RE: [PATCH] drivers/scsi/emcctd: drivers/scsi/emcctd: Client driver implementation for EMC-Symmetrix GuestOS emulated Cut-Through Device

From: Singhal, Maneesh
Date: Sat Jan 23 2016 - 00:52:32 EST

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Thanks for your time. My replies inlined...

> -----Original Message-----
> From: Johannes Thumshirn [mailto:jthumshirn@xxxxxxx]
> Sent: Tuesday, January 19, 2016 9:34 PM
> To: Singhal, Maneesh
> Cc: linux-scsi@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> JBottomley@xxxxxxxx; martin.petersen@xxxxxxxxxx; linux-
> api@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH] drivers/scsi/emcctd: drivers/scsi/emcctd: Client
> driver implementation for EMC-Symmetrix GuestOS emulated Cut-
> Through Device
>
> On Tue, Jan 19, 2016 at 11:58:06AM +0000, Singhal, Maneesh wrote:
> > Hello,
> > Kindly review the following patch for the following driver to be
> added in SCSI subsystem -
> >
> > Regards
> > Maneesh
> >
> > ----------------------------------------------------------------------------
> > From f3c4b836d6f130b1d7ded618002c8164f8f4a06d Mon Sep 17
> 00:00:00 2001
> > From: "maneesh.singhal" <maneesh.singhal@xxxxxxx>
> > Date: Tue, 19 Jan 2016 06:39:35 -0500
> > Subject: [PATCH] [PATCH] drivers/scsi/emcctd: Client driver
> implementation for
> > EMC-Symmetrix GuestOS emulated Cut-Through Device.
> >
> > The patch is a driver implementation EMC-Symmetrix GuestOS
> emulated Cut-Through
> > Device. The Cut-Through Device PCI emulation is implemented for
> GuestOS
> > environments in the HyperMax OS. GuestOS environments allows
> loading of
> > any x86 compliant operating systems like Linux/FreeBSD etc.
> >
> > The client driver is a SCSI HBA implementation which interfaces with
> SCSI
> > midlayer in the north-bound interfaces and connects with the
> emulated PCI device
> > on the south side.
> >
> > The PCI vendor ID:product ID for emulated Cut-Through Device is
> 0x1120:0x1B00.
> >
> > Signed-off-by: maneesh.singhal <maneesh.singhal@xxxxxxx>
> > ---
> > Documentation/scsi/emcctd.txt | 57 +
> > MAINTAINERS | 9 +
> > drivers/scsi/Kconfig | 1 +
> > drivers/scsi/Makefile | 1 +
> > drivers/scsi/emcctd/Kconfig | 7 +
> > drivers/scsi/emcctd/Makefile | 1 +
> > drivers/scsi/emcctd/README | 10 +
> > drivers/scsi/emcctd/emc_ctd_interface.h | 386 +++++
> > drivers/scsi/emcctd/emcctd.c | 2840
> +++++++++++++++++++++++++++++++
> > drivers/scsi/emcctd/emcctd.h | 232 +++
> > 10 files changed, 3544 insertions(+)
> > create mode 100644 Documentation/scsi/emcctd.txt
> > create mode 100644 drivers/scsi/emcctd/Kconfig
> > create mode 100644 drivers/scsi/emcctd/Makefile
> > create mode 100644 drivers/scsi/emcctd/README
> > create mode 100644 drivers/scsi/emcctd/emc_ctd_interface.h
> > create mode 100644 drivers/scsi/emcctd/emcctd.c
> > create mode 100644 drivers/scsi/emcctd/emcctd.h
> >
> > diff --git a/Documentation/scsi/emcctd.txt
> b/Documentation/scsi/emcctd.txt
> > new file mode 100644
> > index 0000000..bcafc87
> > --- /dev/null
> > +++ b/Documentation/scsi/emcctd.txt
> > @@ -0,0 +1,56 @@
> > +This file contains brief information about the EMC Cut-Through
> Driver (emcctd).
> > +The driver is currently maintained by Singhal, Maneesh
> (maneesh.singhal@xxxxxxx)
> > +
> > +Last modified: Mon Jan 18 2016 by Maneesh Singhal
> > +
> > +BASICS
> > +
> > +Its a client driver implementation for EMC-Symmetrix GuestOS
> emulated
> > +Cut-Through Device. The Cut-Through Device PCI emulation is
> implemented for
> > +GuestOS environments in the HyperMax OS. GuestOS
> environments allows loading of
> > +any x86 compliant operating systems like Linux/FreeBSD etc.
> > +
> > +The client driver is a SCSI HBA implementation which interfaces with
> SCSI
> > +midlayer in the north-bound interfaces and connects with the
> emulated PCI device
> > +on the south side.
> > +
> > +The PCI vendor ID:product ID for emulated Cut-Through Device is
> 0x1120:0x1B00.
> > +
> > +VERSIONING
> > +
> > +The Version of the driver is maintained as 2.0.0.X, where 2 refers to
> the CTD
> > +protocol in use, and X refers to the ongoing version of the driver.
> > +
> > +
> > +SYSFS SUPPORT
> > +
> > +The driver creates the directory /sys/module/emcctd and
> populates it with
> > +version file and a directory for various parameters as described in
> MODULE
> > +PARAMETERS section.
> > +
> > +PROCFS SUPPORT
> > +
> > +The driver creates the directory /proc/emc and creates files
> emcctd_stats_x
> > +where 'x' refers to the PCI emulation number this client driver
> connected to.
> > +These files cotains WWN information and IO statistics for the
> particular PCI
> > +emulation.
> > +
> > +MODULE PARAMETERS
> > +
> > +The supported parameters which could add debuggability or change
> the runtime
> > +behavior of the driver are as following:
> > +
> > +ctd_debug=0 | 1 Enable driver debug messages(0=off,
> 1=on)
> > +
> > +max_luns=xx Specify the maximum number of LUN's
> per
> > + host(default=16384)
> > +
> > +cmd_per_lun=xx Specify the maximum commands per
> lun(default=16)
> > +
> > +DEBUGGING HINTS
> > +
> > +Debugging code is now compiled in by default but debugging is
> turned off
> > +with the kernel module parameter debug_flag defaulting to 0. To
> enable debug at
> > +module load time add ctd_debug=1 to the module load options.
> > +Debugging can also be enabled and disabled by writing a '0' (disable)
> or '1'
> > +(enable) to the sysfs file
> /sys/module/emcctd/parameters/ctd_debug
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 1d23f70..671173a 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -6601,6 +6601,15 @@ F: drivers/message/fusion/
> > F: drivers/scsi/mpt2sas/
> > F: drivers/scsi/mpt3sas/
> >
> > +EMC Cut-Through Driver
> > +M: fredette, matt <matt.fredette@xxxxxxx>
> > +M: Pirotte, Serge <serge.pirotte@xxxxxxx>
> > +M: Singh Animesh <Animesh.Singh@xxxxxxx>
> > +M: Singhal, Maneesh <Maneesh.Singhal@xxxxxxx>
> > +L: linux-scsi@xxxxxxxxxxxxxxx
> > +S: Maintained
> > +F: drivers/scsis/emcctd/
> > +
> > LSILOGIC/SYMBIOS/NCR 53C8XX and 53C1010 PCI-SCSI drivers
> > M: Matthew Wilcox <matthew@xxxxxx>
> > L: linux-scsi@xxxxxxxxxxxxxxx
> > diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
> > index c1fe0d2..cbc03d7 100644
> > --- a/drivers/scsi/Kconfig
> > +++ b/drivers/scsi/Kconfig
> > @@ -477,6 +477,7 @@ source "drivers/scsi/aic7xxx/Kconfig.aic79xx"
> > source "drivers/scsi/aic94xx/Kconfig"
> > source "drivers/scsi/hisi_sas/Kconfig"
> > source "drivers/scsi/mvsas/Kconfig"
> > +source "drivers/scsi/emcctd/Kconfig"
> >
> > config SCSI_MVUMI
> > tristate "Marvell UMI driver"
> > diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
> > index 862ab4e..55bea65 100644
> > --- a/drivers/scsi/Makefile
> > +++ b/drivers/scsi/Makefile
> > @@ -132,6 +132,7 @@ obj-$(CONFIG_SCSI_IBMVFC) += ibmvscsi/
> > obj-$(CONFIG_SCSI_HPTIOP) += hptiop.o
> > obj-$(CONFIG_SCSI_STEX) += stex.o
> > obj-$(CONFIG_SCSI_MVSAS) += mvsas/
> > +obj-$(CONFIG_SCSI_EMCCTD) += emcctd/
> > obj-$(CONFIG_SCSI_MVUMI) += mvumi.o
> > obj-$(CONFIG_PS3_ROM) += ps3rom.o
> > obj-$(CONFIG_SCSI_CXGB3_ISCSI) += libiscsi.o libiscsi_tcp.o cxgbi/
> > diff --git a/drivers/scsi/emcctd/Kconfig
> b/drivers/scsi/emcctd/Kconfig
> > new file mode 100644
> > index 0000000..d995b53
> > --- /dev/null
> > +++ b/drivers/scsi/emcctd/Kconfig
> > @@ -0,0 +1,7 @@
> > +config SCSI_EMCCTD
> > + tristate "EMC Cut-Through client driver"
> > + depends on SCSI && PCI && X86
> > + help
> > + This driver supports EMC virtual PCI Cut-Through-
> Device.
> > + To compile this driver as a module, choose M here: the
> > + module will be called emcctd.
> > diff --git a/drivers/scsi/emcctd/Makefile
> b/drivers/scsi/emcctd/Makefile
> > new file mode 100644
> > index 0000000..74a070e
> > --- /dev/null
> > +++ b/drivers/scsi/emcctd/Makefile
> > @@ -0,0 +1 @@
> > +obj-$(CONFIG_SCSI_EMCCTD) += emcctd.o
> > diff --git a/drivers/scsi/emcctd/README
> b/drivers/scsi/emcctd/README
> > new file mode 100644
> > index 0000000..496ce7f
> > --- /dev/null
> > +++ b/drivers/scsi/emcctd/README
> > @@ -0,0 +1,10 @@
> > +EMCCTD : Client driver implementation for EMC-Symmetrix
> GuestOS emulated
> > +Cut-Through Device. The Cut-Through Device PCI emulation is
> implemented for
> > +GuestOS environments in the HyperMax OS. GuestOS
> environments allows loading of
> > +any x86 compliant operating systems like Linux/FreeBSD etc.
> > +
> > +The client driver is a SCSI HBA implementation which interfaces with
> SCSI
> > +midlayer in the north-bound interfaces and connects with the
> emulated PCI device
> > +on the south side.
> > +
> > +The PCI vendor ID:product ID for emulated Cut-Through Device is
> 0x1120:0x1B00.
> > diff --git a/drivers/scsi/emcctd/emc_ctd_interface.h
> b/drivers/scsi/emcctd/emc_ctd_interface.h
> > new file mode 100644
> > index 0000000..58a0276
> > --- /dev/null
> > +++ b/drivers/scsi/emcctd/emc_ctd_interface.h
> > @@ -0,0 +1,386 @@
> > +/*
> > + * EMCCTD: EMC Cut-Through HBA Driver for SCSI subsystem.
> > + *
> > + * Copyright (C) 2015 by EMC Corporation, Hopkinton, MA.
> > + *
> > + * Authors:
> > + * fredette, matt <matt.fredette@xxxxxxx>
> > + * Pirotte, Serge <serge.pirotte@xxxxxxx>
> > + * Singh Animesh <Animesh.Singh@xxxxxxx>
> > + * Singhal, Maneesh <Maneesh.Singhal@xxxxxxx>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License
> > + * as published by the Free Software Foundation; either version 2
> > + * of the License, or (at your option) any later version.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied
> warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
> the
> > + * GNU General Public License for more details.
> > + *
> > + */
> > +
> > +#ifndef _EMC_CTD_INTERFACE_H
> > +#define _EMC_CTD_INTERFACE_H
> > +/*
> > + *
> > + * DESCRIPTION: Data structures used by the Cut-through
> subsystem.
> > + *
> > + * NOTES: Changes to any of these structures will mean that any
> Clients that
> > + * depend on them will also need to be modified. Since many of
> those
> > + * Clients are not part of the Enginuity build process, this will
> almost
> > + * certainly require new versions of Guest OS CTD Client code to
> be
> > + * released.
> > + *
> > + * Before modifying any data structures in this file please discuss
> the
> > + * change with the maintainers.
> > + *
> > + */
> > +
> > +
> > +/* macros: */
> > +
> > +/* the PCI vendor ID for all devices: */
> > +#define EMC_CTD_PCI_VENDOR
> (0x1120)
> > +
> > +/* the PCI product ID for all version 1.x devices: */
> > +#define EMC_CTD_V010_PCI_PRODUCT
> (0x1b00)
> > +
> > +/* the PCI revision ID for the first version 1.0 device: */
> > +#define EMC_CTD_V010_PCI_REVISION (1)
> > +
> > +/* the 64-bit BAR pair for the transmit and receive rings: */
> > +#define EMC_CTD_V010_BAR_RINGS
> (0)
> > +
> > +/* the 64-bit BAR pair for the fast registers: */
> > +#define EMC_CTD_V010_BAR_FREGS
> (2)
> > +
> > +/* the 32-bit BAR for the slow registers: */
> > +#define EMC_CTD_V010_BAR_SREGS
> (4)
> > +
> > +/* the maximum number of immediate SGL entries: */
> > +#define EMC_CTD_V010_SGL_IMMEDIATE_MAX
> (7)
> > +
> > +/* the CTD v010 whats: */
> > +#define EMC_CTD_V010_WHAT_DETECT (0)
> > +#define EMC_CTD_V010_WHAT_SCSI_COMMAND
> (1)
> > +#define EMC_CTD_V010_WHAT_SCSI_PHASE
> (2)
> > +#define EMC_CTD_V010_WHAT_SCSI_RESPONSE
> (3)
> > +
> > +/* the CTD v010 detect flags. all undefined flags must be zero: */
> > +
> > +/* if this is set, the name is a SCSI target: */
> > +#define EMC_CTD_V010_DETECT_FLAG_SCSI_TARGET
> (1 << 0)
> > +
> > +/* if this is set, the name is a SCSI initiator: */
> > +#define EMC_CTD_V010_DETECT_FLAG_SCSI_INITIATOR
> (1 << 1)
> > +
> > +/* the CTD v010 SCSI command flags. all undefined flags must be
> zero: */
> > +
> > +/* when the guest receives a SCSI command message, this flag is
> undefined.
> > + *
> > + * If this is set, at the beginning of any data phase the target is the
> data
> > + * source. if this is clear, at the beginning of any data phase the
> target is
> > + * the data sink.
> > + */
> > +#define EMC_CTD_V010_SCSI_COMMAND_FLAG_SOURCE
> (1 << 0)
> > +
> > +/* when the guest receives a SCSI command message, this flag is
> undefined.
> > + *
> > + * if this is set, the first SGL entry in the message points to an
> extended SGL,
> > + * and the remaining SGL entries in the message are undefined. if
> this is
> > + * clear, the SGL entries in the message are used:
> > + */
> > +#define EMC_CTD_V010_SCSI_COMMAND_FLAG_ESGL
> (1 << 1)
> > +
> > +/* the CTD v010 SCSI response flags. all undefined flags must be
> zero: */
> > +
> > +/* if this is set, the SCSI command failed. if this is clear, the
> > + * command succeeded:
> > + */
> > +#define EMC_CTD_V010_SCSI_RESPONSE_FLAG_FAILED
> (1 << 0)
> > +
> > +/* if this is set, any extra information is sense data. if this is clear,
> any
> > + * extra information is 64-bit timestamps:
> > + */
> > +#define EMC_CTD_V010_SCSI_RESPONSE_FLAG_SENSE
> (1 << 1)
> > +
> > +/* the CTD v010 SCSI phase flags. all undefined flags must be zero:
> */
> > +
> > +/* when the guest receives a SCSI phase message, this flag is
> undefined.
> > + *
> > + * if this is set, at this point in the data phase the message receiver
> is the
> > + * data source. if this is clear, at this point in the data phase the
> message
> > + * receiver is the data sink:
> > + */
> > +#define EMC_CTD_V010_SCSI_PHASE_FLAG_SOURCE
> (1 << 0)
> > +
> > +/* when the guest receives a SCSI phase message, this flag is
> undefined.
