From 356f9793df0411479e5b156d637c2c5bcce95935 Mon Sep 17 00:00:00 2001
From: Alaa Hleihel <ahleihel@redhat.com>
Date: Sun, 10 May 2020 14:52:43 -0400
Subject: [PATCH 067/312] [netdrv] mlx5: reject unsupported external timestamp
flags
Message-id: <20200510145245.10054-81-ahleihel@redhat.com>
Patchwork-id: 306621
Patchwork-instance: patchwork
O-Subject: [RHEL8.3 BZ 1789378 v2 80/82] mlx5: reject unsupported external timestamp flags
Bugzilla: 1789378
RH-Acked-by: Kamal Heib <kheib@redhat.com>
RH-Acked-by: Jarod Wilson <jarod@redhat.com>
RH-Acked-by: Tony Camuso <tcamuso@redhat.com>
RH-Acked-by: Jonathan Toppins <jtoppins@redhat.com>
Bugzilla: http://bugzilla.redhat.com/1789378
Upstream: v5.4-rc8
commit 2e0645a00e25f7122cad6da57ce3cc855df49ddd
Author: Jacob Keller <jacob.e.keller@intel.com>
Date: Thu Nov 14 10:45:00 2019 -0800
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.
[ RC: I'm not 100% sure what this driver does, but if I'm not wrong it
follows the dp83640:
flags Meaning
---------------------------------------------------- --------------------------
PTP_ENABLE_FEATURE Time stamp rising edge
PTP_ENABLE_FEATURE|PTP_RISING_EDGE Time stamp rising edge
PTP_ENABLE_FEATURE|PTP_FALLING_EDGE Time stamp falling edge
PTP_ENABLE_FEATURE|PTP_RISING_EDGE|PTP_FALLING_EDGE Time stamp falling edge
]
Cc: Feras Daoud <ferasda@mellanox.com>
Cc: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Alaa Hleihel <ahleihel@redhat.com>
Signed-off-by: Frantisek Hrbata <fhrbata@redhat.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 9a40f24e3193..34190e888521 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -242,6 +242,12 @@ static int mlx5_extts_configure(struct ptp_clock_info *ptp,
PTP_FALLING_EDGE))
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;
--
2.13.6