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    DateThu, 26 Apr 2007 13:02:04 +0900
    FromKeiichi KII <>
    SubjectRe: [RFC][PATCH -mm take4 2/6] support multiple logging
    >>>> Well..  before you can finish this work we need to decide upon what the
    >>>> interface to userspace will be.
    >>>>
    >>>> - The miscdev isn't appropriate
    >>>>
    >>> Why isn't miscdev appropriate? 
    >>> We just shouldn't use miscdev for networking conventionally?
    >>>
    >> Yes it's rather odd, especially for networking.
    >>
    >> What does the miscdev _do_ anyway?  Is it purely a target for the ioctls?
    
    Yes, I purely use miscdev for the ioctls.
    
    I want to use sysfs and ioctl to implement the dynamic configurabillity.
    The sysfs shows/changes netconsole configurations(IP address, port and so on).
    A userland application using the ioctl adds/removes netconsole port.
    
    I thought that the dynamic configurability could be realized without a 
    userland application. in the kernel only.
    (e.g. only sysfs, no userland application)
    But I think we need the function to automatically resolve the destination 
    MAC address from IP address because of the resolving cost and 
    I should implement a userland application, not netconsole kernel module.
    The netconsle will become more useful by implementing the above function.
    
    > Some other speculations:
    > 1. Would it be possible to add ioctl's to /dev/console? This would be more in
    >     keeping with older Unix style model.
    > 
    > 2. Using sysfs makes sense if there is a device object that exists to
    >    add the sysfs attributes to.
    > 
    > 3. Procfs is handy for summary type tables.
    > 
    > 4. Netlink does feel like overkill for this. Although newer generic netlink
    >    makes it easier.
    
    If I use sysfs, Is it proper location that adds each attributes of netconsole 
    port in "/sys/class/misc/netconsole/port[0-9]*", or another locations in /sys/?
    
    Stephen Hemminger said "The configuration of netconsole's looks like the 
    configuration of routes".
    I think so too.
    So I think ioctl commands for adding/removing port and the following userland 
    application like route(8) command by using the ioctl.
    
    e.g.
    1. add port
    # netconfig add 192.168.0.10 6666
    2. remove port
    # netconfig remove 1
    
    3. show port info
    # netconfig
    id status  Source IP   Source Port Destination IP Destination Port Destination MAC
    1  enable  192.168.0.1 6665        192.168.0.10   6666             00:11:22:33:44:55
    2  disable 192.168.0.1 6665        192.168.0.20   6666             00:11:22:33:44:66
    route(8) command uses ioctl for Netlink.
    But, I'm going to implement ioctl's to /dev/console because of the above comments.
    
    Thank you for your comments.
    Any comments very welcome.
    -- 
    Keiichi KII
    NEC Corporation OSS Promotion Center
    E-mail: k-keiichi@bx.jp.nec.com
    
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