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>
27 #include <sys/timerfd.h>
29 #define app_check_thread_and_barrier(_fn, _arg) \
30 if (!vlib_thread_is_main_w_barrier ()) \
32 vlib_rpc_call_main_thread (_fn, (u8 *) _arg, sizeof(*_arg)); \
37 session_mq_listen_handler (void *data)
39 session_listen_msg_t *mp = (session_listen_msg_t *) data;
40 vnet_listen_args_t _a, *a = &_a;
41 app_worker_t *app_wrk;
45 app_check_thread_and_barrier (session_mq_listen_handler, mp);
47 app = application_lookup (mp->client_index);
51 clib_memset (a, 0, sizeof (*a));
52 a->sep.is_ip4 = mp->is_ip4;
53 ip_copy (&a->sep.ip, &mp->ip, mp->is_ip4);
54 a->sep.port = mp->port;
55 a->sep.fib_index = mp->vrf;
56 a->sep.sw_if_index = ENDPOINT_INVALID_INDEX;
57 a->sep.transport_proto = mp->proto;
58 a->sep_ext.ckpair_index = mp->ckpair_index;
59 a->sep_ext.crypto_engine = mp->crypto_engine;
60 a->app_index = app->app_index;
61 a->wrk_map_index = mp->wrk_index;
62 a->sep_ext.transport_flags = mp->flags;
64 if ((rv = vnet_listen (a)))
65 clib_warning ("listen returned: %U", format_session_error, rv);
67 app_wrk = application_get_worker (app, mp->wrk_index);
68 mq_send_session_bound_cb (app_wrk->wrk_index, mp->context, a->handle, rv);
73 session_mq_listen_uri_handler (void *data)
75 session_listen_uri_msg_t *mp = (session_listen_uri_msg_t *) data;
76 vnet_listen_args_t _a, *a = &_a;
77 app_worker_t *app_wrk;
81 app_check_thread_and_barrier (session_mq_listen_uri_handler, mp);
83 app = application_lookup (mp->client_index);
87 clib_memset (a, 0, sizeof (*a));
88 a->uri = (char *) mp->uri;
89 a->app_index = app->app_index;
90 rv = vnet_bind_uri (a);
92 app_wrk = application_get_worker (app, 0);
93 mq_send_session_bound_cb (app_wrk->wrk_index, mp->context, a->handle, rv);
97 session_mq_connect_handler (void *data)
99 session_connect_msg_t *mp = (session_connect_msg_t *) data;
100 vnet_connect_args_t _a, *a = &_a;
101 app_worker_t *app_wrk;
105 app_check_thread_and_barrier (session_mq_connect_handler, mp);
107 app = application_lookup (mp->client_index);
111 clib_memset (a, 0, sizeof (*a));
112 a->sep.is_ip4 = mp->is_ip4;
113 clib_memcpy_fast (&a->sep.ip, &mp->ip, sizeof (mp->ip));
114 a->sep.port = mp->port;
115 a->sep.transport_proto = mp->proto;
116 a->sep.peer.fib_index = mp->vrf;
117 clib_memcpy_fast (&a->sep.peer.ip, &mp->lcl_ip, sizeof (mp->lcl_ip));
120 ip46_address_mask_ip4 (&a->sep.ip);
121 ip46_address_mask_ip4 (&a->sep.peer.ip);
123 a->sep.peer.port = mp->lcl_port;
124 a->sep.peer.sw_if_index = ENDPOINT_INVALID_INDEX;
125 a->sep_ext.parent_handle = mp->parent_handle;
126 a->sep_ext.ckpair_index = mp->ckpair_index;
127 a->sep_ext.crypto_engine = mp->crypto_engine;
128 a->sep_ext.transport_flags = mp->flags;
129 if (mp->hostname_len)
131 vec_validate (a->sep_ext.hostname, mp->hostname_len - 1);
132 clib_memcpy_fast (a->sep_ext.hostname, mp->hostname, mp->hostname_len);
134 a->api_context = mp->context;
135 a->app_index = app->app_index;
136 a->wrk_map_index = mp->wrk_index;
138 if ((rv = vnet_connect (a)))
140 clib_warning ("connect returned: %U", format_session_error, rv);
141 app_wrk = application_get_worker (app, mp->wrk_index);
142 mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0, rv);
145 vec_free (a->sep_ext.hostname);
149 session_mq_connect_uri_handler (void *data)
151 session_connect_uri_msg_t *mp = (session_connect_uri_msg_t *) data;
152 vnet_connect_args_t _a, *a = &_a;
153 app_worker_t *app_wrk;
157 app_check_thread_and_barrier (session_mq_connect_uri_handler, mp);
159 app = application_lookup (mp->client_index);
163 clib_memset (a, 0, sizeof (*a));
164 a->uri = (char *) mp->uri;
165 a->api_context = mp->context;
166 a->app_index = app->app_index;
167 if ((rv = vnet_connect_uri (a)))
169 clib_warning ("connect_uri returned: %d", rv);
170 app_wrk = application_get_worker (app, 0 /* default wrk only */ );
171 mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0, rv);
176 session_mq_disconnect_handler (void *data)
178 session_disconnect_msg_t *mp = (session_disconnect_msg_t *) data;
179 vnet_disconnect_args_t _a, *a = &_a;
182 app = application_lookup (mp->client_index);
186 a->app_index = app->app_index;
187 a->handle = mp->handle;
188 vnet_disconnect_session (a);
192 app_mq_detach_handler (void *data)
194 session_app_detach_msg_t *mp = (session_app_detach_msg_t *) data;
195 vnet_app_detach_args_t _a, *a = &_a;
198 app_check_thread_and_barrier (app_mq_detach_handler, mp);
200 app = application_lookup (mp->client_index);
204 a->app_index = app->app_index;
205 a->api_client_index = mp->client_index;
206 vnet_application_detach (a);
210 session_mq_unlisten_handler (void *data)
212 session_unlisten_msg_t *mp = (session_unlisten_msg_t *) data;
213 vnet_unlisten_args_t _a, *a = &_a;
214 app_worker_t *app_wrk;
218 app_check_thread_and_barrier (session_mq_unlisten_handler, mp);
220 app = application_lookup (mp->client_index);
224 clib_memset (a, 0, sizeof (*a));
225 a->app_index = app->app_index;
226 a->handle = mp->handle;
227 a->wrk_map_index = mp->wrk_index;
228 if ((rv = vnet_unlisten (a)))
229 clib_warning ("unlisten returned: %d", rv);
231 app_wrk = application_get_worker (app, a->wrk_map_index);
235 mq_send_unlisten_reply (app_wrk, mp->handle, mp->context, rv);
239 session_mq_accepted_reply_handler (void *data)
241 session_accepted_reply_msg_t *mp = (session_accepted_reply_msg_t *) data;
242 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
243 session_state_t old_state;
244 app_worker_t *app_wrk;
247 /* Server isn't interested, kill the session */
250 a->app_index = mp->context;
251 a->handle = mp->handle;
252 vnet_disconnect_session (a);
256 /* Mail this back from the main thread. We're not polling in main
257 * thread so we're using other workers for notifications. */
258 if (vlib_num_workers () && vlib_get_thread_index () != 0
259 && session_thread_from_handle (mp->handle) == 0)
261 vlib_rpc_call_main_thread (session_mq_accepted_reply_handler,
262 (u8 *) mp, sizeof (*mp));
266 s = session_get_from_handle_if_valid (mp->handle);
270 app_wrk = app_worker_get (s->app_wrk_index);
271 if (app_wrk->app_index != mp->context)
273 clib_warning ("app doesn't own session");
277 if (!session_has_transport (s))
279 s->session_state = SESSION_STATE_READY;
280 if (ct_session_connect_notify (s))
285 old_state = s->session_state;
286 s->session_state = SESSION_STATE_READY;
288 if (!svm_fifo_is_empty_prod (s->rx_fifo))
289 app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
291 /* Closed while waiting for app to reply. Resend disconnect */
292 if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
294 app_worker_close_notify (app_wrk, s);
295 s->session_state = old_state;
302 session_mq_reset_reply_handler (void *data)
304 vnet_disconnect_args_t _a = { 0 }, *a = &_a;
305 session_reset_reply_msg_t *mp;
306 app_worker_t *app_wrk;
309 u32 index, thread_index;
311 mp = (session_reset_reply_msg_t *) data;
312 app = application_lookup (mp->context);
316 session_parse_handle (mp->handle, &index, &thread_index);
317 s = session_get_if_valid (index, thread_index);
319 /* No session or not the right session */
320 if (!s || s->session_state < SESSION_STATE_TRANSPORT_CLOSING)
323 app_wrk = app_worker_get (s->app_wrk_index);
324 if (!app_wrk || app_wrk->app_index != app->app_index)
326 clib_warning ("App %u does not own handle 0x%lx!", app->app_index,
331 /* Client objected to resetting the session, log and continue */
334 clib_warning ("client retval %d", mp->retval);
338 /* This comes as a response to a reset, transport only waiting for
339 * confirmation to remove connection state, no need to disconnect */
340 a->handle = mp->handle;
341 a->app_index = app->app_index;
342 vnet_disconnect_session (a);
346 session_mq_disconnected_handler (void *data)
348 session_disconnected_reply_msg_t *rmp;
349 vnet_disconnect_args_t _a, *a = &_a;
350 svm_msg_q_msg_t _msg, *msg = &_msg;
351 session_disconnected_msg_t *mp;
352 app_worker_t *app_wrk;
353 session_event_t *evt;
358 mp = (session_disconnected_msg_t *) data;
359 if (!(s = session_get_from_handle_if_valid (mp->handle)))
361 clib_warning ("could not disconnect handle %llu", mp->handle);
364 app_wrk = app_worker_get (s->app_wrk_index);
365 app = application_lookup (mp->client_index);
366 if (!(app_wrk && app && app->app_index == app_wrk->app_index))
368 clib_warning ("could not disconnect session: %llu app: %u",
369 mp->handle, mp->client_index);
373 a->handle = mp->handle;
374 a->app_index = app_wrk->wrk_index;
375 rv = vnet_disconnect_session (a);
377 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
378 SESSION_MQ_CTRL_EVT_RING,
380 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
381 clib_memset (evt, 0, sizeof (*evt));
382 evt->event_type = SESSION_CTRL_EVT_DISCONNECTED_REPLY;
383 rmp = (session_disconnected_reply_msg_t *) evt->data;
384 rmp->handle = mp->handle;
385 rmp->context = mp->context;
387 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
391 session_mq_disconnected_reply_handler (void *data)
393 session_disconnected_reply_msg_t *mp;
394 vnet_disconnect_args_t _a, *a = &_a;
397 mp = (session_disconnected_reply_msg_t *) data;
399 /* Client objected to disconnecting the session, log and continue */
402 clib_warning ("client retval %d", mp->retval);
406 /* Disconnect has been confirmed. Confirm close to transport */
407 app = application_lookup (mp->context);
410 a->handle = mp->handle;
411 a->app_index = app->app_index;
412 vnet_disconnect_session (a);
417 session_mq_worker_update_handler (void *data)
419 session_worker_update_msg_t *mp = (session_worker_update_msg_t *) data;
420 session_worker_update_reply_msg_t *rmp;
421 svm_msg_q_msg_t _msg, *msg = &_msg;
422 app_worker_t *app_wrk;
423 u32 owner_app_wrk_map;
424 session_event_t *evt;
428 app = application_lookup (mp->client_index);
431 if (!(s = session_get_from_handle_if_valid (mp->handle)))
433 clib_warning ("invalid handle %llu", mp->handle);
436 app_wrk = app_worker_get (s->app_wrk_index);
437 if (app_wrk->app_index != app->app_index)
439 clib_warning ("app %u does not own session %llu", app->app_index,
443 owner_app_wrk_map = app_wrk->wrk_map_index;
444 app_wrk = application_get_worker (app, mp->wrk_index);
446 /* This needs to come from the new owner */
447 if (mp->req_wrk_index == owner_app_wrk_map)
449 session_req_worker_update_msg_t *wump;
451 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
452 SESSION_MQ_CTRL_EVT_RING,
454 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
455 clib_memset (evt, 0, sizeof (*evt));
456 evt->event_type = SESSION_CTRL_EVT_REQ_WORKER_UPDATE;
457 wump = (session_req_worker_update_msg_t *) evt->data;
458 wump->session_handle = mp->handle;
459 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
463 app_worker_own_session (app_wrk, s);
468 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
469 SESSION_MQ_CTRL_EVT_RING,
471 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
472 clib_memset (evt, 0, sizeof (*evt));
473 evt->event_type = SESSION_CTRL_EVT_WORKER_UPDATE_REPLY;
474 rmp = (session_worker_update_reply_msg_t *) evt->data;
475 rmp->handle = mp->handle;
477 rmp->rx_fifo = fifo_segment_fifo_offset (s->rx_fifo);
479 rmp->tx_fifo = fifo_segment_fifo_offset (s->tx_fifo);
480 rmp->segment_handle = session_segment_handle (s);
481 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
484 * Retransmit messages that may have been lost
486 if (s->tx_fifo && !svm_fifo_is_empty (s->tx_fifo))
487 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
489 if (s->rx_fifo && !svm_fifo_is_empty (s->rx_fifo))
490 app_worker_lock_and_send_event (app_wrk, s, SESSION_IO_EVT_RX);
492 if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
493 app_worker_close_notify (app_wrk, s);
497 session_mq_app_wrk_rpc_handler (void *data)
499 session_app_wrk_rpc_msg_t *mp = (session_app_wrk_rpc_msg_t *) data;
500 svm_msg_q_msg_t _msg, *msg = &_msg;
501 session_app_wrk_rpc_msg_t *rmp;
502 app_worker_t *app_wrk;
503 session_event_t *evt;
506 app = application_lookup (mp->client_index);
510 app_wrk = application_get_worker (app, mp->wrk_index);
512 svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue,
513 SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT,
515 evt = svm_msg_q_msg_data (app_wrk->event_queue, msg);
516 clib_memset (evt, 0, sizeof (*evt));
517 evt->event_type = SESSION_CTRL_EVT_APP_WRK_RPC;
518 rmp = (session_app_wrk_rpc_msg_t *) evt->data;
519 clib_memcpy (rmp->data, mp->data, sizeof (mp->data));
520 svm_msg_q_add_and_unlock (app_wrk->event_queue, msg);
523 vlib_node_registration_t session_queue_node;
528 u32 server_thread_index;
529 } session_queue_trace_t;
531 /* packet trace format function */
533 format_session_queue_trace (u8 * s, va_list * args)
535 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
536 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
537 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
539 s = format (s, "session index %d thread index %d",
540 t->session_index, t->server_thread_index);
544 #define foreach_session_queue_error \
545 _(TX, "Packets transmitted") \
546 _(TIMER, "Timer events") \
547 _(NO_BUFFER, "Out of buffers")
551 #define _(sym,str) SESSION_QUEUE_ERROR_##sym,
552 foreach_session_queue_error
554 SESSION_QUEUE_N_ERROR,
555 } session_queue_error_t;
557 static char *session_queue_error_strings[] = {
558 #define _(sym,string) string,
559 foreach_session_queue_error
565 SESSION_TX_NO_BUFFERS = -2,
571 session_tx_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
572 u32 next_index, u32 * to_next, u16 n_segs,
573 session_t * s, u32 n_trace)
575 while (n_trace && n_segs)
577 vlib_buffer_t *b = vlib_get_buffer (vm, to_next[0]);
580 (vm, node, next_index, b, 1 /* follow_chain */ )))
582 session_queue_trace_t *t =
583 vlib_add_trace (vm, node, b, sizeof (*t));
584 t->session_index = s->session_index;
585 t->server_thread_index = s->thread_index;
591 vlib_set_trace_count (vm, node, n_trace);
595 session_tx_fifo_chain_tail (vlib_main_t * vm, session_tx_context_t * ctx,
596 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
598 vlib_buffer_t *chain_b, *prev_b;
599 u32 chain_bi0, to_deq, left_from_seg;
600 session_worker_t *wrk;
601 u16 len_to_deq, n_bytes_read;
604 wrk = session_main_get_worker (ctx->s->thread_index);
605 b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
606 b->total_length_not_including_first_buffer = 0;
609 left_from_seg = clib_min (ctx->sp.snd_mss - b->current_length,
611 to_deq = left_from_seg;
612 for (j = 1; j < ctx->n_bufs_per_seg; j++)
615 len_to_deq = clib_min (to_deq, ctx->deq_per_buf);
618 chain_bi0 = wrk->tx_buffers[*n_bufs];
619 chain_b = vlib_get_buffer (vm, chain_bi0);
620 chain_b->current_data = 0;
621 data = vlib_buffer_get_current (chain_b);
624 n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo,
625 ctx->sp.tx_offset, len_to_deq, data);
626 ctx->sp.tx_offset += n_bytes_read;
630 if (ctx->transport_vft->transport_options.tx_type ==
633 svm_fifo_t *f = ctx->s->tx_fifo;
634 session_dgram_hdr_t *hdr = &ctx->hdr;
638 deq_now = clib_min (hdr->data_length - hdr->data_offset,
640 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
641 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data);
642 ASSERT (n_bytes_read > 0);
644 hdr->data_offset += n_bytes_read;
645 if (hdr->data_offset == hdr->data_length)
647 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
648 svm_fifo_dequeue_drop (f, offset);
649 if (ctx->left_to_snd > n_bytes_read)
650 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
653 else if (ctx->left_to_snd == n_bytes_read)
654 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
655 sizeof (session_dgram_pre_hdr_t));
658 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
661 ASSERT (n_bytes_read == len_to_deq);
662 chain_b->current_length = n_bytes_read;
663 b->total_length_not_including_first_buffer += chain_b->current_length;
665 /* update previous buffer */
666 prev_b->next_buffer = chain_bi0;
667 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
669 /* update current buffer */
670 chain_b->next_buffer = 0;
672 to_deq -= n_bytes_read;
677 && b->total_length_not_including_first_buffer == left_from_seg);
678 ctx->left_to_snd -= left_from_seg;
682 session_tx_fill_buffer (vlib_main_t * vm, session_tx_context_t * ctx,
683 vlib_buffer_t * b, u16 * n_bufs, u8 peek_data)
690 * Start with the first buffer in chain
693 b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
696 data0 = vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
697 len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf);
701 n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo, ctx->sp.tx_offset,
703 ASSERT (n_bytes_read > 0);
704 /* Keep track of progress locally, transport is also supposed to
705 * increment it independently when pushing the header */
706 ctx->sp.tx_offset += n_bytes_read;
710 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
712 session_dgram_hdr_t *hdr = &ctx->hdr;
713 svm_fifo_t *f = ctx->s->tx_fifo;
717 ASSERT (hdr->data_length > hdr->data_offset);
718 deq_now = clib_min (hdr->data_length - hdr->data_offset,
720 offset = hdr->data_offset + SESSION_CONN_HDR_LEN;
721 n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0);
722 ASSERT (n_bytes_read > 0);
724 if (ctx->s->session_state == SESSION_STATE_LISTENING)
726 ip_copy (&ctx->tc->rmt_ip, &hdr->rmt_ip, ctx->tc->is_ip4);
727 ctx->tc->rmt_port = hdr->rmt_port;
729 hdr->data_offset += n_bytes_read;
730 if (hdr->data_offset == hdr->data_length)
732 offset = hdr->data_length + SESSION_CONN_HDR_LEN;
733 svm_fifo_dequeue_drop (f, offset);
734 if (ctx->left_to_snd > n_bytes_read)
735 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
738 else if (ctx->left_to_snd == n_bytes_read)
739 svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr,
740 sizeof (session_dgram_pre_hdr_t));
744 n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo,
746 ASSERT (n_bytes_read > 0);
749 b->current_length = n_bytes_read;
750 ctx->left_to_snd -= n_bytes_read;
753 * Fill in the remaining buffers in the chain, if any
755 if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd))
756 session_tx_fifo_chain_tail (vm, ctx, b, n_bufs, peek_data);
760 session_tx_not_ready (session_t * s, u8 peek_data)
764 if (PREDICT_TRUE (s->session_state == SESSION_STATE_READY))
766 /* Can retransmit for closed sessions but can't send new data if
767 * session is not ready or closed */
768 else if (s->session_state < SESSION_STATE_READY)
770 else if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)
772 /* Allow closed transports to still send custom packets.
773 * For instance, tcp may want to send acks in time-wait. */
774 if (s->session_state != SESSION_STATE_TRANSPORT_DELETED
775 && (s->flags & SESSION_F_CUSTOM_TX))
783 always_inline transport_connection_t *
784 session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data)
788 return ctx->transport_vft->get_connection (ctx->s->connection_index,
789 ctx->s->thread_index);
793 if (ctx->s->session_state == SESSION_STATE_LISTENING)
794 return ctx->transport_vft->get_listener (ctx->s->connection_index);
797 return ctx->transport_vft->get_connection (ctx->s->connection_index,
798 ctx->s->thread_index);
804 session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
805 u32 max_segs, u8 peek_data)
807 u32 n_bytes_per_buf, n_bytes_per_seg;
809 n_bytes_per_buf = vlib_buffer_get_default_data_size (vm);
810 ctx->max_dequeue = svm_fifo_max_dequeue_cons (ctx->s->tx_fifo);
814 /* Offset in rx fifo from where to peek data */
815 if (PREDICT_FALSE (ctx->sp.tx_offset >= ctx->max_dequeue))
817 ctx->max_len_to_snd = 0;
820 ctx->max_dequeue -= ctx->sp.tx_offset;
824 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
826 u32 len, chain_limit;
828 if (ctx->max_dequeue <= sizeof (ctx->hdr))
830 ctx->max_len_to_snd = 0;
834 svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
836 ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
837 len = ctx->hdr.data_length - ctx->hdr.data_offset;
839 /* Process multiple dgrams if smaller than min (buf_space, mss).
840 * This avoids handling multiple dgrams if they require buffer
842 chain_limit = clib_min (n_bytes_per_buf - TRANSPORT_MAX_HDRS_LEN,
844 if (ctx->hdr.data_length <= chain_limit)
846 u32 first_dgram_len, dgram_len, offset, max_offset;
847 session_dgram_hdr_t hdr;
849 ctx->sp.snd_mss = clib_min (ctx->sp.snd_mss, len);
850 offset = ctx->hdr.data_length + sizeof (session_dgram_hdr_t);
851 first_dgram_len = len;
852 max_offset = clib_min (ctx->max_dequeue, 16 << 10);
854 while (offset < max_offset)
856 svm_fifo_peek (ctx->s->tx_fifo, offset, sizeof (ctx->hdr),
858 ASSERT (hdr.data_length > hdr.data_offset);
859 dgram_len = hdr.data_length - hdr.data_offset;
860 if (len + dgram_len > ctx->max_dequeue
861 || first_dgram_len != dgram_len)
864 offset += sizeof (hdr) + hdr.data_length;
868 ctx->max_dequeue = len;
871 ASSERT (ctx->max_dequeue > 0);
873 /* Ensure we're not writing more than transport window allows */
874 if (ctx->max_dequeue < ctx->sp.snd_space)
876 /* Constrained by tx queue. Try to send only fully formed segments */
877 ctx->max_len_to_snd = (ctx->max_dequeue > ctx->sp.snd_mss) ?
878 (ctx->max_dequeue - (ctx->max_dequeue % ctx->sp.snd_mss)) :
884 /* Expectation is that snd_space0 is already a multiple of snd_mss */
885 ctx->max_len_to_snd = ctx->sp.snd_space;
888 /* Check if we're tx constrained by the node */
889 ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->sp.snd_mss);
890 if (ctx->n_segs_per_evt > max_segs)
892 ctx->n_segs_per_evt = max_segs;
893 ctx->max_len_to_snd = max_segs * ctx->sp.snd_mss;
896 ASSERT (n_bytes_per_buf > TRANSPORT_MAX_HDRS_LEN);
897 if (ctx->n_segs_per_evt > 1)
899 u32 n_bytes_last_seg, n_bufs_last_seg;
901 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->sp.snd_mss;
902 n_bytes_last_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd
903 - ((ctx->n_segs_per_evt - 1) * ctx->sp.snd_mss);
904 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
905 n_bufs_last_seg = ceil ((f64) n_bytes_last_seg / n_bytes_per_buf);
906 ctx->n_bufs_needed = ((ctx->n_segs_per_evt - 1) * ctx->n_bufs_per_seg)
911 n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd;
912 ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
913 ctx->n_bufs_needed = ctx->n_bufs_per_seg;
916 ctx->deq_per_buf = clib_min (ctx->sp.snd_mss, n_bytes_per_buf);
917 ctx->deq_per_first_buf = clib_min (ctx->sp.snd_mss,
919 TRANSPORT_MAX_HDRS_LEN);
923 session_tx_maybe_reschedule (session_worker_t * wrk,
924 session_tx_context_t * ctx,
925 session_evt_elt_t * elt)
927 session_t *s = ctx->s;
929 svm_fifo_unset_event (s->tx_fifo);
930 if (svm_fifo_max_dequeue_cons (s->tx_fifo) > ctx->sp.tx_offset)
931 if (svm_fifo_set_event (s->tx_fifo))
932 session_evt_add_head_old (wrk, elt);
936 session_tx_fifo_read_and_snd_i (session_worker_t * wrk,
937 vlib_node_runtime_t * node,
938 session_evt_elt_t * elt,
939 int *n_tx_packets, u8 peek_data)
941 u32 n_trace, n_left, pbi, next_index, max_burst;
942 session_tx_context_t *ctx = &wrk->ctx;
943 session_main_t *smm = &session_main;
944 session_event_t *e = &elt->evt;
945 vlib_main_t *vm = wrk->vm;
946 transport_proto_t tp;
950 if (PREDICT_FALSE ((rv = session_tx_not_ready (ctx->s, peek_data))))
953 session_evt_add_old (wrk, elt);
954 return SESSION_TX_NO_DATA;
957 next_index = smm->session_type_to_next[ctx->s->session_type];
958 max_burst = SESSION_NODE_FRAME_SIZE - *n_tx_packets;
960 tp = session_get_transport_proto (ctx->s);
961 ctx->transport_vft = transport_protocol_get_vft (tp);
962 ctx->tc = session_tx_get_transport (ctx, peek_data);
964 if (PREDICT_FALSE (e->event_type == SESSION_IO_EVT_TX_FLUSH))
966 if (ctx->transport_vft->flush_data)
967 ctx->transport_vft->flush_data (ctx->tc);
968 e->event_type = SESSION_IO_EVT_TX;
971 if (ctx->s->flags & SESSION_F_CUSTOM_TX)
974 ctx->s->flags &= ~SESSION_F_CUSTOM_TX;
975 ctx->sp.max_burst_size = max_burst;
976 n_custom_tx = ctx->transport_vft->custom_tx (ctx->tc, &ctx->sp);
977 *n_tx_packets += n_custom_tx;
979 (ctx->s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
980 return SESSION_TX_OK;
981 max_burst -= n_custom_tx;
982 if (!max_burst || (ctx->s->flags & SESSION_F_CUSTOM_TX))
984 session_evt_add_old (wrk, elt);
985 return SESSION_TX_OK;
989 transport_connection_snd_params (ctx->tc, &ctx->sp);
991 if (!ctx->sp.snd_space)
993 /* If the deschedule flag was set, remove session from scheduler.
994 * Transport is responsible for rescheduling this session. */
995 if (ctx->sp.flags & TRANSPORT_SND_F_DESCHED)
996 transport_connection_deschedule (ctx->tc);
997 /* Request to postpone the session, e.g., zero-wnd and transport
998 * is not currently probing */
999 else if (ctx->sp.flags & TRANSPORT_SND_F_POSTPONE)
1000 session_evt_add_old (wrk, elt);
1001 /* This flow queue is "empty" so it should be re-evaluated before
1002 * the ones that have data to send. */
1004 session_evt_add_head_old (wrk, elt);
1006 return SESSION_TX_NO_DATA;
1009 if (transport_connection_is_tx_paced (ctx->tc))
1011 u32 snd_space = transport_connection_tx_pacer_burst (ctx->tc);
1012 if (snd_space < TRANSPORT_PACER_MIN_BURST)
1014 session_evt_add_head_old (wrk, elt);
1015 return SESSION_TX_NO_DATA;
1017 snd_space = clib_min (ctx->sp.snd_space, snd_space);
1018 ctx->sp.snd_space = snd_space >= ctx->sp.snd_mss ?
1019 snd_space - snd_space % ctx->sp.snd_mss : snd_space;
1022 /* Check how much we can pull. */
1023 session_tx_set_dequeue_params (vm, ctx, max_burst, peek_data);
1025 if (PREDICT_FALSE (!ctx->max_len_to_snd))
1027 transport_connection_tx_pacer_reset_bucket (ctx->tc, 0);
1028 session_tx_maybe_reschedule (wrk, ctx, elt);
1029 return SESSION_TX_NO_DATA;
1032 vec_validate_aligned (wrk->tx_buffers, ctx->n_bufs_needed - 1,
1033 CLIB_CACHE_LINE_BYTES);
1034 n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, ctx->n_bufs_needed);
1035 if (PREDICT_FALSE (n_bufs < ctx->n_bufs_needed))
1038 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1039 session_evt_add_head_old (wrk, elt);
1040 vlib_node_increment_counter (wrk->vm, node->node_index,
1041 SESSION_QUEUE_ERROR_NO_BUFFER, 1);
1042 return SESSION_TX_NO_BUFFERS;
1045 if (transport_connection_is_tx_paced (ctx->tc))
1046 transport_connection_tx_pacer_update_bytes (ctx->tc, ctx->max_len_to_snd);
1048 ctx->left_to_snd = ctx->max_len_to_snd;
1049 n_left = ctx->n_segs_per_evt;
1053 vlib_buffer_t *b0, *b1;
1056 pbi = wrk->tx_buffers[n_bufs - 3];
1057 pb = vlib_get_buffer (vm, pbi);
1058 vlib_prefetch_buffer_header (pb, STORE);
1059 pbi = wrk->tx_buffers[n_bufs - 4];
1060 pb = vlib_get_buffer (vm, pbi);
1061 vlib_prefetch_buffer_header (pb, STORE);
1063 bi0 = wrk->tx_buffers[--n_bufs];
1064 bi1 = wrk->tx_buffers[--n_bufs];
1066 b0 = vlib_get_buffer (vm, bi0);
1067 b1 = vlib_get_buffer (vm, bi1);
1069 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
1070 session_tx_fill_buffer (vm, ctx, b1, &n_bufs, peek_data);
1072 ctx->transport_vft->push_header (ctx->tc, b0);
1073 ctx->transport_vft->push_header (ctx->tc, b1);
1077 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1078 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
1080 vec_add1 (wrk->pending_tx_buffers, bi0);
1081 vec_add1 (wrk->pending_tx_buffers, bi1);
1082 vec_add1 (wrk->pending_tx_nexts, next_index);
1083 vec_add1 (wrk->pending_tx_nexts, next_index);
1092 pbi = wrk->tx_buffers[n_bufs - 2];
1093 pb = vlib_get_buffer (vm, pbi);
1094 vlib_prefetch_buffer_header (pb, STORE);
1097 bi0 = wrk->tx_buffers[--n_bufs];
1098 b0 = vlib_get_buffer (vm, bi0);
1099 session_tx_fill_buffer (vm, ctx, b0, &n_bufs, peek_data);
1101 /* Ask transport to push header after current_length and
1102 * total_length_not_including_first_buffer are updated */
1103 ctx->transport_vft->push_header (ctx->tc, b0);
1107 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1109 vec_add1 (wrk->pending_tx_buffers, bi0);
1110 vec_add1 (wrk->pending_tx_nexts, next_index);
1113 if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node)) > 0))
1114 session_tx_trace_frame (vm, node, next_index, wrk->pending_tx_buffers,
1115 ctx->n_segs_per_evt, ctx->s, n_trace);
1117 if (PREDICT_FALSE (n_bufs))
1118 vlib_buffer_free (vm, wrk->tx_buffers, n_bufs);
1120 *n_tx_packets += ctx->n_segs_per_evt;
1122 SESSION_EVT (SESSION_EVT_DEQ, ctx->s, ctx->max_len_to_snd, ctx->max_dequeue,
1123 ctx->s->tx_fifo->has_event, wrk->last_vlib_time);
1125 ASSERT (ctx->left_to_snd == 0);
1127 /* If we couldn't dequeue all bytes reschedule as old flow. Otherwise,
1128 * check if application enqueued more data and reschedule accordingly */
1129 if (ctx->max_len_to_snd < ctx->max_dequeue)
1130 session_evt_add_old (wrk, elt);
1132 session_tx_maybe_reschedule (wrk, ctx, elt);
1136 u32 n_dequeued = ctx->max_len_to_snd;
1137 if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM)
1138 n_dequeued += ctx->n_segs_per_evt * SESSION_CONN_HDR_LEN;
1139 if (svm_fifo_needs_deq_ntf (ctx->s->tx_fifo, n_dequeued))
1140 session_dequeue_notify (ctx->s);
1142 return SESSION_TX_OK;
1146 session_tx_fifo_peek_and_snd (session_worker_t * wrk,
1147 vlib_node_runtime_t * node,
1148 session_evt_elt_t * e, int *n_tx_packets)
1150 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 1);
1154 session_tx_fifo_dequeue_and_snd (session_worker_t * wrk,
1155 vlib_node_runtime_t * node,
1156 session_evt_elt_t * e, int *n_tx_packets)
1158 return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 0);
1162 session_tx_fifo_dequeue_internal (session_worker_t * wrk,
1163 vlib_node_runtime_t * node,
1164 session_evt_elt_t * elt, int *n_tx_packets)
1166 transport_send_params_t *sp = &wrk->ctx.sp;
1167 session_t *s = wrk->ctx.s;
1170 if (PREDICT_FALSE (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED))
1173 /* Clear custom-tx flag used to request reschedule for tx */
1174 s->flags &= ~SESSION_F_CUSTOM_TX;
1176 sp->max_burst_size = clib_min (SESSION_NODE_FRAME_SIZE - *n_tx_packets,
1177 TRANSPORT_PACER_MAX_BURST_PKTS);
1179 n_packets = transport_custom_tx (session_get_transport_proto (s), s, sp);
1180 *n_tx_packets += n_packets;
1182 if (s->flags & SESSION_F_CUSTOM_TX)
1184 session_evt_add_old (wrk, elt);
1186 else if (!(sp->flags & TRANSPORT_SND_F_DESCHED))
1188 svm_fifo_unset_event (s->tx_fifo);
1189 if (svm_fifo_max_dequeue_cons (s->tx_fifo))
1190 if (svm_fifo_set_event (s->tx_fifo))
1191 session_evt_add_head_old (wrk, elt);
1194 if (sp->max_burst_size &&
1195 svm_fifo_needs_deq_ntf (s->tx_fifo, sp->max_burst_size))
1196 session_dequeue_notify (s);
1201 always_inline session_t *
1202 session_event_get_session (session_worker_t * wrk, session_event_t * e)
1204 if (PREDICT_FALSE (pool_is_free_index (wrk->sessions, e->session_index)))
1207 ASSERT (session_is_valid (e->session_index, wrk->vm->thread_index));
1208 return pool_elt_at_index (wrk->sessions, e->session_index);
1212 session_event_dispatch_ctrl (session_worker_t * wrk, session_evt_elt_t * elt)
1214 clib_llist_index_t ei;
1215 void (*fp) (void *);
1219 ei = clib_llist_entry_index (wrk->event_elts, elt);
1222 switch (e->event_type)
1224 case SESSION_CTRL_EVT_RPC:
1225 fp = e->rpc_args.fp;
1226 (*fp) (e->rpc_args.arg);
1228 case SESSION_CTRL_EVT_CLOSE:
1229 s = session_get_from_handle_if_valid (e->session_handle);
1230 if (PREDICT_FALSE (!s))
1232 session_transport_close (s);
1234 case SESSION_CTRL_EVT_RESET:
1235 s = session_get_from_handle_if_valid (e->session_handle);
1236 if (PREDICT_FALSE (!s))
1238 session_transport_reset (s);
1240 case SESSION_CTRL_EVT_LISTEN:
1241 session_mq_listen_handler (session_evt_ctrl_data (wrk, elt));
1243 case SESSION_CTRL_EVT_LISTEN_URI:
1244 session_mq_listen_uri_handler (session_evt_ctrl_data (wrk, elt));
1246 case SESSION_CTRL_EVT_UNLISTEN:
1247 session_mq_unlisten_handler (session_evt_ctrl_data (wrk, elt));
1249 case SESSION_CTRL_EVT_CONNECT:
1250 session_mq_connect_handler (session_evt_ctrl_data (wrk, elt));
1252 case SESSION_CTRL_EVT_CONNECT_URI:
1253 session_mq_connect_uri_handler (session_evt_ctrl_data (wrk, elt));
1255 case SESSION_CTRL_EVT_DISCONNECT:
1256 session_mq_disconnect_handler (session_evt_ctrl_data (wrk, elt));
1258 case SESSION_CTRL_EVT_DISCONNECTED:
1259 session_mq_disconnected_handler (session_evt_ctrl_data (wrk, elt));
1261 case SESSION_CTRL_EVT_ACCEPTED_REPLY:
1262 session_mq_accepted_reply_handler (session_evt_ctrl_data (wrk, elt));
1264 case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
1265 session_mq_disconnected_reply_handler (session_evt_ctrl_data (wrk,
1268 case SESSION_CTRL_EVT_RESET_REPLY:
1269 session_mq_reset_reply_handler (session_evt_ctrl_data (wrk, elt));
1271 case SESSION_CTRL_EVT_WORKER_UPDATE:
1272 session_mq_worker_update_handler (session_evt_ctrl_data (wrk, elt));
1274 case SESSION_CTRL_EVT_APP_DETACH:
1275 app_mq_detach_handler (session_evt_ctrl_data (wrk, elt));
1277 case SESSION_CTRL_EVT_APP_WRK_RPC:
1278 session_mq_app_wrk_rpc_handler (session_evt_ctrl_data (wrk, elt));
1281 clib_warning ("unhandled event type %d", e->event_type);
1284 /* Regrab elements in case pool moved */
1285 elt = pool_elt_at_index (wrk->event_elts, ei);
1286 if (!clib_llist_elt_is_linked (elt, evt_list))
1289 if (e->event_type >= SESSION_CTRL_EVT_BOUND)
1290 session_evt_ctrl_data_free (wrk, elt);
1291 session_evt_elt_free (wrk, elt);
1293 SESSION_EVT (SESSION_EVT_COUNTS, CNT_CTRL_EVTS, 1, wrk);
1297 session_event_dispatch_io (session_worker_t * wrk, vlib_node_runtime_t * node,
1298 session_evt_elt_t * elt, int *n_tx_packets)
1300 session_main_t *smm = &session_main;
1301 app_worker_t *app_wrk;
1302 clib_llist_index_t ei;
1306 ei = clib_llist_entry_index (wrk->event_elts, elt);
1309 switch (e->event_type)
1311 case SESSION_IO_EVT_TX_FLUSH:
1312 case SESSION_IO_EVT_TX:
1313 s = session_event_get_session (wrk, e);
1314 if (PREDICT_FALSE (!s))
1316 CLIB_PREFETCH (s->tx_fifo, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
1318 /* Spray packets in per session type frames, since they go to
1319 * different nodes */
1320 (smm->session_tx_fns[s->session_type]) (wrk, node, elt, n_tx_packets);
1322 case SESSION_IO_EVT_RX:
1323 s = session_event_get_session (wrk, e);
1326 transport_app_rx_evt (session_get_transport_proto (s),
1327 s->connection_index, s->thread_index);
1329 case SESSION_IO_EVT_BUILTIN_RX:
1330 s = session_event_get_session (wrk, e);
1331 if (PREDICT_FALSE (!s || s->session_state >= SESSION_STATE_CLOSING))
1333 svm_fifo_unset_event (s->rx_fifo);
1334 app_wrk = app_worker_get (s->app_wrk_index);
1335 app_worker_builtin_rx (app_wrk, s);
1337 case SESSION_IO_EVT_BUILTIN_TX:
