struct "has no member named first"

Hey,
you see this error message from gcc?
It is defined as a function in include/linux/list.h, line 37.
It is a good idea to look at the linux kernel list implementation:
good examples are:
http://isis.poly.edu/kulesh/stuff/src/klist/ or
http://kernelnewbies.org/FAQ/LinkedLists.

Or you simple tried the hlist_node to be hlist_head.

Kernel source code browsing

Hey,
a quick guide for browsing source code with Vi editor.
At first we need: source code (e.g. kernel-source), the vim editor, ctags (tool for generating tag files) and cscope (tool for browsing C code). This packages are all included in the OpenSUSE 10.3.

Next you need to index all files which should be browse able later, do it with 'find | grep "\.c$\|\.h$" > cscope.files' (of course in the top of your source code directory).

After this you have to build the cscope database, with "cscope -b" (for recursive build, start it in the top directory of your source code).
Afterwards build the tag database with "ctags -L cscope.files" (this is needed for code completion).

Next is to tell vim about it: do this with adding the support (key-bindings) in your vimrc. Download this vim_rc and append it to your vimrc (mostly $HOME/.vimrc). After this, the ctag/cscope key support should be enabled (of course a vi restart is needed).

Ctrl-']' brings you the definition, Ctrl-t brings you back.

The key binding is: (all with CTRL-'\'-'key'):
's' (symbol) find all references to the token under cursor
'g' (global) find global definition(s) of the token under cursor
'c' (calls) find all calls to the function name under cursor
't' (text) find all instances of the text under cursor
'e' (egrep) egrep search for the word under cursor
'f' (file) open the filename under cursor
'i' (includes) find files that include the filename under cursor
'd' (called) find functions that function under cursor calls

So hope this helps.

Connect two virtual machines within Vmware with serial line

Hey,
I recently triggered a problem in Vmware (version 1.0.3, Linux), that it is not possible to use the given "Virtual Machine Settings" -> "Use named pipe" -> "The other end is a virtual machine" feature. There was no serial communication between my two OpenSUSE 10.3 test machines. To workaround this I used the socat tool. With socat unix-connect:./pipe unix-connect:/mnt/vmware-machines/Virtual\ Machines/SUSE\ Linux/pipe it was possible to get the serial communication working. Although Vmware says that it creates a pipe, it is represented as a unix socket. Before setting up the socat proxy, you should configure the serial ports in the virtual machines. Doing this via "Virtual Machine Settings" (right-click in the right bottom of the Window) -> "Use named pipe" -> Enter a name for the named pipe, configure "This end is the server" and important the last option, configure "The other end is an application". After setting this for me a reboot is needed. After reboot your choosen filename is created and available for socat connect.

A nice step for debugging, is "socat unix-connect:./pipe stdout".

Some hint from me, if you see a flooding on the serial line, you probably have enabled the shell with login prompt on both serial lines, so the are trying to login each other :-) .

VMware fuzzy?!

Hey there,
for the moment I wanted to use the VMware server version 1.0.3 (from 4/26/07, Build 44356) for Linux. And it goes woooh with OpenSUSE 10.3 (x86_64):

Using 2.6.x kernel build system.
make: Entering directory `/tmp/vmware-config1/vmnet-only'
make -C /lib/modules/2.6.22.5-31-default/build/include/.. SUBDIRS=$PWD SRCROOT=$PWD/. modules
make[1]: Entering directory `/usr/src/linux-2.6.22.5-31'
 CC [M]  /tmp/vmware-config1/vmnet-only/driver.o
 CC [M]  /tmp/vmware-config1/vmnet-only/hub.o
 CC [M]  /tmp/vmware-config1/vmnet-only/userif.o
/tmp/vmware-config1/vmnet-only/userif.c: In function ‘VNetCopyDatagramToUser’:
/tmp/vmware-config1/vmnet-only/userif.c:630: error: ‘const struct sk_buff’ has no member named ‘h’
/tmp/vmware-config1/vmnet-only/userif.c:630: error: ‘const struct sk_buff’ has no member named ‘nh’
/tmp/vmware-config1/vmnet-only/userif.c:636: error: ‘const struct sk_buff’ has no member named ‘h’
make[2]: *** [/tmp/vmware-config1/vmnet-only/userif.o] Error 1
make[1]: *** [_module_/tmp/vmware-config1/vmnet-only] Error 2
make[1]: Leaving directory `/usr/src/linux-2.6.22.5-31'
make: *** [vmnet.ko] Error 2
make: Leaving directory `/tmp/vmware-config1/vmnet-only'
Unable to build the vmnet module.

Interesting, because in /usr/src/linux/include/linux/skbuff.h is sk_buff defined h as head, so you need to substitute "h" to "head" and "nh" to "network_header" :).

But the story goes on, this error happens in userif.c in you can go on bridge.c ...

By the way the working directory is /usr/lib/vmware/, the interesting archive is: /usr/lib/vmware/modules/source/vmnet.tar . This one you extract with "tar xf vmnet.tar", a directory vmnet-only is created, within the broken files (broken == using wrong skh definition). After the editing of the files (userif.c, bridge.c ...) pack it back with "tar cvf vmnet.tar vmnet-only".


Ok here is a patch which makes the VMware build (but this one has a lot of Warnings), I#m not sure if it hurts stability, so you're on you own.

diff -urN vmnet-only/bridge.c /usr/lib/vmware/modules/source/vmnet-only/bridge.c
--- vmnet-only/bridge.c 2007-04-13 05:24:10.000000000 +0200
+++ /usr/lib/vmware/modules/source/vmnet-only/bridge.c  2007-12-07 23:55:38.000000000 +0100
@@ -1083,12 +1083,12 @@
VNetBridgeComputeHeaderPos(struct sk_buff *skb) // IN: buffer to examine
{
   /* Maybe some kernel gets it right... */
-   if (skb->h.raw != skb->nh.raw) {
+   if (skb->head != skb->network_header) {
      return;
   }
   switch (be16_to_cpu(skb->protocol)) {
      case ETH_P_IP:
-         skb->h.raw = skb->nh.raw + (skb->nh.raw[0] & 0x0F) * 4;
+         *(skb->head) = skb->network_header + (skb->network_header & 0x0F) * 4;
        return;
      default:
         LOG(3, (KERN_DEBUG "Unknown EII protocol %04X: csum at %d\n",
@@ -1370,7 +1370,7 @@
#  endif

   if (bridge->smac) {
-      if (VNetCallSMACFunc(bridge->smac, &skb, skb->mac.raw,
+      if (VNetCallSMACFunc(bridge->smac, &skb, skb->mac_header,
                           SMAC_CheckPacketFromHost) !=
          PacketStatusForwardPacket) {
         LOG(4, (KERN_NOTICE "bridge-%s: packet dropped .\n",
@@ -1392,7 +1392,7 @@
#endif
#endif
  
-   skb_push(skb, skb->data - skb->mac.raw);
+   skb_push(skb, skb->data - skb->mac_header);
   LOG(3, (KERN_DEBUG "bridge-%s: receive %d\n",
          bridge->name, (int) skb->len));
   if (VNetBridgeIsGSO(skb)) {
diff -urN vmnet-only/userif.c /usr/lib/vmware/modules/source/vmnet-only/userif.c
--- vmnet-only/userif.c 2007-04-13 05:24:10.000000000 +0200
+++ /usr/lib/vmware/modules/source/vmnet-only/userif.c  2007-12-07 23:49:33.000000000 +0100
@@ -627,13 +627,13 @@
    */
   if (skb->pkt_type == PACKET_OUTGOING &&     /* Packet must be outgoing */
       skb->ip_summed == VM_CHECKSUM_PARTIAL &&        /* Without checksum */
-       skb->h.raw != skb->nh.raw &&            /* We must know where header is */
+       (sk_buff_data_t)(skb->head) != (sk_buff_data_t)(skb->network_header) &&         /* We must know where header is */
       skb->len == count) {                    /* No truncation may occur */
      size_t skl;
      int csum;
      u_int16_t csum16;
     
