Data Sheet

Ethernet Controller I210 —System Manageability
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10.4.3 Blocking of network to MC flow
In some systems the MC may have its own private connection to the network and may use the I210
port only for the OS-to-MC traffic. In this case, the MC to network flow should be blocked while enabling
the OS-to-MC and OS to network flows.
This can be done by clearing the MANC.EN_BMC2NET bit for the relevant port. The MC can control this
functionality using the “Enable Network to MC flow” and “Disable Network to MC flow” NC-SI OEM
commands. This can also be controlled using the Network to MC disable field in the Flash “OS2BMC
Configuration Structure”.
Note: When network to MC flow is blocked and OS-to-MC flow is enabled, all the traffic from the MC
is sent to the OS without any check. The OS traffic filtering is still done using the regular
decision filters.
10.4.4 Statistics
Packets sent from the OS to the MC should be counted by all statistical counters as packets sent by the
OS. If they are sent to both the network and to the MC, then they are counted once.
Packets sent from the MC to the Host are counted as packets received by the Host. If they are sent to
the Host and to the network, then they are counted both as received packets and as packet transmitted
to the network.
In addition, the I210 supports the following statistical counters that measure just the MC to OS and OS-
to-MC traffic:
• O2BGPTC - OS2BMC packets received by MC
• O2BSPC - OS2BMC packets transmitted by OS
• B2OSPC - BMC2OS packets sent by MC
• B2OGPRC - BMC2OS packets received by OS.
The driver can use these statistics to count packets dropped by the I210 during the transfer between
the OS and the MC.
See Section 7.9.5 for details of the statistics hierarchy.
10.4.5 OS-to-MC Enablement
The I210 supports the unified network software model for OS-to-MC traffic, where the OS-to-MC traffic
is shared with the regular traffic. In this model, there is no need for a special configuration of the OS
networking stack or the MC stack, but if the link is down, then the OS-to-MC communication is stopped.
In order to enable OS-to-MC either:
• Enable OS2BMC in the port traffic type field in the Traffic type Parameters Flash word for the
relevant port.
•Send an EnableOS2BMC Flow NC-SI OEM Command.
Note: When OS2BMC is enabled, OS shall avoid sending packets longer than 1.5KB to MC. Such
packets will be dropped.