/*
* Copyright (c) 2005-2018 Douglas Gilbert.
* All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the BSD_LICENSE file.
*/
/* sg_pt_linux version 1.37 20180126 */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/sysmacros.h> /* to define 'major' */
#ifndef major
#include <sys/types.h>
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <linux/major.h>
#include "sg_pt.h"
#include "sg_lib.h"
#include "sg_linux_inc.h"
#include "sg_pt_linux.h"
#ifdef major
#define SG_DEV_MAJOR major
#else
#ifdef HAVE_LINUX_KDEV_T_H
#include <linux/kdev_t.h>
#endif
#define SG_DEV_MAJOR MAJOR /* MAJOR() macro faulty if > 255 minors */
#endif
#ifndef BLOCK_EXT_MAJOR
#define BLOCK_EXT_MAJOR 259
#endif
#define DEF_TIMEOUT 60000 /* 60,000 millisecs (60 seconds) */
static const char * linux_host_bytes[] = {
"DID_OK", "DID_NO_CONNECT", "DID_BUS_BUSY", "DID_TIME_OUT",
"DID_BAD_TARGET", "DID_ABORT", "DID_PARITY", "DID_ERROR",
"DID_RESET", "DID_BAD_INTR", "DID_PASSTHROUGH", "DID_SOFT_ERROR",
"DID_IMM_RETRY", "DID_REQUEUE" /* 0xd */,
"DID_TRANSPORT_DISRUPTED", "DID_TRANSPORT_FAILFAST",
"DID_TARGET_FAILURE" /* 0x10 */,
"DID_NEXUS_FAILURE (reservation conflict)",
"DID_ALLOC_FAILURE",
"DID_MEDIUM_ERROR",
};
#define LINUX_HOST_BYTES_SZ \
(int)(sizeof(linux_host_bytes) / sizeof(linux_host_bytes[0]))
static const char * linux_driver_bytes[] = {
"DRIVER_OK", "DRIVER_BUSY", "DRIVER_SOFT", "DRIVER_MEDIA",
"DRIVER_ERROR", "DRIVER_INVALID", "DRIVER_TIMEOUT", "DRIVER_HARD",
"DRIVER_SENSE"
};
#define LINUX_DRIVER_BYTES_SZ \
(int)(sizeof(linux_driver_bytes) / sizeof(linux_driver_bytes[0]))
#if 0
static const char * linux_driver_suggests[] = {
"SUGGEST_OK", "SUGGEST_RETRY", "SUGGEST_ABORT", "SUGGEST_REMAP",
"SUGGEST_DIE", "UNKNOWN","UNKNOWN","UNKNOWN",
"SUGGEST_SENSE"
};
#define LINUX_DRIVER_SUGGESTS_SZ \
(int)(sizeof(linux_driver_suggests) / sizeof(linux_driver_suggests[0]))
#endif
/*
* These defines are for constants that should be visible in the
* /usr/include/scsi directory (brought in by sg_linux_inc.h).
* Redefined and aliased here to decouple this code from
* sg_io_linux.h N.B. the SUGGEST_* constants are no longer used.
*/
#ifndef DRIVER_MASK
#define DRIVER_MASK 0x0f
#endif
#ifndef SUGGEST_MASK
#define SUGGEST_MASK 0xf0
#endif
#ifndef DRIVER_SENSE
#define DRIVER_SENSE 0x08
#endif
#define SG_LIB_DRIVER_MASK DRIVER_MASK
#define SG_LIB_SUGGEST_MASK SUGGEST_MASK
#define SG_LIB_DRIVER_SENSE DRIVER_SENSE
bool sg_bsg_nvme_char_major_checked = false;
int sg_bsg_major = 0;
volatile int sg_nvme_char_major = 0;
long sg_lin_page_size = 4096; /* default, overridden with correct value */
#if defined(__GNUC__) || defined(__clang__)
static int pr2ws(const char * fmt, ...)
__attribute__ ((format (printf, 1, 2)));
#else
static int pr2ws(const char * fmt, ...);
#endif
static int
pr2ws(const char * fmt, ...)
