[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20250905-gxrings-v1-2-984fc471f28f@debian.org>
Date: Fri, 05 Sep 2025 10:07:21 -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 2/7] net: ethtool: add support for
ETHTOOL_GRXRINGS ioctl
This patch adds handling for the ETHTOOL_GRXRINGS ioctl command in the
ethtool ioctl dispatcher. It introduces a new helper function
ethtool_get_rxrings() that calls the driver's get_rxnfc() callback with
appropriate parameters to retrieve the number of RX rings supported
by the device.
By explicitly handling ETHTOOL_GRXRINGS, userspace queries through
ethtool can now obtain RX ring information in a structured manner.
In this patch, ethtool_get_rxrings() is a simply copy of
ethtool_get_rxnfc().
Signed-off-by: Breno Leitao <leitao@...ian.org>
---
net/ethtool/ioctl.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 15627afa4424f..4214ab33c3c81 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1208,6 +1208,44 @@ static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
return 0;
}
+static noinline_for_stack int ethtool_get_rxrings(struct net_device *dev,
+ u32 cmd,
+ void __user *useraddr)
+{
+ struct ethtool_rxnfc info;
+ 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;
+
+ ret = ethtool_rxnfc_copy_struct(cmd, &info, &info_size, useraddr);
+ 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);
+ 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;
+}
+
static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
u32 cmd, void __user *useraddr)
{
@@ -3377,6 +3415,8 @@ __dev_ethtool(struct net *net, struct ifreq *ifr, void __user *useraddr,
rc = ethtool_set_rxfh_fields(dev, ethcmd, useraddr);
break;
case ETHTOOL_GRXRINGS:
+ rc = ethtool_get_rxrings(dev, ethcmd, useraddr);
+ break;
case ETHTOOL_GRXCLSRLCNT:
case ETHTOOL_GRXCLSRULE:
case ETHTOOL_GRXCLSRLALL:
--
2.47.3
Powered by blists - more mailing lists