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35 #include <fuse/cuse_lowlevel.h>
36 #include <linux/limits.h>
37 #include <linux/vhost.h>
42 #include <rte_ethdev.h>
44 #include <rte_string_fns.h>
45 #include <rte_virtio_net.h>
47 #include "virtio-net-cdev.h"
48 #include "vhost-net.h"
49 #include "eventfd_copy.h"
51 #define FUSE_OPT_DUMMY "\0\0"
52 #define FUSE_OPT_FORE "-f\0\0"
53 #define FUSE_OPT_NOMULTI "-s\0\0"
55 static const uint32_t default_major = 231;
56 static const uint32_t default_minor = 1;
57 static const char cuse_device_name[] = "/dev/cuse";
58 static const char default_cdev[] = "vhost-net";
60 static struct fuse_session *session;
63 * Returns vhost_cuse_device_ctx from given fuse_req_t. The
64 * index is populated later when the device is added to the
67 static struct vhost_cuse_device_ctx
68 fuse_req_to_vhost_ctx(fuse_req_t req, struct fuse_file_info *fi)
70 struct vhost_cuse_device_ctx ctx;
71 struct fuse_ctx const *const req_ctx = fuse_req_ctx(req);
73 ctx.pid = req_ctx->pid;
74 ctx.vid = (int)fi->fh;
80 * When the device is created in QEMU it gets initialised here and
81 * added to the device linked list.
84 vhost_net_open(fuse_req_t req, struct fuse_file_info *fi)
88 vid = vhost_new_device();
90 fuse_reply_err(req, EPERM);
96 RTE_LOG(INFO, VHOST_CONFIG,
97 "(%d) device configuration started\n", vid);
98 fuse_reply_open(req, fi);
102 * When QEMU is shutdown or killed the device gets released.
105 vhost_net_release(fuse_req_t req, struct fuse_file_info *fi)
108 struct vhost_cuse_device_ctx ctx = fuse_req_to_vhost_ctx(req, fi);
110 vhost_destroy_device(ctx.vid);
111 RTE_LOG(INFO, VHOST_CONFIG, "(%d) device released\n", ctx.vid);
112 fuse_reply_err(req, err);
116 * Boilerplate code for CUSE IOCTL
117 * Implicit arguments: vid, req, result.
119 #define VHOST_IOCTL(func) do { \
120 result = (func)(vid); \
121 fuse_reply_ioctl(req, result, NULL, 0); \
125 * Boilerplate IOCTL RETRY
126 * Implicit arguments: req.
128 #define VHOST_IOCTL_RETRY(size_r, size_w) do { \
129 struct iovec iov_r = { arg, (size_r) }; \
130 struct iovec iov_w = { arg, (size_w) }; \
131 fuse_reply_ioctl_retry(req, &iov_r, \
132 (size_r) ? 1 : 0, &iov_w, (size_w) ? 1 : 0);\
136 * Boilerplate code for CUSE Read IOCTL
137 * Implicit arguments: vid, req, result, in_bufsz, in_buf.
139 #define VHOST_IOCTL_R(type, var, func) do { \
141 VHOST_IOCTL_RETRY(sizeof(type), 0);\
143 (var) = *(const type*)in_buf; \
144 result = func(vid, &(var)); \
145 fuse_reply_ioctl(req, result, NULL, 0);\
150 * Boilerplate code for CUSE Write IOCTL
151 * Implicit arguments: vid, req, result, out_bufsz.
153 #define VHOST_IOCTL_W(type, var, func) do { \
155 VHOST_IOCTL_RETRY(0, sizeof(type));\
157 result = (func)(vid, &(var));\
158 fuse_reply_ioctl(req, result, &(var), sizeof(type));\
163 * Boilerplate code for CUSE Read/Write IOCTL
164 * Implicit arguments: vid, req, result, in_bufsz, in_buf.
166 #define VHOST_IOCTL_RW(type1, var1, type2, var2, func) do { \
168 VHOST_IOCTL_RETRY(sizeof(type1), sizeof(type2));\
170 (var1) = *(const type1*) (in_buf); \
171 result = (func)(vid, (var1), &(var2)); \
172 fuse_reply_ioctl(req, result, &(var2), sizeof(type2));\
177 * The IOCTLs are handled using CUSE/FUSE in userspace. Depending on the type
178 * of IOCTL a buffer is requested to read or to write. This request is handled
179 * by FUSE and the buffer is then given to CUSE.
