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

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Message-ID: <20231007145217.GB831234@kernel.org>
Date:   Sat, 7 Oct 2023 16:52:17 +0200
From:   Simon Horman <horms@...nel.org>
To:     Sai Krishna <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, sgoutham@...vell.com,
        gakula@...vell.com, richardcochran@...il.com, lcherian@...vell.com,
        jerinj@...vell.com, hkelam@...vell.com, sbhatta@...vell.com
Subject: 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).

> +		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
> 
>