netdev - [PATCH net-next v1] ethtool: ethtool_get_drvinfo: populate drvinfo fields even if callback exits

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Date:   Tue,  8 Nov 2022 12:57:54 +0900
From:   Vincent Mailhol <mailhol.vincent@...adoo.fr>
To:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Guangbin Huang <huangguangbin2@...wei.com>,
        Hao Chen <chenhao288@...ilicon.com>,
        Sean Anderson <sean.anderson@...o.com>,
        Tom Rix <trix@...hat.com>,
        Tonghao Zhang <xiangxia.m.yue@...il.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Marco Bonelli <marco@...eim.net>, linux-kernel@...r.kernel.org,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>
Subject: [PATCH net-next v1] ethtool: ethtool_get_drvinfo: populate drvinfo fields even if callback exits

If ethtool_ops::get_drvinfo() callback isn't set,
ethtool_get_drvinfo() will fill the ethtool_drvinfo::name and
ethtool_drvinfo::bus_info fields.

However, if the driver provides the callback function, those two
fields are not touched. This means that the driver has to fill these
itself.

Allow the driver to leave those two fields empty and populate them in
such case. This way, the driver can rely on the default values for the
name and the bus_info. If the driver provides values, do nothing.

Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
---
 net/ethtool/ioctl.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 57e7238a4136..546f931c3b6c 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -713,15 +713,22 @@ static int
 ethtool_get_drvinfo(struct net_device *dev, struct ethtool_devlink_compat *rsp)
 {
 	const struct ethtool_ops *ops = dev->ethtool_ops;
+	struct device *parent = dev->dev.parent;
 
 	rsp->info.cmd = ETHTOOL_GDRVINFO;
 	strscpy(rsp->info.version, UTS_RELEASE, sizeof(rsp->info.version));
 	if (ops->get_drvinfo) {
 		ops->get_drvinfo(dev, &rsp->info);
-	} else if (dev->dev.parent && dev->dev.parent->driver) {
-		strscpy(rsp->info.bus_info, dev_name(dev->dev.parent),
+		if (!rsp->info.bus_info[0] && parent)
+			strscpy(rsp->info.bus_info, dev_name(parent),
+				sizeof(rsp->info.bus_info));
+		if (!rsp->info.driver[0] && parent && parent->driver)
+			strscpy(rsp->info.driver, parent->driver->name,
+				sizeof(rsp->info.driver));
+	} else if (parent && parent->driver) {
+		strscpy(rsp->info.bus_info, dev_name(parent),
 			sizeof(rsp->info.bus_info));
-		strscpy(rsp->info.driver, dev->dev.parent->driver->name,
+		strscpy(rsp->info.driver, parent->driver->name,
 			sizeof(rsp->info.driver));
 	} else if (dev->rtnl_link_ops) {
 		strscpy(rsp->info.driver, dev->rtnl_link_ops->kind,
-- 
2.37.4