linux-kernel - RE: [EXT] Re: [net PATCH v2] octeontx2-af: Fix hardware timestamping for VFs

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Date:   Wed, 11 Oct 2023 05:01:24 +0000
From:   Subbaraya Sundeep Bhatta <sbhatta@...vell.com>
To:     Simon Horman <horms@...nel.org>,
        Sai Krishna Gajula <saikrishnag@...vell.com>
CC:     "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>
Subject: RE: [EXT] Re: [net PATCH v2] octeontx2-af: Fix hardware timestamping
 for VFs

Hi Simon,

>-----Original Message-----
>From: Simon Horman <horms@...nel.org>
>Sent: Saturday, October 7, 2023 8:22 PM
>To: Sai Krishna Gajula <saikrishnag@...vell.com>
>Cc: 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: [EXT] Re: [net PATCH v2] octeontx2-af: Fix hardware timestamping for
>VFs
>On Tue, Oct 03, 2023 at 04:35:04PM +0530, Sai Krishna wrote:
>> From: Subbaraya Sundeep <sbhatta@...vell.com>
>>
>> Currently for VFs, mailbox returns ENODEV error when hardware timestamping
>> enable is requested. This patch fixes this issue. Modified this patch to
>> return EPERM error for the PF/VFs which are not attached to CGX/RPM.
>>
>> 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>
>> ---
>>  drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c | 7 +++----
>>  1 file changed, 3 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
>b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
>> index f2b1edf1bb43..f464640e188b 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 PF/VFs that are mapped to CGX/RPM
>LMACs,
>>  	 * if received from other PF/VF simply ACK, nothing to do.
>>  	 */
>> -	if ((pcifunc & RVU_PFVF_FUNC_MASK) ||
>> -	    !is_pf_cgxmapped(rvu, pf))
>> -		return -ENODEV;
>> +	if (!is_pf_cgxmapped(rvu, rvu_get_pf(pcifunc)))
>
>Hi Sai,
>
>I'm not clear on why this change substitutes pf for rvu_get_pf(pcifunc),
>as futher above in this function pf is set to the return value of
>rvu_get_pf(pcifunc).
>
Good catch. No need of rvu_get_pf(pcifunc) again. We will change and send v3.
Thanks for the review.

Sundeep

>> +		return -EPERM;
>>
>>  	rvu_get_cgx_lmac_id(rvu->pf2cgxlmac_map[pf], &cgx_id, &lmac_id);
>>  	cgxd = rvu_cgx_pdata(cgx_id, rvu);
>> --
>> 2.25.1
>>
>>