> > + *
> > + * if this is set, the first SGL entry in the message points to an
> extended SGL,
> > + * and the remaining SGL entries in the message are undefined. if
> this is
> > + * clear, the SGL entries in the message are used:
> > + */
> > +#define EMC_CTD_V010_SCSI_PHASE_FLAG_ESGL (1 << 1)
> > +
> > +/* if this is set, the message receiver is the target. if this is clear, the
> > + * message receiver is the initiator:
> > + */
> > +#define EMC_CTD_V010_SCSI_PHASE_FLAG_TARGET
> (1 << 2)
> > +
> > +/* if this is set, the SCSI command is aborted: */
> > +#define EMC_CTD_V010_SCSI_PHASE_FLAG_ABORT
> (1 << 3)
> > +
> > +/* the size of the log of errored transmit messages: */
> > +#define EMC_CTD_V010_LOG_ERROR_TX_SIZE
> (4)
> > +
> > +/* errors: */
> > +
> > +/* no error: */
> > +#define EMC_CTD_V010_ERROR_NULL
> (0)
> > +
> > +/* the guest tried to transmit a message on a disconnected channel:
> */
> > +#define EMC_CTD_V010_ERROR_TX_CHANNEL_DISCONNECTED
> (1)
> > +
> > +/* the guest tried to transmit a message with a bad what: */
> > +#define EMC_CTD_V010_ERROR_TX_MESSAGE_WHAT
> (2)
> > +
> > +/* the guest tried to transmit a message with a reserved field set to
> > + * the wrong value:
> > + */
> > +#define EMC_CTD_V010_ERROR_TX_MESSAGE_RESERVED
> (3)
> > +
> > +/* the guest tried to transmit an out-of-order message: */
> > +#define EMC_CTD_V010_ERROR_TX_MESSAGE_ORDER
> (4)
> > +
> > +/* the guest tried to transmit a message to an endpoint whose type
> > + * doesn't support it:
> > + */
> > +#define EMC_CTD_V010_ERROR_TX_ENDPOINT_TYPE
> (5)
> > +
> > +/* the guest tried to transmit a message with an unknown message
> > + * receiver's opaque value:
> > + */
> > +#define EMC_CTD_V010_ERROR_TX_OPAQUE_RX_UNKNOWN
> (6)
> > +
> > +/* types: */
> > +
> > +/* a CTD v010 scatter/gather list entry: */
> > +struct emc_ctd_v010_sgl {
> > +
> > + /* the physical address of the buffer: */
> > + emc_ctd_uint32_t emc_ctd_v010_sgl_paddr_0_31;
> > + emc_ctd_uint32_t emc_ctd_v010_sgl_paddr_32_63;
> > +
> > + /* the size of the buffer: */
> > + emc_ctd_uint32_t emc_ctd_v010_sgl_size;
> > +};
> > +
> > +/* a CTD v010 header: */
> > +struct emc_ctd_v010_header {
> > +
> > + /* the other address: */
> > + emc_ctd_uint16_t emc_ctd_v010_header_address;
> > +
> > + /* the minor version: */
> > + emc_ctd_uint8_t emc_ctd_v010_header_minor;
> > +
> > + /* the what: */
> > + emc_ctd_uint8_t emc_ctd_v010_header_what;
> > +};
> > +
> > +/* a CTD v010 name: */
> > +struct emc_ctd_v010_name {
> > +
> > + /* the name: */
> > + emc_ctd_uint8_t emc_ctd_v010_name_bytes[8];
> > +};
> > +
> > +/* a CTD v010 detect message: */
> > +struct emc_ctd_v010_detect {
> > +
> > + /* the header: */
> > + struct emc_ctd_v010_header emc_ctd_v010_detect_header;
> > +
> > + /* the flags: */
> > + emc_ctd_uint32_t emc_ctd_v010_detect_flags;
> > +
> > + /* the name: */
> > + struct emc_ctd_v010_name emc_ctd_v010_detect_name;
> > +
> > + /* the key: */
> > + emc_ctd_uint64_t emc_ctd_v010_detect_key;
> > +};
> > +
> > +/* a CTD v010 SCSI command message: */
> > +struct emc_ctd_v010_scsi_command {
> > +
> > + /* the header: */
> > + struct emc_ctd_v010_header
> emc_ctd_v010_scsi_command_header;
> > +
> > + /* the flags: */
> > + emc_ctd_uint32_t emc_ctd_v010_scsi_command_flags;
> > +
> > + /* the initiator's opaque value: */
> > + emc_ctd_uint64_t emc_ctd_v010_scsi_command_opaque;
> > +
> > + /* the SCSI LUN: */
> > + emc_ctd_uint8_t emc_ctd_v010_scsi_command_lun[8];
> > +
> > + /* the SCSI CDB: */
> > + emc_ctd_uint8_t emc_ctd_v010_scsi_command_cdb[16];
> > +
> > + /* the data size: */
> > + emc_ctd_uint32_t emc_ctd_v010_scsi_command_data_size;
> > +
> > + union {
> > +
> > + /* any SGL entries: */
> > + /* when received by the guest, these are undefined:
> */
> > + struct emc_ctd_v010_sgl
> > +
> emc_ctd_v010_scsi_command_sgl[EMC_CTD_V010_SGL_IMM
> EDIATE_MAX];
> > +
> > + } emc_ctd_v010_scsi_command_u;
> > +};
> > +
> > +/* a CTD v010 SCSI response message: */
> > +struct emc_ctd_v010_scsi_response {
> > +
> > + /* the header: */
> > + struct emc_ctd_v010_header
> emc_ctd_v010_scsi_response_header;
> > +
> > + /* the flags: */
> > + emc_ctd_uint16_t emc_ctd_v010_scsi_response_flags;
> > +
> > + /* the extra information size: */
> > + emc_ctd_uint8_t emc_ctd_v010_scsi_response_extra_size;
> > +
> > + /* the SCSI status: */
> > + emc_ctd_uint8_t emc_ctd_v010_scsi_response_status;
> > +
> > + /* the initiator's opaque value: */
> > + emc_ctd_uint64_t emc_ctd_v010_scsi_response_opaque;
> > +
> > + /* the data size: */
> > + emc_ctd_uint32_t emc_ctd_v010_scsi_response_data_size;
> > +
> > + union {
> > +
> > + /* any extra information: */
> > + emc_ctd_uint8_t
> emc_ctd_v010_scsi_response_extra[108];
> > +
> > + } emc_ctd_v010_scsi_response_u;
> > +};
> > +
> > +/* a CTD v010 SCSI phase message: */
> > +struct emc_ctd_v010_scsi_phase {
> > +
> > + /* the header: */
> > + struct emc_ctd_v010_header
> emc_ctd_v010_scsi_phase_header;
> > +
> > + /* the flags: */
> > + emc_ctd_uint32_t emc_ctd_v010_scsi_phase_flags;
> > +
> > + /* the message receiver's opaque value: */
> > + emc_ctd_uint64_t emc_ctd_v010_scsi_phase_opaque_rx;
> > +
> > + /* the message transmitter's opaque value: */
> > + emc_ctd_uint64_t emc_ctd_v010_scsi_phase_opaque_tx;
> > +
> > + union {
> > +
> > + /* any SGL entries: */
> > + /* when received by the guest, these are undefined:
> */
> > + struct emc_ctd_v010_sgl
> > +
> emc_ctd_v010_scsi_phase_sgl[EMC_CTD_V010_SGL_IMMEDI
> ATE_MAX];
> > +
> > + } emc_ctd_v010_scsi_phase_u;
> > +};
> > +
> > +/* a CTD v010 message: */
> > +union emc_ctd_v010_message {
> > +
> > + /* the header: */
> > + struct emc_ctd_v010_header
> emc_ctd_v010_message_header;
> > +
> > + /* a detect message: */
> > + struct emc_ctd_v010_detect emc_ctd_v010_message_detect;
> > +
> > + /* a SCSI command message: */
> > + struct emc_ctd_v010_scsi_command
> emc_ctd_v010_message_scsi_command;
> > +
> > + /* a SCSI response message: */
> > + struct emc_ctd_v010_scsi_response
> emc_ctd_v010_message_scsi_response;
> > +
> > + /* a SCSI phase message: */
> > + struct emc_ctd_v010_scsi_phase
> emc_ctd_v010_message_scsi_phase;
> > +
> > + /* padding: */
> > + emc_ctd_uint8_t emc_ctd_v010_message_padding[128];
> > +};
> > +
> > +/* the fast registers: */
> > +struct emc_ctd_v010_fregs {
> > +
> > + /* the transmit ring producer index (TPI): */
> > + volatile emc_ctd_uint32_t
> emc_ctd_v010_fregs_tx_index_producer;
> > +
> > + /* the error flag: */
> > + volatile emc_ctd_uint32_t emc_ctd_v010_fregs_error_flag;
> > +
> > + /* errors 1..14: */
> > + volatile emc_ctd_uint32_t
> emc_ctd_v010_fregs_errors_1_14[14];
> > +
> > + /* the transmit ring consumer index (TCI): */
> > + volatile emc_ctd_uint32_t
> emc_ctd_v010_fregs_tx_index_consumer;
> > +
> > + /* the device name: */
> > + struct emc_ctd_v010_name
> emc_ctd_v010_fregs_device_name;
> > +
> > + /* padding: */
> > + emc_ctd_uint8_t
> > + emc_ctd_v010_fregs_pad_07f[64 -
> > + (sizeof(emc_ctd_uint32_t) +
> > + sizeof(struct emc_ctd_v010_name))];
> > +
> > + /* the receive ring producer index (RPI): */
> > + volatile emc_ctd_uint32_t
> emc_ctd_v010_fregs_rx_index_producer;
> > +
> > + /* the interrupt throttle, in units of nanoseconds. zero
> disables
> > + * the throttle:
> > + */
> > + emc_ctd_uint32_t
> emc_ctd_v010_fregs_interrupt_throttle_nsecs;
> > +
> > + /* padding: */
> > + emc_ctd_uint8_t
> > + emc_ctd_v010_fregs_pad_0bf[64 -
> > + (sizeof(emc_ctd_uint32_t) +
> sizeof(emc_ctd_uint32_t))];
> > +
> > + /* the receive ring consumer index (RCI): */
> > + volatile emc_ctd_uint32_t
> emc_ctd_v010_fregs_rx_index_consumer;
> > +
> > + /* padding: */
> > + emc_ctd_uint8_t
> > + emc_ctd_v010_fregs_pad_0ff[64 -
> > + (sizeof(emc_ctd_uint32_t) +
> > + (sizeof(emc_ctd_uint32_t) *
> > +
> EMC_CTD_V010_LOG_ERROR_TX_SIZE))];
> > +
> > + /* the errors for the log of errored transmit messages: */
> > + volatile emc_ctd_uint32_t
> > +
> emc_ctd_v010_fregs_log_error_tx_error[EMC_CTD_V010_LO
> G_ERROR_TX_SIZE];
> > +
> > + /* the log of errored transmit messages: */
> > + union emc_ctd_v010_message
> > +
> emc_ctd_v010_fregs_log_error_tx_message[EMC_CTD_V010
> _LOG_ERROR_TX_SIZE];
> > +};
> > +
> > +/* the slow registers: */
> > +struct emc_ctd_v010_sregs {
> > +
> > + /* the reset register: */
> > + emc_ctd_uint32_t emc_ctd_v010_sregs_reset;
> > +};
> > +
> > +#endif /* _EMC_CTD_INTERFACE_H */
> > diff --git a/drivers/scsi/emcctd/emcctd.c
> b/drivers/scsi/emcctd/emcctd.c
> > new file mode 100644
> > index 0000000..aa6dd0e
> > --- /dev/null
> > +++ b/drivers/scsi/emcctd/emcctd.c
> > @@ -0,0 +1,2840 @@
> > +/*
> > + * EMCCTD: EMC Cut-Through HBA Driver for SCSI subsystem.
> > + *
> > + * Copyright (C) 2015 by EMC Corporation, Hopkinton, MA.
> > + *
> > + * Authors:
> > + * fredette, matt <matt.fredette@xxxxxxx>
> > + * Pirotte, Serge <serge.pirotte@xxxxxxx>
> > + * Singh Animesh <Animesh.Singh@xxxxxxx>
> > + * Singhal, Maneesh <Maneesh.Singhal@xxxxxxx>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License
> > + * as published by the Free Software Foundation; either version 2
> > + * of the License, or (at your option) any later version.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied
> warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
> the
> > + * GNU General Public License for more details.
> > + *
> > + */
> > +
> > +#include <linux/init.h>
> > +#include <linux/kernel.h>
> > +#include <linux/kthread.h>
> > +#include <linux/slab.h>
> > +#include <linux/list.h>
> > +#include <linux/module.h>
> > +#include <linux/spinlock.h>
> > +#include <linux/pci.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/proc_fs.h>
> > +#include <linux/version.h>
> > +#include <linux/delay.h>
> > +#include <linux/blkdev.h>
> > +#include <linux/atomic.h>
> > +
> > +#include <linux/cache.h>
> > +
> > +#include <linux/seq_file.h>
> > +
> > +#include <scsi/scsi.h>
> > +#include <scsi/scsi_cmnd.h>
> > +#include <scsi/scsi_device.h>
> > +#include <scsi/scsi_host.h>
> > +#include <scsi/scsi_transport.h>
> > +#include <scsi/scsi_dbg.h>
> > +
> > +#define emc_ctd_uint8_t u8
> > +#define emc_ctd_uint16_t u16
> > +#define emc_ctd_uint32_t u32
> > +#define emc_ctd_uint64_t u64
> > +
> > +#include "emc_ctd_interface.h"
> > +
> > +#include "emcctd.h"
> > +
> > +#include <scsi/scsi_dbg.h>
> > +
> > +/* nomenclature for versioning
> > + * MAJOR:MINOR:SUBVERSION:PATCH
> > + */
> > +
> > +#define EMCCTD_MODULE_VERSION "2.0.0.24"
> > +
> > +MODULE_LICENSE("GPL");
> > +MODULE_AUTHOR("EMC");
> > +MODULE_DESCRIPTION("EMC CTD V1 - Build 18-Jan-2016");
> > +MODULE_VERSION(EMCCTD_MODULE_VERSION);
> > +
> > +int ctd_debug;
> > +module_param_named(ctd_debug, ctd_debug, int, S_IRUGO |
> S_IWUSR);
> > +MODULE_PARM_DESC(ctd_debug, "Enable driver debug
> messages(0=off, 1=on)");
> > +
> > +static int emcctd_max_luns = EMCCTD_MAX_LUN;
> > +module_param_named(max_luns, emcctd_max_luns, int,
> S_IRUGO | S_IWUSR);
> > +MODULE_PARM_DESC(max_luns,
> > + "Specify the maximum number of LUN's per
> host(default=16384)");
> > +
> > +static int emcctd_cmd_per_lun = EMCCTD_CMD_PER_LUN;
> > +module_param_named(cmd_per_lun, emcctd_cmd_per_lun, int,
> S_IRUGO | S_IWUSR);
> > +MODULE_PARM_DESC(cmd_per_lun,
> > + "Specify the maximum commands per
> lun(default=64)");
> > +
> > +/*
> > + * routines to handle scsi cmd buffer
> > + */
> > +static int ctd_xmit_command(struct scsi_cmnd *cmnd,
> > + struct ctd_pci_private
> *ctd_private);
> > +static void ctd_handle_scsi_response(
> > + struct emc_ctd_v010_scsi_response *io_response,
> > + struct ctd_pci_private *ctd_private);
> > +
> > +static int ctd_hw_enqueue_request(union
> emc_ctd_v010_message *ctd_request,
> > + struct ctd_pci_private
> *ctd_private);
> > +static int ctd_hw_dequeue_response(union
> emc_ctd_v010_message *ctd_response,
> > + struct ctd_pci_private
> *ctd_private);
> > +static int ctd_scsi_response_sanity_check(
> > + struct ctd_request_private *request_private,
> > + struct ctd_pci_private *ctd_private);
> > +
> > +/*
> > + * routines to handle memory and queue management between
> client and server
> > + */
> > +static int ctd_hw_execute_command(struct scsi_cmnd *cmnd,
> > + struct ctd_pci_private *ctd_private);
> > +static int ctd_initiator_translate_sgl(struct scsi_cmnd *cmnd,
> > + struct emc_ctd_v010_scsi_command
> *ctd_request,
> > + struct ctd_pci_private *ctd_private);
> > +static int ctd_initiator_translate_request(struct scsi_cmnd *cmnd,
> > + struct emc_ctd_v010_scsi_command
> *ctd_request,
> > + struct ctd_pci_private *ctd_private);
> > +static void ctd_initiator_translate_lun(struct scsi_cmnd *cmnd,
> > + struct emc_ctd_v010_scsi_command
> *ctd_request);
> > +
> > +static struct ctd_request_private *ctd_acquire_request(
> > + struct ctd_pci_private *ctd_private);
> > +static void ctd_release_request(struct ctd_request_private
> *ctd_request,
> > + struct ctd_pci_private
> *ctd_private);
> > +static void ctd_release_io_pool(struct ctd_pci_private
> *ctd_private);
> > +static int ctd_alloc_io_pool(struct ctd_pci_private *ctd_private,
> > + unsigned int
> pool_size);
> > +static void ctd_check_error_condition(struct pci_dev *pci_dev);
> > +static int ctd_init_event_thread(struct ctd_pci_private
> *ctd_private);
> > +static void ctd_destroy_event_thread(struct ctd_pci_private
> *ctd_private);
> > +/*
> > + * routines related to tasklet functionality
> > + */
> > +static void ctd_check_response_queue(unsigned long
> instance_addr);
> > +
> > +static int ctd_ITnexus_handler(struct ctd_pci_private *ctd_private);
> > +/*
> > + * routines related to internal representation of scsi targets
> > + */
> > +static int ctd_target_alloc(struct scsi_target *starget);
> > +static void ctd_target_destroy(struct scsi_target *starget);
> > +/*
> > + * routines registered with the linux scsi midlayer
> > + */
> > +static int ctd_queuecommand_lck(struct scsi_cmnd *cmnd,
> > + void (*done)(struct scsi_cmnd *));
> > +static DEF_SCSI_QCMD(ctd_queuecommand)
> > +static int ctd_slave_configure(struct scsi_device *sdp);
> > +static int ctd_slave_alloc(struct scsi_device *sdev);
> > +static void ctd_slave_destroy(struct scsi_device *sdev);
> > +static int ctd_abort_handler(struct scsi_cmnd *cmd);
> > +
> > +static enum blk_eh_timer_return ctd_timeout_handler(struct
> scsi_cmnd *scmd);
> > +
> > +
> > +/*
> > + * routines related to initialization of the pseudo hardware
> > + */
> > +static void ctd_init_scsi_host_private(struct Scsi_Host *shost,
> > + struct pci_dev
> *pci_dev);
> > +
> > +static int ctd_scsi_layer_init(struct pci_dev *pci_dev);
> > +static int ctd_scsi_layer_cleanup(struct pci_dev *pci_dev);
> > +
> > +#ifdef CONFIG_PM
> > +static int ctd_pci_suspend(struct pci_dev *pci_dev, pm_message_t
> state);
> > +static int ctd_pci_resume(struct pci_dev *pci_dev);
> > +#endif
> > +
> > +static void ctd_pci_remove(struct pci_dev *pci_dev);
> > +static int ctd_request_msi(struct pci_dev *pci_dev);
> > +static int ctd_pci_probe(struct pci_dev *pci_dev,
> > + const struct pci_device_id *id);
> > +static void ctd_clear_io_queue(struct ctd_pci_private
> *ctd_private);
> > +
> > +#if !defined(__VMKLNX__)
> > +static int ctd_proc_init(struct pci_dev *pci_dev);
> > +static void ctd_proc_remove(struct pci_dev *pci_dev);
> > +
> > +static int ctd_proc_open(struct inode *inode, struct file *file);
> > +#endif
> > +
> > +static int ctd_post_event(union emc_ctd_v010_message *io_msg,
> > + struct ctd_pci_private *ctd_private);
> > +static int ctd_event_handler(void *ctd_thread_args);
> > +
> > +unsigned int lun_discovery_complete;
> > +wait_queue_head_t lun_discovery_event_barrier;
> > +
> > +static const struct pci_device_id ctd_pci_id_table[] = {
> > + { EMC_CTD_PCI_VENDOR, EMC_CTD_V010_PCI_PRODUCT,
> > + PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
> > + { 0 },
> > +};
> > +
> > +MODULE_DEVICE_TABLE(pci, ctd_pci_id_table);
> > +
> > +static struct pci_driver ctd_pci_driver = {
> > + .name = "emcctd",
