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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/ethtool.h>
#include <linux/sfp.h>
#include "netlink.h"
#include "common.h"
struct eeprom_req_info {
struct ethnl_req_info base;
u32 offset;
u32 length;
u8 page;
u8 bank;
u8 i2c_address;
};
struct eeprom_reply_data {
struct ethnl_reply_data base;
u32 length;
u8 *data;
};
#define MODULE_EEPROM_REQINFO(__req_base) \
container_of(__req_base, struct eeprom_req_info, base)
#define MODULE_EEPROM_REPDATA(__reply_base) \
container_of(__reply_base, struct eeprom_reply_data, base)
static int fallback_set_params(struct eeprom_req_info *request,
struct ethtool_modinfo *modinfo,
struct ethtool_eeprom *eeprom)
{
u32 offset = request->offset;
u32 length = request->length;
if (request->page)
offset = request->page * ETH_MODULE_EEPROM_PAGE_LEN + offset;
if (modinfo->type == ETH_MODULE_SFF_8472 &&
request->i2c_address == 0x51)
offset += ETH_MODULE_EEPROM_PAGE_LEN * 2;
if (offset >= modinfo->eeprom_len)
return -EINVAL;
eeprom->cmd = ETHTOOL_GMODULEEEPROM;
eeprom->len = length;
eeprom->offset = offset;
return 0;
}
static int eeprom_fallback(struct eeprom_req_info *request,
struct eeprom_reply_data *reply)
{
struct net_device *dev = reply->base.dev;
struct ethtool_modinfo modinfo = {0};
struct ethtool_eeprom eeprom = {0};
u8 *data;
int err;
modinfo.cmd = ETHTOOL_GMODULEINFO;
err = ethtool_get_module_info_call(dev, &modinfo);
if (err < 0)
return err;
err = fallback_set_params(request, &modinfo, &eeprom);
if (err < 0)
return err;
data = kmalloc(eeprom.len, GFP_KERNEL);
if (!data)
return -ENOMEM;
err = ethtool_get_module_eeprom_call(dev, &eeprom, data);
if (err < 0)
goto err_out;
reply->data = data;
reply->length = eeprom.len;
return 0;
err_out:
kfree(data);
return err;
}
static int get_module_eeprom_by_page(struct net_device *dev,
struct ethtool_module_eeprom *page_data,
struct netlink_ext_ack *extack)
{
const struct ethtool_ops *ops = dev->ethtool_ops;
if (dev->sfp_bus)
return sfp_get_module_eeprom_by_page(dev->sfp_bus, page_data, extack);
if (ops->get_module_eeprom_by_page)
return ops->get_module_eeprom_by_page(dev, page_data, extack);
return -EOPNOTSUPP;
}
static int eeprom_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
const struct genl_info *info)
{
struct eeprom_reply_data *reply = MODULE_EEPROM_REPDATA(reply_base);
struct eeprom_req_info *request = MODULE_EEPROM_REQINFO(req_base);
struct ethtool_module_eeprom page_data = {0};
struct net_device *dev = reply_base->dev;
int ret;
page_data.offset = request->offset;
page_data.length = request->length;
page_data.i2c_address = request->i2c_address;
page_data.page = request->page;
page_data.bank = request->bank;
page_data.data = kmalloc(page_data.length, GFP_KERNEL);
if (!page_data.data)
return -ENOMEM;
ret = ethnl_ops_begin(dev);
if (ret)
goto err_free;
ret = get_module_eeprom_by_page(dev, &page_data, info->extack);
if (ret < 0)
goto err_ops;
reply->length = ret;
reply->data = page_data.data;
ethnl_ops_complete(dev);
return 0;
err_ops:
ethnl_ops_complete(dev);
err_free:
kfree(page_data.data);
if (ret == -EOPNOTSUPP)
return eeprom_fallback(request, reply);
return ret;
}
static int eeprom_parse_request(struct ethnl_req_info *req_info, struct nlattr **tb,
struct netlink_ext_ack *extack)
{
struct eeprom_req_info *request = MODULE_EEPROM_REQINFO(req_info);
if (!tb[ETHTOOL_A_MODULE_EEPROM_OFFSET] ||
!tb[ETHTOOL_A_MODULE_EEPROM_LENGTH] ||
!tb[ETHTOOL_A_MODULE_EEPROM_PAGE] ||
!tb[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS])
return -EINVAL;
request->i2c_address = nla_get_u8(tb[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS]);
request->offset = nla_get_u32(tb[ETHTOOL_A_MODULE_EEPROM_OFFSET]);
request->length = nla_get_u32(tb[ETHTOOL_A_MODULE_EEPROM_LENGTH]);
/* The following set of conditions limit the API to only dump 1/2
* EEPROM page without crossing low page boundary located at offset 128.
