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