[Netnice-kernels] NNFS symlinks for VIF process attachment

[Scott B. <sco...@ve...>]

Hi Takashi,

I am moving along in the development and am at a point where much of
the API is in place.  It is not done but it is getting there. At some
point we will need to agree that the API work is complete as it can be
given the missing internals.

I have implemented the symlink operation for attaching a VIF to a
process.  The syntax is different from FreeBSD.  Under FreeBSD a command
like:

  # ln -s /nnfs/network/lo0/vif1

will create a symlink under <pid>/sockets called lo0 that points to
vif1.  According to the man page for ln, this command should create a
symlink called vif1.

Under Linux NNFS this command will return an error because vif1 is not
the name of a network interface.  The command on Linux to attach a vif
to a process is:

  # ln -sf /nnfs/network/lo/vif1 lo

This command says force the creation of the symlink named lo. The -f
switch is needed because a symlink named lo already exists. If you don't
want to use the -f switch you must first remove the symlink before creating
a new one like this:

  # rm lo
  # ln -s /nnfs/netword/lo/vif1 lo

Here is a sample session of the features that are in place and have been
commited to your CVS:

[root@tamarack root]# uname -a
Linux tamarack.inyotech.local 2.6.7-nnice #9 SMP Wed Oct 20 09:12:36 PDT 2004 i686 i686 i386 GNU/Linux
[root@tamarack root]# /sbin/modprobe nnfs
[root@tamarack root]# mount -t nnfs none /nnfs
[root@tamarack root]# ls /nnfs/network/
eth0  lo
[root@tamarack root]# mkdir /nnfs/network/eth0/vif1
[root@tamarack root]# ls -l /nnfs/network/eth0/vif1/
total 0
-rw-r--r--  1 root root 0 Oct 20 11:26 bandwidth
-rw-r--r--  1 root root 0 Oct 20 11:26 drops
-rw-r--r--  1 root root 0 Oct 20 11:26 filter
-rw-r--r--  1 root root 0 Oct 20 11:26 port
-rw-r--r--  1 root root 0 Oct 20 11:26 recv
-rw-r--r--  1 root root 0 Oct 20 11:26 send
-rw-r--r--  1 root root 0 Oct 20 11:26 type
-rw-r--r--  1 root root 0 Oct 20 11:26 weight
[root@tamarack root]# cat /nnfs/network/eth0/vif1/bandwidth
     0
[root@tamarack root]# echo 128K > /nnfs/network/eth0/vif1/bandwidth
[root@tamarack root]# cat /nnfs/network/eth0/vif1/bandwidth
136000
[root@tamarack root]# ps ax | grep sendmail
 1852 ?        S      0:00 sendmail: accepting connections
 1863 ?        S      0:00 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue
 2479 pts/1    S      0:00 grep sendmail
[root@tamarack root]# cd /nnfs/procs/1852/sockets/
[root@tamarack sockets]# ls -l
total 0
drwxr-xr-x  3 root root 0 Oct 20 11:28 3
drwxr-xr-x  3 root root 0 Oct 20 11:28 4
lrwxr-xr-x  1 root root 0 Oct 20 11:28 eth0 -> /nnfs/network/eth0
lrwxr-xr-x  1 root root 0 Oct 20 11:28 lo -> /nnfs/network/lo
[root@tamarack sockets]# ln -sf /nnfs/network/eth0/vif1 eth0
[root@tamarack sockets]# ls -l
total 0
drwxr-xr-x  3 root root 0 Oct 20 11:28 3
drwxr-xr-x  3 root root 0 Oct 20 11:28 4
lrwxr-xr-x  1 root root 0 Oct 20 11:28 eth0 -> /nnfs/network/eth0/vif1
lrwxr-xr-x  1 root root 0 Oct 20 11:28 lo -> /nnfs/network/lo
[root@tamarack sockets]# 


Thanks,


Scott Brumbaugh