Annotation of qemu/migration-tcp.c, revision 1.1.1.4

1.1       root        1: /*
                      2:  * QEMU live migration
                      3:  *
                      4:  * Copyright IBM, Corp. 2008
                      5:  *
                      6:  * Authors:
                      7:  *  Anthony Liguori   <aliguori@us.ibm.com>
                      8:  *
                      9:  * This work is licensed under the terms of the GNU GPL, version 2.  See
                     10:  * the COPYING file in the top-level directory.
                     11:  *
                     12:  */
                     13: 
                     14: #include "qemu-common.h"
                     15: #include "qemu_socket.h"
                     16: #include "migration.h"
                     17: #include "qemu-char.h"
                     18: #include "sysemu.h"
                     19: #include "buffered_file.h"
                     20: #include "block.h"
                     21: 
                     22: //#define DEBUG_MIGRATION_TCP
                     23: 
                     24: #ifdef DEBUG_MIGRATION_TCP
1.1.1.4 ! root       25: #define DPRINTF(fmt, ...) \
1.1       root       26:     do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
                     27: #else
1.1.1.4 ! root       28: #define DPRINTF(fmt, ...) \
1.1       root       29:     do { } while (0)
                     30: #endif
                     31: 
                     32: static int socket_errno(FdMigrationState *s)
                     33: {
                     34:     return socket_error();
                     35: }
                     36: 
                     37: static int socket_write(FdMigrationState *s, const void * buf, size_t size)
                     38: {
                     39:     return send(s->fd, buf, size, 0);
                     40: }
                     41: 
                     42: static int tcp_close(FdMigrationState *s)
                     43: {
1.1.1.4 ! root       44:     DPRINTF("tcp_close\n");
1.1       root       45:     if (s->fd != -1) {
                     46:         close(s->fd);
                     47:         s->fd = -1;
                     48:     }
                     49:     return 0;
                     50: }
                     51: 
                     52: 
                     53: static void tcp_wait_for_connect(void *opaque)
                     54: {
                     55:     FdMigrationState *s = opaque;
                     56:     int val, ret;
                     57:     socklen_t valsize = sizeof(val);
                     58: 
1.1.1.4 ! root       59:     DPRINTF("connect completed\n");
1.1       root       60:     do {
1.1.1.2   root       61:         ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize);
1.1       root       62:     } while (ret == -1 && (s->get_error(s)) == EINTR);
                     63: 
                     64:     if (ret < 0) {
                     65:         migrate_fd_error(s);
                     66:         return;
                     67:     }
                     68: 
                     69:     qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
                     70: 
                     71:     if (val == 0)
                     72:         migrate_fd_connect(s);
                     73:     else {
1.1.1.4 ! root       74:         DPRINTF("error connecting %d\n", val);
1.1       root       75:         migrate_fd_error(s);
                     76:     }
                     77: }
                     78: 
1.1.1.3   root       79: MigrationState *tcp_start_outgoing_migration(Monitor *mon,
                     80:                                              const char *host_port,
1.1       root       81:                                              int64_t bandwidth_limit,
1.1.1.3   root       82:                                              int detach,
                     83:                                             int blk,
                     84:                                             int inc)
1.1       root       85: {
                     86:     struct sockaddr_in addr;
                     87:     FdMigrationState *s;
                     88:     int ret;
                     89: 
                     90:     if (parse_host_port(&addr, host_port) < 0)
                     91:         return NULL;
                     92: 
                     93:     s = qemu_mallocz(sizeof(*s));
                     94: 
                     95:     s->get_error = socket_errno;
                     96:     s->write = socket_write;
                     97:     s->close = tcp_close;
                     98:     s->mig_state.cancel = migrate_fd_cancel;
                     99:     s->mig_state.get_status = migrate_fd_get_status;
                    100:     s->mig_state.release = migrate_fd_release;
                    101: 
1.1.1.3   root      102:     s->mig_state.blk = blk;
                    103:     s->mig_state.shared = inc;
                    104: 
1.1       root      105:     s->state = MIG_STATE_ACTIVE;
1.1.1.3   root      106:     s->mon = NULL;
1.1       root      107:     s->bandwidth_limit = bandwidth_limit;
1.1.1.3   root      108:     s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
1.1       root      109:     if (s->fd == -1) {
                    110:         qemu_free(s);
                    111:         return NULL;
                    112:     }
                    113: 
                    114:     socket_set_nonblock(s->fd);
                    115: 
1.1.1.3   root      116:     if (!detach) {
                    117:         migrate_fd_monitor_suspend(s, mon);
                    118:     }
1.1       root      119: 
                    120:     do {
                    121:         ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
                    122:         if (ret == -1)
                    123:             ret = -(s->get_error(s));
                    124: 
                    125:         if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
                    126:             qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
                    127:     } while (ret == -EINTR);
                    128: 
                    129:     if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) {
1.1.1.4 ! root      130:         DPRINTF("connect failed\n");
        !           131:         migrate_fd_error(s);
1.1       root      132:     } else if (ret >= 0)
                    133:         migrate_fd_connect(s);
                    134: 
                    135:     return &s->mig_state;
                    136: }
                    137: 
                    138: static void tcp_accept_incoming_migration(void *opaque)
                    139: {
                    140:     struct sockaddr_in addr;
                    141:     socklen_t addrlen = sizeof(addr);
                    142:     int s = (unsigned long)opaque;
                    143:     QEMUFile *f;
1.1.1.4 ! root      144:     int c;
1.1       root      145: 
                    146:     do {
1.1.1.3   root      147:         c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
1.1       root      148:     } while (c == -1 && socket_error() == EINTR);
                    149: 
1.1.1.4 ! root      150:     DPRINTF("accepted migration\n");
1.1       root      151: 
                    152:     if (c == -1) {
                    153:         fprintf(stderr, "could not accept migration connection\n");
1.1.1.4 ! root      154:         goto out2;
1.1       root      155:     }
                    156: 
                    157:     f = qemu_fopen_socket(c);
                    158:     if (f == NULL) {
                    159:         fprintf(stderr, "could not qemu_fopen socket\n");
                    160:         goto out;
                    161:     }
                    162: 
1.1.1.4 ! root      163:     process_incoming_migration(f);
1.1       root      164:     qemu_fclose(f);
                    165: out:
                    166:     close(c);
1.1.1.4 ! root      167: out2:
        !           168:     qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
        !           169:     close(s);
1.1       root      170: }
                    171: 
                    172: int tcp_start_incoming_migration(const char *host_port)
                    173: {
                    174:     struct sockaddr_in addr;
                    175:     int val;
                    176:     int s;
                    177: 
                    178:     if (parse_host_port(&addr, host_port) < 0) {
                    179:         fprintf(stderr, "invalid host/port combination: %s\n", host_port);
                    180:         return -EINVAL;
                    181:     }
                    182: 
1.1.1.3   root      183:     s = qemu_socket(PF_INET, SOCK_STREAM, 0);
1.1       root      184:     if (s == -1)
                    185:         return -socket_error();
                    186: 
                    187:     val = 1;
                    188:     setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
                    189: 
                    190:     if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1)
                    191:         goto err;
                    192: 
                    193:     if (listen(s, 1) == -1)
                    194:         goto err;
                    195: 
                    196:     qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
                    197:                          (void *)(unsigned long)s);
                    198: 
                    199:     return 0;
                    200: 
                    201: err:
                    202:     close(s);
                    203:     return -socket_error();
                    204: }

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