> > + .id_table = ctd_pci_id_table,
> > + .probe = ctd_pci_probe,
> > + .remove = ctd_pci_remove,
> > +#ifdef CONFIG_PM
> > + .suspend = ctd_pci_suspend,
> > + .resume = ctd_pci_resume,
> > +#endif
> > +};
> > +
> > +static struct scsi_host_template scsi_ctd_template = {
> > + .name = DRV_NAME,
> > + .proc_name = DRV_NAME,
> > + .queuecommand = ctd_queuecommand,
> > +
> > + .eh_timed_out = ctd_timeout_handler,
> > +
> > + .slave_alloc = ctd_slave_alloc,
> > + .slave_configure = ctd_slave_configure,
> > + .slave_destroy = ctd_slave_destroy,
> > + .eh_abort_handler = ctd_abort_handler,
> > + .target_alloc = ctd_target_alloc,
> > + .target_destroy = ctd_target_destroy,
> > + .can_queue = EMCCTD_CMD_PER_LUN,
> > + .this_id = EMCCTD_THIS_ID,
> > + .sg_tablesize = SG_ALL,
> > + .max_sectors = SCSI_DEFAULT_MAX_SECTORS,
> > + .cmd_per_lun = EMCCTD_CMD_PER_LUN,
> > + .use_clustering = DISABLE_CLUSTERING,
> > + .module = THIS_MODULE,
> > +};
> > +
> > +
> > +#if !defined(__VMKLNX__)
> > +static struct proc_dir_entry *ctd_proc_directory;
> > +
> > +static int
> > +ctd_proc_show(struct seq_file *m, void *v)
> > +{
> > + int i;
> > + struct ctd_pci_private *ctd_private =
> > + (struct ctd_pci_private *)m->private;
> > +
> > + seq_printf(m,
> > + "number interrupts: %ld\n"
> > + "requests queued: %ld\n"
> > + "responses received: %ld\n"
> > + "pending IO count: %ld\n"
> > + "Abort Sent: %ld\n"
> > + "Abort received: %ld\n"
> > + "What received: %ld\n"
> > + "What sent: %ld\n"
> > + "free IO entries : %ld\n"
> > + "CTD WWN: %x.%x.%x.%x.%x.%x.%x.%x\n",
> > + ctd_private->hw_stats.interrupts.counter,
> > + ctd_private->hw_stats.requests_sent.counter,
> > + ctd_private-
> >hw_stats.responses_received.counter,
> > + ctd_private-
> >hw_stats.active_io_count.counter,
> > + ctd_private->hw_stats.abort_sent.counter,
> > + ctd_private-
> >hw_stats.abort_received.counter,
> > + ctd_private->hw_stats.what_in.counter,
> > + ctd_private->hw_stats.what_out.counter,
> > + ctd_private-
> >hw_stats.free_io_entries.counter,
> > + ctd_private->pci_fast_registers-
> >emc_ctd_v010_fregs_device_name.emc_ctd_v010_name_bytes[0],
> > + ctd_private->pci_fast_registers-
> >emc_ctd_v010_fregs_device_name.emc_ctd_v010_name_bytes[1],
> > + ctd_private->pci_fast_registers-
> >emc_ctd_v010_fregs_device_name.emc_ctd_v010_name_bytes[2],
> > + ctd_private->pci_fast_registers-
> >emc_ctd_v010_fregs_device_name.emc_ctd_v010_name_bytes[3],
> > + ctd_private->pci_fast_registers-
> >emc_ctd_v010_fregs_device_name.emc_ctd_v010_name_bytes[4],
> > + ctd_private->pci_fast_registers-
> >emc_ctd_v010_fregs_device_name.emc_ctd_v010_name_bytes[5],
> > + ctd_private->pci_fast_registers-
> >emc_ctd_v010_fregs_device_name.emc_ctd_v010_name_bytes[6],
> > + ctd_private->pci_fast_registers-
> >emc_ctd_v010_fregs_device_name.emc_ctd_v010_name_bytes[7]);
> > +
> > +#define MAX_ENTRIES_IN_LINE 10
> > + seq_puts(m, "\nIO Latency (in tsc) for last 200 IOs:\n");
> > +
> > + for (i = 0; i < CTD_MAX_IO_STATS; i++) {
> > + if (0 == (i % MAX_ENTRIES_IN_LINE))
> > + seq_puts(m, "\n");
> > +
> > + seq_printf(m, "%lld \t", ctd_private-
> >hw_stats.io_stats[i]);
> > + }
> > + seq_puts(m, "\n");
> > +
> > + return 0;
> > +
> > +}
> > +
> > +#endif
> > +
> > +static void
> > +scsi_translate_sam_code(struct scsi_cmnd *cmnd, unsigned char
> ScsiStatus)
> > +{
> > + unsigned char host_status;
> > + unsigned char driver_status;
> > +
> > + host_status = DID_OK;
> > + driver_status = DRIVER_OK;
> > + cmnd->result |= ScsiStatus & 0xff;
> > +
> > + switch (ScsiStatus) {
> > +
> > + case SAM_STAT_GOOD:
> > + case SAM_STAT_CONDITION_MET:
> > + case SAM_STAT_INTERMEDIATE_CONDITION_MET:
> > + case SAM_STAT_INTERMEDIATE:
> > + break;
> > + case SAM_STAT_CHECK_CONDITION:
> > + case SAM_STAT_RESERVATION_CONFLICT:
> > + case SAM_STAT_ACA_ACTIVE:
> > + driver_status = DRIVER_SENSE;
> > + break;
> > + case SAM_STAT_TASK_SET_FULL:
> > + case SAM_STAT_BUSY:
> > + driver_status = DRIVER_BUSY;
> > + host_status = DID_REQUEUE;
> > + break;
> > + case SAM_STAT_TASK_ABORTED:
> > + driver_status = DRIVER_ERROR;
> > + host_status = DID_ABORT;
> > + break;
> > + case SAM_STAT_COMMAND_TERMINATED:
> > + default:
> > + ctd_dprintk_crit(
> > + "cmnd = %p [ channel:%d id:%d lun:%lld]
> INVALID SAM = %x\n",
> > + cmnd, cmnd->device->channel, cmnd-
> >device->id,
> > + cmnd->device->lun, ScsiStatus);
> > +
> > + driver_status = DRIVER_INVALID;
> > + host_status = DID_ABORT;
> > + break;
> > + }
> > + set_driver_byte(cmnd, driver_status);
> > + set_host_byte(cmnd, host_status);
> > +}
> > +
> > +static void
> > +scsi_free_ctd_request_private(struct ctd_request_private
> *request_private,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > +
> > + if (request_private->cdb_page) {
> > + __free_pages(request_private->cdb_page,
> > + request_private->cdb_page_order);
> > + }
> > + if (request_private->sgllist_page) {
> > + __free_pages(request_private->sgllist_page,
> > + request_private->sgllist_page_order);
> > + }
> > +
> > + ctd_release_request(request_private, ctd_private);
> > +}
> > +
> > +static int
> > +ctd_handle_disconnect(struct emc_ctd_v010_detect *io_detect,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int i;
> > + int error;
> > + struct ctd_target_info *ctd_target;
> > + struct ctd_host_info *ctd_host;
> > +
> > + error = -ENODEV;
> > +
> > + ctd_dprintk_crit("\n");
> > +
> > + ctd_host = ctd_private->host_private;
> > +
> > + /* Current implementation only handles the disconnect of
> > + * the target and not initiators
> > + */
> > + for (i = 0; i < EMCCTD_MAX_ID; i++) {
> > + ctd_target = &ctd_host->target[i];
> > +
> > + /* detect header address is used to uniquely identify
> the target
> > + * for which the disconnect event has been posted by
> the server
> > + */
> > +
> > + if (ctd_target-
> >ctd_detect.emc_ctd_detect_header_address ==
> > + io_detect->emc_ctd_detect_header_address)
> {
> > + /* check the current link status of the target */
> > + if (ctd_target-
> >ctd_detect.emc_ctd_v010_detect_flags) {
> > + ctd_dprintk_crit("\n");
> > +
> > + ctd_target-
> >ctd_detect.emc_ctd_v010_detect_flags =
> > + io_detect-
> >emc_ctd_v010_detect_flags;
> > +
> > +
> ctd_check_error_condition(ctd_private->pci_dev);
> > + } else {
> > + ctd_dprintk_crit(
> > + "target %llx already in
> disconnect state\n",
> > + (emc_ctd_uint64_t)ctd_target-
> >ctd_detect_name_bytes[0]);
> > + }
> > + error = 0;
> > + break;
> > + }
> > + }
> > +
> > + if (error)
> > + ctd_dprintk_crit("Error\n");
> > +
> > + return error;
> > +}
> > +
> > +static int
> > +ctd_handle_target_addition(struct emc_ctd_v010_detect
> *io_detect,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int i;
> > + int error;
> > + struct ctd_target_info *ctd_target;
> > + struct ctd_host_info *ctd_host;
> > +
> > + error = -ENOMEM;
> > + ctd_host = ctd_private->host_private;
> > +
> > + ctd_dprintk("header addr -> %x key -> %llx\n",
> > + io_detect->emc_ctd_detect_header_address,
> > + io_detect->emc_ctd_v010_detect_key);
> > +
> > + for (i = 0; i < EMCCTD_MAX_ID; i++) {
> > + ctd_target = &ctd_host->target[i];
> > +
> > + /* detect header address is used to uniquely identify
> the target
> > + * for which the connect event has been posted by the
> server
> > + * check if this particular target is already recorded with
> the
> > + * client check if the recorded target is in the correct
> state
> > + * and if not found record this particular target in the
> list of
> > + * the detected targets
> > + */
> > +
> > + if (ctd_target->ctd_detect.emc_ctd_v010_detect_key
> ==
> > + io_detect->emc_ctd_v010_detect_key) {
> > + error = 0;
> > + ctd_dprintk("\n");
> > +
> > + scsi_target_unblock(&ctd_target->starget-
> >dev,
> > + SDEV_RUNNING);
> > + ctd_target-
> >ctd_detect.emc_ctd_v010_detect_flags =
> > + io_detect-
> >emc_ctd_v010_detect_flags;
> > + break;
> > + }
> > +
> > + /* End of list for the recorded targets in the client, so
> the
> > + * reported target is a new target being reported by
> the server
> > + * thus needs to be added to the list
> > + */
> > + if (ctd_target-
> >ctd_detect.emc_ctd_v010_detect_flags == 0x0) {
> > + error = 0;
> > + ctd_dprintk("\n");
> > + ctd_target->ctd_detect = *io_detect;
> > + break;
> > + }
> > + }
> > + if (error)
> > + ctd_dprintk_crit("Error\n");
> > +
> > + return error;
> > +}
> > +
> > +static int
> > +ctd_handle_source_addition(struct emc_ctd_v010_detect
> *io_detect,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + ctd_dprintk("functionality not supported\n");
> > + return -ENODEV;
> > +}
> > +
> > +static int
> > +ctd_handle_detect(struct emc_ctd_v010_detect *io_detect,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int error;
> > +
> > + /*
> > + * We post the detect event in the event queue and return.
> While
> > + * ctd_event_thread actually consumes the requests in the
> event queue.
> > + * This is done to serialize the consecutive detect requests
> (disconnect
> > + * followed by connect). This mechanism handles the situation
> when
> > + * multiple detect comes in a quick succession. Also, there is a
> > + * seperate thread and its queue for each adapter, so detect
> requests
> > + * for different adapters shall be handled seperately.
> > + */
> > + error = ctd_post_event((union emc_ctd_v010_message
> *)io_detect,
> > +
> ctd_private);
> > +
> > + if (!error)
> > + atomic_long_inc(&ctd_private->hw_stats.what_in);
> > +
> > + return error;
> > +
> > +}
> > +
> > +static void
> > +ctd_handle_scsi_command(struct emc_ctd_v010_scsi_command
> *io_command,
> > + struct ctd_pci_private
> *ctd_private)
> > +{
> > + ctd_dprintk_crit("unsupported\n");
> > +}
> > +
> > +static void
> > +ctd_handle_scsi_phase(struct emc_ctd_v010_scsi_phase
> *io_phase,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int error;
> > + unsigned long flags;
> > + struct scsi_cmnd *cmnd;
> > + struct ctd_request_private *request_private;
> > +
> > + /* check the phase flag to confirm we have received correct
> phase msg */
> > + if (io_phase->emc_ctd_v010_scsi_phase_flags &
> > +
> EMC_CTD_V010_SCSI_PHASE_FLAG_TARGET) {
> > + ctd_dprintk_crit("SCSI_PHASE_FLAG_TARGET not
> supported\n");
> > + return;
> > + }
> > +
> > + if (!(io_phase->emc_ctd_v010_scsi_phase_flags &
> > +
> EMC_CTD_V010_SCSI_PHASE_FLAG_ABORT)) {
> > + ctd_dprintk_crit("scsi_phase_flags %x invalid\n",
> > + io_phase->emc_ctd_v010_scsi_phase_flags);
> > + return;
> > + }
> > +
> > + request_private = (struct ctd_request_private *)
> > + ((uintptr_t)(io_phase-
> >emc_ctd_v010_scsi_phase_opaque_rx));
> > +
> > + error = ctd_scsi_response_sanity_check(request_private,
> ctd_private);
> > +
> > + if (error)
> > + return;
> > +
> > + cmnd = request_private->cmnd;
> > +
> > + ctd_dprintk_crit("SCSI_PHASE_FLAG_ABORT cmnd-> %p
> request -> %p\n",
> > + cmnd, request_private);
> > +
> > + atomic_long_inc(&ctd_private->hw_stats.abort_received);
> > +
> > + switch (request_private->io_state) {
> > +
> > + case CTD_IO_REQUEST_QUEUED:
> > + case CTD_IO_REQUEST_REQUEUED:
> > + spin_lock_irqsave(&ctd_private->io_mgmt_lock,
> flags);
> > +
> > + list_del(&request_private->list);
> > + atomic_long_dec(&ctd_private-
> >hw_stats.active_io_count);
> > +
> > + spin_unlock_irqrestore(&ctd_private->io_mgmt_lock,
> flags);
> > + break;
> > +
> > + case CTD_IO_REQUEST_ABORTED:
> > + spin_lock_irqsave(&ctd_private->io_mgmt_lock,
> flags);
> > +
> > + list_del(&request_private->list);
> > +
> > + spin_unlock_irqrestore(&ctd_private->io_mgmt_lock,
> flags);
> > +
> > + case CTD_IO_REQUEST_REPLY_AWAITED:
> > + scsi_free_ctd_request_private(request_private,
> ctd_private);
> > + return;
> > +
> > + case CTD_IO_REQUEST_FREE:
> > + case CTD_IO_REQUEST_INVALID:
> > + default:
> > + ctd_dprintk_crit("opaque @ %p in unknown state
> %x\n",
> > + request_private, request_private->io_state);
> > + return;
> > + }
> > +
> > + cmnd->host_scribble = NULL;
> > + request_private->cmnd = NULL;
> > + request_private->io_state = CTD_IO_REQUEST_COMPLETED;
> > + scsi_free_ctd_request_private(request_private, ctd_private);
> > +
> > + /* error propagation to the SCSI midlayer */
> > + scsi_translate_sam_code(cmnd, SAM_STAT_TASK_ABORTED);
> > + scsi_set_resid(cmnd, scsi_bufflen(cmnd));
> > + cmnd->scsi_done(cmnd);
> > +}
> > +
> > +static void
> > +ctd_handle_response(union emc_ctd_v010_message
> *io_message,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + struct emc_ctd_v010_header *msg_header;
> > +
> > + msg_header = &io_message-
> >emc_ctd_v010_message_header;
> > +
> > + switch (msg_header->emc_ctd_v010_header_what) {
> > +
> > + case EMC_CTD_V010_WHAT_DETECT:
> > + ctd_handle_detect((struct emc_ctd_v010_detect
> *)io_message,
> > + ctd_private);
> > + break;
> > + case EMC_CTD_V010_WHAT_SCSI_COMMAND:
> > + ctd_handle_scsi_command(
> > + (struct emc_ctd_v010_scsi_command
> *)io_message,
> > + ctd_private);
> > + break;
> > + case EMC_CTD_V010_WHAT_SCSI_PHASE:
> > + ctd_handle_scsi_phase(
> > + (struct emc_ctd_v010_scsi_phase *)
> io_message,
> > + ctd_private);
> > + break;
> > + case EMC_CTD_V010_WHAT_SCSI_RESPONSE:
> > + ctd_handle_scsi_response(
> > + (struct emc_ctd_v010_scsi_response
> *)io_message,
> > + ctd_private);
> > + break;
> > + default:
> > + ctd_dprintk_crit("unknown what -> %x ctd_private ->
> %p",
> > + msg_header->emc_ctd_v010_header_what,
> ctd_private);
> > + }
> > +}
> > +
> > +
> > +static int
> > +ctd_scsi_response_sanity_check(struct ctd_request_private
> *request_private,
> > + struct ctd_pci_private
> *ctd_private)
> > +{
> > + int rc;
> > + unsigned long flags;
> > + struct scsi_cmnd *cmnd;
> > + struct ctd_request_private *request, *request_next;
> > + int outstanding_io_count = 0;
> > +
> > + rc = -EFAULT;
> > +
> > + /* check if the opaque is within the valid range */
> > + if (!((request_private >= ctd_private->io_map) &&
> > + (request_private < ctd_private->io_map_end))) {
> > + ctd_dprintk_crit(
> > + "ERROR request_private -> %p in invalid
> range\n",
> > + request_private);
> > + goto ctd_scsi_response_sanity_check_complete;
> > + }
> > +
> > + if (request_private) {
> > + cmnd = request_private->cmnd;
> > + if (cmnd) {
> > + /* check if the back pointer is valid before we
> declare
> > + * request sane
> > + */
> > + if ((request_private == (struct
> ctd_request_private
> > + *)cmnd->host_scribble)) {
> > + rc = 0;
> > + goto
> ctd_scsi_response_sanity_check_complete;
> > + }
> > + }
> > + /* check if the request has already been completed to
> the SCSI
> > + * Midlayer
> > + */
> > + else if ((request_private->io_state ==
> > + CTD_IO_REQUEST_ABORTED) ||
> > + (request_private->io_state ==
> > +
> CTD_IO_REQUEST_REPLY_AWAITED)) {
> > + rc = 0;
> > + goto
> ctd_scsi_response_sanity_check_complete;
> > + }
> > +
>
> You don't do any cleanup work at
> ctd_scsi_response_sanity_check_complete. You
> could just reutrn 0 here as well.
[MS>] Just avoiding multiple exit points from the function
>
> > +
> > + ctd_dprintk_crit(
> > + "ERROR cmnd -> %p mismatched
> request_private -> %p host_scribble -> %p requests send -> %ld
> responses received -> %ld state -> %s\n",
> > + cmnd, request_private,
> > + (cmnd ? cmnd->host_scribble : 0x0),
> > + ctd_private-
> >hw_stats.requests_sent.counter,
> > + ctd_private-
> >hw_stats.responses_received.counter,
> > + (request_private->io_state ==
> > + CTD_IO_REQUEST_QUEUED ?
> > +
> "CTD_IO_REQUEST_QUEUED" :
> > + (request_private->io_state ==
> > + CTD_IO_REQUEST_REQUEUED
> ?
> > +
> "CTD_IO_REQUEST_REQUEUED" :
> > + (request_private->io_state ==
> > + CTD_IO_REQUEST_ABORTED ?
> > +
> "CTD_IO_REQUEST_ABORTED" :
> > + (request_private->io_state ==
> > + CTD_IO_REQUEST_FREE ?
> > +
> "CTD_IO_REQUEST_FREE" :
> > + (request_private->io_state ==
> > + CTD_IO_REQUEST_INVALID ?
> > +
> "CTD_IO_REQUEST_INVALID" :
> > + (request_private->io_state ==
> > +
> CTD_IO_REQUEST_COMPLETED ?
> > +
> "CTD_IO_REQUEST_COMPLETED" :
> > + (request_private->io_state ==
> > +
> CTD_IO_REQUEST_REPLY_AWAITED ?
