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authorSven Eckelmann <sven@narfation.org>2020-06-09 15:23:04 +0200
committerChristian Lamparter <chunkeey@gmail.com>2020-06-13 17:39:17 +0200
commitb515edb7750c67b05ebfaf0311780a894f9d0a3d (patch)
treeb7b25ba7f54cb8723e17e38b0560c631b21d095b /target
parentf7f15f80335cfa752149126177130ed0e8013ab9 (diff)
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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. The whole problem can be avoided by disabling IPv6 TSO for this ethernet MAC driver. Signed-off-by: Sven Eckelmann <sven@narfation.org> Acked-by: John Crispin <john@phrozen.org> (backported from commit 678569505623e50bbbbc344c7e820fb315b79ede, with updated commit message) Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Diffstat (limited to 'target')
-rw-r--r--target/linux/ipq40xx/patches-4.14/715-essedma-Disable-TCP-segmentation-offload-for-IPv6.patch46
1 files changed, 46 insertions, 0 deletions
diff --git a/target/linux/ipq40xx/patches-4.14/715-essedma-Disable-TCP-segmentation-offload-for-IPv6.patch b/target/linux/ipq40xx/patches-4.14/715-essedma-Disable-TCP-segmentation-offload-for-IPv6.patch
new file mode 100644
index 0000000000..bb36af7c73
--- /dev/null
+++ b/target/linux/ipq40xx/patches-4.14/715-essedma-Disable-TCP-segmentation-offload-for-IPv6.patch
@@ -0,0 +1,46 @@
+From: Sven Eckelmann <sven@narfation.org>
+Date: Tue, 9 Jun 2020 14:08:44 +0200
+Subject: 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>
+
+--- a/drivers/net/ethernet/qualcomm/essedma/edma_axi.c
++++ b/drivers/net/ethernet/qualcomm/essedma/edma_axi.c
+@@ -972,17 +972,14 @@ static int edma_axi_probe(struct platfor
+ 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;