{
va_list args;
int n;
va_start(args, fmt);
n = vfprintf(sg_warnings_strm ? sg_warnings_strm : stderr, fmt, args);
va_end(args);
return n;
}
/* This function only needs to be called once (unless a NVMe controller
* can be hot-plugged into system in which case it should be called
* (again) after that event). */
void
sg_find_bsg_nvme_char_major(int verbose)
{
bool got_one = false;
int n;
const char * proc_devices = "/proc/devices";
char * cp;
FILE *fp;
char a[128];
char b[128];
sg_lin_page_size = sysconf(_SC_PAGESIZE);
if (NULL == (fp = fopen(proc_devices, "r"))) {
if (verbose)
pr2ws("fopen %s failed: %s\n", proc_devices, strerror(errno));
return;
}
while ((cp = fgets(b, sizeof(b), fp))) {
if ((1 == sscanf(b, "%126s", a)) &&
(0 == memcmp(a, "Character", 9)))
break;
}
while (cp && (cp = fgets(b, sizeof(b), fp))) {
if (2 == sscanf(b, "%d %126s", &n, a)) {
if (0 == strcmp("bsg", a)) {
sg_bsg_major = n;
if (got_one)
break;
got_one = true;
} else if (0 == strcmp("nvme", a)) {
sg_nvme_char_major = n;
if (got_one)
break;
got_one = true;
}
} else
break;
}
if (verbose > 3) {
if (cp) {
if (sg_bsg_major > 0)
pr2ws("found sg_bsg_major=%d\n", sg_bsg_major);
if (sg_nvme_char_major > 0)
pr2ws("found sg_nvme_char_major=%d\n", sg_nvme_char_major);
} else
pr2ws("found no bsg not nvme char device in %s\n", proc_devices);
}
fclose(fp);
}
/* Assumes that sg_find_bsg_nvme_char_major() has already been called. Returns
* true if dev_fd is a scsi generic pass-through device. If yields
* *is_nvme_p = true with *nsid_p = 0 then dev_fd is a NVMe char device.
* If yields *nsid_p > 0 then dev_fd is a NVMe block device. */
static bool
check_file_type(int dev_fd, struct stat * dev_statp, bool * is_bsg_p,
bool * is_nvme_p, uint32_t * nsid_p, int * os_err_p,
int verbose)
{
bool is_nvme = false;
bool is_sg = false;
bool is_bsg = false;
bool is_block = false;
int os_err = 0;
int major_num;
uint32_t nsid = 0; /* invalid NSID */
if (dev_fd >= 0) {
if (fstat(dev_fd, dev_statp) < 0) {
os_err = errno;
if (verbose)
pr2ws("%s: fstat() failed: %s (errno=%d)\n", __func__,
safe_strerror(os_err), os_err);
goto skip_out;
}
major_num = (int)SG_DEV_MAJOR(dev_statp->st_rdev);
if (S_ISCHR(dev_statp->st_mode)) {
if (SCSI_GENERIC_MAJOR == major_num)
is_sg = true;
else if (sg_bsg_major == major_num)
is_bsg = true;
else if (sg_nvme_char_major == major_num)
is_nvme = true;
} else if (S_ISBLK(dev_statp->st_mode)) {
is_block = true;
if (BLOCK_EXT_MAJOR == major_num) {
is_nvme = true;
nsid = ioctl(dev_fd, NVME_IOCTL_ID, NULL);
if (SG_NVME_BROADCAST_NSID == nsid) { /* means ioctl error */
os_err = errno;
if (verbose)
pr2ws("%s: ioctl(NVME_IOCTL_ID) failed: %s "
"(errno=%d)\n", __func__, safe_strerror(os_err),
os_err);
} else
os_err = 0;
}
}
} else {
os_err = EBADF;
if (verbose)
pr2ws("%s: invalid file descriptor (%d)\n", __func__, dev_fd);
}
skip_out:
if (verbose > 3) {
pr2ws("%s: file descriptor is ", __func__);
if (is_sg)
pr2ws("sg device\n");
else if (is_bsg)
pr2ws("bsg device\n");
else if (is_nvme && (0 == nsid))
pr2ws("NVMe char device\n");
else if (is_nvme)
pr2ws("NVMe block device, nsid=%lld\n",
((uint32_t)-1 == nsid) ? -1LL : (long long)nsid);
else if (is_block)
pr2ws("block device\n");
else
pr2ws("undetermined device, could be regular file\n");
}
if (is_bsg_p)
*is_bsg_p = is_bsg;
if (is_nvme_p)
*is_nvme_p = is_nvme;
if (nsid_p)
*nsid_p = nsid;
if (os_err_p)
*os_err_p = os_err;
return is_sg;
}
/* Assumes dev_fd is an "open" file handle associated with device_name. If
* the implementation (possibly for one OS) cannot determine from dev_fd if
* a SCSI or NVMe pass-through is referenced, then it might guess based on
* device_name. Returns 1 if SCSI generic pass-though device, returns 2 if
* secondary SCSI pass-through device (in Linux a bsg device); returns 3 is
* char NVMe device (i.e. no NSID); returns 4 if block NVMe device (includes
* NSID), or 0 if something else (e.g. ATA block device) or dev_fd < 0.
* If error, returns negated errno (operating system) value. */
int
check_pt_file_handle(int dev_fd, const char * device_name, int verbose)
{
if (verbose > 4)
pr2ws("%s: dev_fd=%d, device_name: %s\n", __func__, dev_fd,
device_name);
/* Linux doesn't need device_name to determine which pass-through */
if (! sg_bsg_nvme_char_major_checked) {
sg_bsg_nvme_char_major_checked = true;
sg_find_bsg_nvme_char_major(verbose);
}
if (dev_fd >= 0) {
bool is_sg, is_bsg, is_nvme;
int err;
uint32_t nsid;
struct stat a_stat;
is_sg = check_file_type(dev_fd, &a_stat, &is_bsg, &is_nvme, &nsid,
&err, verbose);
if (err)
return -err;
else if (is_sg)
return 1;
else if (is_bsg)
return 2;
else if (is_nvme && (0 == nsid))
return 3;
else if (is_nvme)
return 4;
else
return 0;
} else
return 0;
}
/*
* We make a runtime decision whether to use the sg v3 interface or the sg
* v4 interface (currently exclusively used by the bsg driver). If all the
* following are true we use sg v4 which is only currently supported on bsg
* device nodes:
* a) there is a bsg entry in the /proc/devices file
* b) the device node given to scsi_pt_open() is a char device
* c) the char major number of the device node given to scsi_pt_open()
* matches the char major number of the bsg entry in /proc/devices
* Otherwise the sg v3 interface is used.
*
* Note that in either case we prepare the data in a sg v4 structure. If
* the runtime tests indicate that the v3 interface is needed then
* do_scsi_pt_v3() transfers the input data into a v3 structure and
* then the output data is transferred back into a sg v4 structure.
* That implementation detail could change in the future.
*
* [20120806] Only use MAJOR() macro in kdev_t.h if that header file is
* available and major() macro [N.B. lower case] is not available.
