netdev - [RFC PATCH net-next 1/7] net: ethtool: netlink: introduce ethnl_update

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Date:   Wed, 17 Aug 2022 01:29:14 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Michal Kubecek <mkubecek@...e.cz>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Rui Sousa <rui.sousa@....com>,
        Ferenc Fejes <ferenc.fejes@...csson.com>
Subject: [RFC PATCH net-next 1/7] net: ethtool: netlink: introduce ethnl_update_bool()

For a reason I can't really understand, ethnl_update_bool32() exists,
but the plain function that operates on a boolean value kept in an
actual u8 netlink attribute doesn't. Introduce it; it's needed for
things like verify-disabled for the MAC merge configuration.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/ethtool/netlink.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index c0d587611854..1653fd2cf0cf 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -111,6 +111,32 @@ static inline void ethnl_update_u8(u8 *dst, const struct nlattr *attr,
 	*mod = true;
 }
 
+/**
+ * ethnl_update_bool() - update bool from NLA_U8 attribute
+ * @dst:  value to update
+ * @attr: netlink attribute with new value or null
+ * @mod:  pointer to bool for modification tracking
+ *
+ * Use the u8 value from NLA_U8 netlink attribute @attr to set bool variable
+ * pointed to by @dst to false (if zero) or 1 (if not); do nothing if @attr is
+ * null. Bool pointed to by @mod is set to true if this function changed the
+ * logical value of *dst, otherwise it is left as is.
+ */
+static inline void ethnl_update_bool(bool *dst, const struct nlattr *attr,
+				     bool *mod)
+{
+	u8 val;
+
+	if (!attr)
+		return;
+	val = !!nla_get_u8(attr);
+	if (*dst == val)
+		return;
+
+	*dst = val;
+	*mod = true;
+}
+
 /**
  * ethnl_update_bool32() - update u32 used as bool from NLA_U8 attribute
  * @dst:  value to update
-- 
2.34.1