> > +
> "CTD_IO_REQUEST_REPLY_AWAITED" :
> > + "UNKNOWN"))))))));
> > +
> > + spin_lock_irqsave(&ctd_private->io_mgmt_lock,
> flags);
> > +
> > + list_for_each_entry_safe(request, request_next,
> > + &ctd_private->aborted_io_list,
> list) {
> > + if (request == request_private) {
> > + ctd_dprintk_crit(
> > + "request_private -> %p in
> aborted_io_list\n",
> > + request_private);
> > + break;
> > + }
> > + }
> > +
> > + list_for_each_entry_safe(request, request_next,
> > + &ctd_private->queued_io_list,
> list) {
> > + if (request == request_private) {
> > + ctd_dprintk_crit(
> > + "request_private -> %p in
> queued_io_list\n",
> > + request_private);
> > + }
> > + outstanding_io_count++;
> > + }
> > + ctd_dprintk_crit("outstanding_io_count = %d\n",
> > + outstanding_io_count);
> > +
> > + list_for_each_entry_safe(request, request_next,
> > + &ctd_private-
> >requeued_io_list, list) {
> > + if (request == request_private) {
> > + ctd_dprintk_crit(
> > + "request_private -> %p in
> requeued_io_list\n",
> > + request_private);
> > + break;
> > + }
> > + }
> > +
> > + list_for_each_entry_safe(request, request_next,
> > + &ctd_private->io_pool, list) {
> > + if (request == request_private) {
> > + ctd_dprintk_crit(
> > + "request_private -> %p in free
> io_pool\n",
> > + request_private);
> > + break;
> > + }
> > + }
> > +
> > + spin_unlock_irqrestore(&ctd_private->io_mgmt_lock,
> flags);
> > + } else {
> > + ctd_dprintk_crit("ERROR request_private -> NULL\n");
> > + }
> > +
> > +ctd_scsi_response_sanity_check_complete:
> > + return rc;
> > +}
> > +
> > +static void
> > +ctd_handle_scsi_response(struct emc_ctd_v010_scsi_response
> *io_response,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int error;
> > + unsigned long flags;
> > + struct scsi_cmnd *cmnd;
> > + struct ctd_request_private *request_private;
> > + unsigned long long io_stats;
> > +
> > + request_private = (struct ctd_request_private *)
> > + ((uintptr_t)(io_response-
> >emc_ctd_v010_scsi_response_opaque));
> > +
> > + error = ctd_scsi_response_sanity_check(request_private,
> ctd_private);
> > +
> > + if (error)
> > + return;
> > +
> > + io_stats = ctd_read_tsc();
> > +
> > + io_stats -= request_private->io_start_time;
> > +
> > + ctd_private->hw_stats.io_stats[ctd_private-
> >hw_stats.io_stats_index++] =
> > + io_stats;
> > +
> > + if (ctd_private->hw_stats.io_stats_index ==
> CTD_MAX_IO_STATS)
> > + ctd_private->hw_stats.io_stats_index = 0;
> > + /*
> > + * check if the IO context is in the aborted IO list
> > + */
> > +
> > + /* Increment the responses_received stats */
> > + atomic_long_inc(&ctd_private-
> >hw_stats.responses_received);
> > +
> > + switch (request_private->io_state) {
> > +
> > + /*
> > + * The state of the request is important
> > + * CTD_IO_REQUEST_QUEUED : cmnd is still alive and valid in
> kernel
> > + * CTD_IO_REQUEST_ABORTED : cmnd has already been
> handled before
> > + * the response from the device
> and
> > + * only request needs to be
> cleaned
> > + * up from the abort list
> > + * CTD_IO_REQUEST_FREE : represents a state which is
> unhandled (unknown)
> > + * CTD_IO_REQUEST_REPLY_AWAITED : represents a state
> where abort
> > + * could not be sent by the timeout
> handler
> > + * CTD_IO_REQUEST_INVALID : represents a state which is
> > + * unhandled (unknown)
> > + */
> > +
> > + case CTD_IO_REQUEST_QUEUED:
> > + case CTD_IO_REQUEST_REQUEUED:
> > + spin_lock_irqsave(&ctd_private->io_mgmt_lock,
> flags);
> > +
> > + list_del(&request_private->list);
> > + request_private->io_state =
> CTD_IO_REQUEST_COMPLETED;
> > +
> > + spin_unlock_irqrestore(&ctd_private->io_mgmt_lock,
> flags);
> > + break;
> > +
> > + case CTD_IO_REQUEST_ABORTED:
> > + /*
> > + * cmnd is already disassociated from the request
> private and IO
> > + * completed to the SCSI Midlayer by the
> timeout|abort handler
> > + * delink the request private from the aborted list and
> cleanup
> > + */
> > + spin_lock_irqsave(&ctd_private->io_mgmt_lock,
> flags);
> > + list_del(&request_private->list);
> > + spin_unlock_irqrestore(&ctd_private->io_mgmt_lock,
> flags);
> > +
> > + case CTD_IO_REQUEST_REPLY_AWAITED:
> > + /*
> > + * return the context back to the io_pool for its reuse
> > + */
> > + request_private->io_state =
> CTD_IO_REQUEST_COMPLETED;
> > + scsi_free_ctd_request_private(request_private,
> ctd_private);
> > + /* IO already completed to the Midlayer */
> > + return;
> > +
> > + case CTD_IO_REQUEST_FREE:
> > + case CTD_IO_REQUEST_INVALID:
> > + default:
> > + ctd_dprintk_crit(
> > + "opaque @ %p in unknown state %x\n",
> > + request_private, request_private->io_state);
> > + return;
> > +
> > + }
> > +
> > + /* Decrement active_io_count only when request is still
> queued. */
> > + atomic_long_dec(&ctd_private->hw_stats.active_io_count);
> > +
> > + cmnd = request_private->cmnd;
> > +
> > + cmnd->result = 0;
> > +
> > + scsi_translate_sam_code(cmnd,
> > + io_response-
> >emc_ctd_v010_scsi_response_status);
> > +
> > + scsi_set_resid(cmnd, scsi_bufflen(cmnd) -
> > + io_response-
> >emc_ctd_v010_scsi_response_data_size);
> > +
> > + if (io_response->emc_ctd_v010_scsi_response_flags &
> > +
> EMC_CTD_V010_SCSI_RESPONSE_FLAG_FAILED) {
> > + ctd_dprintk_crit(
> > + "cmnd = %p CTDCM_FAILED channel:%d id:%d
> lun:%lld] status = %x\n",
> > + cmnd, cmnd->device->channel, cmnd->device-
> >id,
> > + cmnd->device->lun,
> > + io_response-
> >emc_ctd_v010_scsi_response_status);
> > +
> > + set_host_byte(cmnd, DID_ERROR);
> > + if (ctd_debug) {
> > + scsi_print_command(cmnd);
> > + scsi_print_result(cmnd, NULL, FAILED);
> > + scsi_print_sense(cmnd);
> > + }
> > + }
> > + if (io_response->emc_ctd_v010_scsi_response_flags &
> > +
> EMC_CTD_V010_SCSI_RESPONSE_FLAG_SENSE) {
> > + unsigned char *sense_data;
> > + unsigned char sense_data_length;
> > +
> > + sense_data = io_response-
> >emc_ctd_scsi_response_extra;
> > + sense_data_length =
> > + io_response-
> >emc_ctd_v010_scsi_response_extra_size;
> > +
> > + memcpy(cmnd->sense_buffer, sense_data,
> sense_data_length);
> > +
> > + set_driver_byte(cmnd, DRIVER_SENSE);
> > + if (ctd_debug) {
> > + scsi_print_command(cmnd);
> > + scsi_print_result(cmnd, "emcctd sense",
> SUCCESS);
> > + scsi_print_sense(cmnd);
> > + }
> > + }
> > +
> > + if ((io_response->emc_ctd_v010_scsi_response_status ==
> > +
> SAM_STAT_TASK_SET_FULL) ||
> > + (io_response->emc_ctd_v010_scsi_response_status
> ==
> > +
> SAM_STAT_BUSY)) {
> > +
> > + ctd_dprintk(
> > + "QUEUE DEPTH change for channel:%d id:%d
> lun:%lld] active io count = %lx\n",
> > + cmnd->device->channel, cmnd->device->id,
> > + cmnd->device->lun,
> > + ctd_private-
> >hw_stats.active_io_count.counter);
> > +
> > + scsi_track_queue_full(cmnd->device,
> > + ctd_private-
> >hw_stats.active_io_count.counter);
> > + }
> > +
> > +
> > + cmnd->host_scribble = NULL;
> > +
> > + scsi_free_ctd_request_private(request_private, ctd_private);
> > +
> > + cmnd->scsi_done(cmnd);
> > +}
> > +
> > +static void
> > +ctd_scsi_transfer_info(unsigned char *cmd, unsigned long long
> *lba,
> > + unsigned int *num, unsigned int *ei_lba)
> > +{
> > + *ei_lba = 0;
> > +
> > + switch (*cmd) {
> > +
> > + case VARIABLE_LENGTH_CMD:
> > + *lba = (u64)cmd[19] | (u64)cmd[18] << 8 |
> > + (u64)cmd[17] << 16 | (u64)cmd[16] << 24 |
> > + (u64)cmd[15] << 32 | (u64)cmd[14] << 40 |
> > + (u64)cmd[13] << 48 | (u64)cmd[12] << 56;
> > +
> > + *ei_lba = (u32)cmd[23] | (u32)cmd[22] << 8 |
> > + (u32)cmd[21] << 16 | (u32)cmd[20] << 24;
> > +
> > + *num = (u32)cmd[31] | (u32)cmd[30] << 8 |
> (u32)cmd[29] << 16 |
> > + (u32)cmd[28] << 24;
> > + break;
> > +
> > + case WRITE_SAME_16:
> > + case WRITE_16:
> > + case READ_16:
> > + *lba = (u64)cmd[9] | (u64)cmd[8] << 8 |
> > + (u64)cmd[7] << 16 | (u64)cmd[6] << 24 |
> > + (u64)cmd[5] << 32 | (u64)cmd[4] << 40 |
> > + (u64)cmd[3] << 48 | (u64)cmd[2] << 56;
> > +
> > + *num = (u32)cmd[13] | (u32)cmd[12] << 8 |
> (u32)cmd[11] << 16 |
> > + (u32)cmd[10] << 24;
> > + break;
> > + case WRITE_12:
> > + case READ_12:
> > + *lba = (u32)cmd[5] | (u32)cmd[4] << 8 | (u32)cmd[3]
> << 16 |
> > + (u32)cmd[2] << 24;
> > +
> > + *num = (u32)cmd[9] | (u32)cmd[8] << 8 | (u32)cmd[7]
> << 16 |
> > + (u32)cmd[6] << 24;
> > + break;
> > + case WRITE_SAME:
> > + case WRITE_10:
> > + case READ_10:
> > + case XDWRITEREAD_10:
> > + *lba = (u32)cmd[5] | (u32)cmd[4] << 8 |
> (u32)cmd[3] << 16 |
> > + (u32)cmd[2] << 24;
> > +
> > + *num = (u32)cmd[8] | (u32)cmd[7] << 8;
> > + break;
> > + case WRITE_6:
> > + case READ_6:
> > + *lba = (u32)cmd[3] | (u32)cmd[2] << 8 |
> > + (u32)(cmd[1] & 0x1f) << 16;
> > + *num = (cmd[4] == 0) ? 256 : cmd[4];
> > + break;
> > + default:
> > + break;
> > + }
> > +}
> > +
> > +
> > +static int
> > +ctd_initiator_validate_sgl(struct scsi_cmnd *cmnd,
> > + struct emc_ctd_v010_scsi_command
> *ctd_request,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int i;
> > + int error;
> > + struct emc_ctd_v010_sgl *sgl_current;
> > + struct emc_ctd_v010_sgl *sgl_extended;
> > + emc_ctd_uint64_t sgl_count;
> > + unsigned int sgl_buffersize;
> > + unsigned long long lba;
> > + unsigned int num;
> > + unsigned int ei_lba;
> > +
> > + lba = 0;
> > + num = 0;
> > + ei_lba = 0;
> > + error = -EINVAL;
> > + sgl_count = 0;
> > + sgl_extended = &ctd_request-
> >emc_ctd_scsi_command_sgl[0];
> > +
> > + if (ctd_request->emc_ctd_v010_scsi_command_flags &
> > +
> EMC_CTD_V010_SCSI_COMMAND_FLAG_ESGL) {
> > + emc_ctd_uint64_t extented_sgl_size;
> > +
> > + sgl_current = phys_to_virt(
> > + ((emc_ctd_uint64_t)sgl_extended-
> >emc_ctd_v010_sgl_paddr_32_63 << 32) |
> > + ((emc_ctd_uint64_t)sgl_extended-
> >emc_ctd_v010_sgl_paddr_0_31 & 0xFFFFFFFF));
> > +
> > + extented_sgl_size = sgl_extended-
> >emc_ctd_v010_sgl_size;
> > +
> > + do_div(extented_sgl_size, sizeof(struct
> emc_ctd_v010_sgl));
> > +
> > + sgl_count = extented_sgl_size;
> > + } else {
> > + sgl_current = sgl_extended;
> > + while (sgl_current < sgl_extended +
> > +
> EMC_CTD_V010_SGL_IMMEDIATE_MAX) {
> > + if (sgl_current->emc_ctd_v010_sgl_size == 0)
> > + break;
> > +
> > + sgl_current++;
> > + sgl_count++;
> > + }
> > + sgl_current = sgl_extended;
> > + }
> > +
> > + if (scsi_sg_count(cmnd) != sgl_count) {
> > + scsi_print_command(cmnd);
> > + ctd_dprintk_crit(
> > + "Mismatched cmnd_sgl_count %d sgl_count =
> %lld sgl_size = %d\n",
> > + scsi_sg_count(cmnd),
> > + sgl_count, sgl_extended-
> >emc_ctd_v010_sgl_size);
> > + }
> > +
> > + if (sgl_count) {
> > + struct scatterlist *cmnd_sg;
> > + int cmnd_sg_count = scsi_sg_count(cmnd);
> > +
> > + if (cmnd_sg_count >
> EMC_CTD_V010_SGL_IMMEDIATE_MAX) {
> > + if ((ctd_request-
> >emc_ctd_v010_scsi_command_flags &
> > +
> EMC_CTD_V010_SCSI_COMMAND_FLAG_ESGL) == 0) {
> > + scsi_print_command(cmnd);
> > + ctd_dprintk_crit(
> > + "scsi_sg_count = %d but
> EMC_CTD_V010_SCSI_COMMAND_FLAG_ESGL not set\n",
> > + scsi_sg_count(cmnd));
> > +
> > + cmnd_sg_count =
> EMC_CTD_V010_SGL_IMMEDIATE_MAX;
> > + }
> > + }
> > +
> > + scsi_for_each_sg(cmnd, cmnd_sg, cmnd_sg_count, i) {
> > + int cmnd_sg_size;
> > + emc_ctd_uint64_t cmnd_buffer_pfn;
> > + struct page *cmnd_page;
> > + emc_ctd_uint32_t cmnd_offset;
> > + emc_ctd_uint32_t sgl_size;
> > + emc_ctd_uint64_t buffer_pfn;
> > +
> > + cmnd_page = sg_page(cmnd_sg);
> > + cmnd_buffer_pfn =
> page_to_phys(cmnd_page);
> > + cmnd_sg_size = cmnd_sg->length;
> > + cmnd_offset = cmnd_sg->offset;
> > +
> > +
> > + sgl_size = (sgl_current + i)-
> >emc_ctd_v010_sgl_size;
> > + buffer_pfn = (((emc_ctd_uint64_t)
> > + ((sgl_current + i)-
> >emc_ctd_v010_sgl_paddr_32_63) << 32) |
> > + ((emc_ctd_uint64_t)((sgl_current + i)-
> >emc_ctd_v010_sgl_paddr_0_31) & 0xFFFFFFFF));
> > +
> > + if ((sgl_size != cmnd_sg_size) ||
> > + (buffer_pfn !=
> (cmnd_buffer_pfn +
> > + cmnd_offset)))
> {
> > + scsi_print_command(cmnd);
> > + ctd_dprintk_crit(
> > + "Mismatch @ i = %d
> cmnd_sg_size = %d cmnd_buffer_pfn = %llx sgl_size = %d buffer_pfn
> = %llx\n",
> > + i, cmnd_sg_size,
> cmnd_buffer_pfn,
> > + sgl_size, buffer_pfn);
> > + }
> > + }
> > + goto ctd_initiator_validate_sgl_end;
> > + }
> > +
> > + for (i = 0, sgl_buffersize = 0; i < sgl_count; i++, sgl_current++)
> > + sgl_buffersize += sgl_current-
> >emc_ctd_v010_sgl_size;
> > +
> > + if (scsi_bufflen(cmnd) && (sgl_buffersize !=
> scsi_bufflen(cmnd))) {
> > + scsi_print_command(cmnd);
> > + ctd_dprintk_crit("Mismatched buffer size %d %d\n",
> > + scsi_bufflen(cmnd), sgl_buffersize);
> > + goto ctd_initiator_validate_sgl_end;
> > + }
> > +
> > + ctd_scsi_transfer_info((unsigned char *)cmnd->cmnd, &lba,
> > + &num, &ei_lba);
> > +
> > + if (num && (sgl_buffersize != (num * 512))) {
> > + scsi_print_command(cmnd);
> > + ctd_dprintk_crit("Mismatched buffer size %d %d\n",
> > + (num * 512), sgl_buffersize);
> > + goto ctd_initiator_validate_sgl_end;
> > + }
> > + error = 0;
>
> There is no cleanup done at this label so no need to jump here. Reutrn
> directly
> from the jumping position.
[MS>] Yes it could be done... we are just avoiding multiple returns from the function.
