/* * Copyright (c) 2017 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. */ /** * @file * @brief Session and session manager */ #include #include #include #include #include #include #include session_manager_main_t session_manager_main; extern transport_proto_vft_t *tp_vfts; static void session_send_evt_to_thread (u64 session_handle, fifo_event_type_t evt_type, u32 thread_index, void *fp, void *rpc_args) { u32 tries = 0; session_fifo_event_t evt = { {0}, }; unix_shared_memory_queue_t *q; evt.event_type = evt_type; if (evt_type == FIFO_EVENT_RPC) { evt.rpc_args.fp = fp; evt.rpc_args.arg = rpc_args; } else evt.session_handle = session_handle; q = session_manager_get_vpp_event_queue (thread_index); while (unix_shared_memory_queue_add (q, (u8 *) & evt, 1)) { if (tries++ == 3) { SESSION_DBG ("failed to enqueue evt"); break; } } } void session_send_session_evt_to_thread (u64 session_handle, fifo_event_type_t evt_type, u32 thread_index) { session_send_evt_to_thread (session_handle, evt_type, thread_index, 0, 0); } void session_send_rpc_evt_to_thread (u32 thread_index, void *fp, void *rpc_args) { if (thread_index != vlib_get_thread_index ()) session_send_evt_to_thread (0, FIFO_EVENT_RPC, thread_index, fp, rpc_args); else { void (*fnp) (void *) = fp; fnp (rpc_args); } } stream_session_t * session_alloc (u32 thread_index) { session_manager_main_t *smm = &session_manager_main; stream_session_t *s; u8 will_expand = 0; pool_get_aligned_will_expand (smm->sessions[thread_index], will_expand, CLIB_CACHE_LINE_BYTES); /* If we have peekers, let them finish */ if (PREDICT_FALSE (will_expand)) { clib_spinlock_lock_if_init (&smm->peekers_write_locks[thread_index]); pool_get_aligned (session_manager_main.sessions[thread_index], s, CLIB_CACHE_LINE_BYTES); clib_spinlock_unlock_if_init (&smm->peekers_write_locks[thread_index]); } else { pool_get_aligned (session_manager_main.sessions[thread_index], s, CLIB_CACHE_LINE_BYTES); } memset (s, 0, sizeof (*s)); s->session_index = s - session_manager_main.sessions[thread_index]; s->thread_index = thread_index; return s; } static void session_free (stream_session_t * s) { pool_put (session_manager_main.sessions[s->thread_index], s); if (CLIB_DEBUG) memset (s, 0xFA, sizeof (*s)); } static int session_alloc_fifos (segment_manager_t * sm, stream_session_t * s) { svm_fifo_t *server_rx_fifo = 0, *server_tx_fifo = 0; u32 fifo_segment_index; int rv; if ((rv = segment_manager_alloc_session_fifos (sm, &server_rx_fifo, &server_tx_fifo, &fifo_segment_index))) return rv; /* Initialize backpointers */ server_rx_fifo->master_session_index = s->session_index; server_rx_fifo->master_thread_index = s->thread_index; server_tx_fifo->master_session_index = s->session_index; server_tx_fifo->master_thread_index = s->thread_index; s->server_rx_fifo = server_rx_fifo; s->server_tx_fifo = server_tx_fifo; s->svm_segment_index = fifo_segment_index; return 0; } static stream_session_t * session_alloc_for_connection (transport_connection_t * tc) { stream_session_t *s; u32 thread_index = tc->thread_index; ASSERT (thread_index == vlib_get_thread_index ()); s = session_alloc (thread_index); s->session_type = session_type_from_proto_and_ip (tc->proto, tc->is_ip4); s->session_state = SESSION_STATE_CONNECTING; s->thread_index = thread_index; /* Attach transport to session and vice versa */ s->connection_index = tc->c_index; tc->s_index = s->session_index; return s; } static int session_alloc_and_init (segment_manager_t * sm, transport_connection_t * tc, u8 alloc_fifos, stream_session_t ** ret_s) { stream_session_t *s; int rv; s = session_alloc_for_connection (tc); if (alloc_fifos && (rv = session_alloc_fifos (sm, s))) { session_free (s); return rv; } /* Add to the main lookup table */ session_lookup_add_connection (tc, session_handle (s)); *ret_s = s; return 0; } /** * Discards bytes from buffer chain * * It discards n_bytes_to_drop starting at first buffer after chain_b */ always_inline void session_enqueue_discard_chain_bytes (vlib_main_t * vm, vlib_buffer_t * b, vlib_buffer_t ** chain_b, u32 n_bytes_to_drop) { vlib_buffer_t *next = *chain_b; u32 to_drop = n_bytes_to_drop; ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT); while (to_drop && (next->flags & VLIB_BUFFER_NEXT_PRESENT)) { next = vlib_get_buffer (vm, next->next_buffer); if (next->current_length > to_drop) { vlib_buffer_advance (next, to_drop); to_drop = 0; } else { to_drop -= next->current_length; next->current_length = 0; } } *chain_b = next; if (to_drop == 0) b->total_length_not_including_first_buffer -= n_bytes_to_drop; } /** * Enqueue buffer chain tail */ always_inline int session_enqueue_chain_tail (stream_session_t * s, vlib_buffer_t * b, u32 offset, u8 is_in_order) { vlib_buffer_t *chain_b; u32 chain_bi, len, diff; vlib_main_t *vm = vlib_get_main (); u8 *data; u32 written = 0; int rv = 0; if (is_in_order && offset) { diff = offset - b->current_length; if (diff > b->total_length_not_including_first_buffer) return 0; chain_b = b; session_enqueue_discard_chain_bytes (vm, b, &chain_b, diff); chain_bi = vlib_get_buffer_index (vm, chain_b); } else chain_bi = b->next_buffer; do { chain_b = vlib_get_buffer (vm, chain_bi); data = vlib_buffer_get_current (chain_b); len = chain_b->current_length; if (!len) continue; if (is_in_order) { rv = svm_fifo_enqueue_nowait (s->server_rx_fifo, len, data); if (rv == len) { written += rv; } else if (rv < len) { return (rv > 0) ? (written + rv) : written; } else if (rv > len) { written += rv; /* written more than what was left in chain */ if (written > b->total_length_not_including_first_buffer) return written; /* drop the bytes that have already been delivered */ session_enqueue_discard_chain_bytes (vm, b, &chain_b, rv - len); } } else { rv = svm_fifo_enqueue_with_offset (s->server_rx_fifo, offset, len, data); if (rv) { clib_warning ("failed to enqueue multi-buffer seg"); return -1; } offset += len; } } while ((chain_bi = (chain_b->flags & VLIB_BUFFER_NEXT_PRESENT) ? chain_b->next_buffer : 0)); if (is_in_order) return written; return 0; } /* * Enqueue data for delivery to session peer. Does not notify peer of enqueue * event but on request can queue notification events for later delivery by * calling stream_server_flush_enqueue_events(). * * @param tc Transport connection which is to be enqueued data * @param b Buffer to be enqueued * @param offset Offset at which to start enqueueing if out-of-order * @param queue_event Flag to indicate if peer is to be notified or if event * is to be queued. The former is useful when more data is * enqueued and only one event is to be generated. * @param is_in_order Flag to indicate if data is in order * @return Number of bytes enqueued or a negative value if enqueueing failed. */ int session_enqueue_stream_connection (transport_connection_t * tc, vlib_buffer_t * b, u32 offset, u8 queue_event, u8 is_in_order) { stream_session_t *s; int enqueued = 0, rv, in_order_off; s = session_get (tc->s_index, tc->thread_index); if (is_in_order) { enqueued = svm_fifo_enqueue_nowait (s->server_rx_fifo, b->current_length, vlib_buffer_get_current (b)); if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && enqueued >= 0)) { in_order_off = enqueued > b->current_length ? enqueued : 0; rv = session_enqueue_chain_tail (s, b, in_order_off, 1); if (rv > 0) enqueued += rv; } } else { rv = svm_fifo_enqueue_with_offset (s->server_rx_fifo, offset, b->current_length, vlib_buffer_get_current (b)); if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && !rv)) session_enqueue_chain_tail (s, b, offset + b->current_length, 0); /* if something was enqueued, report