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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/*
* Copyright (C) 2017 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/jiffies.h>
#include <linux/skbuff.h>
#include <linux/wait.h>
#include "../nfp_app.h"
#include "../nfp_net.h"
#include "fw.h"
#include "main.h"
#define cmsg_warn(bpf, msg...) nn_dp_warn(&(bpf)->app->ctrl->dp, msg)
#define NFP_BPF_TAG_ALLOC_SPAN (U16_MAX / 4)
static bool nfp_bpf_all_tags_busy(struct nfp_app_bpf *bpf)
{
u16 used_tags;
used_tags = bpf->tag_alloc_next - bpf->tag_alloc_last;
return used_tags > NFP_BPF_TAG_ALLOC_SPAN;
}
static int nfp_bpf_alloc_tag(struct nfp_app_bpf *bpf)
{
/* All FW communication for BPF is request-reply. To make sure we
* don't reuse the message ID too early after timeout - limit the
* number of requests in flight.
*/
if (nfp_bpf_all_tags_busy(bpf)) {
cmsg_warn(bpf, "all FW request contexts busy!\n");
return -EAGAIN;
}
WARN_ON(__test_and_set_bit(bpf->tag_alloc_next, bpf->tag_allocator));
return bpf->tag_alloc_next++;
}
static void nfp_bpf_free_tag(struct nfp_app_bpf *bpf, u16 tag)
{
WARN_ON(!__test_and_clear_bit(tag, bpf->tag_allocator));
while (!test_bit(bpf->tag_alloc_last, bpf->tag_allocator) &&
bpf->tag_alloc_last != bpf->tag_alloc_next)
bpf->tag_alloc_last++;
}
static unsigned int nfp_bpf_cmsg_get_tag(struct sk_buff *skb)
{
struct cmsg_hdr *hdr;
hdr = (struct cmsg_hdr *)skb->data;
return be16_to_cpu(hdr->tag);
}
static struct sk_buff *__nfp_bpf_reply(struct nfp_app_bpf *bpf, u16 tag)
{
unsigned int msg_tag;
struct sk_buff *skb;
skb_queue_walk(&bpf->cmsg_replies, skb) {
msg_tag = nfp_bpf_cmsg_get_tag(skb);
if (msg_tag == tag) {
nfp_bpf_free_tag(bpf, tag);
__skb_unlink(skb, &bpf->cmsg_replies);
return skb;
}
}
return NULL;
}
static struct sk_buff *nfp_bpf_reply(struct nfp_app_bpf *bpf, u16 tag)
{
struct sk_buff *skb;
nfp_ctrl_lock(bpf->app->ctrl);
skb = __nfp_bpf_reply(bpf, tag);
nfp_ctrl_unlock(bpf->app->ctrl);
return skb;
}
static struct sk_buff *nfp_bpf_reply_drop_tag(struct nfp_app_bpf *bpf, u16 tag)
{
struct sk_buff *skb;
nfp_ctrl_lock(bpf->app->ctrl);
skb = __nfp_bpf_reply(bpf, tag);
if (!skb)
nfp_bpf_free_tag(bpf, tag);
nfp_ctrl_unlock(bpf->app->ctrl);
return skb;
}
static struct sk_buff *
nfp_bpf_cmsg_wait_reply(struct nfp_app_bpf *bpf, enum nfp_bpf_cmsg_type type,
int tag)
{
struct sk_buff *skb;
int err;
err = wait_event_interruptible_timeout(bpf->cmsg_wq,
skb = nfp_bpf_reply(bpf, tag),
msecs_to_jiffies(5000));
/* We didn't get a response - try last time and atomically drop
* the tag even if no response is matched.
*/
if (!skb)
skb = nfp_bpf_reply_drop_tag(bpf, tag);
if (err < 0) {
cmsg_warn(bpf, "%s waiting for response to 0x%02x: %d\n",
err == ERESTARTSYS ? "interrupted" : "error",
type, err);
return ERR_PTR(err);
}
if (!skb) {
cmsg_warn(bpf, "timeout waiting for response to 0x%02x\n",
type);
return ERR_PTR(-ETIMEDOUT);
}
return skb;
}
struct sk_buff *
nfp_bpf_cmsg_communicate(struct nfp_app_bpf *bpf, struct sk_buff *skb,
enum nfp_bpf_cmsg_type type, unsigned int reply_size)
{
struct cmsg_hdr *hdr;
int tag;
nfp_ctrl_lock(bpf->app->ctrl);
tag = nfp_bpf_alloc_tag(bpf);
if (tag < 0) {
nfp_ctrl_unlock(bpf->app->ctrl);
dev_kfree_skb_any(skb);
return ERR_PTR(tag);
}
hdr = (void *)skb->data;
hdr->ver = CMSG_MAP_ABI_VERSION;
hdr->type = type;
hdr->tag = cpu_to_be16(tag);
__nfp_app_ctrl_tx(bpf->app, skb);
nfp_ctrl_unlock(bpf->app->ctrl);
skb = nfp_bpf_cmsg_wait_reply(bpf, type, tag);
if (IS_ERR(skb))
return skb;
hdr = (struct cmsg_hdr *)skb->data;
/* 0 reply_size means caller will do the validation */
if (reply_size && skb->len != reply_size) {
cmsg_warn(bpf, "cmsg drop - wrong size %d != %d!\n",
skb->len, reply_size);
goto err_free;
}
if (hdr->type != __CMSG_REPLY(type)) {
cmsg_warn(bpf, "cmsg drop - wrong type 0x%02x != 0x%02lx!\n",
hdr->type, __CMSG_REPLY(type));
goto err_free;
}
return skb;
err_free:
dev_kfree_skb_any(skb);
return ERR_PTR(-EIO);
}
void nfp_bpf_ctrl_msg_rx(struct nfp_app *app, struct sk_buff *skb)
{
struct nfp_app_bpf *bpf = app->priv;
unsigned int tag;
if (unlikely(skb->len < sizeof(struct cmsg_reply_map_simple))) {
cmsg_warn(bpf, "cmsg drop - too short %d!\n", skb->len);
goto err_free;
}
nfp_ctrl_lock(bpf->app->ctrl);
tag = nfp_bpf_cmsg_get_tag(skb);
if (unlikely(!test_bit(tag, bpf->tag_allocator))) {
cmsg_warn(bpf, "cmsg drop - no one is waiting for tag %u!\n",
tag);
goto err_unlock;
}
__skb_queue_tail(&bpf->cmsg_replies, skb);
wake_up_interruptible_all(&bpf->cmsg_wq);
nfp_ctrl_unlock(bpf->app->ctrl);
return;
err_unlock:
nfp_ctrl_unlock(bpf->app->ctrl);
err_free:
dev_kfree_skb_any(skb);
}
|
