Date: Thu, 23 Nov 2000 22:22:29 -0800 (PST) From: Mohan Krishna P <penumetcha@yahoo.com> To: hackers@FreeBSD.ORG Cc: pmk@sasi.com Subject: DMA to user process address space!!! Message-ID: <20001124062229.1645.qmail@web111.yahoomail.com>
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AFAMUG, all user processes are allocated from the
virtual memory. so DMA to that doesn't make sense. but
is there some way, i can let the kernel know i am
DMAing to an address location and hence keep it in
main memory until some x seconds??
here is why we need this. we are writing software for
a multi-port switch. it can be used in both managed
and unmanaged modes. in managed mode, switch is
connected to host through PCI interface. all packets
that can't
be switched are sent to host. with cach such packet,
switch passes information like the source port of the
packet, it's priority level, whether the packet is
tagged or not etc.
in normal operation, driver discards this information
and sends the packet to ether_input(). for testing
purpose, we would like to have user-level process,
which receives packets bypassing the ip stack(it isn't
freeBSD way of doing things, but this is only for
testing) and verifies the information.
if the above thing can't be done, then we will have to
move the user-process functionality to driver.
Thanks,
mohan
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