Skb Documentation?

Skb Documentation?

[Nick Krause]

After searching around in the documentation directory, I need no
information on skb data structure and other information relating to
skb
data type. If someone knowns where there is Documentation in the
kernel directory please tell me, otherwise I would be glad to write
up.
Regards Nick

Skb Documentation?

[leo kirotawa]

git grep is your friend. :)
http://www.linuxjournal.com/article/1312


On Thu, Aug 14, 2014 at 1:40 PM, Nick Krause <xerofoify@gmail.com> wrote:

> After searching around in the documentation directory, I need no
> information on skb data structure and other information relating to
> skb
> data type. If someone knowns where there is Documentation in the
> kernel directory please tell me, otherwise I would be glad to write
> up.
> Regards Nick
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>



-- 

----------------------------------------------
Le?nidas S. Barbosa (Kirotawa)
blog: corecode.wordpress.com
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Skb Documentation?

[Valdis.Kletnieks at vt.edu]

On Thu, 14 Aug 2014 12:40:53 -0400, Nick Krause said:
> After searching around in the documentation directory, I need no
> information on skb data structure and other information relating to

Shouldn't you have done that reading *BEFORE* you started submitting
57 different versions of a patch that messed with skb's?

> otherwise I would be glad to write up.

No.  Please, for FSM's sake, *DON'T* write it up.

We prefer our documentation written by somebody who actually understands
the topic under discussion.
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Skb Documentation?

[Jerry Snitselaar]

On Thu Aug 14 14, leo kirotawa wrote:
>    git grep is your friend. :)
>    [1]http://www.linuxjournal.com/article/1312

That and learn to use cscope and/or ctags

Jerry

Skb Documentation?

[Nick Krause]

On Thu, Aug 14, 2014 at 1:42 PM, Jerry Snitselaar <dev@snitselaar.org> wrote:
> On Thu Aug 14 14, leo kirotawa wrote:
>>    git grep is your friend. :)
>>    [1]http://www.linuxjournal.com/article/1312
>
> That and learn to use cscope and/or ctags
>
> Jerry
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

Jerry,
I fixed up my patch and sent it to the kernel newbies list.
If you can't find it I will resend.
Nick

Skb Documentation?

[Jeff Haran]

> -----Original Message-----
> From: kernelnewbies-bounces at kernelnewbies.org [mailto:kernelnewbies-bounces at kernelnewbies.org] On Behalf Of Jerry
> Snitselaar
> Sent: Thursday, August 14, 2014 10:42 AM
> To: leo kirotawa
> Cc: kernelnewbies
> Subject: Re: Skb Documentation?
> 
> On Thu Aug 14 14, leo kirotawa wrote:
> >    git grep is your friend. :)
> >    [1]http://www.linuxjournal.com/article/1312
> 
> That and learn to use cscope and/or ctags
> 
> Jerry

I've found that the best browser for trying to understand kernel code comes from a commercial source, but you should be able to use it for free. You just need to sign up to create an account and when I did it, it was free. Check out https://scan.coverity.com/. The Coverity browser is C language knowledgeable and the Coverity people regularly do analyses of several open source projects, including Linux.

Where it really shines over tools like cscope or ctags is when you are trying to understand how a given field of a structure is used, or any other case where the same function or variable name is used in several different contexts. For example, let's say you are interested in how the kernel uses the struct sk_buff cb field. If you do a search for "cb" in the kernel sources using cscope, you get hits for a myriad of instances of variables and structure fields named "cb" that have nothing to do with the sk_buff cb field. Weeding out all the false positives is quite tedious and time consuming. But the Coverity browser knows the difference between (struct sk_buff *)->cb and all the cbs that represent callback functions in unrelated code. Big time saver.

Jeff Haran

Skb Documentation?

[Nick Krause]

On Thu, Aug 14, 2014 at 2:07 PM, Jeff Haran <Jeff.Haran@citrix.com> wrote:
>> -----Original Message-----
>> From: kernelnewbies-bounces at kernelnewbies.org [mailto:kernelnewbies-bounces at kernelnewbies.org] On Behalf Of Jerry
>> Snitselaar
>> Sent: Thursday, August 14, 2014 10:42 AM
>> To: leo kirotawa
>> Cc: kernelnewbies
>> Subject: Re: Skb Documentation?
>>
>> On Thu Aug 14 14, leo kirotawa wrote:
>> >    git grep is your friend. :)
>> >    [1]http://www.linuxjournal.com/article/1312
>>
>> That and learn to use cscope and/or ctags
>>
>> Jerry
>
> I've found that the best browser for trying to understand kernel code comes from a commercial source, but you should be able to use it for free. You just need to sign up to create an account and when I did it, it was free. Check out https://scan.coverity.com/. The Coverity browser is C language knowledgeable and the Coverity people regularly do analyses of several open source projects, including Linux.
>
> Where it really shines over tools like cscope or ctags is when you are trying to understand how a given field of a structure is used, or any other case where the same function or variable name is used in several different contexts. For example, let's say you are interested in how the kernel uses the struct sk_buff cb field. If you do a search for "cb" in the kernel sources using cscope, you get hits for a myriad of instances of variables and structure fields named "cb" that have nothing to do with the sk_buff cb field. Weeding out all the false positives is quite tedious and time consuming. But the Coverity browser knows the difference between (struct sk_buff *)->cb and all the cbs that represent callback functions in unrelated code. Big time saver.
>
> Jeff Haran
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
I was using lxr for a while but this looks good. Thanks for the
information Jeff.
If you want to send out some patches for me I have two, one is from today that
I just sent and the other one is hard to find due to be not learning
skbs. I will
resend it to you directly if you like.
Nick

Skb Documentation?

[Bjørn Mork]

Nick Krause <xerofoify@gmail.com> writes:

> After searching around in the documentation directory, I need no
> information on skb data structure and other information relating to
> skb
> data type. If someone knowns where there is Documentation in the
> kernel directory please tell me, otherwise I would be glad to write
> up.

Instead of repeating myself: https://lkml.org/lkml/2014/7/23/610


Bj?rn