Release 4.18 drivers/staging/unisys/include/iochannel.h
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2010 - 2016 UNISYS CORPORATION
* All rights reserved.
*/
#ifndef __IOCHANNEL_H__
#define __IOCHANNEL_H__
/*
* Everything needed for IOPart-GuestPart communication is define in
* this file. Note: Everything is OS-independent because this file is
* used by Windows, Linux and possible EFI drivers.
*
* Communication flow between the IOPart and GuestPart uses the channel headers
* channel state. The following states are currently being used:
* UNINIT(All Zeroes), CHANNEL_ATTACHING, CHANNEL_ATTACHED, CHANNEL_OPENED
*
* Additional states will be used later. No locking is needed to switch between
* states due to the following rules:
*
* 1. IOPart is only the only partition allowed to change from UNIT
* 2. IOPart is only the only partition allowed to change from
* CHANNEL_ATTACHING
* 3. GuestPart is only the only partition allowed to change from
* CHANNEL_ATTACHED
*
* The state changes are the following: IOPart sees the channel is in UNINIT,
* UNINIT -> CHANNEL_ATTACHING (performed only by IOPart)
* CHANNEL_ATTACHING -> CHANNEL_ATTACHED (performed only by IOPart)
* CHANNEL_ATTACHED -> CHANNEL_OPENED (performed only by GuestPart)
*/
#include <linux/uuid.h>
#include <linux/skbuff.h>
#include <linux/visorbus.h>
/*
* Must increment these whenever you insert or delete fields within this channel
* struct. Also increment whenever you change the meaning of fields within this
* channel struct so as to break pre-existing software. Note that you can
* usually add fields to the END of the channel struct without needing to
* increment this.
*/
#define VISOR_VHBA_CHANNEL_VERSIONID 2
#define VISOR_VNIC_CHANNEL_VERSIONID 2
/*
* Everything necessary to handle SCSI & NIC traffic between Guest Partition and
* IO Partition is defined below.
*/
/*
* Define the two queues per data channel between iopart and ioguestparts.
* IOCHAN_TO_IOPART -- used by guest to 'insert' signals to iopart.
* IOCHAN_FROM_IOPART -- used by guest to 'remove' signals from IO part.
*/
#define IOCHAN_TO_IOPART 0
#define IOCHAN_FROM_IOPART 1
/* Size of cdb - i.e., SCSI cmnd */
#define MAX_CMND_SIZE 16
/* Unisys-specific DMA direction values */
enum uis_dma_data_direction {
UIS_DMA_BIDIRECTIONAL = 0,
UIS_DMA_TO_DEVICE = 1,
UIS_DMA_FROM_DEVICE = 2,
UIS_DMA_NONE = 3
};
#define MAX_SENSE_SIZE 64
#define MAX_PHYS_INFO 64
/*
* enum net_types - Various types of network packets that can be sent in cmdrsp.
* @NET_RCV_POST: Submit buffer to hold receiving incoming packet.
* @NET_RCV: visornic -> uisnic. Incoming packet received.
* @NET_XMIT: uisnic -> visornic. For outgoing packet.
* @NET_XMIT_DONE: visornic -> uisnic. Outgoing packet xmitted.
* @NET_RCV_ENBDIS: uisnic -> visornic. Enable/Disable packet reception.
* @NET_RCV_ENBDIS_ACK: visornic -> uisnic. Acknowledge enable/disable packet.
* @NET_RCV_PROMISC: uisnic -> visornic. Enable/Disable promiscuous mode.
* @NET_CONNECT_STATUS: visornic -> uisnic. Indicate the loss or restoration of
* a network connection.
* @NET_MACADDR: uisnic -> visornic. Indicates the client has requested
* to update it's MAC address.
* @NET_MACADDR_ACK: MAC address acknowledge.