1338 s = session_get_from_handle_if_valid (e->session_handle);
1340 if (PREDICT_TRUE (s != 0))
1341 session_tx_fifo_dequeue_internal (wrk, node, elt, n_tx_packets);
1344 clib_warning ("unhandled event type %d", e->event_type);
1347 SESSION_EVT (SESSION_IO_EVT_COUNTS, e->event_type, 1, wrk);
1349 /* Regrab elements in case pool moved */
1350 elt = pool_elt_at_index (wrk->event_elts, ei);
1351 if (!clib_llist_elt_is_linked (elt, evt_list))
1352 session_evt_elt_free (wrk, elt);
1356 static const u32 session_evt_msg_sizes[] = {
1357 #define _(symc, sym) \
1358 [SESSION_CTRL_EVT_ ## symc] = sizeof (session_ ## sym ##_msg_t),
1359 foreach_session_ctrl_evt
1365 session_evt_add_to_list (session_worker_t * wrk, session_event_t * evt)
1367 session_evt_elt_t *elt;
1369 if (evt->event_type >= SESSION_CTRL_EVT_RPC)
1371 elt = session_evt_alloc_ctrl (wrk);
1372 if (evt->event_type >= SESSION_CTRL_EVT_BOUND)
1374 elt->evt.ctrl_data_index = session_evt_ctrl_data_alloc (wrk);
1375 elt->evt.event_type = evt->event_type;
1376 clib_memcpy_fast (session_evt_ctrl_data (wrk, elt), evt->data,
1377 session_evt_msg_sizes[evt->event_type]);
1381 /* Internal control events fit into io events footprint */
1382 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1387 elt = session_evt_alloc_new (wrk);
1388 clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt));
1393 session_flush_pending_tx_buffers (session_worker_t * wrk,
1394 vlib_node_runtime_t * node)
1396 vlib_buffer_enqueue_to_next (wrk->vm, node, wrk->pending_tx_buffers,
1397 wrk->pending_tx_nexts,
1398 vec_len (wrk->pending_tx_nexts));
1399 vec_reset_length (wrk->pending_tx_buffers);
1400 vec_reset_length (wrk->pending_tx_nexts);
1404 session_wrk_handle_mq (session_worker_t *wrk, svm_msg_q_t *mq)
1406 svm_msg_q_msg_t _msg, *msg = &_msg;
1407 u32 i, n_to_dequeue = 0;
1408 session_event_t *evt;
1410 n_to_dequeue = svm_msg_q_size (mq);
1411 for (i = 0; i < n_to_dequeue; i++)
1413 svm_msg_q_sub_raw (mq, msg);
1414 evt = svm_msg_q_msg_data (mq, msg);
1415 session_evt_add_to_list (wrk, evt);
1416 svm_msg_q_free_msg (mq, msg);
1419 return n_to_dequeue;
1423 session_wrk_timerfd_update (session_worker_t *wrk, u64 time_ns)
1425 struct itimerspec its;
1427 its.it_value.tv_sec = 0;
1428 its.it_value.tv_nsec = time_ns;
1429 its.it_interval.tv_sec = 0;
1430 its.it_interval.tv_nsec = its.it_value.tv_nsec;
1432 if (timerfd_settime (wrk->timerfd, 0, &its, NULL) == -1)
1433 clib_warning ("timerfd_settime");
1437 session_wrk_tfd_timeout (session_wrk_state_t state, u32 thread_index)
1439 if (state == SESSION_WRK_INTERRUPT)
1440 return thread_index ? 1e6 : vlib_num_workers () ? 5e8 : 1e6;
1441 else if (state == SESSION_WRK_IDLE)
1442 return thread_index ? 1e8 : vlib_num_workers () ? 5e8 : 1e8;
1448 session_wrk_state_update (session_worker_t *wrk, session_wrk_state_t state)
1453 time_ns = session_wrk_tfd_timeout (state, wrk->vm->thread_index);
1454 session_wrk_timerfd_update (wrk, time_ns);
1458 session_wrk_update_state (session_worker_t *wrk)
1460 vlib_main_t *vm = wrk->vm;
1462 if (wrk->state == SESSION_WRK_POLLING)
1464 if (pool_elts (wrk->event_elts) == 3 &&
1465 vlib_last_vectors_per_main_loop (vm) < 1)
1467 session_wrk_state_update (wrk, SESSION_WRK_INTERRUPT);
1468 vlib_node_set_state (vm, session_queue_node.index,
1469 VLIB_NODE_STATE_INTERRUPT);
1472 else if (wrk->state == SESSION_WRK_INTERRUPT)
1474 if (pool_elts (wrk->event_elts) > 3 ||
1475 vlib_last_vectors_per_main_loop (vm) > 1)
1477 session_wrk_state_update (wrk, SESSION_WRK_POLLING);
1478 vlib_node_set_state (vm, session_queue_node.index,
1479 VLIB_NODE_STATE_POLLING);
1481 else if (PREDICT_FALSE (!pool_elts (wrk->sessions)))
1483 session_wrk_state_update (wrk, SESSION_WRK_IDLE);
1488 if (pool_elts (wrk->event_elts))
1490 session_wrk_state_update (wrk, SESSION_WRK_INTERRUPT);
1496 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1497 vlib_frame_t * frame)
1499 u32 thread_index = vm->thread_index, __clib_unused n_evts;
1500 session_evt_elt_t *elt, *ctrl_he, *new_he, *old_he;
1501 session_main_t *smm = vnet_get_session_main ();
1502 session_worker_t *wrk = &smm->wrk[thread_index];
1503 clib_llist_index_t ei, next_ei, old_ti;
1506 SESSION_EVT (SESSION_EVT_DISPATCH_START, wrk);
1508 session_wrk_update_time (wrk, vlib_time_now (vm));
1511 * Update transport time
1513 transport_update_time (wrk->last_vlib_time, thread_index);
1514 n_tx_packets = vec_len (wrk->pending_tx_buffers);
1515 SESSION_EVT (SESSION_EVT_DSP_CNTRS, UPDATE_TIME, wrk);
1518 * Dequeue new internal mq events
1521 n_evts = session_wrk_handle_mq (wrk, wrk->vpp_event_queue);
1522 SESSION_EVT (SESSION_EVT_DSP_CNTRS, MQ_DEQ, wrk, n_evts);
1525 * Handle control events
1528 ctrl_he = pool_elt_at_index (wrk->event_elts, wrk->ctrl_head);
1530 clib_llist_foreach_safe (wrk->event_elts, evt_list, ctrl_he, elt, ({
1531 clib_llist_remove (wrk->event_elts, evt_list, elt);
1532 session_event_dispatch_ctrl (wrk, elt);
1535 SESSION_EVT (SESSION_EVT_DSP_CNTRS, CTRL_EVTS, wrk);
1538 * Handle the new io events.
