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  */
21 struct 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 
31 static 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 
82 static int
83 nfp_devlink_param_u8_get(struct devlink *devlink, u32 id,
84 			 struct devlink_param_gset_ctx *ctx)
85 {
86 	const struct nfp_devlink_param_u8_arg *arg;
87 	struct nfp_pf *pf = devlink_priv(devlink);
88 	struct nfp_nsp *nsp;
89 	char hwinfo[32];
90 	long value;
91 	int err;
92 
93 	if (id >= ARRAY_SIZE(nfp_devlink_u8_args))
94 		return -EOPNOTSUPP;
95 
96 	arg = &nfp_devlink_u8_args[id];
97 
98 	nsp = nfp_nsp_open(pf->cpp);
99 	if (IS_ERR(nsp)) {
100 		err = PTR_ERR(nsp);
101 		nfp_warn(pf->cpp, "can't access NSP: %d\n", err);
102 		return err;
103 	}
104 
105 	snprintf(hwinfo, sizeof(hwinfo), arg->hwinfo_name);
106 	err = nfp_nsp_hwinfo_lookup_optional(nsp, hwinfo, sizeof(hwinfo),
107 					     arg->default_hi_val);
108 	if (err) {
109 		nfp_warn(pf->cpp, "HWinfo lookup failed: %d\n", err);
110 		goto exit_close_nsp;
111 	}
112 
113 	err = kstrtol(hwinfo, 0, &value);
114 	if (err || value < 0 || value > arg->max_hi_val) {
115 		nfp_warn(pf->cpp, "HWinfo '%s' value %li invalid\n",
116 			 arg->hwinfo_name, value);
117 
118 		if (arg->invalid_dl_val >= 0)
119 			ctx->val.vu8 = arg->invalid_dl_val;
120 		else
121 			err = arg->invalid_dl_val;
122 
123 		goto exit_close_nsp;
124 	}
125 
126 	ctx->val.vu8 = arg->hi_to_dl[value];
127 
128 exit_close_nsp:
129 	nfp_nsp_close(nsp);
130 	return err;
131 }
132 
133 static int
134 nfp_devlink_param_u8_set(struct devlink *devlink, u32 id,
135 			 struct devlink_param_gset_ctx *ctx)
136 {
137 	const struct nfp_devlink_param_u8_arg *arg;
138 	struct nfp_pf *pf = devlink_priv(devlink);
139 	struct nfp_nsp *nsp;
140 	char hwinfo[32];
141 	int err;
142 
143 	if (id >= ARRAY_SIZE(nfp_devlink_u8_args))
144 		return -EOPNOTSUPP;
145 
146 	arg = &nfp_devlink_u8_args[id];
147 
148 	nsp = nfp_nsp_open(pf->cpp);
149 	if (IS_ERR(nsp)) {
150 		err = PTR_ERR(nsp);
151 		nfp_warn(pf->cpp, "can't access NSP: %d\n", err);
152 		return err;
153 	}
154 
155 	/* Note the value has already been validated. */
156 	snprintf(hwinfo, sizeof(hwinfo), "%s=%u",
157 		 arg->hwinfo_name, arg->dl_to_hi[ctx->val.vu8]);
158 	err = nfp_nsp_hwinfo_set(nsp, hwinfo, sizeof(hwinfo));
159 	if (err) {
160 		nfp_warn(pf->cpp, "HWinfo set failed: %d\n", err);
161 		goto exit_close_nsp;
162 	}
163 
164 exit_close_nsp:
165 	nfp_nsp_close(nsp);
166 	return err;
167 }
168 
169 static int
170 nfp_devlink_param_u8_validate(struct devlink *devlink, u32 id,
171 			      union devlink_param_value val,
172 			      struct netlink_ext_ack *extack)
173 {
174 	const struct nfp_devlink_param_u8_arg *arg;
175 
176 	if (id >= ARRAY_SIZE(nfp_devlink_u8_args))
177 		return -EOPNOTSUPP;
178 
179 	arg = &nfp_devlink_u8_args[id];
180 
181 	if (val.vu8 > arg->max_dl_val) {
182 		NL_SET_ERR_MSG_MOD(extack, "parameter out of range");
183 		return -EINVAL;
184 	}
185 
186 	if (val.vu8 == arg->invalid_dl_val) {
187 		NL_SET_ERR_MSG_MOD(extack, "unknown/invalid value specified");
188 		return -EINVAL;
189 	}
190 
191 	return 0;
192 }
193 
194 static const struct devlink_param nfp_devlink_params[] = {
195 	DEVLINK_PARAM_GENERIC(FW_LOAD_POLICY,
196 			      BIT(DEVLINK_PARAM_CMODE_PERMANENT),
197 			      nfp_devlink_param_u8_get,
198 			      nfp_devlink_param_u8_set,
199 			      nfp_devlink_param_u8_validate),
200 	DEVLINK_PARAM_GENERIC(RESET_DEV_ON_DRV_PROBE,
201 			      BIT(DEVLINK_PARAM_CMODE_PERMANENT),
202 			      nfp_devlink_param_u8_get,
203 			      nfp_devlink_param_u8_set,
204 			      nfp_devlink_param_u8_validate),
205 };
206 
207 static int nfp_devlink_supports_params(struct nfp_pf *pf)
208 {
209 	struct nfp_nsp *nsp;
210 	bool supported;
211 	int err;
212 
213 	nsp = nfp_nsp_open(pf->cpp);
214 	if (IS_ERR(nsp)) {
215 		err = PTR_ERR(nsp);
216 		dev_err(&pf->pdev->dev, "Failed to access the NSP: %d\n", err);
217 		return err;
218 	}
219 
220 	supported = nfp_nsp_has_hwinfo_lookup(nsp) &&
221 		    nfp_nsp_has_hwinfo_set(nsp);
222 
223 	nfp_nsp_close(nsp);
224 	return supported;
225 }
226 
227 int nfp_devlink_params_register(struct nfp_pf *pf)
228 {
229 	struct devlink *devlink = priv_to_devlink(pf);
230 	int err;
231 
232 	err = nfp_devlink_supports_params(pf);
233 	if (err <= 0)
234 		return err;
235 
236 	return devlink_params_register(devlink, nfp_devlink_params,
237 				       ARRAY_SIZE(nfp_devlink_params));
238 }
239 
240 void nfp_devlink_params_unregister(struct nfp_pf *pf)
241 {
242 	int err;
243 
244 	err = nfp_devlink_supports_params(pf);
245 	if (err <= 0)
246 		return;
247 
248 	devlink_params_unregister(priv_to_devlink(pf), nfp_devlink_params,
249 				  ARRAY_SIZE(nfp_devlink_params));
250 }
251