FD.io VPP  v17.01-9-ge7dcee4
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 {
30 
31 /* packet trace format function */
32 static u8 * format_li_hit_trace (u8 * s, va_list * args)
33 {
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  li_hit_trace_t * t = va_arg (*args, li_hit_trace_t *);
37 
38  s = format (s, "LI_HIT: next index %d", t->next_index);
39 
40  return s;
41 }
42 
44 
45 #define foreach_li_hit_error \
46 _(HITS, "LI packets processed") \
47 _(NO_COLLECTOR, "No collector configured")
48 
49 typedef enum {
50 #define _(sym,str) LI_HIT_ERROR_##sym,
52 #undef _
55 
56 static char * li_hit_error_strings[] = {
57 #define _(sym,string) string,
59 #undef _
60 };
61 
62 typedef enum {
66 
67 static uword
69  vlib_node_runtime_t * node,
70  vlib_frame_t * frame)
71 {
72  u32 n_left_from, * from, * to_next;
73  li_hit_next_t next_index;
74  vlib_frame_t * int_frame = 0;
75  u32 * to_int_next = 0;
76  li_main_t * lm = &li_main;
77 
78  from = vlib_frame_vector_args (frame);
79  n_left_from = frame->n_vectors;
80  next_index = node->cached_next_index;
81 
82  if (PREDICT_FALSE (vec_len (lm->collectors) == 0))
83  {
85  LI_HIT_ERROR_NO_COLLECTOR,
86  n_left_from);
87  }
88  else
89  {
90  /* The intercept frame... */
91  int_frame = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
92  to_int_next = vlib_frame_vector_args (int_frame);
93  }
94 
95  while (n_left_from > 0)
96  {
97  u32 n_left_to_next;
98 
99  vlib_get_next_frame (vm, node, next_index,
100  to_next, n_left_to_next);
101 
102 #if 0
103  while (n_left_from >= 4 && n_left_to_next >= 2)
104  {
105  u32 next0 = LI_HIT_NEXT_INTERFACE_OUTPUT;
106  u32 next1 = LI_HIT_NEXT_INTERFACE_OUTPUT;
107  u32 sw_if_index0, sw_if_index1;
108  u8 tmp0[6], tmp1[6];
109  ethernet_header_t *en0, *en1;
110  u32 bi0, bi1;
111  vlib_buffer_t * b0, * b1;
112 
113  /* Prefetch next iteration. */
114  {
115  vlib_buffer_t * p2, * p3;
116 
117  p2 = vlib_get_buffer (vm, from[2]);
118  p3 = vlib_get_buffer (vm, from[3]);
119 
120  vlib_prefetch_buffer_header (p2, LOAD);
121  vlib_prefetch_buffer_header (p3, LOAD);
122 
125  }
126 
127  /* speculatively enqueue b0 and b1 to the current next frame */
128  to_next[0] = bi0 = from[0];
129  to_next[1] = bi1 = from[1];
130  from += 2;
131  to_next += 2;
132  n_left_from -= 2;
133  n_left_to_next -= 2;
134 
135  b0 = vlib_get_buffer (vm, bi0);
136  b1 = vlib_get_buffer (vm, bi1);
137 
138  /* $$$$$ Dual loop: process 2 x packets here $$$$$ */
139  ASSERT (b0->current_data == 0);
140  ASSERT (b1->current_data == 0);
141 
142  en0 = vlib_buffer_get_current (b0);
143  en1 = vlib_buffer_get_current (b1);
144 
145  sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
146  sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
147 
148  /* Send pkt back out the RX interface */
149  vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
150  vnet_buffer(b1)->sw_if_index[VLIB_TX] = sw_if_index1;
151 
152  /* $$$$$ End of processing 2 x packets $$$$$ */
153 
155  {
156  if (b0->flags & VLIB_BUFFER_IS_TRACED)
157  {
158  li_hit_trace_t *t =
159  vlib_add_trace (vm, node, b0, sizeof (*t));
160  t->sw_if_index = sw_if_index0;
161  t->next_index = next0;
162  }
163  if (b1->flags & VLIB_BUFFER_IS_TRACED)
164  {
165  li_hit_trace_t *t =
166  vlib_add_trace (vm, node, b1, sizeof (*t));
167  t->sw_if_index = sw_if_index1;
168  t->next_index = next1;
169  }
170  }
171 
172  /* verify speculative enqueues, maybe switch current next frame */
173  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
174  to_next, n_left_to_next,
175  bi0, bi1, next0, next1);
176  }
177 #endif /* $$$ dual-loop off */
178 
179  while (n_left_from > 0 && n_left_to_next > 0)
180  {
181  u32 bi0;
182  vlib_buffer_t * b0;
183  vlib_buffer_t * c0;
184  ip4_udp_header_t * iu0;
185  ip4_header_t * ip0;
186  udp_header_t * udp0;
187  u32 next0 = LI_HIT_NEXT_ETHERNET;
188 
189  /* speculatively enqueue b0 to the current next frame */
190  bi0 = from[0];
191  to_next[0] = bi0;
192  from += 1;
193  to_next += 1;
194  n_left_from -= 1;
195  n_left_to_next -= 1;
196 
197  b0 = vlib_get_buffer (vm, bi0);
198  if (PREDICT_TRUE(to_int_next != 0))
199  {
200  /* Make an intercept copy */
201  c0 = vlib_buffer_copy (vm, b0);
202 
203  vlib_buffer_advance(c0, -sizeof(*iu0));
204 
205  iu0 = vlib_buffer_get_current(c0);
206  ip0 = &iu0->ip4;
207 
208  ip0->ip_version_and_header_length = 0x45;
209  ip0->ttl = 254;
210  ip0->protocol = IP_PROTOCOL_UDP;
211 
