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-rw-r--r--src/spdk/lib/virtio/virtio_user.c621
1 files changed, 621 insertions, 0 deletions
diff --git a/src/spdk/lib/virtio/virtio_user.c b/src/spdk/lib/virtio/virtio_user.c
new file mode 100644
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--- /dev/null
+++ b/src/spdk/lib/virtio/virtio_user.c
@@ -0,0 +1,621 @@
+/*-
+ * 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 "spdk/stdinc.h"
+
+#include <sys/eventfd.h>
+
+#include <linux/virtio_scsi.h>
+
+#include <rte_config.h>
+#include <rte_malloc.h>
+#include <rte_alarm.h>
+
+#include "virtio_user/vhost.h"
+#include "spdk/string.h"
+
+#include "spdk_internal/virtio.h"
+
+#define VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES \
+ ((1ULL << VHOST_USER_PROTOCOL_F_MQ) | \
+ (1ULL << VHOST_USER_PROTOCOL_F_CONFIG))
+
+static int
+virtio_user_create_queue(struct virtio_dev *vdev, uint32_t queue_sel)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+
+ /* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_CALL come
+ * firstly because vhost depends on this msg to allocate virtqueue
+ * pair.
+ */
+ struct vhost_vring_file file;
+
+ file.index = queue_sel;
+ file.fd = dev->callfds[queue_sel];
+ return dev->ops->send_request(dev, VHOST_USER_SET_VRING_CALL, &file);
+}
+
+static int
+virtio_user_kick_queue(struct virtio_dev *vdev, uint32_t queue_sel)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+ struct vhost_vring_file file;
+ struct vhost_vring_state state;
+ struct vring *vring = &dev->vrings[queue_sel];
+ struct vhost_vring_addr addr = {
+ .index = queue_sel,
+ .desc_user_addr = (uint64_t)(uintptr_t)vring->desc,
+ .avail_user_addr = (uint64_t)(uintptr_t)vring->avail,
+ .used_user_addr = (uint64_t)(uintptr_t)vring->used,
+ .log_guest_addr = 0,
+ .flags = 0, /* disable log */
+ };
+ int rc;
+
+ state.index = queue_sel;
+ state.num = vring->num;
+ rc = dev->ops->send_request(dev, VHOST_USER_SET_VRING_NUM, &state);
+ if (rc < 0) {
+ return rc;
+ }
+
+ state.index = queue_sel;
+ state.num = 0; /* no reservation */
+ rc = dev->ops->send_request(dev, VHOST_USER_SET_VRING_BASE, &state);
+ if (rc < 0) {
+ return rc;
+ }
+
+ rc = dev->ops->send_request(dev, VHOST_USER_SET_VRING_ADDR, &addr);
+ if (rc < 0) {
+ return rc;
+ }
+
+ /* Of all per virtqueue MSGs, make sure VHOST_USER_SET_VRING_KICK comes
+ * lastly because vhost depends on this msg to judge if
+ * virtio is ready.
+ */
+ file.index = queue_sel;
+ file.fd = dev->kickfds[queue_sel];
+ return dev->ops->send_request(dev, VHOST_USER_SET_VRING_KICK, &file);
+}
+
+static int
+virtio_user_stop_queue(struct virtio_dev *vdev, uint32_t queue_sel)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+ struct vhost_vring_state state;
+
+ state.index = queue_sel;
+ state.num = 0;
+
+ return dev->ops->send_request(dev, VHOST_USER_GET_VRING_BASE, &state);
+}
+
+static int
+virtio_user_queue_setup(struct virtio_dev *vdev,
+ int (*fn)(struct virtio_dev *, uint32_t))
+{
+ uint32_t i;
+ int rc;
+
+ for (i = 0; i < vdev->max_queues; ++i) {
+ rc = fn(vdev, i);
+ if (rc < 0) {
+ SPDK_ERRLOG("setup tx vq fails: %"PRIu32".\n", i);
+ return rc;
+ }
+ }
+
+ return 0;
+}
+
+static int
+virtio_user_map_notify(void *cb_ctx, struct spdk_mem_map *map,
+ enum spdk_mem_map_notify_action action,
+ void *vaddr, size_t size)
+{
+ struct virtio_dev *vdev = cb_ctx;
+ struct virtio_user_dev *dev = vdev->ctx;
+ uint64_t features;
+ int ret;
+
+ /* We have to resend all mappings anyway, so don't bother with any
+ * page tracking.
