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According to NCSI spec (DSP0222), the NCSI enabled interface can
connected to multiple packages simultaneously, up to 8 packages.
Each package includes multiple channels, up to 32 channels. At
one moment, one channel is enabled to provide service to the NCSI
enabled interface. Besides, each channel comprises capabilities,
modes, filters, version and statistics etc. All of them are
resources to NCSI protocol stack.
At the meanwhile, the NCSI device seen from NIC driver is
represented by "struct ncsi_dev", which is expected to populated
and started by NIC driver before the NIC can work. All possible
NCSI packages and NCSI channels connected to the NCSI interface
are tracked from the NCSI device. Also, the NCSI device recognizes
active channel that is currently providing service to NCSI enabled
interface. Also, the NCSI requests (pairs of command and response)
are embedded in NCSI device.
This introduces the data structs to represents the NCSI resources
mentioned as above. Also, functions used by NCSI stack internally
are implemented. Besides, this introduces kernel config option
CONFIG_NET_NCSI to enable NCSI stack.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
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