* This means user may only request dumps of length limited to 128 from
* either low 128 bytes or high 128 bytes.
* For pages higher than 0 only high 128 bytes are accessible.
*/
request->page = nla_get_u8(tb[ETHTOOL_A_MODULE_EEPROM_PAGE]);
if (request->page && request->offset < ETH_MODULE_EEPROM_PAGE_LEN) {
NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_MODULE_EEPROM_PAGE],
"reading from lower half page is allowed for page 0 only");
return -EINVAL;
}
if (request->offset < ETH_MODULE_EEPROM_PAGE_LEN &&
request->offset + request->length > ETH_MODULE_EEPROM_PAGE_LEN) {
NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_MODULE_EEPROM_LENGTH],
"reading cross half page boundary is illegal");
return -EINVAL;
} else if (request->offset + request->length > ETH_MODULE_EEPROM_PAGE_LEN * 2) {
NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_MODULE_EEPROM_LENGTH],
"reading cross page boundary is illegal");
return -EINVAL;
}
if (tb[ETHTOOL_A_MODULE_EEPROM_BANK])
request->bank = nla_get_u8(tb[ETHTOOL_A_MODULE_EEPROM_BANK]);
return 0;
}
static int eeprom_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct eeprom_req_info *request = MODULE_EEPROM_REQINFO(req_base);
return nla_total_size(sizeof(u8) * request->length); /* _EEPROM_DATA */
}
static int eeprom_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
struct eeprom_reply_data *reply = MODULE_EEPROM_REPDATA(reply_base);
return nla_put(skb, ETHTOOL_A_MODULE_EEPROM_DATA, reply->length, reply->data);
}
static void eeprom_cleanup_data(struct ethnl_reply_data *reply_base)
{
struct eeprom_reply_data *reply = MODULE_EEPROM_REPDATA(reply_base);
kfree(reply->data);
}
const struct ethnl_request_ops ethnl_module_eeprom_request_ops = {
.request_cmd = ETHTOOL_MSG_MODULE_EEPROM_GET,
.reply_cmd = ETHTOOL_MSG_MODULE_EEPROM_GET_REPLY,
.hdr_attr = ETHTOOL_A_MODULE_EEPROM_HEADER,
.req_info_size = sizeof(struct eeprom_req_info),
.reply_data_size = sizeof(struct eeprom_reply_data),
.parse_request = eeprom_parse_request,
.prepare_data = eeprom_prepare_data,
.reply_size = eeprom_reply_size,
.fill_reply = eeprom_fill_reply,
.cleanup_data = eeprom_cleanup_data,
};
const struct nla_policy ethnl_module_eeprom_get_policy[] = {
[ETHTOOL_A_MODULE_EEPROM_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
[ETHTOOL_A_MODULE_EEPROM_OFFSET] =
NLA_POLICY_MAX(NLA_U32, ETH_MODULE_EEPROM_PAGE_LEN * 2 - 1),
[ETHTOOL_A_MODULE_EEPROM_LENGTH] =
NLA_POLICY_RANGE(NLA_U32, 1, ETH_MODULE_EEPROM_PAGE_LEN),
[ETHTOOL_A_MODULE_EEPROM_PAGE] = { .type = NLA_U8 },
[ETHTOOL_A_MODULE_EEPROM_BANK] = { .type = NLA_U8 },
[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS] =
NLA_POLICY_RANGE(NLA_U8, 0, ETH_MODULE_MAX_I2C_ADDRESS),
};
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