2 * Copyright (c) 2017 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 <vnet/tcp/tcp.h>
20 #include <vppinfra/elog.h>
21 #include <vnet/session/application.h>
22 #include <vnet/session/session_debug.h>
23 #include <vlibmemory/unix_shared_memory_queue.h>
25 vlib_node_registration_t session_queue_node;
30 u32 server_thread_index;
31 } session_queue_trace_t;
33 /* packet trace format function */
35 format_session_queue_trace (u8 * s, va_list * args)
37 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
38 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
39 session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *);
41 s = format (s, "SESSION_QUEUE: session index %d, server thread index %d",
42 t->session_index, t->server_thread_index);
46 vlib_node_registration_t session_queue_node;
48 #define foreach_session_queue_error \
49 _(TX, "Packets transmitted") \
50 _(TIMER, "Timer events")
54 #define _(sym,str) SESSION_QUEUE_ERROR_##sym,
55 foreach_session_queue_error
57 SESSION_QUEUE_N_ERROR,
58 } session_queue_error_t;
60 static char *session_queue_error_strings[] = {
61 #define _(sym,string) string,
62 foreach_session_queue_error
66 static u32 session_type_to_next[] = {
67 SESSION_QUEUE_NEXT_TCP_IP4_OUTPUT,
68 SESSION_QUEUE_NEXT_IP4_LOOKUP,
69 SESSION_QUEUE_NEXT_TCP_IP6_OUTPUT,
70 SESSION_QUEUE_NEXT_IP6_LOOKUP,
74 session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node,
75 session_manager_main_t * smm,
76 session_fifo_event_t * e0,
77 stream_session_t * s0, u32 thread_index,
78 int *n_tx_packets, u8 peek_data)
80 u32 n_trace = vlib_get_trace_count (vm, node);
81 u32 left_to_snd0, max_len_to_snd0, len_to_deq0, n_bufs, snd_space0;
82 u32 n_frame_bytes, n_frames_per_evt;
83 transport_connection_t *tc0;
84 transport_proto_vft_t *transport_vft;
85 u32 next_index, next0, *to_next, n_left_to_next, bi0;
87 u32 rx_offset = 0, max_dequeue0;
92 next_index = next0 = session_type_to_next[s0->session_type];
94 transport_vft = session_get_transport_vft (s0->session_type);
95 tc0 = transport_vft->get_connection (s0->connection_index, thread_index);
97 /* Make sure we have space to send and there's something to dequeue */
98 snd_space0 = transport_vft->send_space (tc0);
99 snd_mss0 = transport_vft->send_mss (tc0);
101 /* Can't make any progress */
102 if (snd_space0 == 0 || snd_mss0 == 0)
104 vec_add1 (smm->evts_partially_read[thread_index], *e0);
110 /* Offset in rx fifo from where to peek data */
111 rx_offset = transport_vft->tx_fifo_offset (tc0);
114 /* Check how much we can pull. If buffering, subtract the offset */
115 max_dequeue0 = svm_fifo_max_dequeue (s0->server_tx_fifo) - rx_offset;
117 /* Allow enqueuing of a new event */
118 svm_fifo_unset_event (s0->server_tx_fifo);
120 /* Nothing to read return */
121 if (max_dequeue0 == 0)
126 /* Ensure we're not writing more than transport window allows */
127 max_len_to_snd0 = clib_min (max_dequeue0, snd_space0);
129 /* TODO check if transport is willing to send len_to_snd0
132 n_frame_bytes = snd_mss0 * VLIB_FRAME_SIZE;
133 n_frames_per_evt = ceil ((double) max_len_to_snd0 / n_frame_bytes);
135 n_bufs = vec_len (smm->tx_buffers[thread_index]);
136 left_to_snd0 = max_len_to_snd0;
137 for (i = 0; i < n_frames_per_evt; i++)
139 /* Make sure we have at least one full frame of buffers ready */
140 if (PREDICT_FALSE (n_bufs < VLIB_FRAME_SIZE))
142 vec_validate (smm->tx_buffers[thread_index],
143 n_bufs + VLIB_FRAME_SIZE - 1);
145 vlib_buffer_alloc (vm, &smm->tx_buffers[thread_index][n_bufs],
149 * XXX 0.9 because when debugging we might not get a full frame */
150 if (PREDICT_FALSE (n_bufs < 0.9 * VLIB_FRAME_SIZE))
152 if (svm_fifo_set_event (s0->server_tx_fifo))
154 vec_add1 (smm->evts_partially_read[thread_index], *e0);
159 _vec_len (smm->tx_buffers[thread_index]) = n_bufs;
162 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
163 while (left_to_snd0 && n_left_to_next)
165 /* Get free buffer */
167 bi0 = smm->tx_buffers[thread_index][n_bufs];
