netdev - Re: [RFC PATCH V5 net-next 5/5] ethtool: Add fallback to get_module

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Date:   Fri, 26 Mar 2021 15:40:47 +0300
From:   Moshe Shemesh <moshe@...dia.com>
To:     Don Bollinger <don@...bollingers.org>,
        "'David S. Miller'" <davem@...emloft.net>,
        'Jakub Kicinski' <kuba@...nel.org>,
        'Andrew Lunn' <andrew@...n.ch>,
        'Adrian Pop' <pop.adrian61@...il.com>,
        'Michal Kubecek' <mkubecek@...e.cz>, <netdev@...r.kernel.org>
CC:     'Vladyslav Tarasiuk' <vladyslavt@...dia.com>
Subject: Re: [RFC PATCH V5 net-next 5/5] ethtool: Add fallback to
 get_module_eeprom from netlink command


On 3/25/2021 8:13 PM, Don Bollinger wrote:
>> From: Vladyslav Tarasiuk <vladyslavt@...dia.com>
>>
>> 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@...dia.com>
>> ---
>>   net/ethtool/eeprom.c | 66
>> +++++++++++++++++++++++++++++++++++++++++++-
>>   1 file changed, 65 insertions(+), 1 deletion(-)
>>
>> diff --git a/net/ethtool/eeprom.c b/net/ethtool/eeprom.c index
>> 10d5f6b34f2f..9f773b778bbe 100644
>> --- a/net/ethtool/eeprom.c
>> +++ b/net/ethtool/eeprom.c
>> @@ -25,6 +25,70 @@ 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;
> The test 'if (request->page)' is not necessary, the math works with page 0
> as well.  Keep it if you like the style.
OK.
>> +
>> +     if (modinfo->type == ETH_MODULE_SFF_8079 &&
>> +         request->i2c_address == 0x51)
>> +             offset += ETH_MODULE_EEPROM_PAGE_LEN;
> offset += ETH_MODULE_EEPROM_PAGE_LEN * 2;
>
> Now that PAGE_LEN is 128, you need two of them to account for both low
> memory and high memory at 0x50.


Right, thanks.

>> +
>> +     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;
>> +
>> +     if (!dev->ethtool_ops->get_module_info ||
>> +         !dev->ethtool_ops->get_module_eeprom || request->bank) {
>> +             return -EOPNOTSUPP;
>> +     }
>> +     modinfo.cmd = ETHTOOL_GMODULEINFO;
>> +     err = dev->ethtool_ops->get_module_info(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 = dev->ethtool_ops->get_module_eeprom(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 +100,7 @@ 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;
>> --
>> 2.18.2