[PATCH net v7 3/4] net: phy: mscc: macsec: reject PN update requests

[Radu Pirea (NXP OSS)]

Updating the PN is not supported.
Return -EINVAL if update_pn is true.

The following command succeeded, but it should fail because the driver
does not update the PN:
ip macsec set macsec0 tx sa 0 pn 232 on

Fixes: 28c5107aa904 ("net: phy: mscc: macsec support")
Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@xxxxxxxxxxx>
---
Changes in v7:
- none

Changes in v6:
- patch added in v6

 drivers/net/phy/mscc/mscc_macsec.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/phy/mscc/mscc_macsec.c b/drivers/net/phy/mscc/mscc_macsec.c
index 018253a573b8..4f39ba63a9a9 100644
--- a/drivers/net/phy/mscc/mscc_macsec.c
+++ b/drivers/net/phy/mscc/mscc_macsec.c
@@ -849,6 +849,9 @@ static int vsc8584_macsec_upd_rxsa(struct macsec_context *ctx)
 	struct macsec_flow *flow;
 	int ret;
 
+	if (ctx->sa.update_pn)
+		return -EINVAL;
+
 	flow = vsc8584_macsec_find_flow(ctx, MACSEC_INGR);
 	if (IS_ERR(flow))
 		return PTR_ERR(flow);
@@ -900,6 +903,9 @@ static int vsc8584_macsec_upd_txsa(struct macsec_context *ctx)
 	struct macsec_flow *flow;
 	int ret;
 
+	if (ctx->sa.update_pn)
+		return -EINVAL;
+
 	flow = vsc8584_macsec_find_flow(ctx, MACSEC_EGR);
 	if (IS_ERR(flow))
 		return PTR_ERR(flow);
-- 
2.34.1