netdev - Re: [PATCH RFC 3/6] dpaa2-mac: add MC API for the DPMAC object

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Date:   Mon, 17 Jun 2019 16:28:13 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ioana Ciornei <ioana.ciornei@....com>
Cc:     "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Alexandru Marginean <alexandru.marginean@....com>,
        Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>
Subject: Re: [PATCH RFC 3/6] dpaa2-mac: add MC API for the DPMAC object

On Fri, Jun 14, 2019 at 02:06:05PM +0000, Ioana Ciornei wrote:
> > Subject: Re: [PATCH RFC 3/6] dpaa2-mac: add MC API for the DPMAC object
> > 
> > > +/**
> > > + * dpmac_set_link_state() - Set the Ethernet link status
> > > + * @mc_io:      Pointer to opaque I/O object
> > > + * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
> > > + * @token:      Token of DPMAC object
> > > + * @link_state: Link state configuration
> > > + *
> > > + * Return:      '0' on Success; Error code otherwise.
> > > + */
> > > +int dpmac_set_link_state(struct fsl_mc_io *mc_io,
> > > +			 u32 cmd_flags,
> > > +			 u16 token,
> > > +			 struct dpmac_link_state *link_state) {
> > > +	struct dpmac_cmd_set_link_state *cmd_params;
> > > +	struct fsl_mc_command cmd = { 0 };
> > > +
> > > +	/* prepare command */
> > > +	cmd.header =
> > mc_encode_cmd_header(DPMAC_CMDID_SET_LINK_STATE,
> > > +					  cmd_flags,
> > > +					  token);
> > > +	cmd_params = (struct dpmac_cmd_set_link_state *)cmd.params;
> > > +	cmd_params->options = cpu_to_le64(link_state->options);
> > > +	cmd_params->rate = cpu_to_le32(link_state->rate);
> > > +	dpmac_set_field(cmd_params->state, STATE, link_state->up);
> > > +	dpmac_set_field(cmd_params->state, STATE_VALID,
> > > +			link_state->state_valid);
> > > +	cmd_params->supported = cpu_to_le64(link_state->supported);
> > > +	cmd_params->advertising = cpu_to_le64(link_state->advertising);
> > 
> > I don't understand what supported and advertising mean in the context of a
> > MAC. PHY yes, but MAC?
> 
> It's still in the context of the PHY.

If this is for the PHY why are you not using DPNI? That is the object
which represents the PHY.

> As stated in the previous reply, the MAC can do pause, asym pause
> but not half duplex or EEE.

I'm very surprised it cannot do EEE! I hope the firmware is getting
the auto-neg advertisement correct.

   Andrew