* [dpdk-dev] [PATCH v3 1/2] vhost: support inflight share memory protocol feature
2019-07-15 20:28 ` [dpdk-dev] [PATCH v3 0/2] support inflight share memory protocol feature in vhost JinYu
@ 2019-07-15 20:28 ` JinYu
2019-07-15 20:28 ` [dpdk-dev] [PATCH v3 2/2] vhost: Add vhost-user-blk example which support inflight JinYu
1 sibling, 0 replies; 3+ messages in thread
From: JinYu @ 2019-07-15 20:28 UTC (permalink / raw)
To: dev
Cc: changpeng.liu, maxime.coquelin, tiwei.bie, zhihong.wang, JinYu,
Lin Li, Xun Ni, Yu Zhang
This patch introduces two new messages VHOST_USER_GET_INFLIGHT_FD
and VHOST_USER_SET_INFLIGHT_FD to support transferring a shared
buffer between qemu and backend.
Firstly, qemu uses VHOST_USER_GET_INFLIGHT_FD to get the
shared buffer from backend. Then qemu should send it back
through VHOST_USER_SET_INFLIGHT_FD each time we start vhost-user.
This shared buffer is used to process inflight I/O when backend
reconnect.
Signed-off-by: Lin Li <lilin24@baidu.com>
Signed-off-by: Xun Ni <nixun@baidu.com>
Signed-off-by: Yu Zhang <zhangyu31@baidu.com>
Signed-off-by: Jin Yu <jin.yu@intel.com>
---
v1 - specify the APIs are split-ring only
v2 - fix APIs and judge split or packed
v3 - Add rte_vhost_ prefix and fix one issue.
---
lib/librte_vhost/rte_vhost.h | 89 +++++++
lib/librte_vhost/rte_vhost_version.map | 4 +
lib/librte_vhost/vhost.c | 163 ++++++++++++-
lib/librte_vhost/vhost.h | 32 +++
lib/librte_vhost/vhost_user.c | 316 +++++++++++++++++++++++++
lib/librte_vhost/vhost_user.h | 13 +-
6 files changed, 615 insertions(+), 2 deletions(-)
diff --git a/lib/librte_vhost/rte_vhost.h b/lib/librte_vhost/rte_vhost.h
index 0226b3eff..01a875abd 100644
--- a/lib/librte_vhost/rte_vhost.h
+++ b/lib/librte_vhost/rte_vhost.h
@@ -71,6 +71,10 @@ extern "C" {
#define VHOST_USER_PROTOCOL_F_HOST_NOTIFIER 11
#endif
+#ifndef VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD
+#define VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD 12
+#endif
+
/** Indicate whether protocol features negotiation is supported. */
#ifndef VHOST_USER_F_PROTOCOL_FEATURES
#define VHOST_USER_F_PROTOCOL_FEATURES 30
@@ -98,6 +102,25 @@ struct rte_vhost_memory {
struct rte_vhost_mem_region regions[];
};
+struct rte_vhost_resubmit_desc {
+ uint16_t index;
+ uint64_t counter;
+};
+
+struct rte_vhost_resubmit_info {
+ struct rte_vhost_resubmit_desc *resubmit_list;
+ uint16_t resubmit_num;
+};
+
+struct rte_vhost_ring_inflight_split {
+ union {
+ struct inflight_info_split *inflight_split;
+ /* TODO */
+ };
+
+ struct rte_vhost_resubmit_info *resubmit_inflight_split;
+};
+
struct rte_vhost_vring {
struct vring_desc *desc;
struct vring_avail *avail;
@@ -603,6 +626,22 @@ uint16_t rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
*/
int rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem);
+/**
+ * Get guest inflight vring info, including inflight ring and resubmit list.
+ *
+ * @param vid
+ * vhost device ID
+ * @param vring_idx
+ * vring index
+ * @param vring
+ * the structure to hold the requested inflight vring info
+ * @return
+ * 0 on success, -1 on failure
+ */
+int __rte_experimental
+rte_vhost_get_vhost_ring_inflight_split(int vid, uint16_t vring_idx,
+ struct rte_vhost_ring_inflight_split *vring);
+
/**
* Get guest vring info, including the vring address, vring size, etc.
*
@@ -631,6 +670,56 @@ int rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
*/
int rte_vhost_vring_call(int vid, uint16_t vring_idx);
+/**
+ * set inflight flag for a desc.
+ *
+ * @param vid
+ * vhost device ID
+ * @param vring_idx
+ * vring index
+ * @param idx
+ * inflight entry index
+ * @return
+ * 0 on success, -1 on failure
+ */
+int __rte_experimental
+rte_vhost_set_inflight_desc_split(int vid, uint16_t vring_idx,
+ uint16_t idx);
+
+/**
+ * clear inflight flag for a desc.
+ *
+ * @param vid
+ * vhost device ID
+ * @param vring_idx
+ * vring index
+ * @param last_used_idx
+ * next free used_idx
+ * @param idx
+ * inflight entry index
+ * @return
+ * 0 on success, -1 on failure
+ */
+int __rte_experimental
+rte_vhost_clr_inflight_desc_split(int vid, uint16_t vring_idx,
+ uint16_t last_used_idx, uint16_t idx);
+
+/**
+ * set last inflight io index.
+ *
+ * @param vid
+ * vhost device ID
+ * @param vring_idx
+ * vring index
+ * @param idx
+ * inflight entry index
+ * @return
+ * 0 on success, -1 on failure
+ */
+int __rte_experimental
+rte_vhost_set_last_inflight_io_split(int vid, uint16_t vring_idx,
+ uint16_t idx);
+
/**
* Get vhost RX queue avail count.
*
diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map
index 5f1d4a75c..57a166f4f 100644
--- a/lib/librte_vhost/rte_vhost_version.map
+++ b/lib/librte_vhost/rte_vhost_version.map
@@ -87,4 +87,8 @@ EXPERIMENTAL {
rte_vdpa_relay_vring_used;
rte_vhost_extern_callback_register;
rte_vhost_driver_set_protocol_features;
+ rte_vhost_set_inflight_desc_split;
+ rte_vhost_clr_inflight_desc_split;
+ rte_vhost_set_last_inflight_io_split;
+ rte_vhost_get_vhost_ring_inflight_split;
};
diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 981837b5d..dac641dc0 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -242,6 +242,30 @@ cleanup_vq(struct vhost_virtqueue *vq, int destroy)
close(vq->kickfd);
}
+void
+cleanup_vq_inflight_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
+{
+ if (!(dev->protocol_features &
+ (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
+ return;
+
+ if (vq_is_packed(dev)) {
+ /* TODO */
+ RTE_LOG(ERR, VHOST_CONFIG, "function only be used for split inflight.\n");
+ } else {
+ if (vq->inflight_split)
+ vq->inflight_split = NULL;
+ if (vq->resubmit_inflight_split) {
+ if (vq->resubmit_inflight_split->resubmit_list) {
+ free(vq->resubmit_inflight_split->resubmit_list);
+ vq->resubmit_inflight_split->resubmit_list = NULL;
+ }
+ free(vq->resubmit_inflight_split);
+ vq->resubmit_inflight_split = NULL;
+ }
+ }
+}
+
/*
* Unmap any memory, close any file descriptors and
* free any memory owned by a device.
