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Commit 209e3500 authored by Erik Arfvidson's avatar Erik Arfvidson Committed by Greg Kroah-Hartman
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staging: unisys: include: fixed iochannel.h comments 

The purpose of this patch is to add style consistency and beautify the
entire file.

Grammar:
Uppercased beginning of new sentences/paragraphs
Missing ' and .
Fixed several comments using prefix phrase "as is in" to "as in"
Standard Grammar

Comments:
Fixed comments to follow the multiline styling
All comments are now either same line or above variable/definitions
Removed nested slash-star comments
Removed a random comment left by accident
Aligned star comments
Signed-off-by: default avatarErik Arfvidson <erik.arfvidson@unisys.com>
Signed-off-by: default avatarDavid Kershner <david.kershner@unisys.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c208faef
Hide whitespace changes
Inline Side-by-side
Showing with 176 additions and 147 deletions
drivers/staging/unisys/include/iochannel.h
View file @ 209e3500
/* Copyright (C) 2010 - 2013 UNISYS CORPORATION */
/* 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
* 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:
* 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
* 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
......@@ -39,10 +39,11 @@
#define ULTRA_VSWITCH_CHANNEL_PROTOCOL_SIGNATURE \
ULTRA_CHANNEL_PROTOCOL_SIGNATURE
/* 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
/*
* 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 ULTRA_VHBA_CHANNEL_PROTOCOL_VERSIONID 2
......@@ -70,46 +71,49 @@
#define MINNUM(a, b) (((a) < (b)) ? (a) : (b))
#define MAXNUM(a, b) (((a) > (b)) ? (a) : (b))
/* define the two queues per data channel between iopart and ioguestparts */
/* used by ioguestpart to 'insert' signals to iopart */
/* Define the two queues per data channel between iopart and ioguestparts. */
/* Used by ioguestpart to 'insert' signals to iopart. */
#define IOCHAN_TO_IOPART 0
/* used by ioguestpart to 'remove' signals from iopart, same previous queue */
/* Used by ioguestpart to 'remove' signals from iopart, same previous queue. */
#define IOCHAN_FROM_IOPART 1
/* size of cdb - i.e., scsi cmnd */
/* Size of cdb - i.e., SCSI cmnd */
#define MAX_CMND_SIZE 16
#define MAX_SENSE_SIZE 64
#define MAX_PHYS_INFO 64
/* various types of network packets that can be sent in cmdrsp */
/* Various types of network packets that can be sent in cmdrsp. */
enum net_types {
NET_RCV_POST = 0, /* submit buffer to hold receiving
NET_RCV_POST = 0, /*
* Submit buffer to hold receiving
* incoming packet
*/
/* virtnic -> uisnic */
/* visornic -> uisnic */
NET_RCV, /* incoming packet received */
/* uisnic -> virtpci */
NET_XMIT, /* for outgoing net packets */
/* virtnic -> uisnic */
/* visornic -> uisnic */
NET_XMIT_DONE, /* outgoing packet xmitted */
/* uisnic -> virtpci */
NET_RCV_ENBDIS, /* enable/disable packet reception */
/* virtnic -> uisnic */
/* visornic -> uisnic */
NET_RCV_ENBDIS_ACK, /* acknowledge enable/disable packet */
/* reception */
/* uisnic -> virtnic */
/* uisnic -> visornic */
NET_RCV_PROMISC, /* enable/disable promiscuous mode */
/* virtnic -> uisnic */
NET_CONNECT_STATUS, /* indicate the loss or restoration of a network
/* visornic -> uisnic */
NET_CONNECT_STATUS, /*
* indicate the loss or restoration of a network
* connection
*/
/* uisnic -> virtnic */
NET_MACADDR, /* indicates the client has requested to update
* its MAC addr
/* uisnic -> visornic */
NET_MACADDR, /*
* Indicates the client has requested to update
* it's MAC address
*/
NET_MACADDR_ACK, /* MAC address */
NET_MACADDR_ACK, /* MAC address acknowledge */
};
......@@ -122,9 +126,9 @@ enum net_types {
#ifndef MAX_MACADDR_LEN
#define MAX_MACADDR_LEN 6 /* number of bytes in MAC address */
#endif /* MAX_MACADDR_LEN */
#endif
/* various types of scsi task mgmt commands */
/* Various types of scsi task mgmt commands. */
enum task_mgmt_types {
TASK_MGMT_ABORT_TASK = 1,
TASK_MGMT_BUS_RESET,
......@@ -132,7 +136,7 @@ enum task_mgmt_types {
TASK_MGMT_TARGET_RESET,
};
/* various types of vdisk mgmt commands */
/* Various types of vdisk mgmt commands. */
enum vdisk_mgmt_types {
VDISK_MGMT_ACQUIRE = 1,
VDISK_MGMT_RELEASE,
......@@ -146,7 +150,7 @@ struct phys_info {
#define MIN_NUMSIGNALS 64
/* structs with pragma pack */
/* Structs with pragma pack. */
struct guest_phys_info {
u64 address;
......@@ -156,9 +160,9 @@ struct guest_phys_info {
#define GPI_ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct guest_phys_info))
struct uisscsi_dest {
u32 channel; /* channel == bus number */
u32 id; /* id == target number */
u32 lun; /* lun == logical unit number */
u32 channel; /* channel == bus number */
u32 id; /* id == target number */
u32 lun; /* lun == logical unit number */
} __packed;
struct vhba_wwnn {
......@@ -166,7 +170,8 @@ struct vhba_wwnn {
u32 wwnn2;
} __packed;
/* WARNING: Values stired in this structure must contain maximum counts (not
/*
* WARNING: Values stired in this structure must contain maximum counts (not
* maximum values).
*/
struct vhba_config_max {/* 20 bytes */
......@@ -189,23 +194,24 @@ struct uiscmdrsp_scsi {
* information for each
* fragment
*/
enum dma_data_direction data_dir; /* direction of the data, if any */
enum dma_data_direction data_dir; /* direction of the data, if any */
struct uisscsi_dest vdest; /* identifies the virtual hba, id, */
/* channel, lun to which cmd was sent */
/* Needed to queue the rsp back to cmd originator */
int linuxstat; /* original Linux status used by linux vdisk */
/* Needed to queue the rsp back to cmd originator. */
int linuxstat; /* original Linux status used by Linux vdisk */
u8 scsistat; /* the scsi status */
u8 addlstat; /* non-scsi status */
#define ADDL_SEL_TIMEOUT 4
/* the following fields are need to determine the result of command */
/* The following fields are need to determine the result of command. */
u8 sensebuf[MAX_SENSE_SIZE]; /* sense info in case cmd failed; */
/* it holds the sense_data struct; */
/* see that struct for details. */
void *vdisk; /* pointer to the vdisk to clean up when IO completes. */
/* sensebuf holds the sense_data struct; */
/* See sense_data struct for more details. */
void *vdisk; /* Pointer to the vdisk to clean up when IO completes. */
int no_disk_result;
/* used to return no disk inquiry 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
......@@ -214,35 +220,44 @@ struct uiscmdrsp_scsi {
*/
} __packed;
/* Defines to support sending correct inquiry result when no disk is
/*
* Defines to support sending correct inquiry result when no disk is
* configured.
*/
/* From SCSI SPC2 -
/*
* 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.
* 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.
*/
#define DEV_NOT_CAPABLE 0x7f /* peripheral qualifier of 0x3 */
/* peripheral type of 0x1f */
/* specifies no device but target present */
#define DEV_NOT_CAPABLE 0x7f /*
* peripheral qualifier of 0x3
* peripheral type of 0x1f
* specifies no device but target present
*/
#define DEV_DISK_CAPABLE_NOT_PRESENT 0x20 /* peripheral qualifier of 0x1 */
/* peripheral type of 0 - disk */
/* specifies device capable, but not present */
#define DEV_DISK_CAPABLE_NOT_PRESENT 0x20 /* peripheral qualifier of 0x1
* peripheral type of 0 - disk
* Specifies device capable, but
* not present
*/
#define DEV_HISUPPORT 0x10 /* HiSup = 1; shows support for report luns */
/* must be returned for lun 0. */
#define DEV_HISUPPORT 0x10 /*
* HiSup = 1; shows support for report luns
* must be returned for lun 0.
