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-rw-r--r--net/devlink/param.c865
1 files changed, 865 insertions, 0 deletions
diff --git a/net/devlink/param.c b/net/devlink/param.c
new file mode 100644
index 000000000000..31275f9d4cb7
--- /dev/null
+++ b/net/devlink/param.c
@@ -0,0 +1,865 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
+ */
+
+#include "devl_internal.h"
+
+static const struct devlink_param devlink_param_generic[] = {
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_INT_ERR_RESET,
+ .name = DEVLINK_PARAM_GENERIC_INT_ERR_RESET_NAME,
+ .type = DEVLINK_PARAM_GENERIC_INT_ERR_RESET_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
+ .name = DEVLINK_PARAM_GENERIC_MAX_MACS_NAME,
+ .type = DEVLINK_PARAM_GENERIC_MAX_MACS_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_ENABLE_SRIOV,
+ .name = DEVLINK_PARAM_GENERIC_ENABLE_SRIOV_NAME,
+ .type = DEVLINK_PARAM_GENERIC_ENABLE_SRIOV_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_REGION_SNAPSHOT,
+ .name = DEVLINK_PARAM_GENERIC_REGION_SNAPSHOT_NAME,
+ .type = DEVLINK_PARAM_GENERIC_REGION_SNAPSHOT_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_IGNORE_ARI,
+ .name = DEVLINK_PARAM_GENERIC_IGNORE_ARI_NAME,
+ .type = DEVLINK_PARAM_GENERIC_IGNORE_ARI_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MAX,
+ .name = DEVLINK_PARAM_GENERIC_MSIX_VEC_PER_PF_MAX_NAME,
+ .type = DEVLINK_PARAM_GENERIC_MSIX_VEC_PER_PF_MAX_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MIN,
+ .name = DEVLINK_PARAM_GENERIC_MSIX_VEC_PER_PF_MIN_NAME,
+ .type = DEVLINK_PARAM_GENERIC_MSIX_VEC_PER_PF_MIN_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_FW_LOAD_POLICY,
+ .name = DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_NAME,
+ .type = DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_RESET_DEV_ON_DRV_PROBE,
+ .name = DEVLINK_PARAM_GENERIC_RESET_DEV_ON_DRV_PROBE_NAME,
+ .type = DEVLINK_PARAM_GENERIC_RESET_DEV_ON_DRV_PROBE_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_ENABLE_ROCE,
+ .name = DEVLINK_PARAM_GENERIC_ENABLE_ROCE_NAME,
+ .type = DEVLINK_PARAM_GENERIC_ENABLE_ROCE_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_ENABLE_REMOTE_DEV_RESET,
+ .name = DEVLINK_PARAM_GENERIC_ENABLE_REMOTE_DEV_RESET_NAME,
+ .type = DEVLINK_PARAM_GENERIC_ENABLE_REMOTE_DEV_RESET_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_ENABLE_ETH,
+ .name = DEVLINK_PARAM_GENERIC_ENABLE_ETH_NAME,
+ .type = DEVLINK_PARAM_GENERIC_ENABLE_ETH_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_ENABLE_RDMA,
+ .name = DEVLINK_PARAM_GENERIC_ENABLE_RDMA_NAME,
+ .type = DEVLINK_PARAM_GENERIC_ENABLE_RDMA_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_ENABLE_VNET,
+ .name = DEVLINK_PARAM_GENERIC_ENABLE_VNET_NAME,
+ .type = DEVLINK_PARAM_GENERIC_ENABLE_VNET_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_ENABLE_IWARP,
+ .name = DEVLINK_PARAM_GENERIC_ENABLE_IWARP_NAME,
+ .type = DEVLINK_PARAM_GENERIC_ENABLE_IWARP_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE,
+ .name = DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_NAME,
+ .type = DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_TYPE,
+ },
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_EVENT_EQ_SIZE,
+ .name = DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_NAME,
+ .type = DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_TYPE,