+ */
+ ret = dev->ops->send_request(dev, VHOST_USER_SET_MEM_TABLE, NULL);
+ if (ret < 0) {
+ return ret;
+ }
+
+ /* We have to send SET_VRING_ADDR to make rte_vhost flush a pending
+ * SET_MEM_TABLE...
+ */
+ ret = virtio_user_queue_setup(vdev, virtio_user_kick_queue);
+ if (ret < 0) {
+ return ret;
+ }
+
+ /* Since we might want to use that mapping straight away, we have to
+ * make sure the guest has already processed our SET_MEM_TABLE message.
+ * F_REPLY_ACK is just a feature and the host is not obliged to
+ * support it, so we send a simple message that always has a response
+ * and we wait for that response. Messages are always processed in order.
+ */
+ return dev->ops->send_request(dev, VHOST_USER_GET_FEATURES, &features);
+}
+
+static int
+virtio_user_register_mem(struct virtio_dev *vdev)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+ const struct spdk_mem_map_ops virtio_user_map_ops = {
+ .notify_cb = virtio_user_map_notify,
+ .are_contiguous = NULL
+ };
+
+ dev->mem_map = spdk_mem_map_alloc(0, &virtio_user_map_ops, vdev);
+ if (dev->mem_map == NULL) {
+ SPDK_ERRLOG("spdk_mem_map_alloc() failed\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static void
+virtio_user_unregister_mem(struct virtio_dev *vdev)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+
+ spdk_mem_map_free(&dev->mem_map);
+}
+
+static int
+virtio_user_start_device(struct virtio_dev *vdev)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+ uint64_t host_max_queues;
+ int ret;
+
+ if ((dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MQ)) == 0 &&
+ vdev->max_queues > 1 + vdev->fixed_queues_num) {
+ SPDK_WARNLOG("%s: requested %"PRIu16" request queues, but the "
+ "host doesn't support VHOST_USER_PROTOCOL_F_MQ. "
+ "Only one request queue will be used.\n",
+ vdev->name, vdev->max_queues - vdev->fixed_queues_num);
+ vdev->max_queues = 1 + vdev->fixed_queues_num;
+ }
+
+ /* negotiate the number of I/O queues. */
+ ret = dev->ops->send_request(dev, VHOST_USER_GET_QUEUE_NUM, &host_max_queues);
+ if (ret < 0) {
+ return ret;
+ }
+
+ if (vdev->max_queues > host_max_queues + vdev->fixed_queues_num) {
+ SPDK_WARNLOG("%s: requested %"PRIu16" request queues"
+ "but only %"PRIu64" available\n",
+ vdev->name, vdev->max_queues - vdev->fixed_queues_num,
+ host_max_queues);
+ vdev->max_queues = host_max_queues;
+ }
+
+ /* tell vhost to create queues */
+ ret = virtio_user_queue_setup(vdev, virtio_user_create_queue);
+ if (ret < 0) {
+ return ret;
+ }
+
+ ret = virtio_user_register_mem(vdev);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return 0;
+}
+
+static int
+virtio_user_stop_device(struct virtio_dev *vdev)
+{
+ int ret;
+
+ ret = virtio_user_queue_setup(vdev, virtio_user_stop_queue);
+ /* a queue might fail to stop for various reasons, e.g. socket
+ * connection going down, but this mustn't prevent us from freeing
+ * the mem map.
