static void citp_fdinfo_do_handover(citp_fdinfo* fdi, int fdt_locked) { int rc; citp_fdinfo* epoll_fdi = NULL; int os_fd = fdi->fd; #ifndef NDEBUG /* Yuk: does for UDP too. */ volatile citp_fdinfo_p* p_fdip; p_fdip = &citp_fdtable.table[fdi->fd].fdip; ci_assert(fdip_is_busy(*p_fdip)); #endif Log_V(ci_log("%s: fd=%d nonb_switch=%d", __FUNCTION__, fdi->fd, fdi->on_rcz.handover_nonb_switch)); if( fdi->epoll_fd >= 0 ) { epoll_fdi = citp_epoll_fdi_from_member(fdi, fdt_locked); if( epoll_fdi->protocol->type == CITP_EPOLLB_FD ) citp_epollb_on_handover(epoll_fdi, fdi); } rc = fdtable_fd_move(fdi->fd, OO_IOC_TCP_HANDOVER); if( rc == -EBUSY && fdi->epoll_fd >= 0 ) { ci_assert(fdi_to_sock_fdi(fdi)->sock.s->b.sb_aflags & CI_SB_AFLAG_MOVED_AWAY); /* If this is our epoll, we can do full handover: we manually add os * fd into the epoll set. * Fixme: ensure we are not in _other_ epoll sets */ ci_bit_clear(&fdi_to_sock_fdi(fdi)->sock.s->b.sb_aflags, CI_SB_AFLAG_MOVED_AWAY_IN_EPOLL_BIT); rc = fdtable_fd_move(fdi->fd, OO_IOC_FILE_MOVED); } if( rc != 0 ) { citp_fdinfo* new_fdi; if( ! fdt_locked ) CITP_FDTABLE_LOCK(); new_fdi = citp_fdtable_probe_locked(fdi->fd, CI_TRUE, CI_TRUE); citp_fdinfo_release_ref(new_fdi, 1); if( ! fdt_locked ) CITP_FDTABLE_UNLOCK(); ci_assert_equal(citp_fdinfo_get_type(new_fdi), CITP_PASSTHROUGH_FD); os_fd = fdi_to_alien_fdi(new_fdi)->os_socket; } if( fdi->on_rcz.handover_nonb_switch >= 0 ) { int on_off = !! fdi->on_rcz.handover_nonb_switch; int rc = ci_sys_ioctl(os_fd, FIONBIO, &on_off); if( rc < 0 ) Log_E(ci_log("%s: ioctl failed on_off=%d", __FUNCTION__, on_off)); } if( rc != 0 ) goto exit; citp_fdtable_busy_clear(fdi->fd, fdip_passthru, fdt_locked); exit: citp_fdinfo_get_ops(fdi)->dtor(fdi, fdt_locked); if( epoll_fdi != NULL && epoll_fdi->protocol->type == CITP_EPOLL_FD ) citp_epoll_on_handover(epoll_fdi, fdi, fdt_locked); if( epoll_fdi != NULL ) citp_fdinfo_release_ref(epoll_fdi, fdt_locked); citp_fdinfo_free(fdi); }
void citp_oo_get_cpu_khz(ci_uint32* cpu_khz) { ef_driver_handle fd; /* set up a constant value for the case everything goes wrong */ *cpu_khz = 1000; if( ef_onload_driver_open(&fd, OO_STACK_DEV, 1) != 0 ) { fprintf(stderr, "%s: Failed to open /dev/onload\n", __FUNCTION__); ci_get_cpu_khz(cpu_khz); return; } if( ci_sys_ioctl(fd, OO_IOC_GET_CPU_KHZ, cpu_khz) != 0 ) { Log_E(log("%s: Failed to query cpu_khz", __FUNCTION__)); ci_get_cpu_khz(cpu_khz); } ef_onload_driver_close(fd); }
int citp_fdtable_ctor() { struct rlimit rlim; int rc; Log_S(log("%s:", __FUNCTION__)); /* How big should our fdtable be by default? It's pretty arbitrary, but we have * seen a few apps that use setrlimit to set the fdtable to 4096 entries on * start-up (see bugs 3253 and 3373), so we choose that. (Note: we can't grow * the table if the app later does setrlimit, and unused entries consume virtual * space only, so it's worth allocating