Add Turris kernel (includes patches from OpenWrt)

1 files changed, 46 insertions, 0 deletions

diff --git a/pkgs/patches-linux-5.15/752-v5.16-net-dsa-qca8k-fix-MTU-calculation.patch b/pkgs/patches-linux-5.15/752-v5.16-net-dsa-qca8k-fix-MTU-calculation.patch
new file mode 100644
index 0000000..7348d93
--- /dev/null
+++ b/pkgs/patches-linux-5.15/752-v5.16-net-dsa-qca8k-fix-MTU-calculation.patch
@@ -0,0 +1,46 @@
+From 65258b9d8cde45689bdc86ca39b50f01f983733b Mon Sep 17 00:00:00 2001
+From: Robert Marko <robert.marko@sartura.hr>
+Date: Fri, 19 Nov 2021 03:03:50 +0100
+Subject: [PATCH] net: dsa: qca8k: fix MTU calculation
+
+qca8k has a global MTU, so its tracking the MTU per port to make sure
+that the largest MTU gets applied.
+Since it uses the frame size instead of MTU the driver MTU change function
+will then add the size of Ethernet header and checksum on top of MTU.
+
+The driver currently populates the per port MTU size as Ethernet frame
+length + checksum which equals 1518.
+
+The issue is that then MTU change function will go through all of the
+ports, find the largest MTU and apply the Ethernet header + checksum on
+top of it again, so for a desired MTU of 1500 you will end up with 1536.
+
+This is obviously incorrect, so to correct it populate the per port struct
+MTU with just the MTU and not include the Ethernet header + checksum size
+as those will be added by the MTU change function.
+
+Fixes: f58d2598cf70 ("net: dsa: qca8k: implement the port MTU callbacks")
+Signed-off-by: Robert Marko <robert.marko@sartura.hr>
+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 | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+--- a/drivers/net/dsa/qca8k.c
++++ b/drivers/net/dsa/qca8k.c
+@@ -1256,8 +1256,12 @@ qca8k_setup(struct dsa_switch *ds)
+ 		/* Set initial MTU for every port.
+ 		 * We have only have a general MTU setting. So track
+ 		 * every port and set the max across all port.
++		 * Set per port MTU to 1500 as the MTU change function
++		 * will add the overhead and if its set to 1518 then it
++		 * will apply the overhead again and we will end up with
++		 * MTU of 1536 instead of 1518
+ 		 */
+-		priv->port_mtu[i] = ETH_FRAME_LEN + ETH_FCS_LEN;
++		priv->port_mtu[i] = ETH_DATA_LEN;
+ 	}
+ 
+ 	/* Special GLOBAL_FC_THRESH value are needed for ar8327 switch */