Re: [PATCH v1 3/6] net/can: Add can_dlc2len and can_len2dlc for CAN FD.

[Vikram Garhwal <fnu.vikram@xilinx.com>]

On Thu, Sep 03, 2020 at 08:12:42AM +0200, Pavel Pisa wrote:
Hey Pavel,
Thanks for clarifying this and sharing the relevant links.

Regards,
Vikram
> Hello Vikram,
>
> On Thursday 03 of September 2020 07:43:34 Vikram Garhwal wrote:
> > On Tue, Jul 14, 2020 at 02:20:16PM +0200, pisa@cmp.felk.cvut.cz wrote:
> > Hi Pavel,
> >
> > > From: Jan Charvat <charvj10@fel.cvut.cz>
> > >
> > > Signed-off-by: Jan Charvat <charvj10@fel.cvut.cz>
> > > Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Reviewed-by: Vikram Garhwal <fnu.vikram@xilinx.com>
> > > ---
> > >  include/net/can_emu.h |  4 ++++
> > >  net/can/can_core.c    | 36 ++++++++++++++++++++++++++++++++++++
> > >  2 files changed, 40 insertions(+)
> > >
> > > diff --git a/include/net/can_emu.h b/include/net/can_emu.h
> > > index c6164dcfb4..7d395fbb9b 100644
> > > --- a/include/net/can_emu.h
> > > +++ b/include/net/can_emu.h
> > > @@ -127,4 +127,8 @@ int can_bus_client_set_filters(CanBusClientState *,
> > >                                 const struct qemu_can_filter *filters,
> > >                                 size_t filters_cnt);
> > >
> > > +uint8_t can_dlc2len(uint8_t can_dlc);
> > > +
> > > +uint8_t can_len2dlc(uint8_t len);
> > > +
> >
> > These function are aimed for canfd. Perhaps rename these to canfd_dlc2len
> > and canfd_len2dlc for better distinction?
> > Rest of the patch looks good to me.
>
> I do not insits on name. But function correspond 1:1 to the Linux
> kernel ones
>
> https://elixir.bootlin.com/linux/latest/source/drivers/net/can/dev.c#L34
>
> These functions/tables are very short, but may it be, we should add comment
> about their origin. This part of original file is Oliver Hartkopp
> contribution
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/can/dev.c?h=v5.9-rc3&id=1e0625facab2e871472472b7df87d8fbe6caf75a
>
> some other helpers are from Wolfgang Grandegger and me.
>
> Best wishes,
>
> Pavel