+ },
+};
+
+static int devlink_param_generic_verify(const struct devlink_param *param)
+{
+ /* verify it match generic parameter by id and name */
+ if (param->id > DEVLINK_PARAM_GENERIC_ID_MAX)
+ return -EINVAL;
+ if (strcmp(param->name, devlink_param_generic[param->id].name))
+ return -ENOENT;
+
+ WARN_ON(param->type != devlink_param_generic[param->id].type);
+
+ return 0;
+}
+
+static int devlink_param_driver_verify(const struct devlink_param *param)
+{
+ int i;
+
+ if (param->id <= DEVLINK_PARAM_GENERIC_ID_MAX)
+ return -EINVAL;
+ /* verify no such name in generic params */
+ for (i = 0; i <= DEVLINK_PARAM_GENERIC_ID_MAX; i++)
+ if (!strcmp(param->name, devlink_param_generic[i].name))
+ return -EEXIST;
+
+ return 0;
+}
+
+static struct devlink_param_item *
+devlink_param_find_by_name(struct xarray *params, const char *param_name)
+{
+ struct devlink_param_item *param_item;
+ unsigned long param_id;
+
+ xa_for_each(params, param_id, param_item) {
+ if (!strcmp(param_item->param->name, param_name))
+ return param_item;
+ }
+ return NULL;
+}
+
+static struct devlink_param_item *
+devlink_param_find_by_id(struct xarray *params, u32 param_id)
+{
+ return xa_load(params, param_id);
+}
+
+static bool
+devlink_param_cmode_is_supported(const struct devlink_param *param,
+ enum devlink_param_cmode cmode)
+{
+ return test_bit(cmode, &param->supported_cmodes);
+}
+
+static int devlink_param_get(struct devlink *devlink,
+ const struct devlink_param *param,
+ struct devlink_param_gset_ctx *ctx)
+{
+ if (!param->get)
+ return -EOPNOTSUPP;
+ return param->get(devlink, param->id, ctx);
+}
+
+static int devlink_param_set(struct devlink *devlink,
+ const struct devlink_param *param,
+ struct devlink_param_gset_ctx *ctx)
+{
+ if (!param->set)
+ return -EOPNOTSUPP;
+ return param->set(devlink, param->id, ctx);
+}
+
+static int
+devlink_param_type_to_nla_type(enum devlink_param_type param_type)
+{
+ switch (param_type) {
+ case DEVLINK_PARAM_TYPE_U8:
+ return NLA_U8;
+ case DEVLINK_PARAM_TYPE_U16:
+ return NLA_U16;
+ case DEVLINK_PARAM_TYPE_U32:
+ return NLA_U32;
+ case DEVLINK_PARAM_TYPE_STRING:
+ return NLA_STRING;
+ case DEVLINK_PARAM_TYPE_BOOL:
+ return NLA_FLAG;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int
+devlink_nl_param_value_fill_one(struct sk_buff *msg,
+ enum devlink_param_type type,
+ enum devlink_param_cmode cmode,
+ union devlink_param_value val)
+{
+ struct nlattr *param_value_attr;
+
+ param_value_attr = nla_nest_start_noflag(msg,
+ DEVLINK_ATTR_PARAM_VALUE);
+ if (!param_value_attr)
+ goto nla_put_failure;
+
+ if (nla_put_u8(msg, DEVLINK_ATTR_PARAM_VALUE_CMODE, cmode))
+ goto value_nest_cancel;
+
+ switch (type) {
+ case DEVLINK_PARAM_TYPE_U8:
+ if (nla_put_u8(msg, DEVLINK_ATTR_PARAM_VALUE_DATA, val.vu8))
+ goto value_nest_cancel;
+ break;
+ case DEVLINK_PARAM_TYPE_U16:
+ if (nla_put_u16(msg, DEVLINK_ATTR_PARAM_VALUE_DATA, val.vu16))
+ goto value_nest_cancel;
+ break;
+ case DEVLINK_PARAM_TYPE_U32:
+ if (nla_put_u32(msg, DEVLINK_ATTR_PARAM_VALUE_DATA, val.vu32))
+ goto value_nest_cancel;
+ break;
+ case DEVLINK_PARAM_TYPE_STRING:
+ if (nla_put_string(msg, DEVLINK_ATTR_PARAM_VALUE_DATA,
+ val.vstr))
+ goto value_nest_cancel;
+ break;
+ case DEVLINK_PARAM_TYPE_BOOL:
+ if (val.vbool &&
+ nla_put_flag(msg, DEVLINK_ATTR_PARAM_VALUE_DATA))
+ goto value_nest_cancel;
+ break;
+ }
