By Christian Benvenuti
If you have ever questioned how Linux includes out the complex initiatives assigned to it by way of the IP protocols -- or when you simply are looking to find out about sleek networking via real-life examples -- Understanding Linux community Internals is for you.
Like the preferred O'Reilly ebook, Understanding the Linux Kernel, this booklet sincerely explains the underlying thoughts and teaches you the way to stick to the particular C code that implements it. even if a few history within the TCP/IP protocols is beneficial, you could examine very much from this article concerning the protocols themselves and their makes use of. And for those who have already got a base wisdom of C, you should use the book's code walkthroughs to determine precisely what this refined a part of the Linux kernel is doing.
Part of the trouble in realizing networks -- and imposing them -- is that the initiatives are damaged up and played at many various instances by way of diverse items of code. one of many strengths of this e-book is to combine the items and display the relationships among far-flung features and knowledge buildings. Understanding Linux community Internals is either a big-picture dialogue and a no-nonsense advisor to the main points of Linux networking. subject matters include:
- Key issues of networking
- Network interface card (NIC) machine drivers
- System initialization
- Layer 2 (link-layer) initiatives and implementation
- Layer three (IPv4) initiatives and implementation
- Neighbor infrastructure and protocols (ARP)
Author Christian Benvenuti, an working method clothier focusing on networking, explains even more than how Linux code works. He exhibits the needs of significant networking gains and the trade-offs all in favour of deciding upon one answer over one other. a number of flowcharts and different diagrams increase the book's understandability.
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Worldwide variables dev_boot_phase Boolean flag utilized by legacy code to implement the execution of net_dev_init earlier than NIC gadget drivers sign up themselves. irq_desc Pointer to the vector of IRQ descriptors. facts constitution 104 | bankruptcy five: community equipment Initialization this can be the name of the publication, eMatter version Copyright © 2008 O’Reilly & affiliates, Inc. All rights reserved. desk 5-1. features, macros, variables, and information buildings concerning approach initialization identify Description struct irq_action each one IRQ line is outlined via an example of this constitution. between different fields, it encompasses a callback functionality. net_device Describes a community gadget. records and Directories Featured during this bankruptcy determine 5-6 lists the records and directories noted during this bankruptcy. Root (usually /usr/src/linux) drivers block loop. c web 3c59x. c sis900. c internet init major. c center dev. c comprise linux moduleparam. h determine 5-6. documents and directories featured during this bankruptcy documents and Directories Featured during this bankruptcy | this can be the identify of the publication, eMatter version Copyright © 2008 O’Reilly & affiliates, Inc. All rights reserved. one hundred and five CHAPTER 6 bankruptcy 6 The PCI Layer and community Interface playing cards Given the recognition of the PCI bus, at the x86 in addition to different architectures, we'll spend a couple of pages on it so you might know the way PCI units are controlled through the kernel, with distinct emphasis on community units. This bankruptcy might help you discover a context for the code approximately machine registration we'll see in bankruptcy eight. additionally, you will research a piece approximately how PCI handles a few nifty kernel positive factors reminiscent of probing and tool administration. For an in-depth dialogue of PCI, equivalent to gadget driving force layout, PCI bus positive factors, and implementation information, check with Linux equipment Drivers and knowing the Linux Kernel, in addition to PCI requisites. The PCI subsystem (also often called the PCI layer) within the kernel offers the entire commonly used capabilities which are utilized in universal via quite a few PCI equipment drivers. This subsystem takes loads of paintings off the shoulders of the programmer for every person equipment, we could drivers be written in a fresh demeanour, and makes it more straightforward for the kernel to assemble and retain information regarding the units, corresponding to accounting details and statistics. during this bankruptcy, we'll see the that means of some key facts buildings utilized by the PCI layer and the way those constructions are initialized by means of one universal NIC equipment driving force. I’ll finish with a couple of phrases at the PCI energy administration and Wake-on-LAN beneficial properties. facts buildings Featured during this bankruptcy listed below are a number of key facts constitution kinds utilized by the PCI layer. there are various others, however the following ones are all we have to recognize for our evaluation during this publication. the 1st one is outlined in include/linux/mod_devicetable. h, and the opposite are outlined in include/linux/pci. h. pci_device_id machine identifier. this isn't a neighborhood identity utilized by Linux, yet an identity outlined hence to the PCI general. The later part “Registering a PCI NIC equipment motive force” indicates the ID’s definition, and the later part “Example of PCI NIC driving force Registration” provides an instance.