1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include <linux/ethtool.h> 4 #include <linux/sfp.h> 5 #include "netlink.h" 6 #include "common.h" 7 8 struct eeprom_req_info { 9 struct ethnl_req_info base; 10 u32 offset; 11 u32 length; 12 u8 page; 13 u8 bank; 14 u8 i2c_address; 15 }; 16 17 struct eeprom_reply_data { 18 struct ethnl_reply_data base; 19 u32 length; 20 u8 *data; 21 }; 22 23 #define MODULE_EEPROM_REQINFO(__req_base) \ 24 container_of(__req_base, struct eeprom_req_info, base) 25 26 #define MODULE_EEPROM_REPDATA(__reply_base) \ 27 container_of(__reply_base, struct eeprom_reply_data, base) 28 29 static int fallback_set_params(struct eeprom_req_info *request, 30 struct ethtool_modinfo *modinfo, 31 struct ethtool_eeprom *eeprom) 32 { 33 u32 offset = request->offset; 34 u32 length = request->length; 35 36 if (request->page) 37 offset = request->page * ETH_MODULE_EEPROM_PAGE_LEN + offset; 38 39 if (modinfo->type == ETH_MODULE_SFF_8472 && 40 request->i2c_address == 0x51) 41 offset += ETH_MODULE_EEPROM_PAGE_LEN * 2; 42 43 if (offset >= modinfo->eeprom_len) 44 return -EINVAL; 45 46 eeprom->cmd = ETHTOOL_GMODULEEEPROM; 47 eeprom->len = length; 48 eeprom->offset = offset; 49 50 return 0; 51 } 52 53 static int eeprom_fallback(struct eeprom_req_info *request, 54 struct eeprom_reply_data *reply, 55 struct genl_info *info) 56 { 57 struct net_device *dev = reply->base.dev; 58 struct ethtool_modinfo modinfo = {0}; 59 struct ethtool_eeprom eeprom = {0}; 60 u8 *data; 61 int err; 62 63 modinfo.cmd = ETHTOOL_GMODULEINFO; 64 err = ethtool_get_module_info_call(dev, &modinfo); 65 if (err < 0) 66 return err; 67 68 err = fallback_set_params(request, &modinfo, &eeprom); 69 if (err < 0) 70 return err; 71 72 data = kmalloc(eeprom.len, GFP_KERNEL); 73 if (!data) 74 return -ENOMEM; 75 err = ethtool_get_module_eeprom_call(dev, &eeprom, data); 76 if (err < 0) 77 goto err_out; 78 79 reply->data = data; 80 reply->length = eeprom.len; 81 82 return 0; 83 84 err_out: 85 kfree(data); 86 return err; 87 } 88 89 static int get_module_eeprom_by_page(struct net_device *dev, 90 struct ethtool_module_eeprom *page_data, 91 struct netlink_ext_ack *extack) 92 { 93 const struct ethtool_ops *ops = dev->ethtool_ops; 94 95 if (dev->sfp_bus) 96 return sfp_get_module_eeprom_by_page(dev->sfp_bus, page_data, extack); 97 98 if (ops->get_module_eeprom_by_page) 99 return ops->get_module_eeprom_by_page(dev, page_data, extack); 100 101 return -EOPNOTSUPP; 102 } 103 104 static int eeprom_prepare_data(const struct ethnl_req_info *req_base, 105 struct ethnl_reply_data *reply_base, 106 struct genl_info *info) 107 { 108 struct eeprom_reply_data *reply = MODULE_EEPROM_REPDATA(reply_base); 109 struct eeprom_req_info *request = MODULE_EEPROM_REQINFO(req_base); 110 struct ethtool_module_eeprom page_data = {0}; 111 struct net_device *dev = reply_base->dev; 112 int ret; 113 114 page_data.offset = request->offset; 115 page_data.length = request->length; 116 page_data.i2c_address = request->i2c_address; 117 page_data.page = request->page; 118 page_data.bank = request->bank; 119 page_data.data = kmalloc(page_data.length, GFP_KERNEL); 120 if (!page_data.data) 121 return -ENOMEM; 122 123 ret = ethnl_ops_begin(dev); 124 if (ret) 125 goto err_free; 126 127 ret = get_module_eeprom_by_page(dev, &page_data, info->extack); 128 if (ret < 0) 129 goto err_ops; 130 131 reply->length = ret; 132 reply->data = page_data.data; 133 134 ethnl_ops_complete(dev); 135 return 0; 136 137 err_ops: 138 ethnl_ops_complete(dev); 139 err_free: 140 kfree(page_data.data); 141 142 if (ret == -EOPNOTSUPP) 143 return eeprom_fallback(request, reply, info); 144 return ret; 145 } 146 147 static int eeprom_parse_request(struct ethnl_req_info *req_info, struct nlattr **tb, 148 struct netlink_ext_ack *extack) 149 { 150 struct