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/*
* Copyright (C) 2010-2019 D. Gilbert
* 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, or (at your option)
* any later version.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
*
* This program was used to test SCSI mid level queue ordering.
* The default behaviour is to "queue at head" which is useful for
* error processing but not for streaming READ and WRITE commands.
*
* Invocation: sg_queue_tst [-l=Q_LEN] [-t] <sg_device>
* -t queue at tail
*
* Version 0.96 (20190128)
*/
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef HAVE_LINUX_SG_V4_HDR
/* Kernel uapi header contain __user decorations on user space pointers
* to indicate they are unsafe in the kernel space. However glibc takes
* all those __user decorations out from headers in /usr/include/linux .
* So to stop compile errors when directly importing include/uapi/scsi/sg.h
* undef __user before doing that include. */
#define __user
/* Want to block the original sg.h header from also being included. That
* causes lots of multiple definition errors. This will only work if this
* header is included _before_ the original sg.h header. */
#define _SCSI_GENERIC_H /* original kernel header guard */
#define _SCSI_SG_H /* glibc header guard */
#include "uapi_sg.h" /* local copy of include/uapi/scsi/sg.h */
#else
#define __user
#endif /* end of: ifndef HAVE_LINUX_SG_V4_HDR */
#include "sg_lib.h"
#include "sg_io_linux.h"
#include "sg_linux_inc.h"
#define INQ_REPLY_LEN 96
#define INQ_CMD_LEN 6
#define SDIAG_CMD_LEN 6
#define SENSE_BUFFER_LEN 96
#define EBUFF_SZ 256
#ifndef SG_FLAG_Q_AT_TAIL
#define SG_FLAG_Q_AT_TAIL 0x10
#endif
#ifndef SG_FLAG_Q_AT_HEAD
#define SG_FLAG_Q_AT_HEAD 0x20
#endif
#define DEF_Q_LEN 16 /* max in sg v3 and earlier */
#define MAX_Q_LEN 256
static void
set_nanosecs(int sg_fd)
{
struct sg_extended_info sei;
struct sg_extended_info * seip;
seip = &sei;
memset(seip, 0, sizeof(*seip));
seip->sei_wr_mask |= SG_SEIM_CTL_FLAGS;
seip->sei_rd_mask |= SG_SEIM_CTL_FLAGS; /* this or previous optional */
seip->ctl_flags_wr_mask |= SG_CTL_FLAGM_TIME_IN_NS;
seip->ctl_flags |= SG_CTL_FLAGM_TIME_IN_NS;
if (ioctl(sg_fd, SG_SET_GET_EXTENDED, seip) < 0) {
fprintf(stderr, "ioctl(SG_SET_GET_EXTENDED) failed, errno=%d %s\n",
errno, strerror(errno));
}
}
int main(int argc, char * argv[])
{
bool q_at_tail = false;
bool dur_in_nanosecs = false;
int sg_fd, k, ok;
uint8_t inq_cdb[INQ_CMD_LEN] =
{0x12, 0, 0, 0, INQ_REPLY_LEN, 0};
uint8_t sdiag_cdb[SDIAG_CMD_LEN] =
{0x1d, 0x10 /* PF */, 0, 0, 0, 0};
uint8_t inqBuff[MAX_Q_LEN][INQ_REPLY_LEN];
sg_io_hdr_t io_hdr[MAX_Q_LEN];
sg_io_hdr_t rio_hdr;
char * file_name = 0;
char ebuff[EBUFF_SZ];
uint8_t sense_buffer[MAX_Q_LEN][SENSE_BUFFER_LEN] SG_C_CPP_ZERO_INIT;
int q_len = DEF_Q_LEN;
for (k = 1; k < argc; ++k) {
if (0 == memcmp("-n", argv[k], 2))
dur_in_nanosecs = true;
else if (0 == memcmp("-t", argv[k], 2))
q_at_tail = true;
else if (0 == memcmp("-l=", argv[k], 3)) {
q_len = atoi(argv[k] + 3);
if ((q_len > 511) || (q_len < 1)) {
printf("Expect -l= to take a number (q length) between 1 "
"and 511\n");
file_name = 0;
break;
}
} else if (*argv[k] == '-') {
printf("Unrecognized switch: %s\n", argv[k]);
file_name = 0;
break;
}
else if (0 == file_name)
file_name = argv[k];
else {
printf("too many arguments\n");
file_name = 0;
break;
}
}
if (0 == file_name) {
printf("Usage: 'sg_queue_tst [-l=Q_LEN] [-n] [-t] <sg_device>'\n"
"where:\n"
" -l=Q_LEN queue length, between 1 and 511 "
"(def: 16)\n"
" -n duration in nanosecs (def: milliseconds)\n"
" -t queue_at_tail (def: q_at_head)\n");
return 1;
}
/* An access mode of O_RDWR is required for write()/read() interface */
if ((sg_fd = open(file_name, O_RDWR)) < 0) {
snprintf(ebuff, EBUFF_SZ,
"sg_queue_tst: error opening file: %s", file_name);
perror(ebuff);
return 1;
}
if (dur_in_nanosecs)
set_nanosecs(sg_fd);
for (k = 0; k < q_len; ++k) {
/* Prepare INQUIRY command */
memset(&io_hdr[k], 0, sizeof(sg_io_hdr_t));
io_hdr[k].interface_id = 'S';
/* io_hdr[k].iovec_count = 0; */ /* memset takes care of this */
io_hdr[k].mx_sb_len = (uint8_t)sizeof(sense_buffer);
if (0 == (k % 3)) {
io_hdr[k].cmd_len = sizeof(sdiag_cdb);
io_hdr[k].cmdp = sdiag_cdb;
io_hdr[k].dxfer_direction = SG_DXFER_NONE;
} else {
io_hdr[k].cmd_len = sizeof(inq_cdb);
io_hdr[k].cmdp = inq_cdb;
io_hdr[k].dxfer_direction = SG_DXFER_FROM_DEV;
io_hdr[k].dxfer_len = INQ_REPLY_LEN;
io_hdr[k].dxferp = inqBuff[k];
}
io_hdr[k].sbp = sense_buffer[k];
io_hdr[k].mx_sb_len = SENSE_BUFFER_LEN;
io_hdr[k].timeout = 20000; /* 20000 millisecs == 20 seconds */
io_hdr[k].pack_id = k;
/* default is to queue at head (in SCSI mid level) */
if (q_at_tail)
io_hdr[k].flags |= SG_FLAG_Q_AT_TAIL;
else
io_hdr[k].flags |= SG_FLAG_Q_AT_HEAD;
/* io_hdr[k].usr_ptr = NULL; */
if (write(sg_fd, &io_hdr[k], sizeof(sg_io_hdr_t)) < 0) {
perror("sg_queue_tst: sg write error");
close(sg_fd);
return 1;
}
}
/* sleep(3); */
for (k = 0; k < q_len; ++k) {
memset(&rio_hdr, 0, sizeof(sg_io_hdr_t));
rio_hdr.interface_id = 'S';
if (read(sg_fd, &rio_hdr, sizeof(sg_io_hdr_t)) < 0) {
perror("sg_queue_tst: sg read error");
close(sg_fd);
return 1;
}
/* now for the error processing */
ok = 0;
switch (sg_err_category3(&rio_hdr)) {
case SG_LIB_CAT_CLEAN:
ok = 1;
break;
case SG_LIB_CAT_RECOVERED:
printf("Recovered error, continuing\n");
ok = 1;
break;
default: /* won't bother decoding other categories */
sg_chk_n_print3("command error", &rio_hdr, 1);
break;
}
if (ok) { /* output result if it is available */
/* if (0 == rio_hdr.pack_id) */
if (0 == (rio_hdr.pack_id % 3))
printf("SEND DIAGNOSTIC %d duration=%u %s\n", rio_hdr.pack_id,
rio_hdr.duration, (dur_in_nanosecs ? "ns" : "ms"));
else
printf("INQUIRY %d duration=%u %s\n", rio_hdr.pack_id,
rio_hdr.duration, (dur_in_nanosecs ? "ns" : "ms"));
}
}
close(sg_fd);
return 0;
}
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