FD.io VPP  v18.01.2-1-g9b554f3
Vector Packet Processing
node.c
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1 /*
2  * Copyright (c) 2015 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:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
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.
14  */
15 
16 #include <vlib/vlib.h>
17 #include <vnet/vnet.h>
18 #include <vppinfra/error.h>
19 
21 
22 #include <vppinfra/error.h>
23 #include <vppinfra/elog.h>
24 
26 
27 typedef struct
28 {
31 
32 /* packet trace format function */
33 static u8 *
34 format_li_hit_trace (u8 * s, va_list * args)
35 {
36  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
37  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
38  li_hit_trace_t *t = va_arg (*args, li_hit_trace_t *);
39 
40  s = format (s, "LI_HIT: next index %d", t->next_index);
41 
42  return s;
43 }
44 
46 
47 #define foreach_li_hit_error \
48 _(HITS, "LI packets processed") \
49 _(NO_COLLECTOR, "No collector configured") \
50 _(BUFFER_ALLOCATION_FAILURE, "Buffer allocation failure")
51 
52 typedef enum
53 {
54 #define _(sym,str) LI_HIT_ERROR_##sym,
56 #undef _
59 
60 static char *li_hit_error_strings[] = {
61 #define _(sym,string) string,
63 #undef _
64 };
65 
66 typedef enum
67 {
71 
72 static uword
74  vlib_node_runtime_t * node, vlib_frame_t * frame)
75 {
76  u32 n_left_from, *from, *to_next;
77  li_hit_next_t next_index;
78  vlib_frame_t *int_frame = 0;
79  u32 *to_int_next = 0;
80  li_main_t *lm = &li_main;
81 
82  from = vlib_frame_vector_args (frame);
83  n_left_from = frame->n_vectors;
84  next_index = node->cached_next_index;
85 
86  if (PREDICT_FALSE (vec_len (lm->collectors) == 0))
87  {
89  LI_HIT_ERROR_NO_COLLECTOR, n_left_from);
90  }
91  else
92  {
93  /* The intercept frame... */
94  int_frame = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
95  to_int_next = vlib_frame_vector_args (int_frame);
96  }
97 
98  while (n_left_from > 0)
99  {
100  u32 n_left_to_next;
101 
102  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
103 
104 #if 0
105  while (n_left_from >= 4 && n_left_to_next >= 2)
106  {
107  u32 next0 = LI_HIT_NEXT_INTERFACE_OUTPUT;
108  u32 next1 = LI_HIT_NEXT_INTERFACE_OUTPUT;
109  u32 sw_if_index0, sw_if_index1;
110  u8 tmp0[6], tmp1[6];
111  ethernet_header_t *en0, *en1;
112  u32 bi0, bi1;
113  vlib_buffer_t *b0, *b1;
114 
115  /* Prefetch next iteration. */
116  {
117  vlib_buffer_t *p2, *p3;
118 
119  p2 = vlib_get_buffer (vm, from[2]);
120  p3 = vlib_get_buffer (vm, from[3]);
121 
122  vlib_prefetch_buffer_header (p2, LOAD);
123  vlib_prefetch_buffer_header (p3, LOAD);
124 
127  }
128 
129  /* speculatively enqueue b0 and b1 to the current next frame */
130  to_next[0] = bi0 = from[0];
131  to_next[1] = bi1 = from[1];
132  from += 2;
133  to_next += 2;
134  n_left_from -= 2;
135  n_left_to_next -= 2;
136 
137  b0 = vlib_get_buffer (vm, bi0);
138  b1 = vlib_get_buffer (vm, bi1);
139 
140  /* $$$$$ Dual loop: process 2 x packets here $$$$$ */
141  ASSERT (b0->current_data == 0);
142  ASSERT (b1->current_data == 0);
143 
144  en0 = vlib_buffer_get_current (b0);
145  en1 = vlib_buffer_get_current (b1);
146 
147  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
148  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
149 
150  /* Send pkt back out the RX interface */
151  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
152  vnet_buffer (b1)->sw_if_index[VLIB_TX] = sw_if_index1;
153 
154  /* $$$$$ End of processing 2 x packets $$$$$ */
155 
156  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
157  {
158  if (b0->flags & VLIB_BUFFER_IS_TRACED)
159  {
160  li_hit_trace_t *t =
161  vlib_add_trace (vm, node, b0, sizeof (*t));
162  t->sw_if_index = sw_if_index0;
163  t->next_index = next0;
164  }
165  if (b1->flags & VLIB_BUFFER_IS_TRACED)
166  {
167  li_hit_trace_t *t =
168  vlib_add_trace (vm, node, b1, sizeof (*t));
169  t->sw_if_index = sw_if_index1;
170  t->next_index = next1;
171  }
172  }
173 
174  /* verify speculative enqueues, maybe switch current next frame */
175  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
176  to_next, n_left_to_next,
177  bi0, bi1, next0, next1);
178  }
179 #endif /* $$$ dual-loop off */
180 
181  while (n_left_from > 0 && n_left_to_next > 0)
182  {
183  u32 bi0;
184  vlib_buffer_t *b0;
185  vlib_buffer_t *c0;
186  ip4_udp_header_t *iu0;
187  ip4_header_t *ip0;
188  udp_header_t *udp0;
189  u32 next0 = LI_HIT_NEXT_ETHERNET;
190 
191  /* speculatively enqueue b0 to the current next frame */
192  bi0 = from[0];
193  to_next[0] = bi0;
194  from += 1;
195  to_next += 1;
196  n_left_from -= 1;
197  n_left_to_next -= 1;
198 
199  b0 = vlib_get_buffer (vm, bi0);
200  if (PREDICT_TRUE (to_int_next != 0))
201  {
202  /* Make an intercept copy. This can fail. */
203  c0 = vlib_buffer_copy (vm, b0);
204 
205  if (PREDICT_FALSE (c0 == 0))
206  {
208  (vm, node->node_index,
209  LI_HIT_ERROR_BUFFER_ALLOCATION_FAILURE, 1);
210  goto skip;
211  }
212 
213  vlib_buffer_advance (c0, -sizeof (*iu0));
214 
215  iu0 = vlib_buffer_get_current (c0);
216  ip0 = &iu0->ip4;
217 
218  ip0->ip_version_and_header_length = 0x45;
219  ip0->ttl = 254;
220  ip0->protocol = IP_PROTOCOL_UDP;
221 
222  ip0->src_address.as_u32 = lm->src_addrs[0].as_u32;
223  ip0->dst_address.as_u32 = lm->collectors[0].as_u32;
224  ip0->length = vlib_buffer_length_in_chain (vm, c0);
225  ip0->checksum = ip4_header_checksum (ip0);
226 
227  udp0 = &iu0->udp;
228  udp0->src_port = udp0->dst_port =
229  clib_host_to_net_u16 (lm->ports[0]);
230  udp0->checksum = 0;
231  udp0->length =
232  clib_net_to_host_u16 (vlib_buffer_length_in_chain (vm, b0));
233 
234  to_int_next[0] = vlib_get_buffer_index (vm, c0);
235  to_int_next++;
236  }
237 
238  skip:
240  && (b0->flags & VLIB_BUFFER_IS_TRACED)))
241  {
242  li_hit_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
243  t->next_index = next0;
244  }
245 
246  /* verify speculative enqueue, maybe switch current next frame */
247  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
248  to_next, n_left_to_next,
249  bi0, next0);
250  }
251 
252  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
253  }
254 
255  if (int_frame)
256  {
257  int_frame->n_vectors = frame->n_vectors;
258  vlib_put_frame_to_node (vm, ip4_lookup_node.index, int_frame);
259  }
260 
262  LI_HIT_ERROR_HITS, frame->n_vectors);
263  return frame->n_vectors;
264 }
265 
266 /* *INDENT-OFF* */
268  .function = li_hit_node_fn,
269  .name = "li-hit",
270  .vector_size = sizeof (u32),
271  .format_trace = format_li_hit_trace,
272  .type = VLIB_NODE_TYPE_INTERNAL,
273 
274  .n_errors = ARRAY_LEN(li_hit_error_strings),
275  .error_strings = li_hit_error_strings,
276 
277  .n_next_nodes = LI_HIT_N_NEXT,
278 
279  /* edit / add dispositions here */
280  .next_nodes = {
281  [LI_HIT_NEXT_ETHERNET] = "ethernet-input-not-l2",
282  },
283 };
284 /* *INDENT-ON* */
285 
287 /*
288  * fd.io coding-style-patch-verification: ON
289  *
290  * Local Variables:
291  * eval: (c-set-style "gnu")
292  * End:
293  */
#define CLIB_UNUSED(x)
Definition: clib.h:79
ip4_address_t src_address
Definition: ip4_packet.h:164
