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net/mlx4_core: Fix struct mlx4_vhcr_cmd to make implicit padding explicit 

Struct mlx4_vhcr was implicitly padded by the gcc compiler on 64-bit
architectures.

This commit makes that padding explicit, to prevent issues with
changing compilers and with incompatibilities between 32-bit architecture
implicit padding and 64-bit architecture implicit padding.

This structure is used in virtualization for communication between
the Host and its Guests. The explicit padding allows 64-bit Hosts
(old and new) to continue to interoperate with 64-bit Guests (old and new).

However, without this fix, 64-bit Hosts could not interoperate with 32-bit
Guests (since these did not insert the padding dword). With this fix,
32-bit Guests will be able to interoperate with 64-bit Hosts (since
the structure offsets will be identical on both).

Reported-by: Alexander Schmidt <alexs@linux.vnet.ibm.com>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jack Morgenstein 2015-01-27 15:58:04 +02:00 committed by David S. Miller
parent 30a5da5b33
commit dc7d500451
1 changed files with 1 additions and 0 deletions
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drivers/net/ethernet/mellanox/mlx4/mlx4.h
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@ -196,6 +196,7 @@ struct mlx4_vhcr {
struct mlx4_vhcr_cmd {
__be64 in_param;
__be32 in_modifier;
u32 reserved1;
__be64 out_param;
__be16 token;
u16 reserved;