netdev - Re: [RFC PATCH net-next 9/9] ethtool: Add ability to flash transceiver modules' firmware

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Message-ID: <20240124090620.69af41a6@kernel.org>
Date: Wed, 24 Jan 2024 09:06:20 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Danielle Ratson <danieller@...dia.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "davem@...emloft.net"
 <davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>,
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 <sdf@...gle.com>, "kory.maincent@...tlin.com" <kory.maincent@...tlin.com>,
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 <jiri@...nulli.us>, "linux-doc@...r.kernel.org"
 <linux-doc@...r.kernel.org>, "linux-kernel@...r.kernel.org"
 <linux-kernel@...r.kernel.org>, mlxsw <mlxsw@...dia.com>, Petr Machata
 <petrm@...dia.com>, Ido Schimmel <idosch@...dia.com>
Subject: Re: [RFC PATCH net-next 9/9] ethtool: Add ability to flash
 transceiver modules' firmware

On Wed, 24 Jan 2024 15:46:55 +0000 Danielle Ratson wrote:
> > > The file_name parameter is not really needed inside the work. Once we
> > > called request_firmware_direct(), we have all that we need in
> > > module_fw->fw. Do we still need to avoid that situation? If so, can
> > > you please suggest how?  
> > 
> > I'd pass it to module_flash_fw_schedule() as a separate argument, if it doesn't
> > have to be saved.  
> 
> It doesn’t make the module_fw->file_name attribute redundant?

This is what I mean:

diff --git a/net/ethtool/module.c b/net/ethtool/module.c
index 69cedb3ede6d..ea048a7089d9 100644
--- a/net/ethtool/module.c
+++ b/net/ethtool/module.c
@@ -229,7 +229,7 @@ static int module_flash_fw_work_init(struct ethtool_module_fw_flash *module_fw,
 }
 
 static int
-module_flash_fw_schedule(struct net_device *dev,
+module_flash_fw_schedule(struct net_device *dev, const char *file_name,
 			 struct ethtool_module_fw_flash_params *params,
 			 struct netlink_ext_ack *extack)
 {
@@ -254,8 +254,7 @@ module_flash_fw_schedule(struct net_device *dev,
 		return -ENOMEM;
 
 	module_fw->params = *params;
-	err = request_firmware(&module_fw->fw, module_fw->params.file_name,
-			       &dev->dev);
+	err = request_firmware(&module_fw->fw, file_name, &dev->dev);
 	if (err) {
 		NL_SET_ERR_MSG(extack,
 			       "Failed to request module firmware image");
@@ -288,6 +287,7 @@ static int module_flash_fw(struct net_device *dev, struct nlattr **tb,
 			   struct netlink_ext_ack *extack)
 {
 	struct ethtool_module_fw_flash_params params = {};
+	const char *file_name;
 	struct nlattr *attr;
 
 	if (!tb[ETHTOOL_A_MODULE_FW_FLASH_FILE_NAME]) {
@@ -297,8 +297,7 @@ static int module_flash_fw(struct net_device *dev, struct nlattr **tb,
 		return -EINVAL;
 	}
 
-	params.file_name =
-		nla_data(tb[ETHTOOL_A_MODULE_FW_FLASH_FILE_NAME]);
+	file_name = nla_data(tb[ETHTOOL_A_MODULE_FW_FLASH_FILE_NAME]);
 
 	attr = tb[ETHTOOL_A_MODULE_FW_FLASH_PASSWORD];
 	if (attr) {
@@ -306,7 +305,7 @@ static int module_flash_fw(struct net_device *dev, struct nlattr **tb,
 		params.password_valid = true;
 	}
 
-	return module_flash_fw_schedule(dev, &params, extack);
+	return module_flash_fw_schedule(dev, file_name, &params, extack);
 }
 
 int ethnl_act_module_fw_flash(struct sk_buff *skb, struct genl_info *info)
diff --git a/net/ethtool/module_fw.h b/net/ethtool/module_fw.h
index 969de116f995..888f082f8daf 100644
--- a/net/ethtool/module_fw.h
+++ b/net/ethtool/module_fw.h
@@ -13,12 +13,10 @@ void ethtool_cmis_fw_update(struct work_struct *work);
 
 /**
  * struct ethtool_module_fw_flash_params - module firmware flashing parameters
- * @file_name: Firmware image file name.
  * @password: Module password. Only valid when @pass_valid is set.
  * @password_valid: Whether the module password is valid or not.
  */
 struct ethtool_module_fw_flash_params {
-	const char *file_name;
 	u32 password;
 	u8 password_valid:1;
 };