/* * 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 <vnet/session/session_types.h> #include <vnet/session/session_lookup.h> #include <vnet/session/session_debug.h> #include <vnet/session/segment_manager.h> #include <svm/message_queue.h> #define SESSION_PROXY_LISTENER_INDEX ((u8)~0 - 1) #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") \ _(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair") \ _(NO_SPACE, "Couldn't allocate a fifo pair") \ _(SEG_CREATE, "Couldn't create a new segment") typedef enum { #define _(sym,str) SESSION_ERROR_##sym, foreach_session_input_error #undef _ SESSION_N_ERROR, } session_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; vlib_buffer_t *b; u32 max_dequeue; u32 snd_space; u32 left_to_snd; u32 tx_offset; u32 max_len_to_snd; u16 deq_per_first_buf; u16 deq_per_buf; u16 snd_mss; u16 n_segs_per_evt; u8 n_bufs_per_seg; CLIB_CACHE_LINE_ALIGN_MARK (cacheline1); session_dgram_hdr_t hdr; } session_tx_context_t; typedef struct session_manager_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; /** Our approximation of a "complete" dispatch loop period */ f64 dispatch_period; /** vlib_time_now last time around the track */ f64 last_vlib_time; /** Per-proto enqueue epoch counters */ u64 current_enqueue_epoch[TRANSPORT_N_PROTO]; /** Per-proto vector of sessions to enqueue */ u32 *session_to_enqueue[TRANSPORT_N_PROTO]; /** Context for session tx */ session_tx_context_t ctx; /** Vector of tx buffer free lists */ u32 *tx_buffers; /** Vector of partially read events */ session_event_t *free_event_vector; /** Vector of active event vectors */ session_event_t *pending_event_vector; /** Vector of postponed disconnects */ session_event_t *pending_disconnects; /** Vector of postponed events */ session_event_t *postponed_event_vector; /** Peekers rw lock */ clib_rwlock_t peekers_rw_locks; u32 last_tx_packets; } session_manager_worker_t; typedef int (session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node, session_manager_worker_t * wrk, session_event_t * e, int *n_tx_pkts); 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_manager_main_ { /** Worker contexts */ session_manager_worker_t *wrk; /** Event queues memfd segment initialized only if so configured */ ssvm_private_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; /* * Config parameters */ /** Session manager is enabled */ u8 is_enabled; /** 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; u8 evt_qs_use_memfd_seg; /** 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; #if SESSION_DEBUG /** * last event poll time by thread * Debug only. Will cause false cache-line sharing as-is */ f64 *last_event_poll_by_thread; #endif } session_manager_main_t; extern session_manager_main_t session_manager_main; extern vlib_node_registration_t session_queue_node; extern vlib_node_registration_t session_queue_process_node; #define SESSION_Q_PROCESS_FLUSH_FRAMES 1 #define SESSION_Q_PROCESS_STOP 2 always_inline u8 stream_session_is_valid (u32 si, u8 thread_index) { session_t *s; s = pool_elt_at_index (session_manager_main.wrk[thread_index].sessions, si); if (s->thread_index != thread_index || s->session_index != si /* || s->server_rx_fifo->master_session_index != si || s->server_tx_fifo->master_session_index != si || s->server_rx_fifo->master_thread_index != thread_index || s->server_tx_fifo->master_thread_index != thread_index */ ) return 0; return 1; } session_t *session_alloc (u32 thread_index); void session_free (session_t * s); void session_free_w_fifos (session_t * s); always_inline session_t * session_get (u32 si, u32 thread_index) { ASSERT (stream_session_is_valid (si, thread_index)); return pool_elt_at_index (session_manager_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_manager_main.wrk)) return 0; if (pool_is_free_index (session_manager_main.wrk[thread_index].sessions, si)) return 0; ASSERT (stream_session_is_valid (si, thread_index)); return pool_elt_at_index (session_manager_main.wrk[thread_index].sessions, si); } always_inline session_t * session_get_from_handle (session_handle_t handle) { session_manager_main_t *smm = &session_manager_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); } always_inline u64 session_segment_handle (session_t * s) { svm_fifo_t *f; if (s->session_state == SESSION_STATE_LISTENING) return SESSION_INVALID_HANDLE; f = s->rx_fifo; return segment_manager_make_segment_handle (f->segment_manager, f->segment_index); } /** * 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_manager_worker_t *wrk = &session_manager_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_manager_worker_t *wrk = &session_manager_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_manager_worker_t *wrk = &session_manager_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_manager_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_manager_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 (u32 app_index, session_endpoint_t * tep, u32 opaque); int session_listen (session_t * s, session_endpoint_cfg_t * sep); int session_stop_listen (session_t * s); void session_close (session_t * s); void session_transport_close (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_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); transport_connection_t *session_get_transport (session_t * s); u8 *format_stream_session (u8 * s, va_list * args); uword unformat_stream_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 stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer, u32 offset, u32 max_bytes); u32 session_dequeue_drop (transport_connection_t * tc, u32 max_bytes); int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail); int session_dgram_connect_notify (transport_connection_t * tc, u32 old_thread_index, session_t ** new_session); void stream_session_init_fifos_pointers (transport_connection_t * tc, u32 rx_pointer, u32 tx_pointer); 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_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, u8 notify); u32 session_tx_fifo_max_dequeue (transport_connection_t * tc); void session_register_transport (transport_proto_t transport_proto, const transport_proto_vft_t * vft, u8 is_ip4, u32 output_node); 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 (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 (s->tx_fifo); } always_inline u32 transport_rx_fifo_size (transport_connection_t * tc) { session_t *s = session_get (tc->s_index, tc->thread_index); return s->rx_fifo->nitems; } always_inline u32 transport_tx_fifo_size (transport_connection_t * tc) { session_t *s = session_get (tc->s_index, tc->thread_index); return s->tx_fifo->nitems; } 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 f64 transport_dispatch_period (u32 thread_index) { return session_manager_main.wrk[thread_index].dispatch_period; } always_inline f64 transport_time_now (u32 thread_index) { return session_manager_main.wrk[thread_index].last_vlib_time; } 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, FIFO_EVENT_APP_TX); } /* * Listen sessions */ always_inline u64 listen_session_get_handle (session_t * s) { ASSERT (s->session_state == SESSION_STATE_LISTENING); 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_new (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 index) { return session_get (index, 0); } always_inline void listen_session_del (session_t * s) { session_free (s); } transport_connection_t *listen_session_get_transport (session_t * s); int listen_session_get_local_session_endpoint (session_t * listener, session_endpoint_t * sep); /* * Session manager functions */ always_inline session_manager_main_t * vnet_get_session_manager_main () { return &session_manager_main; } always_inline session_manager_worker_t * session_manager_get_worker (u32 thread_index) { return &session_manager_main.wrk[thread_index]; } always_inline svm_msg_q_t * session_manager_get_vpp_event_queue (u32 thread_index) { return session_manager_main.wrk[thread_index].vpp_event_queue; } always_inline u8 session_manager_is_enabled () { return session_manager_main.is_enabled == 1; } #define session_cli_return_if_not_enabled() \ do { \ if (!session_manager_main.is_enabled) \ return clib_error_return(0, "session layer is not enabled"); \ } while (0) int session_manager_flush_enqueue_events (u8 proto, u32 thread_index); int session_manager_flush_all_enqueue_events (u8 transport_proto); void session_flush_frames_main_thread (vlib_main_t * vm); ssvm_private_t *session_manager_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); #endif /* __included_session_h__ */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */