");
+
+ return -1;
+ }
+
+ RTE_LOG(INFO, VHOST_CONFIG, "read message %s\n",
+ vhost_message_str[msg.request]);
+ switch (msg.request) {
+ case VHOST_USER_GET_FEATURES:
+ msg.payload.u64 = vhost_user_get_features();
+ msg.size = sizeof(msg.payload.u64);
+ send_vhost_message(fd, &msg);
+ break;
+ case VHOST_USER_SET_FEATURES:
+ vhost_user_set_features(dev, msg.payload.u64);
+ break;
+
+ case VHOST_USER_GET_PROTOCOL_FEATURES:
+ msg.payload.u64 = VHOST_USER_PROTOCOL_FEATURES;
+ msg.size = sizeof(msg.payload.u64);
+ send_vhost_message(fd, &msg);
+ break;
+ case VHOST_USER_SET_PROTOCOL_FEATURES:
+ vhost_user_set_protocol_features(dev, msg.payload.u64);
+ break;
+
+ case VHOST_USER_SET_OWNER:
+ vhost_user_set_owner();
+ break;
+ case VHOST_USER_RESET_OWNER:
+ vhost_user_reset_owner(dev);
+ break;
+
+ case VHOST_USER_SET_MEM_TABLE:
+ vhost_user_set_mem_table(dev, &msg);
+ break;
+
+ case VHOST_USER_SET_LOG_BASE:
+ vhost_user_set_log_base(dev, &msg);
+
+ /* it needs a reply */
+ msg.size = sizeof(msg.payload.u64);
+ send_vhost_message(fd, &msg);
+ break;
+ case VHOST_USER_SET_LOG_FD:
+ close(msg.fds[0]);
+ RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n");
+ break;
+
+ case VHOST_USER_SET_VRING_NUM:
+ vhost_user_set_vring_num(dev, &msg.payload.state);
+ break;
+ case VHOST_USER_SET_VRING_ADDR:
+ vhost_user_set_vring_addr(dev, &msg.payload.addr);
+ break;
+ case VHOST_USER_SET_VRING_BASE:
+ vhost_user_set_vring_base(dev, &msg.payload.state);
+ break;
+
+ case VHOST_USER_GET_VRING_BASE:
+ ret = vhost_user_get_vring_base(dev, &msg.payload.state);
+ msg.size = sizeof(msg.payload.state);
+ send_vhost_message(fd, &msg);
+ break;
+
+ case VHOST_USER_SET_VRING_KICK:
+ vhost_user_set_vring_kick(dev, &msg);
+ break;
+ case VHOST_USER_SET_VRING_CALL:
+ vhost_user_set_vring_call(dev, &msg);
+ break;
+
+ case VHOST_USER_SET_VRING_ERR:
+ if (!(msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK))
+ close(msg.fds[0]);
+ RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n");
+ break;
+
+ case VHOST_USER_GET_QUEUE_NUM:
+ msg.payload.u64 = VHOST_MAX_QUEUE_PAIRS;
+ msg.size = sizeof(msg.payload.u64);
+ send_vhost_message(fd, &msg);
+ break;
+
+ case VHOST_USER_SET_VRING_ENABLE:
+ vhost_user_set_vring_enable(dev, &msg.payload.state);
+ break;
+ case VHOST_USER_SEND_RARP:
+ vhost_user_send_rarp(dev, &msg);
+ break;
+
+ default:
+ break;
+
+ }
+
+ return 0;
+}
Code Review / deb_dpdk.git / blobdiff