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36 #include <sys/socket.h>
38 /* sys/un.h with __USE_MISC uses strlen, which is unsafe */
40 #define REMOVED_USE_MISC
44 /* make sure we redefine __USE_MISC only if it was previously undefined */
45 #ifdef REMOVED_USE_MISC
47 #undef REMOVED_USE_MISC
52 #include <rte_eal_memconfig.h>
53 #include <rte_malloc.h>
55 #include "eal_filesystem.h"
56 #include "eal_pci_init.h"
60 * VFIO socket for communication between primary and secondary processes.
62 * This file is only compiled if CONFIG_RTE_EAL_VFIO is set to "y".
67 #define SOCKET_PATH_FMT "%s/.%s_mp_socket"
68 #define CMSGLEN (CMSG_LEN(sizeof(int)))
69 #define FD_TO_CMSGHDR(fd, chdr) \
71 (chdr).cmsg_len = CMSGLEN;\
72 (chdr).cmsg_level = SOL_SOCKET;\
73 (chdr).cmsg_type = SCM_RIGHTS;\
74 memcpy((chdr).__cmsg_data, &(fd), sizeof(fd));\
76 #define CMSGHDR_TO_FD(chdr, fd) \
77 memcpy(&(fd), (chdr).__cmsg_data, sizeof(fd))
79 static pthread_t socket_thread;
80 static int mp_socket_fd;
83 /* get socket path (/var/run if root, $HOME otherwise) */
85 get_socket_path(char *buffer, int bufsz)
87 const char *dir = "/var/run";
88 const char *home_dir = getenv("HOME");
90 if (getuid() != 0 && home_dir != NULL)
93 /* use current prefix as file path */
94 snprintf(buffer, bufsz, SOCKET_PATH_FMT, dir,
95 internal_config.hugefile_prefix);
101 * data flow for socket comm protocol:
102 * 1. client sends SOCKET_REQ_CONTAINER or SOCKET_REQ_GROUP
103 * 1a. in case of SOCKET_REQ_GROUP, client also then sends group number
104 * 2. server receives message
105 * 2a. in case of invalid group, SOCKET_ERR is sent back to client
106 * 2b. in case of unbound group, SOCKET_NO_FD is sent back to client
107 * 2c. in case of valid group, SOCKET_OK is sent and immediately followed by fd
109 * in case of any error, socket is closed.
112 /* send a request, return -1 on error */
114 vfio_mp_sync_send_request(int socket, int req)
121 memset(&hdr, 0, sizeof(hdr));
127 iov.iov_base = (char *) &buf;
128 iov.iov_len = sizeof(buf);
130 ret = sendmsg(socket, &hdr, 0);
136 /* receive a request and return it */
138 vfio_mp_sync_receive_request(int socket)
145 memset(&hdr, 0, sizeof(hdr));
151 iov.iov_base = (char *) &buf;
152 iov.iov_len = sizeof(buf);
154 ret = recvmsg(socket, &hdr, 0);
163 /* send OK in message, fd in control message */
165 vfio_mp_sync_send_fd(int socket, int fd)
169 struct cmsghdr *chdr;
170 char chdr_buf[CMSGLEN];
174 chdr = (struct cmsghdr *) chdr_buf;
175 memset(chdr, 0, sizeof(chdr_buf));
176 memset(&hdr, 0, sizeof(hdr));
180 iov.iov_base = (char *) &buf;
181 iov.iov_len = sizeof(buf);
182 hdr.msg_control = chdr;
183 hdr.msg_controllen = CMSGLEN;
186 FD_TO_CMSGHDR(fd, *chdr);
188 ret = sendmsg(socket, &hdr, 0);
194 /* receive OK in message, fd in control message */
196 vfio_mp_sync_receive_fd(int socket)
200 struct cmsghdr *chdr;
201 char chdr_buf[CMSGLEN];
207 chdr = (struct cmsghdr *) chdr_buf;
208 memset(chdr, 0, sizeof(chdr_buf));
209 memset(&hdr, 0, sizeof(hdr));
213 iov.iov_base = (char *) &buf;
214 iov.iov_len = sizeof(buf);
215 hdr.msg_control = chdr;
