1 // SPDX-License-Identifier: GPL-2.0-only 2 // 3 // ethtool interface for 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 const struct ethnl_request_ops ethnl_pse_request_ops = { 110 .request_cmd = ETHTOOL_MSG_PSE_GET, 111 .reply_cmd = ETHTOOL_MSG_PSE_GET_REPLY, 112 .hdr_attr = ETHTOOL_A_PSE_HEADER, 113 .req_info_size = sizeof(struct pse_req_info), 114 .reply_data_size = sizeof(struct pse_reply_data), 115 116 .prepare_data = pse_prepare_data, 117 .reply_size = pse_reply_size, 118 .fill_reply = pse_fill_reply, 119 }; 120 121 /* PSE_SET */ 122 123 const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = { 124 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy), 125 [ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] = 126 NLA_POLICY_RANGE(NLA_U32, ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED, 127 ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED), 128 }; 129 130 static int pse_set_pse_config(struct net_device *dev, 131 struct netlink_ext_ack *extack, 132 struct nlattr **tb) 133 { 134 struct phy_device *phydev = dev->phydev; 135 struct pse_control_config config = {}; 136 137 /* Optional attribute. Do not return error if not set. */ 138 if (!tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]) 139 return 0; 140 141 /* this values are already validated by the ethnl_pse_set_policy */ 142 config.admin_cotrol = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]); 143 144 if (!phydev) { 145 NL_SET_ERR_MSG(extack, "No PHY is attached"); 146 return -EOPNOTSUPP; 147 } 148 149 if (!phydev->psec) { 150 NL_SET_ERR_MSG(extack, "No PSE is attached"); 151 return -EOPNOTSUPP; 152 } 153 154 return pse_ethtool_set_config(phydev->psec, extack, &config); 155 } 156 157 int ethnl_set_pse(struct sk_buff *skb, struct genl_info *info) 158 { 159 struct ethnl_req_info req_info = {}; 160 struct nlattr **tb = info->attrs; 161 struct net_device *dev; 162 int ret; 163 164 ret = ethnl_parse_header_dev_get(&req_info, tb[ETHTOOL_A_PSE_HEADER], 165 genl_info_net(info), info->extack, 166 true); 167 if (ret < 0) 168 return ret; 169 170 dev = req_info.dev; 171 172 rtnl_lock(); 173 ret = ethnl_ops_begin(dev); 174 if (ret < 0) 175 goto out_rtnl; 176 177 ret = pse_set_pse_config(dev, info->extack, tb); 178 ethnl_ops_complete(dev); 179 out_rtnl: 180 rtnl_unlock(); 181 182 ethnl_parse_header_dev_put(&req_info); 183 184 return ret; 185 } 186