@@ -253,8 +277,10 @@ cleanup_device(struct virtio_net *dev, int destroy)
vhost_backend_cleanup(dev);
- for (i = 0; i < dev->nr_vring; i++)
+ for (i = 0; i < dev->nr_vring; i++) {
cleanup_vq(dev->virtqueue[i], destroy);
+ cleanup_vq_inflight_split(dev, dev->virtqueue[i]);
+ }
}
void
@@ -726,6 +752,40 @@ rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
return 0;
}
+int
+rte_vhost_get_vhost_ring_inflight_split(int vid, uint16_t vring_idx,
+ struct rte_vhost_ring_inflight_split *vring)
+{
+ struct virtio_net *dev;
+ struct vhost_virtqueue *vq;
+ struct inflight_info_split *inflight_vring;
+
+ dev = get_device(vid);
+ if (dev == NULL || vring == NULL)
+ return -1;
+
+ if (vring_idx >= VHOST_MAX_VRING)
+ return -1;
+
+ vq = dev->virtqueue[vring_idx];
+ if (!vq)
+ return -1;
+
+ inflight_vring = vq->inflight_split;
+ if (!inflight_vring)
+ return -1;
+
+ if (vq_is_packed(dev)) {
+ /* TODO */
+ RTE_LOG(ERR, VHOST_CONFIG, "Can't be packed inflight ring.\n");
+ } else {
+ vring->inflight_split = inflight_vring;
+ vring->resubmit_inflight_split = vq->resubmit_inflight_split;
+ }
+
+ return 0;
+}
+
int
rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
struct rte_vhost_vring *vring)
@@ -781,6 +841,107 @@ rte_vhost_vring_call(int vid, uint16_t vring_idx)
return 0;
}
+int
+rte_vhost_set_inflight_desc_split(int vid, uint16_t vring_idx, uint16_t idx)
+{
+ struct virtio_net *dev;
+ struct vhost_virtqueue *vq;
+
+ dev = get_device(vid);
+ if (unlikely(!dev))
+ return -1;
+
+ if (unlikely(!(dev->protocol_features &
+ (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
+ return 0;
+
+ if (unlikely(vq_is_packed(dev)))
+ return -1;
+
+ if (unlikely(vring_idx >= VHOST_MAX_VRING))
+ return -1;
+
+ vq = dev->virtqueue[vring_idx];
+ if (unlikely(!vq))
+ return -1;
+
+ if (unlikely(!vq->inflight_split))
+ return -1;
+
+ vq->inflight_split->desc[idx].counter = vq->global_counter++;
+ vq->inflight_split->desc[idx].inflight = 1;
+ return 0;
+}
+
+int
+rte_vhost_clr_inflight_desc_split(int vid, uint16_t vring_idx,
+ uint16_t last_used_idx, uint16_t idx)
+{
+ struct virtio_net *dev;
+ struct vhost_virtqueue *vq;
+
+ dev = get_device(vid);
+ if (unlikely(!dev))
+ return -1;
+
+ if (unlikely(!(dev->protocol_features &
+ (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
+ return 0;
+
+ if (unlikely(vq_is_packed(dev)))
+ return -1;
+
+ if (unlikely(vring_idx >= VHOST_MAX_VRING))
+ return -1;
+
+ vq = dev->virtqueue[vring_idx];
+ if (unlikely(!vq))
+ return -1;
+
+ if (unlikely(!vq->inflight_split))
+ return -1;
+
+ rte_compiler_barrier();
+
+ vq->inflight_split->desc[idx].inflight = 0;
+
+ rte_compiler_barrier();
+
+ vq->inflight_split->used_idx = last_used_idx;
+ return 0;
+}
+
+int
+rte_vhost_set_last_inflight_io_split(int vid, uint16_t vring_idx, uint16_t idx)
+{
+ struct virtio_net *dev;
+ struct vhost_virtqueue *vq;
+
+ dev = get_device(vid);
+ if (unlikely(!dev))
+ return -1;
+
+ if (unlikely(!(dev->protocol_features &
+ (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
+ return 0;
+
+ if (unlikely(vq_is_packed(dev)))
+ return -1;
+
+ if (unlikely(vring_idx >= VHOST_MAX_VRING))
+ return -1;
+
+ vq = dev->virtqueue[vring_idx];
+ if (!vq)
+ return -1;
+
+ if (unlikely(!vq->inflight_split))
+ return -1;
+
+ vq->inflight_split->last_inflight_io = idx;
+ return 0;
+}
+
uint16_t
rte_vhost_avail_entries(int vid, uint16_t queue_id)
{
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 884befa85..1770754eb 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -88,6 +88,22 @@ struct vring_used_elem_packed {
uint32_t count;
};
+struct inflight_desc_split {
+ uint8_t inflight;
+ uint8_t padding[5];
+ uint16_t next;
+ uint64_t counter;
+};
+
+struct inflight_info_split {
+ uint64_t features;
+ uint16_t version;
+ uint16_t desc_num;
+ uint16_t last_inflight_io;
+ uint16_t used_idx;
+ struct inflight_desc_split desc[0];
+};
+
/**
* Structure contains variables relevant to RX/TX virtqueues.
*/
@@ -128,6 +144,14 @@ struct vhost_virtqueue {
/* Physical address of used ring, for logging */
uint64_t log_guest_addr;
+ /* inflight share memory info */
+ union {
+ struct inflight_info_split *inflight_split;
+ /* TODO */
+ };
+ struct rte_vhost_resubmit_info *resubmit_inflight_split;
+ uint64_t global_counter;
+
uint16_t nr_zmbuf;
uint16_t zmbuf_size;
uint16_t last_zmbuf_idx;
@@ -286,6 +310,12 @@ struct guest_page {
uint64_t size;
};
+struct inflight_mem_info {
+ int fd;
+ void *addr;
+ uint64_t size;
+};
+
/**
* Device structure contains all configuration information relating
* to the device.
@@ -303,6 +333,7 @@ struct virtio_net {
uint32_t nr_vring;
int dequeue_zero_copy;
struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2];
+ struct inflight_mem_info inflight_info;
#define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
char ifname[IF_NAME_SZ];
uint64_t log_size;
@@ -467,6 +498,7 @@ void vhost_destroy_device(int);
void vhost_destroy_device_notify(struct virtio_net *dev);
void cleanup_vq(struct vhost_virtqueue *vq, int destroy);
+void cleanup_vq_inflight_split(struct virtio_net *dev, struct vhost_virtqueue *vq);
void free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq);
int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx);
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index c9e29ece8..c76df099a 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -31,6 +31,8 @@
#include <sys/stat.h>
#include <sys/syscall.h>
#include <assert.h>
+#include <sys/syscall.h>
+#include <asm/unistd.h>
#ifdef RTE_LIBRTE_VHOST_NUMA
#include <numaif.h>
#endif
@@ -49,6 +51,15 @@
#define VIRTIO_MIN_MTU 68
#define VIRTIO_MAX_MTU 65535
+#define INFLIGHT_ALIGNMENT 64
+#define INFLIGHT_VERSION 0xabcd
+#define VIRTQUEUE_MAX_SIZE 1024
+
+#define CLOEXEC 0x0001U
+
+#define ALIGN_DOWN(n, m) ((n) / (m) * (m))
+#define ALIGN_UP(n, m) ALIGN_DOWN((n) + (m) - 1, (m))
+
static const char *vhost_message_str[VHOST_USER_MAX] = {
[VHOST_USER_NONE] = "VHOST_USER_NONE",
[VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
@@ -78,6 +89,8 @@ static const char *vhost_message_str[VHOST_USER_MAX] = {
[VHOST_USER_POSTCOPY_ADVISE] = "VHOST_USER_POSTCOPY_ADVISE",
[VHOST_USER_POSTCOPY_LISTEN] = "VHOST_USER_POSTCOPY_LISTEN",
[VHOST_USER_POSTCOPY_END] = "VHOST_USER_POSTCOPY_END",
+ [VHOST_USER_GET_INFLIGHT_FD] = "VHOST_USER_GET_INFLIGHT_FD",
+ [VHOST_USER_SET_INFLIGHT_FD] = "VHOST_USER_SET_INFLIGHT_FD",
};
static int send_vhost_reply(int sockfd, struct VhostUserMsg *msg);
@@ -160,6 +173,16 @@ vhost_backend_cleanup(struct virtio_net *dev)
dev->log_addr = 0;
}
+ if (dev->inflight_info.addr) {
+ munmap(dev->inflight_info.addr, dev->inflight_info.size);
+ dev->inflight_info.addr = NULL;
+ }
+
+ if (dev->inflight_info.fd > 0) {
+ close(dev->inflight_info.fd);
+ dev->inflight_info.fd = -1;
+ }
+
if (dev->slave_req_fd >= 0) {
close(dev->slave_req_fd);
dev->slave_req_fd = -1;
@@ -306,6 +329,7 @@ vhost_user_set_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
dev->virtqueue[dev->nr_vring] = NULL;
cleanup_vq(vq, 1);
+ cleanup_vq_inflight_split(dev, vq);
free_vq(dev, vq);
}
}
@@ -1165,6 +1189,202 @@ virtio_is_ready(struct virtio_net *dev)
return 1;
}
+static int mem_create(const char *name, unsigned int flags)
+{
+#ifdef __NR_memfd_create
+ return syscall(__NR_memfd_create, name, flags);
+#else
+ return -1;
+#endif
+}
+
+void *inflight_mem_alloc(const char *name, size_t size, int *fd)
+{
+ void *ptr;
+ int mfd = -1;
+ char fname[20] = "/tmp/memfd-XXXXXX";
+
+ *fd = -1;
+ mfd = mem_create(name, CLOEXEC);
+ if (mfd != -1) {
+ if (ftruncate(mfd, size) == -1) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "ftruncate fail for alloc inflight buffer\n");
+ close(mfd);
+ return NULL;
+ }
+ } else {
+ mfd = mkstemp(fname);
+ unlink(fname);
+
+ if (mfd == -1) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "mkstemp fail for alloc inflight buffer\n");
+ return NULL;
+ }
+
+ if (ftruncate(mfd, size) == -1) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "ftruncate fail for alloc inflight buffer\n");
+ close(mfd);
+ return NULL;
+ }
+ }
+
+ ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0);
+ if (ptr == MAP_FAILED) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "mmap fail for alloc inflight buffer\n");
+ close(mfd);
+ return NULL;
+ }
+
+ *fd = mfd;
+ return ptr;
+}
+
+static uint32_t get_pervq_shm_size_split(uint16_t queue_size)
+{
+ return ALIGN_UP(sizeof(struct inflight_desc_split) * queue_size +
+ sizeof(uint64_t) * 1 + sizeof(uint16_t) * 4, INFLIGHT_ALIGNMENT);
+}
+
+static int
+vhost_user_get_inflight_fd(struct virtio_net **pdev, VhostUserMsg *msg,
+ int main_fd __rte_unused)
+{
+ int fd;
+ uint64_t mmap_size;
+ void *addr;
+ uint16_t num_queues, queue_size;
+ struct virtio_net *dev = *pdev;
+
+ if (msg->size != sizeof(msg->payload.inflight)) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "Invalid get_inflight_fd message size is %d",
+ msg->size);
+ return RTE_VHOST_MSG_RESULT_ERR;
+ }
+
+ num_queues = msg->payload.inflight.num_queues;
+ queue_size = msg->payload.inflight.queue_size;
+
+ RTE_LOG(INFO, VHOST_CONFIG, "get_inflight_fd num_queues: %u\n",
+ msg->payload.inflight.num_queues);
+ RTE_LOG(INFO, VHOST_CONFIG, "get_inflight_fd queue_size: %u\n",
+ msg->payload.inflight.queue_size);
+
+ if (vq_is_packed(dev)) {
