Some of KSZ9477 family switches provides EEE support. To enable it, we
just need to register set_mac_eee/set_mac_eee handlers and validate
supported chip version and port.
Signed-off-by: Oleksij Rempel <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
---
drivers/net/dsa/microchip/ksz_common.c | 65 ++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 46becc0382d6..0a2d78253d17 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2673,6 +2673,69 @@ static int ksz_max_mtu(struct dsa_switch *ds, int port)
return -EOPNOTSUPP;
}
+static int ksz_validate_eee(struct dsa_switch *ds, int port)
+{
+ struct ksz_device *dev = ds->priv;
+
+ if (!dev->info->internal_phy[port])
+ return -EOPNOTSUPP;
+
+ switch (dev->chip_id) {
+ case KSZ8563_CHIP_ID:
+ case KSZ9477_CHIP_ID:
+ case KSZ9563_CHIP_ID:
+ case KSZ9567_CHIP_ID:
+ case KSZ9893_CHIP_ID:
+ case KSZ9896_CHIP_ID:
+ case KSZ9897_CHIP_ID:
+ return 0;
+ }
+
+ return -EOPNOTSUPP;
+}
+
+static int ksz_get_mac_eee(struct dsa_switch *ds, int port,
+ struct ethtool_eee *e)
+{
+ int ret;
+
+ ret = ksz_validate_eee(ds, port);
+ if (ret)
+ return ret;
+
+ /* There is no documented control of Tx LPI configuration. */
+ e->tx_lpi_enabled = true;
+ /* There is no documented control of Tx LPI timer. According to tests
+ * Tx LPI timer seems to be set by default to minimal value.
+ */
+ e->tx_lpi_timer = 0;
+
+ return 0;
+}
+
+static int ksz_set_mac_eee(struct dsa_switch *ds, int port,
+ struct ethtool_eee *e)
+{
+ struct ksz_device *dev = ds->priv;
+ int ret;
+
+ ret = ksz_validate_eee(ds, port);
+ if (ret)
+ return ret;
+
+ if (!e->tx_lpi_enabled) {
+ dev_err(dev->dev, "Disabling EEE Tx LPI is not supported\n");
+ return -EINVAL;
+ }
+
+ if (e->tx_lpi_timer) {
+ dev_err(dev->dev, "Setting EEE Tx LPI timer is not supported\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static void ksz_set_xmii(struct ksz_device *dev, int port,
phy_interface_t interface)
{
@@ -3130,6 +3193,8 @@ static const struct dsa_switch_ops ksz_switch_ops = {
.port_txtstamp = ksz_port_txtstamp,
.port_rxtstamp = ksz_port_rxtstamp,
.port_setup_tc = ksz_setup_tc,
+ .get_mac_eee = ksz_get_mac_eee,
+ .set_mac_eee = ksz_set_mac_eee,
};
struct ksz_device *ksz_switch_alloc(struct device *base, void *priv)
--
2.30.2
Hi Oleksij,
On Wed, 2023-02-08 at 11:32 +0100, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
>
> Some of KSZ9477 family switches provides EEE support.
nit: If you can elaborate what are the chip supports will be good.
> To enable it, we
> just need to register set_mac_eee/set_mac_eee handlers and validate
> supported chip version and port.
>
> Signed-off-by: Oleksij Rempel <[email protected]>
> Reviewed-by: Andrew Lunn <[email protected]>
> ---
> drivers/net/dsa/microchip/ksz_common.c | 65
> ++++++++++++++++++++++++++
> 1 file changed, 65 insertions(+)
>
> diff --git a/drivers/net/dsa/microchip/ksz_common.c
> b/drivers/net/dsa/microchip/ksz_common.c
> index 46becc0382d6..0a2d78253d17 100644
> --- a/drivers/net/dsa/microchip/ksz_common.c
> +++ b/drivers/net/dsa/microchip/ksz_common.c
> @@ -2673,6 +2673,69 @@ static int ksz_max_mtu(struct dsa_switch *ds,
> int port)
> return -EOPNOTSUPP;
> }
>
> +static int ksz_get_mac_eee(struct dsa_switch *ds, int port,
> + struct ethtool_eee *e)
> +{
> + int ret;
> +
> + ret = ksz_validate_eee(ds, port);
> + if (ret)
> + return ret;
> +
> + /* There is no documented control of Tx LPI configuration. */
> + e->tx_lpi_enabled = true;
Blank line before comment will increase readability.
> + /* There is no documented control of Tx LPI timer. According
> to tests
> + * Tx LPI timer seems to be set by default to minimal value.
> + */
> + e->tx_lpi_timer = 0;
for lpi_enabled, you have used true and for lpi_timer you have used 0.
It can be consistent either true/false or 1/0.
> +
> + return 0;
> +}
> +
>
Hi Arun,
On Thu, Feb 09, 2023 at 04:07:11AM +0000, [email protected] wrote:
> Hi Oleksij,
> On Wed, 2023-02-08 at 11:32 +0100, Oleksij Rempel wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you
> > know the content is safe
> >
> > Some of KSZ9477 family switches provides EEE support.
>
> nit: If you can elaborate what are the chip supports will be good.
Do you mean list of supported chips or link speeds with EEE support?
> > To enable it, we
> > just need to register set_mac_eee/set_mac_eee handlers and validate
> > supported chip version and port.