182 vhost_net_ioctl(fuse_req_t req, int cmd, void *arg,
183 struct fuse_file_info *fi, __rte_unused unsigned flags,
184 const void *in_buf, size_t in_bufsz, size_t out_bufsz)
186 struct vhost_cuse_device_ctx ctx = fuse_req_to_vhost_ctx(req, fi);
187 struct vhost_vring_file file;
188 struct vhost_vring_state state;
189 struct vhost_vring_addr addr;
196 case VHOST_NET_SET_BACKEND:
197 LOG_DEBUG(VHOST_CONFIG,
198 "(%d) IOCTL: VHOST_NET_SET_BACKEND\n", ctx.vid);
200 VHOST_IOCTL_RETRY(sizeof(file), 0);
203 file = *(const struct vhost_vring_file *)in_buf;
204 result = cuse_set_backend(ctx, &file);
205 fuse_reply_ioctl(req, result, NULL, 0);
208 case VHOST_GET_FEATURES:
209 LOG_DEBUG(VHOST_CONFIG,
210 "(%d) IOCTL: VHOST_GET_FEATURES\n", vid);
211 VHOST_IOCTL_W(uint64_t, features, vhost_get_features);
214 case VHOST_SET_FEATURES:
215 LOG_DEBUG(VHOST_CONFIG,
216 "(%d) IOCTL: VHOST_SET_FEATURES\n", vid);
217 VHOST_IOCTL_R(uint64_t, features, vhost_set_features);
220 case VHOST_RESET_OWNER:
221 LOG_DEBUG(VHOST_CONFIG,
222 "(%d) IOCTL: VHOST_RESET_OWNER\n", vid);
223 VHOST_IOCTL(vhost_reset_owner);
226 case VHOST_SET_OWNER:
227 LOG_DEBUG(VHOST_CONFIG,
228 "(%d) IOCTL: VHOST_SET_OWNER\n", vid);
229 VHOST_IOCTL(vhost_set_owner);
232 case VHOST_SET_MEM_TABLE:
233 /*TODO fix race condition.*/
234 LOG_DEBUG(VHOST_CONFIG,
235 "(%d) IOCTL: VHOST_SET_MEM_TABLE\n", vid);
236 static struct vhost_memory mem_temp;
240 VHOST_IOCTL_RETRY(sizeof(struct vhost_memory), 0);
243 case sizeof(struct vhost_memory):
244 mem_temp = *(const struct vhost_memory *) in_buf;
246 if (mem_temp.nregions > 0) {
247 VHOST_IOCTL_RETRY(sizeof(struct vhost_memory) +
248 (sizeof(struct vhost_memory_region) *
249 mem_temp.nregions), 0);
252 fuse_reply_ioctl(req, result, NULL, 0);
257 result = cuse_set_mem_table(ctx, in_buf,
260 fuse_reply_err(req, EINVAL);
262 fuse_reply_ioctl(req, result, NULL, 0);
266 case VHOST_SET_VRING_NUM:
267 LOG_DEBUG(VHOST_CONFIG,
268 "(%d) IOCTL: VHOST_SET_VRING_NUM\n", vid);
269 VHOST_IOCTL_R(struct vhost_vring_state, state,
270 vhost_set_vring_num);
273 case VHOST_SET_VRING_BASE:
274 LOG_DEBUG(VHOST_CONFIG,
275 "(%d) IOCTL: VHOST_SET_VRING_BASE\n", vid);
276 VHOST_IOCTL_R(struct vhost_vring_state, state,
277 vhost_set_vring_base);
280 case VHOST_GET_VRING_BASE:
281 LOG_DEBUG(VHOST_CONFIG,
282 "(%d) IOCTL: VHOST_GET_VRING_BASE\n", vid);
283 VHOST_IOCTL_RW(uint32_t, index,
284 struct vhost_vring_state, state, vhost_get_vring_base);
287 case VHOST_SET_VRING_ADDR:
288 LOG_DEBUG(VHOST_CONFIG,
289 "(%d) IOCTL: VHOST_SET_VRING_ADDR\n", vid);
290 VHOST_IOCTL_R(struct vhost_vring_addr, addr,
291 vhost_set_vring_addr);
294 case VHOST_SET_VRING_KICK:
295 case VHOST_SET_VRING_CALL:
296 if (cmd == VHOST_SET_VRING_KICK)
297 LOG_DEBUG(VHOST_CONFIG,
298 "(%d) IOCTL: VHOST_SET_VRING_KICK\n", vid);
300 LOG_DEBUG(VHOST_CONFIG,
301 "(%d) IOCTL: VHOST_SET_VRING_CALL\n", vid);
