vpp - Vector Packet Processing

Age	Commit message (Expand)	Author	Files	Lines
2016-09-21	Refactor pre-Doxy siphon scripts; VPP-396	Chris Luke	1	-0/+74

/* * Copyright (c) 2017-2019 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #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/application_interface.h> #include <vnet/session/application_local.h> #include <vnet/session/session_debug.h> #include <svm/queue.h> static void session_mq_accepted_reply_handler (void *data); static void accepted_notify_cb (void *data, u32 data_len) { session_mq_accepted_reply_handler (data); } static void session_mq_accepted_reply_handler (void *data) { session_accepted_reply_msg_t *mp = (session_accepted_reply_msg_t *) data; vnet_disconnect_args_t _a = { 0 }, *a = &_a; session_state_t old_state; app_worker_t *app_wrk; session_t *s; /* Server isn't interested, kill the session */ if (mp->retval) { a->app_index = mp->context; a->handle = mp->handle; vnet_disconnect_session (a); return; } /* Mail this back from the main thread. We're not polling in main * thread so we're using other workers for notifications. */ if (vlib_num_workers () && vlib_get_thread_index () != 0 && session_thread_from_handle (mp->handle) == 0) { vl_api_rpc_call_main_thread (accepted_notify_cb, data, sizeof (session_accepted_reply_msg_t)); return; } s = session_get_from_handle_if_valid (mp->handle); if (!s) return; app_wrk = app_worker_get (s->app_wrk_index); if (app_wrk->app_index != mp->context) { clib_warning ("app doesn't own session"); return; } if (!session_has_transport (s)) { s->session_state = SESSION_STATE_READY; if (ct_session_connect_notify (s)) return; } else { old_state = s->session_state; s->session_state = SESSION_STATE_READY; if (!svm_fifo_is_empty_prod (s->rx_fifo)) app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX); /* Closed while waiting for app to reply. Resend disconnect */ if (old_state >= SESSION_STATE_TRANSPORT_CLOSING) { app_worker_close_notify (app_wrk, s); s->session_state = old_state; return; } } } static void session_mq_reset_reply_handler (void *data) { vnet_disconnect_args_t _a = { 0 }, *a = &_a; session_reset_reply_msg_t *mp; app_worker_t *app_wrk; session_t *s; application_t *app; u32 index, thread_index; mp = (session_reset_reply_msg_t *) data; app = application_lookup (mp->context); if (!app) return; session_parse_handle (mp->handle, &index, &thread_index); s = session_get_if_valid (index, thread_index); /* Session was already closed or already cleaned up */ if (!s || s->session_state != SESSION_STATE_TRANSPORT_CLOSING) return; app_wrk = app_worker_get (s->app_wrk_index); if (!app_wrk || app_wrk->app_index != app->app_index) { clib_warning ("App % does not own handle 0x%lx!", app->app_index, mp->handle); return; } /* Client objected to resetting the session, log and continue */ if (mp->retval) { clib_warning ("client retval %d", mp->retval); return; } /* This comes as a response to a reset, transport only waiting for * confirmation to remove connection state, no need to disconnect */ a->handle = mp->handle; a->app_index = app->app_index; vnet_disconnect_session (a); } static void session_mq_disconnected_handler (void *data) { session_disconnected_reply_msg_t *rmp; vnet_disconnect_args_t _a, *a = &_a; svm_msg_q_msg_t _msg, *msg = &_msg; session_disconnected_msg_t *mp; app_worker_t *app_wrk; session_event_t *evt; session_t *s; application_t *app; int rv = 0; mp = (session_disconnected_msg_t *) data; if (!(s = session_get_from_handle_if_valid (mp->handle))) { clib_warning ("could not disconnect handle %llu", mp->handle); return; } app_wrk = app_worker_get (s->app_wrk_index); app = application_lookup (mp->client_index); if (!(app_wrk && app && app->app_index == app_wrk->app_index)) { clib_warning ("could not disconnect session: %llu app: %u", mp->handle, mp->client_index); return; } a->handle = mp->handle; a->app_index = app_wrk->wrk_index; rv = vnet_disconnect_session (a); svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg); evt = svm_msg_q_msg_data (app_wrk->event_queue, msg); clib_memset (evt, 0, sizeof (*evt)); evt->event_type = SESSION_CTRL_EVT_DISCONNECTED_REPLY; rmp = (session_disconnected_reply_msg_t *) evt->data; rmp->handle = mp->handle; rmp->context = mp->context; rmp->retval = rv; svm_msg_q_add_and_unlock (app_wrk->event_queue, msg); } static void session_mq_disconnected_reply_handler (void *data) { session_disconnected_reply_msg_t *mp; vnet_disconnect_args_t _a, *a = &_a; application_t *app; mp = (session_disconnected_reply_msg_t *) data; /* Client objected to disconnecting the session, log and continue */ if (mp->retval) { clib_warning ("client retval %d", mp->retval); return; } /* Disconnect has been confirmed. Confirm close to transport */ app = application_lookup (mp->context); if (app) { a->handle = mp->handle; a->app_index = app->app_index; vnet_disconnect_session (a); } } static void session_mq_worker_update_handler (void *data) { session_worker_update_msg_t *mp = (session_worker_update_msg_t *) data; session_worker_update_reply_msg_t *rmp; svm_msg_q_msg_t _msg, *msg = &_msg; app_worker_t *app_wrk; u32 owner_app_wrk_map; session_event_t *evt; session_t *s; application_t *app; app = application_lookup (mp->client_index); if (!app) return; if (!(s = session_get_from_handle_if_valid (mp->handle))) { clib_warning ("invalid handle %llu", mp->handle); return; } app_wrk = app_worker_get (s->app_wrk_index); if (app_wrk->app_index != app->app_index) { clib_warning ("app %u does not own session %llu", app->app_index, mp->handle); return; } owner_app_wrk_map = app_wrk->wrk_map_index; app_wrk = application_get_worker (app, mp->wrk_index); /* This needs to come from the new owner */ if (mp->req_wrk_index == owner_app_wrk_map) { session_req_worker_update_msg_t *wump; svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg); evt = svm_msg_q_msg_data (app_wrk->event_queue, msg); clib_memset (evt, 0, sizeof (*evt)); evt->event_type = SESSION_CTRL_EVT_REQ_WORKER_UPDATE; wump = (session_req_worker_update_msg_t *) evt->data; wump->session_handle = mp->handle; svm_msg_q_add_and_unlock (app_wrk->event_queue, msg); return; } app_worker_own_session (app_wrk, s); /* * Send reply */ svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg); evt = svm_msg_q_msg_data (app_wrk->event_queue, msg); clib_memset (evt, 0, sizeof (*evt)); evt->event_type = SESSION_CTRL_EVT_WORKER_UPDATE_REPLY; rmp = (session_worker_update_reply_msg_t *) evt->data; rmp->handle = mp->handle; rmp->rx_fifo = pointer_to_uword (s->rx_fifo); rmp->tx_fifo = pointer_to_uword (s->tx_fifo); rmp->segment_handle = session_segment_handle (s); svm_msg_q_add_and_unlock (app_wrk->event_queue, msg); /* * Retransmit messages that may have been lost */ if (s->tx_fifo && !svm_fifo_is_empty (s->tx_fifo)) session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX); if (s->rx_fifo && !svm_fifo_is_empty (s->rx_fifo)) app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX); if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING) app_worker_close_notify (app_wrk, s); } 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; } #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 _ }; enum { SESSION_TX_NO_BUFFERS = -2, SESSION_TX_NO_DATA, SESSION_TX_OK }; static void session_tx_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, u32 next_index, u32 * to_next, u16 n_segs, session_t * s, u32 n_trace) { session_queue_trace_t *t; vlib_buffer_t *b; int i; for (i = 0; i < clib_min (n_trace, n_segs); i++) { b = vlib_get_buffer (vm, to_next[i - n_segs]); vlib_trace_buffer (vm, node, next_index, b, 1 /* follow_chain */ ); t = vlib_add_trace (vm, node, b, sizeof (*t)); t->session_index = s->session_index; t->server_thread_index = s->thread_index; } vlib_set_trace_count (vm, node, n_trace - i); } 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) { vlib_buffer_t *chain_b, *prev_b; u32 chain_bi0, to_deq, left_from_seg; session_worker_t *wrk; u16 len_to_deq, n_bytes_read; u8 *data, j; wrk = session_main_get_worker (ctx->s->thread_index); 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 = wrk->tx_buffers[*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->tx_fifo, ctx->tx_offset, len_to_deq, data); ctx->tx_offset += n_bytes_read; } else { if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM) { svm_fifo_t *f = ctx->s->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) { u32 offset = hdr->data_length + SESSION_CONN_HDR_LEN; svm_fifo_dequeue_drop (f, offset); } } else n_bytes_read = svm_fifo_dequeue (ctx->s->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 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; data0 = vlib_buffer_make_headroom (b, TRANSPORT_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->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->transport_options.tx_type == TRANSPORT_TX_DGRAM) { session_dgram_hdr_t *hdr = &ctx->hdr; svm_fifo_t *f = ctx->s->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 (ctx->s->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); } always_inline u8 session_tx_not_ready (session_t * s, u8 peek_data) { if (peek_data) { if (PREDICT_TRUE (s->session_state == SESSION_STATE_READY)) return 0; /* Can retransmit for closed sessions but can't send new data if * session is not ready or closed */ else if (s->session_state < SESSION_STATE_READY) return 1; else if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED) { /* Allow closed transports to still send custom packets. * For instance, tcp may want to send acks in time-wait. */ if (s->session_state != SESSION_STATE_TRANSPORT_DELETED && (s->flags & SESSION_F_CUSTOM_TX)) return 0; return 2; } } 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, u32 max_segs, u8 peek_data) { u32 n_bytes_per_buf, n_bytes_per_seg; ctx->max_dequeue = svm_fifo_max_dequeue_cons (ctx->s->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->transport_options.tx_type == TRANSPORT_TX_DGRAM) { if (ctx->max_dequeue <= sizeof (ctx->hdr)) { ctx->max_len_to_snd = 0; return; } svm_fifo_peek (ctx->s->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; } /* Check if we're tx constrained by the node */ ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->snd_mss); if (ctx->n_segs_per_evt > max_segs) { ctx->n_segs_per_evt = max_segs; ctx->max_len_to_snd = max_segs * ctx->snd_mss; } n_bytes_per_buf = vlib_buffer_get_default_data_size (vm); ASSERT (n_bytes_per_buf > TRANSPORT_MAX_HDRS_LEN); n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->snd_mss; ctx->n_bufs_per_seg = ceil ((f64) 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 - TRANSPORT_MAX_HDRS_LEN); } always_inline int session_tx_fifo_read_and_snd_i (session_worker_t * wrk, vlib_node_runtime_t * node, session_evt_elt_t * elt, int *n_tx_packets, u8 peek_data) { u32 next_index, next0, next1, *to_next, n_left_to_next, max_burst; u32 n_trace, n_bufs_needed = 0, n_left, pbi; session_tx_context_t *ctx = &wrk->ctx; session_main_t *smm = &session_main; session_event_t *e = &elt->evt; vlib_main_t *vm = wrk->vm; transport_proto_t tp; vlib_buffer_t *pb; u16 n_bufs, rv; if (PREDICT_FALSE ((rv = session_tx_not_ready (ctx->s, peek_data)))) { if (rv < 2) session_evt_add_old (wrk, elt); return SESSION_TX_NO_DATA; } next_index = smm->session_type_to_next[ctx->s->session_type]; next0 = next1 = next_index; max_burst = VLIB_FRAME_SIZE - *n_tx_packets; tp = session_get_transport_proto (ctx->s); ctx->transport_vft = transport_protocol_get_vft (tp); ctx->tc = session_tx_get_transport (ctx, peek_data); if (PREDICT_FALSE (e->event_type == SESSION_IO_EVT_TX_FLUSH)) { if (ctx->transport_vft->flush_data) ctx->transport_vft->flush_data (ctx->tc); } if (ctx->s->flags & SESSION_F_CUSTOM_TX) { u32 n_custom_tx; ctx->s->flags &= ~SESSION_F_CUSTOM_TX; n_custom_tx = ctx->transport_vft->custom_tx (ctx->tc, max_burst); *n_tx_packets += n_custom_tx; if (PREDICT_FALSE (ctx->s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)) return SESSION_TX_OK; max_burst -= n_custom_tx; if (!max_burst) { session_evt_add_old (wrk, elt); return SESSION_TX_OK; } } ctx->snd_mss = ctx->transport_vft->send_mss (ctx->tc); ctx->snd_space = transport_connection_snd_space (ctx->tc, vm->clib_time. last_cpu_time, ctx->snd_mss); if (ctx->snd_space == 0 || ctx->snd_mss == 0) { session_evt_add_old (wrk, elt); return SESSION_TX_NO_DATA; } /* Allow enqueuing of a new event */ svm_fifo_unset_event (ctx->s->tx_fifo); /* Check how much we can pull. */ session_tx_set_dequeue_params (vm, ctx, max_burst, peek_data); if (PREDICT_FALSE (!ctx->max_len_to_snd)) return SESSION_TX_NO_DATA; n_bufs_needed = ctx->n_segs_per_evt * ctx->n_bufs_per_seg; vec_validate_aligned (wrk->tx_buffers, n_bufs_needed - 1, CLIB_CACHE_LINE_BYTES); n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_needed); if (PREDICT_FALSE (n_bufs < n_bufs_needed)) { if (n_bufs) vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); session_evt_add_old (wrk, elt); vlib_node_increment_counter (wrk->vm, node->node_index, SESSION_QUEUE_ERROR_NO_BUFFER, 1); return SESSION_TX_NO_BUFFERS; } /* * Write until we fill up a frame */ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); if (PREDICT_FALSE (ctx->n_segs_per_evt > n_left_to_next)) { ctx->n_segs_per_evt = n_left_to_next; ctx->max_len_to_snd = ctx->snd_mss * n_left_to_next; } ctx->left_to_snd = ctx->max_len_to_snd; n_left = ctx->n_segs_per_evt; while (n_left >= 4) { vlib_buffer_t *b0, *b1; u32 bi0, bi1; pbi = wrk->tx_buffers[n_bufs - 3]; pb = vlib_get_buffer (vm, pbi); vlib_prefetch_buffer_header (pb, STORE); pbi = wrk->tx_buffers[n_bufs - 4]; pb = vlib_get_buffer (vm, pbi); vlib_prefetch_buffer_header (pb, STORE); to_next[0] = bi0 = wrk->tx_buffers[--n_bufs]; to_next[1] = bi1 = wrk->tx_buffers[--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_left -= 2; VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0); VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1); vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } while (n_left) { vlib_buffer_t *b0; u32 bi0; if (n_left > 1) { pbi = wrk->tx_buffers[n_bufs - 2]; pb = vlib_get_buffer (vm, pbi); vlib_prefetch_buffer_header (pb, STORE); } to_next[0] = bi0 = wrk->tx_buffers[--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_left -= 1; VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0); vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node)) > 0)) session_tx_trace_frame (vm, node, next_index, to_next, ctx->n_segs_per_evt, ctx->s, n_trace); if (PREDICT_FALSE (n_bufs)) vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); *n_tx_packets += ctx->n_segs_per_evt; transport_connection_update_tx_bytes (ctx->tc, ctx->max_len_to_snd); vlib_put_next_frame (vm, node, next_index, n_left_to_next); SESSION_EVT (SESSION_EVT_DEQ, ctx->s, ctx->max_len_to_snd, ctx->max_dequeue, ctx->s->tx_fifo->has_event, wrk->last_vlib_time); /* If we couldn't dequeue all bytes mark as partially read */ ASSERT (ctx->left_to_snd == 0); if (ctx->max_len_to_snd < ctx->max_dequeue) if (svm_fifo_set_event (ctx->s->tx_fifo)) session_evt_add_old (wrk, elt); if (!peek_data && ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM) { /* Fix dgram pre header */ if (ctx->max_len_to_snd < ctx->max_dequeue) svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr, sizeof (session_dgram_pre_hdr_t)); /* More data needs to be read */ else if (svm_fifo_max_dequeue_cons (ctx->s->tx_fifo) > 0) if (svm_fifo_set_event (ctx->s->tx_fifo)) session_evt_add_old (wrk, elt); if (svm_fifo_needs_deq_ntf (ctx->s->tx_fifo, ctx->max_len_to_snd)) session_dequeue_notify (ctx->s); } return SESSION_TX_OK; } int session_tx_fifo_peek_and_snd (session_worker_t * wrk, vlib_node_runtime_t * node, session_evt_elt_t * e, int *n_tx_packets) { return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 1); } int session_tx_fifo_dequeue_and_snd (session_worker_t * wrk, vlib_node_runtime_t * node, session_evt_elt_t * e, int *n_tx_packets) { return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 0); } int session_tx_fifo_dequeue_internal (session_worker_t * wrk, vlib_node_runtime_t * node, session_evt_elt_t * e, int *n_tx_packets) { session_t *s = wrk->ctx.s; if (PREDICT_FALSE (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)) return 0; svm_fifo_unset_event (s->tx_fifo); return transport_custom_tx (session_get_transport_proto (s), s, VLIB_FRAME_SIZE - *n_tx_packets); } always_inline session_t * session_event_get_session (session_event_t * e, u8 thread_index) { return session_get_if_valid (e->session_index, thread_index); } always_inline void session_event_dispatch (session_worker_t * wrk, vlib_node_runtime_t * node, session_evt_elt_t * elt, u32 thread_index, int *n_tx_packets) { session_main_t *smm = &session_main; app_worker_t *app_wrk; clib_llist_index_t ei; void (*fp) (void *); session_event_t *e; session_t *s; ei = clib_llist_entry_index (wrk->event_elts, elt); e = &elt->evt; switch (e->event_type) { case SESSION_IO_EVT_TX_FLUSH: case SESSION_IO_EVT_TX: s = session_event_get_session (e, thread_index); if (PREDICT_FALSE (!s)) { clib_warning ("session %u was freed!", e->session_index); break; } CLIB_PREFETCH (s->tx_fifo, 2 * CLIB_CACHE_LINE_BYTES, LOAD); wrk->ctx.s = s; /* Spray packets in per session type frames, since they go to * different nodes */ (smm->session_tx_fns[s->session_type]) (wrk, node, elt, n_tx_packets); break; case SESSION_IO_EVT_RX: s = session_event_get_session (e, thread_index); if (!s) break; transport_app_rx_evt (session_get_transport_proto (s), s->connection_index, s->thread_index); break; case SESSION_CTRL_EVT_CLOSE: s = session_get_from_handle_if_valid (e->session_handle); if (PREDICT_FALSE (!s)) break; session_transport_close (s); break; case SESSION_IO_EVT_BUILTIN_RX: s = session_event_get_session (e, thread_index); if (PREDICT_FALSE (!s || s->session_state >= SESSION_STATE_CLOSING)) break; svm_fifo_unset_event (s->rx_fifo); app_wrk = app_worker_get (s->app_wrk_index); app_worker_builtin_rx (app_wrk, s); break; case SESSION_IO_EVT_BUILTIN_TX: s = session_get_from_handle_if_valid (e->session_handle); wrk->ctx.s = s; if (PREDICT_TRUE (s != 0)) session_tx_fifo_dequeue_internal (wrk, node, elt, n_tx_packets); break; case SESSION_CTRL_EVT_RPC: fp = e->rpc_args.fp; (*fp) (e->rpc_args.arg); break; case SESSION_CTRL_EVT_DISCONNECTED: session_mq_disconnected_handler (e->data); break; case SESSION_CTRL_EVT_ACCEPTED_REPLY: session_mq_accepted_reply_handler (e->data); break; case SESSION_CTRL_EVT_CONNECTED_REPLY: break; case SESSION_CTRL_EVT_DISCONNECTED_REPLY: session_mq_disconnected_reply_handler (e->data); break; case SESSION_CTRL_EVT_RESET_REPLY: session_mq_reset_reply_handler (e->data); break; case SESSION_CTRL_EVT_WORKER_UPDATE: session_mq_worker_update_handler (e->data); break; default: clib_warning ("unhandled event type %d", e->event_type); } /* Regrab elements in case pool moved */ elt = pool_elt_at_index (wrk->event_elts, ei); if (!clib_llist_elt_is_linked (elt, evt_list)) session_evt_elt_free (wrk, elt); } static uword session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { session_main_t *smm = vnet_get_session_main (); u32 thread_index = vm->thread_index, n_to_dequeue; session_worker_t *wrk = &smm->wrk[thread_index]; session_evt_elt_t *elt, *ctrl_he, *new_he, *old_he; svm_msg_q_msg_t _msg, *msg = &_msg; clib_llist_index_t old_ti; int i, n_tx_packets = 0; session_event_t *evt; svm_msg_q_t *mq; SESSION_EVT (SESSION_EVT_DISPATCH_START, wrk); wrk->last_vlib_time = vlib_time_now (vm); /* * Update transport time */ transport_update_time (wrk->last_vlib_time, thread_index); /* * Dequeue and handle new events */ /* Try to dequeue what is available. Don't wait for lock. * XXX: we may need priorities here */ mq = wrk->vpp_event_queue; n_to_dequeue = svm_msg_q_size (mq); if (n_to_dequeue && svm_msg_q_try_lock (mq) == 0) { for (i = 0; i < n_to_dequeue; i++) { svm_msg_q_sub_w_lock (mq, msg); evt = svm_msg_q_msg_data (mq, msg); if (evt->event_type > SESSION_IO_EVT_BUILTIN_TX) elt = session_evt_alloc_ctrl (wrk); else elt = session_evt_alloc_new (wrk); /* Works because reply messages are smaller than a session evt. * If we ever need to support bigger messages this needs to be * fixed */ clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt)); svm_msg_q_free_msg (mq, msg); } svm_msg_q_unlock (mq); } /* * Handle control events */ ctrl_he = pool_elt_at_index (wrk->event_elts, wrk->ctrl_head); /* *INDENT-OFF* */ clib_llist_foreach_safe (wrk->event_elts, evt_list, ctrl_he, elt, ({ clib_llist_remove (wrk->event_elts, evt_list, elt); session_event_dispatch (wrk, node, elt, thread_index, &n_tx_packets); })); /* *INDENT-ON* */ /* * Handle the new io events. */ new_he = pool_elt_at_index (wrk->event_elts, wrk->new_head); /* *INDENT-OFF* */ clib_llist_foreach_safe (wrk->event_elts, evt_list, new_he, elt, ({ session_evt_type_t et; et = elt->evt.event_type; clib_llist_remove (wrk->event_elts, evt_list, elt); /* Postpone tx events if we can't handle them this dispatch cycle */ if (n_tx_packets >= VLIB_FRAME_SIZE && (et == SESSION_IO_EVT_TX || et == SESSION_IO_EVT_TX_FLUSH)) { clib_llist_add (wrk->event_elts, evt_list, elt, new_he); continue; } session_event_dispatch (wrk, node, elt, thread_index, &n_tx_packets); })); /* *INDENT-ON* */ /* * Handle the old io events */ old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head); old_ti = clib_llist_prev_index (old_he, evt_list); while (!clib_llist_is_empty (wrk->event_elts, evt_list, old_he)) { clib_llist_index_t ei; clib_llist_pop_first (wrk->event_elts, evt_list, elt, old_he); ei = clib_llist_entry_index (wrk->event_elts, elt); session_event_dispatch (wrk, node, elt, thread_index, &n_tx_packets); old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head); if (n_tx_packets >= VLIB_FRAME_SIZE || ei == old_ti) break; }; vlib_node_increment_counter (vm, session_queue_node.index, SESSION_QUEUE_ERROR_TX, n_tx_packets); SESSION_EVT (SESSION_EVT_DISPATCH_END, wrk, n_tx_packets); 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* */ void dump_thread_0_event_queue (void) { session_main_t *smm = vnet_get_session_main (); vlib_main_t *vm = &vlib_global_main; u32 my_thread_index = vm->thread_index; session_event_t _e, *e = &_e; svm_msg_q_ring_t *ring; session_t *s0; svm_msg_q_msg_t *msg; svm_msg_q_t *mq; int i, index; mq = smm->wrk[my_thread_index].vpp_event_queue; index = mq->q->head; for (i = 0; i < mq->q->cursize; i++) { msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index); ring = svm_msg_q_ring (mq, msg->ring_index); clib_memcpy_fast (e, svm_msg_q_msg_data (mq, msg), ring->elsize); switch (e->event_type) { case SESSION_IO_EVT_TX: s0 = session_event_get_session (e, my_thread_index); fformat (stdout, "[%04d] TX session %d\n", i, s0->session_index); break; case SESSION_CTRL_EVT_CLOSE: s0 = session_get_from_handle (e->session_handle); fformat (stdout, "[%04d] disconnect session %d\n", i, s0->session_index); break; case SESSION_IO_EVT_BUILTIN_RX: s0 = session_event_get_session (e, my_thread_index); fformat (stdout, "[%04d] builtin_rx %d\n", i, s0->session_index); break; case SESSION_CTRL_EVT_RPC: fformat (stdout, "[%04d] RPC call %llx with %llx\n", i, (u64) (uword) (e->rpc_args.fp), (u64) (uword) (e->rpc_args.arg)); break; default: fformat (stdout, "[%04d] unhandled event type %d\n", i, e->event_type); break; } index++; if (index == mq->q->maxsize) index = 0; } } static u8 session_node_cmp_event (session_event_t * e, svm_fifo_t * f) { session_t *s; switch (e->event_type) { case SESSION_IO_EVT_RX: case SESSION_IO_EVT_TX: case SESSION_IO_EVT_BUILTIN_RX: if (e->session_index == f->master_session_index) return 1; break; case SESSION_CTRL_EVT_CLOSE: break; case SESSION_CTRL_EVT_RPC: s = session_get_from_handle (e->session_handle); if (!s) { clib_warning ("session has event but doesn't exist!"); break; } if (s->rx_fifo == f || s->tx_fifo == f) return 1; break; default: break; } return 0; } u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e) { session_evt_elt_t *elt; session_worker_t *wrk; int i, index, found = 0; svm_msg_q_msg_t *msg; svm_msg_q_ring_t *ring; svm_msg_q_t *mq; u8 thread_index; ASSERT (e); thread_index = f->master_thread_index; wrk = session_main_get_worker (thread_index); /* * Search evt queue */ mq = wrk->vpp_event_queue; index = mq->q->head; for (i = 0; i < mq->q->cursize; i++) { msg = (svm_msg_q_msg_t *) (&mq->q->data[0] + mq->q->elsize * index); ring = svm_msg_q_ring (mq, msg->ring_index); clib_memcpy_fast (e, svm_msg_q_msg_data (mq, msg), ring->elsize); found = session_node_cmp_event (e, f); if (found) return 1; if (++index == mq->q->maxsize) index = 0; } /* * Search pending events vector */ /* *INDENT-OFF* */ clib_llist_foreach (wrk->event_elts, evt_list, pool_elt_at_index (wrk->event_elts, wrk->old_head), elt, ({ found = session_node_cmp_event (&elt->evt, f); if (found) { clib_memcpy_fast (e, &elt->evt, sizeof (*e)); break; } })); /* *INDENT-ON* */ return found; } 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); static uword session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f) { f64 now, timeout = 1.0; uword *event_data = 0; uword event_type; while (1) { vlib_process_wait_for_event_or_clock (vm, timeout); now = vlib_time_now (vm); event_type = vlib_process_get_events (vm, (uword **) & event_data); switch (event_type) { case SESSION_Q_PROCESS_FLUSH_FRAMES: /* Flush the frames by updating all transports times */ transport_update_time (now, 0); break; case SESSION_Q_PROCESS_STOP: timeout = 100000.0; break; case ~0: /* Timed out. Update time for all transports to trigger all * outstanding retransmits. */ transport_update_time (now, 0); break; } vec_reset_length (event_data); } return 0; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (session_queue_process_node) = { .function = session_queue_process, .type = VLIB_NODE_TYPE_PROCESS, .name = "session-queue-process", .state = VLIB_NODE_STATE_DISABLED, }; /* *INDENT-ON* */ static_always_inline uword session_queue_pre_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { session_main_t *sm = &session_main; if (!sm->wrk[0].vpp_event_queue) return 0; return session_queue_node_fn (vm, node, frame); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (session_queue_pre_input_node) = { .function = session_queue_pre_input_inline, .type = VLIB_NODE_TYPE_PRE_INPUT, .name = "session-queue-main", .state = VLIB_NODE_STATE_DISABLED, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */