mirror of
https://github.com/akuker/RASCSI.git
synced 2024-11-22 16:33:17 +00:00
133 lines
4.1 KiB
C++
133 lines
4.1 KiB
C++
//---------------------------------------------------------------------------
|
||
//
|
||
// SCSI Target Emulator PiSCSI
|
||
// for Raspberry Pi
|
||
//
|
||
// Copyright (C) 2020 akuker
|
||
// Copyright (C) 2014-2020 GIMONS
|
||
// Copyright (C) 2001-2006 ＰＩ．(ytanaka@ipc-tokai.or.jp)
|
||
//
|
||
// Licensed under the BSD 3-Clause License.
|
||
// See LICENSE file in the project root folder.
|
||
//
|
||
// [ Emulation of the DaynaPort SCSI Link Ethernet interface ]
|
||
//
|
||
// This design is derived from the SLINKCMD.TXT file, as well as David Kuder's
|
||
// Tiny SCSI Emulator
|
||
// - SLINKCMD: http://www.bitsavers.org/pdf/apple/scsi/dayna/daynaPORT/SLINKCMD.TXT
|
||
// - Tiny SCSI : https://hackaday.io/project/18974-tiny-scsi-emulator
|
||
//
|
||
// Special thanks to @PotatoFi for loaning me his Farallon EtherMac for
|
||
// this development. (Farallon's EtherMac is a re-branded DaynaPort
|
||
// SCSI/Link-T).
|
||
//
|
||
// This does NOT include the file system functionality that is present
|
||
// in the Sharp X68000 host bridge.
|
||
//
|
||
// Note: This requires a DaynaPort SCSI Link driver.
|
||
//---------------------------------------------------------------------------
|
||
|
||
#pragma once
|
||
|
||
#include "primary_device.h"
|
||
#include "ctapdriver.h"
|
||
#include <net/ethernet.h>
|
||
#include <string>
|
||
#include <span>
|
||
#include <unordered_map>
|
||
#include <array>
|
||
|
||
//===========================================================================
|
||
//
|
||
// DaynaPort SCSI Link
|
||
//
|
||
//===========================================================================
|
||
class SCSIDaynaPort : public PrimaryDevice
|
||
{
|
||
uint64_t byte_read_count = 0;
|
||
uint64_t byte_write_count = 0;
|
||
|
||
inline static const string BYTE_READ_COUNT = "byte_read_count";
|
||
inline static const string BYTE_WRITE_COUNT = "byte_write_count";
|
||
|
||
public:
|
||
|
||
explicit SCSIDaynaPort(int);
|
||
~SCSIDaynaPort() override = default;
|
||
|
||
bool Init(const param_map&) override;
|
||
void CleanUp() override;
|
||
|
||
param_map GetDefaultParams() const override { return tap.GetDefaultParams(); }
|
||
|
||
// Commands
|
||
vector<uint8_t> InquiryInternal() const override;
|
||
int Read(cdb_t, vector<uint8_t>&, uint64_t);
|
||
bool Write(cdb_t, span<const uint8_t>);
|
||
|
||
int RetrieveStats(cdb_t, vector<uint8_t>&) const;
|
||
|
||
void TestUnitReady() override;
|
||
void Read6();
|
||
void Write6() const;
|
||
void RetrieveStatistics() const;
|
||
void SetInterfaceMode() const;
|
||
void SetMcastAddr() const;
|
||
void EnableInterface() const;
|
||
|
||
vector<PbStatistics> GetStatistics() const override;
|
||
|
||
static const int DAYNAPORT_BUFFER_SIZE = 0x1000000;
|
||
|
||
static const int CMD_SCSILINK_STATS = 0x09;
|
||
static const int CMD_SCSILINK_ENABLE = 0x0E;
|
||
static const int CMD_SCSILINK_SET = 0x0C;
|
||
static const int CMD_SCSILINK_SETMAC = 0x40;
|
||
static const int CMD_SCSILINK_SETMODE = 0x80;
|
||
|
||
// When we're reading the Linux tap device, most of the messages will not be for us, so we
|
||
// need to filter through those. However, we don't want to keep re-reading the packets
|
||
// indefinitely. So, we'll pick a large-ish number that will cause the emulated DaynaPort
|
||
// to respond with "no data" after MAX_READ_RETRIES tries.
|
||
static const int MAX_READ_RETRIES = 50;
|
||
|
||
// The READ response has a header which consists of:
|
||
// 2 bytes - payload size
|
||
// 4 bytes - status flags
|
||
static const uint32_t DAYNAPORT_READ_HEADER_SZ = 2 + 4;
|
||
|
||
private:
|
||
|
||
enum class read_data_flags_t : uint32_t {
|
||
e_no_more_data = 0x00000000,
|
||
e_more_data_available = 0x00000001,
|
||
e_dropped_packets = 0xFFFFFFFF,
|
||
};
|
||
|
||
using scsi_resp_read_t = struct __attribute__((packed)) {
|
||
uint32_t length;
|
||
read_data_flags_t flags;
|
||
byte pad;
|
||
array<byte, ETH_FRAME_LEN + sizeof(uint32_t)> data; // Frame length + 4 byte CRC
|
||
};
|
||
|
||
using scsi_resp_link_stats_t = struct __attribute__((packed)) {
|
||
array<byte, 6> mac_address;
|
||
uint32_t frame_alignment_errors;
|
||
uint32_t crc_errors;
|
||
uint32_t frames_lost;
|
||
};
|
||
|
||
scsi_resp_link_stats_t m_scsi_link_stats = {
|
||
// TODO Remove this hard-coded MAC address, see https://github.com/PiSCSI/piscsi/issues/598
|
||
.mac_address = { byte{0x00}, byte{0x80}, byte{0x19}, byte{0x10}, byte{0x98}, byte{0xe3} },
|
||
.frame_alignment_errors = 0,
|
||
.crc_errors = 0,
|
||
.frames_lost = 0,
|
||
};
|
||
|
||
CTapDriver tap;
|
||
|
||
bool tap_enabled = false;
|
||
};
|