ipath_common.h

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/*
 * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef _IPATH_COMMON_H
#define _IPATH_COMMON_H

/*
 * This file contains defines, structures, etc. that are used
 * to communicate between kernel and user code.
 */


/* This is the IEEE-assigned OUI for QLogic Inc. InfiniPath */
#define IPATH_SRC_OUI_1 0x00
#define IPATH_SRC_OUI_2 0x11
#define IPATH_SRC_OUI_3 0x75

/* version of protocol header (known to chip also). In the long run,
 * we should be able to generate and accept a range of version numbers;
 * for now we only accept one, and it's compiled in.
 */
#define IPS_PROTO_VERSION 2

/*
 * These are compile time constants that you may want to enable or disable
 * if you are trying to debug problems with code or performance.
 * IPATH_VERBOSE_TRACING define as 1 if you want additional tracing in
 * fastpath code
 * IPATH_TRACE_REGWRITES define as 1 if you want register writes to be
 * traced in faspath code
 * _IPATH_TRACING define as 0 if you want to remove all tracing in a
 * compilation unit
 * _IPATH_DEBUGGING define as 0 if you want to remove debug prints
 */

/*
 * The value in the BTH QP field that InfiniPath uses to differentiate
 * an infinipath protocol IB packet vs standard IB transport
 */
#define IPATH_KD_QP 0x656b79

/*
 * valid states passed to ipath_set_linkstate() user call
 */
#define IPATH_IB_LINKDOWN		0
#define IPATH_IB_LINKARM		1
#define IPATH_IB_LINKACTIVE		2
#define IPATH_IB_LINKINIT		3
#define IPATH_IB_LINKDOWN_SLEEP		4
#define IPATH_IB_LINKDOWN_DISABLE	5
#define IPATH_IB_LINK_LOOPBACK	6 /* enable local loopback */
#define IPATH_IB_LINK_EXTERNAL	7 /* normal, disable local loopback */

/*
 * stats maintained by the driver.  For now, at least, this is global
 * to all minor devices.
 */
struct infinipath_stats {
	/* number of interrupts taken */
	__u64 sps_ints;
	/* number of interrupts for errors */
	__u64 sps_errints;
	/* number of errors from chip (not incl. packet errors or CRC) */
	__u64 sps_errs;
	/* number of packet errors from chip other than CRC */
	__u64 sps_pkterrs;
	/* number of packets with CRC errors (ICRC and VCRC) */
	__u64 sps_crcerrs;
	/* number of hardware errors reported (parity, etc.) */
	__u64 sps_hwerrs;
	/* number of times IB link changed state unexpectedly */
	__u64 sps_iblink;
	__u64 sps_unused; /* was fastrcvint, no longer implemented */
	/* number of kernel (port0) packets received */
	__u64 sps_port0pkts;
	/* number of "ethernet" packets sent by driver */
	__u64 sps_ether_spkts;
	/* number of "ethernet" packets received by driver */
	__u64 sps_ether_rpkts;
	/* number of SMA packets sent by driver. Obsolete. */
	__u64 sps_sma_spkts;
	/* number of SMA packets received by driver. Obsolete. */
	__u64 sps_sma_rpkts;
	/* number of times all ports rcvhdrq was full and packet dropped */
	__u64 sps_hdrqfull;
	/* number of times all ports egrtid was full and packet dropped */
	__u64 sps_etidfull;
	/*
	 * number of times we tried to send from driver, but no pio buffers
	 * avail
	 */
	__u64 sps_nopiobufs;
	/* number of ports currently open */
	__u64 sps_ports;
	/* list of pkeys (other than default) accepted (0 means not set) */
	__u16 sps_pkeys[4];
	__u16 sps_unused16[4]; /* available; maintaining compatible layout */
	/* number of user ports per chip (not IB ports) */
	__u32 sps_nports;
	/* not our interrupt, or already handled */
	__u32 sps_nullintr;
	/* max number of packets handled per receive call */
	__u32 sps_maxpkts_call;
	/* avg number of packets handled per receive call */
	__u32 sps_avgpkts_call;
	/* total number of pages locked */
	__u64 sps_pagelocks;
	/* total number of pages unlocked */
	__u64 sps_pageunlocks;
	/*
	 * Number of packets dropped in kernel other than errors (ether
	 * packets if ipath not configured, etc.)
	 */
	__u64 sps_krdrops;
	__u64 sps_txeparity; /* PIO buffer parity error, recovered */
	/* pad for future growth */
	__u64 __sps_pad[45];
};

