242 строки
6.8 KiB
C
242 строки
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/ethtool.h>
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#include <linux/sfp.h>
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#include "netlink.h"
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#include "common.h"
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struct eeprom_req_info {
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struct ethnl_req_info base;
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u32 offset;
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u32 length;
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u8 page;
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u8 bank;
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u8 i2c_address;
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};
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struct eeprom_reply_data {
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struct ethnl_reply_data base;
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u32 length;
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u8 *data;
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};
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#define MODULE_EEPROM_REQINFO(__req_base) \
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container_of(__req_base, struct eeprom_req_info, base)
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#define MODULE_EEPROM_REPDATA(__reply_base) \
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container_of(__reply_base, struct eeprom_reply_data, base)
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static int fallback_set_params(struct eeprom_req_info *request,
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struct ethtool_modinfo *modinfo,
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struct ethtool_eeprom *eeprom)
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{
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u32 offset = request->offset;
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u32 length = request->length;
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if (request->page)
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offset = request->page * ETH_MODULE_EEPROM_PAGE_LEN + offset;
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if (modinfo->type == ETH_MODULE_SFF_8079 &&
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request->i2c_address == 0x51)
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offset += ETH_MODULE_EEPROM_PAGE_LEN * 2;
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if (offset >= modinfo->eeprom_len)
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return -EINVAL;
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eeprom->cmd = ETHTOOL_GMODULEEEPROM;
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eeprom->len = length;
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eeprom->offset = offset;
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return 0;
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}
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static int eeprom_fallback(struct eeprom_req_info *request,
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struct eeprom_reply_data *reply,
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struct genl_info *info)
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{
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struct net_device *dev = reply->base.dev;
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struct ethtool_modinfo modinfo = {0};
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struct ethtool_eeprom eeprom = {0};
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u8 *data;
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int err;
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modinfo.cmd = ETHTOOL_GMODULEINFO;
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err = ethtool_get_module_info_call(dev, &modinfo);
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if (err < 0)
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return err;
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err = fallback_set_params(request, &modinfo, &eeprom);
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if (err < 0)
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return err;
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data = kmalloc(eeprom.len, GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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err = ethtool_get_module_eeprom_call(dev, &eeprom, data);
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if (err < 0)
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goto err_out;
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reply->data = data;
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reply->length = eeprom.len;
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return 0;
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err_out:
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kfree(data);
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return err;
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}
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static int get_module_eeprom_by_page(struct net_device *dev,
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struct ethtool_module_eeprom *page_data,
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struct netlink_ext_ack *extack)
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{
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const struct ethtool_ops *ops = dev->ethtool_ops;
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if (dev->sfp_bus)
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return sfp_get_module_eeprom_by_page(dev->sfp_bus, page_data, extack);
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if (ops->get_module_eeprom_by_page)
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return ops->get_module_eeprom_by_page(dev, page_data, extack);
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return -EOPNOTSUPP;
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}
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static int eeprom_prepare_data(const struct ethnl_req_info *req_base,
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struct ethnl_reply_data *reply_base,
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struct genl_info *info)
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{
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struct eeprom_reply_data *reply = MODULE_EEPROM_REPDATA(reply_base);
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struct eeprom_req_info *request = MODULE_EEPROM_REQINFO(req_base);
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struct ethtool_module_eeprom page_data = {0};
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struct net_device *dev = reply_base->dev;
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int ret;
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page_data.offset = request->offset;
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page_data.length = request->length;
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page_data.i2c_address = request->i2c_address;
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page_data.page = request->page;
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page_data.bank = request->bank;
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page_data.data = kmalloc(page_data.length, GFP_KERNEL);
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if (!page_data.data)
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return -ENOMEM;
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ret = ethnl_ops_begin(dev);
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if (ret)
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goto err_free;
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ret = get_module_eeprom_by_page(dev, &page_data, info->extack);
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if (ret < 0)
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goto err_ops;
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reply->length = ret;
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reply->data = page_data.data;
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ethnl_ops_complete(dev);
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return 0;
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err_ops:
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ethnl_ops_complete(dev);
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err_free:
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kfree(page_data.data);
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if (ret == -EOPNOTSUPP)
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return eeprom_fallback(request, reply, info);
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return ret;
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}
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static int eeprom_parse_request(struct ethnl_req_info *req_info, struct nlattr **tb,
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struct netlink_ext_ack *extack)
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{
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struct eeprom_req_info *request = MODULE_EEPROM_REQINFO(req_info);
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if (!tb[ETHTOOL_A_MODULE_EEPROM_OFFSET] ||
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!tb[ETHTOOL_A_MODULE_EEPROM_LENGTH] ||
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!tb[ETHTOOL_A_MODULE_EEPROM_PAGE] ||
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!tb[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS])
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return -EINVAL;
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request->i2c_address = nla_get_u8(tb[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS]);
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request->offset = nla_get_u32(tb[ETHTOOL_A_MODULE_EEPROM_OFFSET]);
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request->length = nla_get_u32(tb[ETHTOOL_A_MODULE_EEPROM_LENGTH]);
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/* The following set of conditions limit the API to only dump 1/2
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* EEPROM page without crossing low page boundary located at offset 128.
