FD.io VPP  v18.07-34-g55fbdb9
Vector Packet Processing
flow_classify_node.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2016 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 <stdint.h>
17 
18 #include <vlib/vlib.h>
19 #include <vnet/vnet.h>
20 #include <vnet/ip/ip.h>
23 
24 typedef struct
25 {
31 
32 static u8 *
33 format_flow_classify_trace (u8 * s, va_list * args)
34 {
35  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
36  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
37  flow_classify_trace_t *t = va_arg (*args, flow_classify_trace_t *);
38 
39  s = format (s, "FLOW_CLASSIFY: sw_if_index %d next %d table %d offset %d",
40  t->sw_if_index, t->next_index, t->table_index, t->offset);
41  return s;
42 }
43 
44 #define foreach_flow_classify_error \
45 _(MISS, "Flow classify misses") \
46 _(HIT, "Flow classify hits") \
47 _(CHAIN_HIT, "Flow classify hits after chain walk") \
48 _(DROP, "Flow classify action drop")
49 
50 typedef enum
51 {
52 #define _(sym,str) FLOW_CLASSIFY_ERROR_##sym,
54 #undef _
57 
58 static char *flow_classify_error_strings[] = {
59 #define _(sym,string) string,
61 #undef _
62 };
63 
64 static inline uword
66  vlib_node_runtime_t * node,
68 {
69  u32 n_left_from, *from, *to_next;
70  flow_classify_next_index_t next_index;
73  f64 now = vlib_time_now (vm);
74  u32 hits = 0;
75  u32 misses = 0;
76  u32 chain_hits = 0;
77  u32 drop = 0;
78 
79  from = vlib_frame_vector_args (frame);
80  n_left_from = frame->n_vectors;
81 
82  /* First pass: compute hashes */
83  while (n_left_from > 2)
84  {
85  vlib_buffer_t *b0, *b1;
86  u32 bi0, bi1;
87  u8 *h0, *h1;
88  u32 sw_if_index0, sw_if_index1;
89  u32 table_index0, table_index1;
90  vnet_classify_table_t *t0, *t1;
91 
92  /* Prefetch next iteration */
93  {
94  vlib_buffer_t *p1, *p2;
95 
96  p1 = vlib_get_buffer (vm, from[1]);
97  p2 = vlib_get_buffer (vm, from[2]);
98 
99  vlib_prefetch_buffer_header (p1, STORE);
101  vlib_prefetch_buffer_header (p2, STORE);
103  }
104 
105  bi0 = from[0];
106  b0 = vlib_get_buffer (vm, bi0);
107  h0 = b0->data;
108 
109  bi1 = from[1];
110  b1 = vlib_get_buffer (vm, bi1);
111  h1 = b1->data;
112 
113  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
114  table_index0 =
115  fcm->classify_table_index_by_sw_if_index[tid][sw_if_index0];
116 
117  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
118  table_index1 =
119  fcm->classify_table_index_by_sw_if_index[tid][sw_if_index1];
120 
121  t0 = pool_elt_at_index (vcm->tables, table_index0);
122 
123  t1 = pool_elt_at_index (vcm->tables, table_index1);
124 
125  vnet_buffer (b0)->l2_classify.hash =
126  vnet_classify_hash_packet (t0, (u8 *) h0);
127 
128  vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);
129 
130  vnet_buffer (b1)->l2_classify.hash =
131  vnet_classify_hash_packet (t1, (u8 *) h1);
132 
133  vnet_classify_prefetch_bucket (t1, vnet_buffer (b1)->l2_classify.hash);
134 
135  vnet_buffer (b0)->l2_classify.table_index = table_index0;
136 
137  vnet_buffer (b1)->l2_classify.table_index = table_index1;
138 
139  from += 2;
140  n_left_from -= 2;
141  }
142 
143  while (n_left_from > 0)
144  {
145  vlib_buffer_t *b0;
146  u32 bi0;
147  u8 *h0;
148  u32 sw_if_index0;
149  u32 table_index0;
151 
152  bi0 = from[0];
153  b0 = vlib_get_buffer (vm, bi0);
154  h0 = b0->data;
155 
156  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
157  table_index0 =
158  fcm->classify_table_index_by_sw_if_index[tid][sw_if_index0];
159 
160  t0 = pool_elt_at_index (vcm->tables, table_index0);
161  vnet_buffer (b0)->l2_classify.hash =
162  vnet_classify_hash_packet (t0, (u8 *) h0);
163 
164  vnet_buffer (b0)->l2_classify.table_index = table_index0;
165  vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);
166 
167  from++;
168  n_left_from--;
169  }
170 
171  next_index = node->cached_next_index;
172  from = vlib_frame_vector_args (frame);
173  n_left_from = frame->n_vectors;
174 
175  while (n_left_from > 0)
176  {
177  u32 n_left_to_next;
178 
179  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
180 
181  /* Not enough load/store slots to dual loop... */
182  while (n_left_from > 0 && n_left_to_next > 0)
183  {
184  u32 bi0;
185  vlib_buffer_t *b0;
187  u32 table_index0;
189  vnet_classify_entry_t *e0;
190  u64 hash0;
191  u8 *h0;
192 
193  /* Stride 3 seems to work best */
194  if (PREDICT_TRUE (n_left_from > 3))
195  {
196  vlib_buffer_t *p1 = vlib_get_buffer (vm, from[3]);
198  u32 table_index1;
199  u64 phash1;
200 
201  table_index1 = vnet_buffer (p1)->l2_classify.table_index;
202 
203  if (PREDICT_TRUE (table_index1 != ~0))
204  {
205  tp1 = pool_elt_at_index (vcm->tables, table_index1);
206  phash1 = vnet_buffer (p1)->l2_classify.hash;
207  vnet_classify_prefetch_entry (tp1, phash1);
208  }
209  }
210 
211  /* Speculatively enqueue b0 to the current next frame */
212  bi0 = from[0];
213  to_next[0] = bi0;
214  from += 1;
215  to_next += 1;
216  n_left_from -= 1;
217  n_left_to_next -= 1;
218 
219  b0 = vlib_get_buffer (vm, bi0);
220  h0 = b0->data;
221  table_index0 = vnet_buffer (b0)->l2_classify.table_index;
222  e0 = 0;
223  t0 = 0;
224 
226  &b0->current_config_index, &next0,
227  /* # bytes of config data */ 0);
228 
229  if (PREDICT_TRUE (table_index0 != ~0))
230  {
231  hash0 = vnet_buffer (b0)->l2_classify.hash;
232  t0 = pool_elt_at_index (vcm->tables, table_index0);
233  e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
234  if (e0)
235  {
236  hits++;
237  }
238  else
239  {
240  misses++;
241  vnet_classify_add_del_session (vcm, table_index0,
242  h0, ~0, 0, 0, 0, 0, 1);
243  /* increment counter */
244  vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
245  }
246  }
248  && (b0->flags & VLIB_BUFFER_IS_TRACED)))
249  {
251  vlib_add_trace (vm, node, b0, sizeof (*t));
252  t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
253  t->next_index = next0;
254  t->table_index = t0 ? t0 - vcm->tables : ~0;
255  t->offset = (t0 && e0) ? vnet_classify_get_offset (t0, e0) : ~0;
256  }
257 
258  /* Verify speculative enqueue, maybe switch current next frame */
259  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
260  n_left_to_next, bi0, next0);
261  }
262 
263  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
264  }
265 
267  FLOW_CLASSIFY_ERROR_MISS, misses);
269  FLOW_CLASSIFY_ERROR_HIT, hits);
271  FLOW_CLASSIFY_ERROR_CHAIN_HIT, chain_hits);
273  FLOW_CLASSIFY_ERROR_DROP, drop);
274 
275  return frame->n_vectors;
276 }
277 
278 static uword
280  vlib_node_runtime_t * node, vlib_frame_t * frame)
281 {
282  return flow_classify_inline (vm, node, frame, FLOW_CLASSIFY_TABLE_IP4);
283 }
284 
285 /* *INDENT-OFF* */
287  .function = ip4_flow_classify,
288  .name = "ip4-flow-classify",
289  .vector_size = sizeof (u32),
290  .format_trace = format_flow_classify_trace,
292  .error_strings = flow_classify_error_strings,
293  .n_next_nodes = FLOW_CLASSIFY_NEXT_INDEX_N_NEXT,
294  .next_nodes = {
295  [FLOW_CLASSIFY_NEXT_INDEX_DROP] = "error-drop",
296  },
297 };
298 /* *INDENT-ON* */
299 
301 
302 static uword
304  vlib_node_runtime_t * node, vlib_frame_t * frame)
305 {
306  return flow_classify_inline (vm, node, frame, FLOW_CLASSIFY_TABLE_IP6);
307 }
308 
309 /* *INDENT-OFF* */
311  .function = ip6_flow_classify,
312  .name = "ip6-flow-classify",
313  .vector_size = sizeof (u32),
314  .format_trace = format_flow_classify_trace,
316  .error_strings = flow_classify_error_strings,
317  .n_next_nodes = FLOW_CLASSIFY_NEXT_INDEX_N_NEXT,
318  .next_nodes = {
319  [FLOW_CLASSIFY_NEXT_INDEX_DROP] = "error-drop",
320  },
321 };
322 
323 /* *INDENT-ON* */
324 
326 
327 
328 static clib_error_t *
330 {
332 
333  fcm->vlib_main = vm;
334  fcm->vnet_main = vnet_get_main ();
336 
337  return 0;
338 }
339 
341 
342 /*
343  * fd.io coding-style-patch-verification: ON
344  *
345  * Local Variables:
346  * eval: (c-set-style "gnu")
347  * End:
348  */
u64 vnet_classify_hash_packet(vnet_classify_table_t *t, u8 *h)
vnet_config_main_t * vnet_config_main[FLOW_CLASSIFY_N_TABLES]
Definition: flow_classify.h:45
#define CLIB_UNUSED(x)
Definition: clib.h:79
static char * flow_classify_error_strings[]
u32 current_config_index
Used by feature subgraph arcs to visit enabled feature nodes.
