net/mlx5e: Fix macsec rx security association (SA) update/delete

The cited commit adds the support for update/delete MACsec Rx SA,
naturally, these operations need to check if the SA in question exists
to update/delete the SA and return error code otherwise, however they
do just the opposite i.e. return with error if the SA exists

Fix by change the check to return error in case the SA in question does
not exist, adjust error message and code accordingly.

Fixes: aae3454e ("net/mlx5e: Add MACsec offload Rx command support")
Signed-off-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20221026135153.154807-14-saeed@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c

@@ -999,11 +999,11 @@ static int mlx5e_macsec_upd_rxsa(struct macsec_context *ctx)
 	}
 
 	rx_sa = rx_sc->rx_sa[assoc_num];
-	if (rx_sa) {
+	if (!rx_sa) {
 		netdev_err(ctx->netdev,
-			   "MACsec offload rx_sc sci %lld rx_sa %d already exist\n",
+			   "MACsec offload rx_sc sci %lld rx_sa %d doesn't exist\n",
 			   sci, assoc_num);
-		err = -EEXIST;
+		err = -EINVAL;
 		goto out;
 	}
 
@@ -1055,11 +1055,11 @@ static int mlx5e_macsec_del_rxsa(struct macsec_context *ctx)
 	}
 
 	rx_sa = rx_sc->rx_sa[assoc_num];
-	if (rx_sa) {
+	if (!rx_sa) {
 		netdev_err(ctx->netdev,
-			   "MACsec offload rx_sc sci %lld rx_sa %d already exist\n",
+			   "MACsec offload rx_sc sci %lld rx_sa %d doesn't exist\n",
 			   sci, assoc_num);
-		err = -EEXIST;
+		err = -EINVAL;
 		goto out;
 	}