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