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Subject[PATCH net-next v4 10/15] net: macsec: PN wrap callback
Date
Allow to call macsec_pn_wrapped from hardware drivers to notify when a
PN rolls over. Some drivers might used an interrupt to implement this.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
---
drivers/net/macsec.c | 24 ++++++++++++++++++------
include/net/macsec.h | 2 ++
2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index ace7fc98e8dd..fc481616632c 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -423,6 +423,22 @@ static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
return (struct macsec_eth_header *)skb_mac_header(skb);
}

+static void __macsec_pn_wrapped(struct macsec_secy *secy,
+ struct macsec_tx_sa *tx_sa)
+{
+ pr_debug("PN wrapped, transitioning to !oper\n");
+ tx_sa->active = false;
+ if (secy->protect_frames)
+ secy->operational = false;
+}
+
+void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
+{
+ spin_lock_bh(&tx_sa->lock);
+ __macsec_pn_wrapped(secy, tx_sa);
+ spin_unlock_bh(&tx_sa->lock);
+}
+
static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
{
u32 pn;
@@ -431,12 +447,8 @@ static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
pn = tx_sa->next_pn;

tx_sa->next_pn++;
- if (tx_sa->next_pn == 0) {
- pr_debug("PN wrapped, transitioning to !oper\n");
- tx_sa->active = false;
- if (secy->protect_frames)
- secy->operational = false;
- }
+ if (tx_sa->next_pn == 0)
+ __macsec_pn_wrapped(secy, tx_sa);
spin_unlock_bh(&tx_sa->lock);

return pn;
diff --git a/include/net/macsec.h b/include/net/macsec.h
index 4d0afb79259e..a08f19099c7a 100644
--- a/include/net/macsec.h
+++ b/include/net/macsec.h
@@ -220,4 +220,6 @@ struct macsec_ops {
int (*mdo_del_txsa)(struct macsec_context *ctx);
};

+void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa);
+
#endif /* _NET_MACSEC_H_ */
--
2.24.1
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