netdev - [PATCH RFC net-next 3/7] net: ethtool: remove the duplicated handling from ethtool_get

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Message-Id: <20250905-gxrings-v1-3-984fc471f28f@debian.org>
Date: Fri, 05 Sep 2025 10:07:22 -0700
From: Breno Leitao <leitao@...ian.org>
To: Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
 kuba@...nel.org, Simon Horman <horms@...nel.org>, 
 "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
 Eugenio Pérez <eperezma@...hat.com>, 
 Andrew Lunn <andrew+netdev@...n.ch>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 virtualization@...ts.linux.dev, Breno Leitao <leitao@...ian.org>, 
 jdamato@...tly.com, kernel-team@...a.com
Subject: [PATCH RFC net-next 3/7] net: ethtool: remove the duplicated
 handling from ethtool_get_rxrings

ethtool_get_rxrings() was a copy of ethtool_get_rxnfc(). Clean the code
that will never be executed for GRXRINGS specifically.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 net/ethtool/ioctl.c | 21 +++------------------
 1 file changed, 3 insertions(+), 18 deletions(-)

diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 4214ab33c3c81..1a9ad47f60313 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1216,7 +1216,6 @@ static noinline_for_stack int ethtool_get_rxrings(struct net_device *dev,
 	size_t info_size = sizeof(info);
 	const struct ethtool_ops *ops = dev->ethtool_ops;
 	int ret;
-	void *rule_buf = NULL;

 	if (!ops->get_rxnfc)
 		return -EOPNOTSUPP;
@@ -1225,25 +1224,11 @@ static noinline_for_stack int ethtool_get_rxrings(struct net_device *dev,
 	if (ret)
 		return ret;

-	if (info.cmd == ETHTOOL_GRXCLSRLALL) {
-		if (info.rule_cnt > 0) {
-			if (info.rule_cnt <= KMALLOC_MAX_SIZE / sizeof(u32))
-				rule_buf = kcalloc(info.rule_cnt, sizeof(u32),
-						   GFP_USER);
-			if (!rule_buf)
-				return -ENOMEM;
-		}
-	}
-
-	ret = ops->get_rxnfc(dev, &info, rule_buf);
+	ret = ops->get_rxnfc(dev, &info, NULL);
 	if (ret < 0)
-		goto err_out;
-
-	ret = ethtool_rxnfc_copy_to_user(useraddr, &info, info_size, rule_buf);
-err_out:
-	kfree(rule_buf);
+		return ret;

-	return ret;
+	return ethtool_rxnfc_copy_to_user(useraddr, &info, info_size, NULL);
 }

 static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,

-- 
2.47.3