2 * nsim.c - skeleton vpp engine plug-in
4 * Copyright (c) <current-year> <your-organization>
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #include <vlib/vlib.h>
19 #include <vnet/vnet.h>
20 #include <vppinfra/error.h>
21 #include <nsim/nsim.h>
29 #ifndef CLIB_MARCH_VARIANT
30 /* packet trace format function */
32 format_nsim_tx_trace (u8 * s, va_list * args)
34 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
35 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
36 nsim_tx_trace_t *t = va_arg (*args, nsim_tx_trace_t *);
38 s = format (s, "NSIM: tx at %.6f next_index %d", t->expired, t->next_index);
41 #endif /* CLIB_MARCH_VARIANT */
43 #define foreach_nsim_tx_error \
44 _(TRANSMITTED, "Packets transmitted")
48 #define _(sym,str) NSIM_TX_ERROR_##sym,
54 #ifndef CLIB_MARCH_VARIANT
55 static char *nsim_tx_error_strings[] = {
56 #define _(sym,string) string,
60 #endif /* CLIB_MARCH_VARIANT */
69 nsim_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
70 vlib_frame_t * f, int is_trace)
72 nsim_main_t *nsm = &nsim_main;
73 nsim_wheel_t *wp = nsm->wheel_by_thread[vm->thread_index];
74 nsim_wheel_entry_t *ep;
77 /* Nothing on the scheduler wheel? */
81 /* First entry on the wheel isn't expired? */
82 ep = wp->entries + wp->head;
83 now = vlib_time_now (vm);
84 if (ep->tx_time > now)
87 u32 n_burst = clib_min (wp->cursize, NSIM_MAX_TX_BURST), n_tx_packets = 0;
88 u32 froms[NSIM_MAX_TX_BURST], *from;
89 u16 nexts[NSIM_MAX_TX_BURST], *next;
93 while (n_tx_packets < n_burst && ep->tx_time <= now)
95 /* prefetch one line / 2 entries ahead */
96 if ((((uword) ep) & (CLIB_CACHE_LINE_BYTES - 1)) == 0)
97 CLIB_PREFETCH ((ep + 2), CLIB_CACHE_LINE_BYTES, LOAD);
99 ep = wp->entries + wp->head;
100 from[0] = ep->buffer_index;
101 next[0] = ep->output_next_index;
104 if (wp->head == wp->wheel_size)
112 wp->cursize -= n_tx_packets;
113 vlib_buffer_enqueue_to_next (vm, node, froms, nexts, n_tx_packets);
114 vlib_node_increment_counter (vm, node->node_index,
115 NSIM_TX_ERROR_TRANSMITTED, n_tx_packets);
119 VLIB_NODE_FN (nsim_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
120 vlib_frame_t * frame)
122 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
123 return nsim_input_inline (vm, node, frame, 1 /* is_trace */ );
125 return nsim_input_inline (vm, node, frame, 0 /* is_trace */ );
130 #ifndef CLIB_MARCH_VARIANT
131 VLIB_REGISTER_NODE (nsim_input_node) =
133 .type = VLIB_NODE_TYPE_INPUT,
134 .name = "nsim-wheel",
136 /* Will be enabled if/when the feature is configured */
137 .state = VLIB_NODE_STATE_DISABLED,
139 .format_trace = format_nsim_tx_trace,
141 .n_errors = NSIM_TX_N_ERROR,
142 .error_strings = nsim_tx_error_strings,
144 #endif /* CLIB_MARCH_VARIANT */
148 * fd.io coding-style-patch-verification: ON
151 * eval: (c-set-style "gnu")