Patch "net: dsa: mt7530: trap link-local frames regardless of ST Port State" has been added to the 6.8-stable tree

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This is a note to let you know that I've just added the patch titled

    net: dsa: mt7530: trap link-local frames regardless of ST Port State

to the 6.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-dsa-mt7530-trap-link-local-frames-regardless-of-.patch
and it can be found in the queue-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3a6959ccccc084881268d57488a84c5cbf8453c4
Author: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>
Date:   Tue Apr 9 18:01:14 2024 +0300

    net: dsa: mt7530: trap link-local frames regardless of ST Port State
    
    [ Upstream commit 17c560113231ddc20088553c7b499b289b664311 ]
    
    In Clause 5 of IEEE Std 802-2014, two sublayers of the data link layer
    (DLL) of the Open Systems Interconnection basic reference model (OSI/RM)
    are described; the medium access control (MAC) and logical link control
    (LLC) sublayers. The MAC sublayer is the one facing the physical layer.
    
    In 8.2 of IEEE Std 802.1Q-2022, the Bridge architecture is described. A
    Bridge component comprises a MAC Relay Entity for interconnecting the Ports
    of the Bridge, at least two Ports, and higher layer entities with at least
    a Spanning Tree Protocol Entity included.
    
    Each Bridge Port also functions as an end station and shall provide the MAC
    Service to an LLC Entity. Each instance of the MAC Service is provided to a
    distinct LLC Entity that supports protocol identification, multiplexing,
    and demultiplexing, for protocol data unit (PDU) transmission and reception
    by one or more higher layer entities.
    
    It is described in 8.13.9 of IEEE Std 802.1Q-2022 that in a Bridge, the LLC
    Entity associated with each Bridge Port is modeled as being directly
    connected to the attached Local Area Network (LAN).
    
    On the switch with CPU port architecture, CPU port functions as Management
    Port, and the Management Port functionality is provided by software which
    functions as an end station. Software is connected to an IEEE 802 LAN that
    is wholly contained within the system that incorporates the Bridge.
    Software provides access to the LLC Entity associated with each Bridge Port
    by the value of the source port field on the special tag on the frame
    received by software.
    
    We call frames that carry control information to determine the active
    topology and current extent of each Virtual Local Area Network (VLAN),
    i.e., spanning tree or Shortest Path Bridging (SPB) and Multiple VLAN
    Registration Protocol Data Units (MVRPDUs), and frames from other link
    constrained protocols, such as Extensible Authentication Protocol over LAN
    (EAPOL) and Link Layer Discovery Protocol (LLDP), link-local frames. They
    are not forwarded by a Bridge. Permanently configured entries in the
    filtering database (FDB) ensure that such frames are discarded by the
    Forwarding Process. In 8.6.3 of IEEE Std 802.1Q-2022, this is described in
    detail:
    
    Each of the reserved MAC addresses specified in Table 8-1
    (01-80-C2-00-00-[00,01,02,03,04,05,06,07,08,09,0A,0B,0C,0D,0E,0F]) shall be
    permanently configured in the FDB in C-VLAN components and ERs.
    
    Each of the reserved MAC addresses specified in Table 8-2
    (01-80-C2-00-00-[01,02,03,04,05,06,07,08,09,0A,0E]) shall be permanently
    configured in the FDB in S-VLAN components.
    
    Each of the reserved MAC addresses specified in Table 8-3
    (01-80-C2-00-00-[01,02,04,0E]) shall be permanently configured in the FDB
    in TPMR components.
    
    The FDB entries for reserved MAC addresses shall specify filtering for all
    Bridge Ports and all VIDs. Management shall not provide the capability to
    modify or remove entries for reserved MAC addresses.
    