+ */
+ virtio_user_unregister_mem(vdev);
+ return ret;
+}
+
+static int
+virtio_user_dev_setup(struct virtio_dev *vdev)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+ uint16_t i;
+
+ dev->vhostfd = -1;
+
+ for (i = 0; i < SPDK_VIRTIO_MAX_VIRTQUEUES; ++i) {
+ dev->callfds[i] = -1;
+ dev->kickfds[i] = -1;
+ }
+
+ dev->ops = &ops_user;
+
+ return dev->ops->setup(dev);
+}
+
+static int
+virtio_user_read_dev_config(struct virtio_dev *vdev, size_t offset,
+ void *dst, int length)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+ struct vhost_user_config cfg = {0};
+ int rc;
+
+ if ((dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_CONFIG)) == 0) {
+ return -ENOTSUP;
+ }
+
+ cfg.offset = 0;
+ cfg.size = VHOST_USER_MAX_CONFIG_SIZE;
+
+ rc = dev->ops->send_request(dev, VHOST_USER_GET_CONFIG, &cfg);
+ if (rc < 0) {
+ SPDK_ERRLOG("get_config failed: %s\n", spdk_strerror(-rc));
+ return rc;
+ }
+
+ memcpy(dst, cfg.region + offset, length);
+ return 0;
+}
+
+static int
+virtio_user_write_dev_config(struct virtio_dev *vdev, size_t offset,
+ const void *src, int length)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+ struct vhost_user_config cfg = {0};
+ int rc;
+
+ if ((dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_CONFIG)) == 0) {
+ return -ENOTSUP;
+ }
+
+ cfg.offset = offset;
+ cfg.size = length;
+ memcpy(cfg.region, src, length);
+
+ rc = dev->ops->send_request(dev, VHOST_USER_SET_CONFIG, &cfg);
+ if (rc < 0) {
+ SPDK_ERRLOG("set_config failed: %s\n", spdk_strerror(-rc));
+ return rc;
+ }
+
+ return 0;
+}
+
+static void
+virtio_user_set_status(struct virtio_dev *vdev, uint8_t status)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+ int rc = 0;
+
+ if ((dev->status & VIRTIO_CONFIG_S_NEEDS_RESET) &&
+ status != VIRTIO_CONFIG_S_RESET) {
+ rc = -1;
+ } else if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
+ rc = virtio_user_start_device(vdev);
+ } else if (status == VIRTIO_CONFIG_S_RESET &&
+ (dev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ rc = virtio_user_stop_device(vdev);
+ }
+
+ if (rc != 0) {
+ dev->status |= VIRTIO_CONFIG_S_NEEDS_RESET;
+ } else {
+ dev->status = status;
+ }
+}
+
+static uint8_t
+virtio_user_get_status(struct virtio_dev *vdev)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+
+ return dev->status;
+}
+
+static uint64_t
+virtio_user_get_features(struct virtio_dev *vdev)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+ uint64_t features;
+ int rc;
+
+ rc = dev->ops->send_request(dev, VHOST_USER_GET_FEATURES, &features);
+ if (rc < 0) {
+ SPDK_ERRLOG("get_features failed: %s\n", spdk_strerror(-rc));
+ return 0;
+ }
+
+ return features;
+}
+
+static int
+virtio_user_set_features(struct virtio_dev *vdev, uint64_t features)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+ uint64_t protocol_features;
+ int ret;
+
+ ret = dev->ops->send_request(dev, VHOST_USER_SET_FEATURES, &features);
+ if (ret < 0) {
+ return ret;
+ }
+
+ vdev->negotiated_features = features;
+ vdev->modern = virtio_dev_has_feature(vdev, VIRTIO_F_VERSION_1);
+
+ if (!virtio_dev_has_feature(vdev, VHOST_USER_F_PROTOCOL_FEATURES)) {
+ /* nothing else to do */
+ return 0;
+ }
+
+ ret = dev->ops->send_request(dev, VHOST_USER_GET_PROTOCOL_FEATURES, &protocol_features);
+ if (ret < 0) {
+ return ret;
+ }
+
+ protocol_features &= VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES;
+ ret = dev->ops->send_request(dev, VHOST_USER_SET_PROTOCOL_FEATURES, &protocol_features);
+ if (ret < 0) {
+ return ret;
+ }
+
+ dev->protocol_features = protocol_features;
+ return 0;
+}
+
+static uint16_t
+virtio_user_get_queue_size(struct virtio_dev *vdev, uint16_t queue_id)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+
+ /* Currently each queue has same queue size */
+ return dev->queue_size;
+}
+
+static int
+virtio_user_setup_queue(struct virtio_dev *vdev, struct virtqueue *vq)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+ struct vhost_vring_state state;
+ uint16_t queue_idx = vq->vq_queue_index;
+ void *queue_mem;
+ uint64_t desc_addr, avail_addr, used_addr;
+ int callfd, kickfd, rc;
+
+ if (dev->callfds[queue_idx] != -1 || dev->kickfds[queue_idx] != -1) {
+ SPDK_ERRLOG("queue %"PRIu16" already exists\n", queue_idx);
+ return -EEXIST;
+ }
+
+ /* May use invalid flag, but some backend uses kickfd and
+ * callfd as criteria to judge if dev is alive. so finally we
+ * use real event_fd.
