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;
635 deq_now = clib_min (hdr->data_length - hdr->data_offset,
637 n_bytes_read = svm_fifo_peek (f, hdr->data_offset, deq_now,
639 ASSERT (n_bytes_read > 0);
641 hdr->data_offset += n_bytes_read;
642 if (hdr->data_offset == hdr->data_length)
644 u32 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
645 svm_fifo_dequeue_drop (f, offset);
646 if (ctx->left_to_snd > n_bytes_read)
647 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
650 else if (ctx->left_to_snd == n_bytes_read)
651 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
652 sizeof (session_dgram_pre_hdr_t));
655 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
658 ASSERT (n_bytes_read == len_to_deq);
659 chain_b->current_length = n_bytes_read;
660 b->total_length_not_including_first_buffer += chain_b->current_length;
662 /* update previous buffer */
663 prev_b->next_buffer = chain_bi0;
664 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
666 /* update current buffer */
667 chain_b->next_buffer = 0;
669 to_deq -= n_bytes_read;
674 && b->total_length_not_including_first_buffer == left_from_seg);
675 ctx->left_to_snd -= left_from_seg;
679 session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx,
680 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
687 * Start with the first buffer in chain
690 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
693 data0 = vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
694 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
698 n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo, ctx->sp.tx_offset,
700 ASSERT (n_bytes_read > 0);
701 /* Keep track of progress locally, transport is also supposed to
702 * increment it independently when pushing the header */
703 ctx->sp.tx_offset += n_bytes_read;
707 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
709 session_dgram_hdr_t *hdr = &ctx->hdr;
710 svm_fifo_t *f = ctx->s->tx_fifo;
714 ASSERT (hdr->data_length > hdr->data_offset);
715 deq_now = clib_min (hdr->data_length - hdr->data_offset,
717 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
718 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
719 ASSERT (n_bytes_read > 0);
721 if (ctx->s->session_state == SESSION_STATE_LISTENING)
723 ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4);
724 ctx->tc->rmt_port = hdr->rmt_port;
726 hdr->data_offset += n_bytes_read;
727 if (hdr->data_offset == hdr->data_length)
729 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
730 svm_fifo_dequeue_drop (f, offset);
731 if (ctx->left_to_snd > n_bytes_read)
732 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
735 else if (ctx->left_to_snd == n_bytes_read)
736 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
737 sizeof (session_dgram_pre_hdr_t));
741 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
743 ASSERT (n_bytes_read > 0);
746 b->current_length = n_bytes_read;
747 ctx->left_to_snd -= n_bytes_read;
750 * Fill in the remaining buffers in the chain, if any
752 if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
753 session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data);
757 session_tx_not_ready (session_t * s, u8 peek_data)
761 if (PREDICT_TRUE (s->session_state == SESSION_STATE_READY))
763 /* Can retransmit for closed sessions but can't send new data if
764 * session is not ready or closed */
765 else if (s->session_state < SESSION_STATE_READY)
767 else if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)
769 /* Allow closed transports to still send custom packets.
770 * For instance, tcp may want to send acks in time-wait. */
771 if (s->session_state != SESSION_STATE_TRANSPORT_DELETED
772 && (s->flags & SESSION_F_CUSTOM_TX))
780 always_inline transport_connection_t *
781 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
785 return ctx->transport_vft->get_connection (ctx->s->connection_index,
786 ctx->s->thread_index);
790 if (ctx->s->session_state == SESSION_STATE_LISTENING)
791 return ctx->transport_vft->get_listener (ctx->s->connection_index);
794 return ctx->transport_vft->get_connection (ctx->s->connection_index,
795 ctx->s->thread_index);
801 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
802 u32 max_segs, u8 peek_data)
804 u32 n_bytes_per_buf, n_bytes_per_seg;
806 n_bytes_per_buf = vlib_buffer_get_default_data_size (vm);
807 ctx->max_dequeue = svm_fifo_max_dequeue_cons (ctx->s->tx_fifo);
811 /* Offset in rx fifo from where to peek data */
812 if (PREDICT_FALSE (ctx->sp.tx_offset >= ctx->max_dequeue))
814 ctx->max_len_to_snd = 0;
817 ctx->max_dequeue -= ctx->sp.tx_offset;
821 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
823 u32 len, chain_limit;
825 if (ctx->max_dequeue <= sizeof (ctx->hdr))
827 ctx->max_len_to_snd = 0;
831 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
833 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
834 len = ctx->hdr.data_length - ctx->hdr.data_offset;
836 /* Process multiple dgrams if smaller than min (buf_space, mss).
