Date: Mon, 27 Jul 2020 17:36:46 +0530 From: Saima Baig <saimabaig11@gmail.com> To: freebsd-net@freebsd.org Subject: Network driver development Message-ID: <CADmn7ACPCE9Amn1wx8n=oCWun06=mnTxfQMg8R1wFZ-dLsFSvg@mail.gmail.com>
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Hello I'm getting started with driver development in FreeBSD. Im reading the classic 'design and implementation' text by Kirk and Neville et all. As expected I have a bunch of questions and general doubts about things. Here are some of the questions I have: 1. Why are the number of Transmit and Receive descriptors hardware dependent? AFAIK, the driver merely programs the base address of the buffer descriptor ring isn't it? Why would the hardware care if this linked list has 100 elements or 1000? 2. Most examples I find on the internet is for the e1000 adapter, which is a 1Gbps adapter. Things seem to have gotten a lot more complex since the introduction of 10Gbps (and now 40Gbps) adapters and newer hardware techniques like RSS, LRO and TSO. Is there a blog/text that introduces the implementation challenges for these technologies? Lastly, as a meta question, where do questions on freebsd network drivers belong to? This mailing list or the generic drivers mailing list? Or should I post it to net@freebsd.org? waiting to hear from the experts here. Regards, Ms. S
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