+ */
+ callfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
+ if (callfd < 0) {
+ SPDK_ERRLOG("callfd error, %s\n", spdk_strerror(errno));
+ return -errno;
+ }
+
+ kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
+ if (kickfd < 0) {
+ SPDK_ERRLOG("kickfd error, %s\n", spdk_strerror(errno));
+ close(callfd);
+ return -errno;
+ }
+
+ queue_mem = spdk_dma_zmalloc(vq->vq_ring_size, VIRTIO_PCI_VRING_ALIGN, NULL);
+ if (queue_mem == NULL) {
+ close(kickfd);
+ close(callfd);
+ return -ENOMEM;
+ }
+
+ vq->vq_ring_mem = SPDK_VTOPHYS_ERROR;
+ vq->vq_ring_virt_mem = queue_mem;
+
+ state.index = vq->vq_queue_index;
+ state.num = 0;
+
+ if (virtio_dev_has_feature(vdev, VHOST_USER_F_PROTOCOL_FEATURES)) {
+ rc = dev->ops->send_request(dev, VHOST_USER_SET_VRING_ENABLE, &state);
+ if (rc < 0) {
+ SPDK_ERRLOG("failed to send VHOST_USER_SET_VRING_ENABLE: %s\n",
+ spdk_strerror(-rc));
+ spdk_dma_free(queue_mem);
+ return -rc;
+ }
+ }
+
+ dev->callfds[queue_idx] = callfd;
+ dev->kickfds[queue_idx] = kickfd;
+
+ desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
+ avail_addr = desc_addr + vq->vq_nentries * sizeof(struct vring_desc);
+ used_addr = RTE_ALIGN_CEIL(avail_addr + offsetof(struct vring_avail,
+ ring[vq->vq_nentries]),
+ VIRTIO_PCI_VRING_ALIGN);
+
+ dev->vrings[queue_idx].num = vq->vq_nentries;
+ dev->vrings[queue_idx].desc = (void *)(uintptr_t)desc_addr;
+ dev->vrings[queue_idx].avail = (void *)(uintptr_t)avail_addr;
+ dev->vrings[queue_idx].used = (void *)(uintptr_t)used_addr;
+
+ return 0;
+}
+
+static void
+virtio_user_del_queue(struct virtio_dev *vdev, struct virtqueue *vq)
+{
+ /* For legacy devices, write 0 to VIRTIO_PCI_QUEUE_PFN port, QEMU
+ * correspondingly stops the ioeventfds, and reset the status of
+ * the device.
+ * For modern devices, set queue desc, avail, used in PCI bar to 0,
+ * not see any more behavior in QEMU.
+ *
+ * Here we just care about what information to deliver to vhost-user.
+ * So we just close ioeventfd for now.
