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Vector Packet Processing
drop.c
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1 /*
2  * drop.c - Punt and drop nodes
3  *
4  * Copyright (c) 2015 Cisco and/or its affiliates.
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:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
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.
16  */
17 
18 #include <vlib/vlib.h>
19 
20 typedef enum
21 {
26 
27 static u8 *
29 {
30  uword node_index = vlib_error_get_node (e[0]);
31  uword code = vlib_error_get_code (e[0]);
32  vlib_node_t *n;
33 
34  if (node_index >= vec_len (vm->node_main.nodes))
35  return format (0, "[%d], node index out of range 0x%x, error 0x%x",
36  index, node_index, e[0]);
37 
38  n = vlib_get_node (vm, node_index);
39  if (code >= n->n_errors)
40  return format (0, "[%d], code %d out of range for node %v",
41  index, code, n->name);
42 
43  return 0;
44 }
45 
46 static u8 *
49 {
50  u32 *buffers = vlib_frame_vector_args (f);
51  vlib_buffer_t *b;
52  u8 *msg = 0;
53  uword i;
54 
55  for (i = 0; i < f->n_vectors; i++)
56  {
57  b = vlib_get_buffer (vm, buffers[i]);
58  msg = validate_error (vm, &b->error, i);
59  if (msg)
60  return msg;
61  }
62 
63  return msg;
64 }
65 
68 {
69  vlib_node_t *n;
70  u32 ci, ni;
71 
72  ni = vlib_error_get_node (e);
73  n = vlib_get_node (vm, ni);
74 
75  ci = vlib_error_get_code (e);
76  ASSERT (ci < n->n_errors);
77 
78  ci += n->error_heap_index;
79 
80  return ci;
81 }
82 
83 static u8 *
84 format_error_trace (u8 * s, va_list * va)
85 {
86  vlib_main_t *vm = va_arg (*va, vlib_main_t *);
87  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
88  vlib_error_t *e = va_arg (*va, vlib_error_t *);
89  vlib_node_t *error_node;
90  vlib_error_main_t *em = &vm->error_main;
91  u32 i;
92 
93  error_node = vlib_get_node (vm, vlib_error_get_node (e[0]));
94  i = counter_index (vm, e[0]);
95  s = format (s, "%v: %s", error_node->name, em->error_strings_heap[i]);
96 
97  return s;
98 }
99 
100 static void
102  vlib_node_runtime_t * node, vlib_frame_t * frame)
103 {
104  u32 n_left, *buffers;
105 
106  buffers = vlib_frame_vector_args (frame);
107  n_left = frame->n_vectors;
108 
109  while (n_left >= 4)
110  {
111  u32 bi0, bi1;
112  vlib_buffer_t *b0, *b1;
113  vlib_error_t *t0, *t1;
114 
115  /* Prefetch next iteration. */
116  vlib_prefetch_buffer_with_index (vm, buffers[2], LOAD);
117  vlib_prefetch_buffer_with_index (vm, buffers[3], LOAD);
118 
119  bi0 = buffers[0];
120  bi1 = buffers[1];
121 
122  b0 = vlib_get_buffer (vm, bi0);
123  b1 = vlib_get_buffer (vm, bi1);
124 
125  if (b0->flags & VLIB_BUFFER_IS_TRACED)
126  {
127  t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
128  t0[0] = b0->error;
129  }
130  if (b1->flags & VLIB_BUFFER_IS_TRACED)
131  {
132  t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
133  t1[0] = b1->error;
134  }
135  buffers += 2;
136  n_left -= 2;
137  }
138 
139  while (n_left >= 1)
140  {
141  u32 bi0;
142  vlib_buffer_t *b0;
143  vlib_error_t *t0;
144 
145  bi0 = buffers[0];
146 
147  b0 = vlib_get_buffer (vm, bi0);
148 
149  if (b0->flags & VLIB_BUFFER_IS_TRACED)
150  {
151  t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
152  t0[0] = b0->error;
153  }
154  buffers += 1;
155  n_left -= 1;
156  }
157 }
158 
161  vlib_node_runtime_t * node,
162  vlib_frame_t * frame, error_disposition_t disposition)
163 {
164  u32 errors[VLIB_FRAME_SIZE], *error, *from, n_left;
165  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
166  vlib_error_main_t *em = &vm->error_main;
167 
168  from = vlib_frame_vector_args (frame);
169  n_left = frame->n_vectors;
170  b = bufs;
171  error = errors;
172 
173  vlib_get_buffers (vm, from, bufs, n_left);
174 
175  if (node->flags & VLIB_NODE_FLAG_TRACE)
176  trace_errors (vm, node, frame);
177 
178  /* collect the array of error first ... */
179  while (n_left >= 4)
180  {
181  if (n_left >= 12)
182  {
183  /* Prefetch 8 ahead - there's not much going on in each iteration */
184  vlib_prefetch_buffer_header (b[4], LOAD);
185  vlib_prefetch_buffer_header (b[5], LOAD);
186  vlib_prefetch_buffer_header (b[6], LOAD);
187  vlib_prefetch_buffer_header (b[7], LOAD);
188  }
189  error[0] = b[0]->error;
190  error[1] = b[1]->error;
191  error[2] = b[2]->error;
192  error[3] = b[3]->error;
193 
194  error += 4;
195  n_left -= 4;
196  b += 4;
197  }
198  while (n_left)
199  {
200  error[0] = b[0]->error;
201 
202  error += 1;
203  n_left -= 1;
204  b += 1;
205  }
206 
207  /* ... then count against them in blocks */
208  n_left = frame->n_vectors;
209 
210  while (n_left)
211  {
212  u16 off, count;
213  u32 c_index;
214 
215  off = frame->n_vectors - n_left;
216 
217  error = errors + off;
218 
219  count = clib_count_equal_u32 (error, n_left);
220  n_left -= count;
221 
222  c_index = counter_index (vm, error[0]);
223  em->counters[c_index] += count;
224 
225  vlib_error_elog_count (vm, c_index, count);
226  }
227 
228  if (disposition == ERROR_DISPOSITION_DROP || !vm->os_punt_frame)
