Re: [dpdk-dev] [PATCH v2 1/7] lib/librte_pci: add rte_pci_regs.h

[Jerin Jacob <jerinjacobk@gmail.com>]

On Thu, Jul 16, 2020 at 4:57 PM Thomas Monjalon <thomas@monjalon.net> wrote:
>
> 16/07/2020 12:27, Jerin Jacob:
> > On Thu, Jul 16, 2020 at 3:48 PM Gaëtan Rivet <grive@u256.net> wrote:
> > >
> > > On 16/07/20 12:08 +0200, Gaëtan Rivet wrote:
> > > > Re-CCing dev@dpdk.org as it was removed from the reply.
> > > >
> > > > On 13/07/20 08:13 -0700, Manish Chopra wrote:
> > > > > This is merely copy of latest linux/pci_regs.h in
> > > > > order to avoid dependency of dpdk on user headers.
> > > > >
> > > >
> > > > I guess this dependency is an issue on non-linux systems, when you must
> > > > use those defines in a generic implementation. Can you confirm this is
> > > > the motivation here?
> > > >
> > > > If so, I think it would be clearer to state "in order to avoid
> > > > dependency of DPDK on linux headers".
> > > >
> > >
> > > To add to it, if this is actually the motivation to add this header, I
> > > don't think it is sufficient.
> > >
> > > You can restrict the function definition to the linux part of the
> > > PCI bus driver instead, using stubs for other systems.
> > >
> > > > > Signed-off-by: Manish Chopra <manishc@marvell.com>
> > > > > Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
> > > > > ---
> > > > >  drivers/bus/pci/linux/pci_uio.c     |    2 +-
> > > > >  drivers/bus/pci/linux/pci_vfio.c    |    2 +-
> > > > >  drivers/net/bnx2x/bnx2x.h           |    2 +-
> > > > >  drivers/net/hns3/hns3_ethdev_vf.c   |    2 +-
> > > > >  drivers/vdpa/ifc/base/ifcvf_osdep.h |    2 +-
> > > > >  lib/librte_pci/Makefile             |    1 +
> > > > >  lib/librte_pci/meson.build          |    2 +-
> > > > >  lib/librte_pci/rte_pci_regs.h       | 1075 +++++++++++++++++++++++++++
> > > > >  8 files changed, 1082 insertions(+), 6 deletions(-)
> > > > >  create mode 100644 lib/librte_pci/rte_pci_regs.h
> > > > >
> > > >
> > > > [...]
> > > >
> > > > > diff --git a/lib/librte_pci/rte_pci_regs.h b/lib/librte_pci/rte_pci_regs.h
> > > > > new file mode 100644
> > > > > index 000000000..1d11f4de5
> > > > > --- /dev/null
> > > > > +++ b/lib/librte_pci/rte_pci_regs.h
> > > > > @@ -0,0 +1,1075 @@
> > > > > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> > > > > +/*
> > > >
> > > > This file is delivered alongside the PCI lib, targeting userspace.
> > > > This seems to be an exception to the license policy described in
> > > > license/README. Code shared between kernel and userspace is expected
> > > > to be dual-licensed BSD-3 and GPL-2.0.
> > > >
> > > > As it is a copy of Linux user includes, re-licensing it as BSD-3 as well
> > > > is not possible.
> > > >
> > > > So I think it might require a techboard + governing board exception
> > > > approval. Ferruh or Thomas, what do you think?
> >
> > I think, instead of importing GPL-2.0 file, We can add the constants
> > as need by the DPDK
> > as symbols start from RTE_PCI_*(It will fix up the namespace as well).
>
> If symbols can be found in /usr/include/, don't add anything.

Not by default on all the distros. It is part of pciutils library.
Moreover, we need these symbols for Windows OS as well.
IMO, We should add absolute minimum constants that needed for DPDK as RTE_PCI_*


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