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35 #include <sys/types.h>
38 #include <rte_malloc.h>
39 #include <rte_kvargs.h>
41 #include "virtio_ethdev.h"
42 #include "virtio_logs.h"
43 #include "virtio_pci.h"
44 #include "virtqueue.h"
45 #include "virtio_rxtx.h"
46 #include "virtio_user/virtio_user_dev.h"
48 #define virtio_user_get_dev(hw) \
49 ((struct virtio_user_dev *)(hw)->virtio_user_dev)
52 virtio_user_read_dev_config(struct virtio_hw *hw, size_t offset,
53 void *dst, int length)
56 struct virtio_user_dev *dev = virtio_user_get_dev(hw);
58 if (offset == offsetof(struct virtio_net_config, mac) &&
59 length == ETHER_ADDR_LEN) {
60 for (i = 0; i < ETHER_ADDR_LEN; ++i)
61 ((uint8_t *)dst)[i] = dev->mac_addr[i];
65 if (offset == offsetof(struct virtio_net_config, status))
66 *(uint16_t *)dst = dev->status;
68 if (offset == offsetof(struct virtio_net_config, max_virtqueue_pairs))
69 *(uint16_t *)dst = dev->max_queue_pairs;
73 virtio_user_write_dev_config(struct virtio_hw *hw, size_t offset,
74 const void *src, int length)
77 struct virtio_user_dev *dev = virtio_user_get_dev(hw);
79 if ((offset == offsetof(struct virtio_net_config, mac)) &&
80 (length == ETHER_ADDR_LEN))
81 for (i = 0; i < ETHER_ADDR_LEN; ++i)
82 dev->mac_addr[i] = ((const uint8_t *)src)[i];
84 PMD_DRV_LOG(ERR, "not supported offset=%zu, len=%d\n",
89 virtio_user_set_status(struct virtio_hw *hw, uint8_t status)
91 struct virtio_user_dev *dev = virtio_user_get_dev(hw);
93 if (status & VIRTIO_CONFIG_STATUS_DRIVER_OK)
94 virtio_user_start_device(dev);
99 virtio_user_reset(struct virtio_hw *hw)
101 struct virtio_user_dev *dev = virtio_user_get_dev(hw);
103 virtio_user_stop_device(dev);
107 virtio_user_get_status(struct virtio_hw *hw)
109 struct virtio_user_dev *dev = virtio_user_get_dev(hw);
115 virtio_user_get_features(struct virtio_hw *hw)
117 struct virtio_user_dev *dev = virtio_user_get_dev(hw);
119 return dev->features;
123 virtio_user_set_features(struct virtio_hw *hw, uint64_t features)
125 struct virtio_user_dev *dev = virtio_user_get_dev(hw);
127 dev->features = features;
131 virtio_user_get_isr(struct virtio_hw *hw __rte_unused)
133 /* When config interrupt happens, driver calls this function to query
134 * what kinds of change happen. Interrupt mode not supported for now.
140 virtio_user_set_config_irq(struct virtio_hw *hw __rte_unused,
141 uint16_t vec __rte_unused)
143 return VIRTIO_MSI_NO_VECTOR;
146 /* This function is to get the queue size, aka, number of descs, of a specified
147 * queue. Different with the VHOST_USER_GET_QUEUE_NUM, which is used to get the
148 * max supported queues.
151 virtio_user_get_queue_num(struct virtio_hw *hw, uint16_t queue_id __rte_unused)
153 struct virtio_user_dev *dev = virtio_user_get_dev(hw);
155 /* Currently, each queue has same queue size */
156 return dev->queue_size;
160 virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
162 struct virtio_user_dev *dev = virtio_user_get_dev(hw);
163 uint16_t queue_idx = vq->vq_queue_index;
164 uint64_t desc_addr, avail_addr, used_addr;
166 desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
167 avail_addr = desc_addr + vq->vq_nentries * sizeof(struct vring_desc);
168 used_addr = RTE_ALIGN_CEIL(avail_addr + offsetof(struct vring_avail,
169 ring[vq->vq_nentries]),
170 VIRTIO_PCI_VRING_ALIGN);
172 dev->vrings[queue_idx].num = vq->vq_nentries;
173 dev->vrings[queue_idx].desc = (void *)(uintptr_t)desc_addr;
174 dev->vrings[queue_idx].avail = (void *)(uintptr_t)avail_addr;
175 dev->vrings[queue_idx].used = (void *)(uintptr_t)used_addr;
181 virtio_user_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
183 /* For legacy devices, write 0 to VIRTIO_PCI_QUEUE_PFN port, QEMU
184 * correspondingly stops the ioeventfds, and reset the status of
186 * For modern devices, set queue desc, avail, used in PCI bar to 0,
187 * not see any more behavior in QEMU.
189 * Here we just care about what information to deliver to vhost-user
190 * or vhost-kernel. So we just close ioeventfd for now.
192 struct virtio_user_dev *dev = virtio_user_get_dev(hw);
194 close(dev->callfds[vq->vq_queue_index]);
195 close(dev->kickfds[vq->vq_queue_index]);
199 virtio_user_notify_queue(struct virtio_hw *hw, struct virtqueue *vq)
202 struct virtio_user_dev *dev = virtio_user_get_dev(hw);
204 if (hw->cvq && (hw->cvq->vq == vq)) {
205 virtio_user_handle_cq(dev, vq->vq_queue_index);
209 if (write(dev->kickfds[vq->vq_queue_index], &buf, sizeof(buf)) < 0)
210 PMD_DRV_LOG(ERR, "failed to kick backend: %s\n",
214 static const struct virtio_pci_ops virtio_user_ops = {
215 .read_dev_cfg = virtio_user_read_dev_config,
216 .write_dev_cfg = virtio_user_write_dev_config,
217 .reset = virtio_user_reset,
218 .get_status = virtio_user_get_status,
219 .set_status = virtio_user_set_status,
220 .get_features = virtio_user_get_features,
221 .set_features = virtio_user_set_features,
222 .get_isr = virtio_user_get_isr,
223 .set_config_irq = virtio_user_set_config_irq,
224 .get_queue_num = virtio_user_get_queue_num,
225 .setup_queue = virtio_user_setup_queue,
226 .del_queue = virtio_user_del_queue,
227 .notify_queue = virtio_user_notify_queue,
230 static const char *valid_args[] = {
231 #define VIRTIO_USER_ARG_QUEUES_NUM "queues"
232 VIRTIO_USER_ARG_QUEUES_NUM,
233 #define VIRTIO_USER_ARG_CQ_NUM "cq"
234 VIRTIO_USER_ARG_CQ_NUM,
235 #define VIRTIO_USER_ARG_MAC "mac"
237 #define VIRTIO_USER_ARG_PATH "path"
238 VIRTIO_USER_ARG_PATH,
239 #define VIRTIO_USER_ARG_QUEUE_SIZE "queue_size"
240 VIRTIO_USER_ARG_QUEUE_SIZE,
244 #define VIRTIO_USER_DEF_CQ_EN 0
245 #define VIRTIO_USER_DEF_Q_NUM 1
246 #define VIRTIO_USER_DEF_Q_SZ 256
249 get_string_arg(const char *key __rte_unused,
250 const char *value, void *extra_args)
252 if (!value || !extra_args)
255 *(char **)extra_args = strdup(value);
261 get_integer_arg(const char *key __rte_unused,
262 const char *value, void *extra_args)
264 if (!value || !extra_args)
267 *(uint64_t *)extra_args = strtoull(value, NULL, 0);
272 static struct rte_eth_dev *
273 virtio_user_eth_dev_alloc(const char *name)
275 struct rte_eth_dev *eth_dev;
276 struct rte_eth_dev_data *data;
277 struct virtio_hw *hw;
278 struct virtio_user_dev *dev;
280 eth_dev = rte_eth_dev_allocate(name, RTE_ETH_DEV_VIRTUAL);
282 PMD_INIT_LOG(ERR, "cannot alloc rte_eth_dev");
286 data = eth_dev->data;
288 hw = rte_zmalloc(NULL, sizeof(*hw), 0);
290 PMD_INIT_LOG(ERR, "malloc virtio_hw failed");
291 rte_eth_dev_release_port(eth_dev);
295 dev = rte_zmalloc(NULL, sizeof(*dev), 0);
297 PMD_INIT_LOG(ERR, "malloc virtio_user_dev failed");
298 rte_eth_dev_release_port(eth_dev);
303 hw->vtpci_ops = &virtio_user_ops;
306 hw->virtio_user_dev = dev;
307 data->dev_private = hw;
308 data->numa_node = SOCKET_ID_ANY;
309 data->kdrv = RTE_KDRV_NONE;
310 data->dev_flags = RTE_ETH_DEV_DETACHABLE;
311 eth_dev->pci_dev = NULL;
312 eth_dev->driver = NULL;
316 /* Dev initialization routine. Invoked once for each virtio vdev at
317 * EAL init time, see rte_eal_dev_init().