-      skl = skb->h.raw - skb->data;
+      skl = skb->head - skb->data;
      if (VNetCopyDatagram(skb, buf, skl)) {
        return -EFAULT;
      }
diff -urN vmnet-only/vnetInt.h /usr/lib/vmware/modules/source/vmnet-only/vnetInt.h
--- vmnet-only/vnetInt.h        2007-04-13 05:24:10.000000000 +0200
+++ /usr/lib/vmware/modules/source/vmnet-only/vnetInt.h 2007-12-07 23:40:48.000000000 +0100
@@ -25,8 +25,8 @@
#define DEV_QUEUE_XMIT(skb, dev, pri)  (                 \
    (skb)->dev = (dev),                                   \
    (skb)->priority = (pri),                              \
-    (skb)->mac.raw = (skb)->data,                         \
-    (skb)->nh.raw = (skb)->data + sizeof (struct ethhdr), \
+    (skb)->mac_header = (skb)->data,                         \
+    (skb)->network_header = (skb)->data + sizeof (struct ethhdr), \
    dev_queue_xmit(skb)                                   \
  )
#ifdef KERNEL_2_3_15

If you have better solution, let me know. I'm going to make it a better patch, which should fix some nasty warnings as

 CC [M]  /tmp/vmware-config13/vmnet-only/netif.o
 CC [M]  /tmp/vmware-config13/vmnet-only/bridge.o
/tmp/vmware-config13/vmnet-only/bridge.c: In function ‘VNetBridgeReceiveFromVNet’:
/tmp/vmware-config13/vmnet-only/bridge.c:568: warning: assignment makes integer from pointer without a cast
/tmp/vmware-config13/vmnet-only/bridge.c:568: warning: assignment makes integer from pointer without a cast
/tmp/vmware-config13/vmnet-only/bridge.c: In function ‘VNetBridgeComputeHeaderPos’:
/tmp/vmware-config13/vmnet-only/bridge.c:1086: warning: comparison between pointer and integer
/tmp/vmware-config13/vmnet-only/bridge.c: In function ‘VNetBridgeReceiveFromDev’:
/tmp/vmware-config13/vmnet-only/bridge.c:1374: warning: passing argument 3 of ‘VNetCallSMACFunc’ makes pointer from integer without a cast
/tmp/vmware-config13/vmnet-only/bridge.c:1395: warning: passing argument 2 of ‘skb_push’ makes integer from pointer without a cast

That's all, hopefully VMware tests it software the next time :).

sysbench - create high system load

SysBench- the system benchmark is the utility for creating high load on a machine.

So for example with this parameters:
sysbench --max-time=86400 --num-threads=4096 --max-requests=1000000 --thread-stack-size=512 --init-rng=on --validate=on --test=fileio --file-total-size=1024M --file-test-mode=rndwr run you can get a load about 4000, very impressive. So if you ever searched some tool for creating a lot of stress, this one your friend.
See this:
top - 16:26:35 up 1 day, 19 min, 3 users, load average: 7361.45, 7355.47, 735

BTW, the machine was a single processor Intel P4 3.6 GHz with 3GB DDR ECC RAM and Maxtor IDE drive.

(If you ever wanted to know, what the load of a linux system stands for, this link explains it).

LinuxTag 2007 OpenSUSE auf der PS3

Hey,
does anybody has special wishes to which I should speak about on the LinuxTag? Well the topic is OpenSUSE on PS3 in general, but i would also like to be more precise on the parallel computing side. So If someone wants to know more about the SPU-FS from the Kernel-side then I would shorten the other items of the agenda.
But here is the current (07.05.2007) planning (in German, only):

Gliederung für den Vortrag OpenSUSE auf der PS3:

• Was ist die Playstation3

  • Hardware der PS3

  • Cell Prozessor

    • Einordnung in die IBM Produktpalette

    • Aufbau des Cell µP

    • Vorteile, Nachteile, Parallelisierung

• Anpassungen des Betriebsystems

  • yaboot, Kernel, Userland Tools

  • Kboot (Linux als Bootloader)

  • Möglichkeiten/Grenzen des Systems

    • Graka (Petition), Framebuffer, RAM,

      Vergleich der Einsatzbereiche

• Demonstration:

  - LiveSystem, evt. mit BeispielProgramm, zeigen der SPU's und der generellen Funktion

Still doing work on HAMSTA

Hey,
I'm still working on the HAMSTA (the HArdware Maintenace and Shared Test Automation) project, and so i will ask you, if you have an hamster and could send me an image i can use for the front-page of the project. I don't want to use one from google, you know the copyright issues. So if you have a hamster and you want it online, then that is the right place and the right time.

If you had a look at the page then you saw what I've meant. MediaWiki rocks but without some nice image it's seems really worthless :( .

PK

Initial Post

Hey,
just started a new blog, so that's it :)

PK