212  ip0->src_address.as_u32 = lm->src_addrs[0].as_u32;
213  ip0->dst_address.as_u32 = lm->collectors[0].as_u32;
214  ip0->length = vlib_buffer_length_in_chain (vm, c0);
215  ip0->checksum = ip4_header_checksum (ip0);
216 
217  udp0 = &iu0->udp;
218  udp0->src_port = udp0->dst_port =
219  clib_host_to_net_u16(lm->ports[0]);
220  udp0->checksum = 0;
221  udp0->length =
222  clib_net_to_host_u16 (vlib_buffer_length_in_chain (vm , b0));
223 
224  to_int_next [0] = vlib_get_buffer_index (vm, c0);
225  to_int_next++;
226  }
227 
229  && (b0->flags & VLIB_BUFFER_IS_TRACED)))
230  {
231  li_hit_trace_t *t =
232  vlib_add_trace (vm, node, b0, sizeof (*t));
233  t->next_index = next0;
234  }
235 
236  /* verify speculative enqueue, maybe switch current next frame */
237  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
238  to_next, n_left_to_next,
239  bi0, next0);
240  }
241 
242  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
243  }
244 
245  if (int_frame)
246  {
247  int_frame->n_vectors = frame->n_vectors;
248  vlib_put_frame_to_node (vm, ip4_lookup_node.index, int_frame);
249  }
250 
252  LI_HIT_ERROR_HITS, frame->n_vectors);
253  return frame->n_vectors;
254 }
255 
257  .function = li_hit_node_fn,
258  .name = "li-hit",
259  .vector_size = sizeof (u32),
260  .format_trace = format_li_hit_trace,
262 
263  .n_errors = ARRAY_LEN(li_hit_error_strings),
264  .error_strings = li_hit_error_strings,
265 
266  .n_next_nodes = LI_HIT_N_NEXT,
267 
268  /* edit / add dispositions here */
269  .next_nodes = {
270  [LI_HIT_NEXT_ETHERNET] = "ethernet-input-not-l2",
271  },
272 };
273 
275 
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:459
li_hit_error_t
Definition: node.c:49
#define CLIB_UNUSED(x)
Definition: clib.h:79
ip4_address_t src_address
Definition: ip4_packet.h:163
bad routing header type(not 4)") sr_error (NO_MORE_SEGMENTS
#define PREDICT_TRUE(x)
Definition: clib.h:98
struct _vlib_node_registration vlib_node_registration_t
vlib_node_registration_t li_hit_node
(constructor) VLIB_REGISTER_NODE (li_hit_node)
Definition: node.c:25
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:100
li_hit_next_t
Definition: node.c:62
u32 next_index
Definition: node.c:28
static vlib_buffer_t * vlib_buffer_copy(vlib_main_t *vm, vlib_buffer_t *b)
Definition: buffer_funcs.h:407
vlib_node_registration_t ip4_lookup_node
(constructor) VLIB_REGISTER_NODE (ip4_lookup_node)
Definition: ip4_forward.c:511
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:78
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:194
ip4_address_t dst_address
Definition: ip4_packet.h:163
#define foreach_li_hit_error
Definition: node.c:45
static char * li_hit_error_strings[]
Definition: node.c:56
static u32 vlib_get_buffer_index(vlib_main_t *vm, void *p)
Translate buffer pointer into buffer index.
Definition: buffer_funcs.h:70
#define PREDICT_FALSE(x)
Definition: clib.h:97
void vlib_put_frame_to_node(vlib_main_t *vm, u32 to_node_index, vlib_frame_t *f)
Definition: main.c:196
#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:216
#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:350
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1113
u16 n_vectors
Definition: node.h:344
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:82
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:207
#define ARRAY_LEN(x)
Definition: clib.h:59
u16 cached_next_index
Definition: node.h:463
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
#define vnet_buffer(b)
Definition: buffer.h:361
VLIB_NODE_FUNCTION_MULTIARCH(dpdk_input_node, dpdk_input)
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:259
#define VLIB_BUFFER_IS_TRACED
Definition: buffer.h:95
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:253
li_main_t li_main
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:170
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:418
static uword li_hit_node_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: node.c:68
u8 data[0]
Packet data.
Definition: buffer.h:158
u8 ip_version_and_header_length
Definition: ip4_packet.h:131
vlib_frame_t * vlib_get_frame_to_node(vlib_main_t *vm, u32 to_node_index)
Definition: main.c:187
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:67
u32 flags
buffer flags: VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:85
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:238
static u8 * format_li_hit_trace(u8 *s, va_list *args)
Definition: node.c:32
Definition: defs.h:46
ip4_address_t * collectors