+
+ nla_nest_end(msg, param_value_attr);
+ return 0;
+
+value_nest_cancel:
+ nla_nest_cancel(msg, param_value_attr);
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static int devlink_nl_param_fill(struct sk_buff *msg, struct devlink *devlink,
+ unsigned int port_index,
+ struct devlink_param_item *param_item,
+ enum devlink_command cmd,
+ u32 portid, u32 seq, int flags)
+{
+ union devlink_param_value param_value[DEVLINK_PARAM_CMODE_MAX + 1];
+ bool param_value_set[DEVLINK_PARAM_CMODE_MAX + 1] = {};
+ const struct devlink_param *param = param_item->param;
+ struct devlink_param_gset_ctx ctx;
+ struct nlattr *param_values_list;
+ struct nlattr *param_attr;
+ int nla_type;
+ void *hdr;
+ int err;
+ int i;
+
+ /* Get value from driver part to driverinit configuration mode */
+ for (i = 0; i <= DEVLINK_PARAM_CMODE_MAX; i++) {
+ if (!devlink_param_cmode_is_supported(param, i))
+ continue;
+ if (i == DEVLINK_PARAM_CMODE_DRIVERINIT) {
+ if (param_item->driverinit_value_new_valid)
+ param_value[i] = param_item->driverinit_value_new;
+ else if (param_item->driverinit_value_valid)
+ param_value[i] = param_item->driverinit_value;
+ else
+ return -EOPNOTSUPP;
+ } else {
+ ctx.cmode = i;
+ err = devlink_param_get(devlink, param, &ctx);
+ if (err)
+ return err;
+ param_value[i] = ctx.val;
+ }
+ param_value_set[i] = true;
+ }
+
+ hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ if (devlink_nl_put_handle(msg, devlink))
+ goto genlmsg_cancel;
+
+ if (cmd == DEVLINK_CMD_PORT_PARAM_GET ||
+ cmd == DEVLINK_CMD_PORT_PARAM_NEW ||
+ cmd == DEVLINK_CMD_PORT_PARAM_DEL)
+ if (nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX, port_index))
+ goto genlmsg_cancel;
+
+ param_attr = nla_nest_start_noflag(msg, DEVLINK_ATTR_PARAM);
+ if (!param_attr)
+ goto genlmsg_cancel;
+ if (nla_put_string(msg, DEVLINK_ATTR_PARAM_NAME, param->name))
+ goto param_nest_cancel;
+ if (param->generic && nla_put_flag(msg, DEVLINK_ATTR_PARAM_GENERIC))
+ goto param_nest_cancel;
+
+ nla_type = devlink_param_type_to_nla_type(param->type);
+ if (nla_type < 0)
+ goto param_nest_cancel;
+ if (nla_put_u8(msg, DEVLINK_ATTR_PARAM_TYPE, nla_type))
+ goto param_nest_cancel;
+
+ param_values_list = nla_nest_start_noflag(msg,
+ DEVLINK_ATTR_PARAM_VALUES_LIST);
+ if (!param_values_list)
+ goto param_nest_cancel;
+
+ for (i = 0; i <= DEVLINK_PARAM_CMODE_MAX; i++) {
+ if (!param_value_set[i])
+ continue;
+ err = devlink_nl_param_value_fill_one(msg, param->type,
+ i, param_value[i]);
+ if (err)
+ goto values_list_nest_cancel;
+ }
+
+ nla_nest_end(msg, param_values_list);
+ nla_nest_end(msg, param_attr);
+ genlmsg_end(msg, hdr);
+ return 0;
+
+values_list_nest_cancel:
+ nla_nest_end(msg, param_values_list);
+param_nest_cancel:
+ nla_nest_cancel(msg, param_attr);
+genlmsg_cancel:
+ genlmsg_cancel(msg, hdr);
+ return -EMSGSIZE;
+}
+
+static void devlink_param_notify(struct devlink *devlink,
+ unsigned int port_index,
+ struct devlink_param_item *param_item,
+ enum devlink_command cmd)
+{
+ struct sk_buff *msg;
+ int err;
+
+ WARN_ON(cmd != DEVLINK_CMD_PARAM_NEW && cmd != DEVLINK_CMD_PARAM_DEL &&
+ cmd != DEVLINK_CMD_PORT_PARAM_NEW &&
+ cmd != DEVLINK_CMD_PORT_PARAM_DEL);
+
+ /* devlink_notify_register() / devlink_notify_unregister()
+ * will replay the notifications if the params are added/removed
+ * outside of the lifetime of the instance.