*/
#ifdef major
#define SG_DEV_MAJOR major
#else
#ifdef HAVE_LINUX_KDEV_T_H
#include <linux/kdev_t.h>
#endif
#define SG_DEV_MAJOR MAJOR /* MAJOR() macro faulty if > 255 minors */
#endif
/* Returns >= 0 if successful. If error in Unix returns negated errno. */
int
scsi_pt_open_device(const char * device_name, bool read_only, int verbose)
{
int oflags = O_NONBLOCK;
oflags |= (read_only ? O_RDONLY : O_RDWR);
return scsi_pt_open_flags(device_name, oflags, verbose);
}
/* Similar to scsi_pt_open_device() but takes Unix style open flags OR-ed */
/* together. The 'flags' argument is advisory and may be ignored. */
/* Returns >= 0 if successful, otherwise returns negated errno. */
int
scsi_pt_open_flags(const char * device_name, int flags, int verbose)
{
int fd;
if (! sg_bsg_nvme_char_major_checked) {
sg_bsg_nvme_char_major_checked = true;
sg_find_bsg_nvme_char_major(verbose);
}
if (verbose > 1) {
pr2ws("open %s with flags=0x%x\n", device_name, flags);
}
fd = open(device_name, flags);
if (fd < 0) {
fd = -errno;
if (verbose > 1)
pr2ws("%s: open(%s, 0x%x) failed: %s\n", __func__, device_name,
flags, safe_strerror(-fd));
}
return fd;
}
/* Returns 0 if successful. If error in Unix returns negated errno. */
int
scsi_pt_close_device(int device_fd)
{
int res;
res = close(device_fd);
if (res < 0)
res = -errno;
return res;
}
/* Caller should additionally call get_scsi_pt_os_err() after this call */
struct sg_pt_base *
construct_scsi_pt_obj_with_fd(int dev_fd, int verbose)
{
int err;
struct sg_pt_linux_scsi * ptp;
/* The following 2 lines are temporary. It is to avoid a NULL pointer
* crash when an old utility is used with a newer library built after
* the sg_warnings_strm cleanup */
if (NULL == sg_warnings_strm)
sg_warnings_strm = stderr;
ptp = (struct sg_pt_linux_scsi *)
calloc(1, sizeof(struct sg_pt_linux_scsi));
if (ptp) {
err = set_pt_file_handle((struct sg_pt_base *)ptp, dev_fd, verbose);
if ((0 == err) && (! ptp->is_nvme)) {
ptp->io_hdr.guard = 'Q';
#ifdef BSG_PROTOCOL_SCSI
ptp->io_hdr.protocol = BSG_PROTOCOL_SCSI;
#endif
#ifdef BSG_SUB_PROTOCOL_SCSI_CMD
ptp->io_hdr.subprotocol = BSG_SUB_PROTOCOL_SCSI_CMD;
#endif
}
} else if (verbose)
pr2ws("%s: calloc() failed, out of memory?\n", __func__);
return (struct sg_pt_base *)ptp;
}
struct sg_pt_base *
construct_scsi_pt_obj()
{
return construct_scsi_pt_obj_with_fd(-1 /* dev_fd */, 0 /* verbose */);
}
void
destruct_scsi_pt_obj(struct sg_pt_base * vp)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
if (ptp->free_nvme_id_ctlp) {
free(ptp->free_nvme_id_ctlp);
ptp->free_nvme_id_ctlp = NULL;
ptp->nvme_id_ctlp = NULL;
}
if (ptp)
free(ptp);
}
/* Remembers previous device file descriptor */
void
clear_scsi_pt_obj(struct sg_pt_base * vp)
{
bool is_sg, is_bsg, is_nvme;
int fd;
uint32_t nvme_nsid;
struct sg_pt_linux_scsi * ptp = &vp->impl;
if (ptp) {
fd = ptp->dev_fd;
is_sg = ptp->is_sg;
is_bsg = ptp->is_bsg;
is_nvme = ptp->is_nvme;
nvme_nsid = ptp->nvme_nsid;
memset(ptp, 0, sizeof(struct sg_pt_linux_scsi));
ptp->io_hdr.guard = 'Q';
#ifdef BSG_PROTOCOL_SCSI
ptp->io_hdr.protocol = BSG_PROTOCOL_SCSI;
#endif
#ifdef BSG_SUB_PROTOCOL_SCSI_CMD
ptp->io_hdr.subprotocol = BSG_SUB_PROTOCOL_SCSI_CMD;
#endif
ptp->dev_fd = fd;
ptp->is_sg = is_sg;
ptp->is_bsg = is_bsg;
ptp->is_nvme = is_nvme;
ptp->nvme_direct = false;
ptp->nvme_nsid = nvme_nsid;
}
}
/* Forget any previous dev_fd and install the one given. May attempt to
* find file type (e.g. if pass-though) from OS so there could be an error.
* Returns 0 for success or the same value as get_scsi_pt_os_err()
* will return. dev_fd should be >= 0 for a valid file handle or -1 . */
int
set_pt_file_handle(struct sg_pt_base * vp, int dev_fd, int verbose)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
struct stat a_stat;
if (! sg_bsg_nvme_char_major_checked) {
sg_bsg_nvme_char_major_checked = true;
sg_find_bsg_nvme_char_major(verbose);
}
ptp->dev_fd = dev_fd;
if (dev_fd >= 0)
ptp->is_sg = check_file_type(dev_fd, &a_stat, &ptp->is_bsg,
&ptp->is_nvme, &ptp->nvme_nsid,
&ptp->os_err, verbose);
else {
ptp->is_sg = false;
ptp->is_bsg = false;
ptp->is_nvme = false;
ptp->nvme_direct = false;
ptp->nvme_nsid = 0;
ptp->os_err = 0;
}
return ptp->os_err;
}
/* Valid file handles (which is the return value) are >= 0 . Returns -1
* if there is no valid file handle. */
int
get_pt_file_handle(const struct sg_pt_base * vp)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
return ptp->dev_fd;
}
void
set_scsi_pt_cdb(struct sg_pt_base * vp, const unsigned char * cdb,
int cdb_len)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
if (ptp->io_hdr.request)
++ptp->in_err;
ptp->io_hdr.request = (__u64)(sg_uintptr_t)cdb;
ptp->io_hdr.request_len = cdb_len;
}
void
set_scsi_pt_sense(struct sg_pt_base * vp, unsigned char * sense,
int max_sense_len)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
if (ptp->io_hdr.response)
++ptp->in_err;
memset(sense, 0, max_sense_len);
ptp->io_hdr.response = (__u64)(sg_uintptr_t)sense;
ptp->io_hdr.max_response_len = max_sense_len;
}
/* Setup for data transfer from device */
void
set_scsi_pt_data_in(struct sg_pt_base * vp, unsigned char * dxferp,
int dxfer_ilen)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
if (ptp->io_hdr.din_xferp)
++ptp->in_err;
if (dxfer_ilen > 0) {
ptp->io_hdr.din_xferp = (__u64)(sg_uintptr_t)dxferp;
ptp->io_hdr.din_xfer_len = dxfer_ilen;
}
}
/* Setup for data transfer toward device */
void
set_scsi_pt_data_out(struct sg_pt_base * vp, const unsigned char * dxferp,
int dxfer_olen)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
if (ptp->io_hdr.dout_xferp)
++ptp->in_err;
if (dxfer_olen > 0) {
ptp->io_hdr.dout_xferp = (__u64)(sg_uintptr_t)dxferp;
ptp->io_hdr.dout_xfer_len = dxfer_olen;
}
}
void
set_pt_metadata_xfer(struct sg_pt_base * vp, unsigned char * dxferp,
uint32_t dxfer_len, bool out_true)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
if (dxfer_len > 0) {
ptp->mdxferp = dxferp;
ptp->mdxfer_len = dxfer_len;
ptp->mdxfer_out = out_true;
}
}
void
set_scsi_pt_packet_id(struct sg_pt_base * vp, int pack_id)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
ptp->io_hdr.spare_in = pack_id;
}
void
set_scsi_pt_tag(struct sg_pt_base * vp, uint64_t tag)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
ptp->io_hdr.request_tag = tag;
}
/* Note that task management function codes are transport specific */
void
set_scsi_pt_task_management(struct sg_pt_base * vp, int tmf_code)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
ptp->io_hdr.subprotocol = 1; /* SCSI task management function */
ptp->tmf_request[0] = (unsigned char)tmf_code; /* assume it fits */
ptp->io_hdr.request = (__u64)(sg_uintptr_t)(&(ptp->tmf_request[0]));
ptp->io_hdr.request_len = 1;
}
void
set_scsi_pt_task_attr(struct sg_pt_base * vp, int attribute, int priority)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
ptp->io_hdr.request_attr = attribute;
ptp->io_hdr.request_priority = priority;
}
#ifndef BSG_FLAG_Q_AT_TAIL
#define BSG_FLAG_Q_AT_TAIL 0x10
#endif
#ifndef BSG_FLAG_Q_AT_HEAD
#define BSG_FLAG_Q_AT_HEAD 0x20
#endif
/* Need this later if translated to v3 interface */
#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
void
set_scsi_pt_flags(struct sg_pt_base * vp, int flags)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
/* default action of bsg driver (sg v4) is QUEUE_AT_HEAD */
/* default action of block layer SG_IO ioctl is QUEUE_AT_TAIL */
if (SCSI_PT_FLAGS_QUEUE_AT_HEAD & flags) { /* favour AT_HEAD */
ptp->io_hdr.flags |= BSG_FLAG_Q_AT_HEAD;
ptp->io_hdr.flags &= ~BSG_FLAG_Q_AT_TAIL;
} else if (SCSI_PT_FLAGS_QUEUE_AT_TAIL & flags) {
ptp->io_hdr.flags |= BSG_FLAG_Q_AT_TAIL;
ptp->io_hdr.flags &= ~BSG_FLAG_Q_AT_HEAD;
}
}
/* N.B. Returns din_resid and ignores dout_resid */
int
get_scsi_pt_resid(const struct sg_pt_base * vp)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
if (NULL == ptp)
return 0;
return ptp->nvme_direct ? 0 : ptp->io_hdr.din_resid;
}
int
get_scsi_pt_status_response(const struct sg_pt_base * vp)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
if (NULL == ptp)
return 0;
return (int)(ptp->nvme_direct ? ptp->nvme_status :
ptp->io_hdr.device_status);
}
uint32_t
get_pt_result(const struct sg_pt_base * vp)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
if (NULL == ptp)
return 0;
return ptp->nvme_direct ? ptp->nvme_result :
ptp->io_hdr.device_status;
}
int
get_scsi_pt_sense_len(const struct sg_pt_base * vp)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
return ptp->io_hdr.response_len;
}
int
get_scsi_pt_duration_ms(const struct sg_pt_base * vp)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
return ptp->io_hdr.duration;
}
int
get_scsi_pt_transport_err(const struct sg_pt_base * vp)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
return ptp->io_hdr.transport_status;
}
void
set_scsi_pt_transport_err(struct sg_pt_base * vp, int err)
{
struct sg_pt_linux_scsi * ptp = &vp->impl;
ptp->io_hdr.transport_status = err;
}
/* Returns b which will contain a null char terminated string (if
* max_b_len > 0). Combined driver and transport (called "host" in Linux
* kernel) statuses */
char *
get_scsi_pt_transport_err_str(const struct sg_pt_base * vp, int max_b_len,
char * b)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
int ds = ptp->io_hdr.driver_status;
int hs = ptp->io_hdr.transport_status;
int n, m;
char * cp = b;
int driv;
const char * driv_cp = "invalid";
if (max_b_len < 1)
return b;
m = max_b_len;
n = 0;
if (hs) {
if ((hs < 0) || (hs >= LINUX_HOST_BYTES_SZ))
n = snprintf(cp, m, "Host_status=0x%02x is invalid\n", hs);
else
n = snprintf(cp, m, "Host_status=0x%02x [%s]\n", hs,
linux_host_bytes[hs]);
}
m -= n;
if (m < 1) {
b[max_b_len - 1] = '\0';
return b;
}
cp += n;
driv = ds & SG_LIB_DRIVER_MASK;
if (driv < LINUX_DRIVER_BYTES_SZ)
driv_cp = linux_driver_bytes[driv];
#if 0
sugg = (ds & SG_LIB_SUGGEST_MASK) >> 4;
if (sugg < LINUX_DRIVER_SUGGESTS_SZ)
sugg_cp = linux_driver_suggests[sugg];
#endif
n = snprintf(cp, m, "Driver_status=0x%02x [%s]\n", ds, driv_cp);
m -= n;
if (m < 1)
b[max_b_len - 1] = '\0';
return b;
}
int
get_scsi_pt_result_category(const struct sg_pt_base * vp)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
int dr_st = ptp->io_hdr.driver_status & SG_LIB_DRIVER_MASK;
int scsi_st = ptp->io_hdr.device_status & 0x7e;
if (ptp->os_err)
return SCSI_PT_RESULT_OS_ERR;
else if (ptp->io_hdr.transport_status)
return SCSI_PT_RESULT_TRANSPORT_ERR;
