Re: [Netnice-kernels] NNFS symlinks for VIF process attachment

[Takashi O. <ta...@wi...>]

hi scott,

i got really impressed by the session. it's functioning!!

you may use the page below for the progress report to the public.

	http://www.netnice.org/pukiwiki.php?Linux

"ln" syntax won't be a problem, since users use commands, like netnice,
not the direct operations. also, we'll wrap the syscall soon by an
os-independent library, libnetnice.

anyways. thanks for your help. it looks really great...


-- taka

Scott Brumbaugh wrote:
> 
> 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
> 
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