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(objp: health->recovered_break_msg);
55 health->recovered_break_msg = kstrdup(s: 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, name: "test_bool", value: true);
69 devlink_fmsg_u8_pair_put(fmsg, name: "test_u8", value: 1);
70 devlink_fmsg_u32_pair_put(fmsg, name: "test_u32", value: 3);
71 devlink_fmsg_u64_pair_put(fmsg, name: "test_u64", value: 4);
72 devlink_fmsg_string_pair_put(fmsg, name: "test_string", value: "somestring");
73
74 binary = kmalloc(size: binary_len, GFP_KERNEL | __GFP_NOWARN);
75 if (!binary)
76 return -ENOMEM;
77 get_random_bytes(buf: binary, len: binary_len);
78 devlink_fmsg_binary_pair_put(fmsg, name: "test_binary", value: binary, value_len: binary_len);
79 kfree(objp: binary);
80
81 devlink_fmsg_pair_nest_start(fmsg, name: "test_nest");
82 devlink_fmsg_obj_nest_start(fmsg);
83 devlink_fmsg_bool_pair_put(fmsg, name: "nested_test_bool", value: false);
84 devlink_fmsg_u8_pair_put(fmsg, name: "nested_test_u8", value: 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, name: "test_u32_array");
89
90 for (i = 0; i < 10; i++)
91 devlink_fmsg_u32_put(fmsg, value: i);
92 devlink_fmsg_arr_pair_nest_end(fmsg);
93 devlink_fmsg_arr_pair_nest_start(fmsg, name: "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, name: "in_array_nested_test_bool",
98 value: false);
99 devlink_fmsg_u8_pair_put(fmsg, name: "in_array_nested_test_u8", value: 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, name: "break_message", value: ctx->break_msg);
117
118 return nsim_dev_dummy_fmsg_put(fmsg, binary_len: 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, name: "recovered_break_message",
130 value: health->recovered_break_msg);
131
132 return nsim_dev_dummy_fmsg_put(fmsg, binary_len: 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 break_msg = memdup_user_nul(data, count);
153 if (IS_ERR(ptr: break_msg))
154 return PTR_ERR(ptr: break_msg);
155
156 if (break_msg[count - 1] == '\n')
157 break_msg[count - 1] = '\0';
158
159 ctx.break_msg = break_msg;
160 err = devlink_health_report(reporter: health->dummy_reporter, msg: break_msg, priv_ctx: &ctx);
161 if (err)
162 goto out;
163
164out:
165 kfree(objp: break_msg);
166 return err ?: count;
167}
168
169static const struct file_operations nsim_dev_health_break_fops = {
170 .open = simple_open,
171 .write = nsim_dev_health_break_write,
172 .llseek = generic_file_llseek,
173 .owner = THIS_MODULE,
174};
175
176int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink)
177{
178 struct nsim_dev_health *health = &nsim_dev->health;
179 int err;
180
181 health->empty_reporter =
182 devl_health_reporter_create(devlink,
183 ops: &nsim_dev_empty_reporter_ops,
184 graceful_period: 0, priv: health);
185 if (IS_ERR(ptr: health->empty_reporter))
186 return PTR_ERR(ptr: health->empty_reporter);
187
188 health->dummy_reporter =
189 devl_health_reporter_create(devlink,
190 ops: &nsim_dev_dummy_reporter_ops,
191 graceful_period: 0, priv: health);
192 if (IS_ERR(ptr: health->dummy_reporter)) {
193 err = PTR_ERR(ptr: health->dummy_reporter);
194 goto err_empty_reporter_destroy;
195 }
196
197 health->ddir = debugfs_create_dir(name: "health", parent: nsim_dev->ddir);
198 if (IS_ERR(ptr: health->ddir)) {
199 err = PTR_ERR(ptr: health->ddir);
200 goto err_dummy_reporter_destroy;
201 }
202
203 health->recovered_break_msg = NULL;
204 debugfs_create_file(name: "break_health", mode: 0200, parent: health->ddir, data: health,
205 fops: &nsim_dev_health_break_fops);
206 health->binary_len = 16;
207 debugfs_create_u32(name: "binary_len", mode: 0600, parent: health->ddir,
208 value: &health->binary_len);
209 health->fail_recover = false;
210 debugfs_create_bool(name: "fail_recover", mode: 0600, parent: health->ddir,
211 value: &health->fail_recover);
212 return 0;
213
214err_dummy_reporter_destroy:
215 devl_health_reporter_destroy(reporter: health->dummy_reporter);
216err_empty_reporter_destroy:
217 devl_health_reporter_destroy(reporter: health->empty_reporter);
218 return err;
219}
220
221void nsim_dev_health_exit(struct nsim_dev *nsim_dev)
222{
223 struct nsim_dev_health *health = &nsim_dev->health;
224
225 debugfs_remove_recursive(dentry: health->ddir);
226 kfree(objp: health->recovered_break_msg);
227 devl_health_reporter_destroy(reporter: health->dummy_reporter);
228 devl_health_reporter_destroy(reporter: health->empty_reporter);
229}
230

source code of linux/drivers/net/netdevsim/health.c