ipq40xx: essedma: Disable TCP segmentation offload for IPv6

It was noticed that the the whole MAC can hang when transferring data from
one ar40xx port (WAN ports) to the CPU and from the CPU back to another
ar40xx port (LAN ports). The CPU was doing only NATing in that process.

Usually, the problem first starts with a simple data corruption:

  $ wget https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-10.4.0-amd64-netinst.iso -O /dev/null
  ...
  Connecting to saimei.ftp.acc.umu.se (saimei.ftp.acc.umu.se)|2001:6b0:19::138|:443... connected.
  ...
  Read  error at byte 48807936/352321536 (Decryption has failed.). Retrying.

But after a short while, the whole MAC will stop to react. No traffic can
be transported anymore from the CPU port from/to the AR40xx PHY/switch and
the MAC has to be resetted.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Acked-by: John Crispin <john@phrozen.org>

diff --git a/target/linux/ipq40xx/files-5.4/drivers/net/ethernet/qualcomm/essedma/edma_axi.c b/target/linux/ipq40xx/files-5.4/drivers/net/ethernet/qualcomm/essedma/edma_axi.c
index b619bbbab9d8f997c4b665897df7e79357afb9db..96a82b31169eaaceacf5d9639905bcadb780abbd 100644 (file)
--- a/target/linux/ipq40xx/files-5.4/drivers/net/ethernet/qualcomm/essedma/edma_axi.c
+++ b/target/linux/ipq40xx/files-5.4/drivers/net/ethernet/qualcomm/essedma/edma_axi.c
@@ -970,17 +970,14 @@ static int edma_axi_probe(struct platform_device *pdev)
                edma_netdev[i]->features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM
                                      | NETIF_F_HW_VLAN_CTAG_TX
                                      | NETIF_F_HW_VLAN_CTAG_RX | NETIF_F_SG |
-                                     NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_GRO;
+                                     NETIF_F_TSO | NETIF_F_GRO;
                edma_netdev[i]->hw_features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
                                NETIF_F_HW_VLAN_CTAG_RX
-                               | NETIF_F_SG | NETIF_F_TSO | NETIF_F_TSO6 |
-                               NETIF_F_GRO;
+                               | NETIF_F_SG | NETIF_F_TSO | NETIF_F_GRO;
                edma_netdev[i]->vlan_features = NETIF_F_HW_CSUM | NETIF_F_SG |
-                                          NETIF_F_TSO | NETIF_F_TSO6 |
-                                          NETIF_F_GRO;
+                                          NETIF_F_TSO | NETIF_F_GRO;
                edma_netdev[i]->wanted_features = NETIF_F_HW_CSUM | NETIF_F_SG |
-                                            NETIF_F_TSO | NETIF_F_TSO6 |
-                                            NETIF_F_GRO;
+                                            NETIF_F_TSO | NETIF_F_GRO;
 
 #ifdef CONFIG_RFS_ACCEL
                edma_netdev[i]->features |=  NETIF_F_RXHASH | NETIF_F_NTUPLE;