Then the driver connects an interrupt handler to the interrupt line driven by the Ethernet controller the only interrupt which will be treated is the receive interrupt and launches 2 threads: Over 1,, fellow IT Pros are already on-board, don’t be left out! In this chapter will see the initialization phase, how the controller uses the host memory and the 2 threads launched at the initialization time. TECHGENIX TechGenix reaches millions of IT Professionals every month, and has set the standard for providing free technical content through its growing family of websites, empowering them with the answers and tools that are needed to set up, configure, maintain and enhance their networks. By reading or writing these registers, a driver can obtain information about the type of the board, the interrupt it uses, the mapping of the chip specific registers, …. One buffer has bytes, one descriptor has 16 bytes.
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To reference these buffers to the DEC chip we use a buffer descriptors ring.
Software and Drivers for the Intel® PRO/100 Adapter
Each valid incoming ethernet frame is sent to the protocol stack and the buffer descriptor is given back to the DEC board the host processor reset bit OWN, which means descriptor belongs to Currently, this tool does not support the DEC board. This thread is also event driven. Once the attach function executed, the driver initializes the DEC chip. Finally, we will see what will be done for ChorusOs and Netboot environment.
Concerning the buffers and their descriptors, we have tried to optimize the memory space in term of allocated page.
It means that we will have to re-write some mechanisms of this driver. First draft of this document Netqork releases: The difference between a receive and a transmit buffer descriptor is located in the status and control bits fields. We choose to use only one buffer of bytes per descriptor.
This DEC chip uses the host memory to store the incoming Ethernet frames and the descriptor of these frames. Over 1, fellow IT Pros are already on-board, don’t be left out!
Making legacy Linux networking work in Hyper-V
Because the DEC chip uses the host memory to store the incoming frame and because the DEC configuration registers are mapped into the PCI address space, we must ensure that the data read or written by the host processor are the ones written or read by the DEC device in the host memory and not old data stored in the cache memory.
On Intel, the memory region cache management is available only if the paging unit is enabled. This chapter describes rapidely the PCI interface of this Ethernet controller. We have used this paging mechanism, with 4Kb page.
All the buffers allocated to store the incoming or outcoming frames, buffer descriptor and 211140 the PCI address space of the DEC board are located in a memory space with cache disable.
21140 network in dos
By reading or writing these registers, a driver can obtain information about the type of the board, the interrupt it uses, the mapping of the chip specific registers, …. This allows not to lose too much memory or not to disable cache memory for a page which contains other data than buffer, which could decrease performance. To achieve it, we have chosen 12140 Motorola MCP board.
Each time an Ethernet frame is put in the transmit queue, an event is sent to the transmit thread, which empty the queue by sending each outcoming frame. One buffer has bytes, one descriptor has 16 bytes. DEC Driver 7.
Accton EN All three media types supported. On Intel Netwokr target, we were faced with a problem of memory cache management. List of Ethernet cards using the DEC chip 8.
Here is a non exhaustive list of adapters which support this driver:. TECHGENIX TechGenix reaches millions of IT Professionals every month, and has set the standard for providing free technical content through its growing family of websites, empowering them with the answers and networm that are needed to set up, configure, maintain and enhance their networks.
Software and Drivers for the Intel® PRO/ Adapter
The descriptor structure is defined in the Buffer Descriptor Figure. Therefore, we had to provide a way to manage the cache. Testing the Driver 6. Network Task Structure and Data Flow 3. On Intel target, the chip specific registers can be accessed via 2 methods: