netdev - Re: [PATCH net v2] bnxt_en: reset PHC frequency in free-running mode

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Date:   Thu, 9 Mar 2023 10:10:32 +0530
From:   Pavan Chebbi <pavan.chebbi@...adcom.com>
To:     Vadim Fedorenko <vadfed@...a.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Andy Gospodarek <andrew.gospodarek@...adcom.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Richard Cochran <richardcochran@...il.com>,
        Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
        netdev@...r.kernel.org
Subject: Re: [PATCH net v2] bnxt_en: reset PHC frequency in free-running mode

On Wed, Mar 8, 2023 at 8:12 PM Vadim Fedorenko <vadfed@...a.com> wrote:
>
> +static int bnxt_ptp_adjfine_rtc(struct bnxt *bp, long scaled_ppm)
> +{
> +       s32 ppb = scaled_ppm_to_ppb(scaled_ppm);
> +       struct hwrm_port_mac_cfg_input *req;
> +       int rc;
> +
> +       rc = hwrm_req_init(bp, req, HWRM_PORT_MAC_CFG);
> +       if (rc)
> +               return rc;
> +
> +       req->ptp_freq_adj_ppb = cpu_to_le32(ppb);
> +       req->enables = cpu_to_le32(PORT_MAC_CFG_REQ_ENABLES_PTP_FREQ_ADJ_PPB);
> +       rc = hwrm_req_send(bp, req);
> +       if (rc)
> +               netdev_err(bp->dev,
> +                          "ptp adjfine failed. rc = %d\n", rc);

nit: can be a single line.

> +       return rc;
> +}
> +

> @@ -932,13 +937,15 @@ int bnxt_ptp_init(struct bnxt *bp, bool phc_cfg)
>         atomic_set(&ptp->tx_avail, BNXT_MAX_TX_TS);
>         spin_lock_init(&ptp->ptp_lock);
>
> -       if (bp->fw_cap & BNXT_FW_CAP_PTP_RTC) {
> +       if (BNXT_PTP_USE_RTC(ptp->bp)) {
>                 bnxt_ptp_timecounter_init(bp, false);
>                 rc = bnxt_ptp_init_rtc(bp, phc_cfg);
>                 if (rc)
>                         goto out;
>         } else {
>                 bnxt_ptp_timecounter_init(bp, true);
> +               if (bp->fw_cap & BNXT_FW_CAP_PTP_RTC)

I understand from your response on v1 as to why it will not affect you
if a new firmware does not report RTC on MH.
However, once you update the fw, any subsequent kernels upgrades will
prevent resetting the freq stored in the PHC.
Would changing the check to if (BNXT_MH(bp)) instead be a better option?

> +                       bnxt_ptp_adjfine_rtc(bp, 0);
>         }
>
>         ptp->ptp_info = bnxt_ptp_caps;
> --
> 2.30.2
>

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