80 lines
3.6 KiB
Plaintext
80 lines
3.6 KiB
Plaintext
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IBM PCI Pit/Pit-Phy/Olympic CHIPSET BASED TOKEN RING CARDS README
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Release 0.2.0 - Release
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June 8th 1999 Peter De Schrijver & Mike Phillips
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Release 0.9.C - Release
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April 18th 2001 Mike Phillips
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Thanks:
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Erik De Cock, Adrian Bridgett and Frank Fiene for their
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patience and testing.
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Donald Champion for the cardbus support
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Kyle Lucke for the dma api changes.
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Jonathon Bitner for hardware support.
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Everybody on linux-tr for their continued support.
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Options:
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The driver accepts four options: ringspeed, pkt_buf_sz,
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message_level and network_monitor.
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These options can be specified differently for each card found.
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ringspeed: Has one of three settings 0 (default), 4 or 16. 0 will
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make the card autosense the ringspeed and join at the appropriate speed,
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this will be the default option for most people. 4 or 16 allow you to
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explicitly force the card to operate at a certain speed. The card will fail
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if you try to insert it at the wrong speed. (Although some hubs will allow
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this so be *very* careful). The main purpose for explicitly setting the ring
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speed is for when the card is first on the ring. In autosense mode, if the card
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cannot detect any active monitors on the ring it will not open, so you must
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re-init the card at the appropriate speed. Unfortunately at present the only
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way of doing this is rmmod and insmod which is a bit tough if it is compiled
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in the kernel.
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pkt_buf_sz: This is this initial receive buffer allocation size. This will
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default to 4096 if no value is entered. You may increase performance of the
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driver by setting this to a value larger than the network packet size, although
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the driver now re-sizes buffers based on MTU settings as well.
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message_level: Controls level of messages created by the driver. Defaults to 0:
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which only displays start-up and critical messages. Presently any non-zero
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value will display all soft messages as well. NB This does not turn
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debugging messages on, that must be done by modified the source code.
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network_monitor: Any non-zero value will provide a quasi network monitoring
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mode. All unexpected MAC frames (beaconing etc.) will be received
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by the driver and the source and destination addresses printed.
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Also an entry will be added in /proc/net called olympic_tr%d, where tr%d
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is the registered device name, i.e tr0, tr1, etc. This displays low
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level information about the configuration of the ring and the adapter.
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This feature has been designed for network administrators to assist in
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the diagnosis of network / ring problems. (This used to OLYMPIC_NETWORK_MONITOR,
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but has now changed to allow each adapter to be configured differently and
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to alleviate the necessity to re-compile olympic to turn the option on).
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Multi-card:
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The driver will detect multiple cards and will work with shared interrupts,
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each card is assigned the next token ring device, i.e. tr0 , tr1, tr2. The
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driver should also happily reside in the system with other drivers. It has
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been tested with ibmtr.c running, and I personally have had one Olicom PCI
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card and two IBM olympic cards (all on the same interrupt), all running
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together.
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Variable MTU size:
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The driver can handle a MTU size up to either 4500 or 18000 depending upon
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ring speed. The driver also changes the size of the receive buffers as part
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of the mtu re-sizing, so if you set mtu = 18000, you will need to be able
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to allocate 16 * (sk_buff with 18000 buffer size) call it 18500 bytes per ring
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position = 296,000 bytes of memory space, plus of course anything
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necessary for the tx sk_buff's. Remember this is per card, so if you are
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building routers, gateway's etc, you could start to use a lot of memory
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real fast.
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6/8/99 Peter De Schrijver and Mike Phillips
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