168 _vec_len (smm->tx_buffers[thread_index]) = n_bufs;
170 b0 = vlib_get_buffer (vm, bi0);
172 b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID
173 | VNET_BUFFER_LOCALLY_ORIGINATED;
174 b0->current_data = 0;
176 /* RX on the local interface. tx in default fib */
177 vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
178 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
180 /* usual speculation, or the enqueue_x1 macro will barf */
185 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
186 if (PREDICT_FALSE (n_trace > 0))
188 session_queue_trace_t *t0;
189 vlib_trace_buffer (vm, node, next_index, b0,
190 1 /* follow_chain */ );
191 vlib_set_trace_count (vm, node, --n_trace);
192 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
193 t0->session_index = s0->session_index;
194 t0->server_thread_index = s0->thread_index;
197 len_to_deq0 = (left_to_snd0 < snd_mss0) ? left_to_snd0 : snd_mss0;
200 SESSION_EVT_DBG(SESSION_EVT_DEQ, s0, ({
201 ed->data[0] = e0->event_id;
202 ed->data[1] = max_dequeue0;
203 ed->data[2] = len_to_deq0;
204 ed->data[3] = left_to_snd0;
208 /* Make room for headers */
209 data0 = vlib_buffer_make_headroom (b0, MAX_HDRS_LEN);
212 * TODO 1) peek instead of dequeue
213 * 2) buffer chains */
216 n_bytes_read = svm_fifo_peek (s0->server_tx_fifo, s0->pid,
217 rx_offset, len_to_deq0, data0);
218 if (n_bytes_read <= 0)
221 /* Keep track of progress locally, transport is also supposed to
222 * increment it independently when pushing the header */
223 rx_offset += n_bytes_read;
227 n_bytes_read = svm_fifo_dequeue_nowait (s0->server_tx_fifo,
228 s0->pid, len_to_deq0,
230 if (n_bytes_read <= 0)
234 b0->current_length = n_bytes_read;
236 /* Ask transport to push header */
237 transport_vft->push_header (tc0, b0);
239 left_to_snd0 -= n_bytes_read;
240 *n_tx_packets = *n_tx_packets + 1;
242 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
243 to_next, n_left_to_next,
246 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
249 /* If we couldn't dequeue all bytes mark as partially read */
250 if (max_len_to_snd0 < max_dequeue0)
252 /* If we don't already have new event */
253 if (svm_fifo_set_event (s0->server_tx_fifo))
255 vec_add1 (smm->evts_partially_read[thread_index], *e0);
262 * Can't read from fifo. If we don't already have an event, save as partially
263 * read, return buff to free list and return
265 clib_warning ("dequeue fail");
267 if (svm_fifo_set_event (s0->server_tx_fifo))
269 vec_add1 (smm->evts_partially_read[thread_index], *e0);
271 vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
272 _vec_len (smm->tx_buffers[thread_index]) += 1;
278 session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
279 session_manager_main_t * smm,
280 session_fifo_event_t * e0,
281 stream_session_t * s0, u32 thread_index,
284 return session_tx_fifo_read_and_snd_i (vm, node, smm, e0, s0, thread_index,
289 session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
290 session_manager_main_t * smm,
291 session_fifo_event_t * e0,
292 stream_session_t * s0, u32 thread_index,
295 return session_tx_fifo_read_and_snd_i (vm, node, smm, e0, s0, thread_index,
300 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
301 vlib_frame_t * frame)
303 session_manager_main_t *smm = vnet_get_session_manager_main ();
304 session_fifo_event_t *my_fifo_events, *e;
305 u32 n_to_dequeue, n_events;
306 unix_shared_memory_queue_t *q;
308 int n_tx_packets = 0;
309 u32 my_thread_index = vm->cpu_index;
315 tcp_update_time (vlib_time_now (vm), my_thread_index);
318 * Get vpp queue events
320 q = smm->vpp_event_queues[my_thread_index];
321 if (PREDICT_FALSE (q == 0))
324 /* min number of events we can dequeue without blocking */
325 n_to_dequeue = q->cursize;
326 my_fifo_events = smm->fifo_events[my_thread_index];
328 if (n_to_dequeue == 0 && vec_len (my_fifo_events) == 0)
331 SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 0);
334 * If we didn't manage to process previous events try going
335 * over them again without dequeuing new ones.
