/* * Copyright (c) 2017-2019 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef __included_session_h__ #define __included_session_h__ #include <vppinfra/llist.h> #include <vnet/session/session_types.h> #include <vnet/session/session_lookup.h> #include <vnet/session/session_debug.h> #include <svm/message_queue.h> #include <svm/fifo_segment.h> #define foreach_session_input_error \ _(NO_SESSION, "No session drops") \ _(NO_LISTENER, "No listener for dst port drops") \ _(ENQUEUED, "Packets pushed into rx fifo") \ _(NOT_READY, "Session not ready packets") \ _(FIFO_FULL, "Packets dropped for lack of rx fifo space") \ _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space") \ _(API_QUEUE_FULL, "Sessions not created for lack of API queue space") \ typedef enum { #define _(sym,str) SESSION_ERROR_##sym, foreach_session_input_error #undef _ SESSION_N_ERROR, } session_input_error_t; typedef struct session_tx_context_ { CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); session_t *s; transport_proto_vft_t *transport_vft; transport_connection_t *tc; transport_send_params_t sp; u32 max_dequeue; u32 left_to_snd; u32 max_len_to_snd; u16 deq_per_first_buf; u16 deq_per_buf; u16 n_segs_per_evt; u16 n_bufs_needed; u8 n_bufs_per_seg; CLIB_CACHE_LINE_ALIGN_MARK (cacheline1); session_dgram_hdr_t hdr; /** Vector of tx buffer free lists */ u32 *tx_buffers; } session_tx_context_t; typedef struct session_evt_elt { clib_llist_anchor_t evt_list; session_event_t evt; } session_evt_elt_t; typedef struct session_ctrl_evt_data_ { u8 data[SESSION_CTRL_MSG_MAX_SIZE]; } session_evt_ctrl_data_t; typedef enum session_wrk_state_ { SESSION_WRK_POLLING, SESSION_WRK_INTERRUPT, SESSION_WRK_IDLE, } __clib_packed session_wrk_state_t; typedef enum session_wrk_flags_ { SESSION_WRK_F_ADAPTIVE = 1 << 0, } __clib_packed session_wrk_flag_t; typedef struct session_worker_ { CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); /** Worker session pool */ session_t *sessions; /** vpp event message queue for worker */ svm_msg_q_t *vpp_event_queue; /** vlib_time_now last time around the track */ clib_time_type_t last_vlib_time; /** vlib_time_now rounded to us precision and as u64 */ clib_us_time_t last_vlib_us_time; /** Convenience pointer to this worker's vlib_main */ vlib_main_t *vm; /** Per-proto vector of sessions to enqueue */ u32 **session_to_enqueue; /** Timerfd used to periodically signal wrk session queue node */ int timerfd; /** Worker flags */ session_wrk_flag_t flags; /** Worker state */ session_wrk_state_t state; /** Context for session tx */ session_tx_context_t ctx; /** Pool of session event list elements */ session_evt_elt_t *event_elts; /** Pool of ctrl events data buffers */ session_evt_ctrl_data_t *ctrl_evts_data; /** Head of control events list */ clib_llist_index_t ctrl_head; /** Head of list of elements */ clib_llist_index_t new_head; /** Head of list of pending events */ clib_llist_index_t old_head; /** Peekers rw lock */ clib_rwlock_t peekers_rw_locks; /** Vector of buffers to be sent */ u32 *pending_tx_buffers; /** Vector of nexts for the pending tx buffers */ u16 *pending_tx_nexts; /** Clib file for timerfd. Used only if adaptive mode is on */ uword timerfd_file; /** List of pending connects for first worker */ clib_llist_index_t pending_connects; /** Flag that is set if main thread signaled to handle connects */ u32 n_pending_connects; /** Main thread loops in poll mode without a connect */ u32 no_connect_loops; #if SESSION_DEBUG /** last event poll time by thread */ clib_time_type_t last_event_poll; #endif } session_worker_t; typedef int (session_fifo_rx_fn) (session_worker_t * wrk, vlib_node_runtime_t * node, session_evt_elt_t * e, int *n_tx_packets); extern session_fifo_rx_fn session_tx_fifo_peek_and_snd; extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd; extern session_fifo_rx_fn session_tx_fifo_dequeue_internal; u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e); typedef struct session_main_ { /** Worker contexts */ session_worker_t *wrk; /** Event queues memfd segment */ fifo_segment_t evt_qs_segment; /** Unique segment name counter */ u32 unique_segment_name_counter; /** Per transport rx function