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3COM PCI TOKEN LINK VELOCITY XL TOKEN RING CARDS README
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3COM PCI TOKEN LINK VELOCITY XL TOKEN RING CARDS README
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Release 0.9.0 - Release
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Release 0.9.0 - Release
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Jul 17th 2000 Mike Phillips
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Jul 17th 2000 Mike Phillips
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1.2.0 - Final
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1.2.0 - Final
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Feb 17th 2002 Mike Phillips
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Feb 17th 2002 Mike Phillips
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Updated for submission to the 2.4.x kernel.
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Updated for submission to the 2.4.x kernel.
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Thanks:
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Thanks:
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Terry Murphy from 3Com for tech docs and support,
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Terry Murphy from 3Com for tech docs and support,
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Adam D. Ligas for testing the driver.
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Adam D. Ligas for testing the driver.
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Note:
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Note:
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This driver will NOT work with the 3C339 Token Ring cards, you need
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This driver will NOT work with the 3C339 Token Ring cards, you need
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to use the tms380 driver instead.
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to use the tms380 driver instead.
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Options:
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Options:
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The driver accepts three options: ringspeed, pkt_buf_sz and message_level.
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The driver accepts three options: ringspeed, pkt_buf_sz and message_level.
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These options can be specified differently for each card found.
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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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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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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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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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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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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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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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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 open at the same speed as
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cannot detect any active monitors on the ring it will open at the same speed as
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its last opening. This can be hazardous if this speed does not match the speed
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its last opening. This can be hazardous if this speed does not match the speed
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you want the ring to operate at.
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you want the ring to operate at.
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pkt_buf_sz: This is this initial receive buffer allocation size. This will
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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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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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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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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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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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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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value will display all soft messages as well. NB This does not turn
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debuging messages on, that must be done by modified the source code.
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debuging messages on, that must be done by modified the source code.
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Variable MTU size:
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Variable MTU size:
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The driver can handle a MTU size upto either 4500 or 18000 depending upon
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The driver can handle a MTU size upto 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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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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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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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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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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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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building routers, gateway's etc, you could start to use a lot of memory
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real fast.
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real fast.
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2/17/02 Mike Phillips
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2/17/02 Mike Phillips
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