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* This means user may only request dumps of length limited to 128 from
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* either low 128 bytes or high 128 bytes.
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* For pages higher than 0 only high 128 bytes are accessible.
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*/
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request->page = nla_get_u8(tb[ETHTOOL_A_MODULE_EEPROM_PAGE]);
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if (request->page && request->offset < ETH_MODULE_EEPROM_PAGE_LEN) {
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NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_MODULE_EEPROM_PAGE],
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"reading from lower half page is allowed for page 0 only");
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return -EINVAL;
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}
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if (request->offset < ETH_MODULE_EEPROM_PAGE_LEN &&
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request->offset + request->length > ETH_MODULE_EEPROM_PAGE_LEN) {
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NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_MODULE_EEPROM_LENGTH],
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"reading cross half page boundary is illegal");
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return -EINVAL;
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} else if (request->offset + request->length > ETH_MODULE_EEPROM_PAGE_LEN * 2) {
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NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_MODULE_EEPROM_LENGTH],
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"reading cross page boundary is illegal");
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return -EINVAL;
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}
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if (tb[ETHTOOL_A_MODULE_EEPROM_BANK])
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request->bank = nla_get_u8(tb[ETHTOOL_A_MODULE_EEPROM_BANK]);
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return 0;
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}
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static int eeprom_reply_size(const struct ethnl_req_info *req_base,
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const struct ethnl_reply_data *reply_base)
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{
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const struct eeprom_req_info *request = MODULE_EEPROM_REQINFO(req_base);
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return nla_total_size(sizeof(u8) * request->length); /* _EEPROM_DATA */
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}
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static int eeprom_fill_reply(struct sk_buff *skb,
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const struct ethnl_req_info *req_base,
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const struct ethnl_reply_data *reply_base)
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{
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struct eeprom_reply_data *reply = MODULE_EEPROM_REPDATA(reply_base);
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return nla_put(skb, ETHTOOL_A_MODULE_EEPROM_DATA, reply->length, reply->data);
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}
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static void eeprom_cleanup_data(struct ethnl_reply_data *reply_base)
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{
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struct eeprom_reply_data *reply = MODULE_EEPROM_REPDATA(reply_base);
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kfree(reply->data);
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}
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const struct ethnl_request_ops ethnl_module_eeprom_request_ops = {
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.request_cmd = ETHTOOL_MSG_MODULE_EEPROM_GET,
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.reply_cmd = ETHTOOL_MSG_MODULE_EEPROM_GET_REPLY,
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.hdr_attr = ETHTOOL_A_MODULE_EEPROM_HEADER,
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.req_info_size = sizeof(struct eeprom_req_info),
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.reply_data_size = sizeof(struct eeprom_reply_data),
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.parse_request = eeprom_parse_request,
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.prepare_data = eeprom_prepare_data,
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.reply_size = eeprom_reply_size,
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.fill_reply = eeprom_fill_reply,
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.cleanup_data = eeprom_cleanup_data,
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};
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const struct nla_policy ethnl_module_eeprom_get_policy[] = {
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[ETHTOOL_A_MODULE_EEPROM_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
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[ETHTOOL_A_MODULE_EEPROM_OFFSET] =
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NLA_POLICY_MAX(NLA_U32, ETH_MODULE_EEPROM_PAGE_LEN * 2 - 1),
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[ETHTOOL_A_MODULE_EEPROM_LENGTH] =
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NLA_POLICY_RANGE(NLA_U32, 1, ETH_MODULE_EEPROM_PAGE_LEN),
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[ETHTOOL_A_MODULE_EEPROM_PAGE] = { .type = NLA_U8 },
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[ETHTOOL_A_MODULE_EEPROM_BANK] = { .type = NLA_U8 },
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[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS] =
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NLA_POLICY_RANGE(NLA_U8, 0, ETH_MODULE_MAX_I2C_ADDRESS),
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};
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