netdev - [PATCH net-next 1/3] macsec: Enable devices to advertise whether they update sk_buff md

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Date: Thu, 18 Apr 2024 18:17:15 -0700
From: Rahul Rameshbabu <rrameshbabu@...dia.com>
To: netdev@...r.kernel.org,
	stable@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Paolo Abeni <pabeni@...hat.com>,
	Gal Pressman <gal@...dia.com>,
	Tariq Toukan <tariqt@...dia.com>,
	Sabrina Dubroca <sd@...asysnail.net>,
	Yossi Kuperman <yossiku@...dia.com>,
	Benjamin Poirier <bpoirier@...dia.com>,
	Cosmin Ratiu <cratiu@...dia.com>,
	Rahul Rameshbabu <rrameshbabu@...dia.com>
Subject: [PATCH net-next 1/3] macsec: Enable devices to advertise whether they update sk_buff md_dst during offloads

Cannot know whether a Rx skb missing md_dst is intended for MACsec or not
without knowing whether the device is able to update this field during an
offload. Assume that an offload to a MACsec device cannot support updating
md_dst by default. Capable devices can advertise that they do indicate that
an skb is related to a MACsec offloaded packet using the md_dst.

Cc: Sabrina Dubroca <sd@...asysnail.net>
Cc: stable@...r.kernel.org
Signed-off-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
Reviewed-by: Benjamin Poirier <bpoirier@...dia.com>
Reviewed-by: Cosmin Ratiu <cratiu@...dia.com>
---
 include/net/macsec.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/net/macsec.h b/include/net/macsec.h
index dbd22180cc5c..de216cbc6b05 100644
--- a/include/net/macsec.h
+++ b/include/net/macsec.h
@@ -321,6 +321,7 @@ struct macsec_context {
  *	for the TX tag
  * @needed_tailroom: number of bytes reserved at the end of the sk_buff for the
  *	TX tag
+ * @rx_uses_md_dst: whether MACsec device offload supports sk_buff md_dst
  */
 struct macsec_ops {
 	/* Device wide */
@@ -352,6 +353,7 @@ struct macsec_ops {
 				 struct sk_buff *skb);
 	unsigned int needed_headroom;
 	unsigned int needed_tailroom;
+	bool rx_uses_md_dst;
 };
 
 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa);
-- 
2.42.0