li_main_t li_main
#define PREDICT_TRUE(x)
Definition: clib.h:106
struct _vlib_node_registration vlib_node_registration_t
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
static u8 * format_li_hit_trace(u8 *s, va_list *args)
Definition: node.c:34
static uword vlib_buffer_length_in_chain(vlib_main_t *vm, vlib_buffer_t *b)
Get length in bytes of the buffer chain.
Definition: buffer_funcs.h:107
u32 next_index
Definition: node.c:29
static vlib_buffer_t * vlib_buffer_copy(vlib_main_t *vm, vlib_buffer_t *b)
Definition: buffer_funcs.h:504
vlib_node_registration_t li_hit_node
(constructor) VLIB_REGISTER_NODE (li_hit_node)
Definition: node.c:25
vlib_node_registration_t ip4_lookup_node
(constructor) VLIB_REGISTER_NODE (ip4_lookup_node)
Definition: ip4_forward.c:474
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:68
ip4_address_t dst_address
Definition: ip4_packet.h:164
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:171
vlib_frame_t * vlib_get_frame_to_node(vlib_main_t *vm, u32 to_node_index)
Definition: main.c:182
li_hit_error_t
Definition: node.c:52
#define foreach_li_hit_error
Definition: node.c:47
li_hit_next_t
Definition: node.c:66
static u32 vlib_get_buffer_index(vlib_main_t *vm, void *p)
Translate buffer pointer into buffer index.
Definition: buffer_funcs.h:74
void vlib_put_frame_to_node(vlib_main_t *vm, u32 to_node_index, vlib_frame_t *f)
Definition: main.c:191
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:195
#define PREDICT_FALSE(x)
Definition: clib.h:105
u32 node_index
Node index.
Definition: node.h:437
#define vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1)
Finish enqueueing two buffers forward in the graph.
Definition: buffer_node.h:70
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:218
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:364
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1158
The fine-grained event logger allows lightweight, thread-safe event logging at minimum cost...
static char * li_hit_error_strings[]
Definition: node.c:60
u16 n_vectors
Definition: node.h:344
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:82
vlib_main_t * vm
Definition: buffer.c:283
#define VLIB_BUFFER_IS_TRACED
Definition: buffer.h:93
#define ARRAY_LEN(x)
Definition: clib.h:59
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:454
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:456
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
static uword li_hit_node_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: node.c:73
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:208
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:259
u64 uword
Definition: types.h:112
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:55
Definition: defs.h:47
ip4_address_t * src_addrs
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
unsigned char u8
Definition: types.h:56
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:267
#define vnet_buffer(b)
Definition: buffer.h:326
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u8 data[0]
Packet data.
Definition: buffer.h:159
u16 flags
Copy of main node flags.
Definition: node.h:450
u8 ip_version_and_header_length
Definition: ip4_packet.h:132
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:67
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:75
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:57
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:239
VLIB_NODE_FUNCTION_MULTIARCH(ethernet_input_not_l2_node, ethernet_input_not_l2)
Definition: node.c:1229
Definition: defs.h:46
ip4_address_t * collectors