even this as success for ooo * segment handling */ return rv; } if (queue_event) { /* Queue RX event on this fifo. Eventually these will need to be flushed * by calling stream_server_flush_enqueue_events () */ session_manager_main_t *smm = vnet_get_session_manager_main (); u32 thread_index = s->thread_index; u32 enqueue_epoch = smm->current_enqueue_epoch[tc->proto][thread_index]; if (s->enqueue_epoch != enqueue_epoch) { s->enqueue_epoch = enqueue_epoch; vec_add1 (smm->session_to_enqueue[tc->proto][thread_index], s - smm->sessions[thread_index]); } } return enqueued; } int session_enqueue_dgram_connection (stream_session_t * s, vlib_buffer_t * b, u8 proto, u8 queue_event) { int enqueued = 0, rv, in_order_off; if (svm_fifo_max_enqueue (s->server_rx_fifo) < b->current_length) return -1; enqueued = svm_fifo_enqueue_nowait (s->server_rx_fifo, b->current_length, vlib_buffer_get_current (b)); if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && enqueued >= 0)) { in_order_off = enqueued > b->current_length ? enqueued : 0; rv = session_enqueue_chain_tail (s, b, in_order_off, 1); if (rv > 0) enqueued += rv; } if (queue_event) { /* Queue RX event on this fifo. Eventually these will need to be flushed * by calling stream_server_flush_enqueue_events () */ session_manager_main_t *smm = vnet_get_session_manager_main (); u32 thread_index = s->thread_index; u32 enqueue_epoch = smm->current_enqueue_epoch[proto][thread_index]; if (s->enqueue_epoch != enqueue_epoch) { s->enqueue_epoch = enqueue_epoch; vec_add1 (smm->session_to_enqueue[proto][thread_index], s - smm->sessions[thread_index]); } } return enqueued; } /** Check if we have space in rx fifo to push more bytes */ u8 stream_session_no_space (transport_connection_t * tc, u32 thread_index, u16 data_len) { stream_session_t *s = session_get (tc->s_index, thread_index); if (PREDICT_FALSE (s->session_state != SESSION_STATE_READY)) return 1; if (data_len > svm_fifo_max_enqueue (s->server_rx_fifo)) return 1; return 0; } u32 stream_session_tx_fifo_max_dequeue (transport_connection_t * tc) { stream_session_t *s = session_get (tc->s_index, tc->thread_index); if (!s->server_tx_fifo) return 0; return svm_fifo_max_dequeue (s->server_tx_fifo); } int stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer, u32 offset, u32 max_bytes) { stream_session_t *s = session_get (tc->s_index, tc->thread_index); return svm_fifo_peek (s->server_tx_fifo, offset, max_bytes, buffer); } u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes) { stream_session_t *s = session_get (tc->s_index, tc->thread_index); return svm_fifo_dequeue_drop (s->server_tx_fifo, max_bytes); } /** * Notify session peer that new data has been enqueued. * * @param s Stream session for which the event is to be generated. * @param block Flag to indicate if call should block if event queue is full. * * @return 0 on succes or negative number if failed to send notification. */ static int session_enqueue_notify (stream_session_t * s, u8 block) { application_t *app; session_fifo_event_t evt; unix_shared_memory_queue_t *q; if (PREDICT_FALSE (s->session_state == SESSION_STATE_CLOSED)) { /* Session is closed so app will never clean up. Flush rx fifo */ u32 to_dequeue = svm_fifo_max_dequeue (s->server_rx_fifo); if (to_dequeue) svm_fifo_dequeue_drop (s->server_rx_fifo, to_dequeue); return 0; } /* Get session's server */ app = application_get_if_valid (s->app_index); if (PREDICT_FALSE (app == 0)) { clib_warning ("invalid s->app_index = %d", s->app_index); return 0; } /* Built-in server? Hand event to the callback... */ if (app->cb_fns.builtin_server_rx_callback) return app->cb_fns.builtin_server_rx_callback (s); /* If no event, send one */ if (svm_fifo_set_event (s->server_rx_fifo)) { /* Fabricate event */ evt.fifo = s->server_rx_fifo; evt.event_type = FIFO_EVENT_APP_RX; /* Add event to server's event queue */ q = app->event_queue; /* Based on request block (or not) for lack of space */ if (block || PREDICT_TRUE (q->cursize < q->maxsize)) unix_shared_memory_queue_add (app->event_queue, (u8 *) & evt, 0 /* do wait for mutex */ ); else { clib_warning ("fifo full"); return -1; } } /* *INDENT-OFF* */ SESSION_EVT_DBG(SESSION_EVT_ENQ, s, ({ ed->data[0] = evt.event_type; ed->data[1] = svm_fifo_max_dequeue (s->server_rx_fifo); })); /* *INDENT-ON* */ return 0; } /** * Flushes queue of sessions that are to be notified of new data * enqueued events. * * @param thread_index Thread index for which the flush is to be performed. * @return 0 on success or a positive number indicating the number of * failures due to API queue being full. */ int session_manager_flush_enqueue_events (u8 transport_proto, u32 thread_index) { session_manager_main_t *smm = &session_manager_main; u32 *indices; stream_session_t *s; int i, errors = 0; indices = smm->session_to_enqueue[transport_proto][thread_index]; for (i = 0; i < vec_len (indices); i++) { s = session_get_if_valid (indices[i], thread_index); if (s == 0 || session_enqueue_notify (s, 0 /* don't block */ )) errors++; } vec_reset_length (indices); smm->session_to_enqueue[transport_proto][thread_index] = indices; smm->current_enqueue_epoch[transport_proto][thread_index]++; return errors; } /** * Init fifo tail and head pointers * * Useful if transport uses absolute offsets for tracking ooo segments. */ void stream_session_init_fifos_pointers (transport_connection_t * tc, u32 rx_pointer, u32 tx_pointer) { stream_session_t *s; s = session_get (tc->s_index, tc->thread_index); svm_fifo_init_pointers (s->server_rx_fifo, rx_pointer); svm_fifo_init_pointers (s->server_tx_fifo, tx_pointer); } int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail) { application_t *app; stream_session_t *new_s = 0; u64 handle; u32 opaque = 0; int error = 0; segment_manager_t *sm; u8 alloc_fifos; /* * Find connection handle and cleanup half-open table */ handle = session_lookup_half_open_handle (tc); if (handle == HALF_OPEN_LOOKUP_INVALID_VALUE) { SESSION_DBG ("half-open was removed!"); return -1; } session_lookup_del_half_open (tc); /* Get the app's index from the handle we stored when opening connection * and the opaque (api_context for external apps) from transport session * index */ app = application_get_if_valid (handle >> 32); if (!app) return -1; opaque = tc->s_index; /* * Allocate new session with fifos (svm segments are allocated if needed) */ if (!is_fail) { sm = application_get_connect_segment_manager (app); alloc_fifos = application_is_proxy (app); if (session_alloc_and_init (sm, tc, alloc_fifos, &new_s)) { is_fail = 1; error = -1; } else new_s->app_index = app->index; } /* * Notify client application */ if (app->cb_fns.session_connected_callback (app->index, opaque, new_s, is_fail)) { SESSION_DBG ("failed to notify app"); if (!is_fail) stream_session_disconnect (new_s); } else { if (!is_fail) new_s->session_state = SESSION_STATE_READY; } return error; } typedef struct _session_switch_pool_args { u32 session_index; u32 thread_index; u32 new_thread_index; u32 new_session_index; } session_switch_pool_args_t; static void session_switch_pool (void *cb_args) { session_switch_pool_args_t *args = (session_switch_pool_args_t *) cb_args; stream_session_t *s; ASSERT (args->thread_index == vlib_get_thread_index ()); s = session_get (args->session_index, args->thread_index); s->server_tx_fifo->master_session_index = args->new_session_index; s->server_tx_fifo->master_thread_index = args->new_thread_index; tp_vfts[s->session_type].cleanup (s->connection_index, s->thread_index); session_free (s); clib_mem_free (cb_args); } /** * Move dgram session to the right thread */ int session_dgram_connect_notify (transport_connection_t * tc, u32 old_thread_index, stream_session_t ** new_session) { stream_session_t *new_s; session_switch_pool_args_t *rpc_args; /* * Clone half-open session to the right thread. */ new_s = session_clone_safe (tc->s_index, old_thread_index); new_s->connection_index = tc->c_index; new_s->server_rx_fifo->master_session_index = new_s->session_index; new_s->server_rx_fifo->master_thread_index = new_s->thread_index; new_s->session_state = SESSION_STATE_READY; session_lookup_add_connection (tc, session_handle (new_s)); /* * Ask thread owning the old session to clean it up and make us the tx * fifo owner */ rpc_args = clib_mem_alloc (sizeof (*rpc_args)); rpc_args->new_session_index = new_s->session_index; rpc_args->new_thread_index = new_s->thread_index; rpc_args->session_index = tc->s_index; rpc_args->thread_index = old_thread_index; session_send_rpc_evt_to_thread (rpc_args->thread_index, session_switch_pool, rpc_args); tc->s_index = new_s->session_index; new_s->connection_index = tc->c_index; *new_session = new_s; return 0; } void stream_session_accept_notify (transport_connection_t * tc) { application_t *server; stream_session_t *s; s = session_get (tc->s_index, tc->thread_index); server = application_get (s->app_index); server->cb_fns.session_accept_callback (s); } /** * Notification from transport that connection is being closed. * * A disconnect is sent to application but state is not removed. Once * disconnect is acknowledged by application, session disconnect is called. * Ultimately this leads to close being called on transport (passive close). */ void stream_session_disconnect_notify (transport_connection_t * tc) { application_t *server; stream_session_t *s; s = session_get (tc->s_index, tc->thread_index); server = application_get (s->app_index); server->cb_fns.session_disconnect_callback (s); } /** * Cleans up session and lookup table. */ void stream_session_delete (stream_session_t * s) { int rv; /* Delete from the main lookup table. */ if ((rv = session_lookup_del_session (s))) clib_warning ("hash delete error, rv %d", rv); /* Cleanup fifo segments */ segment_manager_dealloc_fifos (s->svm_segment_index, s->server_rx_fifo, s->server_tx_fifo); session_free (s); } /** * Notification from transport that connection is being deleted * * This removes the session if it is still valid. It should be called only on * previously fully established sessions. For instance failed connects should * call stream_session_connect_notify and indicate that the connect has * failed. */ void stream_session_delete_notify (transport_connection_t * tc) { stream_session_t *s; /* App might've been removed already */ s = session_get_if_valid (tc->s_index, tc->thread_index); if (!s) return; stream_session_delete (s); } /** * Notify application that connection has been reset. */ void stream_session_reset_notify (transport_connection_t * tc) { stream_session_t *s; application_t *app; s = session_get (tc->s_index, tc->thread_index); app = application_get (s->app_index); app->cb_fns.session_reset_callback (s); } /** * Accept a stream session. Optionally ping the server by callback. */ int stream_session_accept (transport_connection_t * tc, u32 listener_index, u8 notify) { application_t *server; stream_session_t *s, *listener; segment_manager_t *sm; session_type_t sst; int rv; sst = session_type_from_proto_and_ip (tc->proto, tc->is_ip4); /* Find the server */ listener = listen_session_get (sst, listener_index); server = application_get (listener->app_index); sm = application_get_listen_segment_manager (server, listener); if ((rv = session_alloc_and_init (sm, tc, 1, &s))) return rv; s->app_index = server->index; s->listener_index = listener_index; s->session_state = SESSION_STATE_ACCEPTING; /* Shoulder-tap the server */ if (notify) { server->cb_fns.session_accept_callback (s); } return 0; } /** * Ask transport to open connection to remote transport endpoint. * * Stores handle for matching request with reply since the call can be * asynchronous. For instance, for TCP the 3-way handshake must complete * before reply comes. Session is only created once connection is established. * * @param app_index Index of the application requesting the connect * @param st Session type requested. * @param tep Remote transport endpoint * @param opaque Opaque data (typically, api_context) the application expects * on open completion. */ int session_open (u32 app_index, session_endpoint_t * rmt, u32 opaque) { transport_connection_t *tc; session_type_t sst; segment_manager_t *sm; stream_session_t *s; application_t *app; int rv; u64 handle; sst = session_type_from_proto_and_ip (rmt->transport_proto, rmt->is_ip4); rv = tp_vfts[sst].open (session_endpoint_to_transport (rmt)); if (rv < 0) { SESSION_DBG ("Transport failed to open connection."); return VNET_API_ERROR_SESSION_CONNECT; } tc = tp_vfts[sst].get_half_open ((u32) rv); /* If transport offers a stream service, only allocate session once the * connection has been established. */ if (transport_is_stream (rmt->transport_proto)) { /* Add connection to half-open table and save app and tc index. The * latter is needed to help establish the connection while the former * is needed when the connect notify comes and we have to notify the * external app */ handle = (((u64) app_index) << 32) | (u64) tc->c_index; session_lookup_add_half_open (tc, handle); /* Store api_context (opaque) for when the reply comes. Not the nicest * thing but better than allocating a separate half-open pool. */ tc->s_index = opaque; } /* For dgram type of service, allocate session and fifos now. */ else { app = application_get (app_index); sm = application_get_connect_segment_manager (app); if (session_alloc_and_init (sm, tc, 1, &s)) return -1; s->app_index = app->index; s->session_state = SESSION_STATE_CONNECTING_READY; /* Tell the app about the new event fifo for this session */ app->cb_fns.session_connected_callback (app->index, opaque, s, 0); } return 0; } /** * Ask transport to listen on local transport endpoint. * * @param s Session for which listen will be called. Note that unlike * established sessions, listen sessions are not associated to a * thread. * @param tep Local endpoint to be listened on. */ int stream_session_listen (stream_session_t * s, session_endpoint_t * sep) { transport_connection_t *tc; u32 tci; /* Transport bind/listen */ tci = tp_vfts[s->session_type].bind (s->session_index, session_endpoint_to_transport (sep)); if (tci == (u32) ~ 0) return -1; /* Attach transport to session */ s->connection_index = tci; tc = tp_vfts[s->session_type].get_listener (tci); /* Weird but handle it ... */ if (tc == 0) return -1; /* Add to the main lookup table */ session_lookup_add_connection (tc, s->session_index); return 0; } /** * Ask transport to stop listening on local transport endpoint. * * @param s Session to stop listening on. It must be in state LISTENING. */ int stream_session_stop_listen (stream_session_t * s) { transport_connection_t *tc; if (s->session_state != SESSION_STATE_LISTENING) { clib_warning ("not a listening session"); return -1; } tc = tp_vfts[s->session_type].get_listener (s->connection_index); if (!tc) { clib_warning ("no transport"); return VNET_API_ERROR_ADDRESS_NOT_IN_USE; } session_lookup_del_connection (tc); tp_vfts[s->session_type].unbind (s->connection_index); return 0; } /** * Disconnect session and propagate to transport. This should eventually * result in a delete notification that allows us to cleanup session state. * Called for both active/passive disconnects. * * Should be called from the session's thread. */ void stream_session_disconnect (stream_session_t * s) { s->session_state = SESSION_STATE_CLOSED; tp_vfts[s->session_type].close (s->connection_index, s->thread_index); } /** * Cleanup transport and session state. * * Notify transport of the cleanup, wait for a delete notify to actually * remove the session state. */ void stream_session_cleanup (stream_session_t * s) { int rv; s->session_state = SESSION_STATE_CLOSED; /* Delete from the main lookup table to avoid more enqueues */ rv = session_lookup_del_session (s); if (rv) clib_warning ("hash delete error, rv %d", rv); tp_vfts[s->session_type].cleanup (s->connection_index, s->thread_index); } /** * Allocate vpp event queue (once) per worker thread */ void session_vpp_event_queue_allocate (session_manager_main_t * smm, u32 thread_index) { api_main_t *am = &api_main; void *oldheap; u32 event_queue_length = 2048; if (smm->vpp_event_queues[thread_index] == 0) { /* Allocate event fifo in the /vpe-api shared-memory segment */ oldheap = svm_push_data_heap (am->vlib_rp); if (smm->configured_event_queue_length) event_queue_length = smm->configured_event_queue_length; smm->vpp_event_queues[thread_index] = unix_shared_memory_queue_init (event_queue_length, sizeof (session_fifo_event_t), 0 /* consumer pid */ , 0 /* (do not) send signal when queue non-empty */ ); svm_pop_heap (oldheap); } } session_type_t session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4) { if (proto == TRANSPORT_PROTO_TCP) { if (is_ip4) return SESSION_TYPE_IP4_TCP; else return SESSION_TYPE_IP6_TCP; } else { if (is_ip4) return SESSION_TYPE_IP4_UDP; else return SESSION_TYPE_IP6_UDP; } return SESSION_N_TYPES; } transport_connection_t * session_get_transport (stream_session_t * s) { if (s->session_state >= SESSION_STATE_READY) return tp_vfts[s->session_type].get_connection (s->connection_index, s->thread_index); return 0; } transport_connection_t * listen_session_get_transport (stream_session_t * s) { return tp_vfts[s->session_type].get_listener (s->connection_index); } int listen_session_get_local_session_endpoint (stream_session_t * listener, session_endpoint_t * sep) { transport_connection_t *tc; tc = tp_vfts[listener->session_type].get_listener (listener->connection_index); if (!tc) { clib_warning ("no transport"); return -1; } /* N.B. The ip should not be copied because this is the local endpoint */ sep->port = tc->lcl_port; sep->transport_proto = tc->proto; sep->is_ip4 = tc->is_ip4; return 0; } static clib_error_t * session_manager_main_enable (vlib_main_t * vm) { session_manager_main_t *smm = &session_manager_main; vlib_thread_main_t *vtm = vlib_get_thread_main (); u32 num_threads; u32 preallocated_sessions_per_worker; int i, j; num_threads = 1 /* main thread */ + vtm->n_threads; if (num_threads < 1) return clib_error_return (0, "n_thread_stacks not set"); /* $$$ config parameters */ svm_fifo_segment_init (0x200000000ULL /* first segment base VA */ , 20 /* timeout in seconds */ ); /* configure per-thread ** vectors */ vec_validate (smm->sessions, num_threads - 1); vec_validate (smm->tx_buffers, num_threads - 1); vec_validate (smm->pending_event_vector, num_threads - 1); vec_validate (smm->pending_disconnects, num_threads - 1); vec_validate (smm->free_event_vector, num_threads - 1); vec_validate (smm->vpp_event_queues, num_threads - 1); vec_validate (smm->session_peekers, num_threads - 1); vec_validate (smm->peekers_readers_locks, num_threads - 1); vec_validate (smm->peekers_write_locks, num_threads - 1); for (i = 0; i < TRANSPORT_N_PROTO; i++) for (j = 0; j < num_threads; j++) { vec_validate (smm->session_to_enqueue[i], num_threads - 1); vec_validate (smm->current_enqueue_epoch[i], num_threads - 1); } for (i = 0; i < num_threads; i++) { vec_validate (smm->free_event_vector[i], 0); _vec_len (smm->free_event_vector[i]) = 