*/
enum net_types {
NET_RCV_POST = 0,
NET_RCV,
NET_XMIT,
NET_XMIT_DONE,
NET_RCV_ENBDIS,
NET_RCV_ENBDIS_ACK,
/* Reception */
NET_RCV_PROMISC,
NET_CONNECT_STATUS,
NET_MACADDR,
NET_MACADDR_ACK,
};
/* Minimum eth data size */
#define ETH_MIN_DATA_SIZE 46
#define ETH_MIN_PACKET_SIZE (ETH_HLEN + ETH_MIN_DATA_SIZE)
/* Maximum data size */
#define VISOR_ETH_MAX_MTU 16384
#ifndef MAX_MACADDR_LEN
/* Number of bytes in MAC address */
#define MAX_MACADDR_LEN 6
#endif
/* Various types of scsi task mgmt commands. */
enum task_mgmt_types {
TASK_MGMT_ABORT_TASK = 1,
TASK_MGMT_BUS_RESET,
TASK_MGMT_LUN_RESET,
TASK_MGMT_TARGET_RESET,
};
/* Various types of vdisk mgmt commands. */
enum vdisk_mgmt_types {
VDISK_MGMT_ACQUIRE = 1,
VDISK_MGMT_RELEASE,
};
struct phys_info {
u64 pi_pfn;
u16 pi_off;
u16 pi_len;
} __packed;
#define MIN_NUMSIGNALS 64
/* Structs with pragma pack. */
struct guest_phys_info {
u64 address;
u64 length;
} __packed;
/*
* struct uisscsi_dest
* @channel: Bus number.
* @id: Target number.
* @lun: Logical unit number.
*/
struct uisscsi_dest {
u32 channel;
u32 id;
u32 lun;
} __packed;
struct vhba_wwnn {
u32 wwnn1;
u32 wwnn2;
} __packed;
/*
* struct vhba_config_max
* @max_channel: Maximum channel for devices attached to this bus.
* @max_id: Maximum SCSI ID for devices attached to bus.
* @max_lun: Maximum SCSI LUN for devices attached to bus.
* @cmd_per_lun: Maximum number of outstanding commands per LUN.
* @max_io_size: Maximum io size for devices attached to this bus. Max io size
* is often determined by the resource of the hba.
* e.g Max scatter gather list length * page size / sector size.
*
* WARNING: Values stored in this structure must contain maximum counts (not
* maximum values).
*
* 20 bytes
*/
struct vhba_config_max {
u32 max_channel;
u32 max_id;
u32 max_lun;
u32 cmd_per_lun;
u32 max_io_size;
} __packed;
/*
* struct uiscmdrsp_scsi
*
* @handle: The handle to the cmd that was received. Send it back as
* is in the rsp packet.
* @cmnd: The cdb for the command.
* @bufflen: Length of data to be transferred out or in.
* @guest_phys_entries: Number of entries in scatter-gather list.
* @struct gpi_list: Physical address information for each fragment.
* @data_dir: Direction of the data, if any.
* @struct vdest: Identifies the virtual hba, id, channel, lun to which
* cmd was sent.
* @linuxstat: Original Linux status used by Linux vdisk.
* @scsistat: The scsi status.
* @addlstat: Non-scsi status.
* @sensebuf: Sense info in case cmd failed. sensebuf holds the
* sense_data struct. See sense_data struct for more
* details.
* @*vdisk: Pointer to the vdisk to clean up when IO completes.
* @no_disk_result: Used to return no disk inquiry result when
* no_disk_result is set to 1
* scsi.scsistat is SAM_STAT_GOOD
* scsi.addlstat is 0
* scsi.linuxstat is SAM_STAT_GOOD
* That is, there is NO error.
*/
struct uiscmdrsp_scsi {
u64 handle;
u8 cmnd[MAX_CMND_SIZE];
u32 bufflen;
u16 guest_phys_entries;
struct guest_phys_info gpi_list[MAX_PHYS_INFO];
u32 data_dir;
struct uisscsi_dest vdest;
/* Needed to queue the rsp back to cmd originator. */
int linuxstat;
u8 scsistat;
u8 addlstat;
#define ADDL_SEL_TIMEOUT 4
/* The following fields are need to determine the result of command. */
u8 sensebuf[MAX_SENSE_SIZE];
void *vdisk;
int no_disk_result;
} __packed;
/*
* Defines to support sending correct inquiry result when no disk is
* configured.
*
* From SCSI SPC2 -
*
* If the target is not capable of supporting a device on this logical unit, the
* device server shall set this field to 7Fh (PERIPHERAL QUALIFIER set to 011b
* and PERIPHERAL DEVICE TYPE set to 1Fh).
*
* The device server is capable of supporting the specified peripheral device
* type on this logical unit. However, the physical device is not currently
* connected to this logical unit.
*/
/*
* Peripheral qualifier of 0x3
* Peripheral type of 0x1f
* Specifies no device but target present
*/
#define DEV_NOT_CAPABLE 0x7f
/*
* Peripheral qualifier of 0x1
* Peripheral type of 0 - disk
* Specifies device capable, but not present
*/
#define DEV_DISK_CAPABLE_NOT_PRESENT 0x20
/* HiSup = 1; shows support for report luns must be returned for lun 0. */
#define DEV_HISUPPORT 0x10
/*
* Peripheral qualifier of 0x3
* Peripheral type of 0x1f
* Specifies no device but target present
*/
#define DEV_NOT_CAPABLE 0x7f
/*
* Peripheral qualifier of 0x1
* Peripheral type of 0 - disk
* Specifies device capable, but not present
*/
#define DEV_DISK_CAPABLE_NOT_PRESENT 0x20
/* HiSup = 1; shows support for report luns must be returned for lun 0. */
#define DEV_HISUPPORT 0x10
/*
* NOTE: Linux code assumes inquiry contains 36 bytes. Without checking length
* in buf[4] some Linux code accesses bytes beyond 5 to retrieve vendor, product
* and revision. Yikes! So let us always send back 36 bytes, the minimum for
* inquiry result.
*/
#define NO_DISK_INQUIRY_RESULT_LEN 36
/* 5 bytes minimum for inquiry result */
#define MIN_INQUIRY_RESULT_LEN 5
/* SCSI device version for no disk inquiry result */
/* indicates SCSI SPC2 (SPC3 is 5) */
#define SCSI_SPC2_VER 4
/* Struct and Defines to support sense information. */
/*
* The following struct is returned in sensebuf field in uiscmdrsp_scsi. It is
* initialized in exactly the manner that is recommended in Windows (hence the
* odd values).
* When set, these fields will have the following values:
* ErrorCode = 0x70 indicates current error
* Valid = 1 indicates sense info is valid
* SenseKey contains sense key as defined by SCSI specs.
* AdditionalSenseCode contains sense key as defined by SCSI specs.
* AdditionalSenseCodeQualifier contains qualifier to sense code as defined by
* scsi docs.
* AdditionalSenseLength contains will be sizeof(sense_data)-8=10.
*/
struct sense_data {
u8 errorcode:7;
u8 valid:1;
u8 segment_number;
u8 sense_key:4;
u8 reserved:1;
u8 incorrect_length:1;
u8 end_of_media:1;
u8 file_mark:1;
u8 information[4];
u8 additional_sense_length;
u8 command_specific_information[4];
u8 additional_sense_code;
u8 additional_sense_code_qualifier;
u8 fru_code;
u8 sense_key_specific[3];
} __packed;
/*
* struct net_pkt_xmt
* @len: Full length of data in the packet.
* @num_frags: Number of fragments in frags containing data.
* @struct phys_info frags: Physical page information.
* @ethhdr: The ethernet header.
* @struct lincsum: These are needed for csum at uisnic end.
* @valid: 1 = struct is valid - else ignore.
* @hrawoffv: 1 = hwrafoff is valid.
* @nhrawoffv: 1 = nhwrafoff is valid.
* @protocol: Specifies packet protocol.
* @csum: Value used to set skb->csum at IOPart.
* @hrawoff: Value used to set skb->h.raw at IOPart. hrawoff points to
* the start of the TRANSPORT LAYER HEADER.
* @nhrawoff: Value used to set skb->nh.raw at IOPart. nhrawoff points to
* the start of the NETWORK LAYER HEADER.