a table of reasonable sized.) */ citp_fdtable.size = 4096; if( getrlimit(RLIMIT_NOFILE, &rlim) == 0 ) { citp_fdtable.size = rlim.rlim_max; if( CITP_OPTS.fdtable_size != 0 && CITP_OPTS.fdtable_size != rlim.rlim_max ) { Log_S(ci_log("Set the limits for the number of opened files " "to EF_FDTABLE_SIZE=%u value.", CITP_OPTS.fdtable_size)); rlim.rlim_max = CITP_OPTS.fdtable_size; if( rlim.rlim_cur > rlim.rlim_max ) rlim.rlim_cur = rlim.rlim_max; if( ci_sys_setrlimit(RLIMIT_NOFILE, &rlim) == 0 ) citp_fdtable.size = rlim.rlim_max; else { /* Most probably, we've got EPERM */ ci_assert_lt(citp_fdtable.size, CITP_OPTS.fdtable_size); ci_log("Can't set EF_FDTABLE_SIZE=%u; using %u", CITP_OPTS.fdtable_size, citp_fdtable.size); rlim.rlim_max = rlim.rlim_cur = citp_fdtable.size; CI_TRY(ci_sys_setrlimit(RLIMIT_NOFILE, &rlim)); } } } else Log_S(ci_log("Assume EF_FDTABLE_SIZE=%u", citp_fdtable.size)); citp_fdtable.inited_count = 0; citp_fdtable.table = ci_libc_malloc(sizeof (citp_fdtable_entry) * citp_fdtable.size); if( ! citp_fdtable.table ) { Log_U(log("%s: failed to allocate fdtable (0x%x)", __FUNCTION__, citp_fdtable.size)); return -1; } /* The whole table is not initialised at start-of-day, but is initialised ** on demand. citp_fdtable.inited_count counts the number of initialised ** entries. */ if( (rc = oo_rwlock_ctor(&citp_ul_lock)) != 0 ) { Log_E(log("%s: oo_rwlock_ctor %d", __FUNCTION__, rc)); return -1; } /* Install SIGONLOAD handler */ { struct sigaction sa; memset(&sa, 0, sizeof(sa)); /* sa_flags and sa_mask = 0 */ sa.sa_handler = sighandler_do_nothing; sigaction(SIGONLOAD, &sa, NULL); } return 0; }
/* Find out what sort of thing [fd] is, and if it is a user-level socket * then map in the user-level state. */ static citp_fdinfo * citp_fdtable_probe_locked(unsigned fd, int print_banner, int fdip_is_already_busy) { citp_fdinfo* fdi = NULL; struct stat64 st; ci_ep_info_t info; if( ! fdip_is_already_busy ) { volatile citp_fdinfo_p* p_fdip; citp_fdinfo_p fdip; /* ?? We're repeating some effort already expended in lookup() here, but ** this keeps it cleaner. May optimise down the line when I understand ** what other code needs to call this. */ p_fdip = &citp_fdtable.table[fd].fdip; again: fdip = *p_fdip; if( fdip_is_busy(fdip) ) fdip = citp_fdtable_busy_wait(fd, 1); if( ! fdip_is_unknown(fdip) && ! fdip_is_normal(fdip) ) goto exit; if( fdip_cas_fail(p_fdip, fdip, fdip_busy) ) goto again; if( fdip_is_normal(fdip) ) { fdi = fdip_to_fdi(fdip); citp_fdinfo_ref(fdi); citp_fdtable_busy_clear(fd, fdip, 1); goto exit; } } if( ci_sys_fstat64(fd, &st) != 0 ) { /* fstat() failed. Must be a bad (closed) file descriptor, so ** leave this entry as unknown. Return citp_the_closed_fd to avoid the ** caller passing through to an fd that is created asynchronously. */ citp_fdtable_busy_clear(fd, fdip_unknown, 1); fdi = &citp_the_closed_fd; citp_fdinfo_ref(fdi); goto