318 * Returns 0 on success.
321 virtio_user_pmd_devinit(const char *name, const char *params)
323 struct rte_kvargs *kvlist;
324 struct rte_eth_dev *eth_dev;
325 struct virtio_hw *hw;
326 uint64_t queues = VIRTIO_USER_DEF_Q_NUM;
327 uint64_t cq = VIRTIO_USER_DEF_CQ_EN;
328 uint64_t queue_size = VIRTIO_USER_DEF_Q_SZ;
330 char *mac_addr = NULL;
333 if (!params || params[0] == '\0') {
334 PMD_INIT_LOG(ERR, "arg %s is mandatory for virtio-user",
335 VIRTIO_USER_ARG_QUEUE_SIZE);
339 kvlist = rte_kvargs_parse(params, valid_args);
341 PMD_INIT_LOG(ERR, "error when parsing param");
345 if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PATH) == 1)
346 rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH,
347 &get_string_arg, &path);
349 PMD_INIT_LOG(ERR, "arg %s is mandatory for virtio-user\n",
350 VIRTIO_USER_ARG_QUEUE_SIZE);
354 if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MAC) == 1)
355 rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MAC,
356 &get_string_arg, &mac_addr);
358 if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE) == 1)
359 rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE,
360 &get_integer_arg, &queue_size);
362 if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUES_NUM) == 1)
363 rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUES_NUM,
364 &get_integer_arg, &queues);
366 if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_CQ_NUM) == 1)
367 rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM,
368 &get_integer_arg, &cq);
372 if (queues > 1 && cq == 0) {
373 PMD_INIT_LOG(ERR, "multi-q requires ctrl-q");
377 eth_dev = virtio_user_eth_dev_alloc(name);
379 PMD_INIT_LOG(ERR, "virtio-user fails to alloc device");
383 hw = eth_dev->data->dev_private;
384 if (virtio_user_dev_init(hw->virtio_user_dev, path, queues, cq,
385 queue_size, mac_addr) < 0)
388 /* previously called by rte_eal_pci_probe() for physical dev */
389 if (eth_virtio_dev_init(eth_dev) < 0) {
390 PMD_INIT_LOG(ERR, "eth_virtio_dev_init fails");
403 /** Called by rte_eth_dev_detach() */
405 virtio_user_pmd_devuninit(const char *name)
407 struct rte_eth_dev *eth_dev;
408 struct virtio_hw *hw;
409 struct virtio_user_dev *dev;
414 PMD_DRV_LOG(INFO, "Un-Initializing %s\n", name);
415 eth_dev = rte_eth_dev_allocated(name);
419 /* make sure the device is stopped, queues freed */
420 rte_eth_dev_close(eth_dev->data->port_id);
422 hw = eth_dev->data->dev_private;
423 dev = hw->virtio_user_dev;
424 virtio_user_dev_uninit(dev);
426 rte_free(eth_dev->data->dev_private);
427 rte_free(eth_dev->data);
428 rte_eth_dev_release_port(eth_dev);
433 static struct rte_driver virtio_user_driver = {
434 .name = "virtio-user",
436 .init = virtio_user_pmd_devinit,
437 .uninit = virtio_user_pmd_devuninit,
440 PMD_REGISTER_DRIVER(virtio_user_driver);