216 hdr.msg_controllen = CMSGLEN;
218 ret = recvmsg(socket, &hdr, 0);
224 if (req != SOCKET_OK)
227 CMSGHDR_TO_FD(*chdr, fd);
232 /* connect socket_fd in secondary process to the primary process's socket */
234 vfio_mp_sync_connect_to_primary(void)
236 struct sockaddr_un addr;
237 socklen_t sockaddr_len;
240 /* set up a socket */
241 socket_fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
243 RTE_LOG(ERR, EAL, "Failed to create socket!\n");
247 get_socket_path(addr.sun_path, sizeof(addr.sun_path));
248 addr.sun_family = AF_UNIX;
250 sockaddr_len = sizeof(struct sockaddr_un);
252 if (connect(socket_fd, (struct sockaddr *) &addr, sockaddr_len) == 0)
255 /* if connect failed */
263 * socket listening thread for primary process
265 static __attribute__((noreturn)) void *
266 pci_vfio_mp_sync_thread(void __rte_unused * arg)
268 int ret, fd, vfio_group_no;
270 /* wait for requests on the socket */
273 struct sockaddr_un addr;
274 socklen_t sockaddr_len = sizeof(addr);
276 /* this is a blocking call */
277 conn_sock = accept(mp_socket_fd, (struct sockaddr *) &addr,
280 /* just restart on error */
284 /* set socket to linger after close */
288 setsockopt(conn_sock, SOL_SOCKET, SO_LINGER, &l, sizeof(l));
290 ret = vfio_mp_sync_receive_request(conn_sock);
293 case SOCKET_REQ_CONTAINER:
294 fd = pci_vfio_get_container_fd();
296 vfio_mp_sync_send_request(conn_sock, SOCKET_ERR);
298 vfio_mp_sync_send_fd(conn_sock, fd);
300 case SOCKET_REQ_GROUP:
301 /* wait for group number */
302 vfio_group_no = vfio_mp_sync_receive_request(conn_sock);
303 if (vfio_group_no < 0) {
308 fd = pci_vfio_get_group_fd(vfio_group_no);
311 vfio_mp_sync_send_request(conn_sock, SOCKET_ERR);
312 /* if VFIO group exists but isn't bound to VFIO driver */
314 vfio_mp_sync_send_request(conn_sock, SOCKET_NO_FD);
315 /* if group exists and is bound to VFIO driver */
317 vfio_mp_sync_send_request(conn_sock, SOCKET_OK);
318 vfio_mp_sync_send_fd(conn_sock, fd);
322 vfio_mp_sync_send_request(conn_sock, SOCKET_ERR);
330 vfio_mp_sync_socket_setup(void)
333 struct sockaddr_un addr;
334 socklen_t sockaddr_len;
336 /* set up a socket */
337 socket_fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
339 RTE_LOG(ERR, EAL, "Failed to create socket!\n");
343 get_socket_path(addr.sun_path, sizeof(addr.sun_path));
344 addr.sun_family = AF_UNIX;
346 sockaddr_len = sizeof(struct sockaddr_un);
348 unlink(addr.sun_path);
350 ret = bind(socket_fd, (struct sockaddr *) &addr, sockaddr_len);
352 RTE_LOG(ERR, EAL, "Failed to bind socket: %s!\n", strerror(errno));
357 ret = listen(socket_fd, 50);
359 RTE_LOG(ERR, EAL, "Failed to listen: %s!\n", strerror(errno));
364 /* save the socket in local configuration */
365 mp_socket_fd = socket_fd;
371 * set up a local socket and tell it to listen for incoming connections
374 pci_vfio_mp_sync_setup(void)
378 if (vfio_mp_sync_socket_setup() < 0) {
379 RTE_LOG(ERR, EAL, "Failed to set up local socket!\n");
383 ret = pthread_create(&socket_thread, NULL,
384 pci_vfio_mp_sync_thread, NULL);
386 RTE_LOG(ERR, EAL, "Failed to create thread for communication with "
387 "secondary processes!\n");