exit; } /* oo_get_st_rdev() and oo_onloadfs_dev_t() open-and-close fd, so * fdtable should be locked if strict mode requested. */ if( fdtable_strict() ) { CITP_FDTABLE_ASSERT_LOCKED(1); } if( st.st_dev == oo_onloadfs_dev_t() ) { /* Retrieve user-level endpoint info */ if( oo_ep_info(fd, &info) < 0 ) { Log_V(log("%s: fd=%d type=%d unknown", __FUNCTION__,fd,info.fd_type)); citp_fdtable_busy_clear(fd, fdip_passthru, 1); goto exit; } switch( info.fd_type ) { case CI_PRIV_TYPE_TCP_EP: case CI_PRIV_TYPE_UDP_EP: case CI_PRIV_TYPE_PASSTHROUGH_EP: case CI_PRIV_TYPE_ALIEN_EP: #if CI_CFG_USERSPACE_PIPE case CI_PRIV_TYPE_PIPE_READER: case CI_PRIV_TYPE_PIPE_WRITER: #endif { citp_fdinfo_p fdip; Log_V(log("%s: fd=%d %s restore", __FUNCTION__, fd, info.fd_type == CI_PRIV_TYPE_TCP_EP ? "TCP": #if CI_CFG_USERSPACE_PIPE info.fd_type != CI_PRIV_TYPE_UDP_EP ? "PIPE" : #endif "UDP")); fdip = citp_fdtable_probe_restore(fd, &info, print_banner); if( fdip_is_normal(fdip) ) fdi = fdip_to_fdi(fdip); else citp_fdtable_busy_clear(fd, fdip, 1); goto exit; } case CI_PRIV_TYPE_NETIF: /* This should never happen, because netif fds are close-on-exec. ** But let's leave this code here just in case my reasoning is bad. */ Log_U(log("%s: fd=%d NETIF reserved", __FUNCTION__, fd)); citp_fdtable_busy_clear(fd, fdip_reserved, 1); fdi = &citp_the_reserved_fd; citp_fdinfo_ref(fdi); goto exit; case CI_PRIV_TYPE_NONE: /* This happens if a thread gets at an onload driver fd that has just * been created, but not yet specialised. On Linux I think this * means it will shortly be a new netif internal fd. (fds associated * with sockets and pipes are never unspecialised). */ Log_V(log("%s: fd=%d TYPE_NONE", __FUNCTION__, fd)); citp_fdtable_busy_clear(fd, fdip_passthru, 1); goto exit; default: CI_TEST(0); break; } } else if( ci_major(st.st_rdev) == ci_major(oo_get_st_rdev(OO_EPOLL_DEV)) ) { citp_epollb_fdi *epi = CI_ALLOC_OBJ(citp_epollb_fdi); if( ! epi ) { Log_E(log("%s: out of memory (epoll_fdi)", __FUNCTION__)); citp_fdtable_busy_clear(fd, fdip_passthru, 1); goto exit; } oo_epollb_ctor(epi); fdi = &epi->fdinfo; citp_fdinfo_init(fdi, &citp_epollb_protocol_impl); citp_fdinfo_ref(fdi); citp_fdtable_insert(fdi, fd, 1); goto exit; } #ifndef NDEBUG /* /dev/onload may be netif only; they are closed on fork or exec */ if( ci_major(st.st_rdev) == ci_major(oo_get_st_rdev(OO_STACK_DEV)) ) Log_U(log("%s: %d is /dev/onload", __FUNCTION__, fd)); #endif /* Not one of ours, so pass-through. */ Log_V(log("%s: fd=%u non-efab", __FUNCTION__, fd)); citp_fdtable_busy_clear(fd, fdip_passthru, 1); exit: return fdi; }