that can either dequeue or peek */ session_fifo_rx_fn **session_tx_fns; /** Per session type output nodes. Could optimize to group nodes by * fib but lookup would then require session type parsing in session node. * Trade memory for speed, for now */ u32 *session_type_to_next; /** Thread for cl and ho that rely on cl allocs */ u32 transport_cl_thread; transport_proto_t last_transport_proto_type; /* * Config parameters */ /** Session manager is enabled */ u8 is_enabled; /** Session manager initialized (not necessarily enabled) */ u8 is_initialized; /** Enable session manager at startup */ u8 session_enable_asap; /** Poll session node in main thread */ u8 poll_main; /** Allocate private rx mqs for external apps */ u8 use_private_rx_mqs; /** Do not enable session queue node adaptive mode */ u8 no_adaptive; /** vpp fifo event queue configured length */ u32 configured_event_queue_length; /** Session ssvm segment configs*/ uword session_baseva; uword session_va_space_size; uword evt_qs_segment_size; /** Session table size parameters */ u32 configured_v4_session_table_buckets; u32 configured_v4_session_table_memory; u32 configured_v4_halfopen_table_buckets; u32 configured_v4_halfopen_table_memory; u32 configured_v6_session_table_buckets; u32 configured_v6_session_table_memory; u32 configured_v6_halfopen_table_buckets; u32 configured_v6_halfopen_table_memory; /** Transport table (preallocation) size parameters */ u32 local_endpoints_table_memory; u32 local_endpoints_table_buckets; /** Preallocate session config parameter */ u32 preallocated_sessions; } session_main_t; extern session_main_t session_main; extern vlib_node_registration_t session_queue_node; extern vlib_node_registration_t session_queue_process_node; extern vlib_node_registration_t session_queue_pre_input_node; typedef enum session_q_process_evt_ { SESSION_Q_PROCESS_RUN_ON_MAIN = 1, SESSION_Q_PROCESS_STOP } session_q_process_evt_t; #define TRANSPORT_PROTO_INVALID (session_main.last_transport_proto_type + 1) #define TRANSPORT_N_PROTOS (session_main.last_transport_proto_type + 1) static inline void session_evt_add_old (session_worker_t * wrk, session_evt_elt_t * elt) { clib_llist_add_tail (wrk->event_elts, evt_list, elt, clib_llist_elt (wrk->event_elts, wrk->old_head)); } static inline void session_evt_add_head_old (session_worker_t * wrk, session_evt_elt_t * elt) { clib_llist_add (wrk->event_elts, evt_list, elt, clib_llist_elt (wrk->event_elts, wrk->old_head)); } static inline u32 session_evt_ctrl_data_alloc (session_worker_t * wrk) { session_evt_ctrl_data_t *data; pool_get (wrk->ctrl_evts_data, data); return (data - wrk->ctrl_evts_data); } static inline session_evt_elt_t * session_evt_alloc_ctrl (session_worker_t * wrk) { session_evt_elt_t *elt; clib_llist_get (wrk->event_elts, elt); clib_llist_add_tail (wrk->event_elts, evt_list, elt, clib_llist_elt (wrk->event_elts, wrk->ctrl_head)); return elt; } static inline void * session_evt_ctrl_data (session_worker_t * wrk, session_evt_elt_t * elt) { return (void *) (pool_elt_at_index (wrk->ctrl_evts_data, elt->evt.ctrl_data_index)); } static inline void session_evt_ctrl_data_free (session_worker_t * wrk, session_evt_elt_t * elt) { ASSERT (elt->evt.event_type > SESSION_IO_EVT_BUILTIN_TX); pool_put_index (wrk->ctrl_evts_data, elt->evt.ctrl_data_index); } static inline session_evt_elt_t * session_evt_alloc_new (session_worker_t * wrk) { session_evt_elt_t *elt; clib_llist_get (wrk->event_elts, elt); clib_llist_add_tail (wrk->event_elts, evt_list, elt, clib_llist_elt (wrk->event_elts, wrk->new_head)); return elt; } static inline session_evt_elt_t * session_evt_alloc_old (session_worker_t * wrk) { session_evt_elt_t *elt; clib_llist_get (wrk->event_elts, elt); clib_llist_add_tail (wrk->event_elts, evt_list, elt, clib_llist_elt (wrk->event_elts, wrk->old_head)); return elt; } int session_wrk_handle_mq (session_worker_t *wrk, svm_msg_q_t *mq); session_t *session_alloc (u32 thread_index); void session_free (session_t * s); void session_free_w_fifos (session_t * s); void session_cleanup_half_open (session_handle_t ho_handle); u8 session_is_valid (u32 si, u8 thread_index); always_inline session_t * session_get (u32 