+ /* TODO */
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "Don't support the packed ring\n");
+ return RTE_VHOST_MSG_RESULT_ERR;
+ }
+ mmap_size = num_queues * get_pervq_shm_size_split(queue_size);
+
+ addr = inflight_mem_alloc("vhost-inflight", mmap_size, &fd);
+ if (!addr) {
+ RTE_LOG(ERR, VHOST_CONFIG, "Failed to alloc vhost inflight area");
+ msg->payload.inflight.mmap_size = 0;
+ return RTE_VHOST_MSG_RESULT_ERR;
+ }
+ memset(addr, 0, mmap_size);
+
+ dev->inflight_info.addr = addr;
+ dev->inflight_info.size = msg->payload.inflight.mmap_size = mmap_size;
+ dev->inflight_info.fd = msg->fds[0] = fd;
+ msg->payload.inflight.mmap_offset = 0;
+ msg->fd_num = 1;
+
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "send inflight mmap_size: %lu\n",
+ msg->payload.inflight.mmap_size);
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "send inflight mmap_offset: %lu\n",
+ msg->payload.inflight.mmap_offset);
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "send inflight fd: %d\n", msg->fds[0]);
+
+ return RTE_VHOST_MSG_RESULT_REPLY;
+}
+
+static int
+vhost_user_set_inflight_fd(struct virtio_net **pdev, VhostUserMsg *msg,
+ int main_fd __rte_unused)
+{
+ int fd, i;
+ uint64_t mmap_size, mmap_offset;
+ uint16_t num_queues, queue_size;
+ uint32_t pervq_inflight_size;
+ void *addr;
+ struct vhost_virtqueue *vq;
+ struct virtio_net *dev = *pdev;
+
+ fd = msg->fds[0];
+ if (msg->size != sizeof(msg->payload.inflight) || fd < 0) {
+ RTE_LOG(ERR, VHOST_CONFIG, "Invalid set_inflight_fd message size is %d,fd is %d\n",
+ msg->size, fd);
+ return RTE_VHOST_MSG_RESULT_ERR;
+ }
+
+ mmap_size = msg->payload.inflight.mmap_size;
+ mmap_offset = msg->payload.inflight.mmap_offset;
+ num_queues = msg->payload.inflight.num_queues;
+ queue_size = msg->payload.inflight.queue_size;
+
+ if (vq_is_packed(dev)) {
+ /* TODO */
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "Don't support the packed ring\n");
+ return RTE_VHOST_MSG_RESULT_ERR;
+ }
+ pervq_inflight_size = get_pervq_shm_size_split(queue_size);
+
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "set_inflight_fd mmap_size: %lu\n", mmap_size);
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "set_inflight_fd mmap_offset: %lu\n", mmap_offset);
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "set_inflight_fd num_queues: %u\n", num_queues);
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "set_inflight_fd queue_size: %u\n", queue_size);
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "set_inflight_fd fd: %d\n", fd);
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "set_inflight_fd pervq_inflight_size: %d\n",
+ pervq_inflight_size);
+
+ if (dev->inflight_info.addr)
+ munmap(dev->inflight_info.addr, dev->inflight_info.size);
+
+ addr = mmap(0, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
+ fd, mmap_offset);
+ if (addr == MAP_FAILED) {
+ RTE_LOG(ERR, VHOST_CONFIG, "failed to mmap share memory.\n");
+ return RTE_VHOST_MSG_RESULT_ERR;
+ }
+
+ if (dev->inflight_info.fd)
+ close(dev->inflight_info.fd);
+
+ dev->inflight_info.fd = fd;
+ dev->inflight_info.addr = addr;
+ dev->inflight_info.size = mmap_size;
+
+ for (i = 0; i < num_queues; i++) {
+ vq = dev->virtqueue[i];
+ if (vq_is_packed(dev)) {
+ /* TODO */
+ } else {
+ vq->inflight_split = (struct inflight_info_split *)addr;
+ vq->inflight_split->desc_num = queue_size;
+ }
+ addr = (void *)((char *)addr + pervq_inflight_size);
+ }
+
+ return RTE_VHOST_MSG_RESULT_OK;
+}
+
static int
vhost_user_set_vring_call(struct virtio_net **pdev, struct VhostUserMsg *msg,
int main_fd __rte_unused)
@@ -1201,6 +1421,94 @@ static int vhost_user_set_vring_err(struct virtio_net **pdev __rte_unused,
return RTE_VHOST_MSG_RESULT_OK;
}
+static int
+resubmit_desc_compare(const void *a, const void *b)
+{
+ const struct rte_vhost_resubmit_desc *desc0 =
+ (const struct rte_vhost_resubmit_desc *)a;
+ const struct rte_vhost_resubmit_desc *desc1 =
+ (const struct rte_vhost_resubmit_desc *)b;
+
+ if (desc1->counter > desc0->counter &&
+ (desc1->counter - desc0->counter) < VIRTQUEUE_MAX_SIZE * 2)
+ return 1;
+
+ return -1;
+}
+
+static int
+vhost_check_queue_inflights_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
+{
+ struct vring_used *used = vq->used;
+ uint16_t i = 0;
+ uint16_t resubmit_num = 0;
+ struct rte_vhost_resubmit_info *resubmit = NULL;
+ struct inflight_info_split *inflight_split;
+
+ if (!(dev->protocol_features &
+ (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
+ return RTE_VHOST_MSG_RESULT_OK;
+
+ if ((!vq->inflight_split))
+ return RTE_VHOST_MSG_RESULT_ERR;
+
+ if (!vq->inflight_split->version) {
+ vq->inflight_split->version = INFLIGHT_VERSION;
+ return RTE_VHOST_MSG_RESULT_OK;
+ }
+
+ inflight_split = vq->inflight_split;
+ vq->resubmit_inflight_split = NULL;
+ vq->global_counter = 0;
+
+ if (inflight_split->used_idx != used->idx) {
+ inflight_split->desc[inflight_split->last_inflight_io].inflight = 0;
+ rte_compiler_barrier();
+ inflight_split->used_idx = used->idx;
+ }
+
+ for (i = 0; i < inflight_split->desc_num; i++) {
+ if (inflight_split->desc[i].inflight == 1)
+ resubmit_num++;
+ }
+
+ vq->last_avail_idx += resubmit_num;
+
+ if (resubmit_num) {
+ resubmit = calloc(1, sizeof(struct rte_vhost_resubmit_info));
+ if (!resubmit) {
+ RTE_LOG(ERR, VHOST_CONFIG, "Failed to allocate memory for resubmit info.\n");
+ return RTE_VHOST_MSG_RESULT_ERR;
+ }
+
+ resubmit->resubmit_list = calloc(resubmit_num,
+ sizeof(struct rte_vhost_resubmit_desc));
+ if (!resubmit->resubmit_list) {
+ RTE_LOG(ERR, VHOST_CONFIG, "Failed to allocate memory for inflight desc.\n");
+ return RTE_VHOST_MSG_RESULT_ERR;
+ }
+
+ for (i = 0; i < vq->inflight_split->desc_num; i++) {
+ if (vq->inflight_split->desc[i].inflight == 1) {
+ resubmit->resubmit_list[resubmit->resubmit_num].index = i;
+ resubmit->resubmit_list[resubmit->resubmit_num].counter =
+ inflight_split->desc[i].counter;
+ resubmit->resubmit_num++;
+ }
+ }
+
+ if (resubmit->resubmit_num > 1)
+ qsort(resubmit->resubmit_list, resubmit->resubmit_num,
+ sizeof(struct rte_vhost_resubmit_desc),
+ resubmit_desc_compare);
+
+ vq->global_counter = resubmit->resubmit_list[0].counter + 1;
+ vq->resubmit_inflight_split = resubmit;
+ }
+
+ return RTE_VHOST_MSG_RESULT_OK;
+}
+
static int
vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *msg,
int main_fd __rte_unused)
@@ -1242,6 +1550,12 @@ vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *msg,
close(vq->kickfd);
vq->kickfd = file.fd;
+ if (vhost_check_queue_inflights_split(dev, vq)) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "Failed to inflights for vq: %d\n", file.index);
+ return RTE_VHOST_MSG_RESULT_ERR;
+ }
+
return RTE_VHOST_MSG_RESULT_OK;
}
@@ -1762,6 +2076,8 @@ static vhost_message_handler_t vhost_message_handlers[VHOST_USER_MAX] = {
[VHOST_USER_POSTCOPY_ADVISE] = vhost_user_set_postcopy_advise,
[VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
[VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end,
+ [VHOST_USER_GET_INFLIGHT_FD] = vhost_user_get_inflight_fd,
+ [VHOST_USER_SET_INFLIGHT_FD] = vhost_user_set_inflight_fd,
};
diff --git a/lib/librte_vhost/vhost_user.h b/lib/librte_vhost/vhost_user.h
index 2a650fe4b..99a773910 100644
--- a/lib/librte_vhost/vhost_user.h
+++ b/lib/librte_vhost/vhost_user.h
@@ -54,7 +54,9 @@ typedef enum VhostUserRequest {
VHOST_USER_POSTCOPY_ADVISE = 28,
VHOST_USER_POSTCOPY_LISTEN = 29,
VHOST_USER_POSTCOPY_END = 30,
- VHOST_USER_MAX = 31
+ VHOST_USER_GET_INFLIGHT_FD = 31,
+ VHOST_USER_SET_INFLIGHT_FD = 32,
+ VHOST_USER_MAX = 33
} VhostUserRequest;
typedef enum VhostUserSlaveRequest {
@@ -112,6 +114,13 @@ typedef struct VhostUserVringArea {
uint64_t offset;
} VhostUserVringArea;
+typedef struct VhostUserInflight {
+ uint64_t mmap_size;
+ uint64_t mmap_offset;
+ uint16_t num_queues;
+ uint16_t queue_size;
+} VhostUserInflight;
+
typedef struct VhostUserMsg {
union {
uint32_t master; /* a VhostUserRequest value */
@@ -131,6 +140,7 @@ typedef struct VhostUserMsg {
struct vhost_vring_addr addr;
VhostUserMemory memory;
VhostUserLog log;
+ VhostUserInflight inflight;
struct vhost_iotlb_msg iotlb;
VhostUserCryptoSessionParam crypto_session;
VhostUserVringArea area;
@@ -148,6 +158,7 @@ typedef struct VhostUserMsg {
/* vhost_user.c */
int vhost_user_msg_handler(int vid, int fd);
int vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm);
+void *inflight_mem_alloc(const char *name, size_t size, int *fd);
/* socket.c */
int read_fd_message(int sockfd, char *buf, int buflen, int *fds, int max_fds,
--
2.17.2
^ permalink raw reply [flat|nested] 3+ messages in thread* [dpdk-dev] [PATCH v3 2/2] vhost: Add vhost-user-blk example which support inflight
2019-07-15 20:28 ` [dpdk-dev] [PATCH v3 0/2] support inflight share memory protocol feature in vhost JinYu
2019-07-15 20:28 ` [dpdk-dev] [PATCH v3 1/2] vhost: support inflight share memory protocol feature JinYu
@ 2019-07-15 20:28 ` JinYu
1 sibling, 0 replies; 3+ messages in thread
From: JinYu @ 2019-07-15 20:28 UTC (permalink / raw)
To: dev; +Cc: changpeng.liu, maxime.coquelin, tiwei.bie, zhihong.wang, JinYu
A vhost-user-blk example that support inflight feature. It uses the
new APIs that introduced in the first patch, so It can show how there
APIs work to support inflight feature.
Signed-off-by: JinYu <jin.yu@intel.com>
---
V1 - add the case.
V2 - add the rte_vhost prefix.
---
examples/vhost_blk/Makefile | 67 +++
examples/vhost_blk/blk.c | 117 +++++
examples/vhost_blk/blk_spec.h | 95 +++++
examples/vhost_blk/meson.build | 20 +
examples/vhost_blk/vhost_blk.c | 589 ++++++++++++++++++++++++++
examples/vhost_blk/vhost_blk.h | 96 +++++
examples/vhost_blk/vhost_blk_compat.c | 193 +++++++++
7 files changed, 1177 insertions(+)
create mode 100644 examples/vhost_blk/Makefile
create mode 100644 examples/vhost_blk/blk.c
create mode 100644 examples/vhost_blk/blk_spec.h
create mode 100644 examples/vhost_blk/meson.build
create mode 100644 examples/vhost_blk/vhost_blk.c
create mode 100644 examples/vhost_blk/vhost_blk.h
create mode 100644 examples/vhost_blk/vhost_blk_compat.c
diff --git a/examples/vhost_blk/Makefile b/examples/vhost_blk/Makefile
new file mode 100644
index 000000000..52e9befd8
--- /dev/null
+++ b/examples/vhost_blk/Makefile
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2010-2017 Intel Corporation
+
+# binary name
+APP = vhost-blk
+
+# all source are stored in SRCS-y
+SRCS-y := blk.c vhost_blk.c vhost_blk_compat.c
+
+# Build using pkg-config variables if possible
+$(shell pkg-config --exists libdpdk)
+ifeq ($(.SHELLSTATUS),0)
+
+all: shared
+.PHONY: shared static
+shared: build/$(APP)-shared
+ ln -sf $(APP)-shared build/$(APP)
+static: build/$(APP)-static
+ ln -sf $(APP)-static build/$(APP)
+
+CFLAGS += -D_FILE_OFFSET_BITS=64
+LDFLAGS += -pthread
+
+PC_FILE := $(shell pkg-config --path libdpdk)
+CFLAGS += -O3 $(shell pkg-config --cflags libdpdk)
+LDFLAGS_SHARED = $(shell pkg-config --libs libdpdk)
+LDFLAGS_STATIC = -Wl,-Bstatic $(shell pkg-config --static --libs libdpdk)
+
+build/$(APP)-shared: $(SRCS-y) Makefile $(PC_FILE) | build
+ $(CC) $(CFLAGS) $(SRCS-y) -o $@ $(LDFLAGS) $(LDFLAGS_SHARED)
+
+build/$(APP)-static: $(SRCS-y) Makefile $(PC_FILE) | build
+ $(CC) $(CFLAGS) $(SRCS-y) -o $@ $(LDFLAGS) $(LDFLAGS_STATIC)
+
+build:
+ @mkdir -p $@
+
+.PHONY: clean
+clean:
+ rm -f build/$(APP) build/$(APP)-static build/$(APP)-shared
+ test -d build && rmdir -p build || true
+
+else # Build using legacy build system
+
+ifeq ($(RTE_SDK),)
+$(error "Please define RTE_SDK environment variable")
+endif
+
+# Default target, detect a build directory, by looking for a path with a .config
+RTE_TARGET ?= $(notdir $(abspath $(dir $(firstword $(wildcard $(RTE_SDK)/*/.config)))))
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+ifneq ($(CONFIG_RTE_EXEC_ENV_LINUX),y)
+$(info This application can only operate in a linux environment, \
+please change the definition of the RTE_TARGET environment variable)
+all:
+else
+
+CFLAGS += -D_FILE_OFFSET_BITS=64
+CFLAGS += -O2
+#CFLAGS += $(WERROR_FLAGS)
+
+include $(RTE_SDK)/mk/rte.extapp.mk
+
+endif
+endif
diff --git a/examples/vhost_blk/blk.c b/examples/vhost_blk/blk.c
new file mode 100644
index 000000000..b60550b26
--- /dev/null
+++ b/examples/vhost_blk/blk.c
@@ -0,0 +1,117 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2019 Intel Corporation
+ */
+
+/**
+ * This work is largely based on the "vhost-user-blk" implementation by
+ * SPDK(https://github.com/spdk/spdk).