static citp_fdinfo_p citp_fdtable_probe_restore(int fd, ci_ep_info_t * info, int print_banner) { citp_protocol_impl* proto = 0; citp_fdinfo* fdi = 0; ci_netif* ni; int rc; int c_sock_fdi = 1; /* Must be holding the FD table writer lock */ CITP_FDTABLE_ASSERT_LOCKED(1); ci_assert_nequal(info->resource_id, CI_ID_POOL_ID_NONE); /* Will need to review this function if the following assert fires */ switch( info->fd_type ) { case CI_PRIV_TYPE_TCP_EP: proto = &citp_tcp_protocol_impl; break; case CI_PRIV_TYPE_UDP_EP: proto = &citp_udp_protocol_impl; break; case CI_PRIV_TYPE_PASSTHROUGH_EP: proto = &citp_passthrough_protocol_impl; c_sock_fdi = 0; break; case CI_PRIV_TYPE_ALIEN_EP: proto = NULL; c_sock_fdi = 0; break; #if CI_CFG_USERSPACE_PIPE case CI_PRIV_TYPE_PIPE_READER: proto = &citp_pipe_read_protocol_impl; c_sock_fdi = 0; break; case CI_PRIV_TYPE_PIPE_WRITER: proto = &citp_pipe_write_protocol_impl; c_sock_fdi = 0; break; #endif default: ci_assert(0); } /* Attempt to find the user-level netif for this endpoint */ ni = citp_find_ul_netif(info->resource_id, 1); if( ! ni ) { ef_driver_handle netif_fd; /* Not found, rebuild/restore the netif for this endpoint */ rc = citp_netif_recreate_probed(fd, &netif_fd, &ni); if ( rc < 0 ) { Log_E(log("%s: citp_netif_recreate_probed failed! (%d)", __FUNCTION__, rc)); goto fail; } if( print_banner ) { ci_log("Importing "ONLOAD_PRODUCT" "ONLOAD_VERSION" "ONLOAD_COPYRIGHT " [%s]", ni->state->pretty_name); } } else citp_netif_add_ref(ni); /* There is a race condition where the fd can have been created, but it has * not yet been initialised, as we can't put a busy marker in the right place * in the fdtable until we know what the fd is. In this case we don't want * to probe this new info, so return the closed fd. */ if( SP_TO_WAITABLE(ni, info->sock_id)->sb_aflags & CI_SB_AFLAG_NOT_READY ) { citp_fdtable_busy_clear(fd, fdip_unknown, 1); fdi = &citp_the_closed_fd; citp_fdinfo_ref(fdi); return fdi_to_fdip(fdi); } if (c_sock_fdi) { citp_sock_fdi* sock_fdi; sock_fdi = CI_ALLOC_OBJ(citp_sock_fdi); if( ! sock_fdi ) { Log_E(log("%s: out of memory (sock_fdi)", __FUNCTION__)); goto fail; } fdi = &sock_fdi->fdinfo; sock_fdi->sock.s = SP_TO_SOCK_CMN(ni, info->sock_id); sock_fdi->sock.netif = ni; } else if( info->fd_type == CI_PRIV_TYPE_PASSTHROUGH_EP ) { citp_waitable* w = SP_TO_WAITABLE(ni, info->sock_id); citp_alien_fdi* alien_fdi; if( ~w->sb_aflags & CI_SB_AFLAG_MOVED_AWAY_IN_EPOLL && fdtable_fd_move(fd, OO_IOC_FILE_MOVED) == 0 ) { citp_netif_release_ref(ni, 1); return fdip_passthru; } alien_fdi = CI_ALLOC_OBJ(citp_alien_fdi); if( ! alien_fdi ) { Log_E(log("%s: out of memory (alien_fdi)", __FUNCTION__)); goto fail; } fdi = &alien_fdi->fdinfo; alien_fdi->netif = ni; alien_fdi->ep = SP_TO_WAITABLE(ni, info->sock_id); citp_passthrough_init(alien_fdi); } else if( info->fd_type == CI_PRIV_TYPE_ALIEN_EP ) { citp_waitable* w = SP_TO_WAITABLE(ni, info->sock_id); citp_sock_fdi* sock_fdi; ci_netif* alien_ni; sock_fdi = CI_ALLOC_OBJ(citp_sock_fdi); if( ! sock_fdi ) { Log_E(log("%s: out of memory (alien sock_fdi)", __FUNCTION__)); goto fail; } fdi = &sock_fdi->fdinfo; rc = citp_netif_by_id(w->moved_to_stack_id, &alien_ni, 