From: Jin Yu Date: Wed, 9 Oct 2019 20:48:32 +0000 (+0800) Subject: vhost: support inflight info sharing X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=d87f1a1cb7b666550bb53e39c1d85d9f7b861e6f;p=dpdk.git vhost: support inflight info sharing 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. Signed-off-by: Lin Li Signed-off-by: Xun Ni Signed-off-by: Yu Zhang Signed-off-by: Jin Yu Reviewed-by: Maxime Coquelin --- diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h index cfea138d11..4ae47c1e13 100644 --- a/lib/librte_vhost/vhost.h +++ b/lib/librte_vhost/vhost.h @@ -286,6 +286,12 @@ 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 +309,7 @@ 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; diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c index 5ae561e55a..c168c15bc2 100644 --- a/lib/librte_vhost/vhost_user.c +++ b/lib/librte_vhost/vhost_user.c @@ -37,6 +37,10 @@ #ifdef RTE_LIBRTE_VHOST_POSTCOPY #include #endif +#ifdef F_ADD_SEALS /* if file sealing is supported, so is memfd */ +#include +#define MEMFD_SUPPORTED +#endif #include #include @@ -49,6 +53,9 @@ #define VIRTIO_MIN_MTU 68 #define VIRTIO_MAX_MTU 65535 +#define INFLIGHT_ALIGNMENT 64 +#define INFLIGHT_VERSION 0x1 + 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 +85,8 @@ 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 +169,22 @@ vhost_backend_cleanup(struct virtio_net *dev) dev->log_addr = 0; } + if (dev->inflight_info) { + 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; + } + + free(dev->inflight_info); + dev->inflight_info = NULL; + } + if (dev->slave_req_fd >= 0) { close(dev->slave_req_fd); dev->slave_req_fd = -1; @@ -1218,6 +1243,221 @@ virtio_is_ready(struct virtio_net *dev) return 1; } +static 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; +#ifdef MEMFD_SUPPORTED + mfd = memfd_create(name, MFD_CLOEXEC); +#else + RTE_SET_USED(name); +#endif + if (mfd == -1) { + mfd = mkstemp(fname); + if (mfd == -1) { + RTE_LOG(ERR, VHOST_CONFIG, + "failed to get inflight buffer fd\n"); + return NULL; + } + + unlink(fname); + } + + if (ftruncate(mfd, size) == -1) { + RTE_LOG(ERR, VHOST_CONFIG, + "failed to 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, + "failed to mmap inflight buffer\n"); + close(mfd); + return NULL; + } + + *fd = mfd; + return ptr; +} + +static uint32_t +get_pervq_shm_size_split(uint16_t queue_size) +{ + return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_split) * + queue_size + sizeof(uint64_t) + + sizeof(uint16_t) * 4, INFLIGHT_ALIGNMENT); +} + +static uint32_t +get_pervq_shm_size_packed(uint16_t queue_size) +{ + return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_packed) + * queue_size + sizeof(uint64_t) + + sizeof(uint16_t) * 6 + sizeof(uint8_t) * 9, + INFLIGHT_ALIGNMENT); +} + +static int +vhost_user_get_inflight_fd(struct virtio_net **pdev, + VhostUserMsg *msg, + int main_fd __rte_unused) +{ + struct rte_vhost_inflight_info_packed *inflight_packed; + uint64_t pervq_inflight_size, mmap_size; + uint16_t num_queues, queue_size; + struct virtio_net *dev = *pdev; + int fd, i, j; + void *addr; + + if (msg->size != sizeof(msg->payload.inflight)) { + RTE_LOG(ERR, VHOST_CONFIG, + "invalid get_inflight_fd message size is %d\n", + msg->size); + return RTE_VHOST_MSG_RESULT_ERR; + } + + if (dev->inflight_info == NULL) { + dev->inflight_info = calloc(1, + sizeof(struct inflight_mem_info)); + if (!dev->inflight_info) { + RTE_LOG(ERR, VHOST_CONFIG, + "failed to alloc dev inflight area\n"); + 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)) + pervq_inflight_size = get_pervq_shm_size_packed(queue_size); + else + pervq_inflight_size = get_pervq_shm_size_split(queue_size); + + mmap_size = num_queues * pervq_inflight_size; + addr = inflight_mem_alloc("vhost-inflight", mmap_size, &fd); + if (!addr) { + RTE_LOG(ERR, VHOST_CONFIG, + "failed to alloc vhost inflight area\n"); + 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; + + if (vq_is_packed(dev)) { + for (i = 0; i < num_queues; i++) { + inflight_packed = + (struct rte_vhost_inflight_info_packed *)addr; + inflight_packed->used_wrap_counter = 1; + inflight_packed->old_used_wrap_counter = 1; + for (j = 0; j < queue_size; j++) + inflight_packed->desc[j].next = j + 1; + addr = (void *)((char *)addr + pervq_inflight_size); + } + } + + RTE_LOG(INFO, VHOST_CONFIG, + "send inflight mmap_size: %"PRIu64"\n", + msg->payload.inflight.mmap_size); + RTE_LOG(INFO, VHOST_CONFIG, + "send inflight mmap_offset: %"PRIu64"\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) +{ + uint64_t mmap_size, mmap_offset; + uint16_t num_queues, queue_size; + uint32_t pervq_inflight_size; + struct virtio_net *dev = *pdev; + void *addr; + int fd; + + 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)) + pervq_inflight_size = get_pervq_shm_size_packed(queue_size); + else + pervq_inflight_size = get_pervq_shm_size_split(queue_size); + + RTE_LOG(INFO, VHOST_CONFIG, + "set_inflight_fd mmap_size: %"PRIu64"\n", mmap_size); + RTE_LOG(INFO, VHOST_CONFIG, + "set_inflight_fd mmap_offset: %"PRIu64"\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) { + dev->inflight_info = calloc(1, + sizeof(struct inflight_mem_info)); + if (dev->inflight_info == NULL) { + RTE_LOG(ERR, VHOST_CONFIG, + "failed to alloc dev inflight area\n"); + return RTE_VHOST_MSG_RESULT_ERR; + } + } + + 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; + + 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) @@ -1835,9 +2075,10 @@ 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, }; - /* return bytes# of read on success or negative val on failure. */ static int read_vhost_message(int sockfd, struct VhostUserMsg *msg) diff --git a/lib/librte_vhost/vhost_user.h b/lib/librte_vhost/vhost_user.h index 17a1d7bcaf..6563f7315b 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 {