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ethtool: Add fallback to get_module_eeprom from netlink command 

In case netlink get_module_eeprom_by_page() callback is not implemented
by the driver, try to call old get_module_info() and get_module_eeprom()
pair. Recalculate parameters to get_module_eeprom() offset and len using
page number and their sizes. Return error if this can't be done.

Signed-off-by: Vladyslav Tarasiuk <vladyslavt@nvidia.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladyslav Tarasiuk 2021-04-09 11:06:39 +03:00 committed by David S. Miller
parent 95dfc7effd
commit 96d971e307
1 changed files with 61 additions and 1 deletions
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62
net/ethtool/eeprom.c
View File

@ -25,6 +25,66 @@ struct eeprom_reply_data {
#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_8079 &&
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 genl_info *info)
{
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 eeprom_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
struct genl_info *info)
@ -36,7 +96,7 @@ static int eeprom_prepare_data(const struct ethnl_req_info *req_base,
int ret;
if (!dev->ethtool_ops->get_module_eeprom_by_page)
return -EOPNOTSUPP;
return eeprom_fallback(request, reply, info);
page_data.offset = request->offset;
page_data.length = request->length;