si, u32 thread_index) { ASSERT (session_is_valid (si, thread_index)); return pool_elt_at_index (session_main.wrk[thread_index].sessions, si); } always_inline session_t * session_get_if_valid (u64 si, u32 thread_index) { if (thread_index >= vec_len (session_main.wrk)) return 0; if (pool_is_free_index (session_main.wrk[thread_index].sessions, si)) return 0; ASSERT (session_is_valid (si, thread_index)); return pool_elt_at_index (session_main.wrk[thread_index].sessions, si); } always_inline session_t * session_get_from_handle (session_handle_t handle) { session_main_t *smm = &session_main; u32 session_index, thread_index; session_parse_handle (handle, &session_index, &thread_index); return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index); } always_inline session_t * session_get_from_handle_if_valid (session_handle_t handle) { u32 session_index, thread_index; session_parse_handle (handle, &session_index, &thread_index); return session_get_if_valid (session_index, thread_index); } u64 session_segment_handle (session_t * s); /** * Acquires a lock that blocks a session pool from expanding. * * This is typically used for safely peeking into other threads' * pools in order to clone elements. Lock should be dropped as soon * as possible by calling @ref session_pool_remove_peeker. * * NOTE: Avoid using pool_elt_at_index while the lock is held because * it may lead to free elt bitmap expansion/contraction! */ always_inline void session_pool_add_peeker (u32 thread_index) { session_worker_t *wrk = &session_main.wrk[thread_index]; if (thread_index == vlib_get_thread_index ()) return; clib_rwlock_reader_lock (&wrk->peekers_rw_locks); } always_inline void session_pool_remove_peeker (u32 thread_index) { session_worker_t *wrk = &session_main.wrk[thread_index]; if (thread_index == vlib_get_thread_index ()) return; clib_rwlock_reader_unlock (&wrk->peekers_rw_locks); } /** * Get session from handle and 'lock' pool resize if not in same thread * * Caller should drop the peek 'lock' as soon as possible. */ always_inline session_t * session_get_from_handle_safe (u64 handle) { u32 thread_index = session_thread_from_handle (handle); session_worker_t *wrk = &session_main.wrk[thread_index]; if (thread_index == vlib_get_thread_index ()) { return pool_elt_at_index (wrk->sessions, session_index_from_handle (handle)); } else { session_pool_add_peeker (thread_index); /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */ return wrk->sessions + session_index_from_handle (handle); } } always_inline u32 session_get_index (session_t * s) { return (s - session_main.wrk[s->thread_index].sessions); } always_inline session_t * session_clone_safe (u32 session_index, u32 thread_index) { session_t *old_s, *new_s; u32 current_thread_index = vlib_get_thread_index (); /* If during the memcpy pool is reallocated AND the memory allocator * decides to give the old chunk of memory to somebody in a hurry to * scribble something on it, we have a problem. So add this thread as * a session pool peeker. */ session_pool_add_peeker (thread_index); new_s = session_alloc (current_thread_index); old_s = session_main.wrk[thread_index].sessions + session_index; clib_memcpy_fast (new_s, old_s, sizeof (*new_s)); session_pool_remove_peeker (thread_index); new_s->thread_index = current_thread_index; new_s->session_index = session_get_index (new_s); return new_s; } int session_open (session_endpoint_cfg_t *sep, session_handle_t *rsh); int session_listen (session_t * s, session_endpoint_cfg_t * sep); int session_stop_listen (session_t * s); void session_half_close (session_t *s); void session_close (session_t * s); void session_reset (session_t * s); void session_transport_half_close (session_t *s); void session_transport_close (session_t * s); void session_transport_reset (session_t * s); void session_transport_cleanup (session_t * s); int session_send_io_evt_to_thread (svm_fifo_t * f, session_evt_type_t evt_type); int session_enqueue_notify (session_t * s); int session_dequeue_notify (session_t * s); int session_send_io_evt_to_thread_custom (void *data, u32 thread_index, session_evt_type_t evt_type); void session_send_rpc_evt_to_thread (u32 thread_index, void *fp, void *rpc_args); void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp, void *rpc_args); void session_add_self_custom_tx_evt (transport_connection_t * tc, u8 has_prio); void sesssion_reschedule_tx (transport_connection_t * tc); transport_connection_t *session_get_transport (session_t * s); void session_get_endpoint (session_t * s, transport_endpoint_t * tep, u8 is_lcl); int session_transport_attribute (session_t *s, u8 is_get, transport_endpt_attr_t *attr); u8 *format_session (u8 * s, va_list * args); uword unformat_session (unformat_input_t * input, va_list * args); uword unformat_transport_connection (unformat_input_t * input, va_list * args); /* * Interface to transport protos */ int session_enqueue_stream_connection (transport_connection_t * tc, vlib_buffer_t * b, u32 offset, u8 queue_event, u8 is_in_order); int session_enqueue_dgram_connection (session_t * s, session_dgram_hdr_t * hdr, vlib_buffer_t * b, u8 proto, u8 queue_event); int session_stream_connect_notify (transport_connection_t * tc, session_error_t err); int session_dgram_connect_notify (transport_connection_t * tc, u32 old_thread_index, session_t ** new_session); int session_stream_accept_notify (transport_connection_t * tc); void session_transport_closing_notify (transport_connection_t * tc); void session_transport_delete_notify (transport_connection_t * tc); void session_half_open_delete_notify (transport_connection_t *tc); void session_half_open_migrate_notify (transport_connection_t *tc); int session_half_open_migrated_notify (transport_connection_t *tc); void session_transport_closed_notify (transport_connection_t * tc); void session_transport_reset_notify (transport_connection_t * tc); int session_stream_accept (transport_connection_t * tc, u32 listener_index, u32 thread_index, u8 notify); int session_dgram_accept (transport_connection_t * tc, u32 listener_index, u32 thread_index); /** * Initialize session layer for given transport proto and ip version * * Allocates per session type (transport proto + ip version) data structures * and adds arc from session queue node to session type output node. * * @param transport_proto transport proto to be registered * @param vft virtual function table for transport * @param is_ip4 flag that indicates if transports uses ipv4 * as underlying network layer * @param output_node output node for transport */ void session_register_transport (transport_proto_t transport_proto, const transport_proto_vft_t * vft, u8 is_ip4, u32 output_node); transport_proto_t session_add_transport_proto (void); int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer, u32 offset, u32 max_bytes); u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes); always_inline u32 transport_max_rx_enqueue (transport_connection_t * tc) { session_t *s = session_get (tc->s_index, tc->thread_index); return svm_fifo_max_enqueue_prod (s->rx_fifo); } always_inline u32 transport_max_tx_dequeue (transport_connection_t * tc) { session_t *s = session_get (tc->s_index, tc->thread_index); return svm_fifo_max_dequeue_cons (s->tx_fifo); } always_inline u32 transport_max_rx_dequeue (transport_connection_t * tc) { session_t *s = session_get (tc->s_index, tc->thread_index); return svm_fifo_max_dequeue (s->rx_fifo); } always_inline u32 transport_rx_fifo_size (transport_connection_t * tc) { session_t *s = session_get (tc->s_index, tc->thread_index); return svm_fifo_size (s->rx_fifo); } always_inline u32 transport_tx_fifo_size (transport_connection_t * tc) { session_t *s = session_get (tc->s_index, tc->thread_index); return svm_fifo_size (s->tx_fifo); } always_inline u8 transport_rx_fifo_has_ooo_data (transport_connection_t * tc) { session_t *s = session_get (tc->c_index, tc->thread_index); return svm_fifo_has_ooo_data (s->rx_fifo); } always_inline void transport_rx_fifo_req_deq_ntf (transport_connection_t *tc) { session_t *s = session_get (tc->s_index, tc->thread_index); svm_fifo_add_want_deq_ntf (s->rx_fifo, SVM_FIFO_WANT_DEQ_NOTIF); } always_inline clib_time_type_t transport_time_now (u32 thread_index) { return session_main.wrk[thread_index].last_vlib_time; } always_inline clib_us_time_t transport_us_time_now (u32 thread_index) { return session_main.wrk[thread_index].last_vlib_us_time; } always_inline clib_time_type_t transport_seconds_per_loop (u32 thread_index) { return session_main.wrk[thread_index].vm->seconds_per_loop; } always_inline void transport_add_tx_event (transport_connection_t * tc) { session_t *s = session_get (tc->s_index, tc->thread_index); if (svm_fifo_has_event (s->tx_fifo)) return; session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX); } always_inline u32 transport_cl_thread (void) { return session_main.transport_cl_thread; } /* * Listen sessions */ always_inline u64 listen_session_get_handle (session_t * s) { ASSERT (s->session_state == SESSION_STATE_LISTENING || session_get_transport_proto (s) == TRANSPORT_PROTO_QUIC); return session_handle (s); } always_inline session_t * listen_session_get_from_handle (session_handle_t handle) { return session_get_from_handle (handle); } always_inline void listen_session_parse_handle (session_handle_t handle, u32 * index, u32 * thread_index) { session_parse_handle (handle, index, thread_index); } always_inline session_t * listen_session_alloc (u8 thread_index, session_type_t type) { session_t *s; s = session_alloc (thread_index); s->session_type = type; s->session_state = SESSION_STATE_LISTENING; return s; } always_inline session_t * listen_session_get (u32 ls_index) { return session_get (ls_index, 0); } always_inline void listen_session_free (session_t * s) { ASSERT (!s->rx_fifo); session_free (s); } always_inline session_t * ho_session_alloc (void) { session_t *s; ASSERT (vlib_get_thread_index () == 0); s = session_alloc (0); s->session_state = SESSION_STATE_CONNECTING; s->flags |= SESSION_F_HALF_OPEN; return s; } always_inline session_t * ho_session_get (u32 ho_index) { return session_get (ho_index, 0 /* half-open thread */); } always_inline void ho_session_free (session_t *s) { ASSERT (!s->rx_fifo && s->thread_index == 0); session_free (s); } transport_connection_t *listen_session_get_transport (session_t * s); /* * Session layer functions */ always_inline session_main_t * vnet_get_session_main () { return &session_main; } always_inline session_worker_t * session_main_get_worker (u32 thread_index) { return &session_main.wrk[thread_index]; } static inline session_worker_t * session_main_get_worker_if_valid (u32 thread_index) { if (thread_index > vec_len (session_main.wrk)) return 0; return &session_main.wrk[thread_index]; } always_inline svm_msg_q_t * session_main_get_vpp_event_queue (u32 thread_index) { return session_main.wrk[thread_index].vpp_event_queue; } always_inline u8 session_main_is_enabled () { return session_main.is_enabled == 1; } #define session_cli_return_if_not_enabled() \ do { \ if (!session_main.is_enabled) \ return clib_error_return (0, "session layer is not enabled"); \ } while (0) int session_main_flush_enqueue_events (u8 proto, u32 thread_index); int session_main_flush_all_enqueue_events (u8 transport_proto); void session_queue_run_on_main_thread (vlib_main_t * vm); /** * Add session node pending buffer with custom node * * @param thread_index worker thread expected to send the buffer * @param bi buffer index * @param next_node next node edge index for buffer. Edge to next node * must exist */ always_inline void session_add_pending_tx_buffer (u32 thread_index, u32 bi, u32 next_node) { session_worker_t *wrk = session_main_get_worker (thread_index); vec_add1 (wrk->pending_tx_buffers, bi); vec_add1 (wrk->pending_tx_nexts, next_node); if (PREDICT_FALSE (wrk->state == SESSION_WRK_INTERRUPT)) vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index); } always_inline void session_wrk_update_time (session_worker_t *wrk, f64 now) { wrk->last_vlib_time = now; wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ; } void session_wrk_enable_adaptive_mode (session_worker_t *wrk); fifo_segment_t *session_main_get_evt_q_segment (void); void session_node_enable_disable (u8 is_en); clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en); session_t *session_alloc_for_connection (transport_connection_t * tc); session_t *session_alloc_for_half_open (transport_connection_t *tc); #endif /* __included_session_h__ */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */