[PATCH net v2 0/2] MT7530 DSA subdriver fix VLAN egress and handling of all link-local frames

[PATCH net v2 0/2] MT7530 DSA subdriver fix VLAN egress and handling of all link-local frames

[Arınç ÜNAL via B4 Relay]

Hi.

This patch series fixes the VLAN tag egress procedure for link-local
frames, and fixes handling of all link-local frames.

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
---
Changes in v2:
- Add Fixes: tag to both patches.
- Link to v1: https://lore.kernel.org/r/20240311-b4-for-net-mt7530-fix-link-local-vlan-v1-0-d67e6cc31af2@arinc9.com

---
Arınç ÜNAL (2):
      net: dsa: mt7530: fix link-local frames that ingress vlan filtering ports
      net: dsa: mt7530: fix handling of all link-local frames

 drivers/net/dsa/mt7530.c | 52 ++++++++++++++++++++++++++++++++++++++++--------
 drivers/net/dsa/mt7530.h | 22 +++++++++++++++++++-
 2 files changed, 65 insertions(+), 9 deletions(-)
---
base-commit: d7d75124965aee23e5e4421d78376545cf070b0a
change-id: 20240208-b4-for-net-mt7530-fix-link-local-vlan-af6e9928ad8d

Best regards,
-- 
Arınç ÜNAL <arinc.unal@arinc9.com>


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[PATCH net v2 1/2] net: dsa: mt7530: fix link-local frames that ingress vlan filtering ports

[Arınç ÜNAL via B4 Relay]

From: Arınç ÜNAL <arinc.unal@arinc9.com>

Whether VLAN-aware or not, on every VID VLAN table entry that has the CPU
port as a member of it, frames are set to egress the CPU port with the VLAN
tag stacked. This is so that VLAN tags can be appended after hardware
special tag (called DSA tag in the context of Linux drivers).

For user ports on a VLAN-unaware bridge, frame ingressing the user port
egresses CPU port with only the special tag.

For user ports on a VLAN-aware bridge, frame ingressing the user port
egresses CPU port with the special tag and the VLAN tag.

This causes issues with link-local frames, specifically BPDUs, because the
software expects to receive them VLAN-untagged.

There are two options to make link-local frames egress untagged. Setting
CONSISTENT or UNTAGGED on the EG_TAG bits on the relevant register.
CONSISTENT means frames egress exactly as they ingress. That means
egressing with the VLAN tag they had at ingress or egressing untagged if
they ingressed untagged. Although link-local frames are not supposed to be
transmitted VLAN-tagged, if they are done so, when egressing through a CPU
port, the special tag field will be broken.

BPDU egresses CPU port with VLAN tag egressing stacked, received on
software:

00:01:25.104821 AF Unknown (382365846), length 106:
                                     | STAG  | | VLAN  |
        0x0000:  0000 6c27 614d 4143 0001 0000 8100 0001  ..l'aMAC........
        0x0010:  0026 4242 0300 0000 0000 0000 6c27 614d  .&BB........l'aM
        0x0020:  4143 0000 0000 0000 6c27 614d 4143 0000  AC......l'aMAC..
        0x0030:  0000 1400 0200 0f00 0000 0000 0000 0000  ................

BPDU egresses CPU port with VLAN tag egressing untagged, received on
software:

00:23:56.628708 AF Unknown (25215488), length 64:
                                     | STAG  |
        0x0000:  0000 6c27 614d 4143 0001 0000 0026 4242  ..l'aMAC.....&BB
        0x0010:  0300 0000 0000 0000 6c27 614d 4143 0000  ........l'aMAC..
        0x0020:  0000 0000 6c27 614d 4143 0000 0000 1400  ....l'aMAC......
        0x0030:  0200 0f00 0000 0000 0000 0000            ............

BPDU egresses CPU port with VLAN tag egressing tagged, received on
software:

00:01:34.311963 AF Unknown (25215488), length 64:
                                     | Mess  |
        0x0000:  0000 6c27 614d 4143 0001 0001 0026 4242  ..l'aMAC.....&BB
        0x0010:  0300 0000 0000 0000 6c27 614d 4143 0000  ........l'aMAC..
        0x0020:  0000 0000 6c27 614d 4143 0000 0000 1400  ....l'aMAC......
        0x0030:  0200 0f00 0000 0000 0000 0000            ............

To prevent confusing the software, force the frame to egress UNTAGGED
instead of CONSISTENT. This way, frames can't possibly be received TAGGED
by software which would have the special tag field broken.

VLAN Tag Egress Procedure

   For all frames, one of these options set the earliest in this order will
   apply to the frame:

   - EG_TAG in certain registers for certain frames.
     This will apply to frame with matching MAC DA or EtherType.

   - EG_TAG in the address table.
     This will apply to frame at its incoming port.

   - EG_TAG in the PVC register.
     This will apply to frame at its incoming port.

   - EG_CON and [EG_TAG per port] in the VLAN table.
     This will apply to frame at its outgoing port.

   - EG_TAG in the PCR register.
     This will apply to frame at its outgoing port.

   EG_TAG in certain registers for certain frames:

   PPPoE Discovery_ARP/RARP: PPP_EG_TAG and ARP_EG_TAG in the APC register.
   IGMP_MLD: IGMP_EG_TAG and MLD_EG_TAG in the IMC register.
   BPDU and PAE: BPDU_EG_TAG and PAE_EG_TAG in the BPC register.
   REV_01 and REV_02: R01_EG_TAG and R02_EG_TAG in the RGAC1 register.
   REV_03 and REV_0E: R03_EG_TAG and R0E_EG_TAG in the RGAC2 register.
   REV_10 and REV_20: R10_EG_TAG and R20_EG_TAG in the RGAC3 register.
   REV_21 and REV_UN: R21_EG_TAG and RUN_EG_TAG in the RGAC4 register.

With this change, it can be observed that a bridge interface with stp_state
and vlan_filtering enabled will properly block ports now.

Fixes: b8f126a8d543 ("net-next: dsa: add dsa support for Mediatek MT7530 switch")
Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
---
 drivers/net/dsa/mt7530.c | 23 +++++++++++++++--------
 drivers/net/dsa/mt7530.h |  9 ++++++++-
 2 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 678b51f9cea6..ac887e929c79 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -953,16 +953,23 @@ static void mt7530_setup_port5(struct dsa_switch *ds, phy_interface_t interface)
 static void
 mt753x_trap_frames(struct mt7530_priv *priv)
 {
-	/* Trap BPDUs to the CPU port(s) */
-	mt7530_rmw(priv, MT753X_BPC, MT753X_BPDU_PORT_FW_MASK,
+	/* Trap 802.1X PAE frames and BPDUs to the CPU port(s) and egress them
+	 * VLAN-untagged.
+	 */
+	mt7530_rmw(priv, MT753X_BPC, MT753X_PAE_EG_TAG_MASK |
+		   MT753X_PAE_PORT_FW_MASK | MT753X_BPDU_EG_TAG_MASK |
+		   MT753X_BPDU_PORT_FW_MASK,
+		   MT753X_PAE_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
+		   MT753X_PAE_PORT_FW(MT753X_BPDU_CPU_ONLY) |
+		   MT753X_BPDU_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
 		   MT753X_BPDU_CPU_ONLY);
 
-	/* Trap 802.1X PAE frames to the CPU port(s) */
-	mt7530_rmw(priv, MT753X_BPC, MT753X_PAE_PORT_FW_MASK,
-		   MT753X_PAE_PORT_FW(MT753X_BPDU_CPU_ONLY));
-
-	/* Trap LLDP frames with :0E MAC DA to the CPU port(s) */
-	mt7530_rmw(priv, MT753X_RGAC2, MT753X_R0E_PORT_FW_MASK,
+	/* Trap LLDP frames with :0E MAC DA to the CPU port(s) and egress them
+	 * VLAN-untagged.
+	 */
+	mt7530_rmw(priv, MT753X_RGAC2, MT753X_R0E_EG_TAG_MASK |
+		   MT753X_R0E_PORT_FW_MASK,
+		   MT753X_R0E_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
 		   MT753X_R0E_PORT_FW(MT753X_BPDU_CPU_ONLY));
 }
 
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index a71166e0a7fc..5566c905a415 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -65,12 +65,18 @@ enum mt753x_id {
 
 /* Registers for BPDU and PAE frame control*/
 #define MT753X_BPC			0x24
-#define  MT753X_BPDU_PORT_FW_MASK	GENMASK(2, 0)
+#define  MT753X_PAE_EG_TAG_MASK		GENMASK(24, 22)
+#define  MT753X_PAE_EG_TAG(x)		FIELD_PREP(MT753X_PAE_EG_TAG_MASK, x)
 #define  MT753X_PAE_PORT_FW_MASK	GENMASK(18, 16)
 #define  MT753X_PAE_PORT_FW(x)		FIELD_PREP(MT753X_PAE_PORT_FW_MASK, x)
+#define  MT753X_BPDU_EG_TAG_MASK	GENMASK(8, 6)
+#define  MT753X_BPDU_EG_TAG(x)		FIELD_PREP(MT753X_BPDU_EG_TAG_MASK, x)
+#define  MT753X_BPDU_PORT_FW_MASK	GENMASK(2, 0)
 
 /* Register for :03 and :0E MAC DA frame control */
 #define MT753X_RGAC2			0x2c
+#define  MT753X_R0E_EG_TAG_MASK		GENMASK(24, 22)
+#define  MT753X_R0E_EG_TAG(x)		FIELD_PREP(MT753X_R0E_EG_TAG_MASK, x)
 #define  MT753X_R0E_PORT_FW_MASK	GENMASK(18, 16)
 #define  MT753X_R0E_PORT_FW(x)		FIELD_PREP(MT753X_R0E_PORT_FW_MASK, x)
 
@@ -253,6 +259,7 @@ enum mt7530_port_mode {
 enum mt7530_vlan_port_eg_tag {
 	MT7530_VLAN_EG_DISABLED = 0,
 	MT7530_VLAN_EG_CONSISTENT = 1,
+	MT7530_VLAN_EG_UNTAGGED = 4,
 };
 
 enum mt7530_vlan_port_attr {

-- 
2.40.1


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[PATCH net v2 2/2] net: dsa: mt7530: fix handling of all link-local frames

[Arınç ÜNAL via B4 Relay]

From: Arınç ÜNAL <arinc.unal@arinc9.com>

Currently, the MT753X switches treat frames with :01-0D and :0F MAC DAs as
regular multicast frames, therefore flooding them to user ports.

On page 205, section "8.6.3 Frame filtering" of the active standard, IEEE
Std 802.1Q™-2022, it is stated that frames with 01:80:C2:00:00:00-0F as MAC
DA must only be propagated to C-VLAN and MAC Bridge components. That means
VLAN-aware and VLAN-unaware bridges. On the switch designs with CPU ports,
these frames are supposed to be processed by the CPU (software). So we make
the switch only forward them to the CPU port. And if received from a CPU
port, forward to a single port. The software is responsible of making the
switch conform to the latter by setting a single port as destination port
on the special tag.

This switch intellectual property cannot conform to this part of the
standard fully. Whilst the REV_UN frame tag covers the remaining :04-0D and
:0F MAC DAs, it also includes :22-FF which the scope of propagation is not
supposed to be restricted for these MAC DAs.

Set frames with :01-03 MAC DAs to be trapped to the CPU port(s). Add a
comment for the remaining MAC DAs.

Note that the ingress port must have a PVID assigned to it for the switch
to forward untagged frames. A PVID is set by default on VLAN-aware and
VLAN-unaware ports. However, when the network interface that pertains to
the ingress port is attached to a vlan_filtering enabled bridge, the user
can remove the PVID assignment from it which would prevent the link-local
frames from being trapped to the CPU port. I am yet to see a way to forward
link-local frames while preventing other untagged frames from being
forwarded too.

Fixes: b8f126a8d543 ("net-next: dsa: add dsa support for Mediatek MT7530 switch")
Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
---
 drivers/net/dsa/mt7530.c | 37 +++++++++++++++++++++++++++++++++----
 drivers/net/dsa/mt7530.h | 13 +++++++++++++
 2 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index ac887e929c79..0d3d328f757a 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -950,6 +950,21 @@ static void mt7530_setup_port5(struct dsa_switch *ds, phy_interface_t interface)
 	mutex_unlock(&priv->reg_mutex);
 }
 
+/* On page 205, section "8.6.3 Frame filtering" of the active standard, IEEE Std
+ * 802.1Q™-2022, it is stated that frames with 01:80:C2:00:00:00-0F as MAC DA
+ * must only be propagated to C-VLAN and MAC Bridge components. That means
+ * VLAN-aware and VLAN-unaware bridges. On the switch designs with CPU ports,
+ * these frames are supposed to be processed by the CPU (software). So we make
+ * the switch only forward them to the CPU port. And if received from a CPU
+ * port, forward to a single port. The software is responsible of making the
+ * switch conform to the latter by setting a single port as destination port on
+ * the special tag.
+ *
+ * This switch intellectual property cannot conform to this part of the standard
+ * fully. Whilst the REV_UN frame tag covers the remaining :04-0D and :0F MAC
+ * DAs, it also includes :22-FF which the scope of propagation is not supposed
+ * to be restricted for these MAC DAs.
+ */
 static void
 mt753x_trap_frames(struct mt7530_priv *priv)
 {
@@ -964,13 +979,27 @@ mt753x_trap_frames(struct mt7530_priv *priv)
 		   MT753X_BPDU_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
 		   MT753X_BPDU_CPU_ONLY);
 