*
* NOTE:
* The full packet is described in frags but the ethernet header is separately
* kept in ethhdr so that uisnic doesn't have "MAP" the guest memory to get to
* the header. uisnic needs ethhdr to determine how to route the packet.
*/
struct net_pkt_xmt {
int len;
int num_frags;
struct phys_info frags[MAX_PHYS_INFO];
char ethhdr[ETH_HLEN];
struct {
u8 valid;
u8 hrawoffv;
u8 nhrawoffv;
__be16 protocol;
__wsum csum;
u32 hrawoff;
u32 nhrawoff;
} lincsum;
} __packed;
struct net_pkt_xmtdone {
/* Result of NET_XMIT */
u32 xmt_done_result;
} __packed;
/*
* RCVPOST_BUF_SIZE must be at most page_size(4096) - cache_line_size (64) The
* reason is because dev_skb_alloc which is used to generate RCV_POST skbs in
* visornic requires that there is "overhead" in the buffer, and pads 16 bytes.
* Use 1 full cache line size for "overhead" so that transfers are optimized.
* IOVM requires that a buffer be represented by 1 phys_info structure
* which can only cover page_size.
*/
#define RCVPOST_BUF_SIZE 4032
#define MAX_NET_RCV_CHAIN \
((VISOR_ETH_MAX_MTU + ETH_HLEN + RCVPOST_BUF_SIZE - 1) \
/ RCVPOST_BUF_SIZE)
/* rcv buf size must be large enough to include ethernet data len + ethernet
* header len - we are choosing 2K because it is guaranteed to be describable.
*/
struct net_pkt_rcvpost {
/* Physical page information for the single fragment 2K rcv buf */
struct phys_info frag;
/*
* Ensures that receive posts are returned to the adapter which we sent
* them from originally.
*/
u64 unique_num;
} __packed;
/*
* struct net_pkt_rcv
* @rcv_done_len: Length of the received data.
* @numrcvbufs: Contains the incoming data. Guest side MUST chain these
* together.
* @*rcvbuf: List of chained rcvbufa. Each entry is a receive buffer
* provided by NET_RCV_POST. NOTE: First rcvbuf in the
* chain will also be provided in net.buf.
* @unique_num:
* @rcvs_dropped_delta:
*
* The number of rcvbuf that can be chained is based on max mtu and size of each
* rcvbuf.
*/
struct net_pkt_rcv {
u32 rcv_done_len;
u8 numrcvbufs;
void *rcvbuf[MAX_NET_RCV_CHAIN];
u64 unique_num;
u32 rcvs_dropped_delta;
} __packed;
struct net_pkt_enbdis {
void *context;
/* 1 = enable, 0 = disable */
u16 enable;
} __packed;
struct net_pkt_macaddr {
void *context;
/* 6 bytes */
u8 macaddr[MAX_MACADDR_LEN];
} __packed;
/*
* struct uiscmdrsp_net - cmd rsp packet used for VNIC network traffic.
* @enum type:
* @*buf:
* @union:
* @struct xmt: Used for NET_XMIT.
* @struct xmtdone: Used for NET_XMIT_DONE.
* @struct rcvpost: Used for NET_RCV_POST.
* @struct rcv: Used for NET_RCV.
* @struct enbdis: Used for NET_RCV_ENBDIS, NET_RCV_ENBDIS_ACK,
* NET_RCV_PROMSIC, and NET_CONNECT_STATUS.
* @struct macaddr:
*/
struct uiscmdrsp_net {
enum net_types type;
void *buf;
union {
struct net_pkt_xmt xmt;
struct net_pkt_xmtdone xmtdone;
struct net_pkt_rcvpost rcvpost;
struct net_pkt_rcv rcv;
struct net_pkt_enbdis enbdis;
struct net_pkt_macaddr macaddr;
};
} __packed;
/*
* struct uiscmdrsp_scsitaskmgmt
* @enum tasktype: The type of task.
* @struct vdest: The vdisk for which this task mgmt is generated.
* @handle: This is a handle that the guest has saved off for its
* own use. The handle value is preserved by iopart and
* returned as in task mgmt rsp.
* @notify_handle: For Linux guests, this is a pointer to wait_queue_head
* that a thread is waiting on to see if the taskmgmt
* command has completed. When the rsp is received by
* guest, the thread receiving the response uses this to
* notify the thread waiting for taskmgmt command
* completion. It's value is preserved by iopart and
* returned as in the task mgmt rsp.
* @notifyresult_handle: This is a handle to the location in the guest where
* the result of the taskmgmt command (result field) is
* saved to when the response is handled. It's value is
* preserved by iopart and returned as is in the task mgmt
* rsp.
* @result: Result of taskmgmt command - set by IOPart.
*/
struct uiscmdrsp_scsitaskmgmt {
enum task_mgmt_types tasktype;
struct uisscsi_dest vdest;
u64 handle;
u64 notify_handle;
u64 notifyresult_handle;
char result;
#define TASK_MGMT_FAILED 0
} __packed;
/*
* struct uiscmdrsp_disknotify - Used by uissd to send disk add/remove
* notifications to Guest.
* @add: 0-remove, 1-add.
* @*v_hba: Channel info to route msg.
* @channel: SCSI Path of Disk to added or removed.
* @id: SCSI Path of Disk to added or removed.
* @lun: SCSI Path of Disk to added or removed.
*
* Note that the vHba pointer is not used by the Client/Guest side.
*/
struct uiscmdrsp_disknotify {
u8 add;
void *v_hba;
u32 channel, id, lun;
} __packed;
/* Keeping cmd and rsp info in one structure for now cmd rsp packet for SCSI */
struct uiscmdrsp {
char cmdtype;
/* Describes what type of information is in the struct */
#define CMD_SCSI_TYPE 1
#define CMD_NET_TYPE 2
#define CMD_SCSITASKMGMT_TYPE 3
#define CMD_NOTIFYGUEST_TYPE 4
union {
struct uiscmdrsp_scsi scsi;
struct uiscmdrsp_net net;
struct uiscmdrsp_scsitaskmgmt scsitaskmgmt;
struct uiscmdrsp_disknotify disknotify;
};
/* Send the response when the cmd is done (scsi and scsittaskmgmt). */
void *private_data;
/* General Purpose Queue Link */
struct uiscmdrsp *next;
/* Pointer to the nextactive commands */
struct uiscmdrsp *activeQ_next;
/* Pointer to the prevactive commands */
struct uiscmdrsp *activeQ_prev;
} __packed;
/* total = 28 bytes */
struct iochannel_vhba {
/* 8 bytes */
struct vhba_wwnn wwnn;
/* 20 bytes */
struct vhba_config_max max;
} __packed;
struct iochannel_vnic {
/* 6 bytes */
u8 macaddr[6];
/* 4 bytes */
u32 num_rcv_bufs;
/* 4 bytes */
u32 mtu;
/* 16 bytes */
guid_t zone_guid;
} __packed;
/*
* This is just the header of the IO channel. It is assumed that directly after
* this header there is a large region of memory which contains the command and
* response queues as specified in cmd_q and rsp_q SIGNAL_QUEUE_HEADERS.
*/
struct visor_io_channel {
struct channel_header channel_header;
struct signal_queue_header cmd_q;
struct signal_queue_header rsp_q;
union {
struct iochannel_vhba vhba;
struct iochannel_vnic vnic;
} __packed;
#define MAX_CLIENTSTRING_LEN 1024
/* client_string is NULL termimated so holds max-1 bytes */
u8 client_string[MAX_CLIENTSTRING_LEN];
} __packed;
/* INLINE functions for initializing and accessing I/O data channels. */
#define SIZEOF_CMDRSP (64 * DIV_ROUND_UP(sizeof(struct uiscmdrsp), 64))
/* Use 4K page sizes when passing page info between Guest and IOPartition. */
#define PI_PAGE_SIZE 0x1000
#define PI_PAGE_MASK 0x0FFF
/* __IOCHANNEL_H__ */
#endif
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