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

From: Johannes Thumshirn
Date: Tue Jan 19 2016 - 11:04:58 EST

Next message: Holger Schurig: "Re: [LINUX PATCH 5/5] mmc: host: Update the quirks for this controller."
Previous message: Marc Dionne: "Re: Crash with SO_REUSEPORT and ef456144da8ef507c8cf504284b6042e9201a05c"
In reply to: kbuild test robot: "Re: [PATCH] drivers/scsi/emcctd: drivers/scsi/emcctd: Client driver implementation for EMC-Symmetrix GuestOS emulated Cut-Through Device"
Next in thread: Singhal, Maneesh: "RE: [PATCH] drivers/scsi/emcctd: drivers/scsi/emcctd: Client driver implementation for EMC-Symmetrix GuestOS emulated Cut-Through Device"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

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_IMMEDIATE_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_IMMEDIATE_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_LOG_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.

> +
> + 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.

> +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_minor =
> + 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);
}

> + 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()

> + 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?

> + 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?

> + 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

> + 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;
> +
> +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.

> + 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.

> +
> + 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.

> + 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_barrier,
> + 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_address
> +#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_address
> +#define emc_ctd_scsi_phase_header_minor \
> + emc_ctd_v010_scsi_phase_header.emc_ctd_v010_header_minor
> +#define emc_ctd_scsi_phase_header_what \
> + emc_ctd_v010_scsi_phase_header.emc_ctd_v010_header_what
> +
> +#define emc_ctd_scsi_message_header_address \
> + emc_ctd_v010_message_header.emc_ctd_v010_header_address
> +#define emc_ctd_scsi_message_header_minor \
> + emc_ctd_v010_message_header.emc_ctd_v010_header_minor
> +#define emc_ctd_scsi_message_header_what \
> + emc_ctd_v010_message_header.emc_ctd_v010_header_what
> +
> +#define emc_ctd_scsi_command_sgl \
> + emc_ctd_v010_scsi_command_u.emc_ctd_v010_scsi_command_sgl
> +#define emc_ctd_scsi_response_extra \
> + emc_ctd_v010_scsi_response_u.emc_ctd_v010_scsi_response_extra
> +
> +#define ctd_detect_name_bytes \
> + ctd_detect.emc_ctd_v010_detect_name.emc_ctd_v010_name_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
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> 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
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850

Next message: Holger Schurig: "Re: [LINUX PATCH 5/5] mmc: host: Update the quirks for this controller."
Previous message: Marc Dionne: "Re: Crash with SO_REUSEPORT and ef456144da8ef507c8cf504284b6042e9201a05c"
In reply to: kbuild test robot: "Re: [PATCH] drivers/scsi/emcctd: drivers/scsi/emcctd: Client driver implementation for EMC-Symmetrix GuestOS emulated Cut-Through Device"
Next in thread: Singhal, Maneesh: "RE: [PATCH] drivers/scsi/emcctd: drivers/scsi/emcctd: Client driver implementation for EMC-Symmetrix GuestOS emulated Cut-Through Device"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]