Once again, the sample code works on the 2. They can receive multicast packets only by receiving every packet, thus potentially overwhelming the operating system with a huge number of “uninteresting” packets. In other words, packets sent through one of the interfaces should be received by the other, but the receiver of the outgoing packet shouldn’t be recognized as the local host. The regular versions perform checking to ensure that adequate space is available; double-underscore versions leave those tests out. We have just seen that the hardware header contains some information in addition to the destination address, the most important being the communication protocol. Here are possible values for the network numbers.

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The code modifies the source, destination, and checksum in the IP header of each packet without checking whether it actually conveys IP information. Most drivers that deal with real hardware have to be prepared for that hardware to fail to respond occasionally. We’ll start with transmission because it is slightly easier to understand. This header is included by netdevice. But it is not helpful to cover the entire structure at this point; instead, we will explain each field as it is used.

Packet reception, on the other hand, doesn’t need any special interrupt handling. This capability can be used by the system administrator if the interface cannot be probed for. For example, pppstats uses device-specific commands to retrieve information from the ppp interface driver. Normally, Ethernet driver writers need not know about this process — the common Ethernet code takes care of everything. By convention, the end fields are set so that end – start is the amount of available on-board memory.


Watching the interfaces with tcpdump can be a useful way to see how the two interfaces work. Refer to Datasheet for formal definitions of product properties and features. The numbers you choose might be real Internet or intranet numbers, and assigning them to your interfaces will prevent communication with the real hosts. Prices may vary for other package types and shipment quantities, and special promotional arrangements may apply.

The hardware header length, that is, the number of octets that lead the transmitted packet before the IP header, or other protocol information. The networking subsystem has seen many changes over the years as the kernel developers have striven to provide the best performance possible. This peculiar way of setting things up is most useful during system boot; every driver tries to register its own devices, but only devices that exist are linked to the list.

The other field we initialized is inita function pointer.

IntelĀ® IT Gigabit Ethernet Controller Product Specifications

The first, and most important, design decision was that the sample interfaces should remain independent of real hardware, just like most of the sample code used in this book. Drivers for modern hardware normally do not need to implement this method.

Ordering and spec information. This is how snull implements it, as a very short function.

IT GbE controller EEPROM or FLASH which is |Intel Communities

These fields hold the beginning and ending addresses of the shared memory used by the device. If initialization fails, the structure is not linked to the global list of network devices.


Your comments have been sent. This applies to both networking protocols IP versus IPX or other protocols and hardware protocols Ethernet versus token ring, etc. They can receive multicast packets only by receiving every packet, thus potentially overwhelming the operating system with a huge number of “uninteresting” packets. It is important, in particular, that the driver not lose track of any socket buffers that have been entrusted to it by the networking code.

This happens when multicast routing is enabled. Any ioctl command that is not recognized by the protocol layer is passed to the device layer. The structure is at the core of the network subsystem of the Linux kernel, and we now introduce both the main fields of the structure and the functions used to act on it. A couple of functions had different prototypes. The role of a network interface within the system is similar to that of a mounted block device.

Downloads for IntelĀ® 82574IT Gigabit Ethernet Controller

The following function is a 8254it implementation of the function in a full-featured ff driver. This is the optimum case for the kernel, because it doesn’t waste processor time dropping “uninteresting” packets received by the interface.

And there’s also nothing new in the way resources are requested.