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[PATCH net-next v3 4/8] net: dsa: vsc73xx: add port_stp_state_set function

Pawel Dembicki posted 8 patches 2 years, 3 months ago
There is a newer version of this series
[PATCH net-next v3 4/8] net: dsa: vsc73xx: add port_stp_state_set function
Posted by Pawel Dembicki 2 years, 3 months ago 
This isn't a fully functional implementation of 802.1D, but
port_stp_state_set is required for a future tag8021q operations.

This implementation handles properly all states, but vsc73xx doesn't
forward STP packets.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
---
v3:
  - use 'VSC73XX_MAX_NUM_PORTS' define
  - add 'state == BR_STATE_DISABLED' condition
  - fix style issues
v2:
  - fix kdoc

 drivers/net/dsa/vitesse-vsc73xx-core.c | 61 +++++++++++++++++++++++---
 drivers/net/dsa/vitesse-vsc73xx.h      |  2 +
 2 files changed, 57 insertions(+), 6 deletions(-)

diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
index 8f2285a03e82..541fbc195df1 100644
--- a/drivers/net/dsa/vitesse-vsc73xx-core.c
+++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
@@ -163,6 +163,10 @@
 #define VSC73XX_AGENCTRL	0xf0
 #define VSC73XX_CAPRST		0xff
 
+#define VSC73XX_SRCMASKS_CPU_COPY		BIT(27)
+#define VSC73XX_SRCMASKS_MIRROR			BIT(26)
+#define VSC73XX_SRCMASKS_PORTS_MASK		GENMASK(7, 0)
+
 #define VSC73XX_MACACCESS_CPU_COPY		BIT(14)
 #define VSC73XX_MACACCESS_FWD_KILL		BIT(13)
 #define VSC73XX_MACACCESS_IGNORE_VLAN		BIT(12)
@@ -619,9 +623,6 @@ static int vsc73xx_setup(struct dsa_switch *ds)
 	vsc73xx_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_GMIIDELAY,
 		      VSC73XX_GMIIDELAY_GMII0_GTXDELAY_2_0_NS |
 		      VSC73XX_GMIIDELAY_GMII0_RXDELAY_2_0_NS);
-	/* Enable reception of frames on all ports */
-	vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_RECVMASK,
-		      0x5f);
 	/* IP multicast flood mask (table 144) */
 	vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_IFLODMSK,
 		      0xff);
@@ -864,9 +865,6 @@ static void vsc73xx_phylink_mac_link_up(struct dsa_switch *ds, int port,
 	if (duplex == DUPLEX_FULL)
 		val |= VSC73XX_MAC_CFG_FDX;
 
-	/* Enable port (forwarding) in the receieve mask */
-	vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
-			    VSC73XX_RECVMASK, BIT(port), BIT(port));
 	vsc73xx_adjust_enable_port(vsc, port, val);
 }
 
@@ -1033,9 +1031,59 @@ static int vsc73xx_get_max_mtu(struct dsa_switch *ds, int port)
 	return 9600 - ETH_HLEN - ETH_FCS_LEN;
 }
 
