> +struct mlx4_en_ctrl_seg {
 > +	__be32 op_own;
 > +#define MLX4_EN_BIT_DESC_OWN	0x80000000
 > +#define MLX4_EN_OPCODE_SEND	0xa
 > +#define MLX4_EN_OPCODE_LSO	0xe
 > +	__be32 size_vlan;
 > +#define MLX4_EN_BIT_INS_VLAN	0x4000
 > +	__be32 flags;
 > +#define MLX4_EN_BIT_NO_ICRC	0x2
 > +#define MLX4_EN_BIT_TX_COMP	0xc
 > +#define MLX4_EN_BIT_TX_IP_CS	0x10
 > +#define MLX4_EN_BIT_TX_TCP_CS	0x20
 > +	__be32 reserved;
 > +};
 > +#define CTRL_SIZE	sizeof(struct mlx4_en_ctrl_seg)
 > +
 > +struct mlx4_en_data_seg {
 > +	__be32 count;
 > +#define MLX4_EN_INLINE		0x80000000
 > +	__be32 mem_type;
 > +#define MLX4_EN_MEMTYPE_PAD	0x100
 > +	__be64 addr;
 > +};
 > +#define DS_SIZE		sizeof(struct mlx4_en_data_seg)
 > +
 > +struct mlx4_en_lso_seg {
 > +	__be16 mss;
 > +	__be16 header_size;
 > +#define LSO_PREFIX_SIZE		4
 > +	u8 header_data[0]; /* copy of L2/IP/TCP headers */
 > +#define MLX4_EN_MAX_LSO_HEADER	(MAX_DESC_SIZE - CTRL_SIZE - DS_SIZE)
 > +};

I think it would be better to reuse the mlx4_wqe_ctrl_seg,
mlx4_wqe_data_seg and mlx4_wqe_lso_seg already defined in
<linux/mlx4/qp.h>.  That was the whole point in putting those structures
in a common location.
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