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{
 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
128exit_close_nsp:
129	nfp_nsp_close(nsp);
130	return err;
131}
132
133static int
134nfp_devlink_param_u8_set(struct devlink *devlink, u32 id,
135			 struct devlink_param_gset_ctx *ctx,
136			 struct netlink_ext_ack *extack)
137{
138	const struct nfp_devlink_param_u8_arg *arg;
139	struct nfp_pf *pf = devlink_priv(devlink);
140	struct nfp_nsp *nsp;
141	char hwinfo[32];
142	int err;
143
144	if (id >= ARRAY_SIZE(nfp_devlink_u8_args))
145		return -EOPNOTSUPP;
146
147	arg = &nfp_devlink_u8_args[id];
148
149	nsp = nfp_nsp_open(pf->cpp);
150	if (IS_ERR(nsp)) {
151		err = PTR_ERR(nsp);
152		nfp_warn(pf->cpp, "can't access NSP: %d\n", err);
153		return err;
154	}
155
156	/* Note the value has already been validated. */
157	snprintf(hwinfo, sizeof(hwinfo), "%s=%u",
158		 arg->hwinfo_name, arg->dl_to_hi[ctx->val.vu8]);
159	err = nfp_nsp_hwinfo_set(nsp, hwinfo, sizeof(hwinfo));
160	if (err) {
161		nfp_warn(pf->cpp, "HWinfo set failed: %d\n", err);
162		goto exit_close_nsp;
163	}
164
165exit_close_nsp:
166	nfp_nsp_close(nsp);
167	return err;
168}
169
170static int
171nfp_devlink_param_u8_validate(struct devlink *devlink, u32 id,
172			      union devlink_param_value val,
173			      struct netlink_ext_ack *extack)
174{
175	const struct nfp_devlink_param_u8_arg *arg;
176
177	if (id >= ARRAY_SIZE(nfp_devlink_u8_args))
178		return -EOPNOTSUPP;
179
180	arg = &nfp_devlink_u8_args[id];
181
182	if (val.vu8 > arg->max_dl_val) {
183		NL_SET_ERR_MSG_MOD(extack, "parameter out of range");
184		return -EINVAL;
185	}
186
187	if (val.vu8 == arg->invalid_dl_val) {
188		NL_SET_ERR_MSG_MOD(extack, "unknown/invalid value specified");
189		return -EINVAL;
190	}
191
192	return 0;
193}
194
195static const struct devlink_param nfp_devlink_params[] = {
196	DEVLINK_PARAM_GENERIC(FW_LOAD_POLICY,
197			      BIT(DEVLINK_PARAM_CMODE_PERMANENT),
198			      nfp_devlink_param_u8_get,
199			      nfp_devlink_param_u8_set,
200			      nfp_devlink_param_u8_validate),
201	DEVLINK_PARAM_GENERIC(RESET_DEV_ON_DRV_PROBE,
202			      BIT(DEVLINK_PARAM_CMODE_PERMANENT),
203			      nfp_devlink_param_u8_get,
204			      nfp_devlink_param_u8_set,
205			      nfp_devlink_param_u8_validate),
206};
207
208static int nfp_devlink_supports_params(struct nfp_pf *pf)
209{
210	struct nfp_nsp *nsp;
211	bool supported;
212	int err;
213
214	nsp = nfp_nsp_open(pf->cpp);
215	if (IS_ERR(nsp)) {
216		err = PTR_ERR(nsp);
217		dev_err(&pf->pdev->dev, "Failed to access the NSP: %d\n", err);
218		return err;
219	}
220
221	supported = nfp_nsp_has_hwinfo_lookup(nsp) &&
222		    nfp_nsp_has_hwinfo_set(nsp);
223
224	nfp_nsp_close(nsp);
225	return supported;
226}
227
228int nfp_devlink_params_register(struct nfp_pf *pf)
229{
230	struct devlink *devlink = priv_to_devlink(pf);
231	int err;
232
233	err = nfp_devlink_supports_params(pf);
234	if (err <= 0)
235		return err;
236
237	return devl_params_register(devlink, nfp_devlink_params,
238				    ARRAY_SIZE(nfp_devlink_params));
239}
240
241void nfp_devlink_params_unregister(struct nfp_pf *pf)
242{
243	int err;
244
245	err = nfp_devlink_supports_params(pf);
246	if (err <= 0)
247		return;
248
249	devl_params_unregister(priv_to_devlink(pf), nfp_devlink_params,
250			       ARRAY_SIZE(nfp_devlink_params));
251}