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systemd/extras/scsi_id/scsi_serial.c
Kay Sievers 1c8dc990dc scsi_id: add rand() in retry loop
2010-04-07 09:22:30 +02:00

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
*
* scsi_serial.c
*
* Code related to requesting and getting an id from a scsi device
*
* Copyright (C) IBM Corp. 2003
*
* Author:
* Patrick Mansfield<patmans@us.ibm.com>
*
* 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 version 2 of the License.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <time.h>
#include <inttypes.h>
#include <scsi/scsi.h>
#include <scsi/sg.h>
#include <linux/types.h>
#include <linux/bsg.h>
#include "libudev.h"
#include "libudev-private.h"
#include "scsi.h"
#include "scsi_id.h"
/*
* A priority based list of id, naa, and binary/ascii for the identifier
* descriptor in VPD page 0x83.
*
* Brute force search for a match starting with the first value in the
* following id_search_list. This is not a performance issue, since there
* is normally one or some small number of descriptors.
*/
static const struct scsi_id_search_values id_search_list[] = {
{ SCSI_ID_NAA, SCSI_ID_NAA_IEEE_REG_EXTENDED, SCSI_ID_BINARY },
{ SCSI_ID_NAA, SCSI_ID_NAA_IEEE_REG_EXTENDED, SCSI_ID_ASCII },
{ SCSI_ID_NAA, SCSI_ID_NAA_IEEE_REG, SCSI_ID_BINARY },
{ SCSI_ID_NAA, SCSI_ID_NAA_IEEE_REG, SCSI_ID_ASCII },
/*
* Devices already exist using NAA values that are now marked
* reserved. These should not conflict with other values, or it is
* a bug in the device. As long as we find the IEEE extended one
* first, we really don't care what other ones are used. Using
* don't care here means that a device that returns multiple
* non-IEEE descriptors in a random order will get different
* names.
*/
{ SCSI_ID_NAA, SCSI_ID_NAA_DONT_CARE, SCSI_ID_BINARY },
{ SCSI_ID_NAA, SCSI_ID_NAA_DONT_CARE, SCSI_ID_ASCII },
{ SCSI_ID_EUI_64, SCSI_ID_NAA_DONT_CARE, SCSI_ID_BINARY },
{ SCSI_ID_EUI_64, SCSI_ID_NAA_DONT_CARE, SCSI_ID_ASCII },
{ SCSI_ID_T10_VENDOR, SCSI_ID_NAA_DONT_CARE, SCSI_ID_BINARY },
{ SCSI_ID_T10_VENDOR, SCSI_ID_NAA_DONT_CARE, SCSI_ID_ASCII },
{ SCSI_ID_VENDOR_SPECIFIC, SCSI_ID_NAA_DONT_CARE, SCSI_ID_BINARY },
{ SCSI_ID_VENDOR_SPECIFIC, SCSI_ID_NAA_DONT_CARE, SCSI_ID_ASCII },
};
static const char hex_str[]="0123456789abcdef";
/*
* Values returned in the result/status, only the ones used by the code
* are used here.
*/
#define DID_NO_CONNECT 0x01 /* Unable to connect before timeout */
#define DID_BUS_BUSY 0x02 /* Bus remain busy until timeout */
#define DID_TIME_OUT 0x03 /* Timed out for some other reason */
#define DRIVER_TIMEOUT 0x06
#define DRIVER_SENSE 0x08 /* Sense_buffer has been set */
/* The following "category" function returns one of the following */
#define SG_ERR_CAT_CLEAN 0 /* No errors or other information */
#define SG_ERR_CAT_MEDIA_CHANGED 1 /* interpreted from sense buffer */
#define SG_ERR_CAT_RESET 2 /* interpreted from sense buffer */
#define SG_ERR_CAT_TIMEOUT 3
#define SG_ERR_CAT_RECOVERED 4 /* Successful command after recovered err */
#define SG_ERR_CAT_NOTSUPPORTED 5 /* Illegal / unsupported command */
#define SG_ERR_CAT_SENSE 98 /* Something else in the sense buffer */
#define SG_ERR_CAT_OTHER 99 /* Some other error/warning */
static int do_scsi_page80_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
char *serial, char *serial_short, int max_len);
static int sg_err_category_new(struct udev *udev,
int scsi_status, int msg_status, int
host_status, int driver_status, const
unsigned char *sense_buffer, int sb_len)
{
scsi_status &= 0x7e;
/*
* XXX change to return only two values - failed or OK.
*/
if (!scsi_status && !host_status && !driver_status)
return SG_ERR_CAT_CLEAN;
if ((scsi_status == SCSI_CHECK_CONDITION) ||
(scsi_status == SCSI_COMMAND_TERMINATED) ||
((driver_status & 0xf) == DRIVER_SENSE)) {
if (sense_buffer && (sb_len > 2)) {
int sense_key;
unsigned char asc;
if (sense_buffer[0] & 0x2) {
sense_key = sense_buffer[1] & 0xf;
asc = sense_buffer[2];
} else {
sense_key = sense_buffer[2] & 0xf;
asc = (sb_len > 12) ? sense_buffer[12] : 0;
}
if (sense_key == RECOVERED_ERROR)
return SG_ERR_CAT_RECOVERED;
else if (sense_key == UNIT_ATTENTION) {
if (0x28 == asc)
return SG_ERR_CAT_MEDIA_CHANGED;
if (0x29 == asc)
return SG_ERR_CAT_RESET;
} else if (sense_key == ILLEGAL_REQUEST) {
return SG_ERR_CAT_NOTSUPPORTED;
}
}
return SG_ERR_CAT_SENSE;
}
if (!host_status) {
if ((host_status == DID_NO_CONNECT) ||
(host_status == DID_BUS_BUSY) ||
(host_status == DID_TIME_OUT))
return SG_ERR_CAT_TIMEOUT;
}
if (!driver_status) {
if (driver_status == DRIVER_TIMEOUT)
return SG_ERR_CAT_TIMEOUT;
}
return SG_ERR_CAT_OTHER;
}
static int sg_err_category3(struct udev *udev, struct sg_io_hdr *hp)
{
return sg_err_category_new(udev,
hp->status, hp->msg_status,
hp->host_status, hp->driver_status,
hp->sbp, hp->sb_len_wr);
}
static int sg_err_category4(struct udev *udev, struct sg_io_v4 *hp)
{
return sg_err_category_new(udev, hp->device_status, 0,
hp->transport_status, hp->driver_status,
(unsigned char *)(uintptr_t)hp->response,
hp->response_len);
}
static int scsi_dump_sense(struct udev *udev,
struct scsi_id_device *dev_scsi,
unsigned char *sense_buffer, int sb_len)
{
int s;
int code;
int sense_class;
int sense_key;
int asc, ascq;
#ifdef DUMP_SENSE
char out_buffer[256];
int i, j;
#endif
/*
* Figure out and print the sense key, asc and ascq.
*
* If you want to suppress these for a particular drive model, add
* a black list entry in the scsi_id config file.
*
* XXX We probably need to: lookup the sense/asc/ascq in a retry
* table, and if found return 1 (after dumping the sense, asc, and
* ascq). So, if/when we get something like a power on/reset,
* we'll retry the command.
*/
dbg(udev, "got check condition\n");
if (sb_len < 1) {
info(udev, "%s: sense buffer empty\n", dev_scsi->kernel);
return -1;
}
sense_class = (sense_buffer[0] >> 4) & 0x07;
code = sense_buffer[0] & 0xf;
if (sense_class == 7) {
/*
* extended sense data.
*/
s = sense_buffer[7] + 8;
if (sb_len < s) {
info(udev, "%s: sense buffer too small %d bytes, %d bytes too short\n",
dev_scsi->kernel, sb_len, s - sb_len);
return -1;
}
if ((code == 0x0) || (code == 0x1)) {
sense_key = sense_buffer[2] & 0xf;
if (s < 14) {
/*
* Possible?
*/
info(udev, "%s: sense result too" " small %d bytes\n",
dev_scsi->kernel, s);
return -1;
}
asc = sense_buffer[12];
ascq = sense_buffer[13];
} else if ((code == 0x2) || (code == 0x3)) {
sense_key = sense_buffer[1] & 0xf;
asc = sense_buffer[2];
ascq = sense_buffer[3];
} else {
info(udev, "%s: invalid sense code 0x%x\n",
dev_scsi->kernel, code);
return -1;
}
info(udev, "%s: sense key 0x%x ASC 0x%x ASCQ 0x%x\n",
dev_scsi->kernel, sense_key, asc, ascq);
} else {
if (sb_len < 4) {
info(udev, "%s: sense buffer too small %d bytes, %d bytes too short\n",
dev_scsi->kernel, sb_len, 4 - sb_len);
return -1;
}
if (sense_buffer[0] < 15)
info(udev, "%s: old sense key: 0x%x\n", dev_scsi->kernel, sense_buffer[0] & 0x0f);
else
info(udev, "%s: sense = %2x %2x\n",
dev_scsi->kernel, sense_buffer[0], sense_buffer[2]);
info(udev, "%s: non-extended sense class %d code 0x%0x\n",
dev_scsi->kernel, sense_class, code);
}
#ifdef DUMP_SENSE
for (i = 0, j = 0; (i < s) && (j < 254); i++) {
dbg(udev, "i %d, j %d\n", i, j);
out_buffer[j++] = hex_str[(sense_buffer[i] & 0xf0) >> 4];
out_buffer[j++] = hex_str[sense_buffer[i] & 0x0f];
out_buffer[j++] = ' ';
}
out_buffer[j] = '\0';
info(udev, "%s: sense dump:\n", dev_scsi->kernel);
info(udev, "%s: %s\n", dev_scsi->kernel, out_buffer);
#endif
return -1;
}
static int scsi_dump(struct udev *udev,
struct scsi_id_device *dev_scsi, struct sg_io_hdr *io)
{
if (!io->status && !io->host_status && !io->msg_status &&
!io->driver_status) {
/*
* Impossible, should not be called.
*/
info(udev, "%s: called with no error\n", __FUNCTION__);
return -1;
}
info(udev, "%s: sg_io failed status 0x%x 0x%x 0x%x 0x%x\n",
dev_scsi->kernel, io->driver_status, io->host_status, io->msg_status, io->status);
if (io->status == SCSI_CHECK_CONDITION)
return scsi_dump_sense(udev, dev_scsi, io->sbp, io->sb_len_wr);
else
return -1;
}
static int scsi_dump_v4(struct udev *udev,
struct scsi_id_device *dev_scsi, struct sg_io_v4 *io)
{
if (!io->device_status && !io->transport_status &&
!io->driver_status) {
/*
* Impossible, should not be called.
*/
info(udev, "%s: called with no error\n", __FUNCTION__);
return -1;
}
info(udev, "%s: sg_io failed status 0x%x 0x%x 0x%x\n",
dev_scsi->kernel, io->driver_status, io->transport_status,
io->device_status);
if (io->device_status == SCSI_CHECK_CONDITION)
return scsi_dump_sense(udev, dev_scsi, (unsigned char *)(uintptr_t)io->response,
io->response_len);
else
return -1;
}
static int scsi_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
unsigned char evpd, unsigned char page,
unsigned char *buf, unsigned int buflen)
{
unsigned char inq_cmd[INQUIRY_CMDLEN] =
{ INQUIRY_CMD, evpd, page, 0, buflen, 0 };
unsigned char sense[SENSE_BUFF_LEN];
void *io_buf;
int retval;
int retry = 3; /* rather random */
if (buflen > SCSI_INQ_BUFF_LEN) {
info(udev, "buflen %d too long\n", buflen);
return -1;
}
resend:
dbg(udev, "%s evpd %d, page 0x%x\n", dev_scsi->kernel, evpd, page);
if (dev_scsi->use_sg == 4) {
struct sg_io_v4 io_v4;
memset(&io_v4, 0, sizeof(struct sg_io_v4));