*/
/* 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
* & revision. Yikes! So let us always send back 36 bytes, the minimum for
/*
* 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
......@@ -250,11 +265,12 @@ struct uiscmdrsp_scsi {
#define MIN_INQUIRY_RESULT_LEN 5 /* 5 bytes minimum for inquiry result */
/* SCSI device version for no disk inquiry result */
#define SCSI_SPC2_VER 4 /* indicates SCSI SPC2 (SPC3 is 5) */
#define SCSI_SPC2_VER 4 /* indicates SCSI SPC2 (SPC3 is 5) */
/* Struct & Defines to support sense information. */
/* Struct and Defines to support sense information. */
/* The following struct is returned in sensebuf field in uiscmdrsp_scsi. It is
/*
* 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:
......@@ -290,7 +306,7 @@ struct net_pkt_xmt {
struct phys_info frags[MAX_PHYS_INFO]; /* physical page information */
char ethhdr[ETH_HEADER_SIZE]; /* the ethernet header */
struct {
/* these are needed for csum at uisnic end */
/* These are needed for csum at uisnic end */
u8 valid; /* 1 = struct is valid - else ignore */
u8 hrawoffv; /* 1 = hwrafoff is valid */
u8 nhrawoffv; /* 1 = nhwrafoff is valid */
......@@ -302,7 +318,8 @@ struct net_pkt_xmt {
/* nhrawoff points to the start of the NETWORK LAYER HEADER */
} lincsum;
/* **** NOTE ****
/*
* 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
......@@ -311,14 +328,15 @@ struct net_pkt_xmt {
} __packed;
struct net_pkt_xmtdone {
u32 xmt_done_result; /* result of NET_XMIT */
u32 xmt_done_result; /* result of NET_XMIT */
} __packed;
/* RCVPOST_BUF_SIZe must be at most page_size(4096) - cache_line_size (64) The
/*
* 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
* virtnic requires that there is "overhead" in the buffer, and pads 16 bytes. I
* prefer to use 1 full cache line size for "overhead" so that transfers are
* better. IOVM requires that a buffer be represented by 1 phys_info structure
* 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
......@@ -326,26 +344,38 @@ struct net_pkt_xmtdone {
((ETH_MAX_MTU + ETH_HEADER_SIZE + 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 {
/* 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 phys_info frag; /* physical page information for the */
/* single fragment 2K rcv buf */
u64 unique_num;
/* unique_num ensure that receive posts are returned to */
/* the Adapter which we sent them originally. */
/* 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;
/*
* The number of rcvbuf that can be chained is based on max mtu and size of each
* rcvbuf.
*/
struct net_pkt_rcv {
/* the number of receive buffers that can be chained */
/* is based on max mtu and size of each rcv buf */
u32 rcv_done_len; /* length of received data */
u8 numrcvbufs; /* number of receive buffers that contain the */
/* incoming data; guest end MUST chain these together. */
void *rcvbuf[MAX_NET_RCV_CHAIN]; /* list of chained rcvbufs */
/* each entry is a receive buffer provided by NET_RCV_POST. */
u32 rcv_done_len; /* length of received data */
/*
* numrcvbufs: contain the incoming data; guest side MUST chain these
* together.
*/
u8 numrcvbufs;
void *rcvbuf[MAX_NET_RCV_CHAIN]; /* list of chained rcvbufs */
/* Each entry is a receive buffer provided by NET_RCV_POST. */
/* NOTE: first rcvbuf in the chain will also be provided in net.buf. */
u64 unique_num;
u32 rcvs_dropped_delta;
......@@ -353,12 +383,12 @@ struct net_pkt_rcv {
struct net_pkt_enbdis {
void *context;
u16 enable; /* 1 = enable, 0 = disable */
u16 enable; /* 1 = enable, 0 = disable */
} __packed;
struct net_pkt_macaddr {
void *context;
u8 macaddr[MAX_MACADDR_LEN]; /* 6 bytes */
u8 macaddr[MAX_MACADDR_LEN]; /* 6 bytes */
} __packed;
/* cmd rsp packet used for VNIC network traffic */
......@@ -379,41 +409,44 @@ struct uiscmdrsp_net {
} __packed;
struct uiscmdrsp_scsitaskmgmt {
/* The type of task. */
enum task_mgmt_types tasktype;
/* the type of task */
/* The vdisk for which this task mgmt is generated. */
struct uisscsi_dest vdest;
/* the vdisk for which this task mgmt is generated */
/*
* 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.
*/
u64 handle;
/* This is a handle that the guest has saved off for its own use.
* Its value is preserved by iopart & returned as is in the task
* mgmt rsp.
*/
/*
* 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.
*/
u64 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. Its value is preserved by iopart & returned
* as is in the task mgmt rsp.
*/
/*
* 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 in
* the task mgmt rsp.
*/
u64 notifyresult_handle;
/* this is a handle to location in guest where the result of the
* taskmgmt command (result field) is to saved off when the response
* is handled. Its value is preserved by iopart & returned as is in
* the task mgmt rsp.
*/
/* Result of taskmgmt command - set by IOPart - values are: */
char result;
/* result of taskmgmt command - set by IOPart - values are: */
#define TASK_MGMT_FAILED 0
} __packed;
/* Used by uissd to send disk add/remove notifications to Guest */
/* Used by uissd to send disk add/remove notifications to Guest. */
/* Note that the vHba pointer is not used by the Client/Guest side. */
struct uiscmdrsp_disknotify {
u8 add; /* 0-remove, 1-add */
......@@ -421,49 +454,52 @@ struct uiscmdrsp_disknotify {
u32 channel, id, lun; /* SCSI Path of Disk to added or removed */
} __packed;
/* The following is used by virthba/vSCSI to send the Acquire/Release commands
/*
* The following is used by virthba/vSCSI to send the Acquire/Release commands
* to the IOVM.
