/* * 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 <math.h> #include <vlib/vlib.h> #include <vnet/vnet.h> #include <vppinfra/elog.h> #include <vnet/session/transport.h> #include <vnet/session/session.h> #include <vnet/session/application.h> #include <vnet/session/session_debug.h> #include <svm/queue.h> 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 _ }; always_inline void session_tx_trace_buffer (vlib_main_t * vm, vlib_node_runtime_t * node, u32 next_index, vlib_buffer_t * b, stream_session_t * s, u32 * n_trace) { session_queue_trace_t *t; vlib_trace_buffer (vm, node, next_index, b, 1 /* follow_chain */ ); vlib_set_trace_count (vm, node, --*n_trace); t = vlib_add_trace (vm, node, b, sizeof (*t)); t->session_index = s->session_index; t->server_thread_index = s->thread_index; } always_inline void session_tx_fifo_chain_tail (vlib_main_t * vm, session_tx_context_t * ctx, vlib_buffer_t * b, u16 * n_bufs, u8 peek_data) { session_manager_main_t *smm = &session_manager_main; vlib_buffer_t *chain_b, *prev_b; u32 chain_bi0, to_deq, left_from_seg; u16 len_to_deq, n_bytes_read; u8 *data, j; b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; b->total_length_not_including_first_buffer = 0; chain_b = b; left_from_seg = clib_min (ctx->snd_mss - b->current_length, ctx->left_to_snd); to_deq = left_from_seg; for (j = 1; j < ctx->n_bufs_per_seg; j++) { prev_b = chain_b; len_to_deq = clib_min (to_deq, ctx->deq_per_buf); *n_bufs -= 1; chain_bi0 = smm->tx_buffers[ctx->s->thread_index][*n_bufs]; _vec_len (smm->tx_buffers[ctx->s->thread_index]) = *n_bufs; chain_b = vlib_get_buffer (vm, chain_bi0); chain_b->current_data = 0; data = vlib_buffer_get_current (chain_b); if (peek_data) { n_bytes_read = svm_fifo_peek (ctx->s->server_tx_fifo, ctx->tx_offset, len_to_deq, data); ctx->tx_offset += n_bytes_read; } else { if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM) { svm_fifo_t *f = ctx->s->server_tx_fifo; session_dgram_hdr_t *hdr = &ctx->hdr; u16 deq_now; deq_now = clib_min (hdr->data_length - hdr->data_offset, len_to_deq); n_bytes_read = svm_fifo_peek (f, hdr->data_offset, deq_now, data); ASSERT (n_bytes_read > 0); hdr->data_offset += n_bytes_read; if (hdr->data_offset == hdr->data_length) svm_fifo_dequeue_drop (f, hdr->data_length); } else n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->server_tx_fifo, len_to_deq, data); } ASSERT (n_bytes_read == len_to_deq); chain_b->current_length = n_bytes_read; b->total_length_not_including_first_buffer += chain_b->current_length; /* update previous buffer */ prev_b->next_buffer = chain_bi0; prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT; /* update current buffer */ chain_b->next_buffer = 0; to_deq -= n_bytes_read; if (to_deq == 0) break; } ASSERT (to_deq == 0 && b->total_length_not_including_first_buffer == left_from_seg); ctx->left_to_snd -= left_from_seg; } always_inline int session_output_try_get_buffers (vlib_main_t * vm, session_manager_main_t * smm, u32 thread_index, u16 * n_bufs, u32 wanted) { u32 bufs_alloc = 0, bufs_now; vec_validate_aligned (smm->tx_buffers[thread_index], *n_bufs + wanted - 1, CLIB_CACHE_LINE_BYTES); do { bufs_now = vlib_buffer_alloc (vm, &smm->tx_buffers[thread_index][*n_bufs + bufs_alloc], wanted - bufs_alloc); bufs_alloc += bufs_now; } while (bufs_now > 0 && ((bufs_alloc + *n_bufs < wanted))); *n_bufs += bufs_alloc; _vec_len (smm->tx_buffers[thread_index]) = *n_bufs; return bufs_alloc; } always_inline void session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx, vlib_buffer_t * b, u16 * n_bufs, u8 peek_data) { u32 len_to_deq; u8 *data0; int n_bytes_read; /* * Start with the first buffer in chain */ b->error = 0; b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED; b->current_data = 0; b->total_length_not_including_first_buffer = 0; data0 = vlib_buffer_make_headroom (b, MAX_HDRS_LEN); len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf); if (peek_data) { n_bytes_read = svm_fifo_peek (ctx->s->server_tx_fifo, ctx->tx_offset, len_to_deq, data0); ASSERT (n_bytes_read > 0); /* Keep track of progress locally, transport is also supposed to * increment it independently when pushing the header */ ctx->tx_offset += n_bytes_read; } else { if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM) { session_dgram_hdr_t *hdr = &ctx->hdr; svm_fifo_t *f = ctx->s->server_tx_fifo; u16 deq_now; u32 offset; ASSERT (hdr->data_length > hdr->data_offset); deq_now = clib_min (hdr->data_length - hdr->data_offset, len_to_deq); offset = hdr->data_offset + SESSION_CONN_HDR_LEN; n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0); ASSERT (n_bytes_read > 0); if (ctx->s->session_state == SESSION_STATE_LISTENING) { ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4); ctx->tc->rmt_port = hdr->rmt_port; } hdr->data_offset += n_bytes_read; if (hdr->data_offset == hdr->data_length) { offset = hdr->data_length + SESSION_CONN_HDR_LEN; svm_fifo_dequeue_drop (f, offset); } } else { n_bytes_read = svm_fifo_dequeue_nowait (ctx->s->server_tx_fifo, len_to_deq, data0); ASSERT (n_bytes_read > 0); } } b->current_length = n_bytes_read; ctx->left_to_snd -= n_bytes_read; /* * Fill in the remaining buffers in the chain, if any */ if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd)) session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data); /* *INDENT-OFF* */ SESSION_EVT_DBG(SESSION_EVT_DEQ, s, ({ ed->data[0] = e->event_type; ed->data[1] = max_dequeue; ed->data[2] = len_to_deq; ed->data[3] = left_to_snd; })); /* *INDENT-ON* */ } always_inline u8 session_tx_not_ready (stream_session_t * s, u8 peek_data) { if (peek_data) { /* Can retransmit for closed sessions but can't send new data if * session is not ready or closed */ if (s->session_state < SESSION_STATE_READY) return 1; } return 0; } always_inline transport_connection_t * session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data) { if (peek_data) { return ctx->transport_vft->get_connection (ctx->s->connection_index, ctx->s->thread_index); } else { if (ctx->s->session_state == SESSION_STATE_LISTENING) return ctx->transport_vft->get_listener (ctx->s->connection_index); else { return ctx->transport_vft->get_connection (ctx->s->connection_index, ctx->s->thread_index); } } } always_inline void session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx, u8 peek_data) { u32 n_bytes_per_buf, n_bytes_per_seg; ctx->max_dequeue = svm_fifo_max_dequeue (ctx->s->server_tx_fifo); if (peek_data) { /* Offset in rx fifo from where to peek data */ ctx->tx_offset = ctx->transport_vft->tx_fifo_offset (ctx->tc); if (PREDICT_FALSE (ctx->tx_offset >= ctx->max_dequeue)) { ctx->max_len_to_snd = 0; return; } ctx->max_dequeue -= ctx->tx_offset; } else { if (ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM) { if (ctx->max_dequeue <= sizeof (ctx->hdr)) { ctx->max_len_to_snd = 0; return; } svm_fifo_peek (ctx->s->server_tx_fifo, 0, sizeof (ctx->hdr), (u8 *) & ctx->hdr); ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset); ctx->max_dequeue = ctx->hdr.data_length - ctx->hdr.data_offset; } } ASSERT (ctx->max_dequeue > 0); /* Ensure we're not writing more than transport window allows */ if (ctx->max_dequeue < ctx->snd_space) { /* Constrained by tx queue. Try to send only fully formed segments */ ctx->max_len_to_snd = (ctx->max_dequeue > ctx->snd_mss) ? ctx->max_dequeue - ctx->max_dequeue % ctx->snd_mss : ctx->max_dequeue; /* TODO Nagle ? */ } else { /* Expectation is that snd_space0 is already a multiple of snd_mss */ ctx->max_len_to_snd = ctx->snd_space; } n_bytes_per_buf = vlib_buffer_free_list_buffer_size (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); ASSERT (n_bytes_per_buf > MAX_HDRS_LEN); n_bytes_per_seg = MAX_HDRS_LEN + ctx->snd_mss; ctx->n_bufs_per_seg = ceil ((double) n_bytes_per_seg / n_bytes_per_buf); ctx->deq_per_buf = clib_min (ctx->snd_mss, n_bytes_per_buf); ctx->deq_per_first_buf = clib_min (ctx->snd_mss, n_bytes_per_buf - MAX_HDRS_LEN); } always_inline int session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node, session_fifo_event_t * e, stream_session_t * s, int *n_tx_packets, u8 peek_data) { u32 next_index, next0, next1, next2, next3, *to_next, n_left_to_next; u32 n_trace = vlib_get_trace_count (vm, node), n_packets = 0, pbi; u32 n_bufs_per_frame, thread_index = s->thread_index; session_manager_main_t *smm = &session_manager_main; session_tx_context_t *ctx = &smm->ctx[thread_index]; transport_proto_t tp; vlib_buffer_t *pb; u16 n_bufs; if (PREDICT_FALSE (session_tx_not_ready (s, peek_data))) { vec_add1 (smm->pending_event_vector[thread_index], *e); return 0; } next_index = smm->session_type_to_next[s->session_type]; next0 = next1 = next2 = next3 = next_index; tp = session_get_transport_proto (s); ctx->s = s; ctx->transport_vft = transport_protocol_get_vft (tp); ctx->tc = session_tx_get_transport (ctx, peek_data); ctx->snd_mss = ctx->transport_vft->send_mss (ctx->tc); ctx->snd_space = ctx->transport_vft->send_space (ctx->tc); if (ctx->snd_space == 0 || ctx->snd_mss == 0) { vec_add1 (smm->pending_event_vector[thread_index], *e); return 0; } /* Allow enqueuing of a new event */ svm_fifo_unset_event (s->server_tx_fifo); /* Check how much we can pull. */ session_tx_set_dequeue_params (vm, ctx, peek_data); if (PREDICT_FALSE (!ctx->max_len_to_snd)) return 0; n_bufs = vec_len (smm->tx_buffers[thread_index]); ctx->left_to_snd = ctx->max_len_to_snd; /* * Make sure we have at least one full frame of buffers ready */ n_bufs_per_frame = ctx->n_bufs_per_seg * VLIB_FRAME_SIZE; if (n_bufs < n_bufs_per_frame) { session_output_try_get_buffers (vm, smm, thread_index, &n_bufs, n_bufs_per_frame); if (PREDICT_FALSE (n_bufs < n_bufs_per_frame)) { vec_add1 (smm->pending_event_vector[thread_index], *e); return -1; } } /* * Write until we fill up a frame */ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (ctx->left_to_snd && n_left_to_next) { while (ctx->left_to_snd > 3 * ctx->snd_mss && n_left_to_next >= 4) { vlib_buffer_t *b0, *b1; u32 bi0, bi1; pbi = smm->tx_buffers[thread_index][n_bufs - 3]; pb = vlib_get_buffer (vm, pbi); vlib_prefetch_buffer_header (pb, STORE); pbi = smm->tx_buffers[thread_index][n_bufs - 4]; pb = vlib_get_buffer (vm, pbi); vlib_prefetch_buffer_header (pb, STORE); to_next[0] = bi0 = smm->tx_buffers[thread_index][--n_bufs]; to_next[1] = bi1 = smm->tx_buffers[thread_index][--n_bufs]; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data); session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data); ctx->transport_vft->push_header (ctx->tc, b0); ctx->transport_vft->push_header (ctx->tc, b1); to_next += 2; n_left_to_next -= 2; n_packets += 2; VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0); VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1); if (PREDICT_FALSE (n_trace > 0)) { session_tx_trace_buffer (vm, node, next_index, b0, s, &n_trace); if (n_trace) session_tx_trace_buffer (vm, node, next_index, b1, s, &n_trace); } vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } while (ctx->left_to_snd && n_left_to_next) { vlib_buffer_t *b0; u32 bi0; ASSERT (n_bufs >= 1); to_next[0] = bi0 = smm->tx_buffers[thread_index][--n_bufs]; b0 = vlib_get_buffer (vm, bi0); session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data); /* Ask transport to push header after current_length and * total_length_not_including_first_buffer are updated */ ctx->transport_vft->push_header (ctx->tc, b0); to_next += 1; n_left_to_next -= 1; n_packets += 1; VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0); if (PREDICT_FALSE (n_trace > 0)) session_tx_trace_buffer (vm, node, next_index, b0, s, &n_trace); vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } } _vec_len (smm->tx_buffers[thread_index]) = n_bufs; *n_tx_packets += n_packets; vlib_put_next_frame (vm, node, next_index, n_left_to_next); /* If we couldn't dequeue all bytes mark as partially read */ if (ctx->max_len_to_snd < ctx->max_dequeue) if (svm_fifo_set_event (s->server_tx_fifo)) vec_add1 (smm->pending_event_vector[thread_index], *e); if (!peek_data && ctx->transport_vft->tx_type == TRANSPORT_TX_DGRAM) { /* Fix dgram pre header */ if (ctx->max_len_to_snd < ctx->max_dequeue) svm_fifo_overwrite_head (s->server_tx_fifo, (u8 *) & ctx->hdr, sizeof (session_dgram_pre_hdr_t)); /* More data needs to be read */ else if (svm_fifo_max_dequeue (s->server_tx_fifo) > 0) if (svm_fifo_set_event (s->server_tx_fifo)) vec_add1 (smm->pending_event_vector[thread_index], *e); } return 0; } int session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node, session_fifo_event_t * e0, stream_session_t * s0, int *n_tx_pkts) { return session_tx_fifo_read_and_snd_i (vm, node, e0, s0, n_tx_pkts, 1); } int session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node, session_fifo_event_t * e0, stream_session_t * s0, int *n_tx_pkts) { return session_tx_fifo_read_and_snd_i (vm, node, e0, s0, n_tx_pkts, 0); } int session_tx_fifo_dequeue_internal (vlib_main_t * vm, vlib_node_runtime_t * node, session_fifo_event_t * e0, stream_session_t * s0, int *n_tx_pkts) { application_t *app; app = application_get (s0->opaque); svm_fifo_unset_event (s0->server_tx_fifo); return app->cb_fns.builtin_app_tx_callback (s0); } always_inline stream_session_t * session_event_get_session (session_fifo_event_t * e, u8 thread_index) { return 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; svm_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 = 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 = 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 (); svm_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) return 1; 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, *pending_disconnects, *e; session_fifo_event_t *my_fifo_events; u32 n_to_dequeue, n_events; svm_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 transport time */ transport_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]; pending_disconnects = smm->pending_disconnects[my_thread_index]; if (!n_to_dequeue && !vec_len (my_pending_event_vector) && !vec_len (pending_disconnects)) 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); svm_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_append (my_fifo_events, smm->pending_disconnects[my_thread_index]); _vec_len (my_pending_event_vector) = 0; smm->pending_event_vector[my_thread_index] = my_pending_event_vector; _vec_len (smm->pending_disconnects[my_thread_index]) = 0; 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 (PREDICT_FALSE (!s0)) { clib_warning ("It's dead, Jim!"); continue; } /* Spray packets in per session type frames, since they go to * different nodes */ rv = (smm->session_tx_fns[s0->session_type]) (vm, node, e0, s0, &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: /* Make sure disconnects run after the pending list is drained */ s0 = session_get_from_handle (e0->session_handle); if (!e0->postponed || svm_fifo_max_dequeue (s0->server_tx_fifo)) { e0->postponed = 1; vec_add1 (smm->pending_disconnects[my_thread_index], *e0); continue; } stream_session_disconnect_transport (s0); break; case FIFO_EVENT_BUILTIN_RX: s0 = session_event_get_session (e0, my_thread_index); if (PREDICT_FALSE (!s0)) continue; svm_fifo_unset_event (s0->server_rx_fifo); app = application_get (s0->app_index); app->cb_fns.builtin_app_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, .state = VLIB_NODE_STATE_DISABLED, }; /* *INDENT-ON* */ static clib_error_t * session_queue_exit (vlib_main_t * vm) { if (vec_len (vlib_mains) < 2) return 0; /* * Shut off (especially) worker-thread session nodes. * Otherwise, vpp can crash as the main thread unmaps the * API segment. */ vlib_worker_thread_barrier_sync (vm); session_node_enable_disable (0 /* is_enable */ ); vlib_worker_thread_barrier_release (vm); return 0; } VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */