il_cmd_header
sizeof(struct il3945_tx_cmd) + sizeof(struct il_cmd_header) +
len = sizeof(struct il_tx_cmd) + sizeof(struct il_cmd_header) + hdr_len;
txcmd_phys + sizeof(struct il_cmd_header) +
struct il_cmd_header hdr;
struct il_cmd_header hdr; /* uCode API */
struct il_cmd_header hdr; /* uCode API */
u8 payload[IL_MAX_CMD_SIZE - sizeof(struct il_cmd_header)];