Definition: buffer.h:132
VLIB_NODE_FUNCTION_MULTIARCH(ip4_flow_classify_node, ip4_flow_classify)
vnet_main_t * vnet_get_main(void)
Definition: misc.c:47
#define PREDICT_TRUE(x)
Definition: clib.h:106
unsigned long u64
Definition: types.h:89
static f64 vlib_time_now(vlib_main_t *vm)
Definition: main.h:225
flow_classify_next_index_t
Definition: flow_classify.h:30
flow_classify_table_id_t
Definition: flow_classify.h:23
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
unsigned char u8
Definition: types.h:56
double f64
Definition: types.h:142
vlib_node_registration_t ip6_flow_classify_node
(constructor) VLIB_REGISTER_NODE (ip6_flow_classify_node)
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:156
static clib_error_t * flow_classify_init(vlib_main_t *vm)
u32 * classify_table_index_by_sw_if_index[FLOW_CLASSIFY_N_TABLES]
Definition: flow_classify.h:39
vlib_main_t * vlib_main
Definition: flow_classify.h:42
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:184
unsigned int u32
Definition: types.h:88
static void vnet_classify_prefetch_bucket(vnet_classify_table_t *t, u64 hash)
#define foreach_flow_classify_error
static uword ip6_flow_classify(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
static void vnet_classify_prefetch_entry(vnet_classify_table_t *t, u64 hash)
int vnet_classify_add_del_session(vnet_classify_main_t *cm, u32 table_index, u8 *match, u32 hit_next_index, u32 opaque_index, i32 advance, u8 action, u32 metadata, int is_add)
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:464
static u8 * format_flow_classify_trace(u8 *s, va_list *args)
vnet_main_t * vnet_main
Definition: flow_classify.h:43
static void * vnet_get_config_data(vnet_config_main_t *cm, u32 *config_index, u32 *next_index, u32 n_data_bytes)
Definition: config.h:122
#define PREDICT_FALSE(x)
Definition: clib.h:105
u32 node_index
Node index.
Definition: node.h:473
static uword flow_classify_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, flow_classify_table_id_t tid)
#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
flow_classify_main_t flow_classify_main
Definition: flow_classify.c:17
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1168
static uword vnet_classify_get_offset(vnet_classify_table_t *t, vnet_classify_entry_t *v)
flow_classify_error_t
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:153
u16 n_vectors
Definition: node.h:380
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:77
vlib_main_t * vm
Definition: buffer.c:294
#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
struct _vnet_classify_main vnet_classify_main_t
Definition: vnet_classify.h:70
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:492
vnet_classify_main_t vnet_classify_main
Definition: vnet_classify.c:22
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
vnet_classify_main_t * vnet_classify_main
Definition: flow_classify.h:44
vlib_node_registration_t ip4_flow_classify_node
(constructor) VLIB_REGISTER_NODE (ip4_flow_classify_node)
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:267
static uword ip4_flow_classify(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
#define vnet_buffer(b)
Definition: buffer.h:360
u8 data[0]
Packet data.
Definition: buffer.h:172
u16 flags
Copy of main node flags.
Definition: node.h:486
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:295
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:62
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:111
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
vnet_classify_entry_t * vnet_classify_find_entry(vnet_classify_table_t *t, u8 *h, u64 hash, f64 now)
Definition: defs.h:46