+ */
+ if (!devl_is_registered(devlink))
+ return;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return;
+ err = devlink_nl_param_fill(msg, devlink, port_index, param_item, cmd,
+ 0, 0, 0);
+ if (err) {
+ nlmsg_free(msg);
+ return;
+ }
+
+ genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink),
+ msg, 0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
+}
+
+static void devlink_params_notify(struct devlink *devlink,
+ enum devlink_command cmd)
+{
+ struct devlink_param_item *param_item;
+ unsigned long param_id;
+
+ xa_for_each(&devlink->params, param_id, param_item)
+ devlink_param_notify(devlink, 0, param_item, cmd);
+}
+
+void devlink_params_notify_register(struct devlink *devlink)
+{
+ devlink_params_notify(devlink, DEVLINK_CMD_PARAM_NEW);
+}
+
+void devlink_params_notify_unregister(struct devlink *devlink)
+{
+ devlink_params_notify(devlink, DEVLINK_CMD_PARAM_DEL);
+}
+
+static int devlink_nl_param_get_dump_one(struct sk_buff *msg,
+ struct devlink *devlink,
+ struct netlink_callback *cb,
+ int flags)
+{
+ struct devlink_nl_dump_state *state = devlink_dump_state(cb);
+ struct devlink_param_item *param_item;
+ unsigned long param_id;
+ int err = 0;
+
+ xa_for_each_start(&devlink->params, param_id, param_item, state->idx) {
+ err = devlink_nl_param_fill(msg, devlink, 0, param_item,
+ DEVLINK_CMD_PARAM_GET,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, flags);
+ if (err == -EOPNOTSUPP) {
+ err = 0;
+ } else if (err) {
+ state->idx = param_id;
+ break;
+ }
+ }
+
+ return err;
+}
+
+int devlink_nl_param_get_dumpit(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ return devlink_nl_dumpit(skb, cb, devlink_nl_param_get_dump_one);
+}
+
+static int
+devlink_param_type_get_from_info(struct genl_info *info,
+ enum devlink_param_type *param_type)
+{
+ if (GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_PARAM_TYPE))
+ return -EINVAL;
+
+ switch (nla_get_u8(info->attrs[DEVLINK_ATTR_PARAM_TYPE])) {
+ case NLA_U8:
+ *param_type = DEVLINK_PARAM_TYPE_U8;
+ break;
+ case NLA_U16:
+ *param_type = DEVLINK_PARAM_TYPE_U16;
+ break;
+ case NLA_U32:
+ *param_type = DEVLINK_PARAM_TYPE_U32;
+ break;
+ case NLA_STRING:
+ *param_type = DEVLINK_PARAM_TYPE_STRING;
+ break;
+ case NLA_FLAG:
+ *param_type = DEVLINK_PARAM_TYPE_BOOL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int
+devlink_param_value_get_from_info(const struct devlink_param *param,
+ struct genl_info *info,
+ union devlink_param_value *value)
+{
+ struct nlattr *param_data;
+ int len;
+
+ param_data = info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA];
+
+ if (param->type != DEVLINK_PARAM_TYPE_BOOL && !param_data)
+ return -EINVAL;
+
+ switch (param->type) {
+ case DEVLINK_PARAM_TYPE_U8:
+ if (nla_len(param_data) != sizeof(u8))
+ return -EINVAL;
+ value->vu8 = nla_get_u8(param_data);
+ break;
+ case DEVLINK_PARAM_TYPE_U16:
+ if (nla_len(param_data) != sizeof(u16))
+ return -EINVAL;
+ value->vu16 = nla_get_u16(param_data);
+ break;
+ case DEVLINK_PARAM_TYPE_U32:
+ if (nla_len(param_data) != sizeof(u32))
+ return -EINVAL;
+ value->vu32 = nla_get_u32(param_data);
+ break;
+ case DEVLINK_PARAM_TYPE_STRING:
+ len = strnlen(nla_data(param_data), nla_len(param_data));
+ if (len == nla_len(param_data) ||
+ len >= __DEVLINK_PARAM_MAX_STRING_VALUE)
+ return -EINVAL;
+ strcpy(value->vstr, nla_data(param_data));
+ break;
+ case DEVLINK_PARAM_TYPE_BOOL:
+ if (param_data && nla_len(param_data))
+ return -EINVAL;
+ value->vbool = nla_get_flag(param_data);
+ break;
+ }
