1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/* SPDX-License-Identifier: Apache-2.0
* Copyright (c) 2022 Cisco Systems, Inc.
*/
#include <vlib/vlib.h>
#include <vlib/physmem_funcs.h>
#include <vlib/dma/dma.h>
static clib_error_t *
show_dma_backends_command_fn (vlib_main_t *vm, unformat_input_t *input,
vlib_cli_command_t *cmd)
{
vlib_dma_main_t *dm = &vlib_dma_main;
if (vec_len (dm->backends))
{
vlib_dma_backend_t *b;
vec_foreach (b, dm->backends)
vlib_cli_output (vm, "%s", b->name);
}
else
vlib_cli_output (vm, "No active DMA backends");
return 0;
}
VLIB_CLI_COMMAND (avf_create_command, static) = {
.path = "show dma backends",
.short_help = "show dma backends",
.function = show_dma_backends_command_fn,
};
static void
test_dma_cb_fn (vlib_main_t *vm, vlib_dma_batch_t *b)
{
fformat (stderr, "%s: cb %p cookie %lx\n", __func__, b,
vlib_dma_batch_get_cookie (vm, b));
}
static clib_error_t *
fill_random_data (void *buffer, uword size)
{
uword seed = random_default_seed ();
uword remain = size;
const uword p = clib_mem_get_page_size ();
uword offset = 0;
clib_random_buffer_t rb;
clib_random_buffer_init (&rb, seed);
while (remain > 0)
{
uword fill_size = clib_min (p, remain);
clib_random_buffer_fill (&rb, fill_size);
void *rbuf = clib_random_buffer_get_data (&rb, fill_size);
clib_memcpy_fast (buffer + offset, rbuf, fill_size);
clib_random_buffer_free (&rb);
offset += fill_size;
remain -= fill_size;
}
return 0;
}
static clib_error_t *
test_dma_command_fn (vlib_main_t *vm, unformat_input_t *input,
vlib_cli_command_t *cmd)
{
clib_error_t *err = 0;
vlib_dma_batch_t *b;
int config_index = -1;
u32 rsz, n_alloc, v;
u8 *from = 0, *to = 0;
vlib_dma_config_t cfg = { .max_transfers = 256,
.max_transfer_size = 4096,
.callback_fn = test_dma_cb_fn };
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "transfers %u", &v))
cfg.max_transfers = v;
else if (unformat (input, "size %u", &v))
cfg.max_transfer_size = v;
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
if ((config_index = vlib_dma_config_add (vm, &cfg)) < 0)
{
err = clib_error_return (0, "Unable to allocate dma config");
return err;
}
rsz = round_pow2 (cfg.max_transfer_size, CLIB_CACHE_LINE_BYTES);
n_alloc = rsz * cfg.max_transfers * 2;
if ((from = vlib_physmem_alloc_aligned_on_numa (
vm, n_alloc, CLIB_CACHE_LINE_BYTES, vm->numa_node)) == 0)
{
err = clib_error_return (0, "Unable to allocate %u bytes of physmem",
n_alloc);
return err;
}
to = from + n_alloc / 2;
u32 port_allocator_seed;
fill_random_data (from, (uword) cfg.max_transfers * rsz);
b = vlib_dma_batch_new (vm, config_index);
vlib_dma_batch_set_cookie (vm, b, 0x12345678);
port_allocator_seed = clib_cpu_time_now ();
int transfers = random_u32 (&port_allocator_seed) % cfg.max_transfers;
if (!transfers)
transfers = 1;
for (int i = 0; i < transfers; i++)
vlib_dma_batch_add (vm, b, to + i * rsz, from + i * rsz,
cfg.max_transfer_size);
vlib_dma_batch_submit (vm, b);
return err;
}
static clib_error_t *
test_show_dma_fn (vlib_main_t *vm, unformat_input_t *input,
vlib_cli_command_t *cmd)
{
clib_error_t *err = 0;
int config_index = 0;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "config %u", &config_index))
;
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
for (u32 i = 0; i < vlib_get_n_threads (); i++)
vlib_cli_output (vm, "Config %d %U", config_index, vlib_dma_config_info,
config_index, vlib_get_main_by_index (i));
return err;
}
VLIB_CLI_COMMAND (test_dma_command, static) = {
.path = "test dma",
.short_help = "test dma [transfers <x> size <x>]",
.function = test_dma_command_fn,
};
VLIB_CLI_COMMAND (show_dma_command, static) = {
.path = "show dma",
.short_help = "show dma [config <x>]",
.function = test_show_dma_fn,
};
|