837 * This avoids handling multiple dgrams if they require buffer
839 chain_limit = clib_min (n_bytes_per_buf - TRANSPORT_MAX_HDRS_LEN,
841 if (ctx->hdr.data_length <= chain_limit)
843 u32 first_dgram_len, dgram_len, offset, max_offset;
844 session_dgram_hdr_t hdr;
846 ctx->sp.snd_mss = clib_min (ctx->sp.snd_mss, len);
847 offset = ctx->hdr.data_length + sizeof (session_dgram_hdr_t);
848 first_dgram_len = len;
849 max_offset = clib_min (ctx->max_dequeue, 16 << 10);
851 while (offset < max_offset)
853 svm_fifo_peek (ctx->s->tx_fifo, offset, sizeof (ctx->hdr),
855 ASSERT (hdr.data_length > hdr.data_offset);
856 dgram_len = hdr.data_length - hdr.data_offset;
857 if (len + dgram_len > ctx->max_dequeue
858 || first_dgram_len != dgram_len)
861 offset += sizeof (hdr) + hdr.data_length;
865 ctx->max_dequeue = len;
868 ASSERT (ctx->max_dequeue > 0);
870 /* Ensure we're not writing more than transport window allows */
871 if (ctx->max_dequeue < ctx->sp.snd_space)
873 /* Constrained by tx queue. Try to send only fully formed segments */
874 ctx->max_len_to_snd = (ctx->max_dequeue > ctx->sp.snd_mss) ?
875 (ctx->max_dequeue - (ctx->max_dequeue % ctx->sp.snd_mss)) :
881 /* Expectation is that snd_space0 is already a multiple of snd_mss */
882 ctx->max_len_to_snd = ctx->sp.snd_space;
885 /* Check if we're tx constrained by the node */
886 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->sp.snd_mss);
887 if (ctx->n_segs_per_evt > max_segs)
889 ctx->n_segs_per_evt = max_segs;
890 ctx->max_len_to_snd = max_segs * ctx->sp.snd_mss;
893 ASSERT (n_bytes_per_buf > TRANSPORT_MAX_HDRS_LEN);
894 if (ctx->n_segs_per_evt > 1)
896 u32 n_bytes_last_seg, n_bufs_last_seg;
898 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->sp.snd_mss;
899 n_bytes_last_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd
900 - ((ctx->n_segs_per_evt - 1) * ctx->sp.snd_mss);
901 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
902 n_bufs_last_seg = ceil ((f64) n_bytes_last_seg / n_bytes_per_buf);
903 ctx->n_bufs_needed = ((ctx->n_segs_per_evt - 1) * ctx->n_bufs_per_seg)
908 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd;
909 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
910 ctx->n_bufs_needed = ctx->n_bufs_per_seg;
913 ctx->deq_per_buf = clib_min (ctx->sp.snd_mss, n_bytes_per_buf);
914 ctx->deq_per_first_buf = clib_min (ctx->sp.snd_mss,
916 TRANSPORT_MAX_HDRS_LEN);
920 session_tx_maybe_reschedule (session_worker_t * wrk,
921 session_tx_context_t * ctx,
922 session_evt_elt_t * elt)
924 session_t *s = ctx->s;
926 svm_fifo_unset_event (s->tx_fifo);
927 if (svm_fifo_max_dequeue_cons (s->tx_fifo) > ctx->sp.tx_offset)
928 if (svm_fifo_set_event (s->tx_fifo))
929 session_evt_add_head_old (wrk, elt);
933 session_tx_fifo_read_and_snd_i (session_worker_t * wrk,
934 vlib_node_runtime_t * node,
935 session_evt_elt_t * elt,
936 int *n_tx_packets, u8 peek_data)
938 u32 n_trace, n_left, pbi, next_index, max_burst;
939 session_tx_context_t *ctx = &wrk->ctx;
940 session_main_t *smm = &session_main;
941 session_event_t *e = &elt->evt;
942 vlib_main_t *vm = wrk->vm;
943 transport_proto_t tp;
947 if (PREDICT_FALSE ((rv = session_tx_not_ready (ctx->s, peek_data))))
950 session_evt_add_old (wrk, elt);
951 return SESSION_TX_NO_DATA;
954 next_index = smm->session_type_to_next[ctx->s->session_type];
955 max_burst = SESSION_NODE_FRAME_SIZE - *n_tx_packets;
957 tp = session_get_transport_proto (ctx->s);
958 ctx->transport_vft = transport_protocol_get_vft (tp);
959 ctx->tc = session_tx_get_transport (ctx, peek_data);
961 if (PREDICT_FALSE (e->event_type == SESSION_IO_EVT_TX_FLUSH))
963 if (ctx->transport_vft->flush_data)
964 ctx->transport_vft->flush_data (ctx->tc);
965 e->event_type = SESSION_IO_EVT_TX;
968 if (ctx->s->flags & SESSION_F_CUSTOM_TX)
971 ctx->s->flags &= ~SESSION_F_CUSTOM_TX;
972 ctx->sp.max_burst_size = max_burst;
973 n_custom_tx = ctx->transport_vft->custom_tx (ctx->tc, &ctx->sp);
974 *n_tx_packets += n_custom_tx;
976 (ctx->s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
977 return SESSION_TX_OK;
978 max_burst -= n_custom_tx;
979 if (!max_burst || (ctx->s->flags & SESSION_F_CUSTOM_TX))
981 session_evt_add_old (wrk, elt);
982 return SESSION_TX_OK;
986 transport_connection_snd_params (ctx->tc, &ctx->sp);
988 if (!ctx->sp.snd_space)
990 /* If the deschedule flag was set, remove session from scheduler.
991 * Transport is responsible for rescheduling this session. */
992 if (ctx->sp.flags & TRANSPORT_SND_F_DESCHED)
993 transport_connection_deschedule (ctx->tc);
994 /* Request to postpone the session, e.g., zero-wnd and transport
995 * is not currently probing */
996 else if (ctx->sp.flags & TRANSPORT_SND_F_POSTPONE)
997 session_evt_add_old (wrk, elt);
998 /* This flow queue is "empty" so it should be re-evaluated before
999 * the ones that have data to send. */
1001 session_evt_add_head_old (wrk, elt);
1003 return SESSION_TX_NO_DATA;
1006 if (transport_connection_is_tx_paced (ctx->tc))
1008 u32 snd_space = transport_connection_tx_pacer_burst (ctx->tc);
1009 if (snd_space < TRANSPORT_PACER_MIN_BURST)
1011 session_evt_add_head_old (wrk, elt);
1012 return SESSION_TX_NO_DATA;
1014 snd_space = clib_min (ctx->sp.snd_space, snd_space);
1015 ctx->sp.snd_space = snd_space >= ctx->sp.snd_mss ?
1016 snd_space - snd_space % ctx->sp.snd_mss : snd_space;
1019 /* Check how much we can pull. */
1020 session_tx_set_dequeue_params (vm, ctx, max_burst, peek_data);
1022 if (PREDICT_FALSE (!ctx->max_len_to_snd))
1024 transport_connection_tx_pacer_reset_bucket (ctx->tc, 0);
1025 session_tx_maybe_reschedule (wrk, ctx, elt);
1026 return SESSION_TX_NO_DATA;
1029 vec_validate_aligned (wrk->tx_buffers, ctx->n_bufs_needed - 1,
1030 CLIB_CACHE_LINE_BYTES);
1031 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, ctx->n_bufs_needed);
1032 if (PREDICT_FALSE (n_bufs < ctx->n_bufs_needed))
1035 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1036 session_evt_add_head_old (wrk, elt);
1037 vlib_node_increment_counter (wrk->vm, node->node_index,
1038 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
1039 return SESSION_TX_NO_BUFFERS;
1042 if (transport_connection_is_tx_paced (ctx->tc))
1043 transport_connection_tx_pacer_update_bytes (ctx->tc, ctx->max_len_to_snd);
1045 ctx->left_to_snd = ctx->max_len_to_snd;
1046 n_left = ctx->n_segs_per_evt;
1050 vlib_buffer_t *b0, *b1;
1053 pbi = wrk->tx_buffers[n_bufs - 3];
1054 pb = vlib_get_buffer (vm, pbi);
1055 vlib_prefetch_buffer_header (pb, STORE);
1056 pbi = wrk->tx_buffers[n_bufs - 4];
1057 pb = vlib_get_buffer (vm, pbi);
1058 vlib_prefetch_buffer_header (pb, STORE);
1060 bi0 = wrk->tx_buffers[--n_bufs];
1061 bi1 = wrk->tx_buffers[--n_bufs];
1063 b0 = vlib_get_buffer (vm, bi0);
1064 b1 = vlib_get_buffer (vm, bi1);
1066 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
1067 session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
1069 ctx->transport_vft->push_header (ctx->tc, b0);
1070 ctx->transport_vft->push_header (ctx->tc, b1);
1074 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1075 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
1077 vec_add1 (wrk->pending_tx_buffers, bi0);
1078 vec_add1 (wrk->pending_tx_buffers, bi1);
1079 vec_add1 (wrk->pending_tx_nexts, next_index);
1080 vec_add1 (wrk->pending_tx_nexts, next_index);
1089 pbi = wrk->tx_buffers[n_bufs - 2];
1090 pb = vlib_get_buffer (vm, pbi);
1091 vlib_prefetch_buffer_header (pb, STORE);
1094 bi0 = wrk->tx_buffers[--n_bufs];
1095 b0 = vlib_get_buffer (vm, bi0);
1096 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
1098 /* Ask transport to push header after current_length and
1099 * total_length_not_including_first_buffer are updated */
1100 ctx->transport_vft->push_header (ctx->tc, b0);
1104 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1106 vec_add1 (wrk->pending_tx_buffers, bi0);
1107 vec_add1 (wrk->pending_tx_nexts, next_index);
1110 if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node)) > 0))
1111 session_tx_trace_frame (vm, node, next_index, wrk->pending_tx_buffers,
1112 ctx->n_segs_per_evt, ctx->s, n_trace);
1114 if (PREDICT_FALSE (n_bufs))
1115 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1117 *n_tx_packets += ctx->n_segs_per_evt;
1119 SESSION_EVT (SESSION_EVT_DEQ, ctx->s, ctx->max_len_to_snd, ctx->max_dequeue,
1120 ctx->s->tx_fifo->has_event, wrk->last_vlib_time);
1122 ASSERT (ctx->left_to_snd == 0);
1124 /* If we couldn't dequeue all bytes reschedule as old flow. Otherwise,
1125 * check if application enqueued more data and reschedule accordingly */
1126 if (ctx->max_len_to_snd < ctx->max_dequeue)
1127 session_evt_add_old (wrk, elt);
1129 session_tx_maybe_reschedule (wrk, ctx, elt);
1133 u32 n_dequeued = ctx->max_len_to_snd;
1134 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
1135 n_dequeued += ctx->n_segs_per_evt * SESSION_CONN_HDR_LEN;
1136 if (svm_fifo_needs_deq_ntf (ctx->s->tx_fifo, n_dequeued))
1137 session_dequeue_notify (ctx->s);
1139 return SESSION_TX_OK;
1143 session_tx_fifo_peek_and_snd (session_worker_t * wrk,
1144 vlib_node_runtime_t * node,
1145 session_evt_elt_t * e, int *n_tx_packets)
1147 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 1);
1151 session_tx_fifo_dequeue_and_snd (session_worker_t * wrk,
1152 vlib_node_runtime_t * node,
1153 session_evt_elt_t * e, int *n_tx_packets)
1155 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 0);
1159 session_tx_fifo_dequeue_internal (session_worker_t * wrk,
1160 vlib_node_runtime_t * node,
1161 session_evt_elt_t * elt, int *n_tx_packets)
1163 transport_send_params_t *sp = &wrk->ctx.sp;
1164 session_t *s = wrk->ctx.s;
1167 if (PREDICT_FALSE (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
1170 /* Clear custom-tx flag used to request reschedule for tx */
1171 s->flags &= ~SESSION_F_CUSTOM_TX;
1173 sp->max_burst_size = clib_min (SESSION_NODE_FRAME_SIZE - *n_tx_packets,
1174 TRANSPORT_PACER_MAX_BURST_PKTS);
1176 n_packets = transport_custom_tx (session_get_transport_proto (s), s, sp);
1177 *n_tx_packets += n_packets;
1179 if (s->flags & SESSION_F_CUSTOM_TX)
1181 session_evt_add_old (wrk, elt);
1183 else if (!(sp->flags & TRANSPORT_SND_F_DESCHED))
1185 svm_fifo_unset_event (s->tx_fifo);
1186 if (svm_fifo_max_dequeue_cons (s->tx_fifo))
1187 if (svm_fifo_set_event (s->tx_fifo))
1188 session_evt_add_head_old (wrk, elt);
1191 if (sp->max_burst_size &&
1192 svm_fifo_needs_deq_ntf (s->tx_fifo, sp->max_burst_size))
1193 session_dequeue_notify (s);
1198 always_inline session_t *
1199 session_event_get_session (session_worker_t * wrk, session_event_t * e)
1201 if (PREDICT_FALSE (pool_is_free_index (wrk->sessions, e->session_index)))
1204 ASSERT (session_is_valid (e->session_index, wrk->vm->thread_index));
1205 return pool_elt_at_index (wrk->sessions, e->session_index);
1209 session_event_dispatch_ctrl (session_worker_t * wrk, session_evt_elt_t * elt)
1211 clib_llist_index_t ei;
1212 void (*fp) (void *);
1216 ei = clib_llist_entry_index (wrk->event_elts, elt);
1219 switch (e->event_type)
1221 case SESSION_CTRL_EVT_RPC:
1222 fp = e->rpc_args.fp;
1223 (*fp) (e->rpc_args.arg);
1225 case SESSION_CTRL_EVT_CLOSE:
1226 s = session_get_from_handle_if_valid (e->session_handle);
1227 if (PREDICT_FALSE (!s))
1229 session_transport_close (s);
1231 case SESSION_CTRL_EVT_RESET:
1232 s = session_get_from_handle_if_valid (e->session_handle);
1233 if (PREDICT_FALSE (!s))
1235 session_transport_reset (s);
1237 case SESSION_CTRL_EVT_LISTEN:
1238 session_mq_listen_handler (session_evt_ctrl_data (wrk, elt));
1240 case SESSION_CTRL_EVT_LISTEN_URI:
1241 session_mq_listen_uri_handler (session_evt_ctrl_data (wrk, elt));
1243 case SESSION_CTRL_EVT_UNLISTEN:
1244 session_mq_unlisten_handler (session_evt_ctrl_data (wrk, elt));
1246 case SESSION_CTRL_EVT_CONNECT:
1247 session_mq_connect_handler (session_evt_ctrl_data (wrk, elt));
1249 case SESSION_CTRL_EVT_CONNECT_URI:
1250 session_mq_connect_uri_handler (session_evt_ctrl_data (wrk, elt));
1252 case SESSION_CTRL_EVT_DISCONNECT:
1253 session_mq_disconnect_handler (session_evt_ctrl_data (wrk, elt));
1255 case SESSION_CTRL_EVT_DISCONNECTED:
1256 session_mq_disconnected_handler (session_evt_ctrl_data (wrk, elt));
1258 case SESSION_CTRL_EVT_ACCEPTED_REPLY:
1259 session_mq_accepted_reply_handler (session_evt_ctrl_data (wrk, elt));
1261 case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
1262 session_mq_disconnected_reply_handler (session_evt_ctrl_data (wrk,
1265 case SESSION_CTRL_EVT_RESET_REPLY:
1266 session_mq_reset_reply_handler (session_evt_ctrl_data (wrk, elt));
1268 case SESSION_CTRL_EVT_WORKER_UPDATE:
1269 session_mq_worker_update_handler (session_evt_ctrl_data (wrk, elt));
1271 case SESSION_CTRL_EVT_APP_DETACH:
1272 app_mq_detach_handler (session_evt_ctrl_data (wrk, elt));
1274 case SESSION_CTRL_EVT_APP_WRK_RPC:
1275 session_mq_app_wrk_rpc_handler (session_evt_ctrl_data (wrk, elt));
1278 clib_warning ("unhandled event type %d", e->event_type);
1281 /* Regrab elements in case pool moved */
1282 elt = pool_elt_at_index (wrk->event_elts, ei);
1283 if (!clib_llist_elt_is_linked (elt, evt_list))
1286 if (e->event_type >= SESSION_CTRL_EVT_BOUND)
1287 session_evt_ctrl_data_free (wrk, elt);
1288 session_evt_elt_free (wrk, elt);
1290 SESSION_EVT (SESSION_EVT_COUNTS, CNT_CTRL_EVTS, 1, wrk);
1294 session_event_dispatch_io (session_worker_t * wrk, vlib_node_runtime_t * node,
1295 session_evt_elt_t * elt, int *n_tx_packets)
1297 session_main_t *smm = &session_main;
1298 app_worker_t *app_wrk;
1299 clib_llist_index_t ei;
1303 ei = clib_llist_entry_index (wrk->event_elts, elt);
1306 switch (e->event_type)
1308 case SESSION_IO_EVT_TX_FLUSH:
1309 case SESSION_IO_EVT_TX:
1310 s = session_event_get_session (wrk, e);
1311 if (PREDICT_FALSE (!s))
1313 CLIB_PREFETCH (s->tx_fifo, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
1315 /* Spray packets in per session type frames, since they go to
1316 * different nodes */
1317 (smm->session_tx_fns[s->session_type]) (wrk, node, elt, n_tx_packets);
1319 case SESSION_IO_EVT_RX:
1320 s = session_event_get_session (wrk, e);
1323 transport_app_rx_evt (session_get_transport_proto (s),
1324 s->connection_index, s->thread_index);
1326 case SESSION_IO_EVT_BUILTIN_RX:
1327 s = session_event_get_session (wrk, e);
1328 if (PREDICT_FALSE (!s || s->session_state >= SESSION_STATE_CLOSING))
1330 svm_fifo_unset_event (s->rx_fifo);
1331 app_wrk = app_worker_get (s->app_wrk_index);
1332 app_worker_builtin_rx (app_wrk, s);
1334 case SESSION_IO_EVT_BUILTIN_TX:
1335 s = session_get_from_handle_if_valid (e->session_handle);
1337 if (PREDICT_TRUE (s != 0))
1338 session_tx_fifo_dequeue_internal (wrk, node, elt, n_tx_packets);
1341 clib_warning ("unhandled event type %d", e->event_type);
