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41 #include <sys/eventfd.h>
44 #include "virtio_user_dev.h"
45 #include "../virtio_ethdev.h"
48 virtio_user_create_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
50 /* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_CALL come
51 * firstly because vhost depends on this msg to allocate virtqueue
55 struct vhost_vring_file file;
57 /* May use invalid flag, but some backend leverages kickfd and callfd as
58 * criteria to judge if dev is alive. so finally we use real event_fd.
60 callfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
62 PMD_DRV_LOG(ERR, "callfd error, %s\n", strerror(errno));
65 file.index = queue_sel;
67 vhost_user_sock(dev->vhostfd, VHOST_USER_SET_VRING_CALL, &file);
68 dev->callfds[queue_sel] = callfd;
74 virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
77 struct vhost_vring_file file;
78 struct vhost_vring_state state;
79 struct vring *vring = &dev->vrings[queue_sel];
80 struct vhost_vring_addr addr = {
82 .desc_user_addr = (uint64_t)(uintptr_t)vring->desc,
83 .avail_user_addr = (uint64_t)(uintptr_t)vring->avail,
84 .used_user_addr = (uint64_t)(uintptr_t)vring->used,
86 .flags = 0, /* disable log */
89 state.index = queue_sel;
90 state.num = vring->num;
91 vhost_user_sock(dev->vhostfd, VHOST_USER_SET_VRING_NUM, &state);
93 state.num = 0; /* no reservation */
94 vhost_user_sock(dev->vhostfd, VHOST_USER_SET_VRING_BASE, &state);
96 vhost_user_sock(dev->vhostfd, VHOST_USER_SET_VRING_ADDR, &addr);
98 /* Of all per virtqueue MSGs, make sure VHOST_USER_SET_VRING_KICK comes
99 * lastly because vhost depends on this msg to judge if
102 kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
104 PMD_DRV_LOG(ERR, "kickfd error, %s\n", strerror(errno));
107 file.index = queue_sel;
109 vhost_user_sock(dev->vhostfd, VHOST_USER_SET_VRING_KICK, &file);
110 dev->kickfds[queue_sel] = kickfd;
116 virtio_user_queue_setup(struct virtio_user_dev *dev,
117 int (*fn)(struct virtio_user_dev *, uint32_t))
119 uint32_t i, queue_sel;
121 for (i = 0; i < dev->max_queue_pairs; ++i) {
122 queue_sel = 2 * i + VTNET_SQ_RQ_QUEUE_IDX;
123 if (fn(dev, queue_sel) < 0) {
124 PMD_DRV_LOG(INFO, "setup rx vq fails: %u", i);
128 for (i = 0; i < dev->max_queue_pairs; ++i) {
129 queue_sel = 2 * i + VTNET_SQ_TQ_QUEUE_IDX;
130 if (fn(dev, queue_sel) < 0) {
131 PMD_DRV_LOG(INFO, "setup tx vq fails: %u", i);
140 virtio_user_start_device(struct virtio_user_dev *dev)
145 /* Do not check return as already done in init, or reset in stop */
146 vhost_user_sock(dev->vhostfd, VHOST_USER_SET_OWNER, NULL);
148 /* Step 0: tell vhost to create queues */
149 if (virtio_user_queue_setup(dev, virtio_user_create_queue) < 0)
152 /* Step 1: set features
153 * Make sure VHOST_USER_F_PROTOCOL_FEATURES is added if mq is enabled,
154 * VIRTIO_NET_F_MAC and VIRTIO_NET_F_CTRL_VQ is stripped.
156 features = dev->features;
157 if (dev->max_queue_pairs > 1)
158 features |= VHOST_USER_MQ;
159 features &= ~(1ull << VIRTIO_NET_F_MAC);
160 features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
161 ret = vhost_user_sock(dev->vhostfd, VHOST_USER_SET_FEATURES, &features);
164 PMD_DRV_LOG(INFO, "set features: %" PRIx64, features);
166 /* Step 2: share memory regions */
167 ret = vhost_user_sock(dev->vhostfd, VHOST_USER_SET_MEM_TABLE, NULL);
171 /* Step 3: kick queues */
172 if (virtio_user_queue_setup(dev, virtio_user_kick_queue) < 0)
175 /* Step 4: enable queues
176 * we enable the 1st queue pair by default.
