configure Intel 82559 Ethernet card for "Early Interrupts"

From: Vaibhave Agarwal (vaibhave_at_cs.utah.edu)
Date: 09/26/04

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    Date: Sun, 26 Sep 2004 03:36:38 -0600 (MDT)
To: freebsd-net@FreeBSD.ORG

    hi all

    I am trying to configure Intel 82559 10/100 Mbps Ethernet card to generate
    "Early Interrupts", so that I can receive interrupts from the driver, long
    before the whole packet is transferred to the host memory.

    I have set the Early Receive Interrupt field in the CSR register of the
    card. But still I am not getting these interrupts.

    The reason I found out was that the card generates interrupt if the
    ethernet header's type/length field is set to 0-1500 value i.e. set
    to length of the packet. But if it is set to Type field ( 0x800 for ip
    packet) then according to the Intel's manual , the interrupt is generated
    only if "the device is configured to generate early interrupts on IP
    frames"

    Do anybody know how can I configure the device to generate early
    interrupts for IP frames OR any other way to get around with this
    problem??

    thanks
    vaibhave
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