RE: [EXT] Re: [net PATCH] octeontx2-af: Adjust Tx credits when MCS external bypass is disabled

[Geethasowjanya Akula]

> -----Original Message-----
> From: Paolo Abeni <pabeni@xxxxxxxxxx>
> Sent: Tuesday, July 18, 2023 4:39 PM
> To: Geethasowjanya Akula <gakula@xxxxxxxxxxx>; netdev@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx
> Cc: kuba@xxxxxxxxxx; davem@xxxxxxxxxxxxx; edumazet@xxxxxxxxxx; Sunil
> Kovvuri Goutham <sgoutham@xxxxxxxxxxx>; Subbaraya Sundeep Bhatta
> <sbhatta@xxxxxxxxxxx>; Hariprasad Kelam <hkelam@xxxxxxxxxxx>; Nithin
> Kumar Dabilpuram <ndabilpuram@xxxxxxxxxxx>
> Subject: [EXT] Re: [net PATCH] octeontx2-af: Adjust Tx credits when MCS
> external bypass is disabled
> 
> External Email
> 
> ----------------------------------------------------------------------
> On Sun, 2023-07-16 at 14:46 +0530, Geetha sowjanya wrote:
> > From: Nithin Dabilpuram <ndabilpuram@xxxxxxxxxxx>
> >
> > When MCS external bypass is disabled, MCS returns additional
> > 2 credits(32B) for every packet Tx'ed on LMAC. To account for these
> > extra credits, NIX_AF_TX_LINKX_NORM_CREDIT.CC_MCS_CNT
> > needs to be configured as otherwise NIX Tx credits would overflow and
> > will never be returned to idle state credit count causing issues with
> > credit control and MTU change.
> >
> > This patch fixes the same by configuring CC_MCS_CNT at probe time for
> > MCS enabled SoC's
> >
> > Fixes: bd69476e86fc ("octeontx2-af: cn10k: mcs: Install a default TCAM
> > for normal traffic")
> > Signed-off-by: Nithin Dabilpuram <ndabilpuram@xxxxxxxxxxx>
> > Signed-off-by: Geetha sowjanya <gakula@xxxxxxxxxxx>
> > Signed-off-by: Sunil Goutham <sgoutham@xxxxxxxxxxx>
> > ---
> >  drivers/net/ethernet/marvell/octeontx2/af/mbox.h    |  2 +-
> >  drivers/net/ethernet/marvell/octeontx2/af/mcs.c     | 12 ++++++++++++
> >  drivers/net/ethernet/marvell/octeontx2/af/mcs.h     |  2 ++
> >  drivers/net/ethernet/marvell/octeontx2/af/rvu.h     |  1 +
> >  drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c |  8 ++++++++
> >  5 files changed, 24 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
> > b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
> > index eba307eee2b2..d78d72c0ca18 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
> > +++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
> > @@ -1914,7 +1914,7 @@ struct mcs_hw_info {
> >  	u8 tcam_entries;	/* RX/TX Tcam entries per mcs block */
> >  	u8 secy_entries;	/* RX/TX SECY entries per mcs block */
> >  	u8 sc_entries;		/* RX/TX SC CAM entries per mcs block */
> > -	u8 sa_entries;		/* PN table entries = SA entries */
> > +	u16 sa_entries;		/* PN table entries = SA entries */
> 
> This chunk looks like an unrelated bug-fix. Please move it to a separate patch
> or mention in the commit message why it's needed here.
Will submit v2 with updated commit messages.

Thanks,
Geetha.
> 
> Thanks!
> 
> Paolo