1); if( rc != 0 ) { goto fail; } sock_fdi->sock.s = SP_TO_SOCK_CMN(alien_ni, w->moved_to_sock_id); sock_fdi->sock.netif = alien_ni; citp_netif_release_ref(ni, 1); /* Replace the file under this fd if possible */ if( ~w->sb_aflags & CI_SB_AFLAG_MOVED_AWAY_IN_EPOLL ) fdtable_fd_move(fd, OO_IOC_FILE_MOVED); if( sock_fdi->sock.s->b.state & CI_TCP_STATE_TCP ) proto = &citp_tcp_protocol_impl; else if( sock_fdi->sock.s->b.state == CI_TCP_STATE_UDP ) proto = &citp_udp_protocol_impl; else { CI_TEST(0); } } #if CI_CFG_USERSPACE_PIPE else { citp_pipe_fdi* pipe_fdi; pipe_fdi = CI_ALLOC_OBJ(citp_pipe_fdi); if( ! pipe_fdi ) { Log_E(log("%s: out of memory (pipe_fdi)", __FUNCTION__)); goto fail; } fdi = &pipe_fdi->fdinfo; pipe_fdi->pipe = SP_TO_PIPE(ni, info->sock_id); pipe_fdi->ni = ni; } #endif citp_fdinfo_init(fdi, proto); /* We're returning a reference to the caller. */ citp_fdinfo_ref(fdi); citp_fdtable_insert(fdi, fd, 1); return fdi_to_fdip(fdi); fail: if( ni ) citp_netif_release_ref(ni, 1); return fdip_unknown; }
int citp_epoll_create(int size, int flags) { citp_fdinfo *fdi; citp_epoll_fdi *epi; struct citp_epoll_fd* ep; int fd; if( (epi = CI_ALLOC_OBJ(citp_epoll_fdi)) == NULL ) goto fail0; if( (ep = CI_ALLOC_OBJ(struct citp_epoll_fd)) == NULL ) goto fail1; fdi = &epi->fdinfo; citp_fdinfo_init(fdi, &citp_epoll_protocol_impl); /* Create the epoll fd. */ CITP_FDTABLE_LOCK(); if( (fd = ci_sys_epoll_create_compat(size, flags, 0)) < 0 ) goto fail2; citp_fdtable_new_fd_set(fd, fdip_busy, TRUE); /* Init epfd_os */ #ifdef O_CLOEXEC ep->epfd_os = ci_sys_open(OO_EPOLL_DEV, O_RDWR | O_CLOEXEC); #else ep->epfd_os = ci_sys_open(OO_EPOLL_DEV, O_RDWR); if( ep->epfd_os >= 0 ) ci_sys_fcntl(ep->epfd_os, F_SETFD, FD_CLOEXEC); #endif if( ep->epfd_os < 0 ) { Log_E(ci_log("%s: ERROR: failed to open(%s) errno=%d", __FUNCTION__, OO_EPOLL_DEV, errno)); goto fail3; } __citp_fdtable_reserve(ep->epfd_os, 1); ep->shared = mmap(NULL, sizeof(*ep->shared), PROT_READ, MAP_SHARED, ep->epfd_os, 0); if( ep->shared == MAP_FAILED ) { Log_E(ci_log("%s: ERROR: failed to mmap shared segment errno=%d", __FUNCTION__, errno)); goto fail4; } __citp_fdtable_reserve(ep->shared->epfd, 1); CITP_FDTABLE_UNLOCK(); epi->epoll = ep; ep->size = size; oo_wqlock_init(&ep->lock); ep->not_mt_safe = ! CITP_OPTS.ul_epoll_mt_safe; ci_dllist_init(&ep->oo_sockets); ep->oo_sockets_n = 0; ci_dllist_init(&ep->dead_sockets); oo_atomic_set(&ep->refcount, 1); ep->epfd_syncs_needed = 0; ep->blocking = 0; citp_fdtable_insert(fdi, fd, 0); Log_POLL(ci_log("%s: fd=%d driver_fd=%d epfd=%d", __FUNCTION__, fd, ep->epfd_os, (int) ep->shared->epfd)); return fd; fail4: __citp_fdtable_reserve(ep->epfd_os, 0); ci_sys_close(ep->epfd_os); fail3: ci_sys_close(fd); citp_fdtable_busy_clear(fd, fdip_unknown, 1); fail2: CITP_FDTABLE_UNLOCK(); CI_FREE_OBJ(ep); fail1: CI_FREE_OBJ(epi); fail0: return -1; }