I think we can simplify this without changing the format of how the IPoIB
mac addr is stored.
assume the IPoIB netdevs have type ARPHRD_INFINIBAND, and iWARP netdevs are
type ARPHRD_ETHERNET.
The CMA would search only the IWARP openib devices and compare the 6 byte
MAC address if the netdev type is ETHERNET, and search only the IB openib
devices matching on the full 20 byte IPoIB mac addr. Doing this removes the
possibility that a 6 byte ethernet mac addr accidentally matches the first 6
bytes of the IPoIB mac addr...
Steve.
----- Original Message -----
From: "Tom Tucker" <[EMAIL PROTECTED]>
To: "Sean Hefty" <[EMAIL PROTECTED]>
Cc: <[email protected]>
Sent: Thursday, October 20, 2005 11:41 PM
Subject: [openib-general] Re: rdma_bind_addr question
On Thu, 2005-10-20 at 13:09 -0700, Sean Hefty wrote:
Tom Tucker wrote:
> BTW -- I think this means that we need an ARPHRD_IWARP type.
It may be that the CMA can simply look in its local device list for an
ib_device
that has a given MAC address.
After pondering this, I think you're correct. There is one issue,
however. Currently, the GID is stored beginning at the fourth byte of
the dev_addr for IBoIB, but the Ethernet MAC address begins at byte 0.
Is it possible to move this 4B quantity to follow the GID? If so, we
could pad the dev_addr for iWARP devices with zeroes and use the exact
same code to search the cma device table. If the device is found, it
already has a type in the ib_device structure to distinguish between IB
and iWARP devices.
If the caller gave us an IP address for a dumb Ethernet device, we would
go looking for it in the cma device list and simply not find it. It
would still fail, just later, and would avoid a new ARPHRD type.
I don't know the detail of how iWarp will work with this. Will iWarp
need a
call similar to ib_translate_addr() to translate an IP address into a MAC
address? Are the MAC addresses stored with the ib_device somehow?
- Sean
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