+ return 0;
+}
+
+static struct devlink_param_item *
+devlink_param_get_from_info(struct xarray *params, struct genl_info *info)
+{
+ char *param_name;
+
+ if (GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_PARAM_NAME))
+ return NULL;
+
+ param_name = nla_data(info->attrs[DEVLINK_ATTR_PARAM_NAME]);
+ return devlink_param_find_by_name(params, param_name);
+}
+
+int devlink_nl_param_get_doit(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct devlink *devlink = info->user_ptr[0];
+ struct devlink_param_item *param_item;
+ struct sk_buff *msg;
+ int err;
+
+ param_item = devlink_param_get_from_info(&devlink->params, info);
+ if (!param_item)
+ return -EINVAL;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ err = devlink_nl_param_fill(msg, devlink, 0, param_item,
+ DEVLINK_CMD_PARAM_GET,
+ info->snd_portid, info->snd_seq, 0);
+ if (err) {
+ nlmsg_free(msg);
+ return err;
+ }
+
+ return genlmsg_reply(msg, info);
+}
+
+static int __devlink_nl_cmd_param_set_doit(struct devlink *devlink,
+ unsigned int port_index,
+ struct xarray *params,
+ struct genl_info *info,
+ enum devlink_command cmd)
+{
+ enum devlink_param_type param_type;
+ struct devlink_param_gset_ctx ctx;
+ enum devlink_param_cmode cmode;
+ struct devlink_param_item *param_item;
+ const struct devlink_param *param;
+ union devlink_param_value value;
+ int err = 0;
+
+ param_item = devlink_param_get_from_info(params, info);
+ if (!param_item)
+ return -EINVAL;
+ param = param_item->param;
+ err = devlink_param_type_get_from_info(info, &param_type);
+ if (err)
+ return err;
+ if (param_type != param->type)
+ return -EINVAL;
+ err = devlink_param_value_get_from_info(param, info, &value);
+ if (err)
+ return err;
+ if (param->validate) {
+ err = param->validate(devlink, param->id, value, info->extack);
+ if (err)
+ return err;
+ }
+
+ if (GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_PARAM_VALUE_CMODE))
+ return -EINVAL;
+ cmode = nla_get_u8(info->attrs[DEVLINK_ATTR_PARAM_VALUE_CMODE]);
+ if (!devlink_param_cmode_is_supported(param, cmode))
+ return -EOPNOTSUPP;
+
+ if (cmode == DEVLINK_PARAM_CMODE_DRIVERINIT) {
+ param_item->driverinit_value_new = value;
+ param_item->driverinit_value_new_valid = true;
+ } else {
+ if (!param->set)
+ return -EOPNOTSUPP;
+ ctx.val = value;
+ ctx.cmode = cmode;
+ err = devlink_param_set(devlink, param, &ctx);
+ if (err)
+ return err;
+ }
+
+ devlink_param_notify(devlink, port_index, param_item, cmd);
+ return 0;
+}
+
+int devlink_nl_cmd_param_set_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ struct devlink *devlink = info->user_ptr[0];
+
+ return __devlink_nl_cmd_param_set_doit(devlink, 0, &devlink->params,
+ info, DEVLINK_CMD_PARAM_NEW);
+}
+
+int devlink_nl_cmd_port_param_get_dumpit(struct sk_buff *msg,
+ struct netlink_callback *cb)
+{
+ NL_SET_ERR_MSG(cb->extack, "Port params are not supported");
+ return msg->len;
+}
+
+int devlink_nl_cmd_port_param_get_doit(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ NL_SET_ERR_MSG(info->extack, "Port params are not supported");
+ return -EINVAL;
+}
+
+int devlink_nl_cmd_port_param_set_doit(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ NL_SET_ERR_MSG(info->extack, "Port params are not supported");
+ return -EINVAL;
+}
+
+static int devlink_param_verify(const struct devlink_param *param)
+{
+ if (!param || !param->name || !param->supported_cmodes)
+ return -EINVAL;
+ if (param->generic)
+ return devlink_param_generic_verify(param);
+ else
+ return devlink_param_driver_verify(param);
