netdev - Re: [Patch v2 net-next 3/7] octeontx2-pf: ethtool fec mode support

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Date:   Sat, 30 Jan 2021 10:05:12 +0000
From:   Hariprasad Kelam <hkelam@...vell.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
CC:     Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Geethasowjanya Akula <gakula@...vell.com>,
        Jerin Jacob Kollanukkaran <jerinj@...vell.com>,
        Subbaraya Sundeep Bhatta <sbhatta@...vell.com>,
        Christina Jacob <cjacob@...vell.com>
Subject: Re: [Patch v2 net-next 3/7] octeontx2-pf: ethtool fec mode support

Hi Willem,

> -----Original Message-----
> From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
> Sent: Thursday, January 28, 2021 2:01 AM
> To: Hariprasad Kelam <hkelam@...vell.com>
> Cc: Network Development <netdev@...r.kernel.org>; LKML <linux-
> kernel@...r.kernel.org>; David Miller <davem@...emloft.net>; Jakub
> Kicinski <kuba@...nel.org>; Sunil Kovvuri Goutham
> <sgoutham@...vell.com>; Linu Cherian <lcherian@...vell.com>;
> Geethasowjanya Akula <gakula@...vell.com>; Jerin Jacob Kollanukkaran
> <jerinj@...vell.com>; Subbaraya Sundeep Bhatta <sbhatta@...vell.com>;
> Christina Jacob <cjacob@...vell.com>
> Subject: [EXT] Re: [Patch v2 net-next 3/7] octeontx2-pf: ethtool fec mode
> support
> 
> External Email
> 
> ----------------------------------------------------------------------
> On Wed, Jan 27, 2021 at 4:03 AM Hariprasad Kelam <hkelam@...vell.com>
> wrote:
> >
> > From: Christina Jacob <cjacob@...vell.com>
> >
> > Add ethtool support to configure fec modes baser/rs and support to
> > fecth FEC stats from CGX as well PHY.
> >
> > Configure fec mode
> >         - ethtool --set-fec eth0 encoding rs/baser/off/auto Query fec
> > mode
> >         - ethtool --show-fec eth0
> >
> > Signed-off-by: Christina Jacob <cjacob@...vell.com>
> > Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
> > Signed-off-by: Hariprasad Kelam <hkelam@...vell.com>
> > ---
> >  .../ethernet/marvell/octeontx2/nic/otx2_common.c   |  23 +++
> >  .../ethernet/marvell/octeontx2/nic/otx2_common.h   |   6 +
> >  .../ethernet/marvell/octeontx2/nic/otx2_ethtool.c  | 181
> ++++++++++++++++++++-
> >  .../net/ethernet/marvell/octeontx2/nic/otx2_pf.c   |   3 +
> >  4 files changed, 211 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> > b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> > index bdfa2e2..f7e5450 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> > +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> > @@ -60,6 +60,22 @@ void otx2_update_lmac_stats(struct otx2_nic *pfvf)
> >         mutex_unlock(&pfvf->mbox.lock);  }
> >
> > +void otx2_update_lmac_fec_stats(struct otx2_nic *pfvf) {
> > +       struct msg_req *req;
> > +
> > +       if (!netif_running(pfvf->netdev))
> > +               return;
> > +       mutex_lock(&pfvf->mbox.lock);
> > +       req = otx2_mbox_alloc_msg_cgx_fec_stats(&pfvf->mbox);
> > +       if (!req) {
> > +               mutex_unlock(&pfvf->mbox.lock);
> > +               return;
> > +       }
> > +       otx2_sync_mbox_msg(&pfvf->mbox);
> 
> Perhaps simpler to have a single exit from the critical section:
> 
Agreed will fix this in next version.

>   if (req)
>     otx2_update_lmac_fec_stats
> 
> > +       mutex_unlock(&pfvf->mbox.lock); }
> 
> Also, should this function return an error on failure? The caller returns errors
> in other cases.

Caller of this function otx2_get_sset_count . Where driver suppose to return number of stats. 
This function is just to update local netdev counters fec_corr_blks/ fec_uncorr_blks. So failure
Of this function should not effect.

Thanks,
Hariprasad k