f7241cceb0
Make CTL core and block backend set success status before initiating last data move for read commands. Make CAM target and iSCSI frontends detect such condition and send command status together with data. New I/O flag allows to skip duplicate status sending on later fe_done() call. For Fibre Channel this change saves one of three interrupts per read command, increasing performance from 126K to 160K IOPS. For iSCSI this change saves one of three PDUs per read command, increasing performance from 1M to 1.2M IOPS. MFC after: 1 month Sponsored by: iXsystems, Inc.
527 lines
16 KiB
C
527 lines
16 KiB
C
/*-
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* Copyright (c) 2003 Silicon Graphics International Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*
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* $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_io.h#5 $
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* $FreeBSD$
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*/
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/*
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* CAM Target Layer data movement structures/interface.
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*
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* Author: Ken Merry <ken@FreeBSD.org>
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*/
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#ifndef _CTL_IO_H_
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#define _CTL_IO_H_
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#ifdef _CTL_C
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#define EXTERN(__var,__val) __var = __val
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#else
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#define EXTERN(__var,__val) extern __var
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#endif
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#define CTL_MAX_CDBLEN 32
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/*
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* Uncomment this next line to enable printing out times for I/Os
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* that take longer than CTL_TIME_IO_SECS seconds to get to the datamove
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* and/or done stage.
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*/
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#define CTL_TIME_IO
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#ifdef CTL_TIME_IO
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#define CTL_TIME_IO_DEFAULT_SECS 90
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EXTERN(int ctl_time_io_secs, CTL_TIME_IO_DEFAULT_SECS);
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#endif
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/*
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* Uncomment these next two lines to enable the CTL I/O delay feature. You
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* can delay I/O at two different points -- datamove and done. This is
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* useful for diagnosing abort conditions (for hosts that send an abort on a
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* timeout), and for determining how long a host's timeout is.
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*/
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#define CTL_IO_DELAY
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#define CTL_TIMER_BYTES sizeof(struct callout)
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typedef enum {
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CTL_STATUS_NONE, /* No status */
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CTL_SUCCESS, /* Transaction completed successfully */
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CTL_CMD_TIMEOUT, /* Command timed out, shouldn't happen here */
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CTL_SEL_TIMEOUT, /* Selection timeout, shouldn't happen here */
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CTL_ERROR, /* General CTL error XXX expand on this? */
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CTL_SCSI_ERROR, /* SCSI error, look at status byte/sense data */
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CTL_CMD_ABORTED, /* Command aborted, don't return status */
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CTL_STATUS_MASK = 0xfff,/* Mask off any status flags */
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CTL_AUTOSENSE = 0x1000 /* Autosense performed */
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} ctl_io_status;
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/*
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* WARNING: Keep the data in/out/none flags where they are. They're used
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* in conjuction with ctl_cmd_flags. See comment above ctl_cmd_flags
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* definition in ctl_private.h.
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*/
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typedef enum {
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CTL_FLAG_NONE = 0x00000000, /* no flags */
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CTL_FLAG_DATA_IN = 0x00000001, /* DATA IN */
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CTL_FLAG_DATA_OUT = 0x00000002, /* DATA OUT */
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CTL_FLAG_DATA_NONE = 0x00000003, /* no data */
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CTL_FLAG_DATA_MASK = 0x00000003,
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CTL_FLAG_KDPTR_SGLIST = 0x00000008, /* kern_data_ptr is S/G list*/
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CTL_FLAG_EDPTR_SGLIST = 0x00000010, /* ext_data_ptr is S/G list */
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CTL_FLAG_DO_AUTOSENSE = 0x00000020, /* grab sense info */
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CTL_FLAG_USER_REQ = 0x00000040, /* request came from userland */
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CTL_FLAG_CONTROL_DEV = 0x00000080, /* processor device */
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CTL_FLAG_ALLOCATED = 0x00000100, /* data space allocated */
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CTL_FLAG_BLOCKED = 0x00000200, /* on the blocked queue */
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CTL_FLAG_ABORT_STATUS = 0x00000400, /* return TASK ABORTED status */
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CTL_FLAG_ABORT = 0x00000800, /* this I/O should be aborted */
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CTL_FLAG_DMA_INPROG = 0x00001000, /* DMA in progress */
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CTL_FLAG_NO_DATASYNC = 0x00002000, /* don't cache flush data */
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CTL_FLAG_DELAY_DONE = 0x00004000, /* delay injection done */
