netdev - Re: [net-next v3 11/15] iecm: Add splitq TX/RX

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Date:   Fri, 26 Jun 2020 12:58:06 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:     davem@...emloft.net, Alice Michael <alice.michael@...el.com>,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        Alan Brady <alan.brady@...el.com>,
        Phani Burra <phani.r.burra@...el.com>,
        Joshua Hay <joshua.a.hay@...el.com>,
        Madhu Chittim <madhu.chittim@...el.com>,
        Pavan Kumar Linga <pavan.kumar.linga@...el.com>,
        Donald Skidmore <donald.c.skidmore@...el.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Sridhar Samudrala <sridhar.samudrala@...el.com>
Subject: Re: [net-next v3 11/15] iecm: Add splitq TX/RX

On Thu, 25 Jun 2020 19:07:33 -0700 Jeff Kirsher wrote:
> @@ -1315,7 +1489,18 @@ iecm_tx_splitq_clean(struct iecm_queue *tx_q, u16 end, int napi_budget,
>   */
>  static inline void iecm_tx_hw_tstamp(struct sk_buff *skb, u8 *desc_ts)

Pretty sure you don't need the inline here. It's static function with
one caller.

>  {
> -	/* stub */
> +	struct skb_shared_hwtstamps hwtstamps;
> +	u64 tstamp;
> +
> +	/* Only report timestamp to stack if requested */
> +	if (!likely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
> +		return;
> +
> +	tstamp = (desc_ts[0] | (desc_ts[1] << 8) | (desc_ts[2] & 0x3F) << 16);
> +	hwtstamps.hwtstamp =
> +		ns_to_ktime(tstamp << IECM_TW_TIME_STAMP_GRAN_512_DIV_S);
> +
> +	skb_tstamp_tx(skb, &hwtstamps);
>  }

Why is there time stamp reading support if you have no ts_info
configuration on ethtool side at all and no PHC support?