diff options
Diffstat (limited to 'src/vcl/vcl_locked.c')
| -rw-r--r-- | src/vcl/vcl_locked.c | 204 |
1 files changed, 133 insertions, 71 deletions
diff --git a/src/vcl/vcl_locked.c b/src/vcl/vcl_locked.c index f3136f9d2ae..5011461596b 100644 --- a/src/vcl/vcl_locked.c +++ b/src/vcl/vcl_locked.c @@ -63,10 +63,19 @@ typedef struct vls_main_ /** Pool of data shared by sessions owned by different workers */ vls_shared_data_t *shared_data_pool; clib_rwlock_t shared_data_lock; + /** Lock to protect rpc among workers */ + clib_spinlock_t worker_rpc_lock; } vls_main_t; vls_main_t *vlsm; +typedef enum +{ + VLS_RPC_STATE_INIT, + VLS_RPC_STATE_SUCCESS, + VLS_RPC_STATE_SESSION_NOT_EXIST, +} vls_rpc_state_e; + typedef enum vls_rpc_msg_type_ { VLS_RPC_CLONE_AND_SHARE, @@ -97,13 +106,11 @@ typedef struct vls_sess_cleanup_msg_ void vls_send_session_cleanup_rpc (vcl_worker_t * wrk, u32 dst_wrk_index, u32 dst_session_index); -void vls_send_clone_and_share_rpc (vcl_worker_t * wrk, - vcl_locked_session_t * vls, +void vls_send_clone_and_share_rpc (vcl_worker_t *wrk, u32 origin_vls_index, u32 session_index, u32 vls_wrk_index, u32 dst_wrk_index, u32 dst_vls_index, u32 dst_session_index); - static inline u32 vls_get_worker_index (void) { @@ -849,12 +856,12 @@ vls_mt_session_should_migrate (vcl_locked_session_t * vls) && vls->worker_index != vcl_get_worker_index ()); } -static void -vls_mt_session_migrate (vcl_locked_session_t * vls) +static vcl_locked_session_t * +vls_mt_session_migrate (vcl_locked_session_t *vls) { u32 wrk_index = vcl_get_worker_index (); vcl_worker_t *wrk; - u32 src_sid, sid; + u32 src_sid, sid, vls_index, own_vcl_wrk_index; vcl_session_t *session; uword *p; @@ -868,7 +875,7 @@ vls_mt_session_migrate (vcl_locked_session_t * vls) { vls->worker_index = wrk_index; vls->session_index = (u32) p[0]; - return; + return vls; } /* @@ -881,40 +888,68 @@ vls_mt_session_migrate (vcl_locked_session_t * vls) { VERR ("session in owner worker(%u) is free", vls->owner_vcl_wrk_index); ASSERT (0); - return; + vls_unlock (vls); + vls_mt_table_runlock (); + return 0; } src_sid = (u32) p[0]; wrk = vcl_worker_get_current (); session = vcl_session_alloc (wrk); sid = session->session_index; - vls_send_clone_and_share_rpc (wrk, vls, sid, vls_get_worker_index (), - vls->owner_vcl_wrk_index, vls->vls_index, - src_sid); - session->session_index = sid; - vls->worker_index = wrk_index; - vls->session_index = sid; - hash_set (vls->vcl_wrk_index_to_session_index, wrk_index, sid); VDBG (1, "migrate session of worker (session): %u (%u) -> %u (%u)", vls->owner_vcl_wrk_index, src_sid, wrk_index, sid); - if (PREDICT_FALSE ((session->flags & VCL_SESSION_F_IS_VEP) - && session->vep.next_sh != ~0)) + /* Drop lock to prevent dead lock when dst wrk trying to get lock. */ + vls_index = vls->vls_index; + own_vcl_wrk_index = vls->owner_vcl_wrk_index; + vls_unlock (vls); + vls_mt_table_runlock (); + vls_send_clone_and_share_rpc (wrk, vls_index, sid, vls_get_worker_index (), + own_vcl_wrk_index, vls_index, src_sid); + + if (PREDICT_FALSE (wrk->rpc_done == VLS_RPC_STATE_SESSION_NOT_EXIST)) + { + VWRN ("session %u not exist", src_sid); + goto err; + } + else if (PREDICT_FALSE (wrk->rpc_done == VLS_RPC_STATE_INIT)) + { + VWRN ("failed to wait rpc response"); + goto err; + } + else if (PREDICT_FALSE ((session->flags & VCL_SESSION_F_IS_VEP) && + session->vep.next_sh != ~0)) { - /* TODO: rollback? */ VERR ("can't migrate nonempty epoll session"); ASSERT (0); - return; + goto err; } else if (PREDICT_FALSE (!(session->flags & VCL_SESSION_F_IS_VEP) && session->session_state != VCL_STATE_CLOSED)) { - /* TODO: rollback? */ VERR ("migrate NOT supported, session_status (%u)", session->session_state); ASSERT (0); - return; + goto err; } + + vls = vls_get_w_dlock (vls_index); + if (PREDICT_FALSE (!vls)) + { + VWRN ("failed to get vls %u", vls_index); + goto err; + } + + session->session_index = sid; + vls->worker_index = wrk_index; + vls->session_index = sid; + hash_set (vls->vcl_wrk_index_to_session_index, wrk_index, sid); + return vls; + +err: + vcl_session_free (wrk, session); + return 0; } static inline void @@ -924,20 +959,24 @@ vls_mt_detect (void) vls_mt_add (); } -#define vls_mt_guard(_vls, _op) \ - int _locks_acq = 0; \ - if (vls_mt_wrk_supported ()) \ - { \ - if (PREDICT_FALSE (_vls \ - && ((vcl_locked_session_t *)_vls)->worker_index != \ - vcl_get_worker_index ())) \ - vls_mt_session_migrate (_vls); \ - } \ - else \ - { \ - if (PREDICT_FALSE (vlsl->vls_mt_n_threads > 1)) \ - vls_mt_acq_locks (_vls, _op, &_locks_acq); \ - } \ +#define vls_mt_guard(_vls, _op) \ + int _locks_acq = 0; \ + if (vls_mt_wrk_supported ()) \ + { \ + if (PREDICT_FALSE (_vls && \ + ((vcl_locked_session_t *) _vls)->worker_index != \ + vcl_get_worker_index ())) \ + { \ + _vls = vls_mt_session_migrate (_vls); \ + if (PREDICT_FALSE (!_vls)) \ + return VPPCOM_EBADFD; \ + } \ + } \ + else \ + { \ + if (PREDICT_FALSE (vlsl->vls_mt_n_threads > 1)) \ + vls_mt_acq_locks (_vls, _op, &_locks_acq); \ + } #define vls_mt_unguard() \ if (PREDICT_FALSE (_locks_acq)) \ @@ -1037,7 +1076,11 @@ vls_attr (vls_handle_t vlsh, uint32_t op, void *buffer, uint32_t * buflen) if (!(vls = vls_get_w_dlock (vlsh))) return VPPCOM_EBADFD; if (vls_mt_session_should_migrate (vls)) - vls_mt_session_migrate (vls); + { + vls = vls_mt_session_migrate (vls); + if (PREDICT_FALSE (!vls)) + return VPPCOM_EBADFD; + } rv = vppcom_session_attr (vls_to_sh_tu (vls), op, buffer, buflen); vls_get_and_unlock (vlsh); return rv; @@ -1162,9 +1205,10 @@ vls_create (uint8_t proto, uint8_t is_nonblocking) { vcl_session_handle_t sh; vls_handle_t vlsh; + vcl_locked_session_t *vls = NULL; vls_mt_detect (); - vls_mt_guard (0, VLS_MT_OP_SPOOL); + vls_mt_guard (vls, VLS_MT_OP_SPOOL); sh = vppcom_session_create (proto, is_nonblocking); vls_mt_unguard (); if (sh == INVALID_SESSION_ID) @@ -1277,12 +1321,16 @@ vls_epoll_ctl (vls_handle_t ep_vlsh, int op, vls_handle_t vlsh, vls_mt_detect (); vls_mt_table_rlock (); ep_vls = vls_get_and_lock (ep_vlsh); - vls = vls_get_and_lock (vlsh); if (vls_mt_session_should_migrate (ep_vls)) - vls_mt_session_migrate (ep_vls); + { + ep_vls = vls_mt_session_migrate (ep_vls); + if (PREDICT_FALSE (!ep_vls)) + return VPPCOM_EBADFD; + } ep_sh = vls_to_sh (ep_vls); + vls = vls_get_and_lock (vlsh); sh = vls_to_sh (vls); if (PREDICT_FALSE (!vlsl->epoll_mp_check)) @@ -1305,13 +1353,13 @@ int vls_epoll_wait (vls_handle_t ep_vlsh, struct epoll_event *events, int maxevents, double wait_for_time) { - vcl_locked_session_t *vls; + vcl_locked_session_t *vls, *vls_tmp = NULL; int rv; vls_mt_detect (); if (!(vls = vls_get_w_dlock (ep_vlsh))) return VPPCOM_EBADFD; - vls_mt_guard (0, VLS_MT_OP_XPOLL); + vls_mt_guard (vls_tmp, VLS_MT_OP_XPOLL); rv = vppcom_epoll_wait (vls_to_sh_tu (vls), events, maxevents, wait_for_time); vls_mt_unguard (); @@ -1356,9 +1404,10 @@ vls_select (int n_bits, vcl_si_set * read_map, vcl_si_set * write_map, vcl_si_set * except_map, double wait_for_time) { int rv; + vcl_locked_session_t *vls = NULL; vls_mt_detect (); - vls_mt_guard (0, VLS_MT_OP_XPOLL); + vls_mt_guard (vls, VLS_MT_OP_XPOLL); if (PREDICT_FALSE (!vlsl->select_mp_check)) vls_select_mp_checks (read_map); rv = vppcom_select (n_bits, read_map, write_map, except_map, wait_for_time); @@ -1560,24 +1609,33 @@ vls_clone_and_share_rpc_handler (void *args) vcl_worker_t *vcl_wrk = vcl_worker_get_current (), *dst_vcl_wrk; vcl_session_t *s, *dst_s; - vls = vls_session_get (wrk, msg->vls_index); - - if (!vls_mt_wrk_supported ()) - vls_init_share_session (wrk, vls); + VDBG (1, "process session clone of worker (session): %u (%u) -> %u (%u)", + vcl_wrk->wrk_index, msg->session_index, msg->origin_vcl_wrk, + msg->origin_session_index); - s = vcl_session_get (vcl_wrk, msg->session_index); - dst_wrk = vls_worker_get (msg->origin_vls_wrk); + /* VCL locked session can't been protected, so DONT touch it. + * VCL session may been free, check it. + */ dst_vcl_wrk = vcl_worker_get (msg->origin_vcl_wrk); - dst_vls = vls_session_get (dst_wrk, msg->origin_vls_index); - dst_vls->shared_data_index = vls->shared_data_index; + s = vcl_session_get (vcl_wrk, msg->session_index); + if (PREDICT_FALSE (!s)) + { + dst_vcl_wrk->rpc_done = VLS_RPC_STATE_SESSION_NOT_EXIST; + return; + } + + if (!vls_mt_wrk_supported ()) + { + vls = vls_session_get (wrk, msg->vls_index); + vls_init_share_session (wrk, vls); + dst_wrk = vls_worker_get (msg->origin_vls_wrk); + dst_vls = vls_session_get (dst_wrk, msg->origin_vls_index); + dst_vls->shared_data_index = vls->shared_data_index; + } dst_s = vcl_session_get (dst_vcl_wrk, msg->origin_session_index); clib_memcpy (dst_s, s, sizeof (*s)); - dst_vcl_wrk->rpc_done = 1; - - VDBG (1, "proces session clone of worker (session): %u (%u) -> %u (%u)", - vcl_wrk->wrk_index, msg->session_index, dst_vcl_wrk->wrk_index, - msg->origin_session_index); + dst_vcl_wrk->rpc_done = VLS_RPC_STATE_SUCCESS; } static void @@ -1585,14 +1643,12 @@ vls_session_cleanup_rpc_handler (void *args) { vls_sess_cleanup_msg_t *msg = (vls_sess_cleanup_msg_t *) args; vcl_worker_t *wrk = vcl_worker_get_current (); - vcl_worker_t *dst_wrk = vcl_worker_get (msg->origin_vcl_wrk); + vcl_session_handle_t sh = vcl_session_handle_from_index (msg->session_index); - vppcom_session_close (vcl_session_handle_from_index (msg->session_index)); + VDBG (1, "process session cleanup of worker (session): %u (%u) from %u ()", + wrk->wrk_index, msg->session_index, msg->origin_vcl_wrk); - dst_wrk->rpc_done = 1; - - VDBG (1, "proces session cleanup of worker (session): %u (%u) from %u ()", - wrk->wrk_index, msg->session_index, dst_wrk->wrk_index); + vppcom_session_close (sh); } static void @@ -1613,34 +1669,42 @@ vls_rpc_handler (void *args) } void -vls_send_clone_and_share_rpc (vcl_worker_t * wrk, - vcl_locked_session_t * vls, u32 session_index, - u32 vls_wrk_index, u32 dst_wrk_index, - u32 dst_vls_index, u32 dst_session_index) +vls_send_clone_and_share_rpc (vcl_worker_t *wrk, u32 origin_vls_index, + u32 session_index, u32 vls_wrk_index, + u32 dst_wrk_index, u32 dst_vls_index, + u32 dst_session_index) { u8 data[sizeof (u8) + sizeof (vls_clone_and_share_msg_t)]; vls_clone_and_share_msg_t *msg; vls_rpc_msg_t *rpc; int ret; + f64 timeout = clib_time_now (&wrk->clib_time) + VLS_WORKER_RPC_TIMEOUT; rpc = (vls_rpc_msg_t *) & data; rpc->type = VLS_RPC_CLONE_AND_SHARE; msg = (vls_clone_and_share_msg_t *) & rpc->data; msg->origin_vls_wrk = vls_wrk_index; - msg->origin_vls_index = vls->vls_index; + msg->origin_vls_index = origin_vls_index; msg->origin_vcl_wrk = wrk->wrk_index; msg->origin_session_index = session_index; msg->vls_index = dst_vls_index; msg->session_index = dst_session_index; - wrk->rpc_done = 0; + /* Try lock and handle rpcs if two threads send each other + * clone requests at the same time. + */ + wrk->rpc_done = VLS_RPC_STATE_INIT; + while (!clib_spinlock_trylock (&vlsm->worker_rpc_lock)) + vcl_flush_mq_events (); ret = vcl_send_worker_rpc (dst_wrk_index, rpc, sizeof (data)); VDBG (1, "send session clone to wrk (session): %u (%u) -> %u (%u), ret=%d", dst_wrk_index, msg->session_index, msg->origin_vcl_wrk, msg->origin_session_index, ret); - while (!ret && !wrk->rpc_done) + while (!ret && wrk->rpc_done == VLS_RPC_STATE_INIT && + clib_time_now (&wrk->clib_time) < timeout) ; + clib_spinlock_unlock (&vlsm->worker_rpc_lock); } void @@ -1658,13 +1722,10 @@ vls_send_session_cleanup_rpc (vcl_worker_t * wrk, msg->origin_vcl_wrk = wrk->wrk_index; msg->session_index = dst_session_index; - wrk->rpc_done = 0; ret = vcl_send_worker_rpc (dst_wrk_index, rpc, sizeof (data)); VDBG (1, "send session cleanup to wrk (session): %u (%u) from %u, ret=%d", dst_wrk_index, msg->session_index, msg->origin_vcl_wrk, ret); - while (!ret && !wrk->rpc_done) - ; } int @@ -1679,6 +1740,7 @@ vls_app_create (char *app_name) clib_memset (vlsm, 0, sizeof (*vlsm)); clib_rwlock_init (&vlsm->vls_table_lock); clib_rwlock_init (&vlsm->shared_data_lock); + clib_spinlock_init (&vlsm->worker_rpc_lock); pool_alloc (vlsm->workers, vcm->cfg.max_workers); pthread_atfork (vls_app_pre_fork, vls_app_fork_parent_handler, |