io_v4.guard = 'Q';
io_v4.protocol = BSG_PROTOCOL_SCSI;
io_v4.subprotocol = BSG_SUB_PROTOCOL_SCSI_CMD;
io_v4.request_len = sizeof(inq_cmd);
io_v4.request = (uintptr_t)inq_cmd;
io_v4.max_response_len = sizeof(sense);
io_v4.response = (uintptr_t)sense;
io_v4.din_xfer_len = buflen;
io_v4.din_xferp = (uintptr_t)buf;
io_buf = (void *)&io_v4;
} else {
struct sg_io_hdr io_hdr;
memset(&io_hdr, 0, sizeof(struct sg_io_hdr));
io_hdr.interface_id = 'S';
io_hdr.cmd_len = sizeof(inq_cmd);
io_hdr.mx_sb_len = sizeof(sense);
io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
io_hdr.dxfer_len = buflen;
io_hdr.dxferp = buf;
io_hdr.cmdp = inq_cmd;
io_hdr.sbp = sense;
io_hdr.timeout = DEF_TIMEOUT;
io_buf = (void *)&io_hdr;
}
retval = ioctl(fd, SG_IO, io_buf);
if (retval < 0) {
if ((errno == EINVAL || errno == ENOSYS) && dev_scsi->use_sg == 4) {
dev_scsi->use_sg = 3;
goto resend;
}
info(udev, "%s: ioctl failed: %s\n", dev_scsi->kernel, strerror(errno));
goto error;
}
if (dev_scsi->use_sg == 4)
retval = sg_err_category4(udev, io_buf);
else
retval = sg_err_category3(udev, io_buf);
switch (retval) {
case SG_ERR_CAT_NOTSUPPORTED:
buf[1] = 0;
/* Fallthrough */
case SG_ERR_CAT_CLEAN:
case SG_ERR_CAT_RECOVERED:
retval = 0;
break;
default:
if (dev_scsi->use_sg == 4)
retval = scsi_dump_v4(udev, dev_scsi, io_buf);
else
retval = scsi_dump(udev, dev_scsi, io_buf);
}
if (!retval) {
retval = buflen;
} else if (retval > 0) {
if (--retry > 0) {
dbg(udev, "%s: Retrying ...\n", dev_scsi->kernel);
goto resend;
}
retval = -1;
}
error:
if (retval < 0)
info(udev, "%s: Unable to get INQUIRY vpd %d page 0x%x.\n",
dev_scsi->kernel, evpd, page);
return retval;
}
/* Get list of supported EVPD pages */
static int do_scsi_page0_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
unsigned char *buffer, unsigned int len)
{
int retval;
memset(buffer, 0, len);
retval = scsi_inquiry(udev, dev_scsi, fd, 1, 0x0, buffer, len);
if (retval < 0)
return 1;
if (buffer[1] != 0) {
info(udev, "%s: page 0 not available.\n", dev_scsi->kernel);
return 1;
}
if (buffer[3] > len) {
info(udev, "%s: page 0 buffer too long %d\n", dev_scsi->kernel, buffer[3]);
return 1;
}
/*
* Following check is based on code once included in the 2.5.x
* kernel.
*
* Some ill behaved devices return the standard inquiry here
* rather than the evpd data, snoop the data to verify.
*/
if (buffer[3] > MODEL_LENGTH) {
/*
* If the vendor id appears in the page assume the page is
* invalid.
*/
if (!strncmp((char *)&buffer[VENDOR_LENGTH], dev_scsi->vendor, VENDOR_LENGTH)) {
info(udev, "%s: invalid page0 data\n", dev_scsi->kernel);
return 1;
}
}
return 0;
}
/*
* The caller checks that serial is long enough to include the vendor +
* model.
*/
static int prepend_vendor_model(struct udev *udev,
struct scsi_id_device *dev_scsi, char *serial)
{
int ind;
strncpy(serial, dev_scsi->vendor, VENDOR_LENGTH);
strncat(serial, dev_scsi->model, MODEL_LENGTH);
ind = strlen(serial);
/*
* This is not a complete check, since we are using strncat/cpy
* above, ind will never be too large.
*/
if (ind != (VENDOR_LENGTH + MODEL_LENGTH)) {
info(udev, "%s: expected length %d, got length %d\n",
dev_scsi->kernel, (VENDOR_LENGTH + MODEL_LENGTH), ind);
return -1;
}
return ind;
}
/**
* check_fill_0x83_id - check the page 0x83 id, if OK allocate and fill
* serial number.
**/
static int check_fill_0x83_id(struct udev *udev,
struct scsi_id_device *dev_scsi,
unsigned char *page_83,
const struct scsi_id_search_values
*id_search, char *serial, char *serial_short, int max_len,
char *wwn,
char *wwn_vendor_extension)
{
int i, j, s, len;
/*
* ASSOCIATION must be with the device (value 0)
*/
if ((page_83[1] & 0x30) != 0)
return 1;
if ((page_83[1] & 0x0f) != id_search->id_type)
return 1;
/*
* Possibly check NAA sub-type.
*/
if ((id_search->naa_type != SCSI_ID_NAA_DONT_CARE) &&
(id_search->naa_type != (page_83[4] & 0xf0) >> 4))
return 1;
/*
* Check for matching code set - ASCII or BINARY.
*/
if ((page_83[0] & 0x0f) != id_search->code_set)
return 1;
/*
* page_83[3]: identifier length
*/
len = page_83[3];
if ((page_83[0] & 0x0f) != SCSI_ID_ASCII)
/*
* If not ASCII, use two bytes for each binary value.
*/
len *= 2;
/*
* Add one byte for the NUL termination, and one for the id_type.
*/
len += 2;
if (id_search->id_type == SCSI_ID_VENDOR_SPECIFIC)
len += VENDOR_LENGTH + MODEL_LENGTH;
if (max_len < len) {
info(udev, "%s: length %d too short - need %d\n",
dev_scsi->kernel, max_len, len);
return 1;
}
serial[0] = hex_str[id_search->id_type];
/*
* For SCSI_ID_VENDOR_SPECIFIC prepend the vendor and model before
* the id since it is not unique across all vendors and models,
* this differs from SCSI_ID_T10_VENDOR, where the vendor is
* included in the identifier.
*/
if (id_search->id_type == SCSI_ID_VENDOR_SPECIFIC)
if (prepend_vendor_model(udev, dev_scsi, &serial[1]) < 0) {
dbg(udev, "prepend failed\n");
return 1;
}
i = 4; /* offset to the start of the identifier */
s = j = strlen(serial);
if ((page_83[0] & 0x0f) == SCSI_ID_ASCII) {
/*
* ASCII descriptor.
*/
while (i < (4 + page_83[3]))
serial[j++] = page_83[i++];
} else {
/*
* Binary descriptor, convert to ASCII, using two bytes of
* ASCII for each byte in the page_83.
*/
while (i < (4 + page_83[3])) {
serial[j++] = hex_str[(page_83[i] & 0xf0) >> 4];
serial[j++] = hex_str[page_83[i] & 0x0f];
i++;
}
}
strcpy(serial_short, &serial[s]);
if (id_search->id_type == SCSI_ID_NAA && wwn != NULL) {
strncpy(wwn, &serial[s], 16);
if (wwn_vendor_extension != NULL) {
strncpy(wwn_vendor_extension, &serial[s + 16], 16);
}
}
return 0;
}
/* Extract the raw binary from VPD 0x83 pre-SPC devices */
static int check_fill_0x83_prespc3(struct udev *udev,
struct scsi_id_device *dev_scsi,
unsigned char *page_83,
const struct scsi_id_search_values
*id_search, char *serial, char *serial_short, int max_len)
{
int i, j;
dbg(udev, "using pre-spc3-83 for %s\n", dev_scsi->kernel);
serial[0] = hex_str[id_search->id_type];
/* serial has been memset to zero before */
j = strlen(serial); /* j = 1; */
for (i = 0; (i < page_83[3]) && (j < max_len-3); ++i) {
serial[j++] = hex_str[(page_83[4+i] & 0xf0) >> 4];
serial[j++] = hex_str[ page_83[4+i] & 0x0f];
}
serial[max_len-1] = 0;
strncpy(serial_short, serial, max_len-1);
return 0;
}
/* Get device identification VPD page */
static int do_scsi_page83_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
char *serial, char *serial_short, int len,
char *unit_serial_number, char *wwn,
char *wwn_vendor_extension)
{
int retval;
unsigned int id_ind, j;
unsigned char page_83[SCSI_INQ_BUFF_LEN];
/* also pick up the page 80 serial number */
do_scsi_page80_inquiry(udev, dev_scsi, fd, NULL, unit_serial_number, MAX_SERIAL_LEN);
memset(page_83, 0, SCSI_INQ_BUFF_LEN);
retval = scsi_inquiry(udev, dev_scsi, fd, 1, PAGE_83, page_83,
SCSI_INQ_BUFF_LEN);
if (retval < 0)
return 1;
if (page_83[1] != PAGE_83) {
info(udev, "%s: Invalid page 0x83\n", dev_scsi->kernel);
return 1;
}
/*
* XXX Some devices (IBM 3542) return all spaces for an identifier if
* the LUN is not actually configured. This leads to identifiers of
* the form: "1 ".
