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Date: Sun, 24 Jan 2021 17:16:41 +0000
From: Hariprasad Kelam <hkelam@...vell.com>
To: Jakub Kicinski <kuba@...nel.org>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"davem@...emloft.net" <davem@...emloft.net>,
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: [EXT] Re: [net-next PATCH 3/7] octeontx2-pf: ethtool fec mode
support
Hi Jakub,
> -----Original Message-----
> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Saturday, January 23, 2021 10:00 AM
> To: Hariprasad Kelam <hkelam@...vell.com>
> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
> davem@...emloft.net; 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: [net-next PATCH 3/7] octeontx2-pf: ethtool fec mode
> support
>
> External Email
>
> ----------------------------------------------------------------------
> On Thu, 21 Jan 2021 13:23:25 +0530 Hariprasad Kelam 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 | 174
> ++++++++++++++++++++-
> > .../net/ethernet/marvell/octeontx2/nic/otx2_pf.c | 3 +
> > 4 files changed, 204 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..d09119b 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);
> > + mutex_unlock(&pfvf->mbox.lock);
> > +}
> > +
> > int otx2_update_rq_stats(struct otx2_nic *pfvf, int qidx) {
> > struct otx2_rcv_queue *rq = &pfvf->qset.rq[qidx]; @@ -1491,6
> > +1507,13 @@ void mbox_handler_cgx_stats(struct otx2_nic *pfvf,
> > pfvf->hw.cgx_tx_stats[id] = rsp->tx_stats[id]; }
> >
> > +void mbox_handler_cgx_fec_stats(struct otx2_nic *pfvf,
> > + struct cgx_fec_stats_rsp *rsp)
> > +{
> > + pfvf->hw.cgx_fec_corr_blks += rsp->fec_corr_blks;
> > + pfvf->hw.cgx_fec_uncorr_blks += rsp->fec_uncorr_blks;
>
> double indented
>
I will fix this in V2.
> > +}
> > +
> > void mbox_handler_nix_txsch_alloc(struct otx2_nic *pf,
> > struct nix_txsch_alloc_rsp *rsp) {
>
> > @@ -183,12 +210,42 @@ static void otx2_get_ethtool_stats(struct
> net_device *netdev,
> > for (stat = 0; stat < CGX_TX_STATS_COUNT; stat++)
> > *(data++) = pfvf->hw.cgx_tx_stats[stat];
> > *(data++) = pfvf->reset_count;
> > +
> > + if (pfvf->linfo.fec == OTX2_FEC_NONE)
> > + return;
>
> Don't hide the stats based on configuration.
> Getting number of stats and requesting them are two different syscalls.
>
Agreed . While getting number of stats also , check is there to ensure interface
Has valid fec mode.
if (pfvf->linfo.fec) {
sprintf(data, "Fec Corrected Errors: ");
These checks ensures number of stats and request them are in sync.
> > + fec_corr_blks = pfvf->hw.cgx_fec_corr_blks;
> > + fec_uncorr_blks = pfvf->hw.cgx_fec_uncorr_blks;
> > +
> > + rsp = otx2_get_fwdata(pfvf);
> > + if (!IS_ERR(rsp) && rsp->fwdata.phy.misc.has_fec_stats &&
> > + !otx2_get_phy_fec_stats(pfvf)) {
> > + /* Fetch fwdata again because it's been recently populated
> with
> > + * latest PHY FEC stats.
> > + */
> > + rsp = otx2_get_fwdata(pfvf);
> > + if (!IS_ERR(rsp)) {
> > + struct fec_stats_s *p = &rsp->fwdata.phy.fec_stats;
> > +
> > + if (pfvf->linfo.fec == OTX2_FEC_BASER) {
> > + fec_corr_blks = p->brfec_corr_blks;
> > + fec_uncorr_blks = p->brfec_uncorr_blks;
> > + } else {
> > + fec_corr_blks = p->rsfec_corr_cws;
> > + fec_uncorr_blks = p->rsfec_uncorr_cws;
> > + }
> > + }
> > + }
> > +
> > + *(data++) = fec_corr_blks;
> > + *(data++) = fec_uncorr_blks;
> > }
>
> > +static int otx2_get_fecparam(struct net_device *netdev,
> > + struct ethtool_fecparam *fecparam) {
> > + struct otx2_nic *pfvf = netdev_priv(netdev);
> > + struct cgx_fw_data *rsp;
> > + int fec[] = {
>
> const
>
Will fix in V2.
> > + ETHTOOL_FEC_OFF,
> > + ETHTOOL_FEC_BASER,
> > + ETHTOOL_FEC_RS,
> > + ETHTOOL_FEC_BASER | ETHTOOL_FEC_RS}; #define
> FEC_MAX_INDEX 3
> > + if (pfvf->linfo.fec < FEC_MAX_INDEX)
> > + fecparam->active_fec = fec[pfvf->linfo.fec];
> > +
> > + rsp = otx2_get_fwdata(pfvf);
> > + if (IS_ERR(rsp))
> > + return PTR_ERR(rsp);
> > +
> > + if (rsp->fwdata.supported_fec <= FEC_MAX_INDEX) {
> > + if (!rsp->fwdata.supported_fec)
> > + fecparam->fec = ETHTOOL_FEC_NONE;
> > + else
> > + fecparam->fec = fec[rsp->fwdata.supported_fec];
> > + }
> > + return 0;
> > +}
> > +
> > +static int otx2_set_fecparam(struct net_device *netdev,
> > + struct ethtool_fecparam *fecparam) {
> > + struct otx2_nic *pfvf = netdev_priv(netdev);
> > + struct mbox *mbox = &pfvf->mbox;
> > + struct fec_mode *req, *rsp;
> > + int err = 0, fec = 0;
> > +
> > + switch (fecparam->fec) {
> > + case ETHTOOL_FEC_OFF:
> > + fec = OTX2_FEC_NONE;
> > + break;
> > + case ETHTOOL_FEC_RS:
> > + fec = OTX2_FEC_RS;
> > + break;
> > + case ETHTOOL_FEC_BASER:
> > + fec = OTX2_FEC_BASER;
> > + break;
> > + default:
> > + fec = OTX2_FEC_NONE;
>
> IIRC fecparam->fec is a bitmask, you can't assume other than one bit set is
> NONE.
Agreed . Will fix in V2.
>
> > + break;
> > + }
> > +
> > + if (fec == pfvf->linfo.fec)
> > + return 0;
> > +
> > + mutex_lock(&mbox->lock);
> > + req = otx2_mbox_alloc_msg_cgx_set_fec_param(&pfvf->mbox);
> > + if (!req) {
> > + err = -EAGAIN;
>
> Why -EAGAIN? When does msg allocation fail?
>
Agreed . Message allocation fails incase No memory. Will fix this in V2.
> > + goto end;
> > + }
> > + req->fec = fec;
> > + err = otx2_sync_mbox_msg(&pfvf->mbox);
> > + if (err)
> > + goto end;
> > +
> > + rsp = (struct fec_mode *)otx2_mbox_get_rsp(&pfvf->mbox.mbox,
> > + 0, &req->hdr);
> > + if (rsp->fec >= 0) {
> > + pfvf->linfo.fec = rsp->fec;
> > + pfvf->hw.cgx_fec_corr_blks = 0;
> > + pfvf->hw.cgx_fec_uncorr_blks = 0;
>
> Are you clearing stats every time FEC changes?
>
Netdev driver gets fec stats from firmware. When user changes fec mode , counters local
To netdev driver becomes stale. So clearing fec counters.
> > +
>
> spurious new line
>
Will fix in v2.
> > + } else {
> > + err = rsp->fec;
> > + }
> > +
> > +end: mutex_unlock(&mbox->lock);
>
> label on a separate line
>
Will fix in v2.
Thanks,
Hariprasad k
> > + return err;
> > +}
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