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1. The FreeBSD driver was setting an interrupt coalesce delay of 1000us for reasons that I can only speculate on. This was hurting everything from lame sequential I/O "benchmarks" to legitimate filesystem metadata operations that relied on serialized barrier writes. One of my filesystem tests went from 35s to complete down to 6s. 2. Implemented the Performant transport method. Without the fix in (1), I saw almost no difference. With it, my filesystem tests showed another 5-10% improvement in speed. It was hard to measure CPU utilization in any meaningful way, so it's not clear if there was a benefit there, though there should have been since the interrupt handler was reduced from 2 or more PCI reads down to 1. 3. Implemented MSI-X. Without any docs on this, I was just taking a guess, and it appears to only work with the Performant method. This could be a programming or understanding mistake on my part. While this by itself made almost no difference to performance since the Performant method already eliminated most of the synchronous reads over the PCI bus, it did allow the CISS hardware to stop sharing its interrupt with the USB hardware, which in turn allowed the driver to become decoupled from the Giant-locked USB driver stack. This increased performance by almost 20%. The MSI-X setup was done with 4 vectors allocated, but only 1 vector used since the performant method was told to only use 1 of 4 queues. Fiddling with this might make it work with the simpleq method, not sure. I did not implement MSI since I have no MSI-specific hardware in my test lab. 4. Improved the locking in the driver, trimmed some data structures. This didn't improve test times in any measurable way, but it does look like it gave a minor improvement to CPU usage when many processes/threads were doing I/O in parallel. Again, this was hard to accurately test.
236 lines
6.2 KiB
C
236 lines
6.2 KiB
C
/*-
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* Copyright (c) 2001 Michael Smith
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Driver ioctl interface.
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*
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* Note that this interface is API-compatible with the Linux implementation
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* except as noted, and thus this header bears a striking resemblance to
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* the Linux driver's cciss_ioctl.h.
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*
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*/
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#include <sys/ioccom.h>
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#pragma pack(1)
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typedef struct
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{
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u_int8_t bus;
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u_int8_t dev_fn;
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u_int32_t board_id;
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} cciss_pci_info_struct;
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typedef struct
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{
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u_int32_t delay;
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u_int32_t count;
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} cciss_coalint_struct;
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typedef char NodeName_type[16];
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typedef u_int32_t Heartbeat_type;
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#define CISS_PARSCSIU2 0x0001
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#define CISS_PARCSCIU3 0x0002
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#define CISS_FIBRE1G 0x0100
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#define CISS_FIBRE2G 0x0200
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typedef u_int32_t BusTypes_type;
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typedef char FirmwareVer_type[4];
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typedef u_int32_t DriverVer_type;
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/* passthrough command definitions */
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#define SENSEINFOBYTES 32
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#define CISS_MAX_LUN 16
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#define LEVEL2LUN 1
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#define LEVEL3LUN 0
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/* command status value */
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#define CMD_SUCCESS 0x0000
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#define CMD_TARGET_STATUS 0x0001
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#define CMD_DATA_UNDERRUN 0x0002
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#define CMD_DATA_OVERRUN 0x0003
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#define CMD_INVALID 0x0004
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#define CMD_PROTOCOL_ERR 0x0005
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#define CMD_HARDWARE_ERR 0x0006
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#define CMD_CONNECTION_LOST 0x0007
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#define CMD_ABORTED 0x0008
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#define CMD_ABORT_FAILED 0x0009
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#define CMD_UNSOLICITED_ABORT 0x000A
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#define CMD_TIMEOUT 0x000B
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#define CMD_UNABORTABLE 0x000C
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/* transfer direction */
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#define XFER_NONE 0x00
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#define XFER_WRITE 0x01
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#define XFER_READ 0x02
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#define XFER_RSVD 0x03
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/* task attribute */
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#define ATTR_UNTAGGED 0x00
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#define ATTR_SIMPLE 0x04
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#define ATTR_HEADOFQUEUE 0x05
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#define ATTR_ORDERED 0x06
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#define ATTR_ACA 0x07
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/* CDB type */
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#define TYPE_CMD 0x00
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#define TYPE_MSG 0x01
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/* command list structure */
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typedef union {
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struct {
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u_int8_t Dev;
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u_int8_t Bus:6;
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u_int8_t Mode:2;
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} __packed PeripDev;
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struct {
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u_int8_t DevLSB;
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u_int8_t DevMSB:6;
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u_int8_t Mode:2;
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} __packed LogDev;
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struct {
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u_int8_t Dev:5;
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u_int8_t Bus:3;
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u_int8_t Targ:6;
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u_int8_t Mode:2;
