Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2/* Copyright (C) 2019 Netronome Systems, Inc. */
3
4#include <net/devlink.h>
5
6#include "nfpcore/nfp.h"
7#include "nfpcore/nfp_nsp.h"
8#include "nfp_main.h"
9
10/**
11 * struct nfp_devlink_param_u8_arg - Devlink u8 parameter get/set arguments
12 * @hwinfo_name: HWinfo key name
13 * @default_hi_val: Default HWinfo value if HWinfo doesn't exist
14 * @invalid_dl_val: Devlink value to use if HWinfo is unknown/invalid.
15 * -errno if there is no unknown/invalid value available
16 * @hi_to_dl: HWinfo to devlink value mapping
17 * @dl_to_hi: Devlink to hwinfo value mapping
18 * @max_dl_val: Maximum devlink value supported, for validation only
19 * @max_hi_val: Maximum HWinfo value supported, for validation only
20 */
21struct nfp_devlink_param_u8_arg {
22 const char *hwinfo_name;
23 const char *default_hi_val;
24 int invalid_dl_val;
25 u8 hi_to_dl[4];
26 u8 dl_to_hi[4];
27 u8 max_dl_val;
28 u8 max_hi_val;
29};
30
31static const struct nfp_devlink_param_u8_arg nfp_devlink_u8_args[] = {
32 [DEVLINK_PARAM_GENERIC_ID_FW_LOAD_POLICY] = {
33 .hwinfo_name = "app_fw_from_flash",
34 .default_hi_val = NFP_NSP_APP_FW_LOAD_DEFAULT,
35 .invalid_dl_val =
36 DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_UNKNOWN,
37 .hi_to_dl = {
38 [NFP_NSP_APP_FW_LOAD_DISK] =
39 DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK,
40 [NFP_NSP_APP_FW_LOAD_FLASH] =
41 DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_FLASH,
42 [NFP_NSP_APP_FW_LOAD_PREF] =
43 DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DRIVER,
44 },
45 .dl_to_hi = {
46 [DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DRIVER] =
47 NFP_NSP_APP_FW_LOAD_PREF,
48 [DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_FLASH] =
49 NFP_NSP_APP_FW_LOAD_FLASH,
50 [DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK] =
51 NFP_NSP_APP_FW_LOAD_DISK,
52 },
53 .max_dl_val = DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK,
54 .max_hi_val = NFP_NSP_APP_FW_LOAD_PREF,
55 },
56 [DEVLINK_PARAM_GENERIC_ID_RESET_DEV_ON_DRV_PROBE] = {
57 .hwinfo_name = "abi_drv_reset",
58 .default_hi_val = NFP_NSP_DRV_RESET_DEFAULT,
59 .invalid_dl_val =
60 DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_UNKNOWN,
61 .hi_to_dl = {
62 [NFP_NSP_DRV_RESET_ALWAYS] =
63 DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_ALWAYS,
64 [NFP_NSP_DRV_RESET_NEVER] =
65 DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_NEVER,
66 [NFP_NSP_DRV_RESET_DISK] =
67 DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_DISK,
68 },
69 .dl_to_hi = {
70 [DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_ALWAYS] =
71 NFP_NSP_DRV_RESET_ALWAYS,
72 [DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_NEVER] =
73 NFP_NSP_DRV_RESET_NEVER,
74 [DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_DISK] =
75 NFP_NSP_DRV_RESET_DISK,
76 },
77 .max_dl_val = DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_DISK,
78 .max_hi_val = NFP_NSP_DRV_RESET_NEVER,
79 }
80};
81
82static int
83nfp_devlink_param_u8_get(struct devlink *devlink, u32 id,
84 struct devlink_param_gset_ctx *ctx,
85 struct netlink_ext_ack *extack)
86{
87 const struct nfp_devlink_param_u8_arg *arg;
88 struct nfp_pf *pf = devlink_priv(devlink);
89 struct nfp_nsp *nsp;
90 char hwinfo[32];
91 long value;
92 int err;
93
94 if (id >= ARRAY_SIZE(nfp_devlink_u8_args))
95 return -EOPNOTSUPP;
96
97 arg = &nfp_devlink_u8_args[id];
98
99 nsp = nfp_nsp_open(pf->cpp);
100 if (IS_ERR(nsp)) {
101 err = PTR_ERR(nsp);
102 nfp_warn(pf->cpp, "can't access NSP: %d\n", err);
103 return err;
104 }
105
106 snprintf(hwinfo, sizeof(hwinfo), arg->hwinfo_name);