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <assert.h>
+#include <ctype.h>
+#include <string.h>
+#include <stddef.h>
+
+#include <rte_atomic.h>
+#include <rte_cycles.h>
+#include <rte_log.h>
+#include <rte_malloc.h>
+#include <rte_byteorder.h>
+#include <rte_string_fns.h>
+
+#include "vhost_blk.h"
+#include "blk_spec.h"
+
+static void
+vhost_strcpy_pad(void *dst, const char *src, size_t size, int pad)
+{
+ size_t len;
+
+ len = strlen(src);
+ if (len < size) {
+ memcpy(dst, src, len);
+ memset((char *)dst + len, pad, size - len);
+ } else {
+ memcpy(dst, src, size);
+ }
+}
+
+static int
+vhost_bdev_blk_readwrite(struct vhost_block_dev *bdev,
+ struct vhost_blk_task *task,
+ uint64_t lba_512, __rte_unused uint32_t xfer_len)
+{
+ uint32_t i;
+ uint64_t offset;
+ uint32_t nbytes = 0;
+
+ offset = lba_512 * 512;
+
+ for (i = 0; i < task->iovs_cnt; i++) {
+ if (task->dxfer_dir == BLK_DIR_TO_DEV)
+ memcpy(bdev->data + offset, task->iovs[i].iov_base,
+ task->iovs[i].iov_len);
+ else
+ memcpy(task->iovs[i].iov_base, bdev->data + offset,
+ task->iovs[i].iov_len);
+ offset += task->iovs[i].iov_len;
+ nbytes += task->iovs[i].iov_len;
+ }
+
+ return nbytes;
+}
+
+int
+vhost_bdev_process_blk_commands(struct vhost_block_dev *bdev,
+ struct vhost_blk_task *task)
+{
+ int used_len;
+
+ if (unlikely(task->data_len > (bdev->blockcnt * bdev->blocklen))) {
+ fprintf(stderr, "read or write beyond capacity\n");
+ return VIRTIO_BLK_S_UNSUPP;
+ }
+
+ switch (task->req->type) {
+ case VIRTIO_BLK_T_IN:
+ if (unlikely(task->data_len == 0 || (task->data_len & (512 - 1)) != 0)) {
+ fprintf(stderr,
+ "%s - passed IO buffer is not multiple of 512b (req_idx = %"PRIu16").\n",
+ task->req->type ? "WRITE" : "READ", task->req_idx);
+ return VIRTIO_BLK_S_UNSUPP;
+ }
+
+ task->dxfer_dir = BLK_DIR_FROM_DEV;
+ vhost_bdev_blk_readwrite(bdev, task,
+ task->req->sector, task->data_len);
+ break;
+ case VIRTIO_BLK_T_OUT:
+ if (unlikely(task->data_len == 0 || (task->data_len & (512 - 1)) != 0)) {
+ fprintf(stderr,
+ "%s - passed IO buffer is not multiple of 512b (req_idx = %"PRIu16").\n",
+ task->req->type ? "WRITE" : "READ", task->req_idx);
+ return VIRTIO_BLK_S_UNSUPP;
+ }
+
+ if (task->readtype)
+ return VIRTIO_BLK_S_IOERR;
+ task->dxfer_dir = BLK_DIR_TO_DEV;
+ vhost_bdev_blk_readwrite(bdev, task,
+ task->req->sector, task->data_len);
+ break;
+ case VIRTIO_BLK_T_GET_ID:
+ if (!task->iovs_cnt || task->data_len)
+ return VIRTIO_BLK_S_UNSUPP;
+ used_len = min((size_t)VIRTIO_BLK_ID_BYTES, task->data_len);
+ vhost_strcpy_pad(task->iovs[0].iov_base,
+ bdev->product_name, used_len, ' ');
+ break;
+ default:
+ return VIRTIO_BLK_S_UNSUPP;
+ }
+
+ return VIRTIO_BLK_S_OK;
+}
diff --git a/examples/vhost_blk/blk_spec.h b/examples/vhost_blk/blk_spec.h
new file mode 100644
index 000000000..5875e2f86
--- /dev/null
+++ b/examples/vhost_blk/blk_spec.h
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2019 Intel Corporation
+ */
+
+#ifndef _BLK_SPEC_H
+#define _BLK_SPEC_H
+
+#include <stdint.h>
+
+#ifndef VHOST_USER_MEMORY_MAX_NREGIONS
+#define VHOST_USER_MEMORY_MAX_NREGIONS 8
+#endif
+
+#ifndef VHOST_USER_MAX_CONFIG_SIZE
+#define VHOST_USER_MAX_CONFIG_SIZE 256
+#endif
+
+#ifndef VHOST_USER_PROTOCOL_F_CONFIG
+#define VHOST_USER_PROTOCOL_F_CONFIG 9
+#endif
+
+#ifndef VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD
+#define VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD 12
+#endif
+
+#define VIRTIO_BLK_ID_BYTES 20 /* ID string length */
+
+#define VIRTIO_BLK_T_IN 0
+#define VIRTIO_BLK_T_OUT 1
+#define VIRTIO_BLK_T_FLUSH 4
+#define VIRTIO_BLK_T_GET_ID 8
+#define VIRTIO_BLK_T_DISCARD 11
+#define VIRTIO_BLK_T_WRITE_ZEROES 13
+
+#define VIRTIO_BLK_S_OK 0
+#define VIRTIO_BLK_S_IOERR 1
+#define VIRTIO_BLK_S_UNSUPP 2
+
+enum vhost_user_request {
+ VHOST_USER_NONE = 0,
+ VHOST_USER_GET_FEATURES = 1,
+ VHOST_USER_SET_FEATURES = 2,
+ VHOST_USER_SET_OWNER = 3,
+ VHOST_USER_RESET_OWNER = 4,
+ VHOST_USER_SET_MEM_TABLE = 5,
+ VHOST_USER_SET_LOG_BASE = 6,
+ VHOST_USER_SET_LOG_FD = 7,
+ VHOST_USER_SET_VRING_NUM = 8,
+ VHOST_USER_SET_VRING_ADDR = 9,
+ VHOST_USER_SET_VRING_BASE = 10,
+ VHOST_USER_GET_VRING_BASE = 11,
+ VHOST_USER_SET_VRING_KICK = 12,
+ VHOST_USER_SET_VRING_CALL = 13,
+ VHOST_USER_SET_VRING_ERR = 14,
+ VHOST_USER_GET_PROTOCOL_FEATURES = 15,
+ VHOST_USER_SET_PROTOCOL_FEATURES = 16,
+ VHOST_USER_GET_QUEUE_NUM = 17,
+ VHOST_USER_SET_VRING_ENABLE = 18,
+ VHOST_USER_MAX
+};
+
+/** Get/set config msg payload */
+struct vhost_user_config {
+ uint32_t offset;
+ uint32_t size;
+ uint32_t flags;
+ uint8_t region[VHOST_USER_MAX_CONFIG_SIZE];
+};
+
+/** Fixed-size vhost_memory struct */
+struct vhost_memory_padded {
+ uint32_t nregions;
+ uint32_t padding;
+ struct vhost_memory_region regions[VHOST_USER_MEMORY_MAX_NREGIONS];
+};
+
+struct vhost_user_msg {
+ enum vhost_user_request request;
+
+#define VHOST_USER_VERSION_MASK 0x3
+#define VHOST_USER_REPLY_MASK (0x1 << 2)
+ uint32_t flags;
+ uint32_t size; /**< the following payload size */
+ union {
+#define VHOST_USER_VRING_IDX_MASK 0xff
+#define VHOST_USER_VRING_NOFD_MASK (0x1 << 8)
+ uint64_t u64;
+ struct vhost_vring_state state;
+ struct vhost_vring_addr addr;
+ struct vhost_memory_padded memory;
+ struct vhost_user_config cfg;
+ } payload;
+} __attribute((packed));
+
+#endif
diff --git a/examples/vhost_blk/meson.build b/examples/vhost_blk/meson.build
new file mode 100644
index 000000000..028aa4f62
--- /dev/null
+++ b/examples/vhost_blk/meson.build
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2017 Intel Corporation
+
+# meson file, for building this example as part of a main DPDK build.
+#
+# To build this example as a standalone application with an already-installed
+# DPDK instance, use 'make'
+
+if not is_linux
+ build = false
+endif
+
+if not cc.has_header('linux/virtio_blk.h')
+ build = false
+endif
+
+deps += 'vhost'
+sources = files(
+ 'blk.c', 'vhost_blk.c', 'vhost_blk_compat.c'
+)
diff --git a/examples/vhost_blk/vhost_blk.c b/examples/vhost_blk/vhost_blk.c
new file mode 100644
index 000000000..f1a1f4f03
--- /dev/null
+++ b/examples/vhost_blk/vhost_blk.c
@@ -0,0 +1,589 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2017 Intel Corporation
+ */
+
+#include <stdint.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <signal.h>
+#include <assert.h>
+#include <semaphore.h>
+#include <linux/virtio_blk.h>
+#include <linux/virtio_ring.h>
+
+#include <rte_atomic.h>
+#include <rte_cycles.h>
+#include <rte_log.h>
+#include <rte_malloc.h>
+#include <rte_vhost.h>
+
+#include "vhost_blk.h"
+#include "blk_spec.h"
+
+#define VHOST_BLK_FEATURES ((1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
+ (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \
+ (1ULL << VIRTIO_F_VERSION_1))
+
+/* Path to folder where character device will be created. Can be set by user. */
+static char dev_pathname[PATH_MAX] = "";
+static sem_t exit_sem;
+
+struct vhost_blk_ctrlr *
+vhost_blk_ctrlr_find(const char *ctrlr_name)
+{
+ /* currently we only support 1 socket file fd */
+ return g_vhost_ctrlr;
+}
+
+static uint64_t gpa_to_vva(int vid, uint64_t gpa, uint64_t *len)
+{
+ char path[PATH_MAX];
+ struct vhost_blk_ctrlr *ctrlr;
+ int ret = 0;
+
+ ret = rte_vhost_get_ifname(vid, path, PATH_MAX);
+ if (ret) {
+ fprintf(stderr, "Cannot get socket name\n");
+ assert(ret != 0);
+ }
+
+ ctrlr = vhost_blk_ctrlr_find(path);
+ if (!ctrlr) {
+ fprintf(stderr, "Controller is not ready\n");
+ assert(ctrlr != NULL);
+ }
+
+ assert(ctrlr->mem != NULL);
+
+ return rte_vhost_va_from_guest_pa(ctrlr->mem, gpa, len);
+}
+
+static struct vring_desc *
+descriptor_get_next(struct vring_desc *vq_desc, struct vring_desc *cur_desc)
+{
+ return &vq_desc[cur_desc->next];
+}
+
+static bool
+descriptor_has_next(struct vring_desc *cur_desc)
+{
+ return !!(cur_desc->flags & VRING_DESC_F_NEXT);
+}
+
+static bool
+descriptor_is_wr(struct vring_desc *cur_desc)
+{
+ return !!(cur_desc->flags & VRING_DESC_F_WRITE);
+}
+
+static void
+submit_completion(struct vhost_blk_task *task, uint32_t vid, uint32_t q_idx)
+{
+ struct rte_vhost_vring *vq;
+ struct vring_used *used;
+
+ vq = task->vq;
+ used = vq->used;
+
+ rte_vhost_set_last_inflight_io_split(vid, q_idx, task->req_idx);
+
+ /* Fill out the next entry in the "used" ring. id = the
+ * index of the descriptor that contained the blk request.
+ * len = the total amount of data transferred for the blk
+ * request. We must report the correct len, for variable
+ * length blk CDBs, where we may return less data than
+ * allocated by the guest VM.