    The addresses in Table 8-1, Table 8-2, and Table 8-3 determine the scope of
    propagation of PDUs within a Bridged Network, as follows:
    
      The Nearest Bridge group address (01-80-C2-00-00-0E) is an address that
      no conformant Two-Port MAC Relay (TPMR) component, Service VLAN (S-VLAN)
      component, Customer VLAN (C-VLAN) component, or MAC Bridge can forward.
      PDUs transmitted using this destination address, or any other addresses
      that appear in Table 8-1, Table 8-2, and Table 8-3
      (01-80-C2-00-00-[00,01,02,03,04,05,06,07,08,09,0A,0B,0C,0D,0E,0F]), can
      therefore travel no further than those stations that can be reached via a
      single individual LAN from the originating station.
    
      The Nearest non-TPMR Bridge group address (01-80-C2-00-00-03), is an
      address that no conformant S-VLAN component, C-VLAN component, or MAC
      Bridge can forward; however, this address is relayed by a TPMR component.
      PDUs using this destination address, or any of the other addresses that
      appear in both Table 8-1 and Table 8-2 but not in Table 8-3
      (01-80-C2-00-00-[00,03,05,06,07,08,09,0A,0B,0C,0D,0F]), will be relayed
      by any TPMRs but will propagate no further than the nearest S-VLAN
      component, C-VLAN component, or MAC Bridge.
    
      The Nearest Customer Bridge group address (01-80-C2-00-00-00) is an
      address that no conformant C-VLAN component, MAC Bridge can forward;
      however, it is relayed by TPMR components and S-VLAN components. PDUs
      using this destination address, or any of the other addresses that appear
      in Table 8-1 but not in either Table 8-2 or Table 8-3
      (01-80-C2-00-00-[00,0B,0C,0D,0F]), will be relayed by TPMR components and
      S-VLAN components but will propagate no further than the nearest C-VLAN
      component or MAC Bridge.
    
    Because the LLC Entity associated with each Bridge Port is provided via CPU
    port, we must not filter these frames but forward them to CPU port.
    
    In a Bridge, the transmission Port is majorly decided by ingress and egress
    rules, FDB, and spanning tree Port State functions of the Forwarding
    Process. For link-local frames, only CPU port should be designated as
    destination port in the FDB, and the other functions of the Forwarding
    Process must not interfere with the decision of the transmission Port. We
    call this process trapping frames to CPU port.
    
    Therefore, on the switch with CPU port architecture, link-local frames must
    be trapped to CPU port, and certain link-local frames received by a Port of
    a Bridge comprising a TPMR component or an S-VLAN component must be
    excluded from it.
    
    A Bridge of the switch with CPU port architecture cannot comprise a
    Two-Port MAC Relay (TPMR) component as a TPMR component supports only a
    subset of the functionality of a MAC Bridge. A Bridge comprising two Ports
    (Management Port doesn't count) of this architecture will either function
    as a standard MAC Bridge or a standard VLAN Bridge.
    
    Therefore, a Bridge of this architecture can only comprise S-VLAN
    components, C-VLAN components, or MAC Bridge components. Since there's no
    TPMR component, we don't need to relay PDUs using the destination addresses
    specified on the Nearest non-TPMR section, and the proportion of the
    Nearest Customer Bridge section where they must be relayed by TPMR
    components.
    
    One option to trap link-local frames to CPU port is to add static FDB
    entries with CPU port designated as destination port. However, because that
    Independent VLAN Learning (IVL) is being used on every VID, each entry only
    applies to a single VLAN Identifier (VID). For a Bridge comprising a MAC
    Bridge component or a C-VLAN component, there would have to be 16 times
    4096 entries. This switch intellectual property can only hold a maximum of
    2048 entries. Using this option, there also isn't a mechanism to prevent
    link-local frames from being discarded when the spanning tree Port State of
    the reception Port is discarding.
    
    The remaining option is to utilise the BPC, RGAC1, RGAC2, RGAC3, and RGAC4
    registers. Whilst this applies to every VID, it doesn't contain all of the
    reserved MAC addresses without affecting the remaining Standard Group MAC
    Addresses. The REV_UN frame tag utilised using the RGAC4 register covers
    the remaining 01-80-C2-00-00-[04,05,06,07,08,09,0A,0B,0C,0D,0F] destination
    addresses. It also includes the 01-80-C2-00-00-22 to 01-80-C2-00-00-FF
    destination addresses which may be relayed by MAC Bridges or VLAN Bridges.
    The latter option provides better but not complete conformance.
    
    This switch intellectual property also does not provide a mechanism to trap
    link-local frames with specific destination addresses to CPU port by
    Bridge, to conform to the filtering rules for the distinct Bridge
    components.
    
    Therefore, regardless of the type of the Bridge component, link-local
    frames with these destination addresses will be trapped to CPU port:
    
    01-80-C2-00-00-[00,01,02,03,0E]
    
    In a Bridge comprising a MAC Bridge component or a C-VLAN component:
    
      Link-local frames with these destination addresses won't be trapped to
      CPU port which won't conform to IEEE Std 802.1Q-2022:
    
      01-80-C2-00-00-[04,05,06,07,08,09,0A,0B,0C,0D,0F]
    
    In a Bridge comprising an S-VLAN component:
    
      Link-local frames with these destination addresses will be trapped to CPU
      port which won't conform to IEEE Std 802.1Q-2022:
    
      01-80-C2-00-00-00
    
      Link-local frames with these destination addresses won't be trapped to
      CPU port which won't conform to IEEE Std 802.1Q-2022:
    
      01-80-C2-00-00-[04,05,06,07,08,09,0A]
    
    Currently on this switch intellectual property, if the spanning tree Port
    State of the reception Port is discarding, link-local frames will be
    discarded.
    
    To trap link-local frames regardless of the spanning tree Port State, make
    the switch regard them as Bridge Protocol Data Units (BPDUs). This switch
    intellectual property only lets the frames regarded as BPDUs bypass the
    spanning tree Port State function of the Forwarding Process.
    
    With this change, the only remaining interference is the ingress rules.
    When the reception Port has no PVID assigned on software, VLAN-untagged
    frames won't be allowed in. There doesn't seem to be a mechanism on the
    switch intellectual property to have link-local frames bypass this function
    of the Forwarding Process.
    
    Fixes: b8f126a8d543 ("net-next: dsa: add dsa support for Mediatek MT7530 switch")
    Reviewed-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
    Signed-off-by: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240409-b4-for-net-mt7530-fix-link-local-when-stp-discarding-v2-1-07b1150164ac@xxxxxxxxxx
    Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 40ae44c9945b1..22b97505fa536 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -998,20 +998,173 @@ 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.
+/* In Clause 5 of IEEE Std 802-2014, two sublayers of the data link layer (DLL)
+ * of the Open Systems Interconnection basic reference model (OSI/RM) are
+ * described; the medium access control (MAC) and logical link control (LLC)
+ * sublayers. The MAC sublayer is the one facing the physical layer.
  *
- * 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.
+ * In 8.2 of IEEE Std 802.1Q-2022, the Bridge architecture is described. A
+ * Bridge component comprises a MAC Relay Entity for interconnecting the Ports
+ * of the Bridge, at least two Ports, and higher layer entities with at least a
+ * Spanning Tree Protocol Entity included.
+ *
+ * Each Bridge Port also functions as an end station and shall provide the MAC
+ * Service to an LLC Entity. Each instance of the MAC Service is provided to a
+ * distinct LLC Entity that supports protocol identification, multiplexing, and
+ * demultiplexing, for protocol data unit (PDU) transmission and reception by
+ * one or more higher layer entities.
+ *
+ * It is described in 8.13.9 of IEEE Std 802.1Q-2022 that in a Bridge, the LLC
+ * Entity associated with each Bridge Port is modeled as being directly
+ * connected to the attached Local Area Network (LAN).
+ *
+ * On the switch with CPU port architecture, CPU port functions as Management
+ * Port, and the Management Port functionality is provided by software which
+ * functions as an end station. Software is connected to an IEEE 802 LAN that is
+ * wholly contained within the system that incorporates the Bridge. Software
+ * provides access to the LLC Entity associated with each Bridge Port by the
+ * value of the source port field on the special tag on the frame received by
+ * software.
+ *
+ * We call frames that carry control information to determine the active
+ * topology and current extent of each Virtual Local Area Network (VLAN), i.e.,
+ * spanning tree or Shortest Path Bridging (SPB) and Multiple VLAN Registration
+ * Protocol Data Units (MVRPDUs), and frames from other link constrained
+ * protocols, such as Extensible Authentication Protocol over LAN (EAPOL) and
+ * Link Layer Discovery Protocol (LLDP), link-local frames. They are not
+ * forwarded by a Bridge. Permanently configured entries in the filtering
+ * database (FDB) ensure that such frames are discarded by the Forwarding
+ * Process. In 8.6.3 of IEEE Std 802.1Q-2022, this is described in detail:
+ *
+ * Each of the reserved MAC addresses specified in Table 8-1
+ * (01-80-C2-00-00-[00,01,02,03,04,05,06,07,08,09,0A,0B,0C,0D,0E,0F]) shall be
+ * permanently configured in the FDB in C-VLAN components and ERs.
+ *
+ * Each of the reserved MAC addresses specified in Table 8-2
+ * (01-80-C2-00-00-[01,02,03,04,05,06,07,08,09,0A,0E]) shall be permanently
+ * configured in the FDB in S-VLAN components.
+ *
+ * Each of the reserved MAC addresses specified in Table 8-3
+ * (01-80-C2-00-00-[01,02,04,0E]) shall be permanently configured in the FDB in
+ * TPMR components.
+ *
+ * The FDB entries for reserved MAC addresses shall specify filtering for all
+ * Bridge Ports and all VIDs. Management shall not provide the capability to
+ * modify or remove entries for reserved MAC addresses.
+ *
+ * The addresses in Table 8-1, Table 8-2, and Table 8-3 determine the scope of
+ * propagation of PDUs within a Bridged Network, as follows:
+ *
+ *   The Nearest Bridge group address (01-80-C2-00-00-0E) is an address that no
+ *   conformant Two-Port MAC Relay (TPMR) component, Service VLAN (S-VLAN)
+ *   component, Customer VLAN (C-VLAN) component, or MAC Bridge can forward.
+ *   PDUs transmitted using this destination address, or any other addresses
+ *   that appear in Table 8-1, Table 8-2, and Table 8-3
+ *   (01-80-C2-00-00-[00,01,02,03,04,05,06,07,08,09,0A,0B,0C,0D,0E,0F]), can
+ *   therefore travel no further than those stations that can be reached via a
+ *   single individual LAN from the originating station.
+ *
+ *   The Nearest non-TPMR Bridge group address (01-80-C2-00-00-03), is an
+ *   address that no conformant S-VLAN component, C-VLAN component, or MAC
+ *   Bridge can forward; however, this address is relayed by a TPMR component.
+ *   PDUs using this destination address, or any of the other addresses that
+ *   appear in both Table 8-1 and Table 8-2 but not in Table 8-3
+ *   (01-80-C2-00-00-[00,03,05,06,07,08,09,0A,0B,0C,0D,0F]), will be relayed by
+ *   any TPMRs but will propagate no further than the nearest S-VLAN component,
+ *   C-VLAN component, or MAC Bridge.
+ *
+ *   The Nearest Customer Bridge group address (01-80-C2-00-00-00) is an address
+ *   that no conformant C-VLAN component, MAC Bridge can forward; however, it is
+ *   relayed by TPMR components and S-VLAN components. PDUs using this
+ *   destination address, or any of the other addresses that appear in Table 8-1
+ *   but not in either Table 8-2 or Table 8-3 (01-80-C2-00-00-[00,0B,0C,0D,0F]),
+ *   will be relayed by TPMR components and S-VLAN components but will propagate
+ *   no further than the nearest C-VLAN component or MAC Bridge.
+ *
+ * Because the LLC Entity associated with each Bridge Port is provided via CPU
+ * port, we must not filter these frames but forward them to CPU port.
+ *
+ * In a Bridge, the transmission Port is majorly decided by ingress and egress
+ * rules, FDB, and spanning tree Port State functions of the Forwarding Process.
+ * For link-local frames, only CPU port should be designated as destination port
+ * in the FDB, and the other functions of the Forwarding Process must not
+ * interfere with the decision of the transmission Port. We call this process
+ * trapping frames to CPU port.
+ *
+ * Therefore, on the switch with CPU port architecture, link-local frames must
+ * be trapped to CPU port, and certain link-local frames received by a Port of a
+ * Bridge comprising a TPMR component or an S-VLAN component must be excluded
+ * from it.
+ *
+ * A Bridge of the switch with CPU port architecture cannot comprise a Two-Port
+ * MAC Relay (TPMR) component as a TPMR component supports only a subset of the
+ * functionality of a MAC Bridge. A Bridge comprising two Ports (Management Port
+ * doesn't count) of this architecture will either function as a standard MAC
+ * Bridge or a standard VLAN Bridge.
+ *
+ * Therefore, a Bridge of this architecture can only comprise S-VLAN components,
+ * C-VLAN components, or MAC Bridge components. Since there's no TPMR component,
+ * we don't need to relay PDUs using the destination addresses specified on the
+ * Nearest non-TPMR section, and the proportion of the Nearest Customer Bridge
+ * section where they must be relayed by TPMR components.
+ *
+ * One option to trap link-local frames to CPU port is to add static FDB entries
+ * with CPU port designated as destination port. However, because that
+ * Independent VLAN Learning (IVL) is being used on every VID, each entry only
+ * applies to a single VLAN Identifier (VID). For a Bridge comprising a MAC
+ * Bridge component or a C-VLAN component, there would have to be 16 times 4096
+ * entries. This switch intellectual property can only hold a maximum of 2048
+ * entries. Using this option, there also isn't a mechanism to prevent
+ * link-local frames from being discarded when the spanning tree Port State of
+ * the reception Port is discarding.
+ *
+ * The remaining option is to utilise the BPC, RGAC1, RGAC2, RGAC3, and RGAC4
+ * registers. Whilst this applies to every VID, it doesn't contain all of the
+ * reserved MAC addresses without affecting the remaining Standard Group MAC
+ * Addresses. The REV_UN frame tag utilised using the RGAC4 register covers the
+ * remaining 01-80-C2-00-00-[04,05,06,07,08,09,0A,0B,0C,0D,0F] destination
+ * addresses. It also includes the 01-80-C2-00-00-22 to 01-80-C2-00-00-FF
+ * destination addresses which may be relayed by MAC Bridges or VLAN Bridges.
+ * The latter option provides better but not complete conformance.
+ *
+ * This switch intellectual property also does not provide a mechanism to trap
+ * link-local frames with specific destination addresses to CPU port by Bridge,
+ * to conform to the filtering rules for the distinct Bridge components.
+ *
+ * Therefore, regardless of the type of the Bridge component, link-local frames
+ * with these destination addresses will be trapped to CPU port:
+ *
+ * 01-80-C2-00-00-[00,01,02,03,0E]
+ *
+ * In a Bridge comprising a MAC Bridge component or a C-VLAN component:
+ *
+ *   Link-local frames with these destination addresses won't be trapped to CPU
+ *   port which won't conform to IEEE Std 802.1Q-2022:
+ *
+ *   01-80-C2-00-00-[04,05,06,07,08,09,0A,0B,0C,0D,0F]
+ *
+ * In a Bridge comprising an S-VLAN component:
+ *
+ *   Link-local frames with these destination addresses will be trapped to CPU
+ *   port which won't conform to IEEE Std 802.1Q-2022:
+ *
+ *   01-80-C2-00-00-00
+ *
+ *   Link-local frames with these destination addresses won't be trapped to CPU
+ *   port which won't conform to IEEE Std 802.1Q-2022:
+ *
+ *   01-80-C2-00-00-[04,05,06,07,08,09,0A]
+ *
+ * To trap link-local frames to CPU port as conformant as this switch
+ * intellectual property can allow, link-local frames are made to be regarded as
+ * Bridge Protocol Data Units (BPDUs). This is because this switch intellectual
+ * property only lets the frames regarded as BPDUs bypass the spanning tree Port
+ * State function of the Forwarding Process.
+ *
+ * The only remaining interference is the ingress rules. When the reception Port
+ * has no PVID assigned on software, VLAN-untagged frames won't be allowed in.
+ * There doesn't seem to be a mechanism on the switch intellectual property to
+ * have link-local frames bypass this function of the Forwarding Process.
  */
 static void
 mt753x_trap_frames(struct mt7530_priv *priv)
@@ -1019,35 +1172,43 @@ mt753x_trap_frames(struct mt7530_priv *priv)
 	/* 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);
+	mt7530_rmw(priv, MT753X_BPC,
+		   MT753X_PAE_BPDU_FR | MT753X_PAE_EG_TAG_MASK |
+			   MT753X_PAE_PORT_FW_MASK | MT753X_BPDU_EG_TAG_MASK |
+			   MT753X_BPDU_PORT_FW_MASK,
+		   MT753X_PAE_BPDU_FR |
+			   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 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);
+	mt7530_rmw(priv, MT753X_RGAC1,
+		   MT753X_R02_BPDU_FR | MT753X_R02_EG_TAG_MASK |
+			   MT753X_R02_PORT_FW_MASK | MT753X_R01_BPDU_FR |
+			   MT753X_R01_EG_TAG_MASK | MT753X_R01_PORT_FW_MASK,
+		   MT753X_R02_BPDU_FR |
+			   MT753X_R02_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
+			   MT753X_R02_PORT_FW(MT753X_BPDU_CPU_ONLY) |
+			   MT753X_R01_BPDU_FR |
+			   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_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_R03_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
-		   MT753X_BPDU_CPU_ONLY);
+	mt7530_rmw(priv, MT753X_RGAC2,
+		   MT753X_R0E_BPDU_FR | MT753X_R0E_EG_TAG_MASK |
+			   MT753X_R0E_PORT_FW_MASK | MT753X_R03_BPDU_FR |
+			   MT753X_R03_EG_TAG_MASK | MT753X_R03_PORT_FW_MASK,
+		   MT753X_R0E_BPDU_FR |
+			   MT753X_R0E_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
+			   MT753X_R0E_PORT_FW(MT753X_BPDU_CPU_ONLY) |
+			   MT753X_R03_BPDU_FR |
+			   MT753X_R03_EG_TAG(MT7530_VLAN_EG_UNTAGGED) |
+			   MT753X_BPDU_CPU_ONLY);
 }
 
 static int
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index 75bc9043c8c0a..ddefeb69afda1 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -65,6 +65,7 @@ enum mt753x_id {
 
 /* Registers for BPDU and PAE frame control*/
 #define MT753X_BPC			0x24
+#define  MT753X_PAE_BPDU_FR		BIT(25)
 #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)
@@ -75,20 +76,24 @@ enum mt753x_id {
 
 /* Register for :01 and :02 MAC DA frame control */
 #define MT753X_RGAC1			0x28
+#define  MT753X_R02_BPDU_FR		BIT(25)
 #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_BPDU_FR		BIT(9)
 #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_BPDU_FR		BIT(25)
 #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_BPDU_FR		BIT(9)
 #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)




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