107 err = nfp_nsp_hwinfo_lookup_optional(nsp, hwinfo, sizeof(hwinfo),
108 arg->default_hi_val);
109 if (err) {
110 nfp_warn(pf->cpp, "HWinfo lookup failed: %d\n", err);
111 goto exit_close_nsp;
112 }
113
114 err = kstrtol(hwinfo, 0, &value);
115 if (err || value < 0 || value > arg->max_hi_val) {
116 nfp_warn(pf->cpp, "HWinfo '%s' value %li invalid\n",
117 arg->hwinfo_name, value);
118
119 if (arg->invalid_dl_val >= 0)
120 ctx->val.vu8 = arg->invalid_dl_val;
121 else
122 err = arg->invalid_dl_val;
123
124 goto exit_close_nsp;
125 }
126
127 ctx->val.vu8 = arg->hi_to_dl[value];
128
129exit_close_nsp:
130 nfp_nsp_close(nsp);
131 return err;
132}
133
134static int
135nfp_devlink_param_u8_set(struct devlink *devlink, u32 id,
136 struct devlink_param_gset_ctx *ctx,
137 struct netlink_ext_ack *extack)
138{
139 const struct nfp_devlink_param_u8_arg *arg;
140 struct nfp_pf *pf = devlink_priv(devlink);
141 struct nfp_nsp *nsp;
142 char hwinfo[32];
143 int err;
144
145 if (id >= ARRAY_SIZE(nfp_devlink_u8_args))
146 return -EOPNOTSUPP;
147
148 arg = &nfp_devlink_u8_args[id];
149
150 nsp = nfp_nsp_open(pf->cpp);
151 if (IS_ERR(nsp)) {
152 err = PTR_ERR(nsp);
153 nfp_warn(pf->cpp, "can't access NSP: %d\n", err);
154 return err;
155 }
156
157 /* Note the value has already been validated. */
158 snprintf(hwinfo, sizeof(hwinfo), "%s=%u",
159 arg->hwinfo_name, arg->dl_to_hi[ctx->val.vu8]);
160 err = nfp_nsp_hwinfo_set(nsp, hwinfo, sizeof(hwinfo));
161 if (err) {
162 nfp_warn(pf->cpp, "HWinfo set failed: %d\n", err);
163 goto exit_close_nsp;
164 }
165
166exit_close_nsp:
167 nfp_nsp_close(nsp);
168 return err;
169}
170
171static int
172nfp_devlink_param_u8_validate(struct devlink *devlink, u32 id,
173 union devlink_param_value val,
174 struct netlink_ext_ack *extack)
175{
176 const struct nfp_devlink_param_u8_arg *arg;
177
178 if (id >= ARRAY_SIZE(nfp_devlink_u8_args))
179 return -EOPNOTSUPP;
180
181 arg = &nfp_devlink_u8_args[id];
182
183 if (val.vu8 > arg->max_dl_val) {
184 NL_SET_ERR_MSG_MOD(extack, "parameter out of range");
185 return -EINVAL;
186 }
187
188 if (val.vu8 == arg->invalid_dl_val) {
189 NL_SET_ERR_MSG_MOD(extack, "unknown/invalid value specified");
190 return -EINVAL;
191 }
192
193 return 0;
194}
195
196static const struct devlink_param nfp_devlink_params[] = {
197 DEVLINK_PARAM_GENERIC(FW_LOAD_POLICY,
198 BIT(DEVLINK_PARAM_CMODE_PERMANENT),
199 nfp_devlink_param_u8_get,
200 nfp_devlink_param_u8_set,
201 nfp_devlink_param_u8_validate),
202 DEVLINK_PARAM_GENERIC(RESET_DEV_ON_DRV_PROBE,
203 BIT(DEVLINK_PARAM_CMODE_PERMANENT),
204 nfp_devlink_param_u8_get,
205 nfp_devlink_param_u8_set,
206 nfp_devlink_param_u8_validate),
207};
208
209static int nfp_devlink_supports_params(struct nfp_pf *pf)
210{
211 struct nfp_nsp *nsp;
212 bool supported;
213 int err;
214
215 nsp = nfp_nsp_open(pf->cpp);
216 if (IS_ERR(nsp)) {
217 err = PTR_ERR(nsp);
218 dev_err(&pf->pdev->dev, "Failed to access the NSP: %d\n", err);
219 return err;
220 }
221
222 supported = nfp_nsp_has_hwinfo_lookup(nsp) &&
223 nfp_nsp_has_hwinfo_set(nsp);
224
225 nfp_nsp_close(nsp);
226 return supported;
227}
228
229int nfp_devlink_params_register(struct nfp_pf *pf)
230{
231 struct devlink *devlink = priv_to_devlink(pf);
232 int err;
233
234 err = nfp_devlink_supports_params(pf);
235 if (err <= 0)
236 return err;
237
238 return devl_params_register(devlink, nfp_devlink_params,
239 ARRAY_SIZE(nfp_devlink_params));
240}
241
242void nfp_devlink_params_unregister(struct nfp_pf *pf)
243{
244 int err;
245
246 err = nfp_devlink_supports_params(pf);
247 if (err <= 0)
248 return;
249
250 devl_params_unregister(priv_to_devlink(pf), nfp_devlink_params,
251 ARRAY_SIZE(nfp_devlink_params));
252}