*/
/*
* Model 4, 5, and (some) model 6 EMC Symmetrix devices return
* a page 83 reply according to SCSI-2 format instead of SPC-2/3.
*
* The SCSI-2 page 83 format returns an IEEE WWN in binary
* encoded hexi-decimal in the 16 bytes following the initial
* 4-byte page 83 reply header.
*
* Both the SPC-2 and SPC-3 formats return an IEEE WWN as part
* of an Identification descriptor. The 3rd byte of the first
* Identification descriptor is a reserved (BSZ) byte field.
*
* Reference the 7th byte of the page 83 reply to determine
* whether the reply is compliant with SCSI-2 or SPC-2/3
* specifications. A zero value in the 7th byte indicates
* an SPC-2/3 conformant reply, (i.e., the reserved field of the
* first Identification descriptor). This byte will be non-zero
* for a SCSI-2 conformant page 83 reply from these EMC
* Symmetrix models since the 7th byte of the reply corresponds
* to the 4th and 5th nibbles of the 6-byte OUI for EMC, that is,
* 0x006048.
*/
if (page_83[6] != 0)
return check_fill_0x83_prespc3(udev,
dev_scsi, page_83, id_search_list,
serial, serial_short, len);
/*
* Search for a match in the prioritized id_search_list - since WWN ids
* come first we can pick up the WWN in check_fill_0x83_id().
*/
for (id_ind = 0;
id_ind < sizeof(id_search_list)/sizeof(id_search_list[0]);
id_ind++) {
/*
* Examine each descriptor returned. There is normally only
* one or a small number of descriptors.
*/
for (j = 4; j <= (unsigned int)page_83[3] + 3; j += page_83[j + 3] + 4) {
retval = check_fill_0x83_id(udev,
dev_scsi, &page_83[j],
&id_search_list[id_ind],
serial, serial_short, len,
wwn,
wwn_vendor_extension);
dbg(udev, "%s id desc %d/%d/%d\n", dev_scsi->kernel,
id_search_list[id_ind].id_type,
id_search_list[id_ind].naa_type,
id_search_list[id_ind].code_set);
if (!retval) {
dbg(udev, " used\n");
return retval;
} else if (retval < 0) {
dbg(udev, " failed\n");
return retval;
} else {
dbg(udev, " not used\n");
}
}
}
return 1;
}
/*
* Get device identification VPD page for older SCSI-2 device which is not
* compliant with either SPC-2 or SPC-3 format.
*
* Return the hard coded error code value 2 if the page 83 reply is not
* conformant to the SCSI-2 format.