/*
 * These are the status bits readable (in ascii form, 64bit value)
 * from the "status" sysfs file.
 */
#define IPATH_STATUS_INITTED       0x1	/* basic initialization done */
#define IPATH_STATUS_DISABLED      0x2	/* hardware disabled */
/* Device has been disabled via admin request */
#define IPATH_STATUS_ADMIN_DISABLED    0x4
/* Chip has been found and initted */
#define IPATH_STATUS_CHIP_PRESENT 0x20
/* IB link is at ACTIVE, usable for data traffic */
#define IPATH_STATUS_IB_READY     0x40
/* link is configured, LID, MTU, etc. have been set */
#define IPATH_STATUS_IB_CONF      0x80
/* no link established, probably no cable */
#define IPATH_STATUS_IB_NOCABLE  0x100
/* A Fatal hardware error has occurred. */
#define IPATH_STATUS_HWERROR     0x200

/*
 * The list of usermode accessible registers.  Also see Reg_* later in file.
 */
typedef enum _ipath_ureg {
	/* (RO)  DMA RcvHdr to be used next. */
	ur_rcvhdrtail = 0,
	/* (RW)  RcvHdr entry to be processed next by host. */
	ur_rcvhdrhead = 1,
	/* (RO)  Index of next Eager index to use. */
	ur_rcvegrindextail = 2,
	/* (RW)  Eager TID to be processed next */
	ur_rcvegrindexhead = 3,
	/* For internal use only; max register number. */
	_IPATH_UregMax
} ipath_ureg;

/* bit values for spi_runtime_flags */
#define IPATH_RUNTIME_HT	0x1
#define IPATH_RUNTIME_PCIE	0x2
#define IPATH_RUNTIME_FORCE_WC_ORDER	0x4
#define IPATH_RUNTIME_RCVHDR_COPY	0x8
#define IPATH_RUNTIME_MASTER	0x10
/* 0x20 and 0x40 are no longer used, but are reserved for ABI compatibility */
#define IPATH_RUNTIME_FORCE_PIOAVAIL 0x400
#define IPATH_RUNTIME_PIO_REGSWAPPED 0x800

/*
 * This structure is returned by ipath_userinit() immediately after
 * open to get implementation-specific info, and info specific to this
 * instance.
 *
 * This struct must have explict pad fields where type sizes
 * may result in different alignments between 32 and 64 bit
 * programs, since the 64 bit * bit kernel requires the user code
 * to have matching offsets
 */
struct ipath_base_info {
	/* version of hardware, for feature checking. */
	__u32 spi_hw_version;
	/* version of software, for feature checking. */
	__u32 spi_sw_version;
	/* InfiniPath port assigned, goes into sent packets */
	__u16 spi_port;
	__u16 spi_subport;
	/*
	 * IB MTU, packets IB data must be less than this.
	 * The MTU is in bytes, and will be a multiple of 4 bytes.
	 */
	__u32 spi_mtu;
	/*
	 * Size of a PIO buffer.  Any given packet's total size must be less
	 * than this (in words).  Included is the starting control word, so
	 * if 513 is returned, then total pkt size is 512 words or less.
	 */
	__u32 spi_piosize;
	/* size of the TID cache in infinipath, in entries */
	__u32 spi_tidcnt;
	/* size of the TID Eager list in infinipath, in entries */
	__u32 spi_tidegrcnt;
	/* size of a single receive header queue entry in words. */
	__u32 spi_rcvhdrent_size;
	/*
	 * Count of receive header queue entries allocated.
	 * This may be less than the spu_rcvhdrcnt passed in!.
	 */
	__u32 spi_rcvhdr_cnt;

	/* per-chip and other runtime features bitmap (IPATH_RUNTIME_*) */
	__u32 spi_runtime_flags;

	/* address where receive buffer queue is mapped into */
	__u64 spi_rcvhdr_base;

	/* user program. */

	/* base address of eager TID receive buffers. */
	__u64 spi_rcv_egrbufs;

	/* Allocated by initialization code, not by protocol. */

	/*
	 * Size of each TID buffer in host memory, starting at
	 * spi_rcv_egrbufs.  The buffers are virtually contiguous.
	 */
	__u32 spi_rcv_egrbufsize;
	/*
	 * The special QP (queue pair) value that identifies an infinipath
	 * protocol packet from standard IB packets.  More, probably much
	 * more, to be added.
	 */
	__u32 spi_qpair;