>
> > +ctd_initiator_validate_sgl_end:
> > + return error;
> > +}
> > +
> > +static int
> > +ctd_initiator_translate_sgl(struct scsi_cmnd *cmnd,
> > + struct emc_ctd_v010_scsi_command
> *ctd_request,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int i;
> > + int size;
> > + int error;
> > + int sg_count;
> > + int rq_count;
> > + int embedded_sgl_count;
> > + int embedded_sgl_index;
> > + struct ctd_request_private *request_private;
> > + emc_ctd_uint64_t buffer_pfn;
> > +
> > + error = FAILED;
> > + i = size = 0;
> > + embedded_sgl_index = 0;
> > + embedded_sgl_count =
> EMC_CTD_V010_SGL_IMMEDIATE_MAX;
> > + rq_count = 0;
> > +
> > + request_private = (struct ctd_request_private *)cmnd-
> >host_scribble;
> > + sg_count = scsi_sg_count(cmnd);
> > +
> > + if (sg_count > embedded_sgl_count) {
> > + struct scatterlist *sg;
> > + struct emc_ctd_v010_sgl *sgl_current;
> > + struct emc_ctd_v010_sgl *sgl_extended;
> > +
> > + request_private->sgllist_page_order =
> > + get_order((sizeof(struct emc_ctd_v010_sgl) *
> sg_count));
> > + request_private->sgllist_page =
> > + alloc_pages(GFP_ATOMIC | __GFP_COMP |
> __GFP_NOWARN,
> > + request_private->sgllist_page_order);
> > +
> > + if (!request_private->sgllist_page) {
> > + ctd_dprintk_crit("alloc_page failure\n");
> > + goto scsi_initiator_translate_sgl_end;
> > + }
> > +
> > + sgl_current = (struct emc_ctd_v010_sgl *)
> > + page_address(request_private->sgllist_page);
> > +
> > + scsi_for_each_sg(cmnd, sg, sg_count, i) {
> > +#if defined(__VMKLNX__)
> > + sgl_current->emc_ctd_v010_sgl_paddr_0_31 =
> > + sg->cursgel->addr &
> 0xFFFFFFFF;
> > + sgl_current->emc_ctd_v010_sgl_paddr_32_63
> =
> > + sg->cursgel->addr >>
> 32;
> > + sgl_current->emc_ctd_v010_sgl_size =
> sg_dma_len(sg);
> > +#else
> > + struct page *page;
> > +
> > + page = sg_page(sg);
> > + buffer_pfn = page_to_phys(page);
> > + size += sg->length;
> > +
> > + sgl_current->emc_ctd_v010_sgl_paddr_0_31 =
> > + (buffer_pfn + sg->offset) &
> 0xFFFFFFFF;
> > + sgl_current->emc_ctd_v010_sgl_paddr_32_63
> =
> > + (buffer_pfn + sg->offset) >>
> 32;
> > + sgl_current->emc_ctd_v010_sgl_size = sg-
> >length;
> > +#endif
> > + sgl_current++;
> > + rq_count++;
> > + }
> > + sgl_extended = &ctd_request-
> >emc_ctd_scsi_command_sgl[0];
> > + buffer_pfn = page_to_phys(request_private-
> >sgllist_page);
> > +
> > + sgl_extended->emc_ctd_v010_sgl_paddr_0_31 =
> > + buffer_pfn & 0xFFFFFFFF;
> > + sgl_extended->emc_ctd_v010_sgl_paddr_32_63 =
> buffer_pfn >> 32;
> > + sgl_extended->emc_ctd_v010_sgl_size =
> > + rq_count * sizeof(struct
> emc_ctd_v010_sgl);
> > + ctd_request->emc_ctd_v010_scsi_command_flags |=
> > +
> EMC_CTD_V010_SCSI_COMMAND_FLAG_ESGL;
> > + } else {
> > + struct scatterlist *sg;
> > + struct emc_ctd_v010_sgl *sgl_current;
> > +
> > + sgl_current = &ctd_request-
> >emc_ctd_scsi_command_sgl[0];
> > +
> > + scsi_for_each_sg(cmnd, sg, sg_count, i) {
> > +#if defined(__VMKLNX__)
> > + sgl_current->emc_ctd_v010_sgl_paddr_0_31 =
> > + sg->cursgel->addr &
> 0xFFFFFFFF;
> > + sgl_current->emc_ctd_v010_sgl_paddr_32_63
> =
> > + sg->cursgel->addr >>
> 32;
> > + sgl_current->emc_ctd_v010_sgl_size =
> sg_dma_len(sg);
> > +#else
> > + struct page *page;
> > +
> > + size += sg->length;
> > + page = sg_page(sg);
> > + buffer_pfn = page_to_phys(page);
> > +
> > + sgl_current->emc_ctd_v010_sgl_paddr_0_31 =
> > + (buffer_pfn + sg->offset) &
> 0xFFFFFFFF;
> > + sgl_current->emc_ctd_v010_sgl_paddr_32_63
> =
> > + (buffer_pfn + sg->offset) >>
> 32;
> > + sgl_current->emc_ctd_v010_sgl_size = sg-
> >length;
> > +#endif
> > +
> > + sgl_current++;
> > + rq_count++;
> > + }
> > + }
> > + error = SUCCESS;
> > +
> > + if (ctd_debug)
> > + ctd_initiator_validate_sgl(cmnd, ctd_request,
> ctd_private);
> > +
> > +scsi_initiator_translate_sgl_end:
> > + return error;
> > +}
> > +
> > +
> > +void
> > +ctd_initiator_translate_lun(struct scsi_cmnd *cmnd,
> > + struct emc_ctd_v010_scsi_command
> *ctd_request)
> > +{
> > +
> > + int i;
> > + union ctd_scsi_lun {
> > + emc_ctd_uint64_t scsi_lun_64;
> > + emc_ctd_uint8_t scsi_lun_8[8];
> > + } ctd_scsi_lun_conversion;
> > +
> > + ctd_scsi_lun_conversion.scsi_lun_64 = cpu_to_be64(cmnd-
> >device->lun);
> > + for (i = 0; i < sizeof(ctd_scsi_lun_conversion); i++) {
> > + ctd_request->emc_ctd_v010_scsi_command_lun[i] =
> > + ctd_scsi_lun_conversion.scsi_lun_8[i];
> > + }
> > +}
> > +
> > +static int
> > +ctd_initiator_translate_request(struct scsi_cmnd *cmnd,
> > + struct emc_ctd_v010_scsi_command
> *ctd_request,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int error;
> > + struct ctd_dev_info *ctd_device;
> > + struct ctd_request_private *request_private;
> > + int scsi_cdb_size;
> > +
> > + error = FAILED;
> > + request_private = NULL;
> > + ctd_device = cmnd->device->hostdata;
> > +
> > + if (!(ctd_device->ctd_target_detect-
> >emc_ctd_v010_detect_flags &
> > +
> EMC_CTD_V010_DETECT_FLAG_SCSI_TARGET)) {
> > + goto scsi_initiator_translate_request_end;
> > + }
> > + memset(ctd_request, 0x0, sizeof(struct
> emc_ctd_v010_scsi_command));
> > +
> > + ctd_request->emc_ctd_scsi_command_header_address =
> > + ctd_device->ctd_target_detect-
> >emc_ctd_detect_header_address;
> > + ctd_request-
> >emc_ctd_v010_scsi_command_header.emc_ctd_v010_header_mino
> r =
> > +
> EMCCTD_V010_PROTOCOL_MINOR_VERSION;
> > + ctd_request-
> >emc_ctd_v010_scsi_command_header.emc_ctd_v010_header_what
> =
> > +
> EMC_CTD_V010_WHAT_SCSI_COMMAND;
> > + ctd_request->emc_ctd_v010_scsi_command_flags |=
> > + ((cmnd->sc_data_direction ==
> DMA_FROM_DEVICE) ?
> > +
> EMC_CTD_V010_SCSI_COMMAND_FLAG_SOURCE :
> > + ((cmnd->sc_data_direction ==
> > + DMA_TO_DEVICE) ? 0 :
> 0));
> > +
> > + request_private = ctd_acquire_request(ctd_private);
> > +
> > + if (request_private == NULL) {
> > + ctd_dprintk_crit("ctd_acquire_request failure\n");
> > + goto scsi_initiator_translate_request_end;
> > + }
> > +
> > + request_private->cmnd = cmnd;
> > +
> > + cmnd->host_scribble = (unsigned char *)request_private;
> > +
> > + ctd_request->emc_ctd_v010_scsi_command_data_size =
> scsi_bufflen(cmnd);
> > +
> > + ctd_request->emc_ctd_v010_scsi_command_opaque =
> > + (uintptr_t)request_private;
> > +
> > + ctd_initiator_translate_lun(cmnd, ctd_request);
> > +
> > + scsi_cdb_size = cmnd->cmd_len;
> > +
> > + if (scsi_cdb_size <=
> > + sizeof(ctd_request-
> >emc_ctd_v010_scsi_command_cdb)) {
> > + memcpy(ctd_request-
> >emc_ctd_v010_scsi_command_cdb,
> > + cmnd->cmnd,
> scsi_cdb_size);
> > + } else {
> > + ctd_dprintk_crit("unsupported scsi cdb size = %d\n",
> > + scsi_cdb_size);
> > + goto scsi_initiator_translate_request_end;
> > + }
> > +
> > + error = ctd_initiator_translate_sgl(cmnd, ctd_request,
> ctd_private);
> > +
> > +scsi_initiator_translate_request_end:
> > + if (error == FAILED) {
> > + cmnd->host_scribble = NULL;
> > + if (request_private) {
> > +
> scsi_free_ctd_request_private(request_private,
> > +
> ctd_private);
> > + }
> > + }
> > + return error;
> > +}
> > +
> > +
> > +static int
> > +ctd_hw_execute_command(struct scsi_cmnd *cmnd,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int error;
> > + unsigned long flags;
> > + struct emc_ctd_v010_scsi_command ctd_request;
> > +
> > + error = ctd_initiator_translate_request(cmnd, &ctd_request,
> > + ctd_private);
> > +
> > + if (error == SUCCESS) {
> > + struct ctd_request_private *request_private;
> > +
> > + request_private =
> > + (struct ctd_request_private *)cmnd-
> >host_scribble;
> > +
> > + /* lock ordering ... io_mgmt_lock followed by isr_lock
> > + * ensures that request placed in legitimate queue ...
> > + * so that response finds in the correct queue
> > + */
> > + spin_lock_irqsave(&ctd_private->io_mgmt_lock,
> flags);
> > +
> > + request_private->io_start_time = ctd_read_tsc();
> > +
> > + error = ctd_hw_enqueue_request(
> > + (union emc_ctd_v010_message
> *)&ctd_request,
> > + ctd_private);
> > + if (error == SUCCESS) {
> > + list_add_tail(&request_private->list,
> > + &ctd_private-
> >queued_io_list);
> > + atomic_long_inc(&ctd_private-
> >hw_stats.requests_sent);
> > + atomic_long_inc(&ctd_private-
> >hw_stats.active_io_count);
> > + }
> > +
> > + spin_unlock_irqrestore(&ctd_private->io_mgmt_lock,
> flags);
> > +
> > + if (error != SUCCESS) {
> > + ctd_dprintk_crit("ctd_hw_enqueue_request
> error\n");
> > + scsi_free_ctd_request_private(
> > + (struct ctd_request_private *)
> > + (uintptr_t)
> > +
> (ctd_request.emc_ctd_v010_scsi_command_opaque),
> > + ctd_private);
> > + }
> > + }
> > +
> > + return error;
> > +}
> > +
> > +static int
> > +ctd_hw_enqueue_request(union emc_ctd_v010_message
> *ctd_request,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int error;
> > + unsigned long flags;
> > + union emc_ctd_v010_message *ctd_request_block;
> > +
> > + spin_lock_irqsave(&ctd_private->isr_lock, flags);
> > +
> > + /*
> > + * check if any space is available in the array
> > + */
> > + ctd_request_block =
> > + ((((ctd_private->request_producer_index + 1) %
> > + ctd_private->pci_request_queue_size) ==
> > + ctd_private->request_consumer_index) ?
> > + NULL :
> > + (ctd_private->pci_request_array +
> > + ctd_private-
> >request_producer_index));
> > +
> > +
> > + error = (ctd_request_block ? SUCCESS : FAILED);
> > +
> > + if (error == SUCCESS) {
> > + *ctd_request_block = *ctd_request;
> > +
> > + ctd_private->request_producer_index =
> > + ((ctd_private->request_producer_index + 1) %
> > + ctd_private-
> >pci_request_queue_size);
> > +
> > + }
> > +
> > + spin_unlock_irqrestore(&ctd_private->isr_lock, flags);
> > +
> > + return error;
> > +}
> > +
> > +static int
> > +ctd_hw_dequeue_response(union emc_ctd_v010_message
> *ctd_response,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int rc;
> > + unsigned long flags;
> > + union emc_ctd_v010_message *ctd_response_block;
> > +
> > + /* protect ourselves from another instance */
> > + spin_lock_irqsave(&ctd_private->isr_lock, flags);
> > +
> > + ctd_response_block =
> > + ((ctd_private->response_consumer_index ==
> > + ctd_private->response_producer_index) ?
> NULL :
> > + (ctd_private->pci_response_array +
> > + ctd_private-
> >response_consumer_index));
> > +
> > + rc = ctd_response_block ? SUCCESS : FAILED;
> > +
> > + if (rc == SUCCESS) {
> > + *ctd_response = *ctd_response_block;
> > + ctd_private->response_consumer_index =
> > + ((ctd_private->response_consumer_index + 1)
> %
> > + ctd_private->pci_response_queue_size);
> > + } else {
> > + ctd_check_error_condition(ctd_private->pci_dev);
> > + }
> > +
> > + spin_unlock_irqrestore(&ctd_private->isr_lock, flags);
> > +
> > + return rc;
> > +
> > +}
> > +
> > +static int
> > +ctd_xmit_command(struct scsi_cmnd *cmnd,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int error;
> > +
> > + cmnd->result = DID_OK;
> > + error = ctd_hw_execute_command(cmnd, ctd_private);
> > + return error;
> > +}
> > +
> > +
> > +static int
> > +ctd_queuecommand_lck(struct scsi_cmnd *cmnd, void
> (*done)(struct scsi_cmnd *))
> > +{
> > + int error;
> > + struct ctd_host_info *ctd_host;
> > + struct ctd_pci_private *ctd_private;
> > +
> > + error = 0;
> > + ctd_host = shost_priv(cmnd->device->host);
> > + ctd_private = pci_get_drvdata(ctd_host->pci_dev);
> > +
> > + switch (ctd_private->hw_state) {
> > +
> > + case CTD_HW_STATE_INITIALIZED:
> > + cmnd->scsi_done = done;
> > + if (ctd_xmit_command(cmnd, ctd_private) ==
> SUCCESS)
> > + break;
> > +
> > + case CTD_HW_STATE_DISABLED:
> > + cmnd->scsi_done = done;
> > + scsi_translate_sam_code(cmnd,
> SAM_STAT_TASK_ABORTED);
> > + scsi_set_resid(cmnd, scsi_bufflen(cmnd));
> > + cmnd->scsi_done(cmnd);
> > + break;
> > + default:
> > + error = SCSI_MLQUEUE_HOST_BUSY;
> > + }
> > +
> > + return error;
> > +}
> > +
> > +static int
> > +ctd_abort_handler(struct scsi_cmnd *cmnd)
> > +{
> > + ctd_dprintk_crit("SCSI cmnd -> %p ERROR\n",
> > + cmnd);
> > + return SUCCESS;
> > +}
> > +
> > +
> > +static int
> > +ctd_target_alloc(struct scsi_target *starget)
> > +{
> > + int error;
> > + struct ctd_target_info *ctd_target;
> > + struct ctd_host_info *ctd_host;
> > +
> > + error = -ENODEV;
> > + ctd_host = shost_priv(dev_to_shost(&starget->dev));
> > +
> > + ctd_dprintk("starget -> %p id -> %x\n",
> > + starget, starget->id);
> > +
> > + ctd_target = &ctd_host->target[starget->id];
> > +
> > + /* check for the connection status in the detect flag
> > + * also check if the target already registered with the SCSI
> midlayer
> > + */
> > + if (ctd_target->starget == NULL &&
> > + (ctd_target-
> >ctd_detect.emc_ctd_v010_detect_flags &
> > +
> EMC_CTD_V010_DETECT_FLAG_SCSI_TARGET)) {
> > + error = 0;
> > + ctd_target->starget = starget;
> > + starget->hostdata = ctd_target;
> > + } else {
> > + if (ctd_target->starget != starget) {
> > + ctd_dprintk_crit(
> > + "failure ctd_target->starget %p and
> starget %p dissimilar\n",
> > + ctd_target->starget, starget);
> > + } else {
> > + ctd_dprintk_crit("failure starget %p
> unexpected\n",
> > + starget);
> > + }
> > + }
> > +
> > + return error;
> > +}
> > +
> > +void
> > +ctd_target_destroy(struct scsi_target *starget)
> > +{
> > + int i;
> > + int error;
> > + struct ctd_target_info *ctd_target;
> > + struct ctd_host_info *ctd_host;
> > +
> > + error = -ENODEV;
> > + ctd_host = shost_priv(dev_to_shost(&starget->dev));
> > +
> > + ctd_dprintk_crit("starget @ id = %x\n", starget->id);
> > +
> > + for (i = 0; i < EMCCTD_MAX_ID; i++) {
> > + ctd_target = &ctd_host->target[i];
> > + if (ctd_target->starget == starget) {
> > + ctd_target->starget = NULL;
> > + error = 0;
> > + break;
> > + }
> > + }
> > +
> > + if (error) {
> > + ctd_dprintk_crit("failure for starget @ id = %x\n",
> > + starget->id);
> > + }
> > +}
> > +
> > +static int
> > +ctd_slave_configure(struct scsi_device *sdevice)
> > +{
> > + int error;
> > + struct ctd_dev_info *ctd_device;
> > + struct ctd_host_info *ctd_host;
> > +
> > + error = 0;
> > + ctd_host = shost_priv(sdevice->host);
> > + ctd_device = sdevice->hostdata;
> > +
> > + /* tune the block layer to generate timout
> > + * for the requests queued and reply is awaited
> > + */
> > + blk_queue_rq_timeout(sdevice->request_queue,
> EMCCTD_REQUEST_TIMEOUT);
> > +
>
> static int ctd_slave_configure(struct scsi_device *sdev)
> {
>
> /* tune the block layer to generate timout
> * for the requests queued and reply is awaited
> */
> blk_queue_rq_timeout(sdevice->request_queue,
> EMCCTD_REQUEST_TIMEOUT);
> }
[MS>] Yup right. I missed this.

>
> > + return error;
> > +}
> > +
> > +
> > +
> > +static int
> > +ctd_slave_alloc(struct scsi_device *sdev)
> > +{
> > + int error;
> > + struct ctd_host_info *ctd_host;
> > + struct ctd_target_info *ctd_target;
> > + struct ctd_dev_info *ctd_device;
> > +
> > + error = -ENOMEM;
> > + ctd_host = shost_priv(sdev->host);
> > + sdev->host->max_cmd_len = EMCCTD_V010_MAX_CDB_SIZE;
> > +
> > + ctd_device = (struct ctd_dev_info *)
> > + kzalloc(sizeof(struct ctd_dev_info),
> GFP_ATOMIC);
>
> Please don't cast the return value of kzalloc()
>
[MS>] Hmmmm

> > + if (ctd_device == NULL)
>
> return -ENOMEM;
>
> > + goto ctd_slave_alloc_end;
> > +
> > + ctd_target = &ctd_host->target[sdev->id];
> > + if (ctd_target->starget)
> > + ctd_device->ctd_target_detect = &ctd_target-
> >ctd_detect;
> > +
> > + if (ctd_device->ctd_target_detect) {
> > + error = 0;
> > + ctd_device->ctd_host = ctd_host;
> > + ctd_device->ctd_target = ctd_target;
> > + sdev->hostdata = ctd_device;
> > + queue_flag_set_unlocked(QUEUE_FLAG_BIDI, sdev-
> >request_queue);
> > + } else {
> > + kfree(ctd_device);
> > + error = -ENODEV;
> > + }
> > +
> > +ctd_slave_alloc_end:
> > +
> > + if (error) {
> > + ctd_dprintk_crit("channel = %x id= %x error = %x\n",
> > + sdev->channel, sdev->id, error);
> > + }
> > + return error;
> > +}
> > +
> > +static void
> > +ctd_slave_destroy(struct scsi_device *sdev)
> > +{
> > + struct ctd_dev_info *dev_info;
> > +
> > + dev_info = sdev->hostdata;
> > + kfree(dev_info);
> > +}
> > +
> > +static enum blk_eh_timer_return
> > +ctd_timeout_handler(struct scsi_cmnd *cmd)
> > +{
> > + int requeue_error;
> > + unsigned long flags;
> > + enum blk_eh_timer_return error;
> > + struct ctd_host_info *ctd_host;
> > + struct ctd_pci_private *ctd_private;
> > + struct ctd_request_private *request;
>
> This variable's name is a bit of confusing (struct request *request ;-).
> Maybe ctd_privreq?
[MS>] Yes will fix.
>
> > + unsigned long long tsc_val;
> > +
> > + requeue_error = FAILED;
> > + error = BLK_EH_NOT_HANDLED;
> > + ctd_host = shost_priv(cmd->device->host);
> > + ctd_private = pci_get_drvdata(ctd_host->pci_dev);
> > +
> > +
> > + request = (struct ctd_request_private *)cmd->host_scribble;
> > +
> > + tsc_val = ctd_read_tsc();
> > +
> > + tsc_val -= request->io_start_time;
> > +
> > + ctd_dprintk_crit("cmnd -> %p request -> %p, tsc -> %lld\n",
> > + cmd, request, tsc_val);
> > +
> > + spin_lock_irqsave(&ctd_private->io_mgmt_lock, flags);
> > +
> > + if (request && request->io_timeout < EMCCTD_MAX_RETRY) {
>
> The following block is a bit long and therefore it's hard to spot an
> eventual
> error of handling the io_mgmt_lock. Can't it be factored out in a helper
> function?
>
[MS>] I know its little longer, but actually fits logically together... Will see if it can be factored. Not sure though.

> > + struct ctd_dev_info *ctd_device;
> > +
> > + switch (request->io_state) {
> > +
> > + /* check if the IO in the queued_io_list */
> > + case CTD_IO_REQUEST_QUEUED:
> > + /* check if the IO is already requeued */
> > + case CTD_IO_REQUEST_REQUEUED:
> > + /* remove the old IO context from the
> requeued_io_list
> > + * or queued_io_list
> > + */
> > + list_del(&request->list);
> > + atomic_long_dec(&ctd_private-
> >hw_stats.active_io_count);
> > +
> > + ctd_device = cmd->device->hostdata;
> > +
> > + if (!(ctd_device->ctd_target_detect-
> >emc_ctd_v010_detect_flags &
> > +
> EMC_CTD_V010_DETECT_FLAG_SCSI_TARGET)) {
> > + ctd_dprintk_crit("device
> diconnected\n");
> > + } else {
> > + union emc_ctd_v010_message
> ctd_message;
> > + struct emc_ctd_v010_scsi_phase
> *ctd_phase;
> > +
> > + memset(&ctd_message, 0x0,
> > + sizeof(union
> emc_ctd_v010_message));
> > + ctd_phase =
> > + (struct
> emc_ctd_v010_scsi_phase *) &
> > +
> ctd_message.emc_ctd_v010_message_scsi_phase;
> > +
> > + /* Need to acertain if this is how an IO
> is
> > + * aborted by the specification
> > + */
> > +
> > + /*
> > + * OPT-438489 the phase flag needs to
> be
> > + * initialized with PHASE_FLAG_TARGET
> If EMC
> > + * CTD V010 SCSI PHASE FLAG TARGET
> is set, the
> > + * message receiver is the target,
> otherwise the
> > + * message receiver is the initiator. If
> EMC CTD
> > + * V010 SCSI PHASE FLAG ABORT is set,
> the SCSI
> > + * command is aborted.
