If the master device does VLAN filtering, the IDs used by the switch
must be added for any frames to be received.  Do this in the
port_enable() function, and remove them in port_disable().

Signed-off-by: Mans Rullgard <mans@mansr.com>
---
Changes:
- Fix dependency on VLAN_8021Q
- Add missing #include
---
 drivers/net/dsa/Kconfig        |  1 +
 drivers/net/dsa/lan9303-core.c | 11 +++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/Kconfig b/drivers/net/dsa/Kconfig
index 8d51c1019dcd..37a3dabdce31 100644
--- a/drivers/net/dsa/Kconfig
+++ b/drivers/net/dsa/Kconfig
@@ -72,6 +72,7 @@ source "drivers/net/dsa/realtek/Kconfig"
 
 config NET_DSA_SMSC_LAN9303
 	tristate
+	depends on VLAN_8021Q || VLAN_8021Q=n
 	select NET_DSA_TAG_LAN9303
 	select REGMAP
 	help
diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index 873a5588171b..3969d89fa4db 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -10,6 +10,7 @@
 #include <linux/mii.h>
 #include <linux/phy.h>
 #include <linux/if_bridge.h>
+#include <linux/if_vlan.h>
 #include <linux/etherdevice.h>
 
 #include "lan9303.h"
@@ -1083,21 +1084,27 @@ static void lan9303_adjust_link(struct dsa_switch *ds, int port,
 static int lan9303_port_enable(struct dsa_switch *ds, int port,
 			       struct phy_device *phy)
 {
+	struct dsa_port *dp = dsa_to_port(ds, port);
 	struct lan9303 *chip = ds->priv;
 
-	if (!dsa_is_user_port(ds, port))
+	if (!dsa_port_is_user(dp))
 		return 0;
 
+	vlan_vid_add(dp->cpu_dp->master, htons(ETH_P_8021Q), port);
+
 	return lan9303_enable_processing_port(chip, port);
 }
 
 static void lan9303_port_disable(struct dsa_switch *ds, int port)
 {
+	struct dsa_port *dp = dsa_to_port(ds, port);
 	struct lan9303 *chip = ds->priv;
 
-	if (!dsa_is_user_port(ds, port))
+	if (!dsa_port_is_user(dp))
 		return;
 
+	vlan_vid_del(dp->cpu_dp->master, htons(ETH_P_8021Q), port);
+
 	lan9303_disable_processing_port(chip, port);
 	lan9303_phy_write(ds, chip->phy_addr_base + port, MII_BMCR, BMCR_PDOWN);
 }
-- 
2.35.1

On Wed, Feb 16, 2022 at 08:48:18PM +0000, Mans Rullgard wrote:
> If the master device does VLAN filtering, the IDs used by the switch
> must be added for any frames to be received.  Do this in the
> port_enable() function, and remove them in port_disable().
> 
> Signed-off-by: Mans Rullgard <mans@mansr.com>
> ---

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>

On Thu, Feb 17, 2022 at 01:59:30AM +0200, Vladimir Oltean wrote:
> On Wed, Feb 16, 2022 at 08:48:18PM +0000, Mans Rullgard wrote:
> > If the master device does VLAN filtering, the IDs used by the switch
> > must be added for any frames to be received.  Do this in the
> > port_enable() function, and remove them in port_disable().
> > 
> > Signed-off-by: Mans Rullgard <mans@mansr.com>
> > ---
> 
> Reviewed-by: Vladimir Oltean <olteanv@gmail.com>

There's a problem with this patch.

CONFIG_NET_DSA_SMSC_LAN9303 is not user-selectable, but it is selected
by CONFIG_NET_DSA_SMSC_LAN9303_I2C or CONFIG_NET_DSA_SMSC_LAN9303_MDIO.
The point is that config options that aren't user-selectable but are
automatically selected shouldn't have dependencies. AFAIK, the
dependencies should be transferred to the user-facing options
(_I2C and _MDIO).

What happens is that if you make CONFIG_VLAN_8021Q a module, you get
this warning:

WARNING: unmet direct dependencies detected for NET_DSA_SMSC_LAN9303
  Depends on [m]: NETDEVICES [=y] && NET_DSA [=y] && (VLAN_8021Q [=m] || VLAN_8021Q [=m]=n)
  Selected by [y]:
  - NET_DSA_SMSC_LAN9303_I2C [=y] && NETDEVICES [=y] && NET_DSA [=y] && I2C [=y]
  - NET_DSA_SMSC_LAN9303_MDIO [=y] && NETDEVICES [=y] && NET_DSA [=y]

The point of the dependency was to force the LAN9303 driver as a module
if 8021Q is a module, but this doesn't happen because the dependency
isn't where it should be.

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 16 Feb 2022 20:48:18 +0000 you wrote:
> If the master device does VLAN filtering, the IDs used by the switch
> must be added for any frames to be received.  Do this in the
> port_enable() function, and remove them in port_disable().
> 
> Signed-off-by: Mans Rullgard <mans@mansr.com>
> ---
> Changes:
> - Fix dependency on VLAN_8021Q
> - Add missing #include
> 
> [...]

Here is the summary with links:
  - [v2] net: dsa: lan9303: add VLAN IDs to master device
    https://git.kernel.org/netdev/net/c/430065e26719

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

On 2/16/22 12:48 PM, Mans Rullgard wrote:
> If the master device does VLAN filtering, the IDs used by the switch
> must be added for any frames to be received.  Do this in the
> port_enable() function, and remove them in port_disable().
> 
> Signed-off-by: Mans Rullgard <mans@mansr.com>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

Should this have :

Fixes: a1292595e006 ("net: dsa: add new DSA switch driver for the
SMSC-LAN9303")
-- 
Florian