netdev - [PATCH net 1/1] net: macsec: Fix XPN properties passing to macsec offload

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Date:   Tue, 9 Aug 2022 13:29:05 +0300
From:   Emeel Hakim <ehakim@...dia.com>
To:     <edumazet@...gle.com>, <mayflowerera@...il.com>
CC:     <kuba@...nel.org>, <pabeni@...hat.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Emeel Hakim <ehakim@...dia.com>,
        Raed Salem <raeds@...dia.com>
Subject: [PATCH net 1/1] net: macsec: Fix XPN properties passing to macsec offload

Currently macsec invokes HW offload path before reading extended
packet number (XPN) related user properties i.e. salt and short
secure channel identifier (ssci), hence preventing macsec XPN HW
offload.

Fix by moving macsec XPN properties reading prior to HW offload path.

Fixes: 48ef50fa866a ("macsec: Netlink support of XPN cipher suites")
Reviewed-by: Raed Salem <raeds@...dia.com>
Signed-off-by: Emeel Hakim <ehakim@...dia.com>
---
 drivers/net/macsec.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index f1683ce6b561..e0da161d94c8 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -1808,6 +1808,12 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
 
 	rx_sa->sc = rx_sc;
 
+	if (secy->xpn) {
+		rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
+		nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
+			   MACSEC_SALT_LEN);
+	}
+
 	/* If h/w offloading is available, propagate to the device */
 	if (macsec_is_offloaded(netdev_priv(dev))) {
 		const struct macsec_ops *ops;
@@ -1830,12 +1836,6 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
 			goto cleanup;
 	}
 
-	if (secy->xpn) {
-		rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
-		nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
-			   MACSEC_SALT_LEN);
-	}
-
 	nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
 	rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
 
@@ -2050,6 +2050,12 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
 	if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
 		secy->operational = true;
 
+	if (secy->xpn) {
+		tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
+		nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
+			   MACSEC_SALT_LEN);
+	}
+
 	/* If h/w offloading is available, propagate to the device */
 	if (macsec_is_offloaded(netdev_priv(dev))) {
 		const struct macsec_ops *ops;
@@ -2072,12 +2078,6 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
 			goto cleanup;
 	}
 
-	if (secy->xpn) {
-		tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
-		nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
-			   MACSEC_SALT_LEN);
-	}
-
 	nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
 	rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
 
-- 
2.21.3