303 VHOST_IOCTL_RETRY(sizeof(struct vhost_vring_file), 0);
306 file = *(const struct vhost_vring_file *)in_buf;
307 LOG_DEBUG(VHOST_CONFIG,
308 "idx:%d fd:%d\n", file.index, file.fd);
309 fd = eventfd_copy(file.fd, ctx.pid);
311 fuse_reply_ioctl(req, -1, NULL, 0);
316 if (cmd == VHOST_SET_VRING_KICK) {
317 result = vhost_set_vring_kick(vid, &file);
318 fuse_reply_ioctl(req, result, NULL, 0);
320 result = vhost_set_vring_call(vid, &file);
321 fuse_reply_ioctl(req, result, NULL, 0);
327 RTE_LOG(ERR, VHOST_CONFIG,
328 "(%d) IOCTL: DOESN NOT EXIST\n", vid);
330 fuse_reply_ioctl(req, result, NULL, 0);
334 LOG_DEBUG(VHOST_CONFIG,
335 "(%d) IOCTL: FAIL\n", vid);
337 LOG_DEBUG(VHOST_CONFIG,
338 "(%d) IOCTL: SUCCESS\n", vid);
342 * Structure handling open, release and ioctl function pointers is populated.
344 static const struct cuse_lowlevel_ops vhost_net_ops = {
345 .open = vhost_net_open,
346 .release = vhost_net_release,
347 .ioctl = vhost_net_ioctl,
351 * cuse_info is populated and used to register the cuse device.
352 * vhost_net_device_ops are also passed when the device is registered in app.
355 rte_vhost_driver_register(const char *dev_name, uint64_t flags)
357 struct cuse_info cuse_info;
358 char device_name[PATH_MAX] = "";
359 char char_device_name[PATH_MAX] = "";
360 const char *device_argv[] = { device_name };
362 char fuse_opt_dummy[] = FUSE_OPT_DUMMY;
363 char fuse_opt_fore[] = FUSE_OPT_FORE;
364 char fuse_opt_nomulti[] = FUSE_OPT_NOMULTI;
365 char *fuse_argv[] = {fuse_opt_dummy, fuse_opt_fore, fuse_opt_nomulti};
368 RTE_LOG(ERR, VHOST_CONFIG,
369 "vhost-cuse does not support any flags so far\n");
373 if (access(cuse_device_name, R_OK | W_OK) < 0) {
374 RTE_LOG(ERR, VHOST_CONFIG,
375 "char device %s can't be accessed, maybe not exist\n",
380 if (eventfd_init() < 0)
384 * The device name is created. This is passed to QEMU so that it can
385 * register the device with our application.
387 snprintf(device_name, PATH_MAX, "DEVNAME=%s", dev_name);
388 snprintf(char_device_name, PATH_MAX, "/dev/%s", dev_name);
390 /* Check if device already exists. */
391 if (access(char_device_name, F_OK) != -1) {
392 RTE_LOG(ERR, VHOST_CONFIG,
393 "char device %s already exists\n", char_device_name);
397 memset(&cuse_info, 0, sizeof(cuse_info));
398 cuse_info.dev_major = default_major;
399 cuse_info.dev_minor = default_minor;
400 cuse_info.dev_info_argc = 1;
401 cuse_info.dev_info_argv = device_argv;
402 cuse_info.flags = CUSE_UNRESTRICTED_IOCTL;
404 session = cuse_lowlevel_setup(3, fuse_argv,
405 &cuse_info, &vhost_net_ops, 0, NULL);
413 * An empty function for unregister
416 rte_vhost_driver_unregister(const char *dev_name __rte_unused)
422 * The CUSE session is launched allowing the application to receive open,
423 * release and ioctl calls.
426 rte_vhost_driver_session_start(void)
428 fuse_session_loop(session);