[openwrt/openwrt] ramips: ethernet: Disable TSO support to improve stability

[LEDE Commits]

zorun pushed a commit to openwrt/openwrt.git, branch openwrt-19.07:
https://git.openwrt.org/f8b849103dfe1b21a6462837efc9460ca3cca02d

commit f8b849103dfe1b21a6462837efc9460ca3cca02d
Author: Baptiste Jonglez <git at bitsofnetworks.org>
AuthorDate: Mon Feb 15 10:12:59 2021 +0100

    ramips: ethernet: Disable TSO support to improve stability
    
    Stability of this Ethernet driver has been a long-standing issue, with
    many people reporting frequent "transmit queue timeouts" and even
    occasional crashes.
    
    Disabling TSO in the driver helps with stability, although it is likely a
    workaround and might not fix the issue completely.
    
    There is a slight slowdown in forwarding performance for TCP packets
    (75 kpps vs. 80 kpps with comparable CPU utilization), but this is still
    enough to forward close to 1 Gbit/s of full-sized packets across multiple
    flows.
    
    Master is using a different ethernet driver, so this is not a backport.
    Because of this different driver, the upcoming 21.02 release does not seem
    to be affected by these stability issues.
    
    Thanks to mrakotiq for the initial patch.
    
    Fixes: FS#2628
    Signed-off-by: Baptiste Jonglez <git at bitsofnetworks.org>
---
 .../linux/ramips/files-4.14/drivers/net/ethernet/mediatek/soc_mt7621.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/soc_mt7621.c b/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/soc_mt7621.c
index 26a198fa2b..3d2866af3a 100644
--- a/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/soc_mt7621.c
+++ b/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/soc_mt7621.c
@@ -143,8 +143,7 @@ static void mt7621_init_data(struct fe_soc_data *data,
 
 	netdev->hw_features = NETIF_F_IP_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_IPV6_CSUM |
+		NETIF_F_SG | NETIF_F_IPV6_CSUM |
 		NETIF_F_TSO_MANGLEID;
 }