linux-kernel - Re: [PATCH net-next v5 2/2] net: thunderx: add timestamping support

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Date:   Tue, 12 Dec 2017 11:47:04 -0800
From:   Joe Perches <joe@...ches.com>
To:     Richard Cochran <richardcochran@...il.com>,
        Aleksey Makarov <aleksey.makarov@...ium.com>
Cc:     netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        "Goutham, Sunil" <Sunil.Goutham@...ium.com>,
        Radoslaw Biernacki <rad@...ihalf.com>,
        Robert Richter <rric@...nel.org>,
        David Daney <ddaney@...iumnetworks.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Sunil Goutham <sgoutham@...ium.com>
Subject: Re: [PATCH net-next v5 2/2] net: thunderx: add timestamping support

On Mon, 2017-12-11 at 15:36 -0800, Richard Cochran wrote:
> On Mon, Dec 11, 2017 at 05:14:31PM +0300, Aleksey Makarov wrote:
> > @@ -880,6 +889,46 @@ static void nic_pause_frame(struct nicpf *nic, int vf, struct pfc *cfg)
> >  	}
> >  }
> >  
> > +/* Enable or disable HW timestamping by BGX for pkts received on a LMAC */
> > +static void nic_config_timestamp(struct nicpf *nic, int vf, struct set_ptp *ptp)
> > +{
> > +	struct pkind_cfg *pkind;
> > +	u8 lmac, bgx_idx;
> > +	u64 pkind_val, pkind_idx;
> > +
> > +	if (vf >= nic->num_vf_en)
> > +		return;
> > +
> > +	bgx_idx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]);
> > +	lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]);
> > +
> > +	pkind_idx = lmac + bgx_idx * MAX_LMAC_PER_BGX;
> > +	pkind_val = nic_reg_read(nic, NIC_PF_PKIND_0_15_CFG | (pkind_idx << 3));
> > +	pkind = (struct pkind_cfg *)&pkind_val;
> > +
> > +	if (ptp->enable && !pkind->hdr_sl) {
> > +		/* Skiplen to exclude 8byte timestamp while parsing pkt
> > +		 * If not configured, will result in L2 errors.
> > +		 */
> > +		pkind->hdr_sl = 4;
> > +		/* Adjust max packet length allowed */
> > +		pkind->maxlen += (pkind->hdr_sl * 2);

Are all compilers smart enough to set this to 8?
I rather doubt a compiler is even allowed to.