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net: ethtool: add support for ETHTOOL_GRXRINGS ioctl

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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@debian.org>
Link: https://patch.msgid.link/20250917-gxrings-v4-2-dae520e2e1cb@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Breno Leitao
2025-09-17 02:58:09 -07:00
committed by Jakub Kicinski
parent 3efaede2e1
commit 06fad5a4ae
1 changed files with 40 additions and 0 deletions
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40
net/ethtool/ioctl.c
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@@ -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: