Geographic naming of devices using Udev for ATCA system.

Geographic naming of devices using Udev for ATCA system.

[Sabharwal, Atul]

Hi Greg,

I have developed a callout routine for ATCA based chassis systems where
we can generate
Descriptive device names based on geographic information of the device.
The geographic information being chasis#, slot# and host adaptor#.  The
end results is a name tree which is three Level deep instead of the
usual one level tree. 

The user has to Manually provision the disk(s) in a file (provision.tbl)
file and the chassis_id callout uses Scsi_id to find the serial# of the
device. The serial# being the key to
Get the geographic information.

Would you be interested in including this into udev as an extra module ?
Or is it too custom
In nature and does not belong here ?
 
Thanks,

Atul

-------------------------------------------------------------
P.S:  All opinions are my personal opinion(s) & responsibility and do
not represent the view of my employer ( Intel Corporation ).



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Re: Geographic naming of devices using Udev for ATCA system.

[Greg KH]

On Thu, Mar 25, 2004 at 06:41:51PM -0800, Sabharwal, Atul wrote:
> Hi Greg,

Ick, don't use my us.ibm.com email address for udev stuff, it will get
lost there...

> I have developed a callout routine for ATCA based chassis systems where
> we can generate
> Descriptive device names based on geographic information of the device.
> The geographic information being chasis#, slot# and host adaptor#.  The
> end results is a name tree which is three Level deep instead of the
> usual one level tree. 
> 
> The user has to Manually provision the disk(s) in a file (provision.tbl)
> file and the chassis_id callout uses Scsi_id to find the serial# of the
> device. The serial# being the key to
> Get the geographic information.
> 
> Would you be interested in including this into udev as an extra module ?
> Or is it too custom In nature and does not belong here ?

Don't know, care to send a patch to the udev tree that adds your program
to the extras/ directory?  Then we can take a look and determine if it
should be in the tarball or not.

thanks,

greg k-h


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RE: Geographic naming of devices using Udev for ATCA system.

[Sabharwal, Atul]

[-- Attachment #1: Type: text/plain, Size: 419 bytes --]


>> Would you be interested in including this into udev as an extra
module ?
>> Or is it too custom In nature and does not belong here ?

>Don't know, care to send a patch to the udev tree that adds your
program
>to the extras/ directory?  Then we can take a look and determine if it
>should be in the tarball or not.

Patch file attached with mail in Unix format against Udev-023 tree.

Thanks,

Atul


[-- Attachment #2: chassis_id.patch --]
[-- Type: application/octet-stream, Size: 8654 bytes --]

diff -Nur udev-023.org/extras/chassis_id/chassis_id.c udev-023/extras/chassis_id/chassis_id.c
--- udev-023.org/extras/chassis_id/chassis_id.c	1969-12-31 16:00:00.000000000 -0800
+++ udev-023/extras/chassis_id/chassis_id.c	2004-03-25 11:28:06.146140984 -0800
@@ -0,0 +1,112 @@
+
+  /* -*-c-*-: 
+   **
+   ** (C) 2003 Intel Corporation
+   **          Atul Sabharwal <atul.sabharwal@intel.com>
+   **
+   ** $Id: chassis_id.c,v 1.8 2004/03/22 23:33:10 atul Exp $
+   **
+   ** Distributed under the terms of the GNU Public License, v2.0 or
+   ** later.
+   **
+   ** Many parts heavily based on test-skeleton.c, by Ulrich Drepper;
+   ** with his permission, they have been re-licensed GPL, and his
+   ** copyright still applies on them. 
+   **
+   */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <syslog.h>
+
+#include "chassis_id.h"
+
+//#define DEBUG              1
+
+int main(int argc, char **argv, char ** envp)
+{
+     int chassis_num, slot_num, retval, host_num;
+     char disk_snum[255], devpath[255];
+     char * ptr;
+     int disk_index;
+
+      syslog( LOG_PID| LOG_DAEMON| LOG_ERR, "\n%s", "starting chassis_id" );
+
+#if 0
+     ptr = (char *) getenv( "CHASSIS");
+     if( ptr == NULL )
+          return -ERROR_NO_CHASSIS;
+
+     sscanf(ptr, "%d", &chassis_num);
+     #ifdef DEBUG
+        syslog(LOG_PID| LOG_DAEMON| LOG_ERR, "Chassis %d", chassis_num);
+     #endif
+
+
+     ptr = (char *) getenv( "SLOT" );
+     if( ptr== NULL )
+          return -ERROR_NO_SLOT;
+
+     sscanf(ptr, "%d", &slot_num);
+     #ifdef DEBUG
+        syslog( LOG_PID|LOG_DAEMON| LOG_ERR, "Slot %d", slot_num);
+     #endif
+#endif
+     ptr = (char *) getenv( "DEVPATH");
+     if( ptr == NULL )
+          return -ERROR_NO_DEVPATH;
+
+     sscanf(ptr, "%s", &devpath[0]);
+     #ifdef DEBUG
+        syslog( LOG_PID|LOG_DAEMON| LOG_ERR, "Devpath %s", devpath);
+     #endif
+
+     retval = table_init();
+     if(retval < 0 )
+        return -ERROR_BAD_TABLE;
+     
+     getserial_number( devpath, disk_snum);
+     
+
+     /* Now we open the provisioning table t find actual entry for the serial number*/
+     disk_index =  table_find_disk(disk_snum, &host_num, &chassis_num, &slot_num);
+     if ( disk_index == -1 )
+     {
+        //typical provisioning error
+        return -ERROR_NO_DISK;
+     }
+     else
+     {
+        table_select_disk( disk_index );
+     }
+     return 0;
+}
+
+
+/* Run SCSI id to find serial number of the device */
+int getserial_number( char * devpath, char * snumber )
+{
+   FILE *fp; 
+   char vendor [255], model[255], cmd[255];
+   int retval;
+
+   sprintf(cmd, "/sbin/scsi_id -s %s -p 0x80", devpath);
+
+   fp = popen( cmd, "r");
+
+   if (fp == NULL)
+         return -ERROR_BAD_SNUMBER;
+
+   fscanf( fp, "%s %s %s", vendor, model, snumber);
+   #ifdef DEBUG
+   	syslog( LOG_PID| LOG_DAEMON| LOG_ERR, "\n%s", snumber );
+   #endif
+
+   retval = pclose(fp);
+   if (retval == -1)
+         return -ERROR_BAD_SNUMBER;
+   else
+         return NO_ERROR;
+
+}
+
diff -Nur udev-023.org/extras/chassis_id/chassis_id.h udev-023/extras/chassis_id/chassis_id.h
--- udev-023.org/extras/chassis_id/chassis_id.h	1969-12-31 16:00:00.000000000 -0800
+++ udev-023/extras/chassis_id/chassis_id.h	2004-03-25 11:28:01.143901440 -0800
@@ -0,0 +1,34 @@
+
+  /* -*-c-*-: 
+   **
+   ** (C) 2003 Intel Corporation
+   **          Atul Sabharwal <atul.sabharwal@intel.com>
+   **
+   ** $Id: chassis_id.h,v 1.1 2004/03/16 18:24:44 atul Exp $
+   **
+   ** Distributed under the terms of the GNU Public License, v2.0 or
+   ** later.
+   **
+   ** Many parts heavily based on test-skeleton.c, by Ulrich Drepper;
+   ** with his permission, they have been re-licensed GPL, and his
+   ** copyright still applies on them. 
+   **
+   */
+
+#ifndef _CHASSIS_ID_H
+#define _CHASSIS_ID_H
+
+//#define DEBUG              1
+#define ERROR              1
+#define ERROR_NO_SLOT      2
+#define ERROR_NO_CHASSIS   3
+#define ERROR_NO_DEVPATH   4
+#define ERROR_BAD_SNUMBER  5
+#define ERROR_NO_DISK      6
+#define ERROR_BAD_TABLE    7
+#define ERROR_BAD_SCAN     8
+#define NO_ERROR           0
+
+extern int table_init();
+
+#endif
diff -Nur udev-023.org/extras/chassis_id/Makefile udev-023/extras/chassis_id/Makefile
--- udev-023.org/extras/chassis_id/Makefile	1969-12-31 16:00:00.000000000 -0800
+++ udev-023/extras/chassis_id/Makefile	2004-03-25 11:28:47.248892416 -0800
@@ -0,0 +1,26 @@
+#
+#   **
+#   ** (C) 2003 Intel Corporation
+#   **          Atul Sabharwal <atul.sabharwal@intel.com>
+#   **
+#   ** $Id: Makefile,v 1.3 2004/03/22 23:54:54 atul Exp $
+#   **
+#   ** Distributed under the terms of the GNU Public License, v2.0 or
+#   ** later.
+#   **
+#   ** Many parts heavily based on test-skeleton.c, by Ulrich Drepper;
+#   ** with his permission, they have been re-licensed GPL, and his
+#   ** copyright still applies on them. 
+#   **
+#   */
+#
+CFLAGS = -g 
+TARGET = chassis_id
+
+all:	chassis_id  
+
+chassis_id:	chassis_id.c table.c
+	gcc -o $(TARGET) $(CFLAGS) chassis_id.c table.c
+
+clean:	
+	rm -rf core a.out $(TARGET)
diff -Nur udev-023.org/extras/chassis_id/provision.tbl udev-023/extras/chassis_id/provision.tbl
--- udev-023.org/extras/chassis_id/provision.tbl	1969-12-31 16:00:00.000000000 -0800
+++ udev-023/extras/chassis_id/provision.tbl	2004-03-25 11:27:40.061106512 -0800
@@ -0,0 +1,5 @@
+id  host   number_of_disks     chassis#    slot#   serial#                  name
+1    1   	2		1	    2	   3BM07NKA000070456Z6B	    disk1
+2    1  	2		1	    2	   3BM07R68000070456ZCK	    disk2
+3    2          2		1	    3	   3EV08ANK00007219JAVA	    disk3
+4    2          2		1	    4	   3EV00NZB000072190Y90	    disk4
diff -Nur udev-023.org/extras/chassis_id/table.c udev-023/extras/chassis_id/table.c
--- udev-023.org/extras/chassis_id/table.c	1969-12-31 16:00:00.000000000 -0800
+++ udev-023/extras/chassis_id/table.c	2004-03-25 11:27:49.381689568 -0800
@@ -0,0 +1,102 @@
+  /* -*-c-*-: 
+   **
+   ** (C) 2003 Intel Corporation
+   **          Atul Sabharwal <atul.sabharwal@intel.com>
+   **
+   ** $Id: table.c,v 1.4 2004/03/18 21:56:24 atul Exp $
+   **
+   ** Distributed under the terms of the GNU Public License, v2.0 or
+   ** later.
+   **
+   ** Many parts heavily based on test-skeleton.c, by Ulrich Drepper;
+   ** with his permission, they have been re-licensed GPL, and his
+   ** copyright still applies on them. 
+   **
+   */
+
+#include <stdio.h>
+#define TABLE_SIZE 100
+#define PROVISION_DB  "/usr/local/bin/provision.tbl"
+
+struct provision_record
+{
+    int  id;
+    int  host_num;          //port # or adaptor number
+    int  num_disks;
+    int  chassis_num;
+    int  slot_num;
+    char serial_num[32];
+    char name[32];
+
+} ptable[TABLE_SIZE];
+
+int ptable_size;
+
+/* Initialize the provisioning table by reading the data from special file provision.tbl *
+   Return error if something does not work appropriately.                                */
+int table_init()
+{
+   FILE *fp;
+   char ptr[255];
+   int i;
+   
+   fp=fopen( PROVISION_DB, "r");
+
+   if ((fp== NULL) || feof(fp))
+        return -1;
+
+   //skip the first line of text which contains descriptive details.
+   fgets(ptr, 80, fp);	
+   i = 0;
+   while (!feof(fp))
+   {
+       fgets(ptr, 80, fp);	
+       sscanf( ptr, "%d %d %d %d %d %s %s", &ptable[i].id, &ptable[i].host_num, 
+            &ptable[i].num_disks, &ptable[i].chassis_num, &ptable[i].slot_num, 
+              ptable[i].serial_num, ptable[i].name );
+       i++;       
+   }  
+
+   ptable_size = i;
+   fclose(fp);
+   return 0;
+}
+
+
+/*  return -1 when no disk found. Otherwise return index of disk */
+int table_find_disk( char * serialnumber , int * host_num, int * chassis_num, int *slot_num)
+{
+    
+   int i;
+ 
+   for(i = 0; i < ptable_size; i++)
+   {
+
+      if(strcmp(ptable[i].serial_num, serialnumber) == 0)
+      {
+
+            *host_num =  ptable[i].host_num;
+            *chassis_num =  ptable[i].chassis_num;
+            *slot_num = ptable[i].slot_num;
+            break;
+      }
+   }
+
+   if(i == ptable_size)
+       return -1;
+   else
+       return i;
+}
+
+/* This function is primarily there for passing the selected disk entry to udev so that *
+ * it can create descriptive GDN for it. So, for that we need to output this data to    *
+ * stdout.                                                                              */
+int table_select_disk( int diskindex )
+{
+   printf("%d ", ptable[diskindex].chassis_num);
+   printf("%d ", ptable[diskindex].slot_num);
+   printf("%d ", ptable[diskindex].host_num);
+   printf("%s ", ptable[diskindex].name);
+
+}
+

