Message handler
A message handler is described. The message handler is configured, in response to receiving a data package which is formatted according to a given communications protocol, such as CAN or Ethernet, and which comprises package-directing data and payload data, to generate package having a predetermined data format, for example a layer-2 or layer-3 package, which comprises a header and payload data. The header comprises an address generated in dependence upon the package-directing data and wherein the payload comprises the data package. The package having a predetermined data format may be an IEEE 1722 frame.
1. A hardware-implemented network interface module comprising:
a protocol engine; and
a message handler which is configured, in response to receiving a data package from the protocol engine which is formatted according to a given communications protocol and which comprises package-directing data and payload data, to generate a package having a predetermined data format which comprises a header and payload, wherein the header comprises an address generated in dependence upon the package-directing data and wherein the payload comprises the data package, wherein the package having the predetermined data format is a layer-3 package, and wherein the message handler is configured to copy data from a first field in the package-directing data into a corresponding field in the header.
2. A hardware-implemented network interface module according to claim 1 , wherein the message handler is configured to add predetermined data to a second field in the header.
3. A hardware-implemented network interface module according to claim 1 , wherein the message handler is configured to add calculated data to the header in dependence upon data from the first field and/or from a second field to a second field in the header.
4. A hardware-implemented network interface module according to claim 1 , wherein the message handler is configured, in response to receiving a package having a predetermined data format which comprises a header and payload, to extract a data package which is formatted according to a given communications protocol and which comprises package-directing data and payload data.
5. A hardware-implemented network interface module according to claim 1 , wherein the package having the predetermined data format is an IP packet.
6. A hardware-implemented network interface module according to claim 1 , wherein the given communications protocol is the controller area network flexible data rate protocol.
7. A hardware-implemented network interface according to claim 1 , wherein the given communications protocol is the FlexRay protocol.
8. A hardware-implemented network interface module according to claim 1 , wherein the given communications protocol is the media oriented systems transport protocol.
9. A control unit comprising:
the hardware-implemented network interface module according to claim 1 , the hardware-implemented network interface module being a first hardware-implemented network interface module and the message handler being a first message handler configured to handle data packages formatted according to a first communications protocol;
a second hardware-implemented network interface module comprising a second message handler configured to handle data packages formatted according to a second communications protocol; and
a message forwarder configured to exchange packages having the predetermined data format between the first and second message handlers.
10. A control unit according to claim 9 , wherein the message forwarder is a layer-2 switch and/or a layer 3-router.
11. A control unit according to claim 9 , wherein the first and second communication protocols are different.
12. A control unit according to claim 9 , further comprising:
a third hardware-implemented network interface module comprising a third message handler configured to handle data packages formatted according to a third communications protocol.
13. A control unit according to claim 9 , further comprising:
a central processing unit sub-system; and
wherein the message forwarder is configured to exchange between the central processing unit sub-system and the first and/or second message handlers.
14. A communications system comprising:
at least two sets of buses lines; and
at least one control unit according to claim 9 connected to the buses.
15. A hardware-implemented network interface module comprising:
a protocol engine; and
a message handler configured, in response to receiving a package having a predetermined data format which comprises a header and payload, wherein the payload comprises a data package, to extract the data package which is formatted according to a given communications protocol and which comprises package-directing data and payload data, and to forward the data package to the protocol engine, wherein the package having the predetermined data format is a layer-3 package.
16. A central processing unit sub-system comprising:
a central processing unit;
memory;
a computer program stored in memory or other storage which, when executed by the central processing unit, causes the central processing unit to execute a message handler which is configured, in response to receiving a data package which is formatted according to a given communications protocol and which comprises package-directing data and payload data, to generate a package having a predetermined data format which comprises a header and payload, wherein the header comprises an address generated in dependence upon the package-directing data and wherein the payload comprises the data package, wherein the package having the predetermined data format is a layer-3 package, and wherein the message handler is configured to copy data from a first field in the package-directing data into a corresponding field in the header.