From 04e5344a358a9ad42d896486d2d226149fd326f4 Mon Sep 17 00:00:00 2001 From: Florin Coras Date: Sun, 16 Jul 2017 17:12:15 -0700 Subject: Cleanup/refactor session layer code Change-Id: Ica99e8cb919fca6b069c37c969d60e8ccc2c6bf9 Signed-off-by: Florin Coras --- src/vnet/session/node.c | 685 ------------------------------------------------ 1 file changed, 685 deletions(-) delete mode 100644 src/vnet/session/node.c (limited to 'src/vnet/session/node.c') diff --git a/src/vnet/session/node.c b/src/vnet/session/node.c deleted file mode 100644 index 8d703b0b302..00000000000 --- a/src/vnet/session/node.c +++ /dev/null @@ -1,685 +0,0 @@ -/* - * 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. - */ - -#include -#include -#include -#include -#include -#include -#include -#include - -vlib_node_registration_t session_queue_node; - -typedef struct -{ - u32 session_index; - u32 server_thread_index; -} session_queue_trace_t; - -/* packet trace format function */ -static u8 * -format_session_queue_trace (u8 * s, va_list * args) -{ - CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); - CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); - session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *); - - s = format (s, "SESSION_QUEUE: session index %d, server thread index %d", - t->session_index, t->server_thread_index); - return s; -} - -vlib_node_registration_t session_queue_node; - -#define foreach_session_queue_error \ -_(TX, "Packets transmitted") \ -_(TIMER, "Timer events") \ -_(NO_BUFFER, "Out of buffers") - -typedef enum -{ -#define _(sym,str) SESSION_QUEUE_ERROR_##sym, - foreach_session_queue_error -#undef _ - SESSION_QUEUE_N_ERROR, -} session_queue_error_t; - -static char *session_queue_error_strings[] = { -#define _(sym,string) string, - foreach_session_queue_error -#undef _ -}; - -static u32 session_type_to_next[] = { - SESSION_QUEUE_NEXT_TCP_IP4_OUTPUT, - SESSION_QUEUE_NEXT_IP4_LOOKUP, - SESSION_QUEUE_NEXT_TCP_IP6_OUTPUT, - SESSION_QUEUE_NEXT_IP6_LOOKUP, -}; - -always_inline void -session_tx_fifo_chain_tail (session_manager_main_t * smm, vlib_main_t * vm, - u8 thread_index, svm_fifo_t * fifo, - vlib_buffer_t * b0, u32 bi0, u8 n_bufs_per_seg, - u32 * left_to_snd0, u16 * n_bufs, u32 * rx_offset, - u16 deq_per_buf, u8 peek_data) -{ - vlib_buffer_t *chain_b0, *prev_b0; - u32 chain_bi0; - u16 len_to_deq0, n_bytes_read; - u8 *data0, j; - - chain_bi0 = bi0; - chain_b0 = b0; - for (j = 1; j < n_bufs_per_seg; j++) - { - prev_b0 = chain_b0; - len_to_deq0 = clib_min (*left_to_snd0, deq_per_buf); - - *n_bufs -= 1; - chain_bi0 = smm->tx_buffers[thread_index][*n_bufs]; - _vec_len (smm->tx_buffers[thread_index]) = *n_bufs; - - chain_b0 = vlib_get_buffer (vm, chain_bi0); - chain_b0->current_data = 0; - data0 = vlib_buffer_get_current (chain_b0); - if (peek_data) - { - n_bytes_read = svm_fifo_peek (fifo, *rx_offset, len_to_deq0, data0); - *rx_offset += n_bytes_read; - } - else - { - n_bytes_read = svm_fifo_dequeue_nowait (fifo, len_to_deq0, data0); - } - ASSERT (n_bytes_read == len_to_deq0); - chain_b0->current_length = n_bytes_read; - b0->total_length_not_including_first_buffer += chain_b0->current_length; - - /* update previous buffer */ - prev_b0->next_buffer = chain_bi0; - prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT; - - /* update current buffer */ - chain_b0->next_buffer = 0; - - *left_to_snd0 -= n_bytes_read; - if (*left_to_snd0 == 0) - break; - } -} - -always_inline int -session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node, - session_manager_main_t * smm, - session_fifo_event_t * e0, - stream_session_t * s0, u32 thread_index, - int *n_tx_packets, u8 peek_data) -{ - u32 n_trace = vlib_get_trace_count (vm, node); - u32 left_to_snd0, max_len_to_snd0, len_to_deq0, snd_space0; - u32 n_bufs_per_evt, n_frames_per_evt; - transport_connection_t *tc0; - transport_proto_vft_t *transport_vft; - u32 next_index, next0, *to_next, n_left_to_next, bi0; - vlib_buffer_t *b0; - u32 rx_offset = 0, max_dequeue0, n_bytes_per_seg; - u16 snd_mss0, n_bufs_per_seg, n_bufs; - u8 *data0; - int i, n_bytes_read; - u32 n_bytes_per_buf, deq_per_buf; - u32 buffers_allocated, buffers_allocated_this_call; - - next_index = next0 = session_type_to_next[s0->session_type]; - - transport_vft = session_get_transport_vft (s0->session_type); - tc0 = transport_vft->get_connection (s0->connection_index, thread_index); - - /* Make sure we have space to send and there's something to dequeue */ - snd_mss0 = transport_vft->send_mss (tc0); - snd_space0 = transport_vft->send_space (tc0); - - /* Can't make any progress */ - if (snd_space0 == 0 || snd_mss0 == 0) - { - vec_add1 (smm->pending_event_vector[thread_index], *e0); - return 0; - } - - if (peek_data) - { - /* Offset in rx fifo from where to peek data */ - rx_offset = transport_vft->tx_fifo_offset (tc0); - } - - /* Check how much we can pull. If buffering, subtract the offset */ - max_dequeue0 = svm_fifo_max_dequeue (s0->server_tx_fifo) - rx_offset; - - /* Nothing to read return */ - if (max_dequeue0 == 0) - { - svm_fifo_unset_event (s0->server_tx_fifo); - return 0; - } - - /* Ensure we're not writing more than transport window allows */ - if (max_dequeue0 < snd_space0) - { - /* Constrained by tx queue. Try to send only fully formed segments */ - max_len_to_snd0 = (max_dequeue0 > snd_mss0) ? - max_dequeue0 - max_dequeue0 % snd_mss0 : max_dequeue0; - /* TODO Nagle ? */ - } - else - { - max_len_to_snd0 = snd_space0; - } - - n_bytes_per_buf = vlib_buffer_free_list_buffer_size - (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); - n_bytes_per_seg = MAX_HDRS_LEN + snd_mss0; - n_bufs_per_seg = ceil ((double) n_bytes_per_seg / n_bytes_per_buf); - n_bufs_per_evt = (ceil ((double) max_len_to_snd0 / n_bytes_per_seg)) - * n_bufs_per_seg; - n_frames_per_evt = ceil ((double) n_bufs_per_evt / VLIB_FRAME_SIZE); - - deq_per_buf = clib_min (snd_mss0, n_bytes_per_buf); - - n_bufs = vec_len (smm->tx_buffers[thread_index]); - left_to_snd0 = max_len_to_snd0; - for (i = 0; i < n_frames_per_evt; i++) - { - /* Make sure we have at least one full frame of buffers ready */ - if (PREDICT_FALSE (n_bufs < VLIB_FRAME_SIZE)) - { - vec_validate (smm->tx_buffers[thread_index], - n_bufs + 2 * VLIB_FRAME_SIZE - 1); - - buffers_allocated = 0; - do - { - buffers_allocated_this_call = - vlib_buffer_alloc - (vm, - &smm->tx_buffers[thread_index][n_bufs + buffers_allocated], - 2 * VLIB_FRAME_SIZE - buffers_allocated); - buffers_allocated += buffers_allocated_this_call; - } - while (buffers_allocated_this_call > 0 - && ((buffers_allocated + n_bufs < VLIB_FRAME_SIZE))); - - n_bufs += buffers_allocated; - - _vec_len (smm->tx_buffers[thread_index]) = n_bufs; - - if (PREDICT_FALSE (n_bufs < VLIB_FRAME_SIZE)) - { - vec_add1 (smm->pending_event_vector[thread_index], *e0); - return -1; - } - } - /* Allow enqueuing of a new event */ - svm_fifo_unset_event (s0->server_tx_fifo); - - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); - while (left_to_snd0 && n_left_to_next >= n_bufs_per_seg) - { - /* - * Handle first buffer in chain separately - */ - - /* Get free buffer */ - ASSERT (n_bufs >= 1); - bi0 = smm->tx_buffers[thread_index][--n_bufs]; - ASSERT (bi0); - _vec_len (smm->tx_buffers[thread_index]) = n_bufs; - - /* usual speculation, or the enqueue_x1 macro will barf */ - to_next[0] = bi0; - to_next += 1; - n_left_to_next -= 1; - - b0 = vlib_get_buffer (vm, bi0); - b0->error = 0; - b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID - | VNET_BUFFER_F_LOCALLY_ORIGINATED; - b0->current_data = 0; - b0->total_length_not_including_first_buffer = 0; - - len_to_deq0 = clib_min (left_to_snd0, deq_per_buf); - - data0 = vlib_buffer_make_headroom (b0, MAX_HDRS_LEN); - if (peek_data) - { - n_bytes_read = svm_fifo_peek (s0->server_tx_fifo, rx_offset, - len_to_deq0, data0); - /* Keep track of progress locally, transport is also supposed to - * increment it independently when pushing the header */ - rx_offset += n_bytes_read; - } - else - { - n_bytes_read = svm_fifo_dequeue_nowait (s0->server_tx_fifo, - len_to_deq0, data0); - } - - if (n_bytes_read <= 0) - goto dequeue_fail; - - b0->current_length = n_bytes_read; - - left_to_snd0 -= n_bytes_read; - *n_tx_packets = *n_tx_packets + 1; - - /* - * Fill in the remaining buffers in the chain, if any - */ - if (PREDICT_FALSE (n_bufs_per_seg > 1)) - session_tx_fifo_chain_tail (smm, vm, thread_index, - s0->server_tx_fifo, b0, bi0, - n_bufs_per_seg, &left_to_snd0, - &n_bufs, &rx_offset, deq_per_buf, - peek_data); - - /* Ask transport to push header after current_length and - * total_length_not_including_first_buffer are updated */ - transport_vft->push_header (tc0, b0); - - /* *INDENT-OFF* */ - SESSION_EVT_DBG(SESSION_EVT_DEQ, s0, ({ - ed->data[0] = e0->event_id; - ed->data[1] = max_dequeue0; - ed->data[2] = len_to_deq0; - ed->data[3] = left_to_snd0; - })); - /* *INDENT-ON* */ - - - VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0); - if (PREDICT_FALSE (n_trace > 0)) - { - session_queue_trace_t *t0; - vlib_trace_buffer (vm, node, next_index, b0, - 1 /* follow_chain */ ); - vlib_set_trace_count (vm, node, --n_trace); - t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); - t0->session_index = s0->session_index; - t0->server_thread_index = s0->thread_index; - } - - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, - to_next, n_left_to_next, - bi0, next0); - } - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } - - /* If we couldn't dequeue all bytes mark as partially read */ - if (max_len_to_snd0 < max_dequeue0) - { - /* If we don't already have new event */ - if (svm_fifo_set_event (s0->server_tx_fifo)) - { - vec_add1 (smm->pending_event_vector[thread_index], *e0); - } - } - return 0; - -dequeue_fail: - /* - * Can't read from fifo. If we don't already have an event, save as partially - * read, return buff to free list and return - */ - clib_warning ("dequeue fail"); - - if (svm_fifo_set_event (s0->server_tx_fifo)) - { - vec_add1 (smm->pending_event_vector[thread_index], *e0); - } - vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1); - _vec_len (smm->tx_buffers[thread_index]) += 1; - - return 0; -} - -int -session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node, - session_manager_main_t * smm, - session_fifo_event_t * e0, - stream_session_t * s0, u32 thread_index, - int *n_tx_pkts) -{ - return session_tx_fifo_read_and_snd_i (vm, node, smm, e0, s0, thread_index, - n_tx_pkts, 1); -} - -int -session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node, - session_manager_main_t * smm, - session_fifo_event_t * e0, - stream_session_t * s0, u32 thread_index, - int *n_tx_pkts) -{ - return session_tx_fifo_read_and_snd_i (vm, node, smm, e0, s0, thread_index, - n_tx_pkts, 0); -} - -always_inline stream_session_t * -session_event_get_session (session_fifo_event_t * e, u8 thread_index) -{ - ASSERT (e->fifo->master_thread_index == thread_index); - return stream_session_get_if_valid (e->fifo->master_session_index, - thread_index); -} - -void -dump_thread_0_event_queue (void) -{ - session_manager_main_t *smm = vnet_get_session_manager_main (); - vlib_main_t *vm = &vlib_global_main; - u32 my_thread_index = vm->thread_index; - session_fifo_event_t _e, *e = &_e; - stream_session_t *s0; - int i, index; - i8 *headp; - - unix_shared_memory_queue_t *q; - q = smm->vpp_event_queues[my_thread_index]; - - index = q->head; - - for (i = 0; i < q->cursize; i++) - { - headp = (i8 *) (&q->data[0] + q->elsize * index); - clib_memcpy (e, headp, q->elsize); - - switch (e->event_type) - { - case FIFO_EVENT_APP_TX: - s0 = session_event_get_session (e, my_thread_index); - fformat (stdout, "[%04d] TX session %d\n", i, s0->session_index); - break; - - case FIFO_EVENT_DISCONNECT: - s0 = stream_session_get_from_handle (e->session_handle); - fformat (stdout, "[%04d] disconnect session %d\n", i, - s0->session_index); - break; - - case FIFO_EVENT_BUILTIN_RX: - s0 = session_event_get_session (e, my_thread_index); - fformat (stdout, "[%04d] builtin_rx %d\n", i, s0->session_index); - break; - - case FIFO_EVENT_RPC: - fformat (stdout, "[%04d] RPC call %llx with %llx\n", - i, (u64) (e->rpc_args.fp), (u64) (e->rpc_args.arg)); - break; - - default: - fformat (stdout, "[%04d] unhandled event type %d\n", - i, e->event_type); - break; - } - - index++; - - if (index == q->maxsize) - index = 0; - } -} - -static u8 -session_node_cmp_event (session_fifo_event_t * e, svm_fifo_t * f) -{ - stream_session_t *s; - switch (e->event_type) - { - case FIFO_EVENT_APP_RX: - case FIFO_EVENT_APP_TX: - case FIFO_EVENT_BUILTIN_RX: - if (e->fifo == f) - return 1; - break; - case FIFO_EVENT_DISCONNECT: - break; - case FIFO_EVENT_RPC: - s = stream_session_get_from_handle (e->session_handle); - if (!s) - { - clib_warning ("session has event but doesn't exist!"); - break; - } - if (s->server_rx_fifo == f || s->server_tx_fifo == f) - return 1; - break; - default: - break; - } - return 0; -} - -u8 -session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e) -{ - session_manager_main_t *smm = vnet_get_session_manager_main (); - unix_shared_memory_queue_t *q; - session_fifo_event_t *pending_event_vector, *evt; - int i, index, found = 0; - i8 *headp; - u8 thread_index; - - ASSERT (e); - thread_index = f->master_thread_index; - /* - * Search evt queue - */ - q = smm->vpp_event_queues[thread_index]; - index = q->head; - for (i = 0; i < q->cursize; i++) - { - headp = (i8 *) (&q->data[0] + q->elsize * index); - clib_memcpy (e, headp, q->elsize); - found = session_node_cmp_event (e, f); - if (found) - break; - if (++index == q->maxsize) - index = 0; - } - /* - * Search pending events vector - */ - pending_event_vector = smm->pending_event_vector[thread_index]; - vec_foreach (evt, pending_event_vector) - { - found = session_node_cmp_event (evt, f); - if (found) - { - clib_memcpy (e, evt, sizeof (*evt)); - break; - } - } - return found; -} - -static uword -session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - session_manager_main_t *smm = vnet_get_session_manager_main (); - session_fifo_event_t *my_pending_event_vector, *e; - session_fifo_event_t *my_fifo_events; - u32 n_to_dequeue, n_events; - unix_shared_memory_queue_t *q; - application_t *app; - int n_tx_packets = 0; - u32 my_thread_index = vm->thread_index; - int i, rv; - f64 now = vlib_time_now (vm); - void (*fp) (void *); - - SESSION_EVT_DBG (SESSION_EVT_POLL_GAP_TRACK, smm, my_thread_index); - - /* - * Update TCP time - */ - tcp_update_time (now, my_thread_index); - - /* - * Get vpp queue events - */ - q = smm->vpp_event_queues[my_thread_index]; - if (PREDICT_FALSE (q == 0)) - return 0; - - my_fifo_events = smm->free_event_vector[my_thread_index]; - - /* min number of events we can dequeue without blocking */ - n_to_dequeue = q->cursize; - my_pending_event_vector = smm->pending_event_vector[my_thread_index]; - - if (n_to_dequeue == 0 && vec_len (my_pending_event_vector) == 0) - return 0; - - SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 0); - - /* - * If we didn't manage to process previous events try going - * over them again without dequeuing new ones. - */ - /* XXX: Block senders to sessions that can't keep up */ - if (0 && vec_len (my_pending_event_vector) >= 100) - { - clib_warning ("too many fifo events unsolved"); - goto skip_dequeue; - } - - /* See you in the next life, don't be late */ - if (pthread_mutex_trylock (&q->mutex)) - return 0; - - for (i = 0; i < n_to_dequeue; i++) - { - vec_add2 (my_fifo_events, e, 1); - unix_shared_memory_queue_sub_raw (q, (u8 *) e); - } - - /* The other side of the connection is not polling */ - if (q->cursize < (q->maxsize / 8)) - (void) pthread_cond_broadcast (&q->condvar); - pthread_mutex_unlock (&q->mutex); - - vec_append (my_fifo_events, my_pending_event_vector); - - _vec_len (my_pending_event_vector) = 0; - smm->pending_event_vector[my_thread_index] = my_pending_event_vector; - -skip_dequeue: - n_events = vec_len (my_fifo_events); - for (i = 0; i < n_events; i++) - { - stream_session_t *s0; /* $$$ prefetch 1 ahead maybe */ - session_fifo_event_t *e0; - - e0 = &my_fifo_events[i]; - - switch (e0->event_type) - { - case FIFO_EVENT_APP_TX: - s0 = session_event_get_session (e0, my_thread_index); - - if (CLIB_DEBUG && !s0) - { - clib_warning ("It's dead, Jim!"); - continue; - } - - if (PREDICT_FALSE (s0->session_state == SESSION_STATE_CLOSED)) - continue; - /* Spray packets in per session type frames, since they go to - * different nodes */ - rv = (smm->session_tx_fns[s0->session_type]) (vm, node, smm, e0, s0, - my_thread_index, - &n_tx_packets); - /* Out of buffers */ - if (PREDICT_FALSE (rv < 0)) - { - vlib_node_increment_counter (vm, node->node_index, - SESSION_QUEUE_ERROR_NO_BUFFER, 1); - continue; - } - break; - case FIFO_EVENT_DISCONNECT: - s0 = stream_session_get_from_handle (e0->session_handle); - stream_session_disconnect (s0); - break; - case FIFO_EVENT_BUILTIN_RX: - s0 = session_event_get_session (e0, my_thread_index); - svm_fifo_unset_event (s0->server_rx_fifo); - app = application_get (s0->app_index); - app->cb_fns.builtin_server_rx_callback (s0); - break; - case FIFO_EVENT_RPC: - fp = e0->rpc_args.fp; - (*fp) (e0->rpc_args.arg); - break; - - default: - clib_warning ("unhandled event type %d", e0->event_type); - } - } - - _vec_len (my_fifo_events) = 0; - smm->free_event_vector[my_thread_index] = my_fifo_events; - - vlib_node_increment_counter (vm, session_queue_node.index, - SESSION_QUEUE_ERROR_TX, n_tx_packets); - - SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 1); - - return n_tx_packets; -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (session_queue_node) = -{ - .function = session_queue_node_fn, - .name = "session-queue", - .format_trace = format_session_queue_trace, - .type = VLIB_NODE_TYPE_INPUT, - .n_errors = ARRAY_LEN (session_queue_error_strings), - .error_strings = session_queue_error_strings, - .n_next_nodes = SESSION_QUEUE_N_NEXT, - .state = VLIB_NODE_STATE_DISABLED, - .next_nodes = - { - [SESSION_QUEUE_NEXT_DROP] = "error-drop", - [SESSION_QUEUE_NEXT_IP4_LOOKUP] = "ip4-lookup", - [SESSION_QUEUE_NEXT_IP6_LOOKUP] = "ip6-lookup", - [SESSION_QUEUE_NEXT_TCP_IP4_OUTPUT] = "tcp4-output", - [SESSION_QUEUE_NEXT_TCP_IP6_OUTPUT] = "tcp6-output", - }, -}; -/* *INDENT-ON* */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ -- cgit 1.2.3-korg