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} __packed LogUnit;
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} SCSI3Addr_struct;
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typedef struct {
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u_int32_t TargetId:24;
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u_int32_t Bus:6;
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u_int32_t Mode:2;
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SCSI3Addr_struct Target[2];
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} __packed PhysDevAddr_struct;
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typedef struct {
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u_int32_t VolId:30;
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u_int32_t Mode:2;
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u_int8_t reserved[4];
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} __packed LogDevAddr_struct;
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typedef union {
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u_int8_t LunAddrBytes[8];
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SCSI3Addr_struct SCSI3Lun[4];
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PhysDevAddr_struct PhysDev;
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LogDevAddr_struct LogDev;
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} __packed LUNAddr_struct;
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typedef struct {
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u_int8_t CDBLen;
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struct {
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u_int8_t Type:3;
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u_int8_t Attribute:3;
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u_int8_t Direction:2;
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} __packed Type;
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u_int16_t Timeout;
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u_int8_t CDB[16];
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} __packed RequestBlock_struct;
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typedef union {
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struct {
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u_int8_t Reserved[3];
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u_int8_t Type;
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u_int32_t ErrorInfo;
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} __packed Common_Info;
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struct {
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u_int8_t Reserved[2];
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u_int8_t offense_size;
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u_int8_t offense_num;
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u_int32_t offense_value;
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} __packed Invalid_Cmd;
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} __packed MoreErrInfo_struct;
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typedef struct {
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u_int8_t ScsiStatus;
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u_int8_t SenseLen;
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u_int16_t CommandStatus;
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u_int32_t ResidualCnt;
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MoreErrInfo_struct MoreErrInfo;
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u_int8_t SenseInfo[SENSEINFOBYTES];
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} __packed ErrorInfo_struct;
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typedef struct {
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LUNAddr_struct LUN_info; /* 8 */
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RequestBlock_struct Request; /* 20 */
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ErrorInfo_struct error_info; /* 48 */
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u_int16_t buf_size; /* 2 */
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u_int8_t *buf; /* 4 */
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} __packed IOCTL_Command_struct;
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#ifdef __amd64__
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typedef struct {
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LUNAddr_struct LUN_info; /* 8 */
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RequestBlock_struct Request; /* 20 */
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ErrorInfo_struct error_info; /* 48 */
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u_int16_t buf_size; /* 2 */
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u_int32_t buf; /* 4 */
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} __packed IOCTL_Command_struct32;
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#endif
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/************************************************************************
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* Command queue statistics
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*/
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#define CISSQ_FREE 0
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#define CISSQ_NOTIFY 1
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#define CISSQ_COUNT 2
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struct ciss_qstat {
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uint32_t q_length;
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uint32_t q_max;
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};
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union ciss_statrequest {
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uint32_t cs_item;
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struct ciss_qstat cs_qstat;
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};
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/*
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* Note that we'd normally pass the struct in directly, but
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* this code is trying to be compatible with other drivers.
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*/
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#define CCISS_GETPCIINFO _IOR ('C', 200, cciss_pci_info_struct)
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#define CCISS_GETINTINFO _IOR ('C', 201, cciss_coalint_struct)
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#define CCISS_SETINTINFO _IOW ('C', 202, cciss_coalint_struct)
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#define CCISS_GETNODENAME _IOR ('C', 203, NodeName_type)
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#define CCISS_SETNODENAME _IOW ('C', 204, NodeName_type)
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#define CCISS_GETHEARTBEAT _IOR ('C', 205, Heartbeat_type)
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#define CCISS_GETBUSTYPES _IOR ('C', 206, BusTypes_type)
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#define CCISS_GETFIRMVER _IOR ('C', 207, FirmwareVer_type)
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#define CCISS_GETDRIVERVER _IOR ('C', 208, DriverVer_type)
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#define CCISS_REVALIDVOLS _IO ('C', 209)
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#define CCISS_PASSTHRU _IOWR ('C', 210, IOCTL_Command_struct)
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#ifdef __amd64
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#define CCISS_PASSTHRU32 _IOWR ('C', 210, IOCTL_Command_struct32)
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#endif
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#define CCISS_GETQSTATS _IOWR ('C', 211, union ciss_statrequest)
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#pragma pack()
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