RE: [RFC PATCH V3 net-next 5/5] ethtool: Add fallback to get_module_eeprom from netlink command

From: Vladyslav Tarasiuk <redacted>

In case netlink get_module_eeprom_data_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 <redacted>
---
 net/ethtool/eeprom.c | 75
+++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 74 insertions(+), 1 deletion(-)

diff --git a/net/ethtool/eeprom.c b/net/ethtool/eeprom.c index

e110336dc231..33ba9ecc36cb 100644

--- a/net/ethtool/eeprom.c
+++ b/net/ethtool/eeprom.c

@@ -25,6 +25,79 @@ struct eeprom_data_reply_data {  #define

EEPROM_DATA_REPDATA(__reply_base) \
 	container_of(__reply_base, struct eeprom_data_reply_data, base)

+static int fallback_set_params(struct eeprom_data_req_info *request,
+			       struct ethtool_modinfo *modinfo,
+			       struct ethtool_eeprom *eeprom) {
+	u32 offset = request->offset;
+	u32 length = request->length;
+
+	if (request->page) {
+		if (offset < 128 || offset + length >
ETH_MODULE_EEPROM_PAGE_LEN)
+			return -EINVAL;
+		offset = request->page * 128 + offset;
+	}
+
+	if (modinfo->type == ETH_MODULE_SFF_8079 &&
+	    request->i2c_address == 0x51)
+		offset += ETH_MODULE_EEPROM_PAGE_LEN;
+
+	if (!length)
+		length = modinfo->eeprom_len;

+
+	if (offset >= modinfo->eeprom_len)
+		return -EINVAL;
+
+	if (modinfo->eeprom_len < offset + length)
+		length = modinfo->eeprom_len - offset;
+
+	eeprom->cmd = ETHTOOL_GMODULEEEPROM;
+	eeprom->len = length;
+	eeprom->offset = offset;
+
+	return 0;
+}
+
+static int eeprom_data_fallback(struct eeprom_data_req_info *request,
+				struct eeprom_data_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_data_prepare_data(const struct ethnl_req_info
*req_base,
 				    struct ethnl_reply_data *reply_base,
 				    struct genl_info *info)

@@ -36,7 +109,7 @@ static int eeprom_data_prepare_data(const struct

ethnl_req_info *req_base,
 	int ret;

 	if (!dev->ethtool_ops->get_module_eeprom_data_by_page)
-		return -EOPNOTSUPP;
+		return eeprom_data_fallback(request, reply, info);

 	page_data.offset = request->offset;
 	page_data.length = request->length;
--
2.26.2