337 /* XXX: Block senders to sessions that can't keep up */
338 if (vec_len (my_fifo_events) >= 100)
340 clib_warning ("too many fifo events unsolved");
344 /* See you in the next life, don't be late */
345 if (pthread_mutex_trylock (&q->mutex))
348 for (i = 0; i < n_to_dequeue; i++)
350 vec_add2 (my_fifo_events, e, 1);
351 unix_shared_memory_queue_sub_raw (q, (u8 *) e);
354 /* The other side of the connection is not polling */
355 if (q->cursize < (q->maxsize / 8))
356 (void) pthread_cond_broadcast (&q->condvar);
357 pthread_mutex_unlock (&q->mutex);
359 smm->fifo_events[my_thread_index] = my_fifo_events;
362 n_events = vec_len (my_fifo_events);
363 for (i = 0; i < n_events; i++)
365 svm_fifo_t *f0; /* $$$ prefetch 1 ahead maybe */
366 stream_session_t *s0;
368 session_fifo_event_t *e0;
370 e0 = &my_fifo_events[i];
372 session_index0 = f0->server_session_index;
374 /* $$$ add multiple event queues, per vpp worker thread */
375 ASSERT (f0->server_thread_index == my_thread_index);
377 s0 = stream_session_get_if_valid (session_index0, my_thread_index);
379 if (CLIB_DEBUG && !s0)
381 clib_warning ("It's dead, Jim!");
385 if (PREDICT_FALSE (s0->session_state == SESSION_STATE_CLOSED))
388 ASSERT (s0->thread_index == my_thread_index);
390 switch (e0->event_type)
392 case FIFO_EVENT_SERVER_TX:
393 /* Spray packets in per session type frames, since they go to
395 rv = (smm->session_tx_fns[s0->session_type]) (vm, node, smm, e0, s0,
403 case FIFO_EVENT_SERVER_EXIT:
404 stream_session_disconnect (s0);
406 case FIFO_EVENT_BUILTIN_RX:
407 svm_fifo_unset_event (s0->server_rx_fifo);
408 /* Get session's server */
409 app = application_get (s0->app_index);
410 app->cb_fns.builtin_server_rx_callback (s0);
413 clib_warning ("unhandled event type %d", e0->event_type);
419 /* Couldn't process all events. Probably out of buffers */
420 if (PREDICT_FALSE (i < n_events))
422 session_fifo_event_t *partially_read =
423 smm->evts_partially_read[my_thread_index];
424 vec_add (partially_read, &my_fifo_events[i], n_events - i);
425 vec_free (my_fifo_events);
426 smm->fifo_events[my_thread_index] = partially_read;
427 smm->evts_partially_read[my_thread_index] = 0;
431 vec_free (smm->fifo_events[my_thread_index]);
432 smm->fifo_events[my_thread_index] =
433 smm->evts_partially_read[my_thread_index];
434 smm->evts_partially_read[my_thread_index] = 0;
437 vlib_node_increment_counter (vm, session_queue_node.index,
438 SESSION_QUEUE_ERROR_TX, n_tx_packets);
440 SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 1);
446 VLIB_REGISTER_NODE (session_queue_node) =
448 .function = session_queue_node_fn,
449 .name = "session-queue",
450 .format_trace = format_session_queue_trace,
451 .type = VLIB_NODE_TYPE_INPUT,
452 .n_errors = ARRAY_LEN (session_queue_error_strings),
453 .error_strings = session_queue_error_strings,
454 .n_next_nodes = SESSION_QUEUE_N_NEXT,
455 .state = VLIB_NODE_STATE_DISABLED,
458 [SESSION_QUEUE_NEXT_DROP] = "error-drop",
459 [SESSION_QUEUE_NEXT_IP4_LOOKUP] = "ip4-lookup",
460 [SESSION_QUEUE_NEXT_IP6_LOOKUP] = "ip6-lookup",
461 [SESSION_QUEUE_NEXT_TCP_IP4_OUTPUT] = "tcp4-output",
462 [SESSION_QUEUE_NEXT_TCP_IP6_OUTPUT] = "tcp6-output",
468 * fd.io coding-style-patch-verification: ON
471 * eval: (c-set-style "gnu")