*/
static int do_scsi_page83_prespc3_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
char *serial, char *serial_short, int len)
{
int retval;
int i, j;
unsigned char page_83[SCSI_INQ_BUFF_LEN];
memset(page_83, 0, SCSI_INQ_BUFF_LEN);
retval = scsi_inquiry(udev, dev_scsi, fd, 1, PAGE_83, page_83, SCSI_INQ_BUFF_LEN);
if (retval < 0)
return 1;
if (page_83[1] != PAGE_83) {
info(udev, "%s: Invalid page 0x83\n", dev_scsi->kernel);
return 1;
}
/*
* Model 4, 5, and (some) model 6 EMC Symmetrix devices return
* a page 83 reply according to SCSI-2 format instead of SPC-2/3.
*
* The SCSI-2 page 83 format returns an IEEE WWN in binary
* encoded hexi-decimal in the 16 bytes following the initial
* 4-byte page 83 reply header.
*
* Both the SPC-2 and SPC-3 formats return an IEEE WWN as part
* of an Identification descriptor. The 3rd byte of the first
* Identification descriptor is a reserved (BSZ) byte field.
*
* Reference the 7th byte of the page 83 reply to determine
* whether the reply is compliant with SCSI-2 or SPC-2/3
* specifications. A zero value in the 7th byte indicates
* an SPC-2/3 conformant reply, (i.e., the reserved field of the
* first Identification descriptor). This byte will be non-zero
* for a SCSI-2 conformant page 83 reply from these EMC
* Symmetrix models since the 7th byte of the reply corresponds
* to the 4th and 5th nibbles of the 6-byte OUI for EMC, that is,
* 0x006048.
*/
if (page_83[6] == 0)
return 2;
serial[0] = hex_str[id_search_list[0].id_type];
/*
* The first four bytes contain data, not a descriptor.
*/
i = 4;
j = strlen(serial);
/*
* Binary descriptor, convert to ASCII,
* using two bytes of ASCII for each byte
* in the page_83.
*/
while (i < (page_83[3]+4)) {
serial[j++] = hex_str[(page_83[i] & 0xf0) >> 4];
serial[j++] = hex_str[page_83[i] & 0x0f];
i++;
}
dbg(udev, "using pre-spc3-83 for %s\n", dev_scsi->kernel);
return 0;
}
/* Get unit serial number VPD page */
static int do_scsi_page80_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
char *serial, char *serial_short, int max_len)
{
int retval;
int ser_ind;
int i;
int len;
unsigned char buf[SCSI_INQ_BUFF_LEN];
memset(buf, 0, SCSI_INQ_BUFF_LEN);
retval = scsi_inquiry(udev, dev_scsi, fd, 1, PAGE_80, buf, SCSI_INQ_BUFF_LEN);
if (retval < 0)
return retval;
if (buf[1] != PAGE_80) {
info(udev, "%s: Invalid page 0x80\n", dev_scsi->kernel);
return 1;
}
len = 1 + VENDOR_LENGTH + MODEL_LENGTH + buf[3];
if (max_len < len) {
info(udev, "%s: length %d too short - need %d\n",
dev_scsi->kernel, max_len, len);
return 1;
}
/*
* Prepend 'S' to avoid unlikely collision with page 0x83 vendor
* specific type where we prepend '0' + vendor + model.