eeprom_req_info *request = MODULE_EEPROM_REQINFO(req_info); 151 152 if (!tb[ETHTOOL_A_MODULE_EEPROM_OFFSET] || 153 !tb[ETHTOOL_A_MODULE_EEPROM_LENGTH] || 154 !tb[ETHTOOL_A_MODULE_EEPROM_PAGE] || 155 !tb[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS]) 156 return -EINVAL; 157 158 request->i2c_address = nla_get_u8(tb[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS]); 159 request->offset = nla_get_u32(tb[ETHTOOL_A_MODULE_EEPROM_OFFSET]); 160 request->length = nla_get_u32(tb[ETHTOOL_A_MODULE_EEPROM_LENGTH]); 161 162 /* The following set of conditions limit the API to only dump 1/2 163 * EEPROM page without crossing low page boundary located at offset 128. 164 * This means user may only request dumps of length limited to 128 from 165 * either low 128 bytes or high 128 bytes. 166 * For pages higher than 0 only high 128 bytes are accessible. 167 */ 168 request->page = nla_get_u8(tb[ETHTOOL_A_MODULE_EEPROM_PAGE]); 169 if (request->page && request->offset < ETH_MODULE_EEPROM_PAGE_LEN) { 170 NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_MODULE_EEPROM_PAGE], 171 "reading from lower half page is allowed for page 0 only"); 172 return -EINVAL; 173 } 174 175 if (request->offset < ETH_MODULE_EEPROM_PAGE_LEN && 176 request->offset + request->length > ETH_MODULE_EEPROM_PAGE_LEN) { 177 NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_MODULE_EEPROM_LENGTH], 178 "reading cross half page boundary is illegal"); 179 return -EINVAL; 180 } else if (request->offset + request->length > ETH_MODULE_EEPROM_PAGE_LEN * 2) { 181 NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_MODULE_EEPROM_LENGTH], 182 "reading cross page boundary is illegal"); 183 return -EINVAL; 184 } 185 186 if (tb[ETHTOOL_A_MODULE_EEPROM_BANK]) 187 request->bank = nla_get_u8(tb[ETHTOOL_A_MODULE_EEPROM_BANK]); 188 189 return 0; 190 } 191 192 static int eeprom_reply_size(const struct ethnl_req_info *req_base, 193 const struct ethnl_reply_data *reply_base) 194 { 195 const struct eeprom_req_info *request = MODULE_EEPROM_REQINFO(req_base); 196 197 return nla_total_size(sizeof(u8) * request->length); /* _EEPROM_DATA */ 198 } 199 200 static int eeprom_fill_reply(struct sk_buff *skb, 201 const struct ethnl_req_info *req_base, 202 const struct ethnl_reply_data *reply_base) 203 { 204 struct eeprom_reply_data *reply = MODULE_EEPROM_REPDATA(reply_base); 205 206 return nla_put(skb, ETHTOOL_A_MODULE_EEPROM_DATA, reply->length, reply->data); 207 } 208 209 static void eeprom_cleanup_data(struct ethnl_reply_data *reply_base) 210 { 211 struct eeprom_reply_data *reply = MODULE_EEPROM_REPDATA(reply_base); 212 213 kfree(reply->data); 214 } 215 216 const struct ethnl_request_ops ethnl_module_eeprom_request_ops = { 217 .request_cmd = ETHTOOL_MSG_MODULE_EEPROM_GET, 218 .reply_cmd = ETHTOOL_MSG_MODULE_EEPROM_GET_REPLY, 219 .hdr_attr = ETHTOOL_A_MODULE_EEPROM_HEADER, 220 .req_info_size = sizeof(struct eeprom_req_info), 221 .reply_data_size = sizeof(struct eeprom_reply_data), 222 223 .parse_request = eeprom_parse_request, 224 .prepare_data = eeprom_prepare_data, 225 .reply_size = eeprom_reply_size, 226 .fill_reply = eeprom_fill_reply, 227 .cleanup_data = eeprom_cleanup_data, 228 }; 229 230 const struct nla_policy ethnl_module_eeprom_get_policy[] = { 231 [ETHTOOL_A_MODULE_EEPROM_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy), 232 [ETHTOOL_A_MODULE_EEPROM_OFFSET] = 233 NLA_POLICY_MAX(NLA_U32, ETH_MODULE_EEPROM_PAGE_LEN * 2 - 1), 234 [ETHTOOL_A_MODULE_EEPROM_LENGTH] = 235 NLA_POLICY_RANGE(NLA_U32, 1, ETH_MODULE_EEPROM_PAGE_LEN), 236 [ETHTOOL_A_MODULE_EEPROM_PAGE] = { .type = NLA_U8 }, 237 [ETHTOOL_A_MODULE_EEPROM_BANK] = { .type = NLA_U8 }, 238 [ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS] = 239 NLA_POLICY_RANGE(NLA_U8, 0, ETH_MODULE_MAX_I2C_ADDRESS), 240 }; 241 242