+}
+
+static int devlink_param_register(struct devlink *devlink,
+ const struct devlink_param *param)
+{
+ struct devlink_param_item *param_item;
+ int err;
+
+ WARN_ON(devlink_param_verify(param));
+ WARN_ON(devlink_param_find_by_name(&devlink->params, param->name));
+
+ if (param->supported_cmodes == BIT(DEVLINK_PARAM_CMODE_DRIVERINIT))
+ WARN_ON(param->get || param->set);
+ else
+ WARN_ON(!param->get || !param->set);
+
+ param_item = kzalloc(sizeof(*param_item), GFP_KERNEL);
+ if (!param_item)
+ return -ENOMEM;
+
+ param_item->param = param;
+
+ err = xa_insert(&devlink->params, param->id, param_item, GFP_KERNEL);
+ if (err)
+ goto err_xa_insert;
+
+ devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_NEW);
+ return 0;
+
+err_xa_insert:
+ kfree(param_item);
+ return err;
+}
+
+static void devlink_param_unregister(struct devlink *devlink,
+ const struct devlink_param *param)
+{
+ struct devlink_param_item *param_item;
+
+ param_item = devlink_param_find_by_id(&devlink->params, param->id);
+ if (WARN_ON(!param_item))
+ return;
+ devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_DEL);
+ xa_erase(&devlink->params, param->id);
+ kfree(param_item);
+}
+
+/**
+ * devl_params_register - register configuration parameters
+ *
+ * @devlink: devlink
+ * @params: configuration parameters array
+ * @params_count: number of parameters provided
+ *
+ * Register the configuration parameters supported by the driver.
+ */
+int devl_params_register(struct devlink *devlink,
+ const struct devlink_param *params,
+ size_t params_count)
+{
+ const struct devlink_param *param = params;
+ int i, err;
+
+ lockdep_assert_held(&devlink->lock);
+
+ for (i = 0; i < params_count; i++, param++) {
+ err = devlink_param_register(devlink, param);
+ if (err)
+ goto rollback;
+ }
+ return 0;
+
+rollback:
+ if (!i)
+ return err;
+
+ for (param--; i > 0; i--, param--)
+ devlink_param_unregister(devlink, param);
+ return err;
+}
+EXPORT_SYMBOL_GPL(devl_params_register);
+
+int devlink_params_register(struct devlink *devlink,
+ const struct devlink_param *params,
+ size_t params_count)
+{
+ int err;
+
+ devl_lock(devlink);
+ err = devl_params_register(devlink, params, params_count);
+ devl_unlock(devlink);
+ return err;
+}
+EXPORT_SYMBOL_GPL(devlink_params_register);
+
+/**
+ * devl_params_unregister - unregister configuration parameters
+ * @devlink: devlink
+ * @params: configuration parameters to unregister
+ * @params_count: number of parameters provided
+ */
+void devl_params_unregister(struct devlink *devlink,
+ const struct devlink_param *params,
+ size_t params_count)
+{
+ const struct devlink_param *param = params;
+ int i;
+
+ lockdep_assert_held(&devlink->lock);
+
+ for (i = 0; i < params_count; i++, param++)
+ devlink_param_unregister(devlink, param);
+}
+EXPORT_SYMBOL_GPL(devl_params_unregister);
+
+void devlink_params_unregister(struct devlink *devlink,
+ const struct devlink_param *params,
+ size_t params_count)
+{
+ devl_lock(devlink);
+ devl_params_unregister(devlink, params, params_count);
+ devl_unlock(devlink);
+}
+EXPORT_SYMBOL_GPL(devlink_params_unregister);
+
+/**
+ * devl_param_driverinit_value_get - get configuration parameter
+ * value for driver initializing
+ *
+ * @devlink: devlink
+ * @param_id: parameter ID
+ * @val: pointer to store the value of parameter in driverinit
+ * configuration mode
+ *
+ * This function should be used by the driver to get driverinit
+ * configuration for initialization after reload command.