else if (dr_st && (SG_LIB_DRIVER_SENSE != dr_st))
return SCSI_PT_RESULT_TRANSPORT_ERR;
else if ((SG_LIB_DRIVER_SENSE == dr_st) ||
(SAM_STAT_CHECK_CONDITION == scsi_st) ||
(SAM_STAT_COMMAND_TERMINATED == scsi_st))
return SCSI_PT_RESULT_SENSE;
else if (scsi_st)
return SCSI_PT_RESULT_STATUS;
else
return SCSI_PT_RESULT_GOOD;
}
int
get_scsi_pt_os_err(const struct sg_pt_base * vp)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
return ptp->os_err;
}
char *
get_scsi_pt_os_err_str(const struct sg_pt_base * vp, int max_b_len, char * b)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
const char * cp;
cp = safe_strerror(ptp->os_err);
strncpy(b, cp, max_b_len);
if ((int)strlen(cp) >= max_b_len)
b[max_b_len - 1] = '\0';
return b;
}
bool
pt_device_is_nvme(const struct sg_pt_base * vp)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
return ptp->is_nvme;
}
/* If a NVMe block device (which includes the NSID) handle is associated
* with 'vp', then its NSID is returned (values range from 0x1 to
* 0xffffffe). Otherwise 0 is returned. */
uint32_t
get_pt_nvme_nsid(const struct sg_pt_base * vp)
{
const struct sg_pt_linux_scsi * ptp = &vp->impl;
return ptp->nvme_nsid;
}
/* Executes SCSI command using sg v3 interface */
static int
do_scsi_pt_v3(struct sg_pt_linux_scsi * ptp, int fd, int time_secs,
int verbose)
{
struct sg_io_hdr v3_hdr;
memset(&v3_hdr, 0, sizeof(v3_hdr));
/* convert v4 to v3 header */
v3_hdr.interface_id = 'S';
v3_hdr.dxfer_direction = SG_DXFER_NONE;
v3_hdr.cmdp = (unsigned char *)(long)ptp->io_hdr.request;
v3_hdr.cmd_len = (unsigned char)ptp->io_hdr.request_len;
if (ptp->io_hdr.din_xfer_len > 0) {
if (ptp->io_hdr.dout_xfer_len > 0) {
if (verbose)
pr2ws("sgv3 doesn't support bidi\n");
return SCSI_PT_DO_BAD_PARAMS;
}
v3_hdr.dxferp = (void *)(long)ptp->io_hdr.din_xferp;
v3_hdr.dxfer_len = (unsigned int)ptp->io_hdr.din_xfer_len;
v3_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
} else if (ptp->io_hdr.dout_xfer_len > 0) {
v3_hdr.dxferp = (void *)(long)ptp->io_hdr.dout_xferp;
v3_hdr.dxfer_len = (unsigned int)ptp->io_hdr.dout_xfer_len;
v3_hdr.dxfer_direction = SG_DXFER_TO_DEV;
}
if (ptp->io_hdr.response && (ptp->io_hdr.max_response_len > 0)) {
v3_hdr.sbp = (unsigned char *)(long)ptp->io_hdr.response;
v3_hdr.mx_sb_len = (unsigned char)ptp->io_hdr.max_response_len;
}
v3_hdr.pack_id = (int)ptp->io_hdr.spare_in;
if (BSG_FLAG_Q_AT_HEAD & ptp->io_hdr.flags)
v3_hdr.flags |= SG_FLAG_Q_AT_HEAD; /* favour AT_HEAD */
else if (BSG_FLAG_Q_AT_TAIL & ptp->io_hdr.flags)
v3_hdr.flags |= SG_FLAG_Q_AT_TAIL;
if (NULL == v3_hdr.cmdp) {
if (verbose)
pr2ws("No SCSI command (cdb) given\n");
return SCSI_PT_DO_BAD_PARAMS;
}
/* io_hdr.timeout is in milliseconds, if greater than zero */
v3_hdr.timeout = ((time_secs > 0) ? (time_secs * 1000) : DEF_TIMEOUT);
/* Finally do the v3 SG_IO ioctl */
if (ioctl(fd, SG_IO, &v3_hdr) < 0) {
ptp->os_err = errno;
if (verbose > 1)
pr2ws("ioctl(SG_IO v3) failed: %s (errno=%d)\n",
safe_strerror(ptp->os_err), ptp->os_err);
return -ptp->os_err;
}
ptp->io_hdr.device_status = (__u32)v3_hdr.status;
ptp->io_hdr.driver_status = (__u32)v3_hdr.driver_status;
ptp->io_hdr.transport_status = (__u32)v3_hdr.host_status;
ptp->io_hdr.response_len = (__u32)v3_hdr.sb_len_wr;
ptp->io_hdr.duration = (__u32)v3_hdr.duration;
ptp->io_hdr.din_resid = (__s32)v3_hdr.resid;
/* v3_hdr.info not passed back since no mapping defined (yet) */
return 0;
}
/* Executes SCSI command (or at least forwards it to lower layers).