> > + */
> > + ctd_phase-
> >emc_ctd_v010_scsi_phase_flags =
> > +
> EMC_CTD_V010_SCSI_PHASE_FLAG_ABORT |
> > +
> EMC_CTD_V010_SCSI_PHASE_FLAG_TARGET;
> > +
> > + ctd_phase-
> >emc_ctd_v010_scsi_phase_opaque_tx =
> > +
> (uintptr_t)request;
> > + ctd_phase-
> >emc_ctd_v010_scsi_phase_opaque_rx =
> > +
> (-1);
> > + ctd_phase-
> >emc_ctd_scsi_phase_header_what =
> > +
> EMC_CTD_V010_WHAT_SCSI_PHASE;
> > + ctd_phase-
> >emc_ctd_scsi_phase_header_minor =
> > +
> EMCCTD_V010_PROTOCOL_MINOR_VERSION;
> > + ctd_phase-
> >emc_ctd_scsi_phase_header_address =
> > + ctd_device-
> >ctd_target_detect->emc_ctd_detect_header_address;
> > +
> > + requeue_error =
> > +
> ctd_hw_enqueue_request(&ctd_message,
> > +
> ctd_private);
> > + }
> > +
> > +
> > + if (requeue_error != SUCCESS) {
> > + /* add the IO context to
> requeued_io_list */
> > + /* Client would try to abort the request
> in next
> > + * timeout (after 20 seconds)
> > + */
> > + request->io_state =
> CTD_IO_REQUEST_REQUEUED;
> > + list_add_tail(&request->list,
> > + &ctd_private-
> >requeued_io_list);
> > + request->io_timeout++;
> > + error = BLK_EH_RESET_TIMER;
> > + } else {
> > + request->cmnd = NULL;
> > + cmd->host_scribble = NULL;
> > +
> > + request->io_state =
> CTD_IO_REQUEST_ABORTED;
> > + request->purge_lifetime =
> > + jiffies +
> EMCCTD_OPAQUE_PURGE_WAITTIME;
> > + list_add_tail(&request->list,
> > + &ctd_private-
> >aborted_io_list);
> > + atomic_long_inc(&ctd_private-
> >hw_stats.abort_sent);
> > +
> > + /* error propagation to the SCSI
> midlayer */
> > + scsi_translate_sam_code(cmd,
> > +
> SAM_STAT_TASK_ABORTED);
> > + scsi_set_resid(cmd,
> scsi_bufflen(cmd));
> > +
> > + /* indicate no more requeue of this
> particular
> > + * IO is needed
> > + */
> > + error = BLK_EH_HANDLED;
> > + }
> > + break;
> > +
> > + default:
> > + ctd_dprintk_crit(
> > + "request @ %p in unexpected state
> %x\n",
> > + request, request->io_state);
> > + break;
> > + }
> > + } else if (request) {
> > + ctd_dprintk_crit("cmd %p timeout completed io_state
> %x\n",
> > + cmd, request->io_state);
> > +
> > + /* remove the old IO context from the
> requeued_io_list */
> > + list_del(&request->list);
> > +
> > + /*
> > + * break the context between the cmnd and the
> request and
> > + * request on the requeue_io_list cannot be reused
> until
> > + * server replies for the same
> > + */
> > + request->cmnd = NULL;
> > + cmd->host_scribble = NULL;
> > +
> > + /* error propagation to the SCSI midlayer */
> > + scsi_translate_sam_code(cmd,
> SAM_STAT_TASK_ABORTED);
> > + scsi_set_resid(cmd, scsi_bufflen(cmd));
> > +
> > + /* we can deallocate the context only once we receive
> > + * any reply from the server
> > + */
> > + request->io_state =
> CTD_IO_REQUEST_REPLY_AWAITED;
> > +
> > + /* indicate no more requeue of this particular IO is
> needed */
> > + error = BLK_EH_HANDLED;
> > + } else {
> > + ctd_dprintk_crit(
> > + "cmnd -> %p request -> NULL error !!!\n",
> cmd);
> > + }
> > +
> > + spin_unlock_irqrestore(&ctd_private->io_mgmt_lock, flags);
> > +
> > + return error;
> > +}
> > +
> > +
> > +static int
> > +ctd_ITnexus_handler(struct ctd_pci_private *ctd_private)
> > +{
> > + int i;
> > + int error;
> > + struct ctd_target_info *ctd_target;
> > + struct ctd_host_info *ctd_host;
> > +
> > + error = 0;
> > +
> > + ctd_host = (struct ctd_host_info *)ctd_private->host_private;
> > +
> > + ctd_dprintk_crit("ctd_private -> %p\n", ctd_private);
> > +
> > + for (i = 0; i < EMCCTD_MAX_ID; i++) {
> > + union emc_ctd_v010_message ctd_message;
> > + struct emc_ctd_v010_detect *ctd_detect;
> > +
> > + ctd_target = &ctd_host->target[i];
> > +
> > + switch (ctd_target->detect_completed) {
> > +
> > + case EMCCTD_TARGET_DETECT_NOT_COMPLETED:
> > + if (!ctd_target-
> >ctd_detect.emc_ctd_v010_detect_flags)
> > + break;
> > +
> > + /* The id defined by the SCSI Midlayer should
> match the
> > + * index as this routine is indirectly invoked by
> the
> > + * delayed work mechanism
> > + */
> > +
> > + ctd_dprintk_crit("ctd_target -> %p index =
> %x\n",
> > + ctd_target, i);
> > + ctd_dprintk_crit("key -> %llx header -> %x\n",
> > + ctd_target-
> >ctd_detect.emc_ctd_v010_detect_key,
> > + ctd_target-
> >ctd_detect.emc_ctd_detect_header_address);
> > +
> > + memset(&ctd_message, 0x0,
> > + sizeof(union
> emc_ctd_v010_message));
> > +
> > + ctd_detect =
> &ctd_message.emc_ctd_v010_message_detect;
> > + ctd_detect->emc_ctd_v010_detect_flags =
> 0x0;
> > + ctd_detect->emc_ctd_v010_detect_key =
> > + ctd_target-
> >ctd_detect.emc_ctd_v010_detect_key;
> > + ctd_detect->emc_ctd_detect_header_what =
> > + EMC_CTD_V010_WHAT_DETECT;
> > + ctd_detect->emc_ctd_detect_header_minor =
> > +
> EMCCTD_V010_PROTOCOL_MINOR_VERSION;
> > + ctd_detect-
> >emc_ctd_detect_header_address =
> > + ctd_target-
> >ctd_detect.emc_ctd_detect_header_address;
> > +
> > + if (ctd_hw_enqueue_request(&ctd_message,
> > + ctd_private) ==
> SUCCESS) {
> > + ctd_dprintk_crit("ctd_target -> %p\n",
> > + ctd_target);
> > + ctd_target->detect_completed =
> > +
> EMCCTD_TARGET_DETECT_COMPLETED;
> > +
> > + atomic_long_inc(
> > + &ctd_private-
> >hw_stats.what_out);
> > + } else {
> > + ctd_dprintk_crit(
> > + "ctd_target -> %p
> ctd_hw_enqueue_request failure\n",
> > + ctd_target);
> > + error = -EAGAIN;
> > + break;
> > + }
> > +
> > + case EMCCTD_TARGET_DETECT_COMPLETED:
> > + /* Disconnect case ... we need to remove the
> associated
> > + * objects from SCSI midlayer
> > + */
> > + if (!ctd_target-
> >ctd_detect.emc_ctd_v010_detect_flags) {
> > + ctd_dprintk_crit("ctd_target -> %p\n",
> > + ctd_target);
> > +
> > + ctd_clear_io_queue(ctd_private);
> > +
> > + if (ctd_target->starget) {
> > + /* the following attempts to clean the
> SCSI
> > + * midlayer objects
> > + */
> > + scsi_target_block(
> > + &ctd_target->starget-
> >dev);
> > + scsi_target_unblock(
> > + &ctd_target->starget-
> >dev,
> > +
> SDEV_TRANSPORT_OFFLINE);
> > + /*
> > + * Target object might still be
> active
> > + * in case its not reaped
> completely (as
> > + * with LVM) thus might be
> reused when
> > + * the link reconnects back
> (OPT 443532)
> > + */
> > + scsi_remove_target(
> > + &ctd_target->starget-
> >dev);
> > + } else {
> > + ctd_dprintk_crit(
> > + "starget already
> null\n");
> > + }
> > +
> > + /* declare the link dead and buried */
> > + ctd_target->detect_completed =
> > +
> EMCCTD_TARGET_DETECT_NOT_COMPLETED;
> > + memset(&ctd_target->ctd_detect,
> 0x0,
> > + sizeof(struct
> emc_ctd_v010_detect));
> > +
> > +
> wake_up(&lun_discovery_event_barrier);
> > + }
> > + /* Connect case ... need to scan and create the
> needed
> > + * objects in the SCSI midlayer
> > + */
> > + else {
> > + ctd_dprintk_crit("ctd_target -> %p\n",
> > + ctd_target);
> > + scsi_scan_target(&ctd_host->shost-
> >shost_gendev,
> > + 0, i, SCAN_WILD_CARD,
> 1);
> > + lun_discovery_complete = 1;
> > +
> wake_up(&lun_discovery_event_barrier);
> > + }
> > + break;
> > + default:
> > + ctd_dprintk_crit("ctd_target -> %p detect
> unknown -> %x\n",
> > + ctd_target, ctd_target-
> >detect_completed);
> > + }
> > + }
> > +
> > + return error;
> > +}
> > +
> > +/* This function posts the detect event into adapter specific list */
> > +static int
> > +ctd_post_event(union emc_ctd_v010_message *io_msg,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + int error;
> > + struct ctd_event_io_element *event;
> > +
> > + error = -ENOMEM;
> > +
> > + event = (struct ctd_event_io_element *)
> > + kzalloc(sizeof(struct ctd_event_io_element),
> > +
> GFP_ATOMIC);
>
> No cast for kzalloc() return
>
[MS>] Ok sir.
> > + if (event) {
> > + error = 0;
> > + event->io_msg = *io_msg;
> > + spin_lock(&ctd_private->event_io_lock);
> > + list_add_tail(&event->list, &ctd_private-
> >event_io_list);
> > + spin_unlock(&ctd_private->event_io_lock);
> > + } else {
> > + ctd_dprintk_crit("kzalloc failure\n");
>
> Please no out of memory error messages.
>
> > + }
> > + return error;
> > +}
> > +
> > +/* Thread Handler Function. This consumes the events posted into
> its queue, and
> > + * takes respective action
> > + */
> > +static int
> > +ctd_event_handler(void *ctd_thread_args)
> > +{
> > + struct ctd_event_io_element *event;
> > + struct ctd_pci_private *ctd_private;
> > +
> > + ctd_private = (struct ctd_pci_private *)ctd_thread_args;
> > +
> > + while (!kthread_should_stop()) {
> > + schedule_timeout_interruptible(HZ);
> > +
> > + event = NULL;
> > +
> > + spin_lock(&ctd_private->event_io_lock);
> > + if (!list_empty(&ctd_private->event_io_list)) {
> > + event = list_first_entry(&ctd_private-
> >event_io_list,
> > + struct ctd_event_io_element,
> list);
> > + list_del(&event->list);
> > + }
> > + spin_unlock(&ctd_private->event_io_lock);
> > +
> > +
> > + if (event) {
> > + int error;
> > + emc_ctd_uint8_t what;
> > + union emc_ctd_v010_message *io_msg;
> > + struct emc_ctd_v010_detect *io_detect;
> > +
> > + io_msg = &event->io_msg;
> > + what = io_msg-
> >emc_ctd_scsi_message_header_what;
> > +
> > + if (what != EMC_CTD_V010_WHAT_DETECT) {
> > + ctd_dprintk_crit("event -> %p what ->
> %x\n",
> > + event, what);
> > + } else {
> > + error = -ENODEV;
> > + io_detect =
> > + &io_msg-
> >emc_ctd_v010_message_detect;
> > +
> > + if (io_detect-
> >emc_ctd_v010_detect_flags ==
> > + 0x0) {
> > + error =
> ctd_handle_disconnect(
> > + io_detect,
> ctd_private);
> > + } else {
> > + if (io_detect-
> >emc_ctd_v010_detect_flags &
> > +
> EMC_CTD_V010_DETECT_FLAG_SCSI_TARGET) {
> > + ctd_dprintk(
> > + "header addr -
> > %x key -> %llx\n",
> > + io_detect-
> >emc_ctd_detect_header_address,
> > + io_detect-
> >emc_ctd_v010_detect_key);
> > + error =
> ctd_handle_target_addition(io_detect,
> > +
> ctd_private);
> > + }
> > + if (io_detect-
> >emc_ctd_v010_detect_flags &
> > +
> EMC_CTD_V010_DETECT_FLAG_SCSI_INITIATOR) {
> > + ctd_dprintk("\n");
> > + error =
> ctd_handle_source_addition(io_detect,
> > +
> ctd_private);
> > + }
> > + }
> > + if (!error) {
> > + int retry =
> EMCCTD_DETECT_RETRY_MAX;
> > +
> > + error =
> ctd_ITnexus_handler(ctd_private);
> > + /* In case of ITnexus_handler
> failure,
> > + * pause for 2 seconds before
> retrying
> > + * the operation again
> > + */
> > + while (error && retry) {
> > +
> schedule_timeout_interruptible(HZ * 2);
> > + error =
> ctd_ITnexus_handler(ctd_private);
> > + retry--;
> > + } while (error && retry);
> > +
> > + }
> > + }
> > + kfree(event);
> > + }
> > + }
> > + return 0;
> > +}
> > +
> > +static int
> > +ctd_init_event_thread(struct ctd_pci_private *ctd_private)
> > +{
> > + int error;
> > +
> > + INIT_LIST_HEAD(&ctd_private->event_io_list);
> > + spin_lock_init(&ctd_private->event_io_lock);
> > +
> > + /* Create the daemon thread to handle detect requests */
> > + ctd_private->ctd_event_thread =
> kthread_create(ctd_event_handler,
> > + (void *)ctd_private,
> "emcctd_event_thread");
> > + error = (!IS_ERR(ctd_private->ctd_event_thread)) ? 0 : -
> EBUSY;
> > + if (!error) {
> > + wake_up_process(ctd_private->ctd_event_thread);
> > + } else {
> > + ctd_dprintk_crit(
> > + "FAILURE, ctd_private -> %p\n", ctd_private);
> > + }
> > + return error;
> > +}
> > +
> > +static void
> > +ctd_destroy_event_thread(struct ctd_pci_private *ctd_private)
> > +{
> > + if (ctd_private->ctd_event_thread)
> > + kthread_stop(ctd_private->ctd_event_thread);
> > +}
> > +
> > +static void
> > +ctd_init_scsi_host_private(struct Scsi_Host *shost, struct pci_dev
> *pci_dev)
> > +{
> > + int i;
> > + struct ctd_host_info *ctd_host_info;
> > + struct ctd_pci_private *ctd_private;
> > +
> > + ctd_private = pci_get_drvdata(pci_dev);
> > +
> > + ctd_dprintk("ctd_private -> %p\n", ctd_private);
> > +
> > + ctd_host_info = shost_priv(shost);
> > + memset(ctd_host_info, 0x0, sizeof(struct ctd_host_info));
> > + for (i = 0; i < EMCCTD_MAX_ID; i++) {
> > + struct ctd_target_info *ctd_target;
> > +
> > + ctd_target = &ctd_host_info->target[i];
> > + /* nothing to do;
> > + * ctd_target->ctd_detect.emc_ctd_v010_detect_flags
> already zero
> > + */
> > + }
> > +
> > +
> > + ctd_host_info->shost = shost;
> > + ctd_host_info->pci_dev = pci_dev;
> > +
> > + shost->can_queue = ctd_private->pci_request_queue_size;
> > + shost->cmd_per_lun = min(emcctd_cmd_per_lun, shost-
> >can_queue);
> > + shost->max_lun = emcctd_max_luns;
> > + shost->max_id = EMCCTD_MAX_ID;
> > +
> > + ctd_private->host_private = ctd_host_info;
> > +
> > + ctd_dprintk("scsi_ctd_host = %p\n", ctd_host_info);
> > +}
> > +
> > +
> > +static int
> > +ctd_scsi_layer_init(struct pci_dev *pci_dev)
> > +{
> > + int error;
> > + struct Scsi_Host *scsi_ctd_host;
> > + struct ctd_pci_private *ctd_private = NULL;
> > +
> > + ctd_dprintk("pci_dev -> %p\n", pci_dev);
> > +
> > + scsi_ctd_host = scsi_host_alloc(&scsi_ctd_template,
> > + sizeof(struct ctd_host_info));
> > + if (scsi_ctd_host == NULL) {
> > + error = -ENOMEM;
> > + goto ctd_scsi_layer_init_complete;
> return -ENOMEM;
> > + }
> > +
> > + ctd_init_scsi_host_private(scsi_ctd_host, pci_dev);
> > +
> > + ctd_private = pci_get_drvdata(pci_dev);
>
> Maybe:
>
> > +
> > + error = ctd_init_event_thread(ctd_private);
> > + if (error)
> > + goto ctd_scsi_layer_init_complete;
> goto out_put_scsi_host;
> > +
> > + /*
> > + * register the HBA to the Linux SCSI stack
> > + */
> > + error = scsi_add_host(scsi_ctd_host, &pci_dev->dev);
> if (error)
> goto out_destroy_thread;
>
> reutrn 0;
>
> out_put_scsi_host:
> scsi_host_put(scsi_ctd_host);
> out_destroy_thread:
> ctd_destroy_event_thread(ctd_private);
>
> return error;
[MS>] Hmmm... will recheck this
> > +
> > +ctd_scsi_layer_init_complete:
> > + if (error) {
> > + ctd_dprintk_crit("failure, error = %x\n", error);
> > + if (scsi_ctd_host != NULL)
> > + scsi_host_put(scsi_ctd_host);
> > +
> > + if (ctd_private)
> > + ctd_destroy_event_thread(ctd_private);
> > + }
> > + return error;
> > +}
> > +
> > +static void
> > +ctd_clear_io_queue(struct ctd_pci_private *ctd_private)
