[SRU][F][G][PATCH 1/1] net/mlx5e: Fix endianness handling in pedit mask

[frank.heimes at canonical.com]

From: Sebastian Hense <sebastian.hense1 at ibm.com>

BugLink: https://bugs.launchpad.net/bugs/1872726

The mask value is provided as 64 bit and has to be casted in
either 32 or 16 bit. On big endian systems the wrong half was
casted which resulted in an all zero mask.

Fixes: 2b64beba0251 ("net/mlx5e: Support header re-write of partial fields in TC pedit offload")

Signed-off-by: Sebastian Hense <sebastian.hense1 at ibm.com>
Reviewed-by: Roi Dayan <roid at mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm at mellanox.com>
(backported from commit 404402abd5f90aa90a134eb9604b1750c1941529)
Signed-off-by: Frank Heimes <frank.heimes at canonical.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index ec117e441425..a8817ded2959 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2424,10 +2424,11 @@ static int offload_pedit_fields(struct pedit_headers_action *hdrs,
 		field_bsize = f->size * BITS_PER_BYTE;
 
 		if (field_bsize == 32) {
-			mask_be32 = *(__be32 *)&mask;
+			mask_be32 = (__be32)mask;
 			mask = (__force unsigned long)cpu_to_le32(be32_to_cpu(mask_be32));
 		} else if (field_bsize == 16) {
-			mask_be16 = *(__be16 *)&mask;
+			mask_be32 = (__be32)mask;
+			mask_be16 = *(__be16 *)&mask_be32;
 			mask = (__force unsigned long)cpu_to_le16(be16_to_cpu(mask_be16));
 		}
 
-- 
2.25.1