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231 lines · 6.4 KiB

1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2019 Mellanox Technologies. All rights reserved */
3
4#include <linux/debugfs.h>
5#include <linux/err.h>
6#include <linux/kernel.h>
7#include <linux/slab.h>
8
9#include "netdevsim.h"
10
11static int
12nsim_dev_empty_reporter_dump(struct devlink_health_reporter *reporter,
13 struct devlink_fmsg *fmsg, void *priv_ctx,
14 struct netlink_ext_ack *extack)
15{
16 return 0;
17}
18
19static int
20nsim_dev_empty_reporter_diagnose(struct devlink_health_reporter *reporter,
21 struct devlink_fmsg *fmsg,
22 struct netlink_ext_ack *extack)
23{
24 return 0;
25}
26
27static const
28struct devlink_health_reporter_ops nsim_dev_empty_reporter_ops = {
29 .name = "empty",
30 .dump = nsim_dev_empty_reporter_dump,
31 .diagnose = nsim_dev_empty_reporter_diagnose,
32};
33
34struct nsim_dev_dummy_reporter_ctx {
35 char *break_msg;
36};
37
38static int
39nsim_dev_dummy_reporter_recover(struct devlink_health_reporter *reporter,
40 void *priv_ctx,
41 struct netlink_ext_ack *extack)
42{
43 struct nsim_dev_health *health = devlink_health_reporter_priv(reporter);
44 struct nsim_dev_dummy_reporter_ctx *ctx = priv_ctx;
45
46 if (health->fail_recover) {
47 /* For testing purposes, user set debugfs fail_recover
48 * value to true. Fail right away.
49 */
50 NL_SET_ERR_MSG_MOD(extack, "User setup the recover to fail for testing purposes");
51 return -EINVAL;
52 }
53 if (ctx) {
54 kfree(health->recovered_break_msg);
55 health->recovered_break_msg = kstrdup(ctx->break_msg,
56 GFP_KERNEL);
57 if (!health->recovered_break_msg)
58 return -ENOMEM;
59 }
60 return 0;
61}
62
63static int nsim_dev_dummy_fmsg_put(struct devlink_fmsg *fmsg, u32 binary_len)
64{
65 char *binary;
66 int i;
67
68 devlink_fmsg_bool_pair_put(fmsg, "test_bool", true);
69 devlink_fmsg_u8_pair_put(fmsg, "test_u8", 1);
70 devlink_fmsg_u32_pair_put(fmsg, "test_u32", 3);
71 devlink_fmsg_u64_pair_put(fmsg, "test_u64", 4);
72 devlink_fmsg_string_pair_put(fmsg, "test_string", "somestring");
73
74 binary = kmalloc(binary_len, GFP_KERNEL | __GFP_NOWARN);
75 if (!binary)
76 return -ENOMEM;
77 get_random_bytes(binary, binary_len);
78 devlink_fmsg_binary_pair_put(fmsg, "test_binary", binary, binary_len);
79 kfree(binary);
80
81 devlink_fmsg_pair_nest_start(fmsg, "test_nest");
82 devlink_fmsg_obj_nest_start(fmsg);
83 devlink_fmsg_bool_pair_put(fmsg, "nested_test_bool", false);
84 devlink_fmsg_u8_pair_put(fmsg, "nested_test_u8", false);
85 devlink_fmsg_obj_nest_end(fmsg);
86 devlink_fmsg_pair_nest_end(fmsg);
87 devlink_fmsg_arr_pair_nest_end(fmsg);
88 devlink_fmsg_arr_pair_nest_start(fmsg, "test_u32_array");
89
90 for (i = 0; i < 10; i++)
91 devlink_fmsg_u32_put(fmsg, i);
92 devlink_fmsg_arr_pair_nest_end(fmsg);
93 devlink_fmsg_arr_pair_nest_start(fmsg, "test_array_of_objects");
94
95 for (i = 0; i < 10; i++) {
96 devlink_fmsg_obj_nest_start(fmsg);
97 devlink_fmsg_bool_pair_put(fmsg, "in_array_nested_test_bool",
98 false);
99 devlink_fmsg_u8_pair_put(fmsg, "in_array_nested_test_u8", i);
100 devlink_fmsg_obj_nest_end(fmsg);
101 }
102 devlink_fmsg_arr_pair_nest_end(fmsg);
103
104 return 0;
105}
106
107static int
108nsim_dev_dummy_reporter_dump(struct devlink_health_reporter *reporter,
109 struct devlink_fmsg *fmsg, void *priv_ctx,
110 struct netlink_ext_ack *extack)
111{
112 struct nsim_dev_health *health = devlink_health_reporter_priv(reporter);
113 struct nsim_dev_dummy_reporter_ctx *ctx = priv_ctx;
