linux-kernel - Re: [net PATCH] octeontx2-af: Enable hardware timestamping for VFs

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Message-ID: <BY3PR18MB4707B18E60AF632C4A9501BDA0C4A@BY3PR18MB4707.namprd18.prod.outlook.com>
Date:   Tue, 3 Oct 2023 07:21:35 +0000
From:   Sai Krishna Gajula <saikrishnag@...vell.com>
To:     Jacob Keller <jacob.e.keller@...el.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>,
        "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>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        Linu Cherian <lcherian@...vell.com>,
        Jerin Jacob Kollanukkaran <jerinj@...vell.com>,
        Hariprasad Kelam <hkelam@...vell.com>,
        Subbaraya Sundeep Bhatta <sbhatta@...vell.com>
Subject: Re: [net PATCH] octeontx2-af: Enable hardware timestamping for VFs


> -----Original Message-----
> From: Jacob Keller <jacob.e.keller@...el.com>
> Sent: Friday, September 29, 2023 11:24 PM
> To: Sai Krishna Gajula <saikrishnag@...vell.com>; davem@...emloft.net;
> edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Sunil Kovvuri
> Goutham <sgoutham@...vell.com>; Geethasowjanya Akula
> <gakula@...vell.com>; richardcochran@...il.com; Linu Cherian
> <lcherian@...vell.com>; Jerin Jacob Kollanukkaran <jerinj@...vell.com>;
> Hariprasad Kelam <hkelam@...vell.com>; Subbaraya Sundeep Bhatta
> <sbhatta@...vell.com>
> Subject: Re: [net PATCH] octeontx2-af: Enable hardware timestamping
> for VFs
> 
> 
> On 9/29/2023 12:16 AM, Sai Krishna wrote:
> > Currently for VFs, mailbox returns error when hardware timestamping
> > enable is requested. This patch fixes this issue.
> >
> 
> The subject title implies that this is implementing a new feature (and thus
> not really a good candidate for net), but the content implies this is a fix for an
> existing feature thats not working properly.
> 
> It could use a slightly improved commit message.

Ack, I will modify the commit message in V2

> 
> > Fixes: 421572175ba5 ("octeontx2-af: Support to enable/disable HW
> > timestamping")
> > Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>
> > Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
> > Signed-off-by: Sai Krishna <saikrishnag@...vell.com>
> 
> Typically the author signed-off-by should go first, and then other signed-off-
> by are for people in the chain of patch delivery. If the other two co-authored
> the patch they should have Co-developed-by tag or something. Otherwise I
> would expect that Subbaraya Sundeepd would be the patch author since
> that signed-off-by is first.

Ack, I will change the author name in V2

> 
> > ---
> >  drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c | 7 +++----
> >  1 file changed, 3 insertions(+), 4 deletions(-)
> >
> 
> The fix itself seems straight forward, though the comment is confusing to
> me. You also changed the return from -ENODEV to -EPERM which makes
> sense enough I suppose, but thats not called out in the change.
> 

Ack, I will modify the commit message in V2

> > diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
> > b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
> > index f2b1edf1bb43..aba0c530160c 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
> > +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
> > @@ -756,12 +756,11 @@ static int rvu_cgx_ptp_rx_cfg(struct rvu *rvu, u16
> pcifunc, bool enable)
> >  	if (!is_mac_feature_supported(rvu, pf, RVU_LMAC_FEAT_PTP))
> >  		return 0;
> >
> > -	/* This msg is expected only from PFs that are mapped to CGX
> LMACs,
> > +	/* This msg is expected only from PFs that are mapped to CGX/RPM
> > +LMACs,
> >  	 * if received from other PF/VF simply ACK, nothing to do.
> >  	 */
> 
> This comment implies to me that we wouldn't expect this message from a
> VF?

Ack, I will modify the comment in V2

> 
> > -	if ((pcifunc & RVU_PFVF_FUNC_MASK) ||
> > -	    !is_pf_cgxmapped(rvu, pf))
> > -		return -ENODEV;
> > +	if (!is_pf_cgxmapped(rvu, rvu_get_pf(pcifunc)))
> > +		return -EPERM;
> >
> >  	rvu_get_cgx_lmac_id(rvu->pf2cgxlmac_map[pf], &cgx_id,
> &lmac_id);
> >  	cgxd = rvu_cgx_pdata(cgx_id, rvu);