sk98lin.txt

linux 内核源代码

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Connection Type (SK-98xx V2.0 copper adapters only)
---------------
Parameter:    ConType
Values:       Auto, 100FD, 100HD, 10FD, 10HD
Default:      Auto

The parameter 'ConType' is a combination of all five per-port parameters
within one single parameter. This simplifies the configuration of both ports
of an adapter card! The different values of this variable reflect the most 
meaningful combinations of port parameters.

The following table shows the values of 'ConType' and the corresponding
combinations of the per-port parameters:

    ConType   |  DupCap   AutoNeg   FlowCtrl   Role             Speed
    ----------+------------------------------------------------------
    Auto      |  Both     On        SymOrRem   Auto             Auto
    100FD     |  Full     Off       None       Auto (ignored)   100
    100HD     |  Half     Off       None       Auto (ignored)   100
    10FD      |  Full     Off       None       Auto (ignored)   10
    10HD      |  Half     Off       None       Auto (ignored)   10

Stating any other port parameter together with this 'ConType' variable
will result in a merged configuration of those settings. This due to 
the fact, that the per-port parameters (e.g. Speed_? ) have a higher
priority than the combined variable 'ConType'.

NOTE: This parameter is always used on both ports of the adapter card.

Interrupt Moderation
--------------------
Parameter:    Moderation
Values:       None, Static, Dynamic
Default:      None

Interrupt moderation is employed to limit the maximum number of interrupts
the driver has to serve. That is, one or more interrupts (which indicate any
transmit or receive packet to be processed) are queued until the driver 
processes them. When queued interrupts are to be served, is determined by the
'IntsPerSec' parameter, which is explained later below.

Possible modes:

   -- None - No interrupt moderation is applied on the adapter card. 
      Therefore, each transmit or receive interrupt is served immediately
      as soon as it appears on the interrupt line of the adapter card.

   -- Static - Interrupt moderation is applied on the adapter card. 
      All transmit and receive interrupts are queued until a complete
      moderation interval ends. If such a moderation interval ends, all
      queued interrupts are processed in one big bunch without any delay.
      The term 'static' reflects the fact, that interrupt moderation is
      always enabled, regardless how much network load is currently 
      passing via a particular interface. In addition, the duration of
      the moderation interval has a fixed length that never changes while
      the driver is operational.

   -- Dynamic - Interrupt moderation might be applied on the adapter card,
      depending on the load of the system. If the driver detects that the
      system load is too high, the driver tries to shield the system against 
      too much network load by enabling interrupt moderation. If - at a later
      time - the CPU utilization decreases again (or if the network load is 
      negligible) the interrupt moderation will automatically be disabled.

Interrupt moderation should be used when the driver has to handle one or more
interfaces with a high network load, which - as a consequence - leads also to a
high CPU utilization. When moderation is applied in such high network load 
situations, CPU load might be reduced by 20-30%.

NOTE: The drawback of using interrupt moderation is an increase of the round-
trip-time (RTT), due to the queueing and serving of interrupts at dedicated
moderation times.

Interrupts per second
---------------------
Parameter:    IntsPerSec
Values:       30...40000 (interrupts per second)
Default:      2000

This parameter is only used if either static or dynamic interrupt moderation
is used on a network adapter card. Using this parameter if no moderation is
applied will lead to no action performed.

This parameter determines the length of any interrupt moderation interval. 
Assuming that static interrupt moderation is to be used, an 'IntsPerSec' 
parameter value of 2000 will lead to an interrupt moderation interval of
500 microseconds. 

NOTE: The duration of the moderation interval is to be chosen with care.
At first glance, selecting a very long duration (e.g. only 100 interrupts per 
second) seems to be meaningful, but the increase of packet-processing delay 
is tremendous. On the other hand, selecting a very short moderation time might
compensate the use of any moderation being applied.


Preferred Port
--------------
Parameter:    PrefPort
Values:       A, B
Default:      A

This is used to force the preferred port to A or B (on dual-port network 
adapters). The preferred port is the one that is used if both are detected
as fully functional.

RLMT Mode (Redundant Link Management Technology)
------------------------------------------------
Parameter:    RlmtMode
Values:       CheckLinkState,CheckLocalPort, CheckSeg, DualNet
Default:      CheckLinkState

RLMT monitors the status of the port. If the link of the active port 
fails, RLMT switches immediately to the standby link. The virtual link is 
maintained as long as at least one 'physical' link is up. 

Possible modes:

   -- CheckLinkState - Check link state only: RLMT uses the link state
      reported by the adapter hardware for each individual port to 
      determine whether a port can be used for all network traffic or 
      not.

   -- CheckLocalPort - In this mode, RLMT monitors the network path 
      between the two ports of an adapter by regularly exchanging packets
      between them. This mode requires a network configuration in which 
      the two ports are able to "see" each other (i.e. there must not be 
      any router between the ports).

   -- CheckSeg - Check local port and segmentation: This mode supports the
      same functions as the CheckLocalPort mode and additionally checks 
      network segmentation between the ports. Therefore, this mode is only
      to be used if Gigabit Ethernet switches are installed on the network
      that have been configured to use the Spanning Tree protocol. 