229  {
230  vlib_buffer_free (vm, from, frame->n_vectors);
231 
232  /* If there is no punt function, free the frame as well. */
233  if (disposition == ERROR_DISPOSITION_PUNT && !vm->os_punt_frame)
234  vlib_frame_free (vm, node, frame);
235  }
236  else
237  vm->os_punt_frame (vm, node, frame);
238 
239  return frame->n_vectors;
240 }
241 
243  vlib_node_runtime_t * node,
244  vlib_frame_t * frame)
245 {
246  return process_drop_punt (vm, node, frame, ERROR_DISPOSITION_DROP);
247 }
248 
250  vlib_node_runtime_t * node,
251  vlib_frame_t * frame)
252 {
253  return process_drop_punt (vm, node, frame, ERROR_DISPOSITION_PUNT);
254 }
255 
256 /* *INDENT-OFF* */
258  .name = "drop",
259  .flags = VLIB_NODE_FLAG_IS_DROP,
260  .vector_size = sizeof (u32),
261  .format_trace = format_error_trace,
262  .validate_frame = validate_error_frame,
263 };
264 /* *INDENT-ON* */
265 
266 /* *INDENT-OFF* */
268  .name = "punt",
271  .vector_size = sizeof (u32),
272  .format_trace = format_error_trace,
273  .validate_frame = validate_error_frame,
274 };
275 /* *INDENT-ON* */
276 
277 /*
278  * fd.io coding-style-patch-verification: ON
279  *
280  * Local Variables:
281  * eval: (c-set-style "gnu")
282  * End:
283  */
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:124
u32 error_heap_index
Definition: node.h:323
#define CLIB_UNUSED(x)
Definition: clib.h:82
static u8 * validate_error(vlib_main_t *vm, vlib_error_t *e, u32 index)
Definition: drop.c:28
static void vlib_buffer_free(vlib_main_t *vm, u32 *buffers, u32 n_buffers)
Free buffers Frees the entire buffer chain for each buffer.
Definition: buffer_funcs.h:865
error_disposition_t
Definition: drop.c:20
#define VLIB_NODE_FLAG_IS_PUNT
Definition: node.h:297
u16 vlib_error_t
Definition: error.h:44
int i
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
vlib_node_registration_t error_drop_node
(constructor) VLIB_REGISTER_NODE (error_drop_node)
Definition: drop.c:257
#define VLIB_NODE_FN(node)
Definition: node.h:201
unsigned char u8
Definition: types.h:56
#define static_always_inline
Definition: clib.h:99
#define vlib_prefetch_buffer_with_index(vm, bi, type)
Prefetch buffer metadata by buffer index The first 64 bytes of buffer contains most header informatio...
Definition: buffer_funcs.h:440
static u8 * format_error_trace(u8 *s, va_list *va)
Definition: drop.c:84
#define always_inline
Definition: clib.h:98
vlib_node_t ** nodes
Definition: node.h:698
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:203
unsigned int u32
Definition: types.h:88
#define VLIB_FRAME_SIZE
Definition: node.h:376
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
static_always_inline uword process_drop_punt(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, error_disposition_t disposition)
Definition: drop.c:160
vlib_error_main_t error_main
Definition: main.h:158
unsigned short u16
Definition: types.h:57
void vlib_frame_free(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_frame_t *f)
Definition: main.c:218
static u32 counter_index(vlib_main_t *vm, vlib_error_t e)
Definition: drop.c:67
static u32 vlib_error_get_code(vlib_error_t e)
Definition: error.h:53
u8 * name
Definition: node.h:263
u64 * counters
Definition: error.h:78
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
char ** error_strings_heap
Definition: error.h:85
u16 n_vectors
Definition: node.h:395
vlib_main_t * vm
Definition: buffer.c:312
#define VLIB_NODE_FLAG_FRAME_NO_FREE_AFTER_DISPATCH
Definition: node.h:292
static u8 * validate_error_frame(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *f)
Definition: drop.c:47
vlib_node_registration_t error_punt_node
(constructor) VLIB_REGISTER_NODE (error_punt_node)
Definition: drop.c:267
#define ASSERT(truth)
size_t count
Definition: vapi.c:47
static void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace_funcs.h:57
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
vlib_node_main_t node_main
Definition: main.h:135
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:274
#define VLIB_NODE_FLAG_IS_DROP
Definition: node.h:296
static void vlib_error_elog_count(vlib_main_t *vm, uword counter, uword increment)
Definition: error_funcs.h:46
u16 n_errors
Definition: node.h:316
static_always_inline uword clib_count_equal_u32(u32 *data, uword max_count)
Definition: string.h:520
void(* os_punt_frame)(struct vlib_main_t *vm, struct vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: main.h:162
static vlib_node_t * vlib_get_node(vlib_main_t *vm, u32 i)
Get vlib node by index.
Definition: node_funcs.h:59
u16 flags
Copy of main node flags.
Definition: node.h:508
static_always_inline void vlib_get_buffers(vlib_main_t *vm, u32 *bi, vlib_buffer_t **b, int count)
Translate array of buffer indices into buffer pointers.
Definition: buffer_funcs.h:244
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:301
static u32 vlib_error_get_node(vlib_error_t e)
Definition: error.h:47
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:85
static void trace_errors(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: drop.c:101