| Message ID | 20210728175327.1150120-3-dqfext@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | mt7530 software fallback bridging fix | expand |
| Context | Check | Description |
|---|---|---|
| netdev/cover_letter | success | Link |
| netdev/fixes_present | success | Link |
| netdev/patch_count | success | Link |
| netdev/tree_selection | success | Clearly marked for net-next |
| netdev/subject_prefix | success | Link |
| netdev/cc_maintainers | success | CCed 13 of 13 maintainers |
| netdev/source_inline | success | Was 0 now: 0 |
| netdev/verify_signedoff | success | Link |
| netdev/module_param | success | Was 0 now: 0 |
| netdev/build_32bit | success | Errors and warnings before: 0 this patch: 0 |
| netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
| netdev/verify_fixes | success | Link |
| netdev/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 144 lines checked |
| netdev/build_allmodconfig_warn | success | Errors and warnings before: 0 this patch: 0 |
| netdev/header_inline | success | Link |
On Thu, Jul 29, 2021 at 01:53:26AM +0800, DENG Qingfang wrote: > /* Register for setup vlan and acl write data */ > @@ -153,6 +162,35 @@ enum mt7530_vlan_cmd { > #define PORT_MEM_SHFT 16 > #define PORT_MEM_MASK 0xff > > +/* ACL rule pattern */ > +#define BIT_CMP(x) (((x) & 0xffff) << 16) > +#define CMP_PAT(x) ((x) & 0xffff) not used > + > +/* ACL rule action */ > +#define ACL_MANG BIT(29) > +#define ACL_INT_EN BIT(28) > +#define ACL_CNT_EN BIT(27) > +#define ACL_CNT_IDX(x) (((x) & 0x7) << 24) > +#define VLAN_PORT_EN BIT(23) > +#define DA_SWAP BIT(22) > +#define SA_SWAP BIT(21) > +#define PPP_RM BIT(20) > +#define LKY_VLAN BIT(19) > +#define ACL_EG_TAG(x) (((x) & 0x7) << 16) > +#define ACL_PORT(x) (((x) & 0xff) << 8) > +#define ACL_PORT_EN BIT(7) > +#define PRI_USER(x) (((x) & 0x7) << 4) > +#define ACL_MIR_EN BIT(3) > +#define ACL_PORT_FW(x) ((x) & 0x7) > + > +enum mt7530_to_cpu_port_fw { > + PORT_FW_DEFAULT, > + PORT_FW_EXCLUDE_CPU = 4, > + PORT_FW_INCLUDE_CPU, > + PORT_FW_CPU_ONLY, > + PORT_FW_DROP, > +}; not used > + > #define MT7530_VAWD2 0x98 > /* Egress Tag Control */ > #define ETAG_CTRL_P(p, x) (((x) & 0x3) << ((p) << 1)) > @@ -164,6 +202,23 @@ enum mt7530_vlan_egress_attr { > MT7530_VLAN_EGRESS_STACK = 3, > }; > > +/* ACL rule pattern */ > +#define ACL_TABLE_EN BIT(19) > +#define OFST_TP(x) (((x) & 0x7) << 16) > +#define ACL_SP(x) (((x) & 0xff) << 8) > +#define WORD_OFST(x) (((x) & 0x7f) << 1) > +#define CMP_SEL BIT(0) not used > + > +enum mt7530_acl_offset_type { > + MT7530_ACL_MAC_HEADER, > + MT7530_ACL_L2_PAYLOAD, > + MT7530_ACL_IP_HEADER, > + MT7530_ACL_IP_DATAGRAM, > + MT7530_ACL_TCP_UDP_HEADER, > + MT7530_ACL_TCP_UDP_DATAGRAM, > + MT7530_ACL_IPV6_HEADER, > +}; not used > + > /* Register for address age control */ > #define MT7530_AAC 0xa0 > /* Disable ageing */ > @@ -192,6 +247,7 @@ enum mt7530_stp_state { > > /* Register for port control */ > #define MT7530_PCR_P(x) (0x2004 + ((x) * 0x100)) > +#define PORT_ACL_EN BIT(10) > #define PORT_TX_MIR BIT(9) > #define PORT_RX_MIR BIT(8) > #define PORT_VLAN(x) ((x) & 0x3) > -- > 2.25.1 >
On Thu, Jul 29, 2021 at 01:53:26AM +0800, DENG Qingfang wrote: > MT7530's FDB has 8 filter IDs, but they are only available for shared > VLAN learning, and all VLAN-unaware ports use 0 as the default filter > ID. Actually, on second thought... If MT7530 supports 8 FIDs and it has 7 ports, then you can assign one FID to each standalone port or VLAN-unaware bridge it is a member of. The drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c driver has a similar concept, only instead of FID, it manages FDB IDs - each port is assigned to an FDB ID and it learns and looks up MAC addresses only within that FDB ID. Every standalone port uses its own fdb_id, and every port under the same bridge shares the same fdb_id (the fdb_id associated with a bridge is equal with the fdb_id of the first standalone port that joins that bridge; every other standalone port that joins a bridge will change its fdb_id to that of the bridge). When a port leaves a bridge and becomes standalone again, its fdb_id will again change to the first unused value. My point is that if you search for "fdb_id" in that driver you will maybe find some inspiration for how things like this can be managed. I know it's not 100% the same as your situation (the FDBs in the dpaa2-switch are selected by the VLAN table, and for that reason, the dpaa2-switch can only operate as VLAN-aware, and with shared VLAN learning per FDB), but the same concept can be reused, I think. With each port and VLAN-unaware bridge having its own FID, I think you will not have the shortcircuit issue any longer (and with VLAN-aware bridges you shouldn't have it anyway).
On Thu, Jul 29, 2021 at 11:28 PM Vladimir Oltean <olteanv@gmail.com> wrote: > Actually, on second thought... > If MT7530 supports 8 FIDs and it has 7 ports, then you can assign one > FID to each standalone port or VLAN-unaware bridge it is a member of. The problem is, there is no way to do that.. According to the reference manual: Filter ID is learned automatically from VLAN Table. 0 is the default value if VLAN Table is not applicable. So it is always 0 in VLAN-unaware mode.
On Fri, Jul 30, 2021 at 12:11:45AM +0800, DENG Qingfang wrote: > On Thu, Jul 29, 2021 at 11:28 PM Vladimir Oltean <olteanv@gmail.com> wrote: > > Actually, on second thought... > > If MT7530 supports 8 FIDs and it has 7 ports, then you can assign one > > FID to each standalone port or VLAN-unaware bridge it is a member of. > > The problem is, there is no way to do that.. > > According to the reference manual: > Filter ID is learned automatically from VLAN Table. 0 is the default value if > VLAN Table is not applicable. > > So it is always 0 in VLAN-unaware mode. I have the MT7621 GSW, and sadly this reference manual isn't the best in explaining what is and what is not possible. For example, I am still not clear what is meant by "VID1" and "VID0". Is "VID1" the inner (customer) VLAN tag, and "VID0" the outer (service) VLAN tag, or "VID1" means the actual VLAN ID 1? And the bits 3:1 of VAWD1 (VLAN table access register) indicate a FID field per VLAN. I cannot find the piece that you quoted in this manual. But what I expect to happen for a Transparent Port is that the packets are always classified to that port's PVID, and the VLAN Table is looked up with that PVID. There, it will find the FID, which this driver currently always configures as zero. In my manual's description, in the "Transparent Port" chapter, it does explicitly say: VID0 and VID1 will store PVID as the default VID which is used to look up the VLAN table. So I get the impression that the phrase "the VLAN table is not applicable" is not quite correct, but I might be wrong...
On Fri, Jul 30, 2021 at 12:50 AM Vladimir Oltean <olteanv@gmail.com> wrote: > I have the MT7621 GSW, and sadly this reference manual isn't the best in > explaining what is and what is not possible. For example, I am still not > clear what is meant by "VID1" and "VID0". Is "VID1" the inner (customer) > VLAN tag, and "VID0" the outer (service) VLAN tag, or "VID1" means the > actual VLAN ID 1? > > And the bits 3:1 of VAWD1 (VLAN table access register) indicate a FID > field per VLAN. I cannot find the piece that you quoted in this manual. > But what I expect to happen for a Transparent Port is that the packets > are always classified to that port's PVID, and the VLAN Table is looked > up with that PVID. There, it will find the FID, which this driver > currently always configures as zero. In my manual's description, in the > "Transparent Port" chapter, it does explicitly say: > > VID0 and VID1 will store PVID as the default VID which is used > to look up the VLAN table. > > So I get the impression that the phrase "the VLAN table is not applicable" > is not quite correct, but I might be wrong... Alright, I think I've made some progress. In the current code, we only use two combinations to toggle user ports' VLAN awareness: one is PCR.PORT_VLAN set to port matrix mode with PVC.VLAN_ATTR set to transparent port, the other is PCR.PORT_VLAN set to security mode with PVC.VLAN_ATTR set to user port. It turns out that only PVC.VLAN_ATTR contributes to VLAN awareness. Port matrix mode just skips the VLAN table lookup. The reference manual is somehow misleading when describing PORT_VLAN modes (See Page 17 of MT7531 Reference Manual, available at http://wiki.banana-pi.org/Banana_Pi_BPI-R64#Resources). It states that PORT_MEM (VLAN port member) is used for destination if the VLAN table lookup hits, but actually it uses **PORT_MEM & PORT_MATRIX** (bitwise AND of VLAN port member and port matrix) instead, which means we can have two or more separate VLAN-aware bridges with the same PVID and traffic won't leak between them. So I came up with a solution: Set PORT_VLAN to fallback mode when in VLAN-unaware mode, this way, even VLAN-unaware bridges will use independent VLAN filtering. Then assign all standalone ports to a reserved VLAN.
On Fri, Jul 30, 2021 at 11:45:41PM +0800, DENG Qingfang wrote: > So I came up with a solution: Set PORT_VLAN to fallback mode when in > VLAN-unaware mode, this way, even VLAN-unaware bridges will use > independent VLAN filtering. Then assign all standalone ports to a independent VLAN *learning > reserved VLAN.
On Fri, Jul 30, 2021 at 11:45:41PM +0800, DENG Qingfang wrote: > On Fri, Jul 30, 2021 at 12:50 AM Vladimir Oltean <olteanv@gmail.com> wrote: > > I have the MT7621 GSW, and sadly this reference manual isn't the best in > > explaining what is and what is not possible. For example, I am still not > > clear what is meant by "VID1" and "VID0". Is "VID1" the inner (customer) > > VLAN tag, and "VID0" the outer (service) VLAN tag, or "VID1" means the > > actual VLAN ID 1? > > > > And the bits 3:1 of VAWD1 (VLAN table access register) indicate a FID > > field per VLAN. I cannot find the piece that you quoted in this manual. > > But what I expect to happen for a Transparent Port is that the packets > > are always classified to that port's PVID, and the VLAN Table is looked > > up with that PVID. There, it will find the FID, which this driver > > currently always configures as zero. In my manual's description, in the > > "Transparent Port" chapter, it does explicitly say: > > > > VID0 and VID1 will store PVID as the default VID which is used > > to look up the VLAN table. > > > > So I get the impression that the phrase "the VLAN table is not applicable" > > is not quite correct, but I might be wrong... > > Alright, I think I've made some progress. > In the current code, we only use two combinations to toggle user > ports' VLAN awareness: one is PCR.PORT_VLAN set to port matrix mode > with PVC.VLAN_ATTR set to transparent port, the other is PCR.PORT_VLAN > set to security mode with PVC.VLAN_ATTR set to user port. > > It turns out that only PVC.VLAN_ATTR contributes to VLAN awareness. > Port matrix mode just skips the VLAN table lookup. The reference > manual is somehow misleading when describing PORT_VLAN modes (See Page > 17 of MT7531 Reference Manual, available at > http://wiki.banana-pi.org/Banana_Pi_BPI-R64#Resources). It states that > PORT_MEM (VLAN port member) is used for destination if the VLAN table > lookup hits, but actually it uses **PORT_MEM & PORT_MATRIX** (bitwise > AND of VLAN port member and port matrix) instead, which means we can > have two or more separate VLAN-aware bridges with the same PVID and > traffic won't leak between them. Ah, but it's not completely misleading. It does say: 2'b01: Fallback mode Enable 802.1Q function for all the received frames. Do not discard received frames due to ingress membership violation. **Frames whose VID is missed on the VLAN table will be filtered by the Port Matrix Member**. (emphasis mine on the last paragraph) > So I came up with a solution: Set PORT_VLAN to fallback mode when in > VLAN-unaware mode, this way, even VLAN-unaware bridges will use > independent VLAN filtering. If you did indeed test that the Port Matrix is still used to enforce separation between ports if the VLAN table _does_ match and we're in fallback mode, then we should be okay. > Then assign all standalone ports to a reserved VLAN. You mean all standalone ports to the same VLAN ID, like 4095, or each standalone port to a separate reserved VLAN ID? As long as address learning is disabled on the standalone ports, I guess using a single VLAN ID like 4095 for all of them is just fine, the Port Matrix will take care of the rest.
On Fri, Jul 30, 2021 at 07:18:52PM +0300, Vladimir Oltean wrote: > > It turns out that only PVC.VLAN_ATTR contributes to VLAN awareness. > > Port matrix mode just skips the VLAN table lookup. The reference > > manual is somehow misleading when describing PORT_VLAN modes (See Page > > 17 of MT7531 Reference Manual, available at > > http://wiki.banana-pi.org/Banana_Pi_BPI-R64#Resources). It states that > > PORT_MEM (VLAN port member) is used for destination if the VLAN table > > lookup hits, but actually it uses **PORT_MEM & PORT_MATRIX** (bitwise > > AND of VLAN port member and port matrix) instead, which means we can > > have two or more separate VLAN-aware bridges with the same PVID and > > traffic won't leak between them. > > Ah, but it's not completely misleading. It does say: > > 2'b01: Fallback mode > > Enable 802.1Q function for all the received frames. > Do not discard received frames due to ingress membership violation. > **Frames whose VID is missed on the VLAN table will be filtered > by the Port Matrix Member**. > > (emphasis mine on the last paragraph) > > > So I came up with a solution: Set PORT_VLAN to fallback mode when in > > VLAN-unaware mode, this way, even VLAN-unaware bridges will use > > independent VLAN filtering. > > If you did indeed test that the Port Matrix is still used to enforce > separation between ports if the VLAN table _does_ match and we're in > fallback mode, then we should be okay. Yes, that's what I mean. Tested as well. > > > Then assign all standalone ports to a reserved VLAN. > > You mean all standalone ports to the same VLAN ID, like 4095, or each > standalone port to a separate reserved VLAN ID? As long as address > learning is disabled on the standalone ports, I guess using a single > VLAN ID like 4095 for all of them is just fine, the Port Matrix will > take care of the rest. I just found a cleaner solution: Leaving standalone ports in port matrix mode. As all bridges use independent VLAN learning, standalone ports' FDB lookup with FID 0 won't hit.
On Sat, Jul 31, 2021 at 01:21:14AM +0800, DENG Qingfang wrote: > I just found a cleaner solution: Leaving standalone ports in port matrix > mode. As all bridges use independent VLAN learning, standalone ports' > FDB lookup with FID 0 won't hit. So standalone ports are completely VLAN-unaware and always use a FID of 0, ports under a VLAN-unaware bridge are in fallback mode (look up the VLAN table but don't drop on miss), use a FID of 1-7, and ports under a VLAN-aware bridge are in the security mode and use the CVID instead of the FID for VLAN classification? Make sure to test a mix of standalone, VLAN-unaware bridge and VLAN-aware bridge with the same MAC address in all 3 domains. If that works well this should be really good.
On Fri, Jul 30, 2021 at 08:35:11PM +0300, Vladimir Oltean wrote: > On Sat, Jul 31, 2021 at 01:21:14AM +0800, DENG Qingfang wrote: > > I just found a cleaner solution: Leaving standalone ports in port matrix > > mode. As all bridges use independent VLAN learning, standalone ports' > > FDB lookup with FID 0 won't hit. > > So standalone ports are completely VLAN-unaware and always use a FID of > 0, ports under a VLAN-unaware bridge are in fallback mode (look up the > VLAN table but don't drop on miss), use a FID of 1-7, and ports under a > VLAN-aware bridge are in the security mode and use the CVID instead of > the FID for VLAN classification? No. Both VLAN-unaware and VLAN-aware bridges use independent VLAN learning i.e. use CVID for FDB lookup. > > Make sure to test a mix of standalone, VLAN-unaware bridge and > VLAN-aware bridge with the same MAC address in all 3 domains. If that > works well this should be really good.
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c index 69f21b71614c..6b5c85446e6f 100644 --- a/drivers/net/dsa/mt7530.c +++ b/drivers/net/dsa/mt7530.c @@ -1228,6 +1228,8 @@ mt7530_port_bridge_join(struct dsa_switch *ds, int port, mt7530_rmw(priv, MT7530_PCR_P(port), PCR_MATRIX_MASK, PCR_MATRIX(port_bitmap)); priv->ports[port].pm |= PCR_MATRIX(port_bitmap); + /* Don't trap frames to the CPU port */ + mt7530_clear(priv, MT7530_PCR_P(port), PORT_ACL_EN); mutex_unlock(&priv->reg_mutex); @@ -1328,6 +1330,8 @@ mt7530_port_bridge_leave(struct dsa_switch *ds, int port, mt7530_rmw(priv, MT7530_PCR_P(port), PCR_MATRIX_MASK, PCR_MATRIX(BIT(MT7530_CPU_PORT))); priv->ports[port].pm = PCR_MATRIX(BIT(MT7530_CPU_PORT)); + /* Trap all frames to the CPU port */ + mt7530_set(priv, MT7530_PCR_P(port), PORT_ACL_EN); mutex_unlock(&priv->reg_mutex); } @@ -2037,6 +2041,24 @@ mt7530_setup_mdio(struct mt7530_priv *priv) return ret; } +static void +mt7530_setup_acl(struct mt7530_priv *priv) +{ + u32 action; + + /* Set ACL pattern mask to 0 to match unconditionally */ + mt7530_write(priv, MT7530_VAWD1, 0); + mt7530_write(priv, MT7530_VAWD2, 0); + mt7530_vlan_cmd(priv, MT7530_VTCR_WR_ACL_MASK, 0); + + /* Set ACL action to forward frames to the CPU port */ + action = ACL_PORT_EN | ACL_PORT(BIT(MT7530_CPU_PORT)) | + ACL_EG_TAG(MT7530_VLAN_EG_CONSISTENT); + mt7530_write(priv, MT7530_VAWD1, action); + mt7530_write(priv, MT7530_VAWD2, 0); + mt7530_vlan_cmd(priv, MT7530_VTCR_WR_ACL_ACTION, 0); +} + static int mt7530_setup(struct dsa_switch *ds) { @@ -2133,6 +2155,8 @@ mt7530_setup(struct dsa_switch *ds) /* Disable learning by default on all user ports */ mt7530_set(priv, MT7530_PSC_P(i), SA_DIS); + /* Trap all frames to the CPU port */ + mt7530_set(priv, MT7530_PCR_P(i), PORT_ACL_EN); } /* Enable consistent egress tag */ mt7530_rmw(priv, MT7530_PVC_P(i), PVC_EG_TAG_MASK, @@ -2300,6 +2324,8 @@ mt7531_setup(struct dsa_switch *ds) /* Disable learning by default on all user ports */ mt7530_set(priv, MT7530_PSC_P(i), SA_DIS); + /* Trap all frames to the CPU port */ + mt7530_set(priv, MT7530_PCR_P(i), PORT_ACL_EN); } /* Enable consistent egress tag */ @@ -3005,6 +3031,8 @@ mt753x_setup(struct dsa_switch *ds) if (ret) return ret; + mt7530_setup_acl(priv); + ret = mt7530_setup_irq(priv); if (ret) return ret; diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h index b19b389ff10a..10cb278d7c36 100644 --- a/drivers/net/dsa/mt7530.h +++ b/drivers/net/dsa/mt7530.h @@ -137,6 +137,15 @@ enum mt7530_vlan_cmd { */ MT7530_VTCR_RD_VID = 0, MT7530_VTCR_WR_VID = 1, + /* Read/Write the specified ACL rule pattern */ + MT7530_VTCR_RD_ACL_PATTERN = 4, + MT7530_VTCR_WR_ACL_PATTERN = 5, + /* Read/Write the specified ACL rule mask */ + MT7530_VTCR_RD_ACL_MASK = 8, + MT7530_VTCR_WR_ACL_MASK = 9, + /* Read/Write the specified ACL rule action */ + MT7530_VTCR_RD_ACL_ACTION = 10, + MT7530_VTCR_WR_ACL_ACTION = 11, }; /* Register for setup vlan and acl write data */ @@ -153,6 +162,35 @@ enum mt7530_vlan_cmd { #define PORT_MEM_SHFT 16 #define PORT_MEM_MASK 0xff +/* ACL rule pattern */ +#define BIT_CMP(x) (((x) & 0xffff) << 16) +#define CMP_PAT(x) ((x) & 0xffff) + +/* ACL rule action */ +#define ACL_MANG BIT(29) +#define ACL_INT_EN BIT(28) +#define ACL_CNT_EN BIT(27) +#define ACL_CNT_IDX(x) (((x) & 0x7) << 24) +#define VLAN_PORT_EN BIT(23) +#define DA_SWAP BIT(22) +#define SA_SWAP BIT(21) +#define PPP_RM BIT(20) +#define LKY_VLAN BIT(19) +#define ACL_EG_TAG(x) (((x) & 0x7) << 16) +#define ACL_PORT(x) (((x) & 0xff) << 8) +#define ACL_PORT_EN BIT(7) +#define PRI_USER(x) (((x) & 0x7) << 4) +#define ACL_MIR_EN BIT(3) +#define ACL_PORT_FW(x) ((x) & 0x7) + +enum mt7530_to_cpu_port_fw { + PORT_FW_DEFAULT, + PORT_FW_EXCLUDE_CPU = 4, + PORT_FW_INCLUDE_CPU, + PORT_FW_CPU_ONLY, + PORT_FW_DROP, +}; + #define MT7530_VAWD2 0x98 /* Egress Tag Control */ #define ETAG_CTRL_P(p, x) (((x) & 0x3) << ((p) << 1)) @@ -164,6 +202,23 @@ enum mt7530_vlan_egress_attr { MT7530_VLAN_EGRESS_STACK = 3, }; +/* ACL rule pattern */ +#define ACL_TABLE_EN BIT(19) +#define OFST_TP(x) (((x) & 0x7) << 16) +#define ACL_SP(x) (((x) & 0xff) << 8) +#define WORD_OFST(x) (((x) & 0x7f) << 1) +#define CMP_SEL BIT(0) + +enum mt7530_acl_offset_type { + MT7530_ACL_MAC_HEADER, + MT7530_ACL_L2_PAYLOAD, + MT7530_ACL_IP_HEADER, + MT7530_ACL_IP_DATAGRAM, + MT7530_ACL_TCP_UDP_HEADER, + MT7530_ACL_TCP_UDP_DATAGRAM, + MT7530_ACL_IPV6_HEADER, +}; + /* Register for address age control */ #define MT7530_AAC 0xa0 /* Disable ageing */ @@ -192,6 +247,7 @@ enum mt7530_stp_state { /* Register for port control */ #define MT7530_PCR_P(x) (0x2004 + ((x) * 0x100)) +#define PORT_ACL_EN BIT(10) #define PORT_TX_MIR BIT(9) #define PORT_RX_MIR BIT(8) #define PORT_VLAN(x) ((x) & 0x3)
Consider the following bridge configuration, where bond0 is not offloaded: +-- br0 --+ / / | \ / / | \ / | | bond0 / | | / \ swp0 swp1 swp2 swp3 swp4 . . . . . . A B C Ideally, when the switch receives a packet from swp3 or swp4, it should forward the packet to the CPU, according to the port matrix and unknown unicast flood settings. But packet loss will happen if the destination address is at one of the offloaded ports (swp0~2). For example, when client C sends a packet to A, the FDB lookup will indicate that it should be forwarded to swp0, but the port matrix of swp3 and swp4 is configured to only allow the CPU to be its destination, so it is dropped. MT7530's FDB has 8 filter IDs, but they are only available for shared VLAN learning, and all VLAN-unaware ports use 0 as the default filter ID. Fortunately, MT7530 supports ACL, and the ACL action happens before the FDB lookup. So we install an ACL rule which traps all packets to the CPU, and enable it for standalone ports. This way, the packet loss can be avoided. Signed-off-by: DENG Qingfang <dqfext@gmail.com> --- drivers/net/dsa/mt7530.c | 28 ++++++++++++++++++++ drivers/net/dsa/mt7530.h | 56 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 84 insertions(+)