+ */
+ used->ring[used->idx & (vq->size - 1)].id = task->req_idx;
+ used->ring[used->idx & (vq->size - 1)].len = task->data_len;
+ used->idx++;
+
+ rte_vhost_clr_inflight_desc_split(vid, q_idx, used->idx, task->req_idx);
+
+ /* Send an interrupt back to the guest VM so that it knows
+ * a completion is ready to be processed.
+ */
+ rte_vhost_vring_call(task->bdev->vid, q_idx);
+}
+
+static void
+vhost_process_payload_chain(struct vhost_blk_task *task)
+{
+ void *data;
+ uint64_t chunck_len;
+
+ task->iovs_cnt = 0;
+
+ do {
+ chunck_len = task->desc->len;
+ data = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
+ task->desc->addr,
+ &chunck_len);
+ if (!data || chunck_len != task->desc->len) {
+ fprintf(stderr, "failed to translate desc address.\n");
+ return;
+ }
+
+ task->iovs[task->iovs_cnt].iov_base = data;
+ task->iovs[task->iovs_cnt].iov_len = task->desc->len;
+ task->data_len += task->desc->len;
+ task->iovs_cnt++;
+ task->desc = descriptor_get_next(task->vq->desc, task->desc);
+ } while (descriptor_has_next(task->desc));
+
+ chunck_len = task->desc->len;
+ task->status = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
+ task->desc->addr,
+ &chunck_len);
+ if (!task->status || chunck_len != task->desc->len)
+ fprintf(stderr, "failed to translate desc address.\n");
+}
+
+static struct vhost_block_dev *
+vhost_blk_bdev_construct(const char *bdev_name, const char *bdev_serial,
+ uint32_t blk_size, uint64_t blk_cnt,
+ bool wce_enable)
+{
+ struct vhost_block_dev *bdev;
+
+ bdev = rte_zmalloc(NULL, sizeof(*bdev), RTE_CACHE_LINE_SIZE);
+ if (!bdev)
+ return NULL;
+
+ strncpy(bdev->name, bdev_name, sizeof(bdev->name));
+ strncpy(bdev->product_name, bdev_serial, sizeof(bdev->product_name));
+ bdev->blocklen = blk_size;
+ bdev->blockcnt = blk_cnt;
+ bdev->write_cache = wce_enable;
+
+ fprintf(stdout, "blocklen=%d, blockcnt=%d\n", bdev->blocklen, bdev->blockcnt);
+
+ /* use memory as disk storage space */
+ bdev->data = rte_zmalloc(NULL, blk_cnt * blk_size, 0);
+ if (!bdev->data) {
+ fprintf(stderr, "no enough reseverd huge memory for disk\n");
+ free(bdev);
+ return NULL;
+ }
+
+ return bdev;
+}
+
+static void
+submit_inflight_vq(struct vhost_blk_ctrlr *ctrlr, uint32_t q_idx)
+{
+ struct vhost_blk_queue *blk_vq;
+ struct rte_vhost_ring_inflight_split *inflight_vq;
+ struct rte_vhost_resubmit_info *resubmit_inflight;
+ struct rte_vhost_resubmit_desc *resubmit_list;
+ int i, req_idx;
+
+ blk_vq = &ctrlr->bdev->queues[q_idx];
+ inflight_vq = &blk_vq->inflight_vq;
+
+ resubmit_inflight = inflight_vq->resubmit_inflight_split;
+ resubmit_list = resubmit_inflight->resubmit_list;
+
+ while (resubmit_list && resubmit_inflight->resubmit_num) {
+ struct vhost_blk_task *task;
+ uint64_t chunck_len;
+ int ret;
+
+ i = (--resubmit_inflight->resubmit_num);
+ req_idx = resubmit_list[i].index;
+
+ task = rte_zmalloc(NULL, sizeof(*task), 0);
+ assert(task != NULL);
+
+ task->ctrlr = ctrlr;
+ task->bdev = ctrlr->bdev;
+ task->vq = &blk_vq->vq;
+ task->req_idx = req_idx;
+ task->desc = &task->vq->desc[task->req_idx];
+
+ /* does not support indirect descriptors */
+ assert((task->desc->flags & VRING_DESC_F_INDIRECT) == 0);
+
+ chunck_len = task->desc->len;
+ task->req = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
+ task->desc->addr,
+ &chunck_len);
+ if (!task->req || chunck_len != task->desc->len) {
+ fprintf(stderr, "failed to translate desc address.\n");
+ rte_free(task);
+ return;
+ }
+
+ task->desc = descriptor_get_next(task->vq->desc, task->desc);
+ if (!descriptor_has_next(task->desc)) {
+ task->dxfer_dir = BLK_DIR_NONE;
+ chunck_len = task->desc->len;
+ task->status = (void *)(uintptr_t)
+ gpa_to_vva(task->bdev->vid,
+ task->desc->addr,
+ &chunck_len);
+ if (!task->status || chunck_len != task->desc->len) {
+ fprintf(stderr, "failed to translate desc address.\n");
+ rte_free(task);
+ return;
+ }
+ } else {
+ task->readtype = descriptor_is_wr(task->desc);
+ vhost_process_payload_chain(task);
+ }
+
+ ret = vhost_bdev_process_blk_commands(ctrlr->bdev, task);
+ if (ret) {
+ /* invalid response */
+ *task->status = VIRTIO_BLK_S_IOERR;
+ } else {
+ /* successfully */
+ *task->status = VIRTIO_BLK_S_OK;
+ }
+ submit_completion(task, ctrlr->bdev->vid, q_idx);
+ rte_free(task);
+ }
+}
+
+static void
+process_requestq(struct vhost_blk_ctrlr *ctrlr, uint32_t q_idx)
+{
+ int ret;
+ struct vhost_blk_queue *blk_vq;
+ struct rte_vhost_vring *vq;
+
+ blk_vq = &ctrlr->bdev->queues[q_idx];
+ vq = &blk_vq->vq;
+
+ while (vq->avail->idx != blk_vq->last_avail_idx) {
+ int req_idx;
+ uint16_t last_idx;
+ struct vhost_blk_task *task;
+ uint64_t chunck_len;
+
+ last_idx = blk_vq->last_avail_idx & (vq->size - 1);
+ req_idx = vq->avail->ring[last_idx];
+
+ task = rte_zmalloc(NULL, sizeof(*task), 0);
+ assert(task != NULL);
+
+ task->ctrlr = ctrlr;
+ task->bdev = ctrlr->bdev;
+ task->vq = vq;
+ task->req_idx = req_idx;
+ task->desc = &task->vq->desc[task->req_idx];
+
+ rte_vhost_set_inflight_desc_split(ctrlr->bdev->vid, q_idx, last_idx);
+
+ /* does not support indirect descriptors */
+ assert((task->desc->flags & VRING_DESC_F_INDIRECT) == 0);
+ blk_vq->last_avail_idx++;
+
+ chunck_len = task->desc->len;
+ task->req = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
+ task->desc->addr,
+ &chunck_len);
+ if (!task->req || chunck_len != task->desc->len) {
+ fprintf(stderr, "failed to translate desc address.\n");
+ rte_free(task);
+ return;
+ }
+
+ task->desc = descriptor_get_next(task->vq->desc, task->desc);
+ if (!descriptor_has_next(task->desc)) {
+ task->dxfer_dir = BLK_DIR_NONE;
+ chunck_len = task->desc->len;
+ task->status = (void *)(uintptr_t)
+ gpa_to_vva(task->bdev->vid,
+ task->desc->addr,
+ &chunck_len);
+ if (!task->status || chunck_len != task->desc->len) {
+ fprintf(stderr, "failed to translate desc address.\n");
+ rte_free(task);
+ return;
+ }
+ } else {
+ task->readtype = descriptor_is_wr(task->desc);
+ vhost_process_payload_chain(task);
+ }
+
+ ret = vhost_bdev_process_blk_commands(ctrlr->bdev, task);
+ if (ret) {
+ /* invalid response */
+ *task->status = VIRTIO_BLK_S_IOERR;
+ } else {
+ /* successfully */
+ *task->status = VIRTIO_BLK_S_OK;
+ }
+
+ submit_completion(task, ctrlr->bdev->vid, q_idx);
+ rte_free(task);
+ }
+}
+
+/* Main framework for processing IOs */
+static void *
+ctrlr_worker(void *arg)
+{
+ struct vhost_blk_ctrlr *ctrlr = (struct vhost_blk_ctrlr *)arg;
+ struct vhost_blk_queue *blk_vq;
+ struct rte_vhost_ring_inflight_split *inflight_vq;
+ struct rte_vhost_resubmit_info *resubmit_inflight;
+ cpu_set_t cpuset;
+ pthread_t thread;
+ int i, ret;
+
+ fprintf(stdout, "Ctrlr Worker Thread start\n");
+
+ if (ctrlr == NULL || ctrlr->bdev == NULL) {
+ fprintf(stderr, "%s: Error, invalid argument passed to worker thread\n",
+ __func__);
+ exit(0);
+ }
+
+ thread = pthread_self();
+ CPU_ZERO(&cpuset);
+ CPU_SET(0, &cpuset);
+ pthread_setaffinity_np(thread, sizeof(cpu_set_t), &cpuset);
+
+ for (i = 0; i < NUM_OF_BLK_QUEUES; i++) {
+ blk_vq = &ctrlr->bdev->queues[i];
+ inflight_vq = &blk_vq->inflight_vq;
+ resubmit_inflight = inflight_vq->resubmit_inflight_split;
+ if (resubmit_inflight && resubmit_inflight->resubmit_num)
+ submit_inflight_vq(ctrlr, i);
+ }
+
+ while (!g_should_stop && ctrlr->bdev != NULL) {
+ for (i = 0; i < NUM_OF_BLK_QUEUES; i++)
+ process_requestq(ctrlr, i);
+ }
+
+ fprintf(stdout, "Ctrlr Worker Thread Exiting\n");
+ sem_post(&exit_sem);
+ return NULL;
+}
+
+static int
+new_device(int vid)
+{
+ char path[PATH_MAX];
+ struct vhost_blk_ctrlr *ctrlr;
+ struct vhost_blk_queue *blk_vq;
+ struct rte_vhost_vring *vq;
+ struct rte_vhost_ring_inflight_split *inflight_vq;
+ pthread_t tid;
+ int i, ret;
+
+ ctrlr = vhost_blk_ctrlr_find(path);
+ if (!ctrlr) {
+ fprintf(stderr, "Controller is not ready\n");
+ return -1;
+ }
+
+ if (ctrlr->started)
+ return 0;
+
+ ctrlr->bdev->vid = vid;
+
+ ret = rte_vhost_get_mem_table(vid, &ctrlr->mem);
+ if (ret)
+ fprintf(stderr, "Get Controller memory region failed\n");
+ assert(ctrlr->mem != NULL);
+
+ /* Disable Notifications and init last idx */
+ for (i = 0; i < NUM_OF_BLK_QUEUES; i++) {
+ rte_vhost_enable_guest_notification(vid, i, 0);
+
+ blk_vq = &ctrlr->bdev->queues[i];
+ vq = &blk_vq->vq;
+ inflight_vq = &blk_vq->inflight_vq;
+ ret = rte_vhost_get_vring_base(ctrlr->bdev->vid, i,
+ &blk_vq->last_avail_idx,
+ &blk_vq->last_used_idx);
+ assert(ret == 0);
+ ret = rte_vhost_get_vhost_vring(ctrlr->bdev->vid, i, vq);
+ assert(ret == 0);
+ ret = rte_vhost_get_vhost_ring_inflight_split(ctrlr->bdev->vid, i,
+ inflight_vq);
+ assert(ret == 0);
+ }
+
+ /* start polling vring */
+ g_should_stop = 0;
+ fprintf(stdout, "New Device %s, Device ID %d\n", path, vid);
+ if (pthread_create(&tid, NULL, &ctrlr_worker, ctrlr) < 0) {
+ fprintf(stderr, "Worker Thread Started Failed\n");
+ return -1;
+ }
+
+ /* device has been started */
+ ctrlr->started = 1;
+ pthread_detach(tid);
+ return 0;
+}
+
+static void
+destroy_device(int vid)
+{
+ char path[PATH_MAX];
+ struct vhost_blk_ctrlr *ctrlr;
+ struct vhost_blk_queue *blk_vq;
+ struct rte_vhost_vring *vq;
+ int i, ret;
+
+ ret = rte_vhost_get_ifname(vid, path, PATH_MAX);
+ if (ret) {
+ fprintf(stderr, "Destroy Ctrlr Failed\n");
+ return;
+ }
+ fprintf(stdout, "Destroy %s Device ID %d\n", path, vid);
+ ctrlr = vhost_blk_ctrlr_find(path);
+ if (!ctrlr) {
+ fprintf(stderr, "Destroy Ctrlr Failed\n");
+ return;
+ }
+
+ if (!ctrlr->started)
+ return;
+
+ g_should_stop = 1;
+
+ for (i = 0; i < NUM_OF_BLK_QUEUES; i++) {
+ blk_vq = &ctrlr->bdev->queues[i];
+ rte_vhost_set_vring_base(ctrlr->bdev->vid, i,
+ blk_vq->last_avail_idx, blk_vq->last_used_idx);
+ }
+
+ free(ctrlr->mem);
+
+ ctrlr->started = 0;
+ sem_wait(&exit_sem);
+}
+
+static int
+new_connection(int vid)
+{
+ /* extend the proper features for block device */
+ vhost_session_install_rte_compat_hooks(vid);
+}
+
+struct vhost_device_ops vhost_blk_device_ops = {
+ .new_device = new_device,
+ .destroy_device = destroy_device,
+ .new_connection = new_connection,
+};
+
+static struct vhost_blk_ctrlr *
+vhost_blk_ctrlr_construct(const char *ctrlr_name)
+{
+ int ret;
+ struct vhost_blk_ctrlr *ctrlr;
+ char *path;
+ char cwd[PATH_MAX];
+
+ /* always use current directory */
+ path = getcwd(cwd, PATH_MAX);
+ if (!path) {
+ fprintf(stderr, "Cannot get current working directory\n");
+ return NULL;
+ }
+ snprintf(dev_pathname, sizeof(dev_pathname), "%s/%s", path, ctrlr_name);
+
+ if (access(dev_pathname, F_OK) != -1) {
+ if (unlink(dev_pathname) != 0)
+ rte_exit(EXIT_FAILURE, "Cannot remove %s.\n",
+ dev_pathname);
+ }
+
+ if (rte_vhost_driver_register(dev_pathname, 0) != 0) {
+ fprintf(stderr, "socket %s already exists\n", dev_pathname);
+ return NULL;
+ }
+
+ ret = rte_vhost_driver_set_features(dev_pathname, VHOST_BLK_FEATURES);
+ if (ret != 0) {
+ fprintf(stderr, "Set vhost driver features failed\n");
+ rte_vhost_driver_unregister(dev_pathname);
+ return NULL;
+ }
+
+ /* set proper features */
+ vhost_dev_install_rte_compat_hooks(dev_pathname);
+
+ ctrlr = rte_zmalloc(NULL, sizeof(*ctrlr), RTE_CACHE_LINE_SIZE);
+ if (!ctrlr) {
+ rte_vhost_driver_unregister(dev_pathname);
+ return NULL;
+ }
+
+ /* hardcoded block device information with 128MiB */
+ ctrlr->bdev = vhost_blk_bdev_construct("malloc0", "vhost_blk_malloc0",
+ 4096, 32768, 0);
+ if (!ctrlr->bdev) {
+ rte_free(ctrlr);
+ rte_vhost_driver_unregister(dev_pathname);
+ return NULL;
+ }
+
+ rte_vhost_driver_callback_register(dev_pathname,
+ &vhost_blk_device_ops);
+
+ return ctrlr;
+}
+
+static void
+signal_handler(__rte_unused int signum)
+{
+ struct vhost_blk_ctrlr *ctrlr;
+
+ if (access(dev_pathname, F_OK) == 0)
+ unlink(dev_pathname);
+
+ g_should_stop = 1;
+
+ ctrlr = vhost_blk_ctrlr_find(NULL);
+ if (ctrlr != NULL) {
+ fprintf(stderr, "never come in\n");
+ if (ctrlr->bdev != NULL) {
+ rte_free(ctrlr->bdev->data);
+ rte_free(ctrlr->bdev);
+ }
+ rte_free(ctrlr);
+ }
+
+ rte_vhost_driver_unregister(dev_pathname);
+ exit(0);
+}
+
+int main(int argc, char *argv[])
+{
+ int ret;
+
+ signal(SIGINT, signal_handler);
+
+ /* init EAL */
+ ret = rte_eal_init(argc, argv);
+ if (ret < 0)
+ rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
+
+ g_vhost_ctrlr = vhost_blk_ctrlr_construct("vhost.socket");
+ if (g_vhost_ctrlr == NULL) {
+ fprintf(stderr, "Construct vhost blk controller failed\n");
+ return 0;
+ }
+
+ if (sem_init(&exit_sem, 0, 0) < 0) {
+ fprintf(stderr, "Error init exit_sem\n");
+ return -1;
+ }
+
+ rte_vhost_driver_start(dev_pathname);
+
+ /* loop for exit the application */
+ while (1)
+ sleep(1);
+
+ return 0;
+}
+
diff --git a/examples/vhost_blk/vhost_blk.h b/examples/vhost_blk/vhost_blk.h
new file mode 100644
index 000000000..95350adba
--- /dev/null
+++ b/examples/vhost_blk/vhost_blk.h
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2017 Intel Corporation
+ */
+
+#ifndef _VHOST_BLK_H_
+#define _VHOST_BLK_H_
+
+#include <stdio.h>
+#include <sys/uio.h>
+#include <stdint.h>
+#include <linux/virtio_blk.h>
+#include <linux/virtio_ring.h>
+
+#include <rte_vhost.h>
+
+struct vhost_blk_queue {
+ struct rte_vhost_vring vq;
+ struct rte_vhost_ring_inflight_split inflight_vq;
+ uint16_t last_avail_idx;
+ uint16_t last_used_idx;
+};
+
+#define NUM_OF_BLK_QUEUES 1
+
+#define min(a, b) (((a) < (b)) ? (a) : (b))
+
+struct vhost_block_dev {
+ /** ID for vhost library. */
+ int vid;
+ /** Queues for the block device */
+ struct vhost_blk_queue queues[NUM_OF_BLK_QUEUES];