-	/* Trap LLDP frames with :0E MAC DA to the CPU port(s) and egress them
-	 * VLAN-untagged.
+	/* Trap frames with :01 and :02 MAC DAs to the CPU port(s) and egress
+	 * them VLAN-untagged.
+	 */
+	mt7530_rmw(priv, MT753X_RGAC1, MT753X_R02_EG_TAG_MASK |
+		   MT753X_R02_PORT_FW_MASK | MT753X_R01_EG_TAG_MASK |
+		   MT753X_R01_PORT_FW_MASK,
+		   MT753X_R02_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
+		   MT753X_R02_PORT_FW(MT753X_BPDU_CPU_ONLY) |
+		   MT753X_R01_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
+		   MT753X_BPDU_CPU_ONLY);
+
+	/* Trap frames with :03 and :0E MAC DAs to the CPU port(s) and egress
+	 * them VLAN-untagged.
 	 */
 	mt7530_rmw(priv, MT753X_RGAC2, MT753X_R0E_EG_TAG_MASK |
-		   MT753X_R0E_PORT_FW_MASK,
+		   MT753X_R0E_PORT_FW_MASK | MT753X_R03_EG_TAG_MASK |
+		   MT753X_R03_PORT_FW_MASK,
 		   MT753X_R0E_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
-		   MT753X_R0E_PORT_FW(MT753X_BPDU_CPU_ONLY));
+		   MT753X_R0E_PORT_FW(MT753X_BPDU_CPU_ONLY) |
+		   MT753X_R03_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
+		   MT753X_BPDU_CPU_ONLY);
 }
 
 static void
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index 5566c905a415..d17b318e6ee4 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -73,12 +73,25 @@ enum mt753x_id {
 #define  MT753X_BPDU_EG_TAG(x)		FIELD_PREP(MT753X_BPDU_EG_TAG_MASK, x)
 #define  MT753X_BPDU_PORT_FW_MASK	GENMASK(2, 0)
 
+/* Register for :01 and :02 MAC DA frame control */
+#define MT753X_RGAC1			0x28
+#define  MT753X_R02_EG_TAG_MASK		GENMASK(24, 22)
+#define  MT753X_R02_EG_TAG(x)		FIELD_PREP(MT753X_R02_EG_TAG_MASK, x)
+#define  MT753X_R02_PORT_FW_MASK	GENMASK(18, 16)
+#define  MT753X_R02_PORT_FW(x)		FIELD_PREP(MT753X_R02_PORT_FW_MASK, x)
+#define  MT753X_R01_EG_TAG_MASK		GENMASK(8, 6)
+#define  MT753X_R01_EG_TAG(x)		FIELD_PREP(MT753X_R01_EG_TAG_MASK, x)
+#define  MT753X_R01_PORT_FW_MASK	GENMASK(2, 0)
+
 /* Register for :03 and :0E MAC DA frame control */
 #define MT753X_RGAC2			0x2c
 #define  MT753X_R0E_EG_TAG_MASK		GENMASK(24, 22)
 #define  MT753X_R0E_EG_TAG(x)		FIELD_PREP(MT753X_R0E_EG_TAG_MASK, x)
 #define  MT753X_R0E_PORT_FW_MASK	GENMASK(18, 16)
 #define  MT753X_R0E_PORT_FW(x)		FIELD_PREP(MT753X_R0E_PORT_FW_MASK, x)
+#define  MT753X_R03_EG_TAG_MASK		GENMASK(8, 6)
+#define  MT753X_R03_EG_TAG(x)		FIELD_PREP(MT753X_R03_EG_TAG_MASK, x)
+#define  MT753X_R03_PORT_FW_MASK	GENMASK(2, 0)
 
 enum mt753x_bpdu_port_fw {
 	MT753X_BPDU_FOLLOW_MFC,

-- 
2.40.1


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Re: [PATCH net v2 0/2] MT7530 DSA subdriver fix VLAN egress and handling of all link-local frames

[Paolo Abeni]