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CTL_FLAG_INT_COPY = 0x00008000, /* internal copy, no done call*/
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CTL_FLAG_SENT_2OTHER_SC = 0x00010000,
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CTL_FLAG_FROM_OTHER_SC = 0x00020000,
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CTL_FLAG_IS_WAS_ON_RTR = 0x00040000, /* Don't rerun cmd on failover*/
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CTL_FLAG_BUS_ADDR = 0x00080000, /* ctl_sglist contains BUS
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addresses, not virtual ones*/
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CTL_FLAG_IO_CONT = 0x00100000, /* Continue I/O instead of
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completing */
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CTL_FLAG_AUTO_MIRROR = 0x00200000, /* Automatically use memory
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from the RC cache mirrored
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address area. */
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#if 0
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CTL_FLAG_ALREADY_DONE = 0x00200000 /* I/O already completed */
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#endif
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CTL_FLAG_NO_DATAMOVE = 0x00400000,
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CTL_FLAG_DMA_QUEUED = 0x00800000, /* DMA queued but not started*/
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CTL_FLAG_STATUS_QUEUED = 0x01000000, /* Status queued but not sent*/
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CTL_FLAG_REDIR_DONE = 0x02000000, /* Redirection has already
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been done. */
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CTL_FLAG_FAILOVER = 0x04000000, /* Killed by a failover */
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CTL_FLAG_IO_ACTIVE = 0x08000000, /* I/O active on this SC */
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CTL_FLAG_RDMA_MASK = CTL_FLAG_NO_DATASYNC | CTL_FLAG_BUS_ADDR |
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CTL_FLAG_AUTO_MIRROR | CTL_FLAG_REDIR_DONE,
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/* Flags we care about for
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remote DMA */
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CTL_FLAG_STATUS_SENT = 0x10000000 /* Status sent by datamove */
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} ctl_io_flags;
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struct ctl_lba_len {
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uint64_t lba;
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uint32_t len;
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};
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struct ctl_lba_len_flags {
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uint64_t lba;
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uint32_t len;
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uint32_t flags;
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#define CTL_LLF_FUA 0x04000000
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#define CTL_LLF_DPO 0x08000000
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#define CTL_LLF_READ 0x10000000
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#define CTL_LLF_WRITE 0x20000000
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#define CTL_LLF_VERIFY 0x40000000
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#define CTL_LLF_COMPARE 0x80000000
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};
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struct ctl_ptr_len_flags {
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uint8_t *ptr;
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uint32_t len;
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uint32_t flags;
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};
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union ctl_priv {
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uint8_t bytes[sizeof(uint64_t) * 2];
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uint64_t integer;
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void *ptr;
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};
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/*
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* Number of CTL private areas.
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*/
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#define CTL_NUM_PRIV 6
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/*
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* Which private area are we using for a particular piece of data?
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*/
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#define CTL_PRIV_LUN 0 /* CTL LUN pointer goes here */
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#define CTL_PRIV_LBA_LEN 1 /* Decoded LBA/len for read/write*/
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#define CTL_PRIV_MODEPAGE 1 /* Modepage info for config write */
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#define CTL_PRIV_BACKEND 2 /* Reserved for block, RAIDCore */
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#define CTL_PRIV_BACKEND_LUN 3 /* Backend LUN pointer */
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#define CTL_PRIV_FRONTEND 4 /* LSI driver, ioctl front end */
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#define CTL_PRIV_USER 5 /* Userland use */
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#define CTL_INVALID_PORTNAME 0xFF
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#define CTL_UNMAPPED_IID 0xFF
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/*
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* XXX KDM this size is for the port_priv variable in struct ctl_io_hdr
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* below. This should be defined in terms of the size of struct
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* ctlfe_lun_cmd_info at the moment:
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* struct ctlfe_lun_cmd_info {
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* int cur_transfer_index;
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* ctlfe_cmd_flags flags;
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* bus_dma_segment_t cam_sglist[32];
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* };
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*
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* This isn't really the way I'd prefer to do it, but it does make some
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* sense, AS LONG AS we can guarantee that there will always only be one
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* outstanding DMA request per ctl_io. If that assumption isn't valid,
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* then we've got problems.
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*
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* At some point it may be nice switch CTL over to using CCBs for
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* everything. At that point we can probably use the ATIO/CTIO model, so
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* that multiple simultaneous DMAs per command will just work.
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*
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* Also note that the current size, 600, is appropriate for 64-bit
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* architectures, but is overkill for 32-bit architectures. Need a way to
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* figure out the size at compile time, or just get rid of this altogether.
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*/
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#define CTL_PORT_PRIV_SIZE 600
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struct ctl_sg_entry {
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void *addr;
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size_t len;
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};
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struct ctl_id {
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uint32_t id;
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uint64_t wwid[2];
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};
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typedef enum {
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CTL_IO_NONE,
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CTL_IO_SCSI,
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CTL_IO_TASK,
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} ctl_io_type;
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struct ctl_nexus {
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struct ctl_id initid; /* Initiator ID */
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uint32_t targ_port; /* Target port, filled in by PORT */
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struct ctl_id targ_target; /* Destination target */
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uint32_t targ_lun; /* Destination lun */
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uint32_t targ_mapped_lun; /* Destination lun CTL-wide */
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};
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typedef enum {
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CTL_MSG_SERIALIZE,
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CTL_MSG_R2R,
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CTL_MSG_FINISH_IO,
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CTL_MSG_BAD_JUJU,
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CTL_MSG_MANAGE_TASKS,
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CTL_MSG_PERS_ACTION,
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CTL_MSG_SYNC_FE,
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CTL_MSG_DATAMOVE,
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CTL_MSG_DATAMOVE_DONE
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} ctl_msg_type;
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struct ctl_scsiio;
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#define CTL_NUM_SG_ENTRIES 9
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struct ctl_io_hdr {
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uint32_t version; /* interface version XXX */
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ctl_io_type io_type; /* task I/O, SCSI I/O, etc. */
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ctl_msg_type msg_type;
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struct ctl_nexus nexus; /* Initiator, port, target, lun */
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uint32_t iid_indx; /* the index into the iid mapping */
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uint32_t flags; /* transaction flags */
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uint32_t status; /* transaction status */
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uint32_t port_status; /* trans status, set by PORT, 0 = good*/
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uint32_t timeout; /* timeout in ms */
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uint32_t retries; /* retry count */
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#ifdef CTL_IO_DELAY
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uint8_t timer_bytes[CTL_TIMER_BYTES]; /* timer kludge */
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#endif /* CTL_IO_DELAY */
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#ifdef CTL_TIME_IO
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time_t start_time; /* I/O start time */
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struct bintime start_bt; /* Timer start ticks */
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struct bintime dma_start_bt; /* DMA start ticks */
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struct bintime dma_bt; /* DMA total ticks */
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uint32_t num_dmas; /* Number of DMAs */
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#endif /* CTL_TIME_IO */
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union ctl_io *original_sc;
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union ctl_io *serializing_sc;
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void *pool; /* I/O pool */
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union ctl_priv ctl_private[CTL_NUM_PRIV];/* CTL private area */
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uint8_t port_priv[CTL_PORT_PRIV_SIZE];/* PORT private area*/
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struct ctl_sg_entry remote_sglist[CTL_NUM_SG_ENTRIES];
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struct ctl_sg_entry remote_dma_sglist[CTL_NUM_SG_ENTRIES];
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struct ctl_sg_entry local_sglist[CTL_NUM_SG_ENTRIES];
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struct ctl_sg_entry local_dma_sglist[CTL_NUM_SG_ENTRIES];
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STAILQ_ENTRY(ctl_io_hdr) links; /* linked list pointer */
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TAILQ_ENTRY(ctl_io_hdr) ooa_links;
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TAILQ_ENTRY(ctl_io_hdr) blocked_links;
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};
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typedef enum {
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CTL_TAG_UNTAGGED,
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CTL_TAG_SIMPLE,
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CTL_TAG_ORDERED,
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CTL_TAG_HEAD_OF_QUEUE,
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CTL_TAG_ACA
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} ctl_tag_type;
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union ctl_io;
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/*
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* SCSI passthrough I/O structure for the CAM Target Layer. Note
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* that some of these fields are here for completeness, but they aren't
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* used in the CTL implementation. e.g., timeout and retries won't be
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* used.
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*
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* Note: Make sure the io_hdr is *always* the first element in this
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* structure.
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*/
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struct ctl_scsiio {
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struct ctl_io_hdr io_hdr; /* common to all I/O types */
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/*
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* The ext_* fields are generally intended for frontend use; CTL itself
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* doesn't modify or use them.
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*/
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uint32_t ext_sg_entries; /* 0 = no S/G list, > 0 = num entries */
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uint8_t *ext_data_ptr; /* data buffer or S/G list */
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uint32_t ext_data_len; /* Data transfer length */
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uint32_t ext_data_filled; /* Amount of data filled so far */
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/*
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* The number of scatter/gather entries in the list pointed to
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* by kern_data_ptr. 0 means there is no list, just a data pointer.
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*/
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uint32_t kern_sg_entries;
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uint32_t rem_sg_entries; /* Unused. */
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/*
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* The data pointer or a pointer to the scatter/gather list.
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*/
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uint8_t *kern_data_ptr;
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/*
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* Length of the data buffer or scatter/gather list. It's also
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* the length of this particular piece of the data transfer,
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* ie. number of bytes expected to be transferred by the current
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* invocation of frontend's datamove() callback. It's always
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* less than or equal to kern_total_len.
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*/
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uint32_t kern_data_len;
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/*
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* Total length of data to be transferred during this particular
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* SCSI command, as decoded from SCSI CDB.
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*/
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uint32_t kern_total_len;
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/*
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* Amount of data left after the current data transfer.
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*/
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uint32_t kern_data_resid;
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/*
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* Byte offset of this transfer, equal to the amount of data
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* already transferred for this SCSI command during previous
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* datamove() invocations.
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*/
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uint32_t kern_rel_offset;
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struct scsi_sense_data sense_data; /* sense data */
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uint8_t sense_len; /* Returned sense length */
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uint8_t scsi_status; /* SCSI status byte */
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uint8_t sense_residual; /* Unused. */
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uint32_t residual; /* data residual length */
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uint32_t tag_num; /* tag number */
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ctl_tag_type tag_type; /* simple, ordered, head of queue,etc.*/
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uint8_t cdb_len; /* CDB length */
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uint8_t cdb[CTL_MAX_CDBLEN]; /* CDB */
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int (*be_move_done)(union ctl_io *io); /* called by fe */
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int (*io_cont)(union ctl_io *io); /* to continue processing */
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};
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typedef enum {
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CTL_TASK_ABORT_TASK,
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CTL_TASK_ABORT_TASK_SET,
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CTL_TASK_CLEAR_ACA,
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CTL_TASK_CLEAR_TASK_SET,
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CTL_TASK_I_T_NEXUS_RESET,
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CTL_TASK_LUN_RESET,
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CTL_TASK_TARGET_RESET,
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CTL_TASK_BUS_RESET,
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CTL_TASK_PORT_LOGIN,
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CTL_TASK_PORT_LOGOUT
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} ctl_task_type;
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/*
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* Task management I/O structure. Aborts, bus resets, etc., are sent using
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* this structure.
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*
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* Note: Make sure the io_hdr is *always* the first element in this
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* structure.
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*/
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struct ctl_taskio {
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struct ctl_io_hdr io_hdr; /* common to all I/O types */
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ctl_task_type task_action; /* Target Reset, Abort, etc. */
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uint32_t tag_num; /* tag number */
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ctl_tag_type tag_type; /* simple, ordered, etc. */
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};
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typedef enum {
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CTL_PR_REG_KEY,
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CTL_PR_UNREG_KEY,
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CTL_PR_PREEMPT,
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CTL_PR_CLEAR,
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CTL_PR_RESERVE,
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CTL_PR_RELEASE
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} ctl_pr_action;
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/*
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* The PR info is specifically for sending Persistent Reserve actions
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* to the other SC which it must also act on.
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*
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* Note: Make sure the io_hdr is *always* the first element in this
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* structure.
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*/
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struct ctl_pr_info {
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ctl_pr_action action;
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uint8_t sa_res_key[8];
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uint8_t res_type;
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uint32_t residx;
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};
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struct ctl_ha_msg_hdr {
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ctl_msg_type msg_type;
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union ctl_io *original_sc;
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union ctl_io *serializing_sc;
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struct ctl_nexus nexus; /* Initiator, port, target, lun */
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uint32_t status; /* transaction status */
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TAILQ_ENTRY(ctl_ha_msg_hdr) links;
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};
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#define CTL_HA_MAX_SG_ENTRIES 16
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/*
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* Used for CTL_MSG_PERS_ACTION.
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*/
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struct ctl_ha_msg_pr {
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struct ctl_ha_msg_hdr hdr;
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struct ctl_pr_info pr_info;
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};
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/*
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* The S/G handling here is a little different than the standard ctl_scsiio
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* structure, because we can't pass data by reference in between controllers.
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* The S/G list in the ctl_scsiio struct is normally passed in the
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* kern_data_ptr field. So kern_sg_entries here will always be non-zero,
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* even if there is only one entry.
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*
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* Used for CTL_MSG_DATAMOVE.
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*/
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struct ctl_ha_msg_dt {
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struct ctl_ha_msg_hdr hdr;
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ctl_io_flags flags; /* Only I/O flags are used here */
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uint32_t sg_sequence; /* S/G portion number */
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uint8_t sg_last; /* last S/G batch = 1 */
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uint32_t sent_sg_entries; /* previous S/G count */
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uint32_t cur_sg_entries; /* current S/G entries */
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uint32_t kern_sg_entries; /* total S/G entries */
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uint32_t kern_data_len; /* Length of this S/G list */
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uint32_t kern_total_len; /* Total length of this
|
|
transaction */
|
|
uint32_t kern_data_resid; /* Length left to transfer
|
|
after this*/
|
|
uint32_t kern_rel_offset; /* Byte Offset of this
|
|
transfer */
|
|
struct ctl_sg_entry sg_list[CTL_HA_MAX_SG_ENTRIES];
|
|
};
|
|
|
|
/*
|
|
* Used for CTL_MSG_SERIALIZE, CTL_MSG_FINISH_IO, CTL_MSG_BAD_JUJU.
|
|
*/
|
|
struct ctl_ha_msg_scsi {
|
|
struct ctl_ha_msg_hdr hdr;
|
|
uint8_t cdb[CTL_MAX_CDBLEN]; /* CDB */
|
|
uint32_t tag_num; /* tag number */
|
|
ctl_tag_type tag_type; /* simple, ordered, etc. */
|
|
uint8_t scsi_status; /* SCSI status byte */
|
|
struct scsi_sense_data sense_data; /* sense data */
|
|
uint8_t sense_len; /* Returned sense length */
|
|
uint8_t sense_residual; /* sense residual length */
|
|
uint32_t residual; /* data residual length */
|
|
uint32_t fetd_status; /* trans status, set by FETD,
|
|
0 = good*/
|
|
struct ctl_lba_len lbalen; /* used for stats */
|
|
};
|
|
|
|
/*
|
|
* Used for CTL_MSG_MANAGE_TASKS.
|
|
*/
|
|
struct ctl_ha_msg_task {
|
|
struct ctl_ha_msg_hdr hdr;
|
|
ctl_task_type task_action; /* Target Reset, Abort, etc. */
|
|
uint32_t tag_num; /* tag number */
|
|
ctl_tag_type tag_type; /* simple, ordered, etc. */
|
|
};
|
|
|
|
union ctl_ha_msg {
|
|
struct ctl_ha_msg_hdr hdr;
|
|
struct ctl_ha_msg_task task;
|
|
struct ctl_ha_msg_scsi scsi;
|
|
struct ctl_ha_msg_dt dt;
|
|
struct ctl_ha_msg_pr pr;
|
|
};
|
|
|
|
|
|
struct ctl_prio {
|
|
struct ctl_io_hdr io_hdr;
|
|
struct ctl_ha_msg_pr pr_msg;
|
|
};
|
|
|
|
|
|
|
|
union ctl_io {
|
|
struct ctl_io_hdr io_hdr; /* common to all I/O types */
|
|
struct ctl_scsiio scsiio; /* Normal SCSI commands */
|
|
struct ctl_taskio taskio; /* SCSI task management/reset */
|
|
struct ctl_prio presio; /* update per. res info on other SC */
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
|
|
union ctl_io *ctl_alloc_io(void *pool_ref);
|
|
union ctl_io *ctl_alloc_io_nowait(void *pool_ref);
|
|
void ctl_free_io(union ctl_io *io);
|
|
void ctl_zero_io(union ctl_io *io);
|
|
void ctl_copy_io(union ctl_io *src, union ctl_io *dest);
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* _CTL_IO_H_ */
|
|
|
|
/*
|
|
* vim: ts=8
|
|
*/
|