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Diffstat (limited to 'src/vnet/session/session.c')
| -rw-r--r-- | src/vnet/session/session.c | 1036 |
1 files changed, 1036 insertions, 0 deletions
diff --git a/src/vnet/session/session.c b/src/vnet/session/session.c new file mode 100644 index 00000000..dc930ce8 --- /dev/null +++ b/src/vnet/session/session.c @@ -0,0 +1,1036 @@ +/* + * 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 <vnet/session/session.h> +#include <vnet/session/session_debug.h> +#include <vnet/session/application.h> +#include <vlibmemory/api.h> +#include <vnet/dpo/load_balance.h> +#include <vnet/fib/ip4_fib.h> +#include <vnet/tcp/tcp.h> + +session_manager_main_t session_manager_main; +extern transport_proto_vft_t *tp_vfts; + +int +stream_session_create_i (segment_manager_t * sm, transport_connection_t * tc, + u8 alloc_fifos, stream_session_t ** ret_s) +{ + session_manager_main_t *smm = &session_manager_main; + svm_fifo_t *server_rx_fifo = 0, *server_tx_fifo = 0; + u32 fifo_segment_index; + u32 pool_index; + stream_session_t *s; + u64 value; + u32 thread_index = tc->thread_index; + int rv; + + ASSERT (thread_index == vlib_get_thread_index ()); + + /* Create the session */ + pool_get_aligned (smm->sessions[thread_index], s, CLIB_CACHE_LINE_BYTES); + memset (s, 0, sizeof (*s)); + pool_index = s - smm->sessions[thread_index]; + + /* Allocate fifos */ + if (alloc_fifos) + { + if ((rv = segment_manager_alloc_session_fifos (sm, &server_rx_fifo, + &server_tx_fifo, + &fifo_segment_index))) + { + pool_put (smm->sessions[thread_index], s); + return rv; + } + /* Initialize backpointers */ + server_rx_fifo->master_session_index = pool_index; + server_rx_fifo->master_thread_index = thread_index; + + server_tx_fifo->master_session_index = pool_index; + server_tx_fifo->master_thread_index = thread_index; + + s->server_rx_fifo = server_rx_fifo; + s->server_tx_fifo = server_tx_fifo; + s->svm_segment_index = fifo_segment_index; + } + + /* Initialize state machine, such as it is... */ + s->session_type = session_type_from_proto_and_ip (tc->transport_proto, + tc->is_ip4); + s->session_state = SESSION_STATE_CONNECTING; + s->thread_index = thread_index; + s->session_index = pool_index; + + /* Attach transport to session */ + s->connection_index = tc->c_index; + + /* Attach session to transport */ + tc->s_index = s->session_index; + + /* Add to the main lookup table */ + value = stream_session_handle (s); + stream_session_table_add_for_tc (tc, value); + + *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 +stream_session_enqueue_data (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 = stream_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 my_enqueue_epoch = smm->current_enqueue_epoch[thread_index]; + + if (s->enqueue_epoch != my_enqueue_epoch) + { + s->enqueue_epoch = my_enqueue_epoch; + vec_add1 (smm->session_indices_to_enqueue_by_thread[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 = stream_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 = stream_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 = stream_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 = stream_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 +stream_session_enqueue_notify (stream_session_t * s, u8 block) +{ + application_t *app; + session_fifo_event_t evt; + unix_shared_memory_queue_t *q; + static u32 serial_number; + + 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; + evt.event_id = serial_number++; + + /* 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_id; + 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 (u32 thread_index) +{ + session_manager_main_t *smm = &session_manager_main; + u32 *session_indices_to_enqueue; + int i, errors = 0; + + session_indices_to_enqueue = + smm->session_indices_to_enqueue_by_thread[thread_index]; + + for (i = 0; i < vec_len (session_indices_to_enqueue); i++) + { + stream_session_t *s0; + + /* Get session */ + s0 = stream_session_get_if_valid (session_indices_to_enqueue[i], + thread_index); + if (s0 == 0 || stream_session_enqueue_notify (s0, 0 /* don't block */ )) + { + errors++; + } + } + + vec_reset_length (session_indices_to_enqueue); + + smm->session_indices_to_enqueue_by_thread[thread_index] = + session_indices_to_enqueue; + + /* Increment enqueue epoch for next round */ + smm->current_enqueue_epoch[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 = stream_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 +stream_session_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; + u8 st; + + st = session_type_from_proto_and_ip (tc->transport_proto, tc->is_ip4); + handle = stream_session_half_open_lookup_handle (&tc->lcl_ip, &tc->rmt_ip, + tc->lcl_port, tc->rmt_port, + st); + if (handle == HALF_OPEN_LOOKUP_INVALID_VALUE) + { + TCP_DBG ("half-open was removed!"); + return -1; + } + + /* Cleanup half-open table */ + stream_session_half_open_table_del (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; + + if (!is_fail) + { + segment_manager_t *sm; + u8 alloc_fifos; + sm = application_get_connect_segment_manager (app); + alloc_fifos = application_is_proxy (app); + /* Create new session (svm segments are allocated if needed) */ + if (stream_session_create_i (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)) + { + clib_warning ("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; +} + +void +stream_session_accept_notify (transport_connection_t * tc) +{ + application_t *server; + stream_session_t *s; + + s = stream_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 = stream_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) +{ + session_manager_main_t *smm = vnet_get_session_manager_main (); + int rv; + + /* Delete from the main lookup table. */ + if ((rv = stream_session_table_del (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); + + pool_put (smm->sessions[s->thread_index], s); + if (CLIB_DEBUG) + memset (s, 0xFA, sizeof (*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 = stream_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 = stream_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 sst, u8 notify) +{ + application_t *server; + stream_session_t *s, *listener; + segment_manager_t *sm; + + int rv; + + /* 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 = stream_session_create_i (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 res Resulting transport connection . + */ +int +stream_session_open (u32 app_index, session_type_t st, + transport_endpoint_t * rmt, + transport_connection_t ** res) +{ + transport_connection_t *tc; + int rv; + u64 handle; + + rv = tp_vfts[st].open (rmt); + if (rv < 0) + { + clib_warning ("Transport failed to open connection."); + return VNET_API_ERROR_SESSION_CONNECT_FAIL; + } + + tc = tp_vfts[st].get_half_open ((u32) rv); + + /* 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; + + /* Add to the half-open lookup table */ + stream_session_half_open_table_add (tc, handle); + + *res = tc; + + 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, transport_endpoint_t * tep) +{ + transport_connection_t *tc; + u32 tci; + + /* Transport bind/listen */ + tci = tp_vfts[s->session_type].bind (s->session_index, tep); + + 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 */ + stream_session_table_add_for_tc (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; + } + + stream_session_table_del_for_tc (tc); + tp_vfts[s->session_type].unbind (s->connection_index); + return 0; +} + +void +session_send_session_evt_to_thread (u64 session_handle, + fifo_event_type_t evt_type, + u32 thread_index) +{ + static u16 serial_number = 0; + u32 tries = 0; + session_fifo_event_t evt; + unix_shared_memory_queue_t *q; + + /* Fabricate event */ + evt.session_handle = session_handle; + evt.event_type = evt_type; + evt.event_id = serial_number++; + + q = session_manager_get_vpp_event_queue (thread_index); + while (unix_shared_memory_queue_add (q, (u8 *) & evt, 1)) + { + if (tries++ == 3) + { + TCP_DBG ("failed to enqueue evt"); + break; + } + } +} + +/** + * 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 = stream_session_table_del (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; +} + +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; + + 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->session_indices_to_enqueue_by_thread, num_threads - 1); + vec_validate (smm->tx_buffers, num_threads - 1); + vec_validate (smm->pending_event_vector, num_threads - 1); + vec_validate (smm->free_event_vector, num_threads - 1); + vec_validate (smm->current_enqueue_epoch, num_threads - 1); + vec_validate (smm->vpp_event_queues, 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; + } + +#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 (); + + 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) +{ + if (is_en) + { + if (session_manager_main.is_enabled) + return 0; + + session_node_enable_disable (is_en); + + return session_manager_main_enable (vm); + } + else + { + session_manager_main.is_enabled = 0; + session_node_enable_disable (is_en); + } + + return 0; +} + +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: + */ |