*/
struct uiscmdrsp_vdiskmgmt {
/* The type of task */
enum vdisk_mgmt_types vdisktype;
/* the type of task */
/* The vdisk for which this task mgmt is generated */
struct uisscsi_dest vdest;
/* the vdisk for which this task mgmt is generated */
/*
* This is a handle that the guest has saved off for its own use. It's
* value is preserved by iopart and returned as in the task mgmt rsp.
*/
u64 handle;
/* This is a handle that the guest has saved off for its own use.
* Its value is preserved by iopart & returned as is in the task
* mgmt rsp.
*/
/*
* For Linux guests, this is a pointer to wait_queue_head that a
* thread is waiting on to see if the tskmgmt 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.
*/
u64 notify_handle;
/* For linux guests, this is a pointer to wait_queue_head that a
* thread is waiting on to see if the tskmgmt 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. Its value is preserved by iopart & returned
* as is in the task mgmt rsp.
*/
/*
* Handle to the location in 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 in
* the task mgmt rsp.
*/
u64 notifyresult_handle;
/* this is a handle to location in guest where the result of the
* taskmgmt command (result field) is to saved off when the response
* is handled. Its value is preserved by iopart & returned as is in
* the task mgmt rsp.
*/
/* Result of taskmgmt command - set by IOPart - values are: */
char result;
/* result of taskmgmt command - set by IOPart - values are: */
#define VDISK_MGMT_FAILED 0
} __packed;
/* keeping cmd & rsp info in one structure for now cmd rsp packet for scsi */
/* 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 */
/* Describes what type of information is in the struct */
#define CMD_SCSI_TYPE 1
#define CMD_NET_TYPE 2
#define CMD_SCSITASKMGMT_TYPE 3
......@@ -476,11 +512,11 @@ struct uiscmdrsp {
struct uiscmdrsp_disknotify disknotify;
struct uiscmdrsp_vdiskmgmt vdiskmgmt;
};
void *private_data; /* send the response when the cmd is */
/* done (scsi & scsittaskmgmt). */
/* 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; /* Used to track active commands */
struct uiscmdrsp *activeQ_prev; /* Used to track active commands */
struct uiscmdrsp *activeQ_next; /* Pointer to the nextactive commands */
struct uiscmdrsp *activeQ_prev; /* Pointer to the prevactive commands */
} __packed;
struct iochannel_vhba {
......@@ -493,7 +529,8 @@ struct iochannel_vnic {
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 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.
*/
......@@ -507,31 +544,23 @@ struct spar_io_channel_protocol {
} __packed;
#define MAX_CLIENTSTRING_LEN 1024
/* client_string is NULL termimated so holds max -1 bytes */
/* 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 */
/* INLINE functions for initializing and accessing I/O data channels. */
#define SIZEOF_PROTOCOL (COVER(sizeof(struct spar_io_channel_protocol), 64))
#define SIZEOF_CMDRSP (COVER(sizeof(struct uiscmdrsp), 64))
#define MIN_IO_CHANNEL_SIZE COVER(SIZEOF_PROTOCOL + \
2 * MIN_NUMSIGNALS * SIZEOF_CMDRSP, 4096)
/*
* INLINE function for expanding a guest's pfn-off-size into multiple 4K page
* pfn-off-size entires.
*/
/* use 4K page sizes when we it comes to passing page information between */
/* Guest and IOPartition. */
/* Use 4K page sizes when passing page info between Guest and IOPartition. */
#define PI_PAGE_SIZE 0x1000
#define PI_PAGE_MASK 0x0FFF
/* returns next non-zero index on success or zero on failure (i.e. out of
* room)
*/
static inline u16
/* Returns next non-zero index on success or 0 on failure (i.e. out of room). */
static inline u16
add_physinfo_entries(u64 inp_pfn, u16 inp_off, u32 inp_len, u16 index,
u16 max_pi_arr_entries, struct phys_info pi_arr[])
{
......@@ -540,7 +569,7 @@ add_physinfo_entries(u64 inp_pfn, u16 inp_off, u32 inp_len, u16 index,
firstlen = PI_PAGE_SIZE - inp_off;
if (inp_len <= firstlen) {
/* the input entry spans only one page - add as is */
/* The input entry spans only one page - add as is. */
if (index >= max_pi_arr_entries)
return 0;
pi_arr[index].pi_pfn = inp_pfn;
......@@ -549,7 +578,7 @@ add_physinfo_entries(u64 inp_pfn, u16 inp_off, u32 inp_len, u16 index,
return index + 1;
}
/* this entry spans multiple pages */
/* This entry spans multiple pages. */
for (len = inp_len, i = 0; len;
len -= pi_arr[index + i].pi_len, i++) {
if (index + i >= max_pi_arr_entries)
......@@ -567,4 +596,4 @@ add_physinfo_entries(u64 inp_pfn, u16 inp_off, u32 inp_len, u16 index,
return index + i;
}
#endif /* __IOCHANNEL_H__ */
#endif /* __IOCHANNEL_H__ */
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