> > +{
> > + struct list_head iochain;
> > + unsigned long flags;
> > + struct ctd_request_private *request, *request_next;
> > +
> > + ctd_dprintk_crit("ctd_private -> %p\n", ctd_private);
> > +
> > + INIT_LIST_HEAD(&iochain);
> > + spin_lock_irqsave(&ctd_private->io_mgmt_lock, flags);
> > +
> > + /* post reset need to cleanup the aborted io
> > + * as no reply is expected on them
> > + */
> > + /* request is still kept as REPLY_AWAITED to
> > + * handle any response post connect
> > + */
> > + list_for_each_entry_safe(request, request_next,
> > + &ctd_private->aborted_io_list, list) {
> > + list_del(&request->list);
> > + request->io_state =
> CTD_IO_REQUEST_REPLY_AWAITED;
> > + }
> > +
> > + /* rifle thru queued and requeued IO list and mark them for
> abort,
> > + * the completion to the upper layers is handled by the
> timeout logic
> > + * invoked from the SCSI midlayer
> > + */
> > + /* request is still kept as REPLY_AWAITED to handle any
> response post
> > + * connect
> > + */
> > + list_for_each_entry_safe(request, request_next,
> > + &ctd_private->queued_io_list, list) {
> > + list_del(&request->list);
> > + list_add(&request->list, &iochain);
> > + request->cmnd->host_scribble = NULL;
> > + request->io_state =
> CTD_IO_REQUEST_REPLY_AWAITED;
> > +
> > + /* These requests shall be aborted to upper layer, so
> treat them
> > + * as abort_sent
> > + */
> > + atomic_long_inc(&ctd_private->hw_stats.abort_sent);
> > + atomic_long_dec(&ctd_private-
> >hw_stats.active_io_count);
> > + }
> > +
> > + list_for_each_entry_safe(request, request_next,
> > + &ctd_private->requeued_io_list, list) {
> > + list_del(&request->list);
> > + list_add(&request->list, &iochain);
> > + request->cmnd->host_scribble = NULL;
> > + request->io_state =
> CTD_IO_REQUEST_REPLY_AWAITED;
> > +
> > + /* These requests shall be aborted to upper layer, so
> treat them
> > + * as abort_sent
> > + */
> > + atomic_long_inc(&ctd_private->hw_stats.abort_sent);
> > + atomic_long_dec(&ctd_private-
> >hw_stats.active_io_count);
> > + }
> > + spin_unlock_irqrestore(&ctd_private->io_mgmt_lock, flags);
> > +
> > + list_for_each_entry_safe(request, request_next,
> > + &iochain, list) {
> > + struct scsi_cmnd *cmnd;
> > +
> > + list_del(&request->list);
> > +
> > + ctd_dprintk_crit(
> > + "cmnd -> %p request -> %p
> CTD_IO_REQUEST_REPLY_AWAITED\n",
> > + request->cmnd, request);
> > +
> > + cmnd = request->cmnd;
> > + request->cmnd = NULL;
> > +
> > + /* error propagation to the SCSI midlayer */
> > + scsi_translate_sam_code(cmnd,
> SAM_STAT_TASK_ABORTED);
> > + scsi_set_resid(cmnd, scsi_bufflen(cmnd));
> > + cmnd->scsi_done(cmnd);
> > + }
> > + ctd_dprintk("ctd_private -> %p\n", ctd_private);
> > +}
> > +
> > +static int
> > +ctd_scsi_layer_cleanup(struct pci_dev *pci_dev)
> > +{
> > + int error;
> > + struct ctd_pci_private *ctd_private;
> > + struct ctd_host_info *ctd_host_info;
> > +
> > + error = 0;
> > +
> > + ctd_private = pci_get_drvdata(pci_dev);
> > +
> > + ctd_dprintk("ctd_private pci_dev -> %p %p\n", ctd_private,
> pci_dev);
> > +
> > + ctd_check_response_queue((unsigned long)pci_dev);
> > +
> > + ctd_clear_io_queue(ctd_private);
> > +
> > + ctd_destroy_event_thread(ctd_private);
> > +
> > + flush_scheduled_work();
> > +
> > + ctd_host_info = ctd_private->host_private;
> > +
> > + scsi_remove_host(ctd_host_info->shost);
> > +
> > + scsi_host_put(ctd_host_info->shost);
> > +
> > + return error;
> > +}
> > +
> > +#ifdef CONFIG_PM
> > +static int
> > +ctd_pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
> > +{
> > + pci_save_state(pci_dev);
> > + pci_set_power_state(pci_dev, PCI_D3hot);
> > + return 0;
> > +}
> > +
> > +static int
> > +ctd_pci_resume(struct pci_dev *pci_dev)
> > +{
> > + pci_restore_state(pci_dev);
> > + pci_set_power_state(pci_dev, PCI_D0);
> > + return 0;
> > +}
> > +#endif
> > +
> > +static void
> > +ctd_pci_remove(struct pci_dev *pci_dev)
> > +{
> > + struct ctd_pci_private *ctd_private;
> > +
> > + ctd_dprintk("pic_dev -> %p\n", pci_dev);
> > +
> > + ctd_private = pci_get_drvdata(pci_dev);
> > +
> > + ctd_private->hw_state = CTD_HW_STATE_DISABLED;
> > +
> > + ctd_scsi_layer_cleanup(pci_dev);
> > +
> > +#if !defined(__VMKLNX__)
> > + ctd_proc_remove(pci_dev);
> > +#endif
> > + free_irq(pci_dev->irq, pci_dev);
> > +
> > + pci_disable_msi(pci_dev);
> > +
> > + if (ctd_private->ioaddr_txrx_rings)
> > + pci_iounmap(pci_dev, ctd_private-
> >ioaddr_txrx_rings);
> > +
> > + if (ctd_private->ioaddr_fast_registers)
> > + pci_iounmap(pci_dev, ctd_private-
> >ioaddr_fast_registers);
> > +
> > + if (ctd_private->ioaddr_slow_registers)
> > + pci_iounmap(pci_dev, ctd_private-
> >ioaddr_slow_registers);
> > +
> > + tasklet_kill(&ctd_private->isr_tasklet);
> > +
> > + ctd_release_io_pool(ctd_private);
> > +
> > + kfree(ctd_private);
> > +
> > + pci_release_regions(pci_dev);
> > + pci_set_drvdata(pci_dev, NULL);
> > + pci_disable_device(pci_dev);
> > +}
> > +
> > +static void
> > +ctd_check_error_condition(struct pci_dev *pci_dev)
> > +{
> > +#define EMCCTD_MAX_CACHED_ERROR 14
> > + int i, j;
> > + int error;
> > + union emc_ctd_v010_message message;
> > + static emc_ctd_uint32_t
> internal_errors_1_14[EMCCTD_MAX_CACHED_ERROR];
> > + struct ctd_pci_private *ctd_private =
> pci_get_drvdata(pci_dev);
> > +
> > + if (ctd_private->pci_fast_registers-
> >emc_ctd_v010_fregs_error_flag) {
> > + for (i = 0; i < EMCCTD_MAX_CACHED_ERROR; i++) {
> > + if (internal_errors_1_14[i] !=
> > + ctd_private->pci_fast_registers-
> >emc_ctd_v010_fregs_errors_1_14[i]) {
> > +
> > + internal_errors_1_14[i] =
> > + ctd_private-
> >pci_fast_registers->emc_ctd_v010_fregs_errors_1_14[i];
> > +
> > + error = i + 1;
> > +
> > + for (j = 0; j <
> EMC_CTD_V010_LOG_ERROR_TX_SIZE; j++) {
> > + if (ctd_private-
> >pci_fast_registers->emc_ctd_v010_fregs_log_error_tx_error[j] ==
> > + error) {
> > + memcpy(&message,
> > + &ctd_private-
> >pci_fast_registers->emc_ctd_v010_fregs_log_error_tx_message[j],
> > +
> sizeof(message));
> > + ctd_dprintk_crit(
> > + "header addr -
> > %x error -> %s\n",
> > +
> message.emc_ctd_scsi_message_header_address,
> > + (error ==
> > +
> EMC_CTD_V010_ERROR_TX_CHANNEL_DISCONNECTED ?
> > +
> "EMC_CTD_V010_ERROR_TX_CHANNEL_DISCONNECTED" :
> > + error
> ==
> > +
> EMC_CTD_V010_ERROR_TX_MESSAGE_WHAT ?
> > +
> "EMC_CTD_V010_ERROR_TX_MESSAGE_WHAT" :
> > + error
> ==
> > +
> EMC_CTD_V010_ERROR_TX_MESSAGE_RESERVED ?
> > +
> "EMC_CTD_V010_ERROR_TX_MESSAGE_RESERVED" :
> > + error
> ==
> > +
> EMC_CTD_V010_ERROR_TX_MESSAGE_ORDER ?
> > +
> "EMC_CTD_V010_ERROR_TX_MESSAGE_ORDER" :
> > + error
> ==
> > +
> EMC_CTD_V010_ERROR_TX_ENDPOINT_TYPE ?
> > +
> "EMC_CTD_V010_ERROR_TX_ENDPOINT_TYPE" :
> > + error
> ==
> > +
> EMC_CTD_V010_ERROR_TX_OPAQUE_RX_UNKNOWN ?
> > +
> "EMC_CTD_V010_ERROR_TX_OPAQUE_RX_UNKNOWN" :
> > +
> "EMC_CTD_V010_ERROR_NULL"));
> > + }
> > + }
> > + }
> > + }
> > + }
> > +}
> > +/*
> > + * ctd_check_response_queue
> > + *
> > + * Bottom half of interrupt handler.
> > + */
> > +static void
> > +ctd_check_response_queue(unsigned long instance_addr)
> > +{
> > + struct pci_dev *pci_dev = (struct pci_dev *)instance_addr;
> > + struct ctd_pci_private *ctd_private =
> pci_get_drvdata(pci_dev);
> > + union emc_ctd_v010_message io_response;
> > +
> > +
> > + /* empty response queue */
> > + while (ctd_hw_dequeue_response(&io_response,
> ctd_private) ==
> > + SUCCESS) {
> > + /* handle the response */
> > + ctd_handle_response(&io_response,
> ctd_private);
> > + }
> > +}
> > +
> > +
> > +static irqreturn_t
> > +ctd_isr(int irq, void *opaque)
> > +{
> > + struct pci_dev *pci_dev = (struct pci_dev *)opaque;
> > + struct ctd_pci_private *ctd_private =
> pci_get_drvdata(pci_dev);
> > +
> > + atomic_long_inc(&ctd_private->hw_stats.interrupts);
> > +
> > + /* schedule work for later */
> > + tasklet_schedule(&ctd_private->isr_tasklet);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int
> > +ctd_request_msi(struct pci_dev *pci_dev)
> > +{
> > + int err = -EFAULT;
> > +
> > + if (pci_dev->irq) {
> > + err = pci_enable_msi(pci_dev);
> > + if (!err) {
> > + err = request_irq(pci_dev->irq, ctd_isr,
> > + IRQF_SHARED,
> > + pci_name(pci_dev), pci_dev);
> > + if (err < 0) {
> > + ctd_dprintk_crit("request_irq failure
> !!!\n");
> > + pci_disable_msi(pci_dev);
> > + err = -EBUSY;
> > + }
> > + }
> > + }
> > + return err;
> > +}
> > +
> > +static struct ctd_request_private *
> > +ctd_acquire_request(struct ctd_pci_private *ctd_private)
> > +{
> > + unsigned long flags;
> > + struct ctd_request_private *ctd_request;
> > +
> > + ctd_request = NULL;
> > +
> > + spin_lock_irqsave(&ctd_private->io_mgmt_lock, flags);
> > +
> > + /* check if any request in the aborted io list can be reused */
> > + if (!list_empty(&ctd_private->aborted_io_list)) {
> > + struct ctd_request_private *request, *request_next;
> > +
> > + list_for_each_entry_safe(request, request_next,
> > + &ctd_private->aborted_io_list,
> list) {
> > + /* aborted_io_list is in chronologically order
> thus
> > + * failure of time_after() indicates any request
> after
> > + * this point is not in the kill zone
> > + */
> > + if (time_before(jiffies, request-
> >purge_lifetime))
> > + break;
> > +
> > + list_del(&request->list);
> > + if (request->cdb_page) {
> > + __free_pages(request->cdb_page,
> > + request-
> >cdb_page_order);
> > + }
> > + if (request->sgllist_page) {
> > + __free_pages(request->sgllist_page,
> > + request-
> >sgllist_page_order);
> > + }
> > + memset(request, 0x0,
> > + sizeof(struct
> ctd_request_private));
> > + list_add(&request->list, &ctd_private-
> >io_pool);
> > + atomic_long_inc(&ctd_private-
> >hw_stats.free_io_entries);
> > + }
> > + }
> > +
> > + if (!list_empty(&ctd_private->io_pool)) {
> > + ctd_request = list_first_entry(&ctd_private->io_pool,
> > + struct ctd_request_private,
> list);
> > + list_del(&ctd_request->list);
> > + ctd_request->io_state = CTD_IO_REQUEST_QUEUED;
> > + }
> > +
> > + if (ctd_request)
> > + atomic_long_dec(&ctd_private-
> >hw_stats.free_io_entries);
> > +
> > + spin_unlock_irqrestore(&ctd_private->io_mgmt_lock, flags);
> > +
> > + return ctd_request;
> > +}
> > +
> > +static void
> > +ctd_release_request(struct ctd_request_private *ctd_request,
> > + struct ctd_pci_private *ctd_private)
> > +{
> > + unsigned long flags;
> > +
> > + spin_lock_irqsave(&ctd_private->io_mgmt_lock, flags);
> > + memset(ctd_request, 0x0, sizeof(struct
> ctd_request_private));
> > + list_add(&ctd_request->list, &ctd_private->io_pool);
> > +
> > + atomic_long_inc(&ctd_private->hw_stats.free_io_entries);
> > +
> > + spin_unlock_irqrestore(&ctd_private->io_mgmt_lock, flags);
> > +}
> > +
> > +static void
> > +ctd_release_io_pool(struct ctd_pci_private *ctd_private)
> > +{
> > + kfree(ctd_private->io_map);
> > +}
> > +
> > +static int
> > +ctd_alloc_io_pool(struct ctd_pci_private *ctd_private, unsigned int
> pool_size)
> > +{
> > + int i;
> > + int error;
> > +
> > + error = -ENOMEM;
> > +
> > + INIT_LIST_HEAD(&ctd_private->io_pool);
> > + INIT_LIST_HEAD(&ctd_private->queued_io_list);
> > + INIT_LIST_HEAD(&ctd_private->aborted_io_list);
> > + INIT_LIST_HEAD(&ctd_private->requeued_io_list);
> > +
> > + spin_lock_init(&ctd_private->io_mgmt_lock);
> > +
> > + ctd_private->io_map = kcalloc(pool_size,
> > + sizeof(struct ctd_request_private),
> GFP_KERNEL);
> > +
> > + /*
> > + * in case of allocation failure try with one fourth the size
> before
> > + * throwing the towel
> > + */
> > +
> > + if (ctd_private->io_map == NULL) {
> > + pool_size = pool_size >> 2;
> > + ctd_private->io_map = kcalloc(pool_size,
> > + sizeof(struct ctd_request_private),
> GFP_KERNEL);
> > + if (ctd_private->io_map == NULL) {
> > + ctd_dprintk_crit(
> > + "io_pool allocation failure for pool_size
> -> %d\n",
> > + pool_size);
>
> No OOM messages.
[MS>] Just wanted to have a personalized OOM message... to take care of debugging... Will handle it other way round
>
> > + goto ctd_alloc_io_pool_complete;
> > + }
> > + }
> > +
> > + ctd_private->io_map_end = ctd_private->io_map + pool_size;
> > +
> > + for (i = 0; i < pool_size; i++) {
> > + struct ctd_request_private *request_context =
> > + ctd_private->io_map +
> i;
> > + memset(request_context, 0x0,
> > + sizeof(struct ctd_request_private));
> > + list_add(&request_context->list, &ctd_private-
> >io_pool);
> > + }
> > + ctd_dprintk_crit(
> > + "ctd_private -> %p, pool_size -> %x, io_map -> %p,
> io_map_end-> %p\n",
> > + ctd_private, pool_size,
> > + ctd_private->io_map, ctd_private-
> >io_map_end);
> > + error = 0;
> > + ctd_private->hw_stats.free_io_entries.counter = pool_size;
> > +ctd_alloc_io_pool_complete:
> > + return error;
> > +}
> > +
> > +static int
> > +ctd_pci_probe(
> > + struct pci_dev *pci_dev,
> > + const struct pci_device_id *id
> > +)
> > +{
> > + struct ctd_pci_private *ctd_private;
> > + int ctd_proc_initialized;
> > + int ctd_scsi_initialized;
> > + int ctd_regions_initialized;
> > + int err;
> > +
> > + err = -ENODEV;
> > + ctd_proc_initialized = FAILED;
> > + ctd_scsi_initialized = FAILED;
> > + ctd_regions_initialized = FAILED;
> > +
> > + ctd_private = (struct ctd_pci_private *)
> > + kzalloc(sizeof(struct ctd_pci_private),
> GFP_ATOMIC);
> > +
> > + if (ctd_private == NULL) {
> > + ctd_dprintk_crit("kzalloc Failure\n");
> > + goto ctd_pci_probe_complete;
> > + }
>
> No cast and no OOM messages.
[MS>] Fine.
>
> > +
> > + ctd_private->pci_dev = pci_dev;
> > +
> > + /* enable the device */
> > + err = pci_enable_device(pci_dev);
> > + if (err) {
> > + ctd_dprintk_crit("pci_enable_device Failure\n");
>
> I'd prefere dev_err() here, as you'll have the information which device
> enable
> failed.
[MS>] ok
>
> > + goto ctd_pci_probe_complete;
> > + }
> > + pci_set_master(pci_dev);
> > +
> > + err = pci_request_regions(pci_dev, "ctd-pci");
> > + if (err) {
> > + ctd_dprintk_crit("pci_request_regions Failure\n");
>
> Same here.
