1 // SPDX-License-Identifier: GPL-2.0-only 2 // 3 // ethtool interface for Ethernet PSE (Power Sourcing Equipment) 4 // and PD (Powered Device) 5 // 6 // Copyright (c) 2022 Pengutronix, Oleksij Rempel <kernel@pengutronix.de> 7 // 8 9 #include "common.h" 10 #include "linux/pse-pd/pse.h" 11 #include "netlink.h" 12 #include <linux/ethtool_netlink.h> 13 #include <linux/ethtool.h> 14 #include <linux/phy.h> 15 16 struct pse_req_info { 17 struct ethnl_req_info base; 18 }; 19 20 struct pse_reply_data { 21 struct ethnl_reply_data base; 22 struct pse_control_status status; 23 }; 24 25 #define PSE_REPDATA(__reply_base) \ 26 container_of(__reply_base, struct pse_reply_data, base) 27 28 /* PSE_GET */ 29 30 const struct nla_policy ethnl_pse_get_policy[ETHTOOL_A_PSE_HEADER + 1] = { 31 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy), 32 }; 33 34 static int pse_get_pse_attributes(struct net_device *dev, 35 struct netlink_ext_ack *extack, 36 struct pse_reply_data *data) 37 { 38 struct phy_device *phydev = dev->phydev; 39 40 if (!phydev) { 41 NL_SET_ERR_MSG(extack, "No PHY is attached"); 42 return -EOPNOTSUPP; 43 } 44 45 if (!phydev->psec) { 46 NL_SET_ERR_MSG(extack, "No PSE is attached"); 47 return -EOPNOTSUPP; 48 } 49 50 memset(&data->status, 0, sizeof(data->status)); 51 52 return pse_ethtool_get_status(phydev->psec, extack, &data->status); 53 } 54 55 static int pse_prepare_data(const struct ethnl_req_info *req_base, 56 struct ethnl_reply_data *reply_base, 57 struct genl_info *info) 58 { 59 struct pse_reply_data *data = PSE_REPDATA(reply_base); 60 struct net_device *dev = reply_base->dev; 61 int ret; 62 63 ret = ethnl_ops_begin(dev); 64 if (ret < 0) 65 return ret; 66 67 ret = pse_get_pse_attributes(dev, info ? info->extack : NULL, data); 68 69 ethnl_ops_complete(dev); 70 71 return ret; 72 } 73 74 static int pse_reply_size(const struct ethnl_req_info *req_base, 75 const struct ethnl_reply_data *reply_base) 76 { 77 const struct pse_reply_data *data = PSE_REPDATA(reply_base); 78 const struct pse_control_status *st = &data->status; 79 int len = 0; 80 81 if (st->podl_admin_state > 0) 82 len += nla_total_size(sizeof(u32)); /* _PODL_PSE_ADMIN_STATE */ 83 if (st->podl_pw_status > 0) 84 len += nla_total_size(sizeof(u32)); /* _PODL_PSE_PW_D_STATUS */ 85 86 return len; 87 } 88 89 static int pse_fill_reply(struct sk_buff *skb, 90 const struct ethnl_req_info *req_base, 91 const struct ethnl_reply_data *reply_base) 92 { 93 const struct pse_reply_data *data = PSE_REPDATA(reply_base); 94 const struct pse_control_status *st = &data->status; 95 96 if (st->podl_admin_state > 0 && 97 nla_put_u32(skb, ETHTOOL_A_PODL_PSE_ADMIN_STATE, 98 st->podl_admin_state)) 99 return -EMSGSIZE; 100 101 if (st->podl_pw_status > 0 && 102 nla_put_u32(skb, ETHTOOL_A_PODL_PSE_PW_D_STATUS, 103 st->podl_pw_status)) 104 return -EMSGSIZE; 105 106 return 0; 107 } 108 109 /* PSE_SET */ 110 111 const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = { 112 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy), 113 [ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] = 114 NLA_POLICY_RANGE(NLA_U32, ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED, 115 ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED), 116 }; 117 118 static int 119 ethnl_set_pse_validate(struct ethnl_req_info *req_info, struct genl_info *info) 120 { 121 return !!info->attrs[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]; 122 } 123 124 static int 125 ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info) 126 { 127 struct net_device *dev = req_info->dev; 128 struct pse_control_config config = {}; 129 struct nlattr **tb = info->attrs; 130 struct phy_device *phydev; 131 132 /* this values are already validated by the ethnl_pse_set_policy */ 133 config.admin_cotrol = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]); 134 135 phydev = dev->phydev; 136 if (!phydev) { 137 NL_SET_ERR_MSG(info->extack, "No PHY is attached"); 138 return -EOPNOTSUPP; 139 } 140 141 if (!phydev->psec) { 142 NL_SET_ERR_MSG(info->extack, "No PSE is attached"); 143 return -EOPNOTSUPP; 144 } 145 146 /* Return errno directly - PSE has no notification */ 147 return pse_ethtool_set_config(phydev->psec, info->extack, &config); 148 } 149 150 const struct ethnl_request_ops ethnl_pse_request_ops = { 151 .request_cmd = ETHTOOL_MSG_PSE_GET, 152 .reply_cmd = ETHTOOL_MSG_PSE_GET_REPLY, 153 .hdr_attr = ETHTOOL_A_PSE_HEADER, 154 .req_info_size = sizeof(struct pse_req_info), 155 .reply_data_size = sizeof(struct pse_reply_data), 156 157 .prepare_data = pse_prepare_data, 158 .reply_size = pse_reply_size, 159 .fill_reply = pse_fill_reply, 160 161 .set_validate = ethnl_set_pse_validate, 162 .set = ethnl_set_pse, 163 /* PSE has no notification */ 164 }; 165