+static int vsc73xx_port_setup(struct dsa_switch *ds, int port)
+{
+	/* Configure forward map to CPU <-> port only */
+	if (port == CPU_PORT)
+		vsc->forward_map[CPU_PORT] = VSC73XX_SRCMASKS_PORTS_MASK &
+					     ~BIT(CPU_PORT);
+	else
+		vsc->forward_map[port] = VSC73XX_SRCMASKS_PORTS_MASK &
+					 BIT(CPU_PORT);
+
+	return 0;
+}
+
+/* FIXME: STP frames aren't forwarded at this moment. BPDU frames are
+ * forwarded only from and to PI/SI interface. For more info see chapter
+ * 2.7.1 (CPU Forwarding) in datasheet.
+ * This function is required for tag8021q operations.
+ */
+
+static void vsc73xx_port_stp_state_set(struct dsa_switch *ds, int port,
+				       u8 state)
+{
+	struct vsc73xx *vsc = ds->priv;
+
+	if (state == BR_STATE_BLOCKING || state == BR_STATE_DISABLED)
+		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+				    VSC73XX_RECVMASK, BIT(port), 0);
+	else
+		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+				    VSC73XX_RECVMASK, BIT(port), BIT(port));
+
+	if (state == BR_STATE_LEARNING || state == BR_STATE_FORWARDING)
+		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+				    VSC73XX_LEARNMASK, BIT(port), BIT(port));
+	else
+		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+				    VSC73XX_LEARNMASK, BIT(port), 0);
+
+	if (state == BR_STATE_FORWARDING)
+		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+				    VSC73XX_SRCMASKS + port,
+				    VSC73XX_SRCMASKS_PORTS_MASK,
+				    vsc->forward_map[port]);
+	else
+		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+				    VSC73XX_SRCMASKS + port,
+				    VSC73XX_SRCMASKS_PORTS_MASK, 0);
+}
+
 static const struct dsa_switch_ops vsc73xx_ds_ops = {
 	.get_tag_protocol = vsc73xx_get_tag_protocol,
 	.setup = vsc73xx_setup,
+	.port_setup = vsc73xx_port_setup,
 	.phy_read = vsc73xx_phy_read,
 	.phy_write = vsc73xx_phy_write,
 	.phylink_get_caps = vsc73xx_phylink_get_caps,
@@ -1049,6 +1097,7 @@ static const struct dsa_switch_ops vsc73xx_ds_ops = {
 	.port_disable = vsc73xx_port_disable,
 	.port_change_mtu = vsc73xx_change_mtu,
 	.port_max_mtu = vsc73xx_get_max_mtu,
+	.port_stp_state_set = vsc73xx_port_stp_state_set,
 };
 
 static int vsc73xx_gpio_get(struct gpio_chip *chip, unsigned int offset)
diff --git a/drivers/net/dsa/vitesse-vsc73xx.h b/drivers/net/dsa/vitesse-vsc73xx.h
index f79d81ef24fb..224e284a5573 100644
--- a/drivers/net/dsa/vitesse-vsc73xx.h
+++ b/drivers/net/dsa/vitesse-vsc73xx.h
@@ -18,6 +18,7 @@
 
 /**
  * struct vsc73xx - VSC73xx state container
+ * @forward_map: Forward table cache
  */
 struct vsc73xx {
 	struct device			*dev;
@@ -28,6 +29,7 @@ struct vsc73xx {
 	u8				addr[ETH_ALEN];
 	const struct vsc73xx_ops	*ops;
 	void				*priv;
+	u8				forward_map[VSC73XX_MAX_NUM_PORTS];
 };
 
 struct vsc73xx_ops {
-- 
2.34.1
Re: [PATCH net-next v3 4/8] net: dsa: vsc73xx: add port_stp_state_set function
Posted by Vladimir Oltean 2 years, 3 months ago 
Hi Pawel,

On Tue, Sep 12, 2023 at 02:21:58PM +0200, Pawel Dembicki wrote:
> This isn't a fully functional implementation of 802.1D, but
> port_stp_state_set is required for a future tag8021q operations.
> 
> This implementation handles properly all states, but vsc73xx doesn't
> forward STP packets.
> 
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
> ---
> diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
> index 8f2285a03e82..541fbc195df1 100644
> --- a/drivers/net/dsa/vitesse-vsc73xx-core.c
> +++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
> @@ -1033,9 +1031,59 @@ static int vsc73xx_get_max_mtu(struct dsa_switch *ds, int port)
>  	return 9600 - ETH_HLEN - ETH_FCS_LEN;
>  }
>  
> +static int vsc73xx_port_setup(struct dsa_switch *ds, int port)
> +{

For bisectability, the series must build patch by patch.
Here, you are missing:

	struct vsc73xx *vsc = ds->priv;

../drivers/net/dsa/vitesse-vsc73xx-core.c:1038:3: error: use of undeclared identifier 'vsc'
                vsc->forward_map[CPU_PORT] = VSC73XX_SRCMASKS_PORTS_MASK &
                ^
../drivers/net/dsa/vitesse-vsc73xx-core.c:1041:3: error: use of undeclared identifier 'vsc'
                vsc->forward_map[port] = VSC73XX_SRCMASKS_PORTS_MASK &
                ^
2 errors generated.

> +	/* Configure forward map to CPU <-> port only */
> +	if (port == CPU_PORT)
> +		vsc->forward_map[CPU_PORT] = VSC73XX_SRCMASKS_PORTS_MASK &
> +					     ~BIT(CPU_PORT);

		vsc->forward_map[CPU_PORT] = dsa_user_ports(ds);

> +	else
> +		vsc->forward_map[port] = VSC73XX_SRCMASKS_PORTS_MASK &
> +					 BIT(CPU_PORT);

		vsc->forward_map[port] = BIT(CPU_PORT);

> +
> +	return 0;
> +}
> +
> +/* FIXME: STP frames aren't forwarded at this moment. BPDU frames are
> + * forwarded only from and to PI/SI interface. For more info see chapter
> + * 2.7.1 (CPU Forwarding) in datasheet.
> + * This function is required for tag8021q operations.
> + */
> +
> +static void vsc73xx_port_stp_state_set(struct dsa_switch *ds, int port,
> +				       u8 state)
> +{
> +	struct vsc73xx *vsc = ds->priv;
> +
> +	if (state == BR_STATE_BLOCKING || state == BR_STATE_DISABLED)
> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_RECVMASK, BIT(port), 0);
> +	else
> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_RECVMASK, BIT(port), BIT(port));
> +
> +	if (state == BR_STATE_LEARNING || state == BR_STATE_FORWARDING)
> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_LEARNMASK, BIT(port), BIT(port));
> +	else
> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_LEARNMASK, BIT(port), 0);
> +
> +	if (state == BR_STATE_FORWARDING)
> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_SRCMASKS + port,
> +				    VSC73XX_SRCMASKS_PORTS_MASK,
> +				    vsc->forward_map[port]);

To forward a packet between port A and port B, both of them must be in
BR_STATE_FORWARDING, not just A.

> +	else
> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_SRCMASKS + port,
> +				    VSC73XX_SRCMASKS_PORTS_MASK, 0);
> +}
> +
>  static const struct dsa_switch_ops vsc73xx_ds_ops = {
>  	.get_tag_protocol = vsc73xx_get_tag_protocol,
>  	.setup = vsc73xx_setup,
> +	.port_setup = vsc73xx_port_setup,
>  	.phy_read = vsc73xx_phy_read,
>  	.phy_write = vsc73xx_phy_write,
>  	.phylink_get_caps = vsc73xx_phylink_get_caps,
> @@ -1049,6 +1097,7 @@ static const struct dsa_switch_ops vsc73xx_ds_ops = {
>  	.port_disable = vsc73xx_port_disable,
>  	.port_change_mtu = vsc73xx_change_mtu,
>  	.port_max_mtu = vsc73xx_get_max_mtu,
> +	.port_stp_state_set = vsc73xx_port_stp_state_set,
>  };
>  
>  static int vsc73xx_gpio_get(struct gpio_chip *chip, unsigned int offset)
> diff --git a/drivers/net/dsa/vitesse-vsc73xx.h b/drivers/net/dsa/vitesse-vsc73xx.h
> index f79d81ef24fb..224e284a5573 100644
> --- a/drivers/net/dsa/vitesse-vsc73xx.h
> +++ b/drivers/net/dsa/vitesse-vsc73xx.h
> @@ -18,6 +18,7 @@
>  
>  /**
>   * struct vsc73xx - VSC73xx state container
> + * @forward_map: Forward table cache

If you start describing the member fields, shouldn't all be described?
I think there will be kdoc warnings otherwise.

>   */
>  struct vsc73xx {
>  	struct device			*dev;
> @@ -28,6 +29,7 @@ struct vsc73xx {
>  	u8				addr[ETH_ALEN];
>  	const struct vsc73xx_ops	*ops;
>  	void				*priv;
> +	u8				forward_map[VSC73XX_MAX_NUM_PORTS];
>  };
>  
>  struct vsc73xx_ops {
> -- 
> 2.34.1
>
Re: [PATCH net-next v3 4/8] net: dsa: vsc73xx: add port_stp_state_set function
Posted by Paweł Dembicki 2 years, 3 months ago 
wt., 12 wrz 2023 o 16:48 Vladimir Oltean <olteanv@gmail.com> napisał(a):
>
> Hi Pawel,
>
Hi Vladimir,

Thank you for Your time.