1541 new_he = pool_elt_at_index (wrk->event_elts, wrk->new_head);
1542 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1543 old_ti = clib_llist_prev_index (old_he, evt_list);
1545 ei = clib_llist_next_index (new_he, evt_list);
1546 while (ei != wrk->new_head && n_tx_packets < SESSION_NODE_FRAME_SIZE)
1548 elt = pool_elt_at_index (wrk->event_elts, ei);
1549 ei = clib_llist_next_index (elt, evt_list);
1550 clib_llist_remove (wrk->event_elts, evt_list, elt);
1551 session_event_dispatch_io (wrk, node, elt, &n_tx_packets);
1554 SESSION_EVT (SESSION_EVT_DSP_CNTRS, NEW_IO_EVTS, wrk);
1557 * Handle the old io events, if we had any prior to processing the new ones
1560 if (old_ti != wrk->old_head)
1562 old_he = pool_elt_at_index (wrk->event_elts, wrk->old_head);
1563 ei = clib_llist_next_index (old_he, evt_list);
1565 while (n_tx_packets < SESSION_NODE_FRAME_SIZE)
1567 elt = pool_elt_at_index (wrk->event_elts, ei);
1568 next_ei = clib_llist_next_index (elt, evt_list);
1569 clib_llist_remove (wrk->event_elts, evt_list, elt);
1571 session_event_dispatch_io (wrk, node, elt, &n_tx_packets);
1580 SESSION_EVT (SESSION_EVT_DSP_CNTRS, OLD_IO_EVTS, wrk);
1582 if (vec_len (wrk->pending_tx_buffers))
1583 session_flush_pending_tx_buffers (wrk, node);
1585 vlib_node_increment_counter (vm, session_queue_node.index,
1586 SESSION_QUEUE_ERROR_TX, n_tx_packets);
1588 SESSION_EVT (SESSION_EVT_DISPATCH_END, wrk, n_tx_packets);
1590 if (wrk->flags & SESSION_WRK_F_ADAPTIVE)
1591 session_wrk_update_state (wrk);
1593 return n_tx_packets;
1597 VLIB_REGISTER_NODE (session_queue_node) =
1599 .function = session_queue_node_fn,
1600 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
1601 .name = "session-queue",
1602 .format_trace = format_session_queue_trace,
1603 .type = VLIB_NODE_TYPE_INPUT,
1604 .n_errors = ARRAY_LEN (session_queue_error_strings),
1605 .error_strings = session_queue_error_strings,
1606 .state = VLIB_NODE_STATE_DISABLED,
1610 static clib_error_t *
1611 session_wrk_tfd_read_ready (clib_file_t *cf)
1613 session_worker_t *wrk = session_main_get_worker (cf->private_data);
1617 vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
1618 rv = read (wrk->timerfd, &buf, sizeof (buf));
1619 if (rv < 0 && errno != EAGAIN)
1620 clib_unix_warning ("failed");
1624 static clib_error_t *
1625 session_wrk_tfd_write_ready (clib_file_t *cf)
1631 session_wrk_enable_adaptive_mode (session_worker_t *wrk)
1633 u32 thread_index = wrk->vm->thread_index;
1634 clib_file_t template = { 0 };
1636 if ((wrk->timerfd = timerfd_create (CLOCK_MONOTONIC, TFD_NONBLOCK)) < 0)
1637 clib_warning ("timerfd_create");
1639 template.read_function = session_wrk_tfd_read_ready;
1640 template.write_function = session_wrk_tfd_write_ready;
1641 template.file_descriptor = wrk->timerfd;
1642 template.private_data = thread_index;
1643 template.polling_thread_index = thread_index;
1644 template.description = format (0, "session-wrk-tfd-%u", thread_index);
1646 wrk->timerfd_file = clib_file_add (&file_main, &template);
1647 wrk->flags |= SESSION_WRK_F_ADAPTIVE;
1650 static clib_error_t *
1651 session_queue_exit (vlib_main_t * vm)
1653 if (vlib_get_n_threads () < 2)
1657 * Shut off (especially) worker-thread session nodes.
1658 * Otherwise, vpp can crash as the main thread unmaps the
1661 vlib_worker_thread_barrier_sync (vm);
1662 session_node_enable_disable (0 /* is_enable */ );
1663 vlib_worker_thread_barrier_release (vm);
1667 VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit);
1670 session_queue_run_on_main (vlib_main_t * vm)
1672 vlib_node_runtime_t *node;
1674 node = vlib_node_get_runtime (vm, session_queue_node.index);
1675 return session_queue_node_fn (vm, node, 0);
1679 session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
1682 uword *event_data = 0;
1688 vlib_process_wait_for_event_or_clock (vm, timeout);
1689 event_type = vlib_process_get_events (vm, (uword **) & event_data);
1693 case SESSION_Q_PROCESS_RUN_ON_MAIN:
1694 /* Run session queue node on main thread */
1695 session_queue_run_on_main (vm);
1697 case SESSION_Q_PROCESS_STOP:
1698 vlib_node_set_state (vm, session_queue_process_node.index,
1699 VLIB_NODE_STATE_DISABLED);
1703 /* Timed out. Run on main to ensure all events are handled */
1704 session_queue_run_on_main (vm);
1707 vec_reset_length (event_data);
1713 VLIB_REGISTER_NODE (session_queue_process_node) =
1715 .function = session_queue_process,
1716 .type = VLIB_NODE_TYPE_PROCESS,
1717 .name = "session-queue-process",
1718 .state = VLIB_NODE_STATE_DISABLED,
1722 static_always_inline uword
1723 session_queue_pre_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1724 vlib_frame_t * frame)
1726 session_main_t *sm = &session_main;
1727 if (!sm->wrk[0].vpp_event_queue)
1729 node = vlib_node_get_runtime (vm, session_queue_node.index);
1730 return session_queue_node_fn (vm, node, frame);
1734 VLIB_REGISTER_NODE (session_queue_pre_input_node) =
1736 .function = session_queue_pre_input_inline,
1737 .type = VLIB_NODE_TYPE_PRE_INPUT,
1738 .name = "session-queue-main",
1739 .state = VLIB_NODE_STATE_DISABLED,
1744 * fd.io coding-style-patch-verification: ON
1747 * eval: (c-set-style "gnu")