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Message-ID:
<SN7PR18MB53149716909DE5993145509AE3E32@SN7PR18MB5314.namprd18.prod.outlook.com>
Date: Tue, 14 May 2024 06:39:45 +0000
From: Bharat Bhushan <bbhushan2@...vell.com>
To: Simon Horman <horms@...nel.org>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Sunil Kovvuri
Goutham <sgoutham@...vell.com>,
Geethasowjanya Akula <gakula@...vell.com>,
Subbaraya Sundeep Bhatta <sbhatta@...vell.com>,
Hariprasad Kelam
<hkelam@...vell.com>,
"davem@...emloft.net" <davem@...emloft.net>,
"edumazet@...gle.com" <edumazet@...gle.com>,
"kuba@...nel.org"
<kuba@...nel.org>,
"pabeni@...hat.com" <pabeni@...hat.com>,
Jerin Jacob
<jerinj@...vell.com>, Linu Cherian <lcherian@...vell.com>,
"richardcochran@...il.com" <richardcochran@...il.com>
Subject: RE: [EXTERNAL] Re: [net-next,v2 3/8] octeontx2-af: Disable
backpressure between CPT and NIX
Please see inline
> -----Original Message-----
> From: Simon Horman <horms@...nel.org>
> Sent: Monday, May 13, 2024 9:45 PM
> To: Bharat Bhushan <bbhushan2@...vell.com>
> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Sunil Kovvuri
> Goutham <sgoutham@...vell.com>; Geethasowjanya Akula
> <gakula@...vell.com>; Subbaraya Sundeep Bhatta <sbhatta@...vell.com>;
> Hariprasad Kelam <hkelam@...vell.com>; davem@...emloft.net;
> edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com; Jerin Jacob
> <jerinj@...vell.com>; Linu Cherian <lcherian@...vell.com>;
> richardcochran@...il.com
> Subject: [EXTERNAL] Re: [net-next,v2 3/8] octeontx2-af: Disable backpressure
> between CPT and NIX
>
>
> ----------------------------------------------------------------------
> On Mon, May 13, 2024 at 04:24:41PM +0530, Bharat Bhushan wrote:
> > NIX can assert backpressure to CPT on the NIX<=>CPT link.
> > Keep the backpressure disabled for now. NIX block anyways
> > handles backpressure asserted by MAC due to PFC or flow
> > control pkts.
> >
> > Signed-off-by: Bharat Bhushan <bbhushan2@...vell.com>
>
> ...
>
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
> b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
>
> ...
>
> > @@ -592,8 +596,16 @@ int rvu_mbox_handler_nix_bp_disable(struct rvu
> *rvu,
> > bp = &nix_hw->bp;
> > chan_base = pfvf->rx_chan_base + req->chan_base;
> > for (chan = chan_base; chan < (chan_base + req->chan_cnt); chan++) {
> > - cfg = rvu_read64(rvu, blkaddr,
> NIX_AF_RX_CHANX_CFG(chan));
> > - rvu_write64(rvu, blkaddr, NIX_AF_RX_CHANX_CFG(chan),
> > + /* CPT channel for a given link channel is always
> > + * assumed to be BIT(11) set in link channel.
> > + */
> > + if (cpt_link)
> > + chan_v = chan | BIT(11);
> > + else
> > + chan_v = chan;
>
> Hi Bharat,
>
> The chan_v logic above seems to appear twice in this patch.
> I'd suggest adding a helper.
Will fix in next version.
>
> > +
> > + cfg = rvu_read64(rvu, blkaddr,
> NIX_AF_RX_CHANX_CFG(chan_v));
> > + rvu_write64(rvu, blkaddr, NIX_AF_RX_CHANX_CFG(chan_v),
> > cfg & ~BIT_ULL(16));
> >
> > if (type == NIX_INTF_TYPE_LBK) {
>
> ...
>
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> > index 7ec99c8d610c..e9d2e039a322 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> > +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> > @@ -1705,6 +1705,31 @@ int otx2_nix_config_bp(struct otx2_nic *pfvf,
> bool enable)
> > }
> > EXPORT_SYMBOL(otx2_nix_config_bp);
> >
> > +int otx2_nix_cpt_config_bp(struct otx2_nic *pfvf, bool enable)
> > +{
> > + struct nix_bp_cfg_req *req;
> > +
> > + if (enable)
> > + req = otx2_mbox_alloc_msg_nix_cpt_bp_enable(&pfvf-
> >mbox);
> > + else
> > + req = otx2_mbox_alloc_msg_nix_cpt_bp_disable(&pfvf-
> >mbox);
> > +
> > + if (!req)
> > + return -ENOMEM;
> > +
> > + req->chan_base = 0;
> > +#ifdef CONFIG_DCB
> > + req->chan_cnt = pfvf->pfc_en ? IEEE_8021QAZ_MAX_TCS : 1;
> > + req->bpid_per_chan = pfvf->pfc_en ? 1 : 0;
> > +#else
> > + req->chan_cnt = 1;
> > + req->bpid_per_chan = 0;
> > +#endif
>
> IMHO, inline #ifdefs reduce readability and reduce maintainability.
>
> Would it be possible to either:
>
> 1. Include the pfc_en field in struct otx2_nic and make
> sure it is set to 0 if CONFIG_DCB is unset; or
> 2. Provide a wrapper that returns 0 if CONFIG_DCB is unset,
> otherwise pfvf->pfc_en.
>
> I suspect 1 will have little downside and be easiest to implement.
pfc_en is already a field of otx2_nic but under CONFIG_DCB. Will fix by adding a wrapper function like:
static bool is_pfc_enabled(struct otx2_nic *pfvf)
{
#ifdef CONFIG_DCB
return pfvf->pfc_en ? true : false;
#endif
return false;
}
Using same like..
...
if (is_pfc_enabled(pfvf)) {
req->chan_cnt = IEEE_8021QAZ_MAX_TCS;
req->bpid_per_chan = 1;
} else {
req->chan_cnt = 1;
req->bpid_per_chan = 0;
}
...
Thanks
-Bharat
>
> > +
> > + return otx2_sync_mbox_msg(&pfvf->mbox);
> > +}
> > +EXPORT_SYMBOL(otx2_nix_cpt_config_bp);
> > +
> > /* Mbox message handlers */
> > void mbox_handler_cgx_stats(struct otx2_nic *pfvf,
> > struct cgx_stats_rsp *rsp)
>
> ...
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