diff options
Diffstat (limited to 'drivers/net/virtio/virtio_user/virtio_user_dev.c')
| -rw-r--r-- | drivers/net/virtio/virtio_user/virtio_user_dev.c | 112 |
1 files changed, 70 insertions, 42 deletions
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c index 376c9cf5..e239e0eb 100644 --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c @@ -45,20 +45,14 @@ #include "../virtio_ethdev.h" static int -virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel) +virtio_user_create_queue(struct virtio_user_dev *dev, uint32_t queue_sel) { - int callfd, kickfd; + /* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_CALL come + * firstly because vhost depends on this msg to allocate virtqueue + * pair. + */ + int callfd; 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 */ - }; /* May use invalid flag, but some backend leverages kickfd and callfd as * criteria to judge if dev is alive. so finally we use real event_fd. @@ -68,22 +62,30 @@ virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel) PMD_DRV_LOG(ERR, "callfd error, %s\n", strerror(errno)); return -1; } - kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK); - if (kickfd < 0) { - close(callfd); - PMD_DRV_LOG(ERR, "kickfd error, %s\n", strerror(errno)); - return -1; - } - - /* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_CALL come - * firstly because vhost depends on this msg to allocate virtqueue - * pair. - */ file.index = queue_sel; file.fd = callfd; vhost_user_sock(dev->vhostfd, VHOST_USER_SET_VRING_CALL, &file); dev->callfds[queue_sel] = callfd; + return 0; +} + +static int +virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel) +{ + int kickfd; + 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 */ + }; + state.index = queue_sel; state.num = vring->num; vhost_user_sock(dev->vhostfd, VHOST_USER_SET_VRING_NUM, &state); @@ -97,6 +99,12 @@ virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel) * lastly because vhost depends on this msg to judge if * virtio is ready. */ + kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK); + if (kickfd < 0) { + PMD_DRV_LOG(ERR, "kickfd error, %s\n", strerror(errno)); + return -1; + } + file.index = queue_sel; file.fd = kickfd; vhost_user_sock(dev->vhostfd, VHOST_USER_SET_VRING_KICK, &file); dev->kickfds[queue_sel] = kickfd; @@ -104,37 +112,43 @@ virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel) return 0; } -int -virtio_user_start_device(struct virtio_user_dev *dev) +static int +virtio_user_queue_setup(struct virtio_user_dev *dev, + int (*fn)(struct virtio_user_dev *, uint32_t)) { - uint64_t features; uint32_t i, queue_sel; - int ret; - - /* construct memory region inside each implementation */ - ret = vhost_user_sock(dev->vhostfd, VHOST_USER_SET_MEM_TABLE, NULL); - if (ret < 0) - goto error; for (i = 0; i < dev->max_queue_pairs; ++i) { queue_sel = 2 * i + VTNET_SQ_RQ_QUEUE_IDX; - if (virtio_user_kick_queue(dev, queue_sel) < 0) { - PMD_DRV_LOG(INFO, "kick rx vq fails: %u", i); - goto error; + if (fn(dev, queue_sel) < 0) { + PMD_DRV_LOG(INFO, "setup rx vq fails: %u", i); + return -1; } } for (i = 0; i < dev->max_queue_pairs; ++i) { queue_sel = 2 * i + VTNET_SQ_TQ_QUEUE_IDX; - if (virtio_user_kick_queue(dev, queue_sel) < 0) { - PMD_DRV_LOG(INFO, "kick tx vq fails: %u", i); - goto error; + if (fn(dev, queue_sel) < 0) { + PMD_DRV_LOG(INFO, "setup tx vq fails: %u", i); + return -1; } } - /* After setup all virtqueues, we need to set_features so that these - * features can be set into each virtqueue in vhost side. And before - * that, make sure VHOST_USER_F_PROTOCOL_FEATURES is added if mq is - * enabled, and VIRTIO_NET_F_MAC is stripped. + return 0; +} + +int +virtio_user_start_device(struct virtio_user_dev *dev) +{ + uint64_t features; + int ret; + + /* Step 0: tell vhost to create queues */ + if (virtio_user_queue_setup(dev, virtio_user_create_queue) < 0) + goto error; + + /* Step 1: set features + * Make sure VHOST_USER_F_PROTOCOL_FEATURES is added if mq is enabled, + * and VIRTIO_NET_F_MAC is stripped. */ features = dev->features; if (dev->max_queue_pairs > 1) @@ -145,6 +159,20 @@ virtio_user_start_device(struct virtio_user_dev *dev) goto error; PMD_DRV_LOG(INFO, "set features: %" PRIx64, features); + /* Step 2: share memory regions */ + ret = vhost_user_sock(dev->vhostfd, VHOST_USER_SET_MEM_TABLE, NULL); + if (ret < 0) + goto error; + + /* Step 3: kick queues */ + if (virtio_user_queue_setup(dev, virtio_user_kick_queue) < 0) + goto error; + + /* Step 4: enable queues + * we enable the 1st queue pair by default. + */ + vhost_user_enable_queue_pair(dev->vhostfd, 0, 1); + return 0; error: /* TODO: free resource here or caller to check */ |