+ /** Unique name for this block device. */
+ char name[64];
+
+ /** Unique product name for this kind of block device. */
+ char product_name[256];
+
+ /** Size in bytes of a logical block for the backend */
+ uint32_t blocklen;
+
+ /** Number of blocks */
+ uint64_t blockcnt;
+
+ /** write cache enabled, not used at the moment */
+ int write_cache;
+
+ /** use memory as disk storage space */
+ uint8_t *data;
+};
+
+struct vhost_blk_ctrlr {
+ uint8_t started;
+ uint8_t need_restart;
+ /** Only support 1 LUN for the example */
+ struct vhost_block_dev *bdev;
+ /** VM memory region */
+ struct rte_vhost_memory *mem;
+} __rte_cache_aligned;
+
+#define VHOST_BLK_MAX_IOVS 128
+
+enum blk_data_dir {
+ BLK_DIR_NONE = 0,
+ BLK_DIR_TO_DEV = 1,
+ BLK_DIR_FROM_DEV = 2,
+};
+
+struct vhost_blk_task {
+ uint8_t readtype;
+ int req_idx;
+ uint32_t dxfer_dir;
+ uint32_t data_len;
+ struct virtio_blk_outhdr *req;
+ volatile uint8_t *status;
+ struct iovec iovs[VHOST_BLK_MAX_IOVS];
+ uint32_t iovs_cnt;
+ struct vring_desc *desc;
+ struct rte_vhost_vring *vq;
+ struct vhost_block_dev *bdev;
+ struct vhost_blk_ctrlr *ctrlr;
+};
+
+struct vhost_blk_ctrlr *g_vhost_ctrlr;
+struct vhost_device_ops vhost_blk_device_ops;
+int g_should_stop;
+
+int vhost_bdev_process_blk_commands(struct vhost_block_dev *bdev,
+ struct vhost_blk_task *task);
+
+void vhost_session_install_rte_compat_hooks(uint32_t vid);
+
+void vhost_dev_install_rte_compat_hooks(const char *path);
+
+struct vhost_blk_ctrlr *vhost_blk_ctrlr_find(const char *ctrlr_name);
+
+#endif /* _VHOST_blk_H_ */
diff --git a/examples/vhost_blk/vhost_blk_compat.c b/examples/vhost_blk/vhost_blk_compat.c
new file mode 100644
index 000000000..405b091d7
--- /dev/null
+++ b/examples/vhost_blk/vhost_blk_compat.c
@@ -0,0 +1,193 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2017 Intel Corporation
+ */
+
+#ifndef _VHOST_BLK_COMPAT_H_
+#define _VHOST_BLK_COMPAT_H_
+
+#include <sys/uio.h>
+#include <stdint.h>
+#include <linux/virtio_blk.h>
+#include <linux/virtio_ring.h>
+
+#include <rte_vhost.h>
+#include "vhost_blk.h"
+#include "blk_spec.h"
+
+#define VHOST_MAX_VQUEUES 256
+#define SPDK_VHOST_MAX_VQ_SIZE 1024
+
+#define VHOST_USER_GET_CONFIG 24
+#define VHOST_USER_SET_CONFIG 25
+
+static int
+vhost_blk_get_config(struct vhost_block_dev *bdev, uint8_t *config,
+ uint32_t len)
+{
+ struct virtio_blk_config blkcfg;
+ uint32_t blk_size;
+ uint64_t blkcnt;
+
+ if (bdev == NULL) {
+ /* We can't just return -1 here as this GET_CONFIG message might
+ * be caused by a QEMU VM reboot. Returning -1 will indicate an
+ * error to QEMU, who might then decide to terminate itself.
+ * We don't want that. A simple reboot shouldn't break the system.
+ *
+ * Presenting a block device with block size 0 and block count 0
+ * doesn't cause any problems on QEMU side and the virtio-pci
+ * device is even still available inside the VM, but there will
+ * be no block device created for it - the kernel drivers will
+ * silently reject it.
+ */
+ blk_size = 0;
+ blkcnt = 0;
+ } else {
+ blk_size = bdev->blocklen;
+ blkcnt = bdev->blockcnt;
+ }
+
+ memset(&blkcfg, 0, sizeof(blkcfg));
+ blkcfg.blk_size = blk_size;
+ /* minimum I/O size in blocks */
+ blkcfg.min_io_size = 1;
+ /* expressed in 512 Bytes sectors */
+ blkcfg.capacity = (blkcnt * blk_size) / 512;
+ /* QEMU can overwrite this value when started */
+ blkcfg.num_queues = VHOST_MAX_VQUEUES;
+
+ fprintf(stdout, "block device:blk_size = %d, blkcnt = %d\n", blk_size, blkcnt);
+
+ memcpy(config, &blkcfg, min(len, sizeof(blkcfg)));
+
+ return 0;
+}
+
+static enum rte_vhost_msg_result
+extern_vhost_pre_msg_handler(int vid, void *_msg)
+{
+ char path[PATH_MAX];
+ struct vhost_blk_ctrlr *ctrlr;
+ struct vhost_user_msg *msg = _msg;
+ int ret;
+
+ ret = rte_vhost_get_ifname(vid, path, PATH_MAX);
+ if (ret) {
+ fprintf(stderr, "Cannot get socket name\n");
+ return -1;
+ }
+
+ ctrlr = vhost_blk_ctrlr_find(path);
+ if (!ctrlr) {
+ fprintf(stderr, "Controller is not ready\n");
+ return -1;
+ }
+
+ switch (msg->request) {
+ case VHOST_USER_GET_VRING_BASE:
+ if (!g_should_stop && ctrlr->started)
+ vhost_blk_device_ops.destroy_device(vid);
+ break;
+ case VHOST_USER_SET_VRING_BASE:
+ case VHOST_USER_SET_VRING_ADDR:
+ case VHOST_USER_SET_VRING_NUM:
+ case VHOST_USER_SET_VRING_KICK:
+ if (!g_should_stop && ctrlr->started)
+ vhost_blk_device_ops.destroy_device(vid);
+ break;
+ case VHOST_USER_SET_VRING_CALL:
+ case VHOST_USER_SET_MEM_TABLE:
+ if (!g_should_stop && ctrlr->started) {
+ vhost_blk_device_ops.destroy_device(vid);
+ ctrlr->need_restart = 1;
+ }
+ break;
+ case VHOST_USER_GET_CONFIG: {
+ int rc = 0;
+
+ rc = vhost_blk_get_config(ctrlr->bdev,
+ msg->payload.cfg.region, msg->payload.cfg.size);
+ if (rc != 0)
+ msg->size = 0;
+
+ return RTE_VHOST_MSG_RESULT_REPLY;
+ }
+ case VHOST_USER_SET_CONFIG:
+ default:
+ break;
+ }
+
+ return RTE_VHOST_MSG_RESULT_NOT_HANDLED;
+}
+
+static enum rte_vhost_msg_result
+extern_vhost_post_msg_handler(int vid, void *_msg)
+{
+ char path[PATH_MAX];
+ struct vhost_blk_ctrlr *ctrlr;
+ struct vhost_user_msg *msg = _msg;
+ int ret;
+
+ ret = rte_vhost_get_ifname(vid, path, PATH_MAX);
+ if (ret) {
+ fprintf(stderr, "Cannot get socket name\n");
+ return -1;
+ }
+
+ ctrlr = vhost_blk_ctrlr_find(path);
+ if (!ctrlr) {
+ fprintf(stderr, "Controller is not ready\n");
+ return -1;
+ }
+
+ if (ctrlr->need_restart) {
+ vhost_blk_device_ops.new_device(vid);
+ ctrlr->need_restart = 0;
+ }
+
+ switch (msg->request) {
+ case VHOST_USER_SET_FEATURES:
+ break;
+ case VHOST_USER_SET_VRING_KICK:
+ /* vhost-user spec tells us to start polling a queue after receiving
+ * its SET_VRING_KICK message. Let's do it!
+ */
+ if (g_should_stop && !ctrlr->started)
+ vhost_blk_device_ops.new_device(vid);
+ break;
+ default:
+ break;
+ }
+
+ return RTE_VHOST_MSG_RESULT_NOT_HANDLED;
+}
+
+struct rte_vhost_user_extern_ops g_extern_vhost_ops = {
+ .pre_msg_handle = extern_vhost_pre_msg_handler,
+ .post_msg_handle = extern_vhost_post_msg_handler,
+};
+
+void
+vhost_session_install_rte_compat_hooks(uint32_t vid)
+{
+ int rc;
+
+ rc = rte_vhost_extern_callback_register(vid, &g_extern_vhost_ops, NULL);
+ if (rc != 0)
+ fprintf(stderr,
+ "rte_vhost_extern_callback_register() failed for vid = %d\n",
+ vid);
+}
+
+void
+vhost_dev_install_rte_compat_hooks(const char *path)
+{
+ uint64_t protocol_features = 0;
+
+ rte_vhost_driver_get_protocol_features(path, &protocol_features);
+ protocol_features |= (1ULL << VHOST_USER_PROTOCOL_F_CONFIG);
+ protocol_features |= (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD);
+ rte_vhost_driver_set_protocol_features(path, protocol_features);
+}
+
+#endif
--
2.17.2
^ permalink raw reply [flat|nested] 3+ messages in thread