* Returns 0 for success, negative numbers are negated 'errno' values from
* OS system calls. Positive return values are errors from this package. */
int
do_scsi_pt(struct sg_pt_base * vp, int fd, int time_secs, int verbose)
{
int err;
struct sg_pt_linux_scsi * ptp = &vp->impl;
bool have_checked_for_type = (ptp->dev_fd >= 0);
if (! sg_bsg_nvme_char_major_checked) {
sg_bsg_nvme_char_major_checked = true;
sg_find_bsg_nvme_char_major(verbose);
}
if (ptp->in_err) {
if (verbose)
pr2ws("Replicated or unused set_scsi_pt... functions\n");
return SCSI_PT_DO_BAD_PARAMS;
}
if (fd >= 0) {
if ((ptp->dev_fd >= 0) && (fd != ptp->dev_fd)) {
if (verbose)
pr2ws("%s: file descriptor given to create() and here "
"differ\n", __func__);
return SCSI_PT_DO_BAD_PARAMS;
}
ptp->dev_fd = fd;
} else if (ptp->dev_fd < 0) {
if (verbose)
pr2ws("%s: invalid file descriptors\n", __func__);
return SCSI_PT_DO_BAD_PARAMS;
} else
fd = ptp->dev_fd;
if (! have_checked_for_type) {
err = set_pt_file_handle(vp, ptp->dev_fd, verbose);
if (err)
return -ptp->os_err;
}
if (ptp->os_err)
return -ptp->os_err;
if (ptp->is_nvme)
return sg_do_nvme_pt(vp, -1, time_secs, verbose);
else if (sg_bsg_major <= 0)
return do_scsi_pt_v3(ptp, fd, time_secs, verbose);
else if (ptp->is_bsg)
; /* drop through to sg v4 implementation */
else
return do_scsi_pt_v3(ptp, fd, time_secs, verbose);
if (! ptp->io_hdr.request) {
if (verbose)
pr2ws("No SCSI command (cdb) given (v4)\n");
return SCSI_PT_DO_BAD_PARAMS;
}
/* io_hdr.timeout is in milliseconds */
ptp->io_hdr.timeout = ((time_secs > 0) ? (time_secs * 1000) :
DEF_TIMEOUT);
#if 0
/* sense buffer already zeroed */
if (ptp->io_hdr.response && (ptp->io_hdr.max_response_len > 0)) {
void * p;
p = (void *)(long)ptp->io_hdr.response;
memset(p, 0, ptp->io_hdr.max_response_len);
}
#endif
if (ioctl(fd, SG_IO, &ptp->io_hdr) < 0) {
ptp->os_err = errno;
if (verbose > 1)
pr2ws("ioctl(SG_IO v4) failed: %s (errno=%d)\n",
safe_strerror(ptp->os_err), ptp->os_err);
return -ptp->os_err;
}
return 0;
}