netdev - [net-next v3 6/7] mlx5: reject unsupported external timestamp flags

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Date:   Thu, 26 Sep 2019 11:11:08 -0700
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     netdev@...r.kernel.org
Cc:     Intel Wired LAN <intel-wired-lan@...ts.osuosl.org>,
        Jeffrey Kirsher <jeffrey.t.kirsher@...el.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Feras Daoud <ferasda@...lanox.com>,
        Eugenia Emantayev <eugenia@...lanox.com>
Subject: [net-next v3 6/7] mlx5: reject unsupported external timestamp flags

Fix the mlx5 core PTP support to explicitly reject any future flags that
get added to the external timestamp request ioctl.

In order to maintain currently functioning code, this patch accepts all
three current flags. This is because the PTP_RISING_EDGE and
PTP_FALLING_EDGE flags have unclear semantics and each driver seems to
have interpreted them slightly differently.

Cc: Feras Daoud <ferasda@...lanox.com>
Cc: Eugenia Emantayev <eugenia@...lanox.com>
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index cff6b60de304..9a40f24e3193 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -236,6 +236,12 @@ static int mlx5_extts_configure(struct ptp_clock_info *ptp,
 	if (!MLX5_PPS_CAP(mdev))
 		return -EOPNOTSUPP;
 
+	/* Reject requests with unsupported flags */
+	if (rq->extts.flags & ~(PTP_ENABLE_FEATURE |
+				PTP_RISING_EDGE |
+				PTP_FALLING_EDGE))
+		return -EOPNOTSUPP;
+
 	if (rq->extts.index >= clock->ptp_info.n_pins)
 		return -EINVAL;
 
-- 
2.23.0.245.gf157bbb9169d