> On Tue, Sep 12, 2023 at 02:21:58PM +0200, Pawel Dembicki wrote:
> > This isn't a fully functional implementation of 802.1D, but
> > port_stp_state_set is required for a future tag8021q operations.
> >
> > This implementation handles properly all states, but vsc73xx doesn't
> > forward STP packets.
> >
> > Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> > Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
> > ---
> > diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
> > index 8f2285a03e82..541fbc195df1 100644
> > --- a/drivers/net/dsa/vitesse-vsc73xx-core.c
> > +++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
> > @@ -1033,9 +1031,59 @@ static int vsc73xx_get_max_mtu(struct dsa_switch *ds, int port)
> >       return 9600 - ETH_HLEN - ETH_FCS_LEN;
> >  }
> >
> > +static int vsc73xx_port_setup(struct dsa_switch *ds, int port)
> > +{
>
> For bisectability, the series must build patch by patch.
> Here, you are missing:
>
>         struct vsc73xx *vsc = ds->priv;
>
> ../drivers/net/dsa/vitesse-vsc73xx-core.c:1038:3: error: use of undeclared identifier 'vsc'
>                 vsc->forward_map[CPU_PORT] = VSC73XX_SRCMASKS_PORTS_MASK &
>                 ^
> ../drivers/net/dsa/vitesse-vsc73xx-core.c:1041:3: error: use of undeclared identifier 'vsc'
>                 vsc->forward_map[port] = VSC73XX_SRCMASKS_PORTS_MASK &
>                 ^
> 2 errors generated.
>
> > +     /* Configure forward map to CPU <-> port only */
> > +     if (port == CPU_PORT)
> > +             vsc->forward_map[CPU_PORT] = VSC73XX_SRCMASKS_PORTS_MASK &
> > +                                          ~BIT(CPU_PORT);
>
>                 vsc->forward_map[CPU_PORT] = dsa_user_ports(ds);
>
> > +     else
> > +             vsc->forward_map[port] = VSC73XX_SRCMASKS_PORTS_MASK &
> > +                                      BIT(CPU_PORT);
>
>                 vsc->forward_map[port] = BIT(CPU_PORT);
>
> > +
> > +     return 0;
> > +}
> > +
> > +/* FIXME: STP frames aren't forwarded at this moment. BPDU frames are
> > + * forwarded only from and to PI/SI interface. For more info see chapter
> > + * 2.7.1 (CPU Forwarding) in datasheet.
> > + * This function is required for tag8021q operations.
> > + */
> > +
> > +static void vsc73xx_port_stp_state_set(struct dsa_switch *ds, int port,
> > +                                    u8 state)
> > +{
> > +     struct vsc73xx *vsc = ds->priv;
> > +
> > +     if (state == BR_STATE_BLOCKING || state == BR_STATE_DISABLED)
> > +             vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> > +                                 VSC73XX_RECVMASK, BIT(port), 0);
> > +     else
> > +             vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> > +                                 VSC73XX_RECVMASK, BIT(port), BIT(port));
> > +
> > +     if (state == BR_STATE_LEARNING || state == BR_STATE_FORWARDING)
> > +             vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> > +                                 VSC73XX_LEARNMASK, BIT(port), BIT(port));
> > +     else
> > +             vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> > +                                 VSC73XX_LEARNMASK, BIT(port), 0);
> > +
> > +     if (state == BR_STATE_FORWARDING)
> > +             vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> > +                                 VSC73XX_SRCMASKS + port,
> > +                                 VSC73XX_SRCMASKS_PORTS_MASK,
> > +                                 vsc->forward_map[port]);
>
> To forward a packet between port A and port B, both of them must be in
> BR_STATE_FORWARDING, not just A.
>

In this patch bridges are unimplemented. Please look at 8/8 patch [0].

> > +     else
> > +             vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> > +                                 VSC73XX_SRCMASKS + port,
> > +                                 VSC73XX_SRCMASKS_PORTS_MASK, 0);
> > +}
> > +
> >  static const struct dsa_switch_ops vsc73xx_ds_ops = {
> >       .get_tag_protocol = vsc73xx_get_tag_protocol,
> >       .setup = vsc73xx_setup,
> > +     .port_setup = vsc73xx_port_setup,
> >       .phy_read = vsc73xx_phy_read,
> >       .phy_write = vsc73xx_phy_write,
> >       .phylink_get_caps = vsc73xx_phylink_get_caps,
> > @@ -1049,6 +1097,7 @@ static const struct dsa_switch_ops vsc73xx_ds_ops = {
> >       .port_disable = vsc73xx_port_disable,
> >       .port_change_mtu = vsc73xx_change_mtu,
> >       .port_max_mtu = vsc73xx_get_max_mtu,
> > +     .port_stp_state_set = vsc73xx_port_stp_state_set,
> >  };
> >
> >  static int vsc73xx_gpio_get(struct gpio_chip *chip, unsigned int offset)
> > diff --git a/drivers/net/dsa/vitesse-vsc73xx.h b/drivers/net/dsa/vitesse-vsc73xx.h
> > index f79d81ef24fb..224e284a5573 100644
> > --- a/drivers/net/dsa/vitesse-vsc73xx.h
> > +++ b/drivers/net/dsa/vitesse-vsc73xx.h
> > @@ -18,6 +18,7 @@
> >
> >  /**
> >   * struct vsc73xx - VSC73xx state container
> > + * @forward_map: Forward table cache
>
> If you start describing the member fields, shouldn't all be described?
> I think there will be kdoc warnings otherwise.
>

Jakub in v1 series points kdoc warn in this case. I added a
description to the field added by me. Should I prepare in the v4
series a separate commit for other descriptions in this struct?

> >   */
> >  struct vsc73xx {
> >       struct device                   *dev;
> > @@ -28,6 +29,7 @@ struct vsc73xx {
> >       u8                              addr[ETH_ALEN];
> >       const struct vsc73xx_ops        *ops;
> >       void                            *priv;
> > +     u8                              forward_map[VSC73XX_MAX_NUM_PORTS];
> >  };
> >
> >  struct vsc73xx_ops {
> > --
> > 2.34.1
> >

[0] https://lore.kernel.org/netdev/20230912122201.3752918-9-paweldembicki@gmail.com/T/#u
Re: [PATCH net-next v3 4/8] net: dsa: vsc73xx: add port_stp_state_set function
Posted by Vladimir Oltean 2 years, 3 months ago 
On Tue, Sep 12, 2023 at 05:27:45PM +0200, Paweł Dembicki wrote:
> > To forward a packet between port A and port B, both of them must be in
> > BR_STATE_FORWARDING, not just A.
> >
> 
> In this patch bridges are unimplemented. Please look at 8/8 patch [0].
> 
> [0] https://lore.kernel.org/netdev/20230912122201.3752918-9-paweldembicki@gmail.com/T/#u

Yes, but vsc73xx_port_stp_state_set() remains unchanged until the end.
What am I missing? In your implementation, nothing prevents port i
(which is in BR_STATE_FORWARDING) from forwarding packets towards a port j,
present in vsc->forward_map[i] & BIT(j), which is *not* in BR_STATE_FORWARDING.
If you don't have access to the STP protocol yet, you can put port j
down and it will go to the DISABLED state and you can confirm that other
ports in the bridge will still remain configured to forward to it.

> > > diff --git a/drivers/net/dsa/vitesse-vsc73xx.h b/drivers/net/dsa/vitesse-vsc73xx.h
> > > index f79d81ef24fb..224e284a5573 100644
> > > --- a/drivers/net/dsa/vitesse-vsc73xx.h
> > > +++ b/drivers/net/dsa/vitesse-vsc73xx.h
> > > @@ -18,6 +18,7 @@
> > >
> > >  /**
> > >   * struct vsc73xx - VSC73xx state container
> > > + * @forward_map: Forward table cache
> >
> > If you start describing the member fields, shouldn't all be described?
> > I think there will be kdoc warnings otherwise.
> >
> 
> Jakub in v1 series points kdoc warn in this case. I added a
> description to the field added by me. Should I prepare in the v4
> series a separate commit for other descriptions in this struct?

Yes, but please hold off posting it until I'm done reviewing this version.

Patchew 2.1-devel-b67e4c2

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