kernel: 5.10: backport additional qca8k fixes

Backport 3 additional fixes for qca8k.
- Fix MTU calculation
- Fix a bug with config set to the wrong PAD when secondary cpu port is defined.
- Fix redundant check in parse_port_config

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.10/753-net-next-net-dsa-qca8k-remove-redundant-check-in-parse_port_config.patch b/target/linux/generic/backport-5.10/753-net-next-net-dsa-qca8k-remove-redundant-check-in-parse_port_config.patch
new file mode 100644
index 0000000000..f477b1b929
--- /dev/null
+++ b/target/linux/generic/backport-5.10/753-net-next-net-dsa-qca8k-remove-redundant-check-in-parse_port_config.patch
@@ -0,0 +1,29 @@
+From b9133f3ef5a2659730cf47a74bd0a9259f1cf8ff Mon Sep 17 00:00:00 2001
+From: Ansuel Smith <ansuelsmth@gmail.com>
+Date: Mon, 22 Nov 2021 16:23:40 +0100
+Subject: net: dsa: qca8k: remove redundant check in parse_port_config
+
+The very next check for port 0 and 6 already makes sure we don't go out
+of bounds with the ports_config delay table.
+Remove the redundant check.
+
+Reported-by: kernel test robot <lkp@intel.com>
+Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
+Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
+Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/dsa/qca8k.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/net/dsa/qca8k.c
++++ b/drivers/net/dsa/qca8k.c
+@@ -983,7 +983,7 @@ qca8k_parse_port_config(struct qca8k_pri
+ 	u32 delay;
+ 
+ 	/* We have 2 CPU port. Check them */
+-	for (port = 0; port < QCA8K_NUM_PORTS && cpu_port_index < QCA8K_NUM_CPU_PORTS; port++) {
++	for (port = 0; port < QCA8K_NUM_PORTS; port++) {
+ 		/* Skip every other port */
+ 		if (port != 0 && port != 6)
+ 			continue;