target/linux/ipq40xx/patches-4.14/713-essedma-Disable-TCP-segmentation-offload-for-IPv6.patch

   1 From: Sven Eckelmann <sven@narfation.org>
   2 Date: Tue, 9 Jun 2020 14:08:44 +0200
   3 Subject: essedma: Disable TCP segmentation offload for IPv6
   4
   5 It was noticed that the the whole MAC can hang when transferring data from
   6 one ar40xx port (WAN ports) to the CPU and from the CPU back to another
   7 ar40xx port (LAN ports). The CPU was doing only NATing in that process.
   8
   9 Usually, the problem first starts with a simple data corruption:
  10
  11   $ wget https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-10.4.0-amd64-netinst.iso -O /dev/null
  12   ...
  13   Connecting to saimei.ftp.acc.umu.se (saimei.ftp.acc.umu.se)|2001:6b0:19::138|:443... connected.
  14   ...
  15   Read  error at byte 48807936/352321536 (Decryption has failed.). Retrying.
  16
  17 But after a short while, the whole MAC will stop to react. No traffic can
  18 be transported anymore from the CPU port from/to the AR40xx PHY/switch and
  19 the MAC has to be resetted.
  20
  21 Signed-off-by: Sven Eckelmann <sven@narfation.org>
  22
  23 --- a/drivers/net/ethernet/qualcomm/essedma/edma_axi.c
  24 +++ b/drivers/net/ethernet/qualcomm/essedma/edma_axi.c
  25 @@ -972,17 +972,14 @@ static int edma_axi_probe(struct platfor
  26                 edma_netdev[i]->features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM
  27                                       | NETIF_F_HW_VLAN_CTAG_TX
  28                                       | NETIF_F_HW_VLAN_CTAG_RX | NETIF_F_SG |
  29 -                                     NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_GRO;
  30 +                                     NETIF_F_TSO | NETIF_F_GRO;
  31                 edma_netdev[i]->hw_features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
  32                                 NETIF_F_HW_VLAN_CTAG_RX
  33 -                               | NETIF_F_SG | NETIF_F_TSO | NETIF_F_TSO6 |
  34 -                               NETIF_F_GRO;
  35 +                               | NETIF_F_SG | NETIF_F_TSO | NETIF_F_GRO;
  36                 edma_netdev[i]->vlan_features = NETIF_F_HW_CSUM | NETIF_F_SG |
  37 -                                          NETIF_F_TSO | NETIF_F_TSO6 |
  38 -                                          NETIF_F_GRO;
  39 +                                          NETIF_F_TSO | NETIF_F_GRO;
  40                 edma_netdev[i]->wanted_features = NETIF_F_HW_CSUM | NETIF_F_SG |
  41 -                                            NETIF_F_TSO | NETIF_F_TSO6 |
  42 -                                            NETIF_F_GRO;
  43 +                                            NETIF_F_TSO | NETIF_F_GRO;
  44
  45  #ifdef CONFIG_RFS_ACCEL
  46                 edma_netdev[i]->features |=  NETIF_F_RXHASH | NETIF_F_NTUPLE;