>
> > + goto ctd_pci_probe_complete;
> > + }
> > +
> > + ctd_regions_initialized = SUCCESS;
> > +
> > + ctd_dprintk("ctd_private pci_dev -> %p %p\n", ctd_private,
> pci_dev);
> > +
> > +#define EMC_CTD_TXRX_MSG_SIZE 128
> > +
> > + if (pci_resource_start(pci_dev, EMC_CTD_V010_BAR_RINGS))
> {
> > + ctd_private->ioaddr_txrx_rings = ioremap(
> > + pci_resource_start(pci_dev,
> > + EMC_CTD_V010_BAR_RINGS),
> > + pci_resource_len(pci_dev,
> > + EMC_CTD_V010_BAR_RINGS)
> > + );
> > + ctd_private->txrx_ringsize =
> > + (pci_resource_len(pci_dev,
> > + EMC_CTD_V010_BAR_RINGS) >> 1)
> > + / EMC_CTD_TXRX_MSG_SIZE;
> > +
> > + ctd_dprintk_crit(
> > + "physical addr = %llx ioaddr_txrx_rings = %p ,
> ring size = %x\n",
> > + pci_resource_start(pci_dev,
> > + EMC_CTD_V010_BAR_RINGS),
> > + ctd_private->ioaddr_txrx_rings,
> > + ctd_private->txrx_ringsize);
> > +
> > + }
> > + if (ctd_private->ioaddr_txrx_rings == NULL) {
> > + err = -ENOMEM;
> > + ctd_dprintk_crit("ioremap failure\n");
> > + goto ctd_pci_probe_complete;
> > + } else {
> > + ctd_private->pci_request_array = ctd_private-
> >ioaddr_txrx_rings;
> > + ctd_private->pci_response_array =
> > + ctd_private->ioaddr_txrx_rings +
> > + ((pci_resource_len(pci_dev,
> > +
> EMC_CTD_V010_BAR_RINGS)) >> 1);
> > + }
> > +
> > +
> > + if (pci_resource_start(pci_dev, EMC_CTD_V010_BAR_FREGS))
> {
> > + ctd_private->ioaddr_fast_registers =
> > + ioremap(pci_resource_start(pci_dev,
> > + EMC_CTD_V010_BAR_FREGS),
> > + pci_resource_len(pci_dev,
> > + EMC_CTD_V010_BAR_FREGS));
> > +
> > + ctd_dprintk_crit(
> > + "physical addr = %llx ioaddr_fast_registers =
> %p\n",
> > + pci_resource_start(pci_dev,
> > + EMC_CTD_V010_BAR_FREGS),
> > + ctd_private->ioaddr_fast_registers);
> > + }
> > + if (ctd_private->ioaddr_fast_registers == NULL) {
> > + err = -ENOMEM;
> > + ctd_dprintk_crit("ioremap failure\n");
> > + goto ctd_pci_probe_complete;
> > + } else {
> > + ctd_private->pci_fast_registers =
> > + ctd_private->ioaddr_fast_registers;
> > + }
> > +
> > + if (pci_resource_start(pci_dev, EMC_CTD_V010_BAR_SREGS))
> {
> > + ctd_private->ioaddr_slow_registers =
> > + ioremap(pci_resource_start(pci_dev,
> > +
> EMC_CTD_V010_BAR_SREGS),
> > + pci_resource_len(pci_dev,
> > + EMC_CTD_V010_BAR_SREGS));
> > +
> > + ctd_dprintk_crit(
> > + "physical addr = %llx ioaddr_slow_registers =
> %p\n",
> > + pci_resource_start(pci_dev,
> > + EMC_CTD_V010_BAR_SREGS),
> > + ctd_private->ioaddr_slow_registers);
> > + }
> > + if (ctd_private->ioaddr_slow_registers == NULL) {
> > + err = -ENOMEM;
> > + ctd_dprintk_crit("ioremap failure\n");
> > + goto ctd_pci_probe_complete;
> > + } else {
> > + ctd_private->pci_slow_registers =
> > + ctd_private->ioaddr_slow_registers;
> > + }
> > +
> > + /* reset the device */
> > + ctd_private->pci_device_reset_register = 0XFF;
> > +
> > + ctd_private->pci_request_queue_size = ctd_private-
> >txrx_ringsize;
> > + ctd_private->pci_response_queue_size = ctd_private-
> >txrx_ringsize;
> > +
> > + err = ctd_alloc_io_pool(ctd_private,
> > + ctd_private->pci_request_queue_size);
> > + if (err) {
> > + ctd_dprintk_crit("ctd_alloc_io_pool failure\n");
> > + goto ctd_pci_probe_complete;
> > + }
> > +
> > + pci_set_drvdata(pci_dev, ctd_private);
> > +
> > + spin_lock_init(&ctd_private->isr_lock);
> > +
> > + /* setup tasklet for scanning response queue */
> > + tasklet_init(&ctd_private->isr_tasklet,
> > + ctd_check_response_queue, (unsigned
> long)pci_dev);
> > +
> > + ctd_private->hw_state = CTD_HW_STATE_INITIALIZED;
> > +
> > + pci_set_master(pci_dev);
> > +
> > +#if !defined(__VMKLNX__)
> > + err = ctd_proc_init(pci_dev);
> > + if (err) {
> > + ctd_dprintk_crit("ctd_proc_init failure\n");
> > + goto ctd_pci_probe_complete;
> > + }
> > + ctd_proc_initialized = SUCCESS;
> > +#endif
> > + err = ctd_scsi_layer_init(pci_dev);
> > + if (err) {
> > + ctd_dprintk_crit("ctd_scsi_layer_init failure\n");
> > + goto ctd_pci_probe_complete;
> > + }
> > + ctd_scsi_initialized = SUCCESS;
> > +
> > + err = ctd_request_msi(pci_dev);
> > + if (err) {
> > + ctd_dprintk_crit("ctd_request_msi failure\n");
> > + goto ctd_pci_probe_complete;
> > + }
> > +
> > + /* after we reset the device, but before we enabled MSI,
> some messages
> > + * may have been received. check for them
> > + */
> > + tasklet_schedule(&ctd_private->isr_tasklet);
> > +
> > +ctd_pci_probe_complete:
> > + if (err) {
> > + if (ctd_private) {
> > + tasklet_kill(&ctd_private->isr_tasklet);
> > +
> > + if (ctd_scsi_initialized == SUCCESS)
> > + ctd_scsi_layer_cleanup(pci_dev);
> > +
> > + if (ctd_proc_initialized == SUCCESS)
> > + ctd_proc_remove(pci_dev);
> > +
> > + if (ctd_private->ioaddr_txrx_rings)
> > + pci_iounmap(pci_dev,
> > + ctd_private-
> >ioaddr_txrx_rings);
> > +
> > + if (ctd_private->ioaddr_fast_registers)
> > + pci_iounmap(pci_dev,
> > + ctd_private-
> >ioaddr_fast_registers);
> > +
> > + if (ctd_private->ioaddr_slow_registers)
> > + pci_iounmap(pci_dev,
> > + ctd_private-
> >ioaddr_slow_registers);
> > +
> > + if (ctd_regions_initialized == SUCCESS)
> > + pci_release_regions(pci_dev);
> > +
> > + ctd_release_io_pool(ctd_private);
> > + kfree(ctd_private);
> > + }
> > + pci_set_drvdata(pci_dev, NULL);
> > + pci_disable_device(pci_dev);
> > + }
> > + return err;
> > +}
> > +
> > +#if !defined(__VMKLNX__)
> > +static const struct file_operations ctd_proc_fops = {
> > + .open = ctd_proc_open,
> > + .read = seq_read,
> > + .llseek = seq_lseek,
> > + .release = seq_release,
> > +};
> > +static int
> > +ctd_proc_open(struct inode *inode, struct file *file)
> > +{
> > + return single_open(file, ctd_proc_show, PDE_DATA(inode));
> > +}
> > +
> > +int
> > +ctd_proc_init(struct pci_dev *pci_dev)
> > +{
> > + int err;
> > + static int hw_index;
> > + char hw_name[MAX_PROC_FILE_NAMELEN];
> > + struct ctd_pci_private *ctd_private;
> > + struct proc_dir_entry *pde;
> > +
> > + ctd_private = (struct ctd_pci_private *)
> pci_get_drvdata(pci_dev);
> > + ctd_private->hw_index = hw_index;
> > +
> > + memset(hw_name, 0x0, sizeof(hw_name));
> > + snprintf(hw_name, sizeof(hw_name), "emcctd_stats_%d",
> hw_index++);
> > +
> > + err = -EPERM;
> > +
> > + do {
> > + if (ctd_proc_directory == NULL)
> > + break;
> > + pde = proc_create_data(hw_name, S_IFREG |
> S_IRUGO | S_IWUSR,
> > + ctd_proc_directory,
> > + &ctd_proc_fops,
> > + ctd_private);
> > +
> > + if (pde == NULL) {
> > + ctd_dprintk_crit(
> > + "create_proc_read_entry failure for
> %s\n",
> > + hw_name);
> > + break;
> > + }
> > + err = 0;
> > + } while (0);
> > + return err;
> > +}
> > +
> > +void
> > +ctd_proc_remove(struct pci_dev *pci_dev)
> > +{
> > + int hw_index;
> > + char hw_name[MAX_PROC_FILE_NAMELEN];
> > + struct ctd_pci_private *ctd_private;
> > +
> > + ctd_private = (struct ctd_pci_private *)
> pci_get_drvdata(pci_dev);
> > +
> > + hw_index = ctd_private->hw_index;
> > + memset(hw_name, 0x0, sizeof(hw_name));
> > + snprintf(hw_name, sizeof(hw_name),
> "emc/emcctd_stats_%d", hw_index);
> > +
> > + ctd_dprintk("removing %s\n", hw_name);
> > +
> > + remove_proc_entry(hw_name, NULL);
> > +
> > +}
> > +#endif
> > +
> > +static int __init ctd_pci_init(void)
> > +{
> > + int err;
> > +
> > + ctd_dprintk_crit("Loading emcctd\n");
> > + init_waitqueue_head(&lun_discovery_event_barrier);
> > +
> > + ctd_proc_directory = proc_mkdir("emc", NULL);
> > +
> > + err = pci_register_driver(&ctd_pci_driver);
> > +
> > + if (err) {
> > + remove_proc_entry("emc", NULL);
> > + } else {
> > + /* wait for 20 seconds or less to allow the luns to
> appear
> > + * before exiting from insmod
> > + */
> > +
> wait_event_interruptible_timeout(lun_discovery_event_barri
> er,
> > + lun_discovery_complete, ((HZ)
> * 20));
> > + }
> > +
> > + return err;
> > +}
> > +
> > +module_init(ctd_pci_init);
> > +
> > +static void __exit ctd_pci_exit(void)
> > +{
> > + pci_unregister_driver(&ctd_pci_driver);
> > + remove_proc_entry("emc", NULL);
> > +}
> > +
> > +module_exit(ctd_pci_exit);
> > diff --git a/drivers/scsi/emcctd/emcctd.h
> b/drivers/scsi/emcctd/emcctd.h
> > new file mode 100644
> > index 0000000..3fba931
> > --- /dev/null
> > +++ b/drivers/scsi/emcctd/emcctd.h
> > @@ -0,0 +1,232 @@
> > +/*
> > + * EMCCTD: EMC Cut-Through HBA Driver for SCSI subsystem.
> > + *
> > + * Copyright (C) 2015 by EMC Corporation, Hopkinton, MA.
> > + *
> > + * Authors:
> > + * fredette, matt <matt.fredette@xxxxxxx>
> > + * Pirotte, Serge <serge.pirotte@xxxxxxx>
> > + * Singh Animesh <Animesh.Singh@xxxxxxx>
> > + * Singhal, Maneesh <Maneesh.Singhal@xxxxxxx>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License
> > + * as published by the Free Software Foundation; either version 2
> > + * of the License, or (at your option) any later version.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied
> warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
> the
> > + * GNU General Public License for more details.
> > + *
> > + */
> > +
> > +#ifndef _EMCCTD_H_
> > +#define _EMCCTD_H_
> > +
> > +#define DRV_NAME "emcctd"
> > +
> > +#define EMCCTD_V010_PROTOCOL_MINOR_VERSION 0x0
> > +
> > +/* please refer to emc_ctd_v010_scsi_command_cdb in
> emc_ctd_interface.h */
> > +#define EMCCTD_V010_MAX_CDB_SIZE 16
> > +
> > +#define EMCCTD_MAX_LUN 16384
> > +#define EMCCTD_MAX_ID 16
> > +#define EMCCTD_MAX_RETRY 5
> > +#define EMCCTD_CMD_PER_LUN 16
> > +#define EMCCTD_THIS_ID (-1)
> > +#define EMCCTD_REQUEST_TIMEOUT (60 * HZ)
> > +#define EMCCTD_OPAQUE_PURGE_WAITTIME (10 * HZ)
> > +
> > +#define EMCCTD_DEVICE_RESET_PAUSE 3
> > +#define EMCCTD_DETECT_RETRY_MAX 3
> > +
> > +#define ctd_dprintk(__m_fmt, ...) \
> > +do { \
> > + if (ctd_debug) \
> > + pr_info("%s:%d:"__m_fmt, __func__, __LINE__,
> ##__VA_ARGS__); \
> > +} while (0)
> > +
> > +#define ctd_dprintk_crit(__m_fmt, ...) \
> > + pr_crit("%s:%d:"__m_fmt, __func__, __LINE__,
> ##__VA_ARGS__)
> > +
> > +#define EMCCTD_TARGET_DETECT_COMPLETED 1
> > +#define EMCCTD_TARGET_DETECT_NOT_COMPLETED 0
> > +
> > +struct ctd_target_info {
> > + unsigned int detect_completed;
> > + struct scsi_target *starget;
> > + struct emc_ctd_v010_detect ctd_detect;
> > +};
> > +
> > +#define emc_ctd_detect_header_address \
> > +
> emc_ctd_v010_detect_header.emc_ctd_v010_header_addres
> s
> > +#define emc_ctd_detect_header_minor \
> > +
> emc_ctd_v010_detect_header.emc_ctd_v010_header_minor
> > +#define emc_ctd_detect_header_what \
> > +
> emc_ctd_v010_detect_header.emc_ctd_v010_header_what
> > +
> > +#define emc_ctd_scsi_command_header_address \
> > +
> emc_ctd_v010_scsi_command_header.emc_ctd_v010_header
> _address
> > +#define emc_ctd_scsi_command_header_minor \
> > +
> emc_ctd_v010_scsi_command_header.emc_ctd_v010_header
> _minor
> > +#define emc_ctd_scsi_command_header_what \
> > +
> emc_ctd_v010_scsi_command_header.emc_ctd_v010_header
> _what
> > +
> > +#define emc_ctd_scsi_response_header_address \
> > +
> emc_ctd_v010_scsi_response_header.emc_ctd_v010_header
> _address
> > +#define emc_ctd_scsi_response_header_minor \
> > +
> emc_ctd_v010_scsi_response_header.emc_ctd_v010_header
> _minor
> > +#define emc_ctd_scsi_response_header_what \
> > +
> emc_ctd_v010_scsi_response_header.emc_ctd_v010_header
> _what
> > +
> > +#define emc_ctd_scsi_phase_header_address \
> > +
> emc_ctd_v010_scsi_phase_header.emc_ctd_v010_header_ad
> dress
> > +#define emc_ctd_scsi_phase_header_minor \
> > +
> emc_ctd_v010_scsi_phase_header.emc_ctd_v010_header_mi
> nor
> > +#define emc_ctd_scsi_phase_header_what \
> > +
> emc_ctd_v010_scsi_phase_header.emc_ctd_v010_header_w
> hat
> > +
> > +#define emc_ctd_scsi_message_header_address \
> > +
> emc_ctd_v010_message_header.emc_ctd_v010_header_addr
> ess
> > +#define emc_ctd_scsi_message_header_minor \
> > +
> emc_ctd_v010_message_header.emc_ctd_v010_header_min
> or
> > +#define emc_ctd_scsi_message_header_what \
> > +
> emc_ctd_v010_message_header.emc_ctd_v010_header_wha
> t
> > +
> > +#define emc_ctd_scsi_command_sgl \
> > +
> emc_ctd_v010_scsi_command_u.emc_ctd_v010_scsi_comma
> nd_sgl
> > +#define emc_ctd_scsi_response_extra \
> > +
> emc_ctd_v010_scsi_response_u.emc_ctd_v010_scsi_respons
> e_extra
> > +
> > +#define ctd_detect_name_bytes \
> > +
> ctd_detect.emc_ctd_v010_detect_name.emc_ctd_v010_nam
> e_bytes
> > +
> > +struct ctd_host_info {
> > + struct Scsi_Host *shost;
> > + struct pci_dev *pci_dev;
> > + struct ctd_target_info target[EMCCTD_MAX_ID];
> > +};
> > +
> > +struct ctd_dev_info {
> > + struct ctd_host_info *ctd_host;
> > + struct ctd_target_info *ctd_target;
> > + struct emc_ctd_v010_detect *ctd_target_detect;
> > +};
> > +
> > +#define PROC_STAT_SCSI_TS_MAX 10
> > +#define MAX_PROC_FILE_NAMELEN 128
> > +#define CTD_MAX_IO_STATS 200
> > +
> > +struct ctd_hw_stats {
> > + atomic_long_t interrupts;
> > + atomic_long_t requests_sent;
> > + atomic_long_t responses_received;
> > + atomic_long_t active_io_count;
> > + atomic_long_t abort_sent;
> > + atomic_long_t abort_received;
> > + atomic_long_t what_in;
> > + atomic_long_t what_out;
> > + atomic_long_t free_io_entries;
> > + unsigned long long io_stats[CTD_MAX_IO_STATS];
> > + unsigned int io_stats_index;
> > +};
> > +
> > +enum ctd_io_request_state {
> > + CTD_IO_REQUEST_FREE,
> > + CTD_IO_REQUEST_QUEUED,
> > + CTD_IO_REQUEST_REQUEUED,
> > + CTD_IO_REQUEST_ABORTED,
> > + CTD_IO_REQUEST_COMPLETED,
> > + CTD_IO_REQUEST_REPLY_AWAITED,
> > + CTD_IO_REQUEST_INVALID
> > +};
> > +
> > +enum ctd_hw_state {
> > + CTD_HW_STATE_UNINITIALIZED,
> > + CTD_HW_STATE_INITIALIZED,
> > + CTD_HW_STATE_UNDER_RESET,
> > + CTD_HW_STATE_DISABLED,
> > + CTD_HW_STATE_INVALID
> > +};
> > +
> > +struct ctd_request_private {
> > + struct list_head list;
> > + enum ctd_io_request_state io_requeue_state;
> > + unsigned int io_timeout;
> > + enum ctd_io_request_state io_state;
> > + struct scsi_cmnd *cmnd;
> > + struct page *cdb_page;
> > + unsigned int cdb_page_order;
> > + struct page *sgllist_page;
> > + unsigned int sgllist_page_order;
> > + unsigned long purge_lifetime;
> > + unsigned long long io_start_time;
> > +};
> > +
> > +struct ctd_pci_private {
> > + struct pci_dev *pci_dev;
> > + void *host_private;
> > +
> > + void __iomem *ioaddr_txrx_rings;
> > + void __iomem *ioaddr_fast_registers;
> > + void __iomem *ioaddr_slow_registers;
> > +
> > + emc_ctd_uint32_t txrx_ringsize;
> > + emc_ctd_uint32_t pci_request_queue_size;
> > + emc_ctd_uint32_t pci_response_queue_size;
> > + struct emc_ctd_v010_fregs *pci_fast_registers;
> > + struct emc_ctd_v010_sregs *pci_slow_registers;
> > + union emc_ctd_v010_message *pci_response_array;
> > + union emc_ctd_v010_message *pci_request_array;
> > +
> > + struct tasklet_struct isr_tasklet;
> > + spinlock_t isr_lock;
> > + unsigned int hw_index;
> > + struct ctd_hw_stats hw_stats;
> > + enum ctd_hw_state hw_state;
> > + struct list_head queued_io_list;
> > + struct list_head aborted_io_list;
> > + struct list_head requeued_io_list;
> > + struct list_head io_pool;
> > + struct ctd_request_private *io_map;
> > + struct ctd_request_private *io_map_end;
> > + spinlock_t io_mgmt_lock;
> > +
> > + struct task_struct *ctd_event_thread;
> > + struct list_head event_io_list;
> > + spinlock_t event_io_lock;
> > +};
> > +
> > +#define request_producer_index \
> > + pci_fast_registers-
> >emc_ctd_v010_fregs_tx_index_producer
> > +#define request_consumer_index \
> > + pci_fast_registers-
> >emc_ctd_v010_fregs_tx_index_consumer
> > +#define response_producer_index \
> > + pci_fast_registers-
> >emc_ctd_v010_fregs_rx_index_producer
> > +#define response_consumer_index \
> > + pci_fast_registers-
> >emc_ctd_v010_fregs_rx_index_consumer
> > +#define pci_device_reset_register \
> > + pci_slow_registers->emc_ctd_v010_sregs_reset
> > +
> > +#define pci_device_name_bytes \
> > + pci_fast_registers-
> >emc_ctd_v010_fregs_device_name.emc_ctd_v010_name_bytes
> > +
> > +struct ctd_event_io_element {
> > + struct list_head list;
> > + union emc_ctd_v010_message io_msg;
> > +};
> > +
> > +static inline unsigned long long ctd_read_tsc(void)
> > +{
> > + unsigned long long local_tsc;
> > +
> > + local_tsc = rdtsc();
> > +
> > + return local_tsc;
> > +}
> > +
> > +#endif /* _EMCCTD_H_ */
> > +
> > +/* vi: set ts=8 sw=8 noet: */
> > --
> > 1.8.5.2
> >
> > --
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> > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > More majordomo info at http://vger.kernel.org/majordomo-
> info.html
>
> --
> Johannes Thumshirn Storage
> jthumshirn@xxxxxxx +49 911 74053 689
> SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
> GF: Felix Imendörffer, Jane Smithard, Graham Norton
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