+ */
+ struct virtio_user_dev *dev = vdev->ctx;
+
+ close(dev->callfds[vq->vq_queue_index]);
+ close(dev->kickfds[vq->vq_queue_index]);
+ dev->callfds[vq->vq_queue_index] = -1;
+ dev->kickfds[vq->vq_queue_index] = -1;
+
+ spdk_dma_free(vq->vq_ring_virt_mem);
+}
+
+static void
+virtio_user_notify_queue(struct virtio_dev *vdev, struct virtqueue *vq)
+{
+ uint64_t buf = 1;
+ struct virtio_user_dev *dev = vdev->ctx;
+
+ if (write(dev->kickfds[vq->vq_queue_index], &buf, sizeof(buf)) < 0) {
+ SPDK_ERRLOG("failed to kick backend: %s.\n", spdk_strerror(errno));
+ }
+}
+
+static void
+virtio_user_destroy(struct virtio_dev *vdev)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+
+ close(dev->vhostfd);
+ free(dev);
+}
+
+static void
+virtio_user_dump_json_info(struct virtio_dev *vdev, struct spdk_json_write_ctx *w)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+
+ spdk_json_write_name(w, "type");
+ spdk_json_write_string(w, "user");
+
+ spdk_json_write_name(w, "socket");
+ spdk_json_write_string(w, dev->path);
+}
+
+static void
+virtio_user_write_json_config(struct virtio_dev *vdev, struct spdk_json_write_ctx *w)
+{
+ struct virtio_user_dev *dev = vdev->ctx;
+
+ spdk_json_write_named_string(w, "trtype", "user");
+ spdk_json_write_named_string(w, "traddr", dev->path);
+ spdk_json_write_named_uint32(w, "vq_count", vdev->max_queues - vdev->fixed_queues_num);
+ spdk_json_write_named_uint32(w, "vq_size", virtio_dev_backend_ops(vdev)->get_queue_size(vdev, 0));
+}
+
+static const struct virtio_dev_ops virtio_user_ops = {
+ .read_dev_cfg = virtio_user_read_dev_config,
+ .write_dev_cfg = virtio_user_write_dev_config,
+ .get_status = virtio_user_get_status,
+ .set_status = virtio_user_set_status,
+ .get_features = virtio_user_get_features,
+ .set_features = virtio_user_set_features,
+ .destruct_dev = virtio_user_destroy,
+ .get_queue_size = virtio_user_get_queue_size,
+ .setup_queue = virtio_user_setup_queue,
+ .del_queue = virtio_user_del_queue,
+ .notify_queue = virtio_user_notify_queue,
+ .dump_json_info = virtio_user_dump_json_info,
+ .write_json_config = virtio_user_write_json_config,
+};
+
+int
+virtio_user_dev_init(struct virtio_dev *vdev, const char *name, const char *path,
+ uint32_t queue_size)
+{
+ struct virtio_user_dev *dev;
+ int rc;
+
+ if (name == NULL) {
+ SPDK_ERRLOG("No name gived for controller: %s\n", path);
+ return -EINVAL;
+ }
+
+ dev = calloc(1, sizeof(*dev));
+ if (dev == NULL) {
+ return -ENOMEM;
+ }
+
+ rc = virtio_dev_construct(vdev, name, &virtio_user_ops, dev);
+ if (rc != 0) {
+ SPDK_ERRLOG("Failed to init device: %s\n", path);
+ free(dev);
+ return rc;
+ }
+
+ vdev->is_hw = 0;
+
+ snprintf(dev->path, PATH_MAX, "%s", path);
+ dev->queue_size = queue_size;
+
+ rc = virtio_user_dev_setup(vdev);
+ if (rc < 0) {
+ SPDK_ERRLOG("backend set up fails\n");
+ goto err;
+ }
+
+ rc = dev->ops->send_request(dev, VHOST_USER_SET_OWNER, NULL);
+ if (rc < 0) {
+ SPDK_ERRLOG("set_owner fails: %s\n", spdk_strerror(-rc));
+ goto err;
+ }
+
+ return 0;
+
+err:
+ virtio_dev_destruct(vdev);
+ return rc;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 00:36:13 +0000