doc: fix PDF build of bbdev prog guide

  Some machine (like on dpdk.org) may fail to build the prog guide PDF because of the complex table inserted in the bbdev chapter.

Fixes: 3f3f608142cf ("doc: update bbdev guide for 5GNR operations")

Signed-off-by: Nicolas Chautru <nicolas.chautru@intel.com>
---
 doc/guides/prog_guide/bbdev.rst | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)
  

18/07/2019 08:24, Nicolas Chautru:
> -Figure 13.1 above showing the Turbo encoding of CBs using BBDEV
> +Figure :numref:`figure_turbo_tb_encode` above showing the Turbo encoding of CBs using BBDEV
>  interface in TB-mode is also valid for LDPC encode.
[...]
> -Figure 13.2 above showing the Turbo decoding of CBs using BBDEV
> +Figure :numref:`figure_turbo_tb_decode` above showing the Turbo decoding of CBs using BBDEV
>  interface in TB-mode is also valid for LDPC decode.

3 comments above the change of references:

- there are a lot more, please search for the word "section"

- it deserves a separate commit

- the line length should be below 100 chars, better below 80.
The ideal is to break lines logically after a punctuation sign,
or between "subject" and "verb", etc.
Example:
	Figure :numref:`figure_turbo_tb_encode` above
	showing the Turbo encoding of CBs using BBDEV interface in TB-mode
	is also valid for LDPC encode.
  

18/07/2019 08:24, Nicolas Chautru:
> Some machine (like on dpdk.org) may fail to build the prog guide PDF because of the complex table inserted in the bbdev chapter.
> 
> Fixes: 3f3f608142cf ("doc: update bbdev guide for 5GNR operations")
> 
> Signed-off-by: Nicolas Chautru <nicolas.chautru@intel.com>

Thanks for the quick reaction.
If you agree, I can apply this patch without the changes of figure refs.

About the tables, there are simpler syntax in RsT:
http://docutils.sourceforge.net/docs/user/rst/quickref.html#tables
You can also consider the definition lists:
http://docutils.sourceforge.net/docs/user/rst/quickref.html#definition-lists
  

From: Thomas Monjalon [mailto:thomas@monjalon.net] 
>3 comments above the change of references:
>
>- there are a lot more, please search for the word "section"

All the ones I could see are similar to "as per 3GPP TS 38.212 section 5.2.2" which is does not refer to a section within DPDK documentation but to external 3GPP specs documents. 

>- it deserves a separate commit

OK. And you want such a commit now for 19.09 or later on?

>- the line length should be below 100 chars, better below 80.
>The ideal is to break lines logically after a punctuation sign, or between "subject" and "verb", etc.
>Example:
>	Figure :numref:`figure_turbo_tb_encode` above
>	showing the Turbo encoding of CBs using BBDEV interface in TB-mode
>	is also valid for LDPC encode.

All lines are less than 100 chars, but a few places are >80 chars. Let me know if you want this changed for 19.09 or later.
  

From: Thomas Monjalon [mailto:thomas@monjalon.net] 
>18/07/2019 08:24, Nicolas Chautru:
>> Some machine (like on dpdk.org) may fail to build the prog guide PDF because of the complex table inserted in the bbdev chapter.
>> 
>> Fixes: 3f3f608142cf ("doc: update bbdev guide for 5GNR operations")
>> 
>> Signed-off-by: Nicolas Chautru <nicolas.chautru@intel.com>
>
>Thanks for the quick reaction.
>If you agree, I can apply this patch without the changes of figure refs.

No problem, we can fix the other cosmetic changes that you have raised post 19.09. 

>About the tables, there are simpler syntax in RsT:
>http://docutils.sourceforge.net/docs/user/rst/quickref.html#tables

To be honest, I cannot see the problem with the current format which is following that structure already. 
What error message do you get on your machine? This is not caught on DPDK CI, is it? 

>You can also consider the definition lists:
>http://docutils.sourceforge.net/docs/user/rst/quickref.html#definition-lists

Clearer has a formal table from my point of view. 

Thanks
  

18/07/2019 16:43, Chautru, Nicolas:
> From: Thomas Monjalon [mailto:thomas@monjalon.net] 
> >3 comments above the change of references:
> >
> >- there are a lot more, please search for the word "section"
> 
> All the ones I could see are similar to "as per 3GPP TS 38.212 section 5.2.2" which is does not refer to a section within DPDK documentation but to external 3GPP specs documents.

You're right! I completely overlooked it.

> >- it deserves a separate commit
> 
> OK. And you want such a commit now for 19.09 or later on?

Given there are only 2 figure refs, it can stay with PDF fix.

> >- the line length should be below 100 chars, better below 80.
> >The ideal is to break lines logically after a punctuation sign, or between "subject" and "verb", etc.
> >Example:
> >	Figure :numref:`figure_turbo_tb_encode` above
> >	showing the Turbo encoding of CBs using BBDEV interface in TB-mode
> >	is also valid for LDPC encode.
> 
> All lines are less than 100 chars, but a few places are >80 chars. Let me know if you want this changed for 19.09 or later.

The rule is to not do cosmetic change :)
I was explaining the line breaking for the lines you were changing
while fixing figure ref.

I think I will apply this patch and adjust the line breaking if needed.
Is it OK?
  

18/07/2019 16:51, Chautru, Nicolas:
> From: Thomas Monjalon [mailto:thomas@monjalon.net] 
> >About the tables, there are simpler syntax in RsT:
> >http://docutils.sourceforge.net/docs/user/rst/quickref.html#tables
> 
> To be honest, I cannot see the problem with the current format which is following that structure already. 

You are using the grid table syntax.
I was referring to the simple table syntax as below:

	=====  =====  ======
	   Inputs     Output
	------------  ------
	  A      B    A or B
	=====  =====  ======
	False  False  False
	True   False  True
	False  True   True
	True   True   True
	=====  =====  ======

> What error message do you get on your machine?

That's the difficult thing with PDF build, we do not have
any clear error message. I had to bisect to find the root cause.

> This is not caught on DPDK CI, is it?

No and I cannot reproduce it on my laptop.
I see the failure only on dpdk.org which has a different OS version.

> >You can also consider the definition lists:
> >http://docutils.sourceforge.net/docs/user/rst/quickref.html#definition-lists
> 
> Clearer has a formal table from my point of view.

Yes maybe, it depends on what we want to document.
  

From: Thomas Monjalon [mailto:thomas@monjalon.net] 
>18/07/2019 16:43, Chautru, Nicolas:
>> From: Thomas Monjalon [mailto:thomas@monjalon.net]
>> >3 comments above the change of references:
>> >
>> >- there are a lot more, please search for the word "section"
>> 
>> All the ones I could see are similar to "as per 3GPP TS 38.212 section 5.2.2" which is does not refer to a section within DPDK documentation but to external 3GPP specs documents.
>
>You're right! I completely overlooked it.
>
>> >- it deserves a separate commit
>> 
>> OK. And you want such a commit now for 19.09 or later on?
>
>Given there are only 2 figure refs, it can stay with PDF fix.
>
>> >- the line length should be below 100 chars, better below 80.
>> >The ideal is to break lines logically after a punctuation sign, or between "subject" and "verb", etc.
>> >Example:
>> >	Figure :numref:`figure_turbo_tb_encode` above
>> >	showing the Turbo encoding of CBs using BBDEV interface in TB-mode
>> >	is also valid for LDPC encode.
>> 
>> All lines are less than 100 chars, but a few places are >80 chars. Let me know if you want this changed for 19.09 or later.
>
>The rule is to not do cosmetic change :) I was explaining the line breaking for the lines you were changing while fixing figure ref.
>
>I think I will apply this patch and adjust the line breaking if needed.
>Is it OK?
>

Ok with me. Thanks Thomas.
  

18/07/2019 08:24, Nicolas Chautru:
> Some machine (like on dpdk.org) may fail to build the prog guide PDF because of the complex table inserted in the bbdev chapter.
> 
> Fixes: 3f3f608142cf ("doc: update bbdev guide for 5GNR operations")
> 
> Signed-off-by: Nicolas Chautru <nicolas.chautru@intel.com>
> ---
> --- a/doc/guides/prog_guide/bbdev.rst
> +++ b/doc/guides/prog_guide/bbdev.rst
> -+----------------+------------+-------------------------------------------------------+
> -|                |c           |number of CBs in the TB or partial TB                  |
> -+----------------+------------+-------------------------------------------------------+
> -|                |r           |index of the first CB in the inbound mbuf data         |
> -+----------------+------------+-------------------------------------------------------+
> -+                +c_ab        +number of CBs that use Ea before switching to Eb       |
> -+----------------+------------+-------------------------------------------------------+
> ++----------------+--------------------------------------------------------------------+
> +|c               |number of CBs in the TB or partial TB                               |
> ++----------------+--------------------------------------------------------------------+
> +|r               |index of the first CB in the inbound mbuf data                      |
> ++----------------+--------------------------------------------------------------------+
> ++c_ab            +number of CBs that use Ea before switching to Eb                    |
> ++----------------+--------------------------------------------------------------------+

Actually the problem is still here: the table line is "+" instead of "|".
I'll fix it, keeping the original format.