114
115 if (ctx)
116 devlink_fmsg_string_pair_put(fmsg, "break_message", ctx->break_msg);
117
118 return nsim_dev_dummy_fmsg_put(fmsg, health->binary_len);
119}
120
121static int
122nsim_dev_dummy_reporter_diagnose(struct devlink_health_reporter *reporter,
123 struct devlink_fmsg *fmsg,
124 struct netlink_ext_ack *extack)
125{
126 struct nsim_dev_health *health = devlink_health_reporter_priv(reporter);
127
128 if (health->recovered_break_msg)
129 devlink_fmsg_string_pair_put(fmsg, "recovered_break_message",
130 health->recovered_break_msg);
131
132 return nsim_dev_dummy_fmsg_put(fmsg, health->binary_len);
133}
134
135static const
136struct devlink_health_reporter_ops nsim_dev_dummy_reporter_ops = {
137 .name = "dummy",
138 .recover = nsim_dev_dummy_reporter_recover,
139 .dump = nsim_dev_dummy_reporter_dump,
140 .diagnose = nsim_dev_dummy_reporter_diagnose,
141};
142
143static ssize_t nsim_dev_health_break_write(struct file *file,
144 const char __user *data,
145 size_t count, loff_t *ppos)
146{
147 struct nsim_dev_health *health = file->private_data;
148 struct nsim_dev_dummy_reporter_ctx ctx;
149 char *break_msg;
150 int err;
151
152 if (count == 0 || count > PAGE_SIZE)
153 return -EINVAL;
154 break_msg = memdup_user_nul(data, count);
155 if (IS_ERR(break_msg))
156 return PTR_ERR(break_msg);
157
158 if (break_msg[count - 1] == '\n')
159 break_msg[count - 1] = '\0';
160
161 ctx.break_msg = break_msg;
162 err = devlink_health_report(health->dummy_reporter, break_msg, &ctx);
163 if (err)
164 goto out;
165
166out:
167 kfree(break_msg);
168 return err ?: count;
169}
170
171static const struct file_operations nsim_dev_health_break_fops = {
172 .open = simple_open,
173 .write = nsim_dev_health_break_write,
174 .llseek = generic_file_llseek,
175 .owner = THIS_MODULE,
176};
177
178int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink)
179{
180 struct nsim_dev_health *health = &nsim_dev->health;
181 int err;
182
183 health->empty_reporter =
184 devl_health_reporter_create(devlink,
185 &nsim_dev_empty_reporter_ops,
186 health);
187 if (IS_ERR(health->empty_reporter))
188 return PTR_ERR(health->empty_reporter);
189
190 health->dummy_reporter =
191 devl_health_reporter_create(devlink,
192 &nsim_dev_dummy_reporter_ops,
193 health);
194 if (IS_ERR(health->dummy_reporter)) {
195 err = PTR_ERR(health->dummy_reporter);
196 goto err_empty_reporter_destroy;
197 }
198
199 health->ddir = debugfs_create_dir("health", nsim_dev->ddir);
200 if (IS_ERR(health->ddir)) {
201 err = PTR_ERR(health->ddir);
202 goto err_dummy_reporter_destroy;
203 }
204
205 health->recovered_break_msg = NULL;
206 debugfs_create_file("break_health", 0200, health->ddir, health,
207 &nsim_dev_health_break_fops);
208 health->binary_len = 16;
209 debugfs_create_u32("binary_len", 0600, health->ddir,
210 &health->binary_len);
211 health->fail_recover = false;
212 debugfs_create_bool("fail_recover", 0600, health->ddir,
213 &health->fail_recover);
214 return 0;
215
216err_dummy_reporter_destroy:
217 devl_health_reporter_destroy(health->dummy_reporter);
218err_empty_reporter_destroy:
219 devl_health_reporter_destroy(health->empty_reporter);
220 return err;
221}
222
223void nsim_dev_health_exit(struct nsim_dev *nsim_dev)
224{
225 struct nsim_dev_health *health = &nsim_dev->health;
226
227 debugfs_remove_recursive(health->ddir);
228 kfree(health->recovered_break_msg);
229 devl_health_reporter_destroy(health->dummy_reporter);
230 devl_health_reporter_destroy(health->empty_reporter);
231}