1344 SESSION_EVT (SESSION_IO_EVT_COUNTS, e->event_type, 1, wrk);
1346 /* Regrab elements in case pool moved */
1347 elt = pool_elt_at_index (wrk->event_elts, ei);
1348 if (!clib_llist_elt_is_linked (elt, evt_list))
1349 session_evt_elt_free (wrk, elt);
1353 static const u32 session_evt_msg_sizes[] = {
1354 #define _(symc, sym) \
1355 [SESSION_CTRL_EVT_ ## symc] = sizeof (session_ ## sym ##_msg_t),
1356 foreach_session_ctrl_evt
1362 session_evt_add_to_list (session_worker_t * wrk, session_event_t * evt)
1364 session_evt_elt_t *elt;
1366 if (evt->event_type >= SESSION_CTRL_EVT_RPC)
1368 elt = session_evt_alloc_ctrl (wrk);
1369 if (evt->event_type >= SESSION_CTRL_EVT_BOUND)
1371 elt->evt.ctrl_data_index = session_evt_ctrl_data_alloc (wrk);
1372 elt->evt.event_type = evt->event_type;
1373 clib_memcpy_fast (session_evt_ctrl_data (wrk, elt), evt->data,
1374 session_evt_msg_sizes[evt->event_type]);
1378 /* Internal control events fit into io events footprint */
1379 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1384 elt = session_evt_alloc_new (wrk);
1385 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1390 session_flush_pending_tx_buffers (session_worker_t * wrk,
1391 vlib_node_runtime_t * node)
1393 vlib_buffer_enqueue_to_next (wrk->vm, node, wrk->pending_tx_buffers,
1394 wrk->pending_tx_nexts,
1395 vec_len (wrk->pending_tx_nexts));
1396 vec_reset_length (wrk->pending_tx_buffers);
1397 vec_reset_length (wrk->pending_tx_nexts);
1401 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1402 vlib_frame_t * frame)
1404 session_main_t *smm = vnet_get_session_main ();
1405 u32 thread_index = vm->thread_index, n_to_dequeue;
1406 session_worker_t *wrk = &smm->wrk[thread_index];
1407 session_evt_elt_t *elt, *ctrl_he, *new_he, *old_he;
1408 clib_llist_index_t ei, next_ei, old_ti;
1409 svm_msg_q_msg_t _msg, *msg = &_msg;
1410 int i = 0, n_tx_packets;
1411 session_event_t *evt;
1414 SESSION_EVT (SESSION_EVT_DISPATCH_START, wrk);
1416 wrk->last_vlib_time = vlib_time_now (vm);
1417 wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ;
1420 * Update transport time
1422 transport_update_time (wrk->last_vlib_time, thread_index);
1423 n_tx_packets = vec_len (wrk->pending_tx_buffers);
1424 SESSION_EVT (SESSION_EVT_DSP_CNTRS, UPDATE_TIME, wrk);
1427 * Dequeue and handle new events
1430 /* Try to dequeue what is available. Don't wait for lock.
1431 * XXX: we may need priorities here */
1432 mq = wrk->vpp_event_queue;
1433 n_to_dequeue = svm_msg_q_size (mq);
1436 for (i = 0; i < n_to_dequeue; i++)
1438 svm_msg_q_sub_raw (mq, msg);
1439 evt = svm_msg_q_msg_data (mq, msg);
1440 session_evt_add_to_list (wrk, evt);
1441 svm_msg_q_free_msg (mq, msg);
1445 SESSION_EVT (SESSION_EVT_DSP_CNTRS, MQ_DEQ, wrk, n_to_dequeue, !i);
1448 * Handle control events
1451 ctrl_he = pool_elt_at_index (wrk->event_elts, wrk->ctrl_head);
1454 clib_llist_foreach_safe (wrk->event_elts, evt_list, ctrl_he, elt, ({
1455 clib_llist_remove (wrk->event_elts, evt_list, elt);
1456 session_event_dispatch_ctrl (wrk, elt);
1460 SESSION_EVT (SESSION_EVT_DSP_CNTRS, CTRL_EVTS, wrk);
1463 * Handle the new io events.