0; vec_validate (smm->pending_event_vector[i], 0); _vec_len (smm->pending_event_vector[i]) = 0; vec_validate (smm->pending_disconnects[i], 0); _vec_len (smm->pending_disconnects[i]) = 0; } #if SESSION_DBG vec_validate (smm->last_event_poll_by_thread, num_threads - 1); #endif /* Allocate vpp event queues */ for (i = 0; i < vec_len (smm->vpp_event_queues); i++) session_vpp_event_queue_allocate (smm, i); /* Preallocate sessions */ if (smm->preallocated_sessions) { if (num_threads == 1) { pool_init_fixed (smm->sessions[0], smm->preallocated_sessions); } else { int j; preallocated_sessions_per_worker = (1.1 * (f64) smm->preallocated_sessions / (f64) (num_threads - 1)); for (j = 1; j < num_threads; j++) { pool_init_fixed (smm->sessions[j], preallocated_sessions_per_worker); } } } session_lookup_init (); app_namespaces_init (); transport_init (); smm->is_enabled = 1; /* Enable TCP transport */ vnet_tcp_enable_disable (vm, 1); return 0; } void session_node_enable_disable (u8 is_en) { u8 state = is_en ? VLIB_NODE_STATE_POLLING : VLIB_NODE_STATE_DISABLED; /* *INDENT-OFF* */ foreach_vlib_main (({ vlib_node_set_state (this_vlib_main, session_queue_node.index, state); })); /* *INDENT-ON* */ } clib_error_t * vnet_session_enable_disable (vlib_main_t * vm, u8 is_en) { clib_error_t *error = 0; if (is_en) { if (session_manager_main.is_enabled) return 0; session_node_enable_disable (is_en); error = session_manager_main_enable (vm); } else { session_manager_main.is_enabled = 0; session_node_enable_disable (is_en); } return error; } clib_error_t * session_manager_main_init (vlib_main_t * vm) { session_manager_main_t *smm = &session_manager_main; smm->is_enabled = 0; return 0; } VLIB_INIT_FUNCTION (session_manager_main_init); static clib_error_t * session_config_fn (vlib_main_t * vm, unformat_input_t * input) { session_manager_main_t *smm = &session_manager_main; u32 nitems; uword tmp; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "event-queue-length %d", &nitems)) { if (nitems >= 2048) smm->configured_event_queue_length = nitems; else clib_warning ("event queue length %d too small, ignored", nitems); } else if (unformat (input, "preallocated-sessions %d", &smm->preallocated_sessions)) ; else if (unformat (input, "v4-session-table-buckets %d", &smm->configured_v4_session_table_buckets)) ; else if (unformat (input, "v4-halfopen-table-buckets %d", &smm->configured_v4_halfopen_table_buckets)) ; else if (unformat (input, "v6-session-table-buckets %d", &smm->configured_v6_session_table_buckets)) ; else if (unformat (input, "v6-halfopen-table-buckets %d", &smm->configured_v6_halfopen_table_buckets)) ; else if (unformat (input, "v4-session-table-memory %U", unformat_memory_size, &tmp)) { if (tmp >= 0x100000000) return clib_error_return (0, "memory size %llx (%lld) too large", tmp, tmp); smm->configured_v4_session_table_memory = tmp; } else if (unformat (input, "v4-halfopen-table-memory %U", unformat_memory_size, &tmp)) { if (tmp >= 0x100000000) return clib_error_return (0, "memory size %llx (%lld) too large", tmp, tmp); smm->configured_v4_halfopen_table_memory = tmp; } else if (unformat (input, "v6-session-table-memory %U", unformat_memory_size, &tmp)) { if (tmp >= 0x100000000) return clib_error_return (0, "memory size %llx (%lld) too large", tmp, tmp); smm->configured_v6_session_table_memory = tmp; } else if (unformat (input, "v6-halfopen-table-memory %U", unformat_memory_size, &tmp)) { if (tmp >= 0x100000000) return clib_error_return (0, "memory size %llx (%lld) too large", tmp, tmp); smm->configured_v6_halfopen_table_memory = tmp; } else return clib_error_return (0, "unknown input `%U'", format_unformat_error, input); } return 0; } VLIB_CONFIG_FUNCTION (session_config_fn, "session"); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */