[patch net v3] net: dsa: microchip: ksz9477: fix fdb_dump last invalid entry

[patch net v3] net: dsa: microchip: ksz9477: fix fdb_dump last invalid entry

[Arun Ramadoss]

In the ksz9477_fdb_dump function it reads the ALU control register and
exit from the timeout loop if there is valid entry or search is
complete. After exiting the loop, it reads the alu entry and report to
the user space irrespective of entry is valid. It works till the valid
entry. If the loop exited when search is complete, it reads the alu
table. The table returns all ones and it is reported to user space. So
bridge fdb show gives ff:ff:ff:ff:ff:ff as last entry for every port.
To fix it, after exiting the loop the entry is reported only if it is
valid one.

Fixes: b987e98e50ab ("dsa: add DSA switch driver for Microchip KSZ9477")
Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
---
changes in v3
- changed the subject from net-next to net

changes in v2
- changed the fixes commit id
- reduced the indentation level by using ! and continue statement

 drivers/net/dsa/microchip/ksz9477.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 4b14d80d27ed..e4f446db0ca1 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -613,6 +613,9 @@ int ksz9477_fdb_dump(struct ksz_device *dev, int port,
 			goto exit;
 		}
 
+		if (!(ksz_data & ALU_VALID))
+			continue;
+
 		/* read ALU table */
 		ksz9477_read_table(dev, alu_table);
 

base-commit: 7ebfc85e2cd7b08f518b526173e9a33b56b3913b
-- 
2.36.1

Re: [patch net v3] net: dsa: microchip: ksz9477: fix fdb_dump last invalid entry

[Vladimir Oltean]

On Tue, Aug 16, 2022 at 04:25:16PM +0530, Arun Ramadoss wrote:
> In the ksz9477_fdb_dump function it reads the ALU control register and
> exit from the timeout loop if there is valid entry or search is
> complete. After exiting the loop, it reads the alu entry and report to
> the user space irrespective of entry is valid. It works till the valid
> entry. If the loop exited when search is complete, it reads the alu
> table. The table returns all ones and it is reported to user space. So
> bridge fdb show gives ff:ff:ff:ff:ff:ff as last entry for every port.
> To fix it, after exiting the loop the entry is reported only if it is
> valid one.
> 
> Fixes: b987e98e50ab ("dsa: add DSA switch driver for Microchip KSZ9477")
> Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
> ---

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

Re: [patch net v3] net: dsa: microchip: ksz9477: fix fdb_dump last invalid entry

[patchwork-bot+netdevbpf]

Hello:

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

On Tue, 16 Aug 2022 16:25:16 +0530 you wrote:
> In the ksz9477_fdb_dump function it reads the ALU control register and
> exit from the timeout loop if there is valid entry or search is
> complete. After exiting the loop, it reads the alu entry and report to
> the user space irrespective of entry is valid. It works till the valid
> entry. If the loop exited when search is complete, it reads the alu
> table. The table returns all ones and it is reported to user space. So
> bridge fdb show gives ff:ff:ff:ff:ff:ff as last entry for every port.
> To fix it, after exiting the loop the entry is reported only if it is
> valid one.
> 
> [...]

Here is the summary with links:
  - [net,v3] net: dsa: microchip: ksz9477: fix fdb_dump last invalid entry
    https://git.kernel.org/netdev/net/c/36c0d9350157

You are awesome, thank you!
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