1466 new_he = pool_elt_at_index (wrk->event_elts, wrk->new_head);
1467 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1468 old_ti = clib_llist_prev_index (old_he, evt_list);
1470 ei = clib_llist_next_index (new_he, evt_list);
1471 while (ei != wrk->new_head && n_tx_packets < SESSION_NODE_FRAME_SIZE)
1473 elt = pool_elt_at_index (wrk->event_elts, ei);
1474 ei = clib_llist_next_index (elt, evt_list);
1475 clib_llist_remove (wrk->event_elts, evt_list, elt);
1476 session_event_dispatch_io (wrk, node, elt, &n_tx_packets);
1479 SESSION_EVT (SESSION_EVT_DSP_CNTRS, NEW_IO_EVTS, wrk);
1482 * Handle the old io events, if we had any prior to processing the new ones
1485 if (old_ti != wrk->old_head)
1487 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1488 ei = clib_llist_next_index (old_he, evt_list);
1490 while (n_tx_packets < SESSION_NODE_FRAME_SIZE)
1492 elt = pool_elt_at_index (wrk->event_elts, ei);
1493 next_ei = clib_llist_next_index (elt, evt_list);
1494 clib_llist_remove (wrk->event_elts, evt_list, elt);
1496 session_event_dispatch_io (wrk, node, elt, &n_tx_packets);
1505 SESSION_EVT (SESSION_EVT_DSP_CNTRS, OLD_IO_EVTS, wrk);
1507 if (vec_len (wrk->pending_tx_buffers))
1508 session_flush_pending_tx_buffers (wrk, node);
1510 vlib_node_increment_counter (vm, session_queue_node.index,
1511 SESSION_QUEUE_ERROR_TX, n_tx_packets);
1513 SESSION_EVT (SESSION_EVT_DISPATCH_END, wrk, n_tx_packets);
1515 return n_tx_packets;
1519 VLIB_REGISTER_NODE (session_queue_node) =
1521 .function = session_queue_node_fn,
1522 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
1523 .name = "session-queue",
1524 .format_trace = format_session_queue_trace,
1525 .type = VLIB_NODE_TYPE_INPUT,
1526 .n_errors = ARRAY_LEN (session_queue_error_strings),
1527 .error_strings = session_queue_error_strings,
1528 .state = VLIB_NODE_STATE_DISABLED,
1532 static clib_error_t *
1533 session_queue_exit (vlib_main_t * vm)
1535 if (vec_len (vlib_mains) < 2)
1539 * Shut off (especially) worker-thread session nodes.
1540 * Otherwise, vpp can crash as the main thread unmaps the
1543 vlib_worker_thread_barrier_sync (vm);
1544 session_node_enable_disable (0 /* is_enable */ );
1545 vlib_worker_thread_barrier_release (vm);
1549 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
1552 session_queue_run_on_main (vlib_main_t * vm)
1554 vlib_node_runtime_t *node;
1556 node = vlib_node_get_runtime (vm, session_queue_node.index);
1557 return session_queue_node_fn (vm, node, 0);
1561 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1564 uword *event_data = 0;
1570 vlib_process_wait_for_event_or_clock (vm, timeout);
1571 event_type = vlib_process_get_events (vm, (uword **) & event_data);
1575 case SESSION_Q_PROCESS_RUN_ON_MAIN:
1576 /* Run session queue node on main thread */
1577 session_queue_run_on_main (vm);
1579 case SESSION_Q_PROCESS_STOP:
1580 vlib_node_set_state (vm, session_queue_process_node.index,
1581 VLIB_NODE_STATE_DISABLED);
1585 /* Timed out. Run on main to ensure all events are handled */
1586 session_queue_run_on_main (vm);
1589 vec_reset_length (event_data);
1595 VLIB_REGISTER_NODE (session_queue_process_node) =
1597 .function = session_queue_process,
1598 .type = VLIB_NODE_TYPE_PROCESS,
1599 .name = "session-queue-process",
1600 .state = VLIB_NODE_STATE_DISABLED,
1604 static_always_inline uword
1605 session_queue_pre_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1606 vlib_frame_t * frame)
1608 session_main_t *sm = &session_main;
1609 if (!sm->wrk[0].vpp_event_queue)
1611 node = vlib_node_get_runtime (vm, session_queue_node.index);
1612 return session_queue_node_fn (vm, node, frame);
1616 VLIB_REGISTER_NODE (session_queue_pre_input_node) =
1618 .function = session_queue_pre_input_inline,
1619 .type = VLIB_NODE_TYPE_PRE_INPUT,
1620 .name = "session-queue-main",
1621 .state = VLIB_NODE_STATE_DISABLED,
1626 * fd.io coding-style-patch-verification: ON
1629 * eval: (c-set-style "gnu")