common/vnf_common/thread.c

   1 /*
   2 // Copyright (c) 2017 Intel Corporation
   3 //
   4 // Licensed under the Apache License, Version 2.0 (the "License");
   5 // you may not use this file except in compliance with the License.
   6 // You may obtain a copy of the License at
   7 //
   8 //      http://www.apache.org/licenses/LICENSE-2.0
   9 //
  10 // Unless required by applicable law or agreed to in writing, software
  11 // distributed under the License is distributed on an "AS IS" BASIS,
  12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 // See the License for the specific language governing permissions and
  14 // limitations under the License.
  15 */
  16
  17 #include <rte_common.h>
  18 #include <rte_cycles.h>
  19 #include <rte_pipeline.h>
  20
  21 #include "pipeline_common_be.h"
  22 #include "app.h"
  23 #include "thread.h"
  24
  25 #if APP_THREAD_HEADROOM_STATS_COLLECT
  26
  27 #define PIPELINE_RUN_REGULAR(thread, pipeline)          \
  28 do {                                                    \
  29         uint64_t t0 = rte_rdtsc_precise();              \
  30         int n_pkts = rte_pipeline_run(pipeline->p);     \
  31                                                         \
  32         if (n_pkts == 0) {                              \
  33                 uint64_t t1 = rte_rdtsc_precise();      \
  34                                                         \
  35                 thread->headroom_cycles += t1 - t0;     \
  36         }                                               \
  37 } while (0)
  38
  39
  40 #define PIPELINE_RUN_CUSTOM(thread, data)               \
  41 do {                                                    \
  42         uint64_t t0 = rte_rdtsc_precise();              \
  43         int n_pkts = data->f_run(data->be);             \
  44                                                         \
  45         if (n_pkts == 0) {                              \
  46                 uint64_t t1 = rte_rdtsc_precise();      \
  47                                                         \
  48                 thread->headroom_cycles += t1 - t0;     \
  49         }                                               \
  50 } while (0)
  51
  52 #else
  53
  54 #define PIPELINE_RUN_REGULAR(thread, pipeline)          \
  55         rte_pipeline_run(pipeline->p)
  56
  57 #define PIPELINE_RUN_CUSTOM(thread, data)               \
  58         data->f_run(data->be)
  59
  60 #endif
  61
  62 static inline void *
  63 thread_msg_recv(struct rte_ring *r)
  64 {
  65         void *msg;
  66         int status = rte_ring_sc_dequeue(r, &msg);
  67
  68         if (status != 0)
  69                 return NULL;
  70
  71         return msg;
  72 }
  73
  74 static inline void
  75 thread_msg_send(struct rte_ring *r,
  76         void *msg)
  77 {
  78         int status;
  79
  80         do {
  81                 status = rte_ring_sp_enqueue(r, msg);
  82         } while (status == -ENOBUFS);
  83 }
  84
  85 static int
  86 thread_pipeline_enable(struct app_thread_data *t,
  87                 struct thread_pipeline_enable_msg_req *req)
  88 {
  89         struct app_thread_pipeline_data *p;
  90
  91         if (req->f_run == NULL) {
  92                 if (t->n_regular >= APP_MAX_THREAD_PIPELINES)
  93                         return -1;
  94         } else {
  95                 if (t->n_custom >= APP_MAX_THREAD_PIPELINES)
  96                         return -1;
  97         }
  98
  99         p = (req->f_run == NULL) ?
 100                 &t->regular[t->n_regular] :
 101                 &t->custom[t->n_custom];
 102
 103         p->pipeline_id = req->pipeline_id;
 104         p->be = req->be;
 105         p->f_run = req->f_run;
 106         p->f_timer = req->f_timer;
 107         p->timer_period = req->timer_period;
 108         p->deadline = 0;
 109
 110         if (req->f_run == NULL)
 111                 t->n_regular++;
 112         else
 113                 t->n_custom++;
 114
 115         return 0;
 116 }
 117
 118 static int
 119 thread_pipeline_disable(struct app_thread_data *t,
 120                 struct thread_pipeline_disable_msg_req *req)
 121 {
 122         uint32_t n_regular = RTE_MIN(t->n_regular, RTE_DIM(t->regular));
 123         uint32_t n_custom = RTE_MIN(t->n_custom, RTE_DIM(t->custom));
 124         uint32_t i;
 125
 126         /* search regular pipelines of current thread */
 127         for (i = 0; i < n_regular; i++) {
 128                 if (t->regular[i].pipeline_id != req->pipeline_id)
 129                         continue;
 130
 131                 if (i < n_regular - 1)
 132                         memcpy(&t->regular[i],
 133                                 &t->regular[i+1],
 134                                 (n_regular - 1 - i) * sizeof(struct app_thread_pipeline_data));
 135
 136                 n_regular--;
 137                 t->n_regular = n_regular;
 138
 139                 return 0;
 140         }
 141
 142         /* search custom pipelines of current thread */
 143         for (i = 0; i < n_custom; i++) {
 144                 if (t->custom[i].pipeline_id != req->pipeline_id)
 145                         continue;
 146
 147                 if (i < n_custom - 1)
 148                         memcpy(&t->custom[i],
 149                                 &t->custom[i+1],
 150                                 (n_custom - 1 - i) * sizeof(struct app_thread_pipeline_data));
 151
 152                 n_custom--;
 153                 t->n_custom = n_custom;
 154
 155                 return 0;
 156         }
 157
 158         /* return if pipeline not found */
 159         return -1;
 160 }
 161
 162 static int
 163 thread_msg_req_handle(struct app_thread_data *t)
 164 {
 165         void *msg_ptr;
 166         struct thread_msg_req *req;
 167         struct thread_msg_rsp *rsp;
