From: Arun Ramadoss arun.ramadoss@microchip.com
stable inclusion from stable-v5.10.138 commit 9900af65f2d1f571c022061f42a8c3ded8eb16a0 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I60QFD
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 36c0d935015766bf20d621c18313f17691bda5e3 upstream.
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 Link: https://lore.kernel.org/r/20220816105516.18350-1-arun.ramadoss@microchip.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Reviewed-by: Wei Li liwei391@huawei.com --- 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 b3aa99eb6c2c..ece4c0512ee2 100644 --- a/drivers/net/dsa/microchip/ksz9477.c +++ b/drivers/net/dsa/microchip/ksz9477.c @@ -762,6 +762,9 @@ static int ksz9477_port_fdb_dump(struct dsa_switch *ds, int port, goto exit; }
+ if (!(ksz_data & ALU_VALID)) + continue; + /* read ALU table */ ksz9477_read_table(dev, alu_table);