178 vhost_user_enable_queue_pair(dev->vhostfd, 0, 1);
182 /* TODO: free resource here or caller to check */
186 int virtio_user_stop_device(struct virtio_user_dev *dev)
190 for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
191 close(dev->callfds[i]);
192 close(dev->kickfds[i]);
195 for (i = 0; i < dev->max_queue_pairs; ++i)
196 vhost_user_enable_queue_pair(dev->vhostfd, i, 0);
202 parse_mac(struct virtio_user_dev *dev, const char *mac)
205 uint32_t tmp[ETHER_ADDR_LEN];
210 r = sscanf(mac, "%x:%x:%x:%x:%x:%x", &tmp[0],
211 &tmp[1], &tmp[2], &tmp[3], &tmp[4], &tmp[5]);
212 if (r == ETHER_ADDR_LEN) {
213 for (i = 0; i < ETHER_ADDR_LEN; ++i)
214 dev->mac_addr[i] = (uint8_t)tmp[i];
215 dev->mac_specified = 1;
217 /* ignore the wrong mac, use random mac */
218 PMD_DRV_LOG(ERR, "wrong format of mac: %s", mac);
223 virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
224 int cq, int queue_size, const char *mac)
228 snprintf(dev->path, PATH_MAX, "%s", path);
229 dev->max_queue_pairs = queues;
230 dev->queue_pairs = 1; /* mq disabled by default */
231 dev->queue_size = queue_size;
232 dev->mac_specified = 0;
236 for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; ++i) {
237 dev->kickfds[i] = -1;
238 dev->callfds[i] = -1;
241 dev->vhostfd = vhost_user_setup(dev->path);
242 if (dev->vhostfd < 0) {
243 PMD_INIT_LOG(ERR, "backend set up fails");
247 if (vhost_user_sock(dev->vhostfd, VHOST_USER_SET_OWNER, NULL) < 0) {
248 PMD_INIT_LOG(ERR, "set_owner fails: %s", strerror(errno));
252 if (vhost_user_sock(dev->vhostfd, VHOST_USER_GET_FEATURES,
253 &dev->device_features) < 0) {
254 PMD_INIT_LOG(ERR, "get_features failed: %s", strerror(errno));
257 if (dev->mac_specified)
258 dev->device_features |= (1ull << VIRTIO_NET_F_MAC);
261 /* device does not really need to know anything about CQ,
262 * so if necessary, we just claim to support CQ
264 dev->device_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
266 dev->device_features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
267 /* Also disable features depends on VIRTIO_NET_F_CTRL_VQ */
268 dev->device_features &= ~(1ull << VIRTIO_NET_F_CTRL_RX);
269 dev->device_features &= ~(1ull << VIRTIO_NET_F_CTRL_VLAN);
270 dev->device_features &= ~(1ull << VIRTIO_NET_F_GUEST_ANNOUNCE);
271 dev->device_features &= ~(1ull << VIRTIO_NET_F_MQ);
272 dev->device_features &= ~(1ull << VIRTIO_NET_F_CTRL_MAC_ADDR);
275 if (dev->max_queue_pairs > 1) {
276 if (!(dev->features & VHOST_USER_MQ)) {
277 PMD_INIT_LOG(ERR, "MQ not supported by the backend");
286 virtio_user_dev_uninit(struct virtio_user_dev *dev)
292 virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs)
297 if (q_pairs > dev->max_queue_pairs) {
298 PMD_INIT_LOG(ERR, "multi-q config %u, but only %u supported",
299 q_pairs, dev->max_queue_pairs);
303 for (i = 0; i < q_pairs; ++i)
304 ret |= vhost_user_enable_queue_pair(dev->vhostfd, i, 1);
305 for (i = q_pairs; i < dev->max_queue_pairs; ++i)
306 ret |= vhost_user_enable_queue_pair(dev->vhostfd, i, 0);
308 dev->queue_pairs = q_pairs;
314 virtio_user_handle_ctrl_msg(struct virtio_user_dev *dev, struct vring *vring,
317 struct virtio_net_ctrl_hdr *hdr;
318 virtio_net_ctrl_ack status = ~0;
319 uint16_t i, idx_data, idx_status;
320 uint32_t n_descs = 0;
322 /* locate desc for header, data, and status */
323 idx_data = vring->desc[idx_hdr].next;
327 while (vring->desc[i].flags == VRING_DESC_F_NEXT) {
328 i = vring->desc[i].next;
332 /* locate desc for status */
336 hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr;
337 if (hdr->class == VIRTIO_NET_CTRL_MQ &&
338 hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
341 queues = *(uint16_t *)(uintptr_t)vring->desc[idx_data].addr;
342 status = virtio_user_handle_mq(dev, queues);
346 *(virtio_net_ctrl_ack *)(uintptr_t)vring->desc[idx_status].addr = status;
352 virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx)
354 uint16_t avail_idx, desc_idx;
355 struct vring_used_elem *uep;
357 struct vring *vring = &dev->vrings[queue_idx];
359 /* Consume avail ring, using used ring idx as first one */
360 while (vring->used->idx != vring->avail->idx) {
361 avail_idx = (vring->used->idx) & (vring->num - 1);
362 desc_idx = vring->avail->ring[avail_idx];
364 n_descs = virtio_user_handle_ctrl_msg(dev, vring, desc_idx);
366 /* Update used ring */
367 uep = &vring->used->ring[avail_idx];