RE: Geographic naming of devices using Udev for ATCA system.

[Sabharwal, Atul]

The udev rule to get GDN working is as below ::

--
Atul

BUS="scsi", PROGRAM="/usr/local/bin/chassis_id",
NAME="/chassis%c{1}/slot%c{2}/host%c{3}/disk-%c{4}" 


-------------------------------------------------------------
P.S:  All opinions are my personal opinion(s) & responsibility and do
not represent the view of my employer ( Intel Corporation ).

-----Original Message-----
From: linux-hotplug-devel-admin@lists.sourceforge.net
[mailto:linux-hotplug-devel-admin@lists.sourceforge.net] On Behalf Of
Sabharwal, Atul
Sent: Friday, March 26, 2004 11:00 AM
To: Greg KH
Cc: hotplug
Subject: RE: Geographic naming of devices using Udev for ATCA system.


>> Would you be interested in including this into udev as an extra
module ?
>> Or is it too custom In nature and does not belong here ?

>Don't know, care to send a patch to the udev tree that adds your
program
>to the extras/ directory?  Then we can take a look and determine if it
>should be in the tarball or not.

Patch file attached with mail in Unix format against Udev-023 tree.

Thanks,

Atul




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Re: Geographic naming of devices using Udev for ATCA system.

[Greg KH]

On Fri, Mar 26, 2004 at 11:00:20AM -0800, Sabharwal, Atul wrote:
> 
> >> Would you be interested in including this into udev as an extra
> module ?
> >> Or is it too custom In nature and does not belong here ?
> 
> >Don't know, care to send a patch to the udev tree that adds your
> program
> >to the extras/ directory?  Then we can take a look and determine if it
> >should be in the tarball or not.
> 
> Patch file attached with mail in Unix format against Udev-023 tree.

Thanks, I've applied this patch, and then cleaned up the coding style of
the .c and .h files.

greg k-h


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Re: Geographic naming of devices using Udev for ATCA system.

[Greg KH]

On Fri, Mar 26, 2004 at 11:10:30AM -0800, Sabharwal, Atul wrote:
> The udev rule to get GDN working is as below ::
> 
> --
> Atul
> 
> BUS="scsi", PROGRAM="/usr/local/bin/chassis_id",
> NAME="/chassis%c{1}/slot%c{2}/host%c{3}/disk-%c{4}" 

Care to send in a patch that adds a README file that shows this usage?
Without it, it would be hard for users to determine this.

thanks,

greg k-h


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RE: Geographic naming of devices using Udev for ATCA system.

[Sabharwal, Atul]

[-- Attachment #1: Type: text/plain, Size: 748 bytes --]


>>Care to send in a patch that adds a README file that shows this usage?
>>Without it, it would be hard for users to determine this.

Done.  This addes the Readme file. 
--
Atul




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[-- Attachment #2: readme.patch --]
[-- Type: application/octet-stream, Size: 1568 bytes --]

Binary files udev-023.org/extras/chassis_id/chassis_id and udev-023/extras/chassis_id/chassis_id differ
diff -Nur udev-023.org/extras/chassis_id/README udev-023/extras/chassis_id/README
--- udev-023.org/extras/chassis_id/README	1969-12-31 16:00:00.000000000 -0800
+++ udev-023/extras/chassis_id/README	2004-03-31 10:43:18.268636088 -0800
@@ -0,0 +1,28 @@
+                                     README.txt
+                                     ~~~~~~~~~~
+Chassis_id is a callout program which is used to give geographic names to devices.  It uses
+another callout program scsi_id to determine the serial number of a device and then looks up
+the provisioning table based on this key. It retrieves  geographic information 
+( chassis#, slot# and host# ) about the device and prints it to stdout. These fields are
+used by udev to create the device entry.
+
+Using Udev:
+~~~~~~~~~~
+Chassis_id gets invoked by udev using the udev as below:
+
+BUS="scsi", PROGRAM="/usr/local/bin/chassis_id", NAME="/chassis%c{1}/slot%c{2}/host%c{3}/disk-%c{4}
+
+The provisioning table ( file provision.tbl ) has to be put in /usr/local/bin and as of now has
+to be populated manually. This is the only place where the geographic map of devices is kept
+in the system.
+
+
+Usage Model:
+~~~~~~~~~~~~
+On ATCA based blade architecture systems, blade insertion/removal is common. We create names
+in a 3 level deep tree which represent the geographic map of the devices.
+
+
+CONTACT:
+~~~~~~~~
+Please feel free to contact atul.sabharwal@intel.com with questions, comments, suggestions.

Re: Geographic naming of devices using Udev for ATCA system.

[Greg KH]

On Wed, Mar 31, 2004 at 11:03:27AM -0800, Sabharwal, Atul wrote:
> 
> >>Care to send in a patch that adds a README file that shows this usage?
> >>Without it, it would be hard for users to determine this.
> 
> Done.  This addes the Readme file. 

Applied, thanks.

greg k-h


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