+ *
+ * Note that lockless call of this function relies on the
+ * driver to maintain following basic sane behavior:
+ * 1) Driver ensures a call to this function cannot race with
+ * registering/unregistering the parameter with the same parameter ID.
+ * 2) Driver ensures a call to this function cannot race with
+ * devl_param_driverinit_value_set() call with the same parameter ID.
+ * 3) Driver ensures a call to this function cannot race with
+ * reload operation.
+ * If the driver is not able to comply, it has to take the devlink->lock
+ * while calling this.
+ */
+int devl_param_driverinit_value_get(struct devlink *devlink, u32 param_id,
+ union devlink_param_value *val)
+{
+ struct devlink_param_item *param_item;
+
+ if (WARN_ON(!devlink_reload_supported(devlink->ops)))
+ return -EOPNOTSUPP;
+
+ param_item = devlink_param_find_by_id(&devlink->params, param_id);
+ if (!param_item)
+ return -EINVAL;
+
+ if (!param_item->driverinit_value_valid)
+ return -EOPNOTSUPP;
+
+ if (WARN_ON(!devlink_param_cmode_is_supported(param_item->param,
+ DEVLINK_PARAM_CMODE_DRIVERINIT)))
+ return -EOPNOTSUPP;
+
+ *val = param_item->driverinit_value;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devl_param_driverinit_value_get);
+
+/**
+ * devl_param_driverinit_value_set - set value of configuration
+ * parameter for driverinit
+ * configuration mode
+ *
+ * @devlink: devlink
+ * @param_id: parameter ID
+ * @init_val: value of parameter to set for driverinit configuration mode
+ *
+ * This function should be used by the driver to set driverinit
+ * configuration mode default value.
+ */
+void devl_param_driverinit_value_set(struct devlink *devlink, u32 param_id,
+ union devlink_param_value init_val)
+{
+ struct devlink_param_item *param_item;
+
+ devl_assert_locked(devlink);
+
+ param_item = devlink_param_find_by_id(&devlink->params, param_id);
+ if (WARN_ON(!param_item))
+ return;
+
+ if (WARN_ON(!devlink_param_cmode_is_supported(param_item->param,
+ DEVLINK_PARAM_CMODE_DRIVERINIT)))
+ return;
+
+ param_item->driverinit_value = init_val;
+ param_item->driverinit_value_valid = true;
+
+ devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_NEW);
+}
+EXPORT_SYMBOL_GPL(devl_param_driverinit_value_set);
+
+void devlink_params_driverinit_load_new(struct devlink *devlink)
+{
+ struct devlink_param_item *param_item;
+ unsigned long param_id;
+
+ xa_for_each(&devlink->params, param_id, param_item) {
+ if (!devlink_param_cmode_is_supported(param_item->param,
+ DEVLINK_PARAM_CMODE_DRIVERINIT) ||
+ !param_item->driverinit_value_new_valid)
+ continue;
+ param_item->driverinit_value = param_item->driverinit_value_new;
+ param_item->driverinit_value_valid = true;
+ param_item->driverinit_value_new_valid = false;
+ }
+}
+
+/**
+ * devl_param_value_changed - notify devlink on a parameter's value
+ * change. Should be called by the driver
+ * right after the change.
+ *
+ * @devlink: devlink
+ * @param_id: parameter ID
+ *
+ * This function should be used by the driver to notify devlink on value
+ * change, excluding driverinit configuration mode.
+ * For driverinit configuration mode driver should use the function
+ */
+void devl_param_value_changed(struct devlink *devlink, u32 param_id)
+{
+ struct devlink_param_item *param_item;
+
+ param_item = devlink_param_find_by_id(&devlink->params, param_id);
+ WARN_ON(!param_item);
+
+ devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_NEW);
+}
+EXPORT_SYMBOL_GPL(devl_param_value_changed);
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-24 05:53:46 +0000