linux-kernel - [PATCH net-next 3/6] flow_offload: add flow_rule_no_control

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Date: Mon,  8 Apr 2024 13:09:21 +0000
From: Asbjørn Sloth Tønnesen <ast@...erby.net>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Louis Peens <louis.peens@...igine.com>,
	Taras Chornyi <taras.chornyi@...ision.eu>,
	Woojung Huh <woojung.huh@...rochip.com>,
	UNGLinuxDriver@...rochip.com
Cc: Asbjørn Sloth Tønnesen <ast@...erby.net>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yanguo Li <yanguo.li@...igine.com>,
	oss-drivers@...igine.com,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	Edward Cree <ecree.xilinx@...il.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Jiri Pirko <jiri@...nulli.us>
Subject: [PATCH net-next 3/6] flow_offload: add flow_rule_no_control_flags()

This helper can be used by drivers, that doesn't support
any control flags, to reject any attempt to install rules
with control flags.

This is aimed at drivers, which uses flow_rule_match_control(),
but doesn't implement any control flags.

Only compile-tested.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@...erby.net>
---
 include/net/flow_offload.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
index c1317b14da08c..415d225204a1f 100644
--- a/include/net/flow_offload.h
+++ b/include/net/flow_offload.h
@@ -471,6 +471,19 @@ static inline bool flow_rule_no_unsupp_control_flags(const u32 supp_flags,
 	return false;
 }
 
+/**
+ * flow_rule_no_control_flags() - check for presence of any control flags
+ * @flags: flags present in rule
+ * @extack: The netlink extended ACK for reporting errors.
+ *
+ * Returns true if no control flags are set, false otherwise.
+ */
+static inline bool flow_rule_no_control_flags(const u32 flags,
+					      struct netlink_ext_ack *extack)
+{
+	return flow_rule_no_unsupp_control_flags(0, flags, extack);
+}
+
 struct flow_stats {
 	u64	pkts;
 	u64	bytes;
-- 
2.43.0