Re: [PATCH] i40iw: Set 128B as the only supported RQ WQE size

[Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

[-- Attachment #1: Type: text/plain, Size: 4844 bytes --]

On Wed, Dec 21, 2016 at 12:04:55AM +0000, Tung, Chien Tin wrote:
>
>
> > -----Original Message-----
> > From: Leon Romanovsky [mailto:leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org]
> > Sent: Tuesday, December 20, 2016 2:03 PM
> > To: Tung, Chien Tin <chien.tin.tung-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> > Cc: Orosco, Henry <henry.orosco-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>; dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org; linux-
> > rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; e1000-rdma-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> > Subject: Re: [PATCH] i40iw: Set 128B as the only supported RQ WQE size
> >
> > On Tue, Dec 20, 2016 at 02:46:30PM +0000, Tung, Chien Tin wrote:
> > >
> > >
> > > > -----Original Message-----
> > > > From: Leon Romanovsky [mailto:leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org]
> > > > Sent: Tuesday, December 20, 2016 7:42 AM
> > > > To: Tung, Chien Tin <chien.tin.tung-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> > > > Cc: Orosco, Henry <henry.orosco-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>; dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org;
> > > > linux- rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; e1000-rdma-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> > > > Subject: Re: [PATCH] i40iw: Set 128B as the only supported RQ WQE
> > > > size
> > > >
> > > > On Tue, Dec 20, 2016 at 12:44:04PM +0000, Tung, Chien Tin wrote:
> > > > >
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org [mailto:linux-rdma-
> > > > > > owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org] On Behalf Of Leon Romanovsky
> > > > > > Sent: Tuesday, December 20, 2016 5:24 AM
> > > > > > To: Orosco, Henry <henry.orosco-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> > > > > > Cc: dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org; linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; e1000-
> > > > > > rdma-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org; Tung, Chien Tin
> > > > > > <chien.tin.tung-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> > > > > > Subject: Re: [PATCH] i40iw: Set 128B as the only supported RQ
> > > > > > WQE size
> > > > > >
> > > > > > > diff --git a/drivers/infiniband/hw/i40iw/i40iw_ucontext.h
> > > > > > > b/drivers/infiniband/hw/i40iw/i40iw_ucontext.h
> > > > > > > index 12acd68..57d3f1d 100644
> > > > > > > --- a/drivers/infiniband/hw/i40iw/i40iw_ucontext.h
> > > > > > > +++ b/drivers/infiniband/hw/i40iw/i40iw_ucontext.h
> > > > > > > @@ -39,8 +39,8 @@
> > > > > > >
> > > > > > >  #include <linux/types.h>
> > > > > > >
> > > > > > > -#define I40IW_ABI_USERSPACE_VER 4
> > > > > > > -#define I40IW_ABI_KERNEL_VER    4
> > > > > > > +#define I40IW_ABI_VER 5
> > > > > > > +
> > > > > >
> > > > > > Why did you remove defines and move to use constants "4" and "5"
> > > > instead?
> > > > > [Chien Tin Tung] This is the ABI version change, did you read the
> > > > > commit
> > > > message?  Two defines were not necessary.
> > > > >
> > > >
> > > > Thank you Chian Tin Tung for your informative answer and yes, I read
> > > > commit message.
> > > >
> > > > If you think that these defines are not needed, so can you please
> > > > remove the code which uses hardcoded "case 4" and "case 5"?
> > > [Chien Tin Tung]  Those are explicit checks against a particular ABI
> > > version and it is clearer to use the numbers rather than some define.
> >
> > Can you please stop to add [..] in front of your response? This Outlook style is
> > annoying and not needed.
> >
> > Regarding you response, you added the same check in two places and from
> > grep/ctags/cscope/lxr perspective it is easier to spot them with a define.
>
> You have yet to provide a good argument for changing the 4 and 5 to defines,
> so I don't know why you are telling me how to find them. Very puzzling.

I'm not telling to you, but asking from you to provide maintainable code
which will be read more than once. Right now, you blindly copy-pasted
hardcoded values in three different places (2 kernel and 1 rdma-core).

Feel free to ask your colleagues (Faisal L. and Shiraz S.) if they
interested in maintainable driver code or they prefer your prone to errors
copy-paste technique.

> I already made my case on this.  Enough said.
>
> Chien
>
> >
> [Chien]
> > >
> > > >
> > > > Or maybe they still needed and should be renamed?
> > > [Chien Tin Tung] They are not needed.  Before we were checking against
> > > one version and one version only.  Now we are making the provider
> > > library and driver backward compatible.  All we need is one define to
> > > specify current ABI version.
> > >
> > > Chien
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]