[FS#1333] MTK Ethernet Issues After NAPI polling Changes

[LEDE Bugs]

The following task has a new comment added:

FS#1333 - MTK Ethernet Issues After NAPI polling Changes
User who did this - Nathaniel Wesley Filardo (nwf)

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I am seeing identical dmesg logs (and no ethernet traffic) on a TEW714:


[   36.138722] ------------[ cut here ]------------
[   36.148024] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:316 dev_watchdog+0x1dc/0x25c
[   36.164570] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out
[   36.178480] Modules linked in: rt2800soc rt2800mmio rt2800lib rt2x00soc rt2x00mmio rt2x00lib mac80211 cfg80211 wireguard crc_itu_t crc_ccitt compat ip6_udp_tunnel udp_tunnel eeprom_93cx6 usb_storage leds_gpio sd_mod scsi_mod gpio_button_hotplug ext4 jbd2 mbcache usbcore nls_base usb_common crc16 crc32c_generic crypto_hash
[   36.235653] CPU: 0 PID: 0 Comm: swapper Not tainted 4.9.77 #0
[   36.247146] Stack : 803f751a 00000031 00000000 00000001 803ab4f4 803ab167 80364e10 00000000
[   36.263898]         803f3660 0000013c ffffffff 00000200 00200000 8004d150 8036a600 803b0000
[   36.280662]         00000003 0000013c 803687c8 8180de2c 00200000 8007b2cc 00000000 00000006
[   36.297389]         00000006 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   36.314149]         00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   36.330908]         ...
[   36.335777] Call Trace:
[   36.340740] [] show_stack+0x54/0x88
[   36.349526] [] __warn+0xe4/0x118
[   36.357701] [] warn_slowpath_fmt+0x30/0x3c
[   36.367692] [] dev_watchdog+0x1dc/0x25c
[   36.377180] [] call_timer_fn.isra.4+0x24/0x84
[   36.387678] [] run_timer_softirq+0x1ac/0x1f8
[   36.398018] [] __do_softirq+0x250/0x298
[   36.407477] [] handle_int+0x138/0x144
[   36.416580] [] __r4k_wait+0x20/0x40
[   36.425340] [] cpu_startup_entry+0x84/0xd0
[   36.435323] [] start_kernel+0x44c/0x46c
[   36.444770] ---[ end trace 2b4e1c347d94e320 ]---
[   36.454041] mtk_soc_eth 10100000.ethernet eth0: transmit timed out
[   36.466425] mtk_soc_eth 10100000.ethernet eth0: dma_cfg:00000057
[   36.478469] mtk_soc_eth 10100000.ethernet eth0: tx_ring=0, base=00eed000, max=128, ctx=2, dtx=0, fdx=0, next=2
[   36.498503] mtk_soc_eth 10100000.ethernet eth0: rx_ring=0, base=00e02000, max=128, calc=127, drx=0
[   47.178776] mtk_soc_eth 10100000.ethernet eth0: transmit timed out
[   47.191186] mtk_soc_eth 10100000.ethernet eth0: dma_cfg:00000057
[   47.203248] mtk_soc_eth 10100000.ethernet eth0: tx_ring=0, base=00e02000, max=128, ctx=2, dtx=0, fdx=0, next=2
[   47.223257] mtk_soc_eth 10100000.ethernet eth0: rx_ring=0, base=00d58000, max=128, calc=127, drx=0


I have not attempted to bisect between HEAD and the commit introducing support for this device, but can do so soonish, unless someone beats me to it.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1333#comment4337