FD.io VPP  v19.01.3-6-g70449b9b9
Vector Packet Processing
output.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  * pg_output.c: packet generator output
17  *
18  * Copyright (c) 2008 Eliot Dresselhaus
19  *
20  * Permission is hereby granted, free of charge, to any person obtaining
21  * a copy of this software and associated documentation files (the
22  * "Software"), to deal in the Software without restriction, including
23  * without limitation the rights to use, copy, modify, merge, publish,
24  * distribute, sublicense, and/or sell copies of the Software, and to
25  * permit persons to whom the Software is furnished to do so, subject to
26  * the following conditions:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
31  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38  */
39 
40 #include <vppinfra/string.h>
41 #include <vlib/vlib.h>
42 #include <vnet/vnet.h>
43 #include <vnet/pg/pg.h>
44 #include <vnet/ethernet/ethernet.h>
45 
46 uword
48 {
49  pg_main_t *pg = &pg_main;
50  u32 *buffers = vlib_frame_vector_args (frame);
51  uword n_buffers = frame->n_vectors;
52  uword n_left = n_buffers;
53  vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
55 
56  if (PREDICT_FALSE (pif->lockp != 0))
57  while (clib_atomic_test_and_set (pif->lockp))
58  ;
59 
60  while (n_left > 0)
61  {
62  n_left--;
63  u32 bi0 = buffers[0];
64  vlib_buffer_t *b = vlib_get_buffer (vm, bi0);
65  buffers++;
66 
67  if (b->flags & VLIB_BUFFER_IS_TRACED)
68  {
69  pg_output_trace_t *t = vlib_add_trace (vm, node, b, sizeof (*t));
70  t->buffer_index = bi0;
71  clib_memcpy_fast (&t->buffer, b,
72  sizeof (b[0]) - sizeof (b->pre_data));
74  sizeof (t->buffer.pre_data));
75  }
76 
77  if (pif->pcap_file_name != 0)
78  pcap_add_buffer (&pif->pcap_main, vm, bi0, ETHERNET_MAX_PACKET_BYTES);
79  }
80  if (pif->pcap_file_name != 0)
81  pcap_write (&pif->pcap_main);
82 
83 
84  vlib_buffer_free (vm, vlib_frame_vector_args (frame), n_buffers);
85  if (PREDICT_FALSE (pif->lockp != 0))
86  clib_atomic_release (pif->lockp);
87 
88  return n_buffers;
89 }
90 
91 /*
92  * fd.io coding-style-patch-verification: ON
93  *
94  * Local Variables:
95  * eval: (c-set-style "gnu")
96  * End:
97  */
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:529
u8 runtime_data[0]
Function dependent node-runtime data.
Definition: node.h:545
vlib_buffer_t buffer
Definition: pg.h:384
Definition: pg.h:314
Optimized string handling code, including c11-compliant "safe C library" variants.
#define clib_memcpy_fast(a, b, c)
Definition: string.h:81
u32 buffer_index
Definition: pg.h:385
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:110
u8 pre_data[VLIB_BUFFER_PRE_DATA_SIZE]
Space for inserting data before buffer start.
Definition: buffer.h:168
unsigned int u32
Definition: types.h:88
#define clib_atomic_test_and_set(a)
Definition: atomics.h:40
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:511
#define clib_atomic_release(a)
Definition: atomics.h:41
#define PREDICT_FALSE(x)
Definition: clib.h:111
u16 n_vectors
Definition: node.h:420
vlib_main_t * vm
Definition: buffer.c:301
clib_error_t * pcap_write(pcap_main_t *pm)
Write PCAP file.
Definition: pcap.c:89
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
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:244
uword pg_output(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: output.c:47
pg_main_t pg_main
Definition: init.c:44
u8 data[0]
Packet data.
Definition: buffer.h:176
#define ETHERNET_MAX_PACKET_BYTES
Definition: ethernet.h:166
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:117
static void pcap_add_buffer(pcap_main_t *pm, struct vlib_main_t *vm, u32 buffer_index, u32 n_bytes_in_trace)
Add buffer (vlib_buffer_t) to the trace.
Definition: pcap_funcs.h:63
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:62
pg_interface_t * interfaces
Definition: pg.h:326