*/
len = buf[3];
if (serial != NULL) {
serial[0] = 'S';
ser_ind = prepend_vendor_model(udev, dev_scsi, &serial[1]);
if (ser_ind < 0)
return 1;
for (i = 4; i < len + 4; i++, ser_ind++)
serial[ser_ind] = buf[i];
}
if (serial_short != NULL) {
memcpy(serial_short, &buf[4], len);
serial_short[len] = '\0';
}
return 0;
}
int scsi_std_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, const char *devname)
{
int fd;
unsigned char buf[SCSI_INQ_BUFF_LEN];
struct stat statbuf;
int err = 0;
dbg(udev, "opening %s\n", devname);
fd = open(devname, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
info(udev, "scsi_id: cannot open %s: %s\n",
devname, strerror(errno));
return 1;
}
if (fstat(fd, &statbuf) < 0) {
info(udev, "scsi_id: cannot stat %s: %s\n",
devname, strerror(errno));
err = 2;
goto out;
}
sprintf(dev_scsi->kernel,"%d:%d", major(statbuf.st_rdev),
minor(statbuf.st_rdev));
memset(buf, 0, SCSI_INQ_BUFF_LEN);
err = scsi_inquiry(udev, dev_scsi, fd, 0, 0, buf, SCSI_INQ_BUFF_LEN);
if (err < 0)
goto out;
err = 0;
memcpy(dev_scsi->vendor, buf + 8, 8);
dev_scsi->vendor[8] = '\0';
memcpy(dev_scsi->model, buf + 16, 16);
dev_scsi->model[16] = '\0';
memcpy(dev_scsi->revision, buf + 32, 4);
dev_scsi->revision[4] = '\0';
sprintf(dev_scsi->type,"%x", buf[0] & 0x1f);
out:
close(fd);
return err;
}
int scsi_get_serial(struct udev *udev,
struct scsi_id_device *dev_scsi, const char *devname,
int page_code, int len)
{
unsigned char page0[SCSI_INQ_BUFF_LEN];
int fd = -1;
int cnt;
int ind;
int retval;
memset(dev_scsi->serial, 0, len);
dbg(udev, "opening %s\n", devname);
srand((unsigned int)getpid());
for (cnt = 20; cnt > 0; cnt--) {
struct timespec duration;
fd = open(devname, O_RDONLY | O_NONBLOCK);
if (fd >= 0 || errno != EBUSY)
break;
duration.tv_sec = 0;
duration.tv_nsec = (200 * 1000 * 1000) + (rand() % 100 * 1000 * 1000);
nanosleep(&duration, NULL);
}
if (fd < 0)
return 1;
if (page_code == PAGE_80) {
if (do_scsi_page80_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len)) {
retval = 1;
goto completed;
} else {
retval = 0;
goto completed;
}
} else if (page_code == PAGE_83) {
if (do_scsi_page83_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len, dev_scsi->unit_serial_number, dev_scsi->wwn, dev_scsi->wwn_vendor_extension)) {
retval = 1;
goto completed;
} else {
retval = 0;
goto completed;
}
} else if (page_code == PAGE_83_PRE_SPC3) {
retval = do_scsi_page83_prespc3_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len);
if (retval) {
/*
* Fallback to servicing a SPC-2/3 compliant page 83
* inquiry if the page 83 reply format does not
* conform to pre-SPC3 expectations.
*/
if (retval == 2) {
if (do_scsi_page83_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len, dev_scsi->unit_serial_number, dev_scsi->wwn, dev_scsi->wwn_vendor_extension)) {
retval = 1;
goto completed;
} else {
retval = 0;
goto completed;
}
}
else {
retval = 1;
goto completed;
}
} else {
retval = 0;
goto completed;
}
} else if (page_code != 0x00) {
info(udev, "%s: unsupported page code 0x%d\n", dev_scsi->kernel, page_code);
return 1;
}
/*
* Get page 0, the page of the pages. By default, try from best to
* worst of supported pages: 0x83 then 0x80.
*/
if (do_scsi_page0_inquiry(udev, dev_scsi, fd, page0, SCSI_INQ_BUFF_LEN)) {
/*
* Don't try anything else. Black list if a specific page
* should be used for this vendor+model, or maybe have an
* optional fall-back to page 0x80 or page 0x83.
*/
retval = 1;
goto completed;
}
dbg(udev, "%s: Checking page0\n", dev_scsi->kernel);
for (ind = 4; ind <= page0[3] + 3; ind++)
if (page0[ind] == PAGE_83)
if (!do_scsi_page83_inquiry(udev, dev_scsi, fd,
dev_scsi->serial, dev_scsi->serial_short, len, dev_scsi->unit_serial_number, dev_scsi->wwn, dev_scsi->wwn_vendor_extension)) {
/*
* Success
*/
retval = 0;
goto completed;
}
for (ind = 4; ind <= page0[3] + 3; ind++)
if (page0[ind] == PAGE_80)
if (!do_scsi_page80_inquiry(udev, dev_scsi, fd,
dev_scsi->serial, dev_scsi->serial_short, len)) {
/*
* Success
*/
retval = 0;
goto completed;
}
retval = 1;
completed:
close(fd);
return retval;
}
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