1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*
* node.c - skeleton vpp engine plug-in dual-loop node skeleton
*
* Copyright (c) <current-year> <your-organization>
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/pg/pg.h>
#include <vppinfra/error.h>
#include <nsim/nsim.h>
typedef struct
{
f64 expires;
u32 tx_sw_if_index;
int is_drop;
} nsim_trace_t;
#ifndef CLIB_MARCH_VARIANT
/* packet trace format function */
static u8 *
format_nsim_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
nsim_trace_t *t = va_arg (*args, nsim_trace_t *);
if (t->is_drop)
s = format (s, "NSIM: ring drop");
else
s = format (s, "NSIM: tx time %.6f sw_if_index %d",
t->expires, t->tx_sw_if_index);
return s;
}
vlib_node_registration_t nsim_node;
#endif /* CLIB_MARCH_VARIANT */
#define foreach_nsim_error \
_(BUFFERED, "Packets buffered") \
_(DROPPED, "Packets dropped due to lack of space")
typedef enum
{
#define _(sym,str) NSIM_ERROR_##sym,
foreach_nsim_error
#undef _
NSIM_N_ERROR,
} nsim_error_t;
#ifndef CLIB_MARCH_VARIANT
static char *nsim_error_strings[] = {
#define _(sym,string) string,
foreach_nsim_error
#undef _
};
#endif /* CLIB_MARCH_VARIANT */
typedef enum
{
NSIM_NEXT_DROP,
NSIM_N_NEXT,
} nsim_next_t;
always_inline uword
nsim_inline (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame, int is_trace)
{
nsim_main_t *nsm = &nsim_main;
u32 n_left_from, *from;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
u16 nexts[VLIB_FRAME_SIZE], *next;
u32 my_thread_index = vm->thread_index;
nsim_wheel_t *wp = nsm->wheel_by_thread[my_thread_index];
f64 now = vlib_time_now (vm);
f64 expires = now + nsm->delay;
int is_drop0;
u32 no_error = node->errors[NSIM_ERROR_BUFFERED];
u32 no_buffer_error = node->errors[NSIM_ERROR_DROPPED];
nsim_wheel_entry_t *ep = 0;
ASSERT (wp);
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
vlib_get_buffers (vm, from, bufs, n_left_from);
b = bufs;
next = nexts;
/* There is no point in trying to do more than 1 pkt here */
while (n_left_from > 0)
{
b[0]->error = no_error;
next[0] = NSIM_NEXT_DROP;
is_drop0 = 0;
if (PREDICT_TRUE (wp->cursize < wp->wheel_size))
{
ep = wp->entries + wp->tail;
wp->tail++;
if (wp->tail == wp->wheel_size)
wp->tail = 0;
wp->cursize++;
ep->tx_time = expires;
ep->tx_sw_if_index =
(vnet_buffer (b[0])->sw_if_index[VLIB_RX] == nsm->sw_if_index0)
? nsm->sw_if_index1 : nsm->sw_if_index0;
ep->current_length = vlib_buffer_length_in_chain (vm, b[0]);
ASSERT (ep->current_length <= WHEEL_ENTRY_DATA_SIZE);
clib_memcpy_fast (ep->data, vlib_buffer_get_current (b[0]),
ep->current_length);
}
else /* out of wheel space, drop pkt */
{
b[0]->error = no_buffer_error;
is_drop0 = 1;
}
if (is_trace)
{
if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
{
nsim_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t));
t->expires = expires;
t->is_drop = is_drop0;
t->tx_sw_if_index = (is_drop0 == 0) ? ep->tx_sw_if_index : 0;
}
}
b += 1;
next += 1;
n_left_from -= 1;
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
return frame->n_vectors;
}
VLIB_NODE_FN (nsim_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
return nsim_inline (vm, node, frame, 1 /* is_trace */ );
else
return nsim_inline (vm, node, frame, 0 /* is_trace */ );
}
/* *INDENT-OFF* */
#ifndef CLIB_MARCH_VARIANT
VLIB_REGISTER_NODE (nsim_node) =
{
.name = "nsim",
.vector_size = sizeof (u32),
.format_trace = format_nsim_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(nsim_error_strings),
.error_strings = nsim_error_strings,
.n_next_nodes = NSIM_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[NSIM_NEXT_DROP] = "error-drop",
},
};
#endif /* CLIB_MARCH_VARIANT */
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