 168
 169         msg_ptr = thread_msg_recv(t->msgq_in);
 170         req = msg_ptr;
 171         rsp = msg_ptr;
 172
 173         if (req != NULL)
 174                 switch (req->type) {
 175                 case THREAD_MSG_REQ_PIPELINE_ENABLE: {
 176                         rsp->status = thread_pipeline_enable(t,
 177                                         (struct thread_pipeline_enable_msg_req *) req);
 178                         thread_msg_send(t->msgq_out, rsp);
 179                         break;
 180                 }
 181
 182                 case THREAD_MSG_REQ_PIPELINE_DISABLE: {
 183                         rsp->status = thread_pipeline_disable(t,
 184                                         (struct thread_pipeline_disable_msg_req *) req);
 185                         thread_msg_send(t->msgq_out, rsp);
 186                         break;
 187                 }
 188
 189                 case THREAD_MSG_REQ_HEADROOM_READ: {
 190                         struct thread_headroom_read_msg_rsp *rsp =
 191                                 (struct thread_headroom_read_msg_rsp *)
 192                                 req;
 193
 194                         rsp->headroom_ratio = t->headroom_ratio;
 195                         rsp->status = 0;
 196                         thread_msg_send(t->msgq_out, rsp);
 197                         break;
 198                 }
 199                 default:
 200                         break;
 201                 }
 202
 203         return 0;
 204 }
 205
 206 static void
 207 thread_headroom_update(struct app_thread_data *t, uint64_t time)
 208 {
 209         uint64_t time_diff = time - t->headroom_time;
 210
 211         t->headroom_ratio =
 212                 ((double) t->headroom_cycles) / ((double) time_diff);
 213
 214         t->headroom_cycles = 0;
 215         t->headroom_time = rte_rdtsc_precise();
 216 }
 217
 218 int
 219 app_thread(void *arg)
 220 {
 221         struct app_params *app = (struct app_params *) arg;
 222         uint32_t core_id = rte_lcore_id(), i, j;
 223         struct app_thread_data *t = &app->thread_data[core_id];
 224
 225         for (i = 0; ; i++) {
 226                 uint32_t n_regular = RTE_MIN(t->n_regular, RTE_DIM(t->regular));
 227                 uint32_t n_custom = RTE_MIN(t->n_custom, RTE_DIM(t->custom));
 228
 229                 /* Run regular pipelines */
 230                 for (j = 0; j < n_regular; j++) {
 231                         struct app_thread_pipeline_data *data = &t->regular[j];
 232                         struct pipeline *p = data->be;
 233
 234                         PIPELINE_RUN_REGULAR(t, p);
 235                 }
 236
 237                 /* Run custom pipelines */
 238                 for (j = 0; j < n_custom; j++) {
 239                         struct app_thread_pipeline_data *data = &t->custom[j];
 240
 241                         PIPELINE_RUN_CUSTOM(t, data);
 242                 }
 243
 244                 /* Timer */
 245                 if ((i & 0xF) == 0) {
 246                         uint64_t time = rte_get_tsc_cycles();
 247                         uint64_t t_deadline = UINT64_MAX;
 248
 249                         if (time < t->deadline)
 250                                 continue;
 251
 252                         /* Timer for regular pipelines */
 253                         for (j = 0; j < n_regular; j++) {
 254                                 struct app_thread_pipeline_data *data =
 255                                         &t->regular[j];
 256                                 uint64_t p_deadline = data->deadline;
 257
 258                                 if (p_deadline <= time) {
 259                                         data->f_timer(data->be);
 260                                         p_deadline = time + data->timer_period;
 261                                         data->deadline = p_deadline;
 262                                 }
 263
 264                                 if (p_deadline < t_deadline)
 265                                         t_deadline = p_deadline;
 266                         }
 267
 268                         /* Timer for custom pipelines */
 269                         for (j = 0; j < n_custom; j++) {
 270                                 struct app_thread_pipeline_data *data =
 271                                         &t->custom[j];
 272                                 uint64_t p_deadline = data->deadline;
 273
 274                                 if (p_deadline <= time) {
 275                                         data->f_timer(data->be);
 276                                         p_deadline = time + data->timer_period;
 277                                         data->deadline = p_deadline;
 278                                 }
 279
 280                                 if (p_deadline < t_deadline)
 281                                         t_deadline = p_deadline;
 282                         }
 283
 284                         /* Timer for thread message request */
 285                         {
 286                                 uint64_t deadline = t->thread_req_deadline;
 287
 288                                 if (deadline <= time) {
 289                                         thread_msg_req_handle(t);
 290                                         thread_headroom_update(t, time);
 291                                         deadline = time + t->timer_period;
 292                                         t->thread_req_deadline = deadline;
 293                                 }
 294
 295                                 if (deadline < t_deadline)
 296                                         t_deadline = deadline;
 297                         }
 298
 299
 300                         t->deadline = t_deadline;
 301                 }
 302         }
 303
 304         return 0;
 305 }