On Wed, 2024-03-20 at 19:41 +0300, Arınç ÜNAL wrote:
> On 14.03.2024 12:33, Arınç ÜNAL via B4 Relay wrote:
> > Hi.
> > 
> > This patch series fixes the VLAN tag egress procedure for link-local
> > frames, and fixes handling of all link-local frames.
> > 
> > Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
> > ---
> > Changes in v2:
> > - Add Fixes: tag to both patches.
> > - Link to v1: https://lore.kernel.org/r/20240311-b4-for-net-mt7530-fix-link-local-vlan-v1-0-d67e6cc31af2@arinc9.com
> > 
> > ---
> > Arınç ÜNAL (2):
> >        net: dsa: mt7530: fix link-local frames that ingress vlan filtering ports
> >        net: dsa: mt7530: fix handling of all link-local frames
> > 
> >   drivers/net/dsa/mt7530.c | 52 ++++++++++++++++++++++++++++++++++++++++--------
> >   drivers/net/dsa/mt7530.h | 22 +++++++++++++++++++-
> >   2 files changed, 65 insertions(+), 9 deletions(-)
> > ---
> > base-commit: d7d75124965aee23e5e4421d78376545cf070b0a
> > change-id: 20240208-b4-for-net-mt7530-fix-link-local-vlan-af6e9928ad8d
> > 
> > Best regards,
> 
> Reminder this patch series is waiting to be applied.

I hoped to get some feedback from the DSA crew, so it waited a bit in
patchwork. Anyway it looks like it staged long enough and I'll go
through it soon.

Cheers,

Paolo


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Re: [PATCH net v2 0/2] MT7530 DSA subdriver fix VLAN egress and handling of all link-local frames

[Paolo Abeni]

On Wed, 2024-03-20 at 19:41 +0300, Arınç ÜNAL wrote:
> On 14.03.2024 12:33, Arınç ÜNAL via B4 Relay wrote:
> > Hi.
> > 
> > This patch series fixes the VLAN tag egress procedure for link-local
> > frames, and fixes handling of all link-local frames.
> > 
> > Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>

For future memory: I think the SoB in the cover letter is not required,
and is, at least to me, a bit confusing.

No action needed here, I'll keep this unmodified, but I suggest to omit
it in future submission.

Thanks!

Paolo


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Re: [PATCH net v2 0/2] MT7530 DSA subdriver fix VLAN egress and handling of all link-local frames

[Konstantin Ryabitsev]

On Thu, Mar 21, 2024 at 02:29:19PM +0300, Arınç ÜNAL wrote:
> > For future memory: I think the SoB in the cover letter is not required,
> > and is, at least to me, a bit confusing.
> > 
> > No action needed here, I'll keep this unmodified, but I suggest to omit
> > it in future submission.
> 
> b4 puts it on the cover letter so it's not my doing.

This is done because many subsystems use the cover letter as the merge commit
message. Those subsystems who don't follow this practice don't generally care
if there's a Signed-Off-By in the cover letter anyway, so I don't see why this
is a concern that it's there.

-K

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Re: [PATCH net v2 0/2] MT7530 DSA subdriver fix VLAN egress and handling of all link-local frames

[Jakub Kicinski]

On Thu, 21 Mar 2024 09:19:02 -0400 Konstantin Ryabitsev wrote:
> On Thu, Mar 21, 2024 at 02:29:19PM +0300, Arınç ÜNAL wrote:
> > > For future memory: I think the SoB in the cover letter is not required,
> > > and is, at least to me, a bit confusing.
> > > 
> > > No action needed here, I'll keep this unmodified, but I suggest to omit
> > > it in future submission.  
> > 
> > b4 puts it on the cover letter so it's not my doing.  
> 
> This is done because many subsystems use the cover letter as the merge commit
> message. 

Could be wrong, but I think it was DaveM who originated this practice,
in networking..

> Those subsystems who don't follow this practice don't generally care
> if there's a Signed-Off-By in the cover letter anyway, so I don't see why this
> is a concern that it's there.

Because we have to remove it, extra work. And the benefit of adding it
in the first place is unclear.

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Re: [PATCH net v2 0/2] MT7530 DSA subdriver fix VLAN egress and handling of all link-local frames

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@redhat.com>:

On Thu, 14 Mar 2024 12:33:40 +0300 you wrote:
> Hi.
> 
> This patch series fixes the VLAN tag egress procedure for link-local
> frames, and fixes handling of all link-local frames.
> 
> Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
> 
> [...]

Here is the summary with links:
  - [net,v2,1/2] net: dsa: mt7530: fix link-local frames that ingress vlan filtering ports
    https://git.kernel.org/netdev/net/c/e8bf353577f3
  - [net,v2,2/2] net: dsa: mt7530: fix handling of all link-local frames
    https://git.kernel.org/netdev/net/c/69ddba9d170b

You are awesome, thank you!
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