   -- DualNet - In this mode, ports A and B are used as separate devices. 
      If you have a dual port adapter, port A will be configured as eth0 
      and port B as eth1. Both ports can be used independently with 
      distinct IP addresses. The preferred port setting is not used. 
      RLMT is turned off.
   
NOTE: RLMT modes CLP and CLPSS are designed to operate in configurations 
      where a network path between the ports on one adapter exists. 
      Moreover, they are not designed to work where adapters are connected
      back-to-back.
***


5  Large Frame Support
======================

The driver supports large frames (also called jumbo frames). Using large 
frames can result in an improved throughput if transferring large amounts 
of data.
To enable large frames, set the MTU (maximum transfer unit) of the 
interface to the desired value (up to 9000), execute the following 
command:
      ifconfig eth0 mtu 9000
This will only work if you have two adapters connected back-to-back
or if you use a switch that supports large frames. When using a switch, 
it should be configured to allow large frames and auto-negotiation should  
be set to OFF. The setting must be configured on all adapters that can be 
reached by the large frames. If one adapter is not set to receive large 
frames, it will simply drop them.

You can switch back to the standard ethernet frame size by executing the 
following command:
      ifconfig eth0 mtu 1500

To permanently configure this setting, add a script with the 'ifconfig' 
line to the system startup sequence (named something like "S99sk98lin" 
in /etc/rc.d/rc2.d).
***


6  VLAN and Link Aggregation Support (IEEE 802.1, 802.1q, 802.3ad)
==================================================================

The Marvell Yukon/SysKonnect Linux drivers are able to support VLAN and 
Link Aggregation according to IEEE standards 802.1, 802.1q, and 802.3ad. 
These features are only available after installation of open source 
modules available on the Internet:
For VLAN go to: http://www.candelatech.com/~greear/vlan.html
For Link Aggregation go to: http://www.st.rim.or.jp/~yumo

NOTE: SysKonnect GmbH does not offer any support for these open source 
      modules and does not take the responsibility for any kind of 
      failures or problems arising in connection with these modules.

NOTE: Configuring Link Aggregation on a SysKonnect dual link adapter may 
      cause problems when unloading the driver.


7  Troubleshooting
==================

If any problems occur during the installation process, check the 
following list:


Problem:  The SK-98xx adapter cannot be found by the driver.
Solution: In /proc/pci search for the following entry:
             'Ethernet controller: SysKonnect SK-98xx ...'
          If this entry exists, the SK-98xx or SK-98xx V2.0 adapter has 
          been found by the system and should be operational.
          If this entry does not exist or if the file '/proc/pci' is not 
          found, there may be a hardware problem or the PCI support may 
          not be enabled in your kernel.
          The adapter can be checked using the diagnostics program which 
          is available on the SysKonnect web site:
          www.syskonnect.com
          
          Some COMPAQ machines have problems dealing with PCI under Linux.
          This problem is described in the 'PCI howto' document
          (included in some distributions or available from the
          web, e.g. at 'www.linux.org'). 


Problem:  Programs such as 'ifconfig' or 'route' cannot be found or the 
          error message 'Operation not permitted' is displayed.
Reason:   You are not logged in as user 'root'.
Solution: Logout and login as 'root' or change to 'root' via 'su'.


Problem:  Upon use of the command 'ping <address>' the message
          "ping: sendto: Network is unreachable" is displayed.
Reason:   Your route is not set correctly.
Solution: If you are using RedHat, you probably forgot to set up the 
          route in the 'network configuration'.
          Check the existing routes with the 'route' command and check 
          if an entry for 'eth0' exists, and if so, if it is set correctly.


Problem:  The driver can be started, the adapter is connected to the 
          network, but you cannot receive or transmit any packets; 
          e.g. 'ping' does not work.
Reason:   There is an incorrect route in your routing table.
Solution: Check the routing table with the command 'route' and read the 
          manual help pages dealing with routes (enter 'man route').

NOTE: Although the 2.2.x kernel versions generate the routing entry 
      automatically, problems of this kind may occur here as well. We've 
      come across a situation in which the driver started correctly at 
      system start, but after the driver has been removed and reloaded,
      the route of the adapter's network pointed to the 'dummy0'device 
      and had to be corrected manually.


Problem:  Your computer should act as a router between multiple 
          IP subnetworks (using multiple adapters), but computers in 
          other subnetworks cannot be reached.
Reason:   Either the router's kernel is not configured for IP forwarding 
          or the routing table and gateway configuration of at least one 
          computer is not working.

Problem:  Upon driver start, the following error message is displayed:
          "eth0: -- ERROR --
          Class: internal Software error
          Nr:    0xcc
          Msg:   SkGeInitPort() cannot init running ports"
Reason:   You are using a driver compiled for single processor machines 
          on a multiprocessor machine with SMP (Symmetric MultiProcessor) 
          kernel.
Solution: Configure your kernel appropriately and recompile the kernel or
          the modules.



If your problem is not listed here, please contact SysKonnect's technical
support for help ([e-mail]).
When contacting our technical support, please ensure that the following 
information is available:
- System Manufacturer and HW Informations (CPU, Memory... )
- PCI-Boards in your system
- Distribution
- Kernel version
- Driver version
***



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