possible doing context switch between network and link layers?

[DSD staff]

Hi,

Try to control the NIC output, instead of dropping the packet, I would
like to do context switch on current sending process.  tsleep() seems not
to be a right mechanism for this purpose because it will panic in the kernel
wherever between the network and link layers the tsleep() is put -- e.g.

ether_output()
{
        ...
        if (IF_QFULL)   {
                tsleep(m, PSOCK, "pause NIC", 1);
                if (IF_QFULL)
                        DROP_Q;
        }
        ...
}

Is there other context switch mechanism for this purpose? or
is it impossible to do the context switch at network and link layers?

        -Jin


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