	/*
	 * User register base for init code, not to be used directly by
	 * protocol or applications.
	 */
	__u64 __spi_uregbase;
	/*
	 * Maximum buffer size in bytes that can be used in a single TID
	 * entry (assuming the buffer is aligned to this boundary).  This is
	 * the minimum of what the hardware and software support Guaranteed
	 * to be a power of 2.
	 */
	__u32 spi_tid_maxsize;
	/*
	 * alignment of each pio send buffer (byte count
	 * to add to spi_piobufbase to get to second buffer)
	 */
	__u32 spi_pioalign;
	/*
	 * The index of the first pio buffer available to this process;
	 * needed to do lookup in spi_pioavailaddr; not added to
	 * spi_piobufbase.
	 */
	__u32 spi_pioindex;
	 /* number of buffers mapped for this process */
	__u32 spi_piocnt;

	/*
	 * Base address of writeonly pio buffers for this process.
	 * Each buffer has spi_piosize words, and is aligned on spi_pioalign
	 * boundaries.  spi_piocnt buffers are mapped from this address
	 */
	__u64 spi_piobufbase;

	/*
	 * Base address of readonly memory copy of the pioavail registers.
	 * There are 2 bits for each buffer.
	 */
	__u64 spi_pioavailaddr;

	/*
	 * Address where driver updates a copy of the interface and driver
	 * status (IPATH_STATUS_*) as a 64 bit value.  It's followed by a
	 * string indicating hardware error, if there was one.
	 */
	__u64 spi_status;

	/* number of chip ports available to user processes */
	__u32 spi_nports;
	/* unit number of chip we are using */
	__u32 spi_unit;
	/* num bufs in each contiguous set */
	__u32 spi_rcv_egrperchunk;
	/* size in bytes of each contiguous set */
	__u32 spi_rcv_egrchunksize;
	/* total size of mmap to cover full rcvegrbuffers */
	__u32 spi_rcv_egrbuftotlen;
	__u32 spi_filler_for_align;
	/* address of readonly memory copy of the rcvhdrq tail register. */
	__u64 spi_rcvhdr_tailaddr;

	/* shared memory pages for subports if port is shared */
	__u64 spi_subport_uregbase;
	__u64 spi_subport_rcvegrbuf;
	__u64 spi_subport_rcvhdr_base;

	/* shared memory page for hardware port if it is shared */
	__u64 spi_port_uregbase;
	__u64 spi_port_rcvegrbuf;
	__u64 spi_port_rcvhdr_base;
	__u64 spi_port_rcvhdr_tailaddr;

} __attribute__ ((aligned(8)));


/*
 * This version number is given to the driver by the user code during
 * initialization in the spu_userversion field of ipath_user_info, so
 * the driver can check for compatibility with user code.
 *
 * The major version changes when data structures
 * change in an incompatible way.  The driver must be the same or higher
 * for initialization to succeed.  In some cases, a higher version
 * driver will not interoperate with older software, and initialization
 * will return an error.
 */
#define IPATH_USER_SWMAJOR 1

/*
 * Minor version differences are always compatible
 * a within a major version, however if user software is larger
 * than driver software, some new features and/or structure fields
 * may not be implemented; the user code must deal with this if it
 * cares, or it must abort after initialization reports the difference.
 */
#define IPATH_USER_SWMINOR 6

#define IPATH_USER_SWVERSION ((IPATH_USER_SWMAJOR<<16) | IPATH_USER_SWMINOR)

#define IPATH_KERN_TYPE 0

/*
 * Similarly, this is the kernel version going back to the user.  It's
 * slightly different, in that we want to tell if the driver was built as
 * part of a QLogic release, or from the driver from openfabrics.org,
 * kernel.org, or a standard distribution, for support reasons.
 * The high bit is 0 for non-QLogic and 1 for QLogic-built/supplied.
 *
 * It's returned by the driver to the user code during initialization in the
 * spi_sw_version field of ipath_base_info, so the user code can in turn
 * check for compatibility with the kernel.
*/
#define IPATH_KERN_SWVERSION ((IPATH_KERN_TYPE<<31) | IPATH_USER_SWVERSION)

/*
 * This structure is passed to ipath_userinit() to tell the driver where
 * user code buffers are, sizes, etc.   The offsets and sizes of the
 * fields must remain unchanged, for binary compatibility.  It can
 * be extended, if userversion is changed so user code can tell, if needed
 */
struct ipath_user_info {
	/*
	 * version of user software, to detect compatibility issues.
	 * Should be set to IPATH_USER_SWVERSION.
	 */
	__u32 spu_userversion;

	/* desired number of receive header queue entries */
	__u32 spu_rcvhdrcnt;

	/* size of struct base_info to write to */
	__u32 spu_base_info_size;

	/*