> >
> > Signed-off-by: Oleksij Rempel <[email protected]>
> > Reviewed-by: Andrew Lunn <[email protected]>
> > ---
> > drivers/net/dsa/microchip/ksz_common.c | 65
> > ++++++++++++++++++++++++++
> > 1 file changed, 65 insertions(+)
> >
> > diff --git a/drivers/net/dsa/microchip/ksz_common.c
> > b/drivers/net/dsa/microchip/ksz_common.c
> > index 46becc0382d6..0a2d78253d17 100644
> > --- a/drivers/net/dsa/microchip/ksz_common.c
> > +++ b/drivers/net/dsa/microchip/ksz_common.c
> > @@ -2673,6 +2673,69 @@ static int ksz_max_mtu(struct dsa_switch *ds,
> > int port)
> > return -EOPNOTSUPP;
> > }
> >
> > +static int ksz_get_mac_eee(struct dsa_switch *ds, int port,
> > + struct ethtool_eee *e)
> > +{
> > + int ret;
> > +
> > + ret = ksz_validate_eee(ds, port);
> > + if (ret)
> > + return ret;
> > +
> > + /* There is no documented control of Tx LPI configuration. */
> > + e->tx_lpi_enabled = true;
>
> Blank line before comment will increase readability.
>
> > + /* There is no documented control of Tx LPI timer. According
> > to tests
> > + * Tx LPI timer seems to be set by default to minimal value.
> > + */
> > + e->tx_lpi_timer = 0;
>
> for lpi_enabled, you have used true and for lpi_timer you have used 0.
> It can be consistent either true/false or 1/0.
tx_lpi_enabled has only on/off states. This is why i use bool values.
tx_lpi_timer is a range in microseconds to re-enter LPI mode.
Beside, tx_lpi_timer can be used to optimize EEE for some applications.
For example do not start Low Power Idle for some usecs so latency will
be reduced. Are there some secret register to configure this value?
Regards,
Oleksij
--
Pengutronix e.K. | |
Steuerwalder Str. 21 | http://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
Hi Oleksij,
On Thu, 2023-02-09 at 06:48 +0100, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
>
> Hi Arun,
>
> On Thu, Feb 09, 2023 at 04:07:11AM +0000, [email protected]
> wrote:
> > Hi Oleksij,
> > On Wed, 2023-02-08 at 11:32 +0100, Oleksij Rempel wrote:
> > > EXTERNAL EMAIL: Do not click links or open attachments unless you
> > > know the content is safe
> > >
> > > Some of KSZ9477 family switches provides EEE support.
> >
> > nit: If you can elaborate what are the chip supports will be good.
>
> Do you mean list of supported chips or link speeds with EEE support?
Yes, since you mentioned some of KSZ9477, I thought it will be better
to mention the supported chips in commit description.
>
> > > To enable it, we
> > > just need to register set_mac_eee/set_mac_eee handlers and
> > > validate
> > > supported chip version and port.
> > >
> > > Signed-off-by: Oleksij Rempel <[email protected]>
> > > Reviewed-by: Andrew Lunn <[email protected]>
> > > ---
> > > drivers/net/dsa/microchip/ksz_common.c | 65
> > > ++++++++++++++++++++++++++
> > > 1 file changed, 65 insertions(+)
> > >
> > > diff --git a/drivers/net/dsa/microchip/ksz_common.c
> > > b/drivers/net/dsa/microchip/ksz_common.c
> > > index 46becc0382d6..0a2d78253d17 100644
> > > --- a/drivers/net/dsa/microchip/ksz_common.c
> > > +++ b/drivers/net/dsa/microchip/ksz_common.c
> > > @@ -2673,6 +2673,69 @@ static int ksz_max_mtu(struct dsa_switch
> > > *ds,
> > > int port)
> > > return -EOPNOTSUPP;
> > > }
> > >
> > > +static int ksz_get_mac_eee(struct dsa_switch *ds, int port,
> > > + struct ethtool_eee *e)
> > > +{
> > > + int ret;
> > > +
> > > + ret = ksz_validate_eee(ds, port);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + /* There is no documented control of Tx LPI
> > > configuration. */
> > > + e->tx_lpi_enabled = true;
> >
> > Blank line before comment will increase readability.
> >
> > > + /* There is no documented control of Tx LPI timer.
> > > According
> > > to tests
> > > + * Tx LPI timer seems to be set by default to minimal
> > > value.
> > > + */
> > > + e->tx_lpi_timer = 0;
> >
> > for lpi_enabled, you have used true and for lpi_timer you have used
> > 0.
> > It can be consistent either true/false or 1/0.
>
> tx_lpi_enabled has only on/off states. This is why i use bool values.
>
> tx_lpi_timer is a range in microseconds to re-enter LPI mode.
Got it. I overlooked the variable data type.
>
> Beside, tx_lpi_timer can be used to optimize EEE for some
> applications.
> For example do not start Low Power Idle for some usecs so latency
> will
> be reduced. Are there some secret register to configure this value?
I am not aware of it.
>
> Regards,
> Oleksij
> --
> Pengutronix
> e.K. | |
> Steuerwalder Str. 21 |
> http://www.pengutronix.de/e/ |
> 31137 Hildesheim, Germany | Phone: +49-5121-206917-
> 0 |
> Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-
> 5555 |