2 * Copyright (c) 2017-2019 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
17 #include <vlib/vlib.h>
18 #include <vnet/vnet.h>
19 #include <vppinfra/elog.h>
20 #include <vnet/session/transport.h>
21 #include <vnet/session/session.h>
22 #include <vnet/session/application.h>
23 #include <vnet/session/application_interface.h>
24 #include <vnet/session/application_local.h>
25 #include <vnet/session/session_debug.h>
26 #include <svm/queue.h>
28 #define app_check_thread_and_barrier(_fn, _arg) \
29 if (!vlib_thread_is_main_w_barrier ()) \
31 vlib_rpc_call_main_thread (_fn, (u8 *) _arg, sizeof(*_arg)); \
36 session_mq_listen_handler (void *data)
38 session_listen_msg_t *mp = (session_listen_msg_t *) data;
39 vnet_listen_args_t _a, *a = &_a;
40 app_worker_t *app_wrk;
44 app_check_thread_and_barrier (session_mq_listen_handler, mp);
46 app = application_lookup (mp->client_index);
50 clib_memset (a, 0, sizeof (*a));
51 a->sep.is_ip4 = mp->is_ip4;
52 ip_copy (&a->sep.ip, &mp->ip, mp->is_ip4);
53 a->sep.port = mp->port;
54 a->sep.fib_index = mp->vrf;
55 a->sep.sw_if_index = ENDPOINT_INVALID_INDEX;
56 a->sep.transport_proto = mp->proto;
57 a->sep_ext.ckpair_index = mp->ckpair_index;
58 a->sep_ext.crypto_engine = mp->crypto_engine;
59 a->app_index = app->app_index;
60 a->wrk_map_index = mp->wrk_index;
61 a->sep_ext.transport_flags = mp->flags;
63 if ((rv = vnet_listen (a)))
64 clib_warning ("listen returned: %U", format_session_error, rv);
66 app_wrk = application_get_worker (app, mp->wrk_index);
67 mq_send_session_bound_cb (app_wrk->wrk_index, mp->context, a->handle, rv);
72 session_mq_listen_uri_handler (void *data)
74 session_listen_uri_msg_t *mp = (session_listen_uri_msg_t *) data;
75 vnet_listen_args_t _a, *a = &_a;
76 app_worker_t *app_wrk;
80 app_check_thread_and_barrier (session_mq_listen_uri_handler, mp);
82 app = application_lookup (mp->client_index);
86 clib_memset (a, 0, sizeof (*a));
87 a->uri = (char *) mp->uri;
88 a->app_index = app->app_index;
89 rv = vnet_bind_uri (a);
91 app_wrk = application_get_worker (app, 0);
92 mq_send_session_bound_cb (app_wrk->wrk_index, mp->context, a->handle, rv);
96 session_mq_connect_handler (void *data)
98 session_connect_msg_t *mp = (session_connect_msg_t *) data;
99 vnet_connect_args_t _a, *a = &_a;
100 app_worker_t *app_wrk;
104 app_check_thread_and_barrier (session_mq_connect_handler, mp);
106 app = application_lookup (mp->client_index);
110 clib_memset (a, 0, sizeof (*a));
111 a->sep.is_ip4 = mp->is_ip4;
112 clib_memcpy_fast (&a->sep.ip, &mp->ip, sizeof (mp->ip));
113 a->sep.port = mp->port;
114 a->sep.transport_proto = mp->proto;
115 a->sep.peer.fib_index = mp->vrf;
116 clib_memcpy_fast (&a->sep.peer.ip, &mp->lcl_ip, sizeof (mp->lcl_ip));
119 ip46_address_mask_ip4 (&a->sep.ip);
120 ip46_address_mask_ip4 (&a->sep.peer.ip);
122 a->sep.peer.port = mp->lcl_port;
123 a->sep.peer.sw_if_index = ENDPOINT_INVALID_INDEX;
124 a->sep_ext.parent_handle = mp->parent_handle;
125 a->sep_ext.ckpair_index = mp->ckpair_index;
126 a->sep_ext.crypto_engine = mp->crypto_engine;
127 a->sep_ext.transport_flags = mp->flags;
128 if (mp->hostname_len)
130 vec_validate (a->sep_ext.hostname, mp->hostname_len - 1);
131 clib_memcpy_fast (a->sep_ext.hostname, mp->hostname, mp->hostname_len);
133 a->api_context = mp->context;
134 a->app_index = app->app_index;
135 a->wrk_map_index = mp->wrk_index;
137 if ((rv = vnet_connect (a)))
139 clib_warning ("connect returned: %U", format_session_error, rv);
140 app_wrk = application_get_worker (app, mp->wrk_index);
141 mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0, rv);
144 vec_free (a->sep_ext.hostname);
148 session_mq_connect_uri_handler (void *data)
150 session_connect_uri_msg_t *mp = (session_connect_uri_msg_t *) data;
151 vnet_connect_args_t _a, *a = &_a;
152 app_worker_t *app_wrk;
156 app_check_thread_and_barrier (session_mq_connect_uri_handler, mp);
158 app = application_lookup (mp->client_index);
162 clib_memset (a, 0, sizeof (*a));
163 a->uri = (char *) mp->uri;
164 a->api_context = mp->context;
165 a->app_index = app->app_index;
166 if ((rv = vnet_connect_uri (a)))
168 clib_warning ("connect_uri returned: %d", rv);
169 app_wrk = application_get_worker (app, 0 /* default wrk only */ );
170 mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0, rv);
175 session_mq_disconnect_handler (void *data)
177 session_disconnect_msg_t *mp = (session_disconnect_msg_t *) data;
178 vnet_disconnect_args_t _a, *a = &_a;
181 app = application_lookup (mp->client_index);
185 a->app_index = app->app_index;
186 a->handle = mp->handle;
187 vnet_disconnect_session (a);
191 app_mq_detach_handler (void *data)
193 session_app_detach_msg_t *mp = (session_app_detach_msg_t *) data;
194 vnet_app_detach_args_t _a, *a = &_a;
197 app_check_thread_and_barrier (app_mq_detach_handler, mp);
199 app = application_lookup (mp->client_index);
203 a->app_index = app->app_index;
204 a->api_client_index = mp->client_index;
205 vnet_application_detach (a);
209 session_mq_unlisten_handler (void *data)
211 session_unlisten_msg_t *mp = (session_unlisten_msg_t *) data;
212 vnet_unlisten_args_t _a, *a = &_a;
213 app_worker_t *app_wrk;
217 app_check_thread_and_barrier (session_mq_unlisten_handler, mp);
219 app = application_lookup (mp->client_index);
223 clib_memset (a, 0, sizeof (*a));
224 a->app_index = app->app_index;
225 a->handle = mp->handle;
226 a->wrk_map_index = mp->wrk_index;
227 if ((rv = vnet_unlisten (a)))
228 clib_warning ("unlisten returned: %d", rv);
230 app_wrk = application_get_worker (app, a->wrk_map_index);
234 mq_send_unlisten_reply (app_wrk, mp->handle, mp->context, rv);
238 session_mq_accepted_reply_handler (void *data)
240 session_accepted_reply_msg_t *mp = (session_accepted_reply_msg_t *) data;
241 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
242 session_state_t old_state;
243 app_worker_t *app_wrk;
246 /* Server isn't interested, kill the session */
249 a->app_index = mp->context;
250 a->handle = mp->handle;
251 vnet_disconnect_session (a);
255 /* Mail this back from the main thread. We're not polling in main
256 * thread so we're using other workers for notifications. */
257 if (vlib_num_workers () && vlib_get_thread_index () != 0
258 && session_thread_from_handle (mp->handle) == 0)
260 vlib_rpc_call_main_thread (session_mq_accepted_reply_handler,
261 (u8 *) mp, sizeof (*mp));
265 s = session_get_from_handle_if_valid (mp->handle);
269 app_wrk = app_worker_get (s->app_wrk_index);
270 if (app_wrk->app_index != mp->context)
272 clib_warning ("app doesn't own session");
276 if (!session_has_transport (s))
278 s->session_state = SESSION_STATE_READY;
279 if (ct_session_connect_notify (s))
284 old_state = s->session_state;
285 s->session_state = SESSION_STATE_READY;
287 if (!svm_fifo_is_empty_prod (s->rx_fifo))
288 app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
290 /* Closed while waiting for app to reply. Resend disconnect */
291 if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
293 app_worker_close_notify (app_wrk, s);
294 s->session_state = old_state;
301 session_mq_reset_reply_handler (void *data)
303 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
304 session_reset_reply_msg_t *mp;
305 app_worker_t *app_wrk;
308 u32 index, thread_index;
310 mp = (session_reset_reply_msg_t *) data;
311 app = application_lookup (mp->context);
315 session_parse_handle (mp->handle, &index, &thread_index);
316 s = session_get_if_valid (index, thread_index);
318 /* No session or not the right session */
319 if (!s || s->session_state < SESSION_STATE_TRANSPORT_CLOSING)
322 app_wrk = app_worker_get (s->app_wrk_index);
323 if (!app_wrk || app_wrk->app_index != app->app_index)
325 clib_warning ("App %u does not own handle 0x%lx!", app->app_index,
330 /* Client objected to resetting the session, log and continue */
333 clib_warning ("client retval %d", mp->retval);
337 /* This comes as a response to a reset, transport only waiting for
338 * confirmation to remove connection state, no need to disconnect */
339 a->handle = mp->handle;
340 a->app_index = app->app_index;
341 vnet_disconnect_session (a);
345 session_mq_disconnected_handler (void *data)
347 session_disconnected_reply_msg_t *rmp;
348 vnet_disconnect_args_t _a, *a = &_a;
349 svm_msg_q_msg_t _msg, *msg = &_msg;
350 session_disconnected_msg_t *mp;
351 app_worker_t *app_wrk;
352 session_event_t *evt;
357 mp = (session_disconnected_msg_t *) data;
358 if (!(s = session_get_from_handle_if_valid (mp->handle)))
360 clib_warning ("could not disconnect handle %llu", mp->handle);
363 app_wrk = app_worker_get (s->app_wrk_index);
364 app = application_lookup (mp->client_index);
365 if (!(app_wrk && app && app->app_index == app_wrk->app_index))
367 clib_warning ("could not disconnect session: %llu app: %u",
368 mp->handle, mp->client_index);
372 a->handle = mp->handle;
373 a->app_index = app_wrk->wrk_index;
374 rv = vnet_disconnect_session (a);
376 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
377 SESSION_MQ_CTRL_EVT_RING,
379 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
380 clib_memset (evt, 0, sizeof (*evt));
381 evt->event_type = SESSION_CTRL_EVT_DISCONNECTED_REPLY;
382 rmp = (session_disconnected_reply_msg_t *) evt->data;
383 rmp->handle = mp->handle;
384 rmp->context = mp->context;
386 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
390 session_mq_disconnected_reply_handler (void *data)
392 session_disconnected_reply_msg_t *mp;
393 vnet_disconnect_args_t _a, *a = &_a;
396 mp = (session_disconnected_reply_msg_t *) data;
398 /* Client objected to disconnecting the session, log and continue */
401 clib_warning ("client retval %d", mp->retval);
405 /* Disconnect has been confirmed. Confirm close to transport */
406 app = application_lookup (mp->context);
409 a->handle = mp->handle;
410 a->app_index = app->app_index;
411 vnet_disconnect_session (a);
416 session_mq_worker_update_handler (void *data)
418 session_worker_update_msg_t *mp = (session_worker_update_msg_t *) data;
419 session_worker_update_reply_msg_t *rmp;
420 svm_msg_q_msg_t _msg, *msg = &_msg;
421 app_worker_t *app_wrk;
422 u32 owner_app_wrk_map;
423 session_event_t *evt;
427 app = application_lookup (mp->client_index);
430 if (!(s = session_get_from_handle_if_valid (mp->handle)))
432 clib_warning ("invalid handle %llu", mp->handle);
435 app_wrk = app_worker_get (s->app_wrk_index);
436 if (app_wrk->app_index != app->app_index)
438 clib_warning ("app %u does not own session %llu", app->app_index,
442 owner_app_wrk_map = app_wrk->wrk_map_index;
443 app_wrk = application_get_worker (app, mp->wrk_index);
445 /* This needs to come from the new owner */
446 if (mp->req_wrk_index == owner_app_wrk_map)
448 session_req_worker_update_msg_t *wump;
450 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
451 SESSION_MQ_CTRL_EVT_RING,
453 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
454 clib_memset (evt, 0, sizeof (*evt));
455 evt->event_type = SESSION_CTRL_EVT_REQ_WORKER_UPDATE;
456 wump = (session_req_worker_update_msg_t *) evt->data;
457 wump->session_handle = mp->handle;
458 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
462 app_worker_own_session (app_wrk, s);
467 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
468 SESSION_MQ_CTRL_EVT_RING,
470 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
471 clib_memset (evt, 0, sizeof (*evt));
472 evt->event_type = SESSION_CTRL_EVT_WORKER_UPDATE_REPLY;
473 rmp = (session_worker_update_reply_msg_t *) evt->data;
474 rmp->handle = mp->handle;
476 rmp->rx_fifo = fifo_segment_fifo_offset (s->rx_fifo);
478 rmp->tx_fifo = fifo_segment_fifo_offset (s->tx_fifo);
479 rmp->segment_handle = session_segment_handle (s);
480 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
483 * Retransmit messages that may have been lost
485 if (s->tx_fifo && !svm_fifo_is_empty (s->tx_fifo))
486 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
488 if (s->rx_fifo && !svm_fifo_is_empty (s->rx_fifo))
489 app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
491 if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
492 app_worker_close_notify (app_wrk, s);
496 session_mq_app_wrk_rpc_handler (void *data)
498 session_app_wrk_rpc_msg_t *mp = (session_app_wrk_rpc_msg_t *) data;
499 svm_msg_q_msg_t _msg, *msg = &_msg;
500 session_app_wrk_rpc_msg_t *rmp;
501 app_worker_t *app_wrk;
502 session_event_t *evt;
505 app = application_lookup (mp->client_index);
509 app_wrk = application_get_worker (app, mp->wrk_index);
511 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
512 SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT,
514 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
515 clib_memset (evt, 0, sizeof (*evt));
516 evt->event_type = SESSION_CTRL_EVT_APP_WRK_RPC;
517 rmp = (session_app_wrk_rpc_msg_t *) evt->data;
518 clib_memcpy (rmp->data, mp->data, sizeof (mp->data));
519 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
522 vlib_node_registration_t session_queue_node;
527 u32 server_thread_index;
528 } session_queue_trace_t;
530 /* packet trace format function */
532 format_session_queue_trace (u8 * s, va_list * args)
534 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
535 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
536 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
538 s = format (s, "session index %d thread index %d",
539 t->session_index, t->server_thread_index);
543 #define foreach_session_queue_error \
544 _(TX, "Packets transmitted") \
545 _(TIMER, "Timer events") \
546 _(NO_BUFFER, "Out of buffers")
550 #define _(sym,str) SESSION_QUEUE_ERROR_##sym,
551 foreach_session_queue_error
553 SESSION_QUEUE_N_ERROR,
554 } session_queue_error_t;
556 static char *session_queue_error_strings[] = {
557 #define _(sym,string) string,
558 foreach_session_queue_error
564 SESSION_TX_NO_BUFFERS = -2,
570 session_tx_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
571 u32 next_index, u32 * to_next, u16 n_segs,
572 session_t * s, u32 n_trace)
574 while (n_trace && n_segs)
576 vlib_buffer_t *b = vlib_get_buffer (vm, to_next[0]);
579 (vm, node, next_index, b, 1 /* follow_chain */ )))
581 session_queue_trace_t *t =
582 vlib_add_trace (vm, node, b, sizeof (*t));
583 t->session_index = s->session_index;
584 t->server_thread_index = s->thread_index;
590 vlib_set_trace_count (vm, node, n_trace);
594 session_tx_fifo_chain_tail (vlib_main_t * vm, session_tx_context_t * ctx,
595 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
597 vlib_buffer_t *chain_b, *prev_b;
598 u32 chain_bi0, to_deq, left_from_seg;
599 session_worker_t *wrk;
600 u16 len_to_deq, n_bytes_read;
603 wrk = session_main_get_worker (ctx->s->thread_index);
604 b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
605 b->total_length_not_including_first_buffer = 0;
608 left_from_seg = clib_min (ctx->sp.snd_mss - b->current_length,
610 to_deq = left_from_seg;
611 for (j = 1; j < ctx->n_bufs_per_seg; j++)
614 len_to_deq = clib_min (to_deq, ctx->deq_per_buf);
617 chain_bi0 = wrk->tx_buffers[*n_bufs];
618 chain_b = vlib_get_buffer (vm, chain_bi0);
619 chain_b->current_data = 0;
620 data = vlib_buffer_get_current (chain_b);
623 n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo,
624 ctx->sp.tx_offset, len_to_deq, data);
625 ctx->sp.tx_offset += n_bytes_read;
629 if (ctx->transport_vft->transport_options.tx_type ==
632 svm_fifo_t *f = ctx->s->tx_fifo;
633 session_dgram_hdr_t *hdr = &ctx->hdr;
637 deq_now = clib_min (hdr->data_length - hdr->data_offset,
639 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
640 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data);
641 ASSERT (n_bytes_read > 0);
643 hdr->data_offset += n_bytes_read;
644 if (hdr->data_offset == hdr->data_length)
646 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
647 svm_fifo_dequeue_drop (f, offset);
648 if (ctx->left_to_snd > n_bytes_read)
649 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
652 else if (ctx->left_to_snd == n_bytes_read)
653 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
654 sizeof (session_dgram_pre_hdr_t));
657 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
660 ASSERT (n_bytes_read == len_to_deq);
661 chain_b->current_length = n_bytes_read;
662 b->total_length_not_including_first_buffer += chain_b->current_length;
664 /* update previous buffer */
665 prev_b->next_buffer = chain_bi0;
666 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
668 /* update current buffer */
669 chain_b->next_buffer = 0;
671 to_deq -= n_bytes_read;
676 && b->total_length_not_including_first_buffer == left_from_seg);
677 ctx->left_to_snd -= left_from_seg;
681 session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx,
682 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
689 * Start with the first buffer in chain
692 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
695 data0 = vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
696 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
700 n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo, ctx->sp.tx_offset,
702 ASSERT (n_bytes_read > 0);
703 /* Keep track of progress locally, transport is also supposed to
704 * increment it independently when pushing the header */
705 ctx->sp.tx_offset += n_bytes_read;
709 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
711 session_dgram_hdr_t *hdr = &ctx->hdr;
712 svm_fifo_t *f = ctx->s->tx_fifo;
716 ASSERT (hdr->data_length > hdr->data_offset);
717 deq_now = clib_min (hdr->data_length - hdr->data_offset,
719 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
720 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
721 ASSERT (n_bytes_read > 0);
723 if (ctx->s->session_state == SESSION_STATE_LISTENING)
725 ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4);
726 ctx->tc->rmt_port = hdr->rmt_port;
728 hdr->data_offset += n_bytes_read;
729 if (hdr->data_offset == hdr->data_length)
731 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
732 svm_fifo_dequeue_drop (f, offset);
733 if (ctx->left_to_snd > n_bytes_read)
734 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
737 else if (ctx->left_to_snd == n_bytes_read)
738 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
739 sizeof (session_dgram_pre_hdr_t));
743 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
745 ASSERT (n_bytes_read > 0);
748 b->current_length = n_bytes_read;
749 ctx->left_to_snd -= n_bytes_read;
752 * Fill in the remaining buffers in the chain, if any
754 if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
755 session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data);
759 session_tx_not_ready (session_t * s, u8 peek_data)
763 if (PREDICT_TRUE (s->session_state == SESSION_STATE_READY))
765 /* Can retransmit for closed sessions but can't send new data if
766 * session is not ready or closed */
767 else if (s->session_state < SESSION_STATE_READY)
769 else if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)
771 /* Allow closed transports to still send custom packets.
772 * For instance, tcp may want to send acks in time-wait. */
773 if (s->session_state != SESSION_STATE_TRANSPORT_DELETED
774 && (s->flags & SESSION_F_CUSTOM_TX))
782 always_inline transport_connection_t *
783 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
787 return ctx->transport_vft->get_connection (ctx->s->connection_index,
788 ctx->s->thread_index);
792 if (ctx->s->session_state == SESSION_STATE_LISTENING)
793 return ctx->transport_vft->get_listener (ctx->s->connection_index);
796 return ctx->transport_vft->get_connection (ctx->s->connection_index,
797 ctx->s->thread_index);
803 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
804 u32 max_segs, u8 peek_data)
806 u32 n_bytes_per_buf, n_bytes_per_seg;
808 n_bytes_per_buf = vlib_buffer_get_default_data_size (vm);
809 ctx->max_dequeue = svm_fifo_max_dequeue_cons (ctx->s->tx_fifo);
813 /* Offset in rx fifo from where to peek data */
814 if (PREDICT_FALSE (ctx->sp.tx_offset >= ctx->max_dequeue))
816 ctx->max_len_to_snd = 0;
819 ctx->max_dequeue -= ctx->sp.tx_offset;
823 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
825 u32 len, chain_limit;
827 if (ctx->max_dequeue <= sizeof (ctx->hdr))
829 ctx->max_len_to_snd = 0;
833 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
835 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
836 len = ctx->hdr.data_length - ctx->hdr.data_offset;
838 /* Process multiple dgrams if smaller than min (buf_space, mss).
839 * This avoids handling multiple dgrams if they require buffer
841 chain_limit = clib_min (n_bytes_per_buf - TRANSPORT_MAX_HDRS_LEN,
843 if (ctx->hdr.data_length <= chain_limit)
845 u32 first_dgram_len, dgram_len, offset, max_offset;
846 session_dgram_hdr_t hdr;
848 ctx->sp.snd_mss = clib_min (ctx->sp.snd_mss, len);
849 offset = ctx->hdr.data_length + sizeof (session_dgram_hdr_t);
850 first_dgram_len = len;
851 max_offset = clib_min (ctx->max_dequeue, 16 << 10);
853 while (offset < max_offset)
855 svm_fifo_peek (ctx->s->tx_fifo, offset, sizeof (ctx->hdr),
857 ASSERT (hdr.data_length > hdr.data_offset);
858 dgram_len = hdr.data_length - hdr.data_offset;
859 if (len + dgram_len > ctx->max_dequeue
860 || first_dgram_len != dgram_len)
863 offset += sizeof (hdr) + hdr.data_length;
867 ctx->max_dequeue = len;
870 ASSERT (ctx->max_dequeue > 0);
872 /* Ensure we're not writing more than transport window allows */
873 if (ctx->max_dequeue < ctx->sp.snd_space)
875 /* Constrained by tx queue. Try to send only fully formed segments */
876 ctx->max_len_to_snd = (ctx->max_dequeue > ctx->sp.snd_mss) ?
877 (ctx->max_dequeue - (ctx->max_dequeue % ctx->sp.snd_mss)) :
883 /* Expectation is that snd_space0 is already a multiple of snd_mss */
884 ctx->max_len_to_snd = ctx->sp.snd_space;
887 /* Check if we're tx constrained by the node */
888 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->sp.snd_mss);
889 if (ctx->n_segs_per_evt > max_segs)
891 ctx->n_segs_per_evt = max_segs;
892 ctx->max_len_to_snd = max_segs * ctx->sp.snd_mss;
895 ASSERT (n_bytes_per_buf > TRANSPORT_MAX_HDRS_LEN);
896 if (ctx->n_segs_per_evt > 1)
898 u32 n_bytes_last_seg, n_bufs_last_seg;
900 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->sp.snd_mss;
901 n_bytes_last_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd
902 - ((ctx->n_segs_per_evt - 1) * ctx->sp.snd_mss);
903 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
904 n_bufs_last_seg = ceil ((f64) n_bytes_last_seg / n_bytes_per_buf);
905 ctx->n_bufs_needed = ((ctx->n_segs_per_evt - 1) * ctx->n_bufs_per_seg)
910 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd;
911 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
912 ctx->n_bufs_needed = ctx->n_bufs_per_seg;
915 ctx->deq_per_buf = clib_min (ctx->sp.snd_mss, n_bytes_per_buf);
916 ctx->deq_per_first_buf = clib_min (ctx->sp.snd_mss,
918 TRANSPORT_MAX_HDRS_LEN);
922 session_tx_maybe_reschedule (session_worker_t * wrk,
923 session_tx_context_t * ctx,
924 session_evt_elt_t * elt)
926 session_t *s = ctx->s;
928 svm_fifo_unset_event (s->tx_fifo);
929 if (svm_fifo_max_dequeue_cons (s->tx_fifo) > ctx->sp.tx_offset)
930 if (svm_fifo_set_event (s->tx_fifo))
931 session_evt_add_head_old (wrk, elt);
935 session_tx_fifo_read_and_snd_i (session_worker_t * wrk,
936 vlib_node_runtime_t * node,
937 session_evt_elt_t * elt,
938 int *n_tx_packets, u8 peek_data)
940 u32 n_trace, n_left, pbi, next_index, max_burst;
941 session_tx_context_t *ctx = &wrk->ctx;
942 session_main_t *smm = &session_main;
943 session_event_t *e = &elt->evt;
944 vlib_main_t *vm = wrk->vm;
945 transport_proto_t tp;
949 if (PREDICT_FALSE ((rv = session_tx_not_ready (ctx->s, peek_data))))
952 session_evt_add_old (wrk, elt);
953 return SESSION_TX_NO_DATA;
956 next_index = smm->session_type_to_next[ctx->s->session_type];
957 max_burst = SESSION_NODE_FRAME_SIZE - *n_tx_packets;
959 tp = session_get_transport_proto (ctx->s);
960 ctx->transport_vft = transport_protocol_get_vft (tp);
961 ctx->tc = session_tx_get_transport (ctx, peek_data);
963 if (PREDICT_FALSE (e->event_type == SESSION_IO_EVT_TX_FLUSH))
965 if (ctx->transport_vft->flush_data)
966 ctx->transport_vft->flush_data (ctx->tc);
967 e->event_type = SESSION_IO_EVT_TX;
970 if (ctx->s->flags & SESSION_F_CUSTOM_TX)
973 ctx->s->flags &= ~SESSION_F_CUSTOM_TX;
974 ctx->sp.max_burst_size = max_burst;
975 n_custom_tx = ctx->transport_vft->custom_tx (ctx->tc, &ctx->sp);
976 *n_tx_packets += n_custom_tx;
978 (ctx->s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
979 return SESSION_TX_OK;
980 max_burst -= n_custom_tx;
981 if (!max_burst || (ctx->s->flags & SESSION_F_CUSTOM_TX))
983 session_evt_add_old (wrk, elt);
984 return SESSION_TX_OK;
988 transport_connection_snd_params (ctx->tc, &ctx->sp);
990 if (!ctx->sp.snd_space)
992 /* If the deschedule flag was set, remove session from scheduler.
993 * Transport is responsible for rescheduling this session. */
994 if (ctx->sp.flags & TRANSPORT_SND_F_DESCHED)
995 transport_connection_deschedule (ctx->tc);
996 /* Request to postpone the session, e.g., zero-wnd and transport
997 * is not currently probing */
998 else if (ctx->sp.flags & TRANSPORT_SND_F_POSTPONE)
999 session_evt_add_old (wrk, elt);
1000 /* This flow queue is "empty" so it should be re-evaluated before
1001 * the ones that have data to send. */
1003 session_evt_add_head_old (wrk, elt);
1005 return SESSION_TX_NO_DATA;
1008 if (transport_connection_is_tx_paced (ctx->tc))
1010 u32 snd_space = transport_connection_tx_pacer_burst (ctx->tc);
1011 if (snd_space < TRANSPORT_PACER_MIN_BURST)
1013 session_evt_add_head_old (wrk, elt);
1014 return SESSION_TX_NO_DATA;
1016 snd_space = clib_min (ctx->sp.snd_space, snd_space);
1017 ctx->sp.snd_space = snd_space >= ctx->sp.snd_mss ?
1018 snd_space - snd_space % ctx->sp.snd_mss : snd_space;
1021 /* Check how much we can pull. */
1022 session_tx_set_dequeue_params (vm, ctx, max_burst, peek_data);
1024 if (PREDICT_FALSE (!ctx->max_len_to_snd))
1026 transport_connection_tx_pacer_reset_bucket (ctx->tc, 0);
1027 session_tx_maybe_reschedule (wrk, ctx, elt);
1028 return SESSION_TX_NO_DATA;
1031 vec_validate_aligned (wrk->tx_buffers, ctx->n_bufs_needed - 1,
1032 CLIB_CACHE_LINE_BYTES);
1033 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, ctx->n_bufs_needed);
1034 if (PREDICT_FALSE (n_bufs < ctx->n_bufs_needed))
1037 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1038 session_evt_add_head_old (wrk, elt);
1039 vlib_node_increment_counter (wrk->vm, node->node_index,
1040 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
1041 return SESSION_TX_NO_BUFFERS;
1044 if (transport_connection_is_tx_paced (ctx->tc))
1045 transport_connection_tx_pacer_update_bytes (ctx->tc, ctx->max_len_to_snd);
1047 ctx->left_to_snd = ctx->max_len_to_snd;
1048 n_left = ctx->n_segs_per_evt;
1052 vlib_buffer_t *b0, *b1;
1055 pbi = wrk->tx_buffers[n_bufs - 3];
1056 pb = vlib_get_buffer (vm, pbi);
1057 vlib_prefetch_buffer_header (pb, STORE);
1058 pbi = wrk->tx_buffers[n_bufs - 4];
1059 pb = vlib_get_buffer (vm, pbi);
1060 vlib_prefetch_buffer_header (pb, STORE);
1062 bi0 = wrk->tx_buffers[--n_bufs];
1063 bi1 = wrk->tx_buffers[--n_bufs];
1065 b0 = vlib_get_buffer (vm, bi0);
1066 b1 = vlib_get_buffer (vm, bi1);
1068 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
1069 session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
1071 ctx->transport_vft->push_header (ctx->tc, b0);
1072 ctx->transport_vft->push_header (ctx->tc, b1);
1076 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1077 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
1079 vec_add1 (wrk->pending_tx_buffers, bi0);
1080 vec_add1 (wrk->pending_tx_buffers, bi1);
1081 vec_add1 (wrk->pending_tx_nexts, next_index);
1082 vec_add1 (wrk->pending_tx_nexts, next_index);
1091 pbi = wrk->tx_buffers[n_bufs - 2];
1092 pb = vlib_get_buffer (vm, pbi);
1093 vlib_prefetch_buffer_header (pb, STORE);
1096 bi0 = wrk->tx_buffers[--n_bufs];
1097 b0 = vlib_get_buffer (vm, bi0);
1098 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
1100 /* Ask transport to push header after current_length and
1101 * total_length_not_including_first_buffer are updated */
1102 ctx->transport_vft->push_header (ctx->tc, b0);
1106 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1108 vec_add1 (wrk->pending_tx_buffers, bi0);
1109 vec_add1 (wrk->pending_tx_nexts, next_index);
1112 if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node)) > 0))
1113 session_tx_trace_frame (vm, node, next_index, wrk->pending_tx_buffers,
1114 ctx->n_segs_per_evt, ctx->s, n_trace);
1116 if (PREDICT_FALSE (n_bufs))
1117 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1119 *n_tx_packets += ctx->n_segs_per_evt;
1121 SESSION_EVT (SESSION_EVT_DEQ, ctx->s, ctx->max_len_to_snd, ctx->max_dequeue,
1122 ctx->s->tx_fifo->has_event, wrk->last_vlib_time);
1124 ASSERT (ctx->left_to_snd == 0);
1126 /* If we couldn't dequeue all bytes reschedule as old flow. Otherwise,
1127 * check if application enqueued more data and reschedule accordingly */
1128 if (ctx->max_len_to_snd < ctx->max_dequeue)
1129 session_evt_add_old (wrk, elt);
1131 session_tx_maybe_reschedule (wrk, ctx, elt);
1135 u32 n_dequeued = ctx->max_len_to_snd;
1136 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
1137 n_dequeued += ctx->n_segs_per_evt * SESSION_CONN_HDR_LEN;
1138 if (svm_fifo_needs_deq_ntf (ctx->s->tx_fifo, n_dequeued))
1139 session_dequeue_notify (ctx->s);
1141 return SESSION_TX_OK;
1145 session_tx_fifo_peek_and_snd (session_worker_t * wrk,
1146 vlib_node_runtime_t * node,
1147 session_evt_elt_t * e, int *n_tx_packets)
1149 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 1);
1153 session_tx_fifo_dequeue_and_snd (session_worker_t * wrk,
1154 vlib_node_runtime_t * node,
1155 session_evt_elt_t * e, int *n_tx_packets)
1157 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 0);
1161 session_tx_fifo_dequeue_internal (session_worker_t * wrk,
1162 vlib_node_runtime_t * node,
1163 session_evt_elt_t * elt, int *n_tx_packets)
1165 transport_send_params_t *sp = &wrk->ctx.sp;
1166 session_t *s = wrk->ctx.s;
1169 if (PREDICT_FALSE (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
1172 /* Clear custom-tx flag used to request reschedule for tx */
1173 s->flags &= ~SESSION_F_CUSTOM_TX;
1175 sp->max_burst_size = clib_min (SESSION_NODE_FRAME_SIZE - *n_tx_packets,
1176 TRANSPORT_PACER_MAX_BURST_PKTS);
1178 n_packets = transport_custom_tx (session_get_transport_proto (s), s, sp);
1179 *n_tx_packets += n_packets;
1181 if (s->flags & SESSION_F_CUSTOM_TX)
1183 session_evt_add_old (wrk, elt);
1185 else if (!(sp->flags & TRANSPORT_SND_F_DESCHED))
1187 svm_fifo_unset_event (s->tx_fifo);
1188 if (svm_fifo_max_dequeue_cons (s->tx_fifo))
1189 if (svm_fifo_set_event (s->tx_fifo))
1190 session_evt_add_head_old (wrk, elt);
1193 if (sp->max_burst_size &&
1194 svm_fifo_needs_deq_ntf (s->tx_fifo, sp->max_burst_size))
1195 session_dequeue_notify (s);
1200 always_inline session_t *
1201 session_event_get_session (session_worker_t * wrk, session_event_t * e)
1203 if (PREDICT_FALSE (pool_is_free_index (wrk->sessions, e->session_index)))
1206 ASSERT (session_is_valid (e->session_index, wrk->vm->thread_index));
1207 return pool_elt_at_index (wrk->sessions, e->session_index);
1211 session_event_dispatch_ctrl (session_worker_t * wrk, session_evt_elt_t * elt)
1213 clib_llist_index_t ei;
1214 void (*fp) (void *);
1218 ei = clib_llist_entry_index (wrk->event_elts, elt);
1221 switch (e->event_type)
1223 case SESSION_CTRL_EVT_RPC:
1224 fp = e->rpc_args.fp;
1225 (*fp) (e->rpc_args.arg);
1227 case SESSION_CTRL_EVT_CLOSE:
1228 s = session_get_from_handle_if_valid (e->session_handle);
1229 if (PREDICT_FALSE (!s))
1231 session_transport_close (s);
1233 case SESSION_CTRL_EVT_RESET:
1234 s = session_get_from_handle_if_valid (e->session_handle);
1235 if (PREDICT_FALSE (!s))
1237 session_transport_reset (s);
1239 case SESSION_CTRL_EVT_LISTEN:
1240 session_mq_listen_handler (session_evt_ctrl_data (wrk, elt));
1242 case SESSION_CTRL_EVT_LISTEN_URI:
1243 session_mq_listen_uri_handler (session_evt_ctrl_data (wrk, elt));
1245 case SESSION_CTRL_EVT_UNLISTEN:
1246 session_mq_unlisten_handler (session_evt_ctrl_data (wrk, elt));
1248 case SESSION_CTRL_EVT_CONNECT:
1249 session_mq_connect_handler (session_evt_ctrl_data (wrk, elt));
1251 case SESSION_CTRL_EVT_CONNECT_URI:
1252 session_mq_connect_uri_handler (session_evt_ctrl_data (wrk, elt));
1254 case SESSION_CTRL_EVT_DISCONNECT:
1255 session_mq_disconnect_handler (session_evt_ctrl_data (wrk, elt));
1257 case SESSION_CTRL_EVT_DISCONNECTED:
1258 session_mq_disconnected_handler (session_evt_ctrl_data (wrk, elt));
1260 case SESSION_CTRL_EVT_ACCEPTED_REPLY:
1261 session_mq_accepted_reply_handler (session_evt_ctrl_data (wrk, elt));
1263 case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
1264 session_mq_disconnected_reply_handler (session_evt_ctrl_data (wrk,
1267 case SESSION_CTRL_EVT_RESET_REPLY:
1268 session_mq_reset_reply_handler (session_evt_ctrl_data (wrk, elt));
1270 case SESSION_CTRL_EVT_WORKER_UPDATE:
1271 session_mq_worker_update_handler (session_evt_ctrl_data (wrk, elt));
1273 case SESSION_CTRL_EVT_APP_DETACH:
1274 app_mq_detach_handler (session_evt_ctrl_data (wrk, elt));
1276 case SESSION_CTRL_EVT_APP_WRK_RPC:
1277 session_mq_app_wrk_rpc_handler (session_evt_ctrl_data (wrk, elt));
1280 clib_warning ("unhandled event type %d", e->event_type);
1283 /* Regrab elements in case pool moved */
1284 elt = pool_elt_at_index (wrk->event_elts, ei);
1285 if (!clib_llist_elt_is_linked (elt, evt_list))
1288 if (e->event_type >= SESSION_CTRL_EVT_BOUND)
1289 session_evt_ctrl_data_free (wrk, elt);
1290 session_evt_elt_free (wrk, elt);
1292 SESSION_EVT (SESSION_EVT_COUNTS, CNT_CTRL_EVTS, 1, wrk);
1296 session_event_dispatch_io (session_worker_t * wrk, vlib_node_runtime_t * node,
1297 session_evt_elt_t * elt, int *n_tx_packets)
1299 session_main_t *smm = &session_main;
1300 app_worker_t *app_wrk;
1301 clib_llist_index_t ei;
1305 ei = clib_llist_entry_index (wrk->event_elts, elt);
1308 switch (e->event_type)
1310 case SESSION_IO_EVT_TX_FLUSH:
1311 case SESSION_IO_EVT_TX:
1312 s = session_event_get_session (wrk, e);
1313 if (PREDICT_FALSE (!s))
1315 CLIB_PREFETCH (s->tx_fifo, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
1317 /* Spray packets in per session type frames, since they go to
1318 * different nodes */
1319 (smm->session_tx_fns[s->session_type]) (wrk, node, elt, n_tx_packets);
1321 case SESSION_IO_EVT_RX:
1322 s = session_event_get_session (wrk, e);
1325 transport_app_rx_evt (session_get_transport_proto (s),
1326 s->connection_index, s->thread_index);
1328 case SESSION_IO_EVT_BUILTIN_RX:
1329 s = session_event_get_session (wrk, e);
1330 if (PREDICT_FALSE (!s || s->session_state >= SESSION_STATE_CLOSING))
1332 svm_fifo_unset_event (s->rx_fifo);
1333 app_wrk = app_worker_get (s->app_wrk_index);
1334 app_worker_builtin_rx (app_wrk, s);
1336 case SESSION_IO_EVT_BUILTIN_TX:
1337 s = session_get_from_handle_if_valid (e->session_handle);
1339 if (PREDICT_TRUE (s != 0))
1340 session_tx_fifo_dequeue_internal (wrk, node, elt, n_tx_packets);
1343 clib_warning ("unhandled event type %d", e->event_type);
1346 SESSION_EVT (SESSION_IO_EVT_COUNTS, e->event_type, 1, wrk);
1348 /* Regrab elements in case pool moved */
1349 elt = pool_elt_at_index (wrk->event_elts, ei);
1350 if (!clib_llist_elt_is_linked (elt, evt_list))
1351 session_evt_elt_free (wrk, elt);
1355 static const u32 session_evt_msg_sizes[] = {
1356 #define _(symc, sym) \
1357 [SESSION_CTRL_EVT_ ## symc] = sizeof (session_ ## sym ##_msg_t),
1358 foreach_session_ctrl_evt
1364 session_evt_add_to_list (session_worker_t * wrk, session_event_t * evt)
1366 session_evt_elt_t *elt;
1368 if (evt->event_type >= SESSION_CTRL_EVT_RPC)
1370 elt = session_evt_alloc_ctrl (wrk);
1371 if (evt->event_type >= SESSION_CTRL_EVT_BOUND)
1373 elt->evt.ctrl_data_index = session_evt_ctrl_data_alloc (wrk);
1374 elt->evt.event_type = evt->event_type;
1375 clib_memcpy_fast (session_evt_ctrl_data (wrk, elt), evt->data,
1376 session_evt_msg_sizes[evt->event_type]);
1380 /* Internal control events fit into io events footprint */
1381 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1386 elt = session_evt_alloc_new (wrk);
1387 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1392 session_flush_pending_tx_buffers (session_worker_t * wrk,
1393 vlib_node_runtime_t * node)
1395 vlib_buffer_enqueue_to_next (wrk->vm, node, wrk->pending_tx_buffers,
1396 wrk->pending_tx_nexts,
1397 vec_len (wrk->pending_tx_nexts));
1398 vec_reset_length (wrk->pending_tx_buffers);
1399 vec_reset_length (wrk->pending_tx_nexts);
1403 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1404 vlib_frame_t * frame)
1406 session_main_t *smm = vnet_get_session_main ();
1407 u32 thread_index = vm->thread_index, n_to_dequeue;
1408 session_worker_t *wrk = &smm->wrk[thread_index];
1409 session_evt_elt_t *elt, *ctrl_he, *new_he, *old_he;
1410 clib_llist_index_t ei, next_ei, old_ti;
1411 svm_msg_q_msg_t _msg, *msg = &_msg;
1412 int i = 0, n_tx_packets;
1413 session_event_t *evt;
1416 SESSION_EVT (SESSION_EVT_DISPATCH_START, wrk);
1418 wrk->last_vlib_time = vlib_time_now (vm);
1419 wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ;
1422 * Update transport time
1424 transport_update_time (wrk->last_vlib_time, thread_index);
1425 n_tx_packets = vec_len (wrk->pending_tx_buffers);
1426 SESSION_EVT (SESSION_EVT_DSP_CNTRS, UPDATE_TIME, wrk);
1429 * Dequeue and handle new events
1432 /* Try to dequeue what is available. Don't wait for lock.
1433 * XXX: we may need priorities here */
1434 mq = wrk->vpp_event_queue;
1435 n_to_dequeue = svm_msg_q_size (mq);
1438 for (i = 0; i < n_to_dequeue; i++)
1440 svm_msg_q_sub_raw (mq, msg);
1441 evt = svm_msg_q_msg_data (mq, msg);
1442 session_evt_add_to_list (wrk, evt);
1443 svm_msg_q_free_msg (mq, msg);
1447 SESSION_EVT (SESSION_EVT_DSP_CNTRS, MQ_DEQ, wrk, n_to_dequeue, !i);
1450 * Handle control events
1453 ctrl_he = pool_elt_at_index (wrk->event_elts, wrk->ctrl_head);
1456 clib_llist_foreach_safe (wrk->event_elts, evt_list, ctrl_he, elt, ({
1457 clib_llist_remove (wrk->event_elts, evt_list, elt);
1458 session_event_dispatch_ctrl (wrk, elt);
1462 SESSION_EVT (SESSION_EVT_DSP_CNTRS, CTRL_EVTS, wrk);
1465 * Handle the new io events.
1468 new_he = pool_elt_at_index (wrk->event_elts, wrk->new_head);
1469 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1470 old_ti = clib_llist_prev_index (old_he, evt_list);
1472 ei = clib_llist_next_index (new_he, evt_list);
1473 while (ei != wrk->new_head && n_tx_packets < SESSION_NODE_FRAME_SIZE)
1475 elt = pool_elt_at_index (wrk->event_elts, ei);
1476 ei = clib_llist_next_index (elt, evt_list);
1477 clib_llist_remove (wrk->event_elts, evt_list, elt);
1478 session_event_dispatch_io (wrk, node, elt, &n_tx_packets);
1481 SESSION_EVT (SESSION_EVT_DSP_CNTRS, NEW_IO_EVTS, wrk);
1484 * Handle the old io events, if we had any prior to processing the new ones
1487 if (old_ti != wrk->old_head)
1489 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1490 ei = clib_llist_next_index (old_he, evt_list);
1492 while (n_tx_packets < SESSION_NODE_FRAME_SIZE)
1494 elt = pool_elt_at_index (wrk->event_elts, ei);
1495 next_ei = clib_llist_next_index (elt, evt_list);
1496 clib_llist_remove (wrk->event_elts, evt_list, elt);
1498 session_event_dispatch_io (wrk, node, elt, &n_tx_packets);
1507 SESSION_EVT (SESSION_EVT_DSP_CNTRS, OLD_IO_EVTS, wrk);
1509 if (vec_len (wrk->pending_tx_buffers))
1510 session_flush_pending_tx_buffers (wrk, node);
1512 vlib_node_increment_counter (vm, session_queue_node.index,
1513 SESSION_QUEUE_ERROR_TX, n_tx_packets);
1515 SESSION_EVT (SESSION_EVT_DISPATCH_END, wrk, n_tx_packets);
1517 return n_tx_packets;
1521 VLIB_REGISTER_NODE (session_queue_node) =
1523 .function = session_queue_node_fn,
1524 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
1525 .name = "session-queue",
1526 .format_trace = format_session_queue_trace,
1527 .type = VLIB_NODE_TYPE_INPUT,
1528 .n_errors = ARRAY_LEN (session_queue_error_strings),
1529 .error_strings = session_queue_error_strings,
1530 .state = VLIB_NODE_STATE_DISABLED,
1534 static clib_error_t *
1535 session_queue_exit (vlib_main_t * vm)
1537 if (vlib_get_n_threads () < 2)
1541 * Shut off (especially) worker-thread session nodes.
1542 * Otherwise, vpp can crash as the main thread unmaps the
1545 vlib_worker_thread_barrier_sync (vm);
1546 session_node_enable_disable (0 /* is_enable */ );
1547 vlib_worker_thread_barrier_release (vm);
1551 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
1554 session_queue_run_on_main (vlib_main_t * vm)
1556 vlib_node_runtime_t *node;
1558 node = vlib_node_get_runtime (vm, session_queue_node.index);
1559 return session_queue_node_fn (vm, node, 0);
1563 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1566 uword *event_data = 0;
1572 vlib_process_wait_for_event_or_clock (vm, timeout);
1573 event_type = vlib_process_get_events (vm, (uword **) & event_data);
1577 case SESSION_Q_PROCESS_RUN_ON_MAIN:
1578 /* Run session queue node on main thread */
1579 session_queue_run_on_main (vm);
1581 case SESSION_Q_PROCESS_STOP:
1582 vlib_node_set_state (vm, session_queue_process_node.index,
1583 VLIB_NODE_STATE_DISABLED);
1587 /* Timed out. Run on main to ensure all events are handled */
1588 session_queue_run_on_main (vm);
1591 vec_reset_length (event_data);
1597 VLIB_REGISTER_NODE (session_queue_process_node) =
1599 .function = session_queue_process,
1600 .type = VLIB_NODE_TYPE_PROCESS,
1601 .name = "session-queue-process",
1602 .state = VLIB_NODE_STATE_DISABLED,
1606 static_always_inline uword
1607 session_queue_pre_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1608 vlib_frame_t * frame)
1610 session_main_t *sm = &session_main;
1611 if (!sm->wrk[0].vpp_event_queue)
1613 node = vlib_node_get_runtime (vm, session_queue_node.index);
1614 return session_queue_node_fn (vm, node, frame);
1618 VLIB_REGISTER_NODE (session_queue_pre_input_node) =
1620 .function = session_queue_pre_input_inline,
1621 .type = VLIB_NODE_TYPE_PRE_INPUT,
1622 .name = "session-queue-main",
1623 .state = VLIB_NODE_STATE_DISABLED,
1628 * fd.io coding-style-patch-verification: ON
1631 * eval: (c-set-style "gnu")