kern/54235: Kingston KNE110TX (tlp) has problems with large amounts of data

[henry.r.bent%gmail.com@localhost]

>Number:         54235
>Category:       kern
>Synopsis:       Kingston KNE110TX (tlp) has problems with large amounts of data
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 26 19:40:00 +0000 2019
>Originator:     Henry R. Bent
>Release:        8.0
>Organization:
>Environment:
NetBSD performa6400 8.0 NetBSD 8.0 (PERFORMA6400) #4: Sun May 26 15:15:06 EDT 2019  root@performa6400:/usr/src/sys/arch/macppc/compile/PERFORMA6400 macppc
>Description:
tlp0 at pci0 dev 14 function 0: Lite-On 82C169 Ethernet, pass 2.0
tlp0: interrupting at irq 25
tlp0: Ethernet address 00:c0:f0:2d:fd:53
ukphy0 at tlp0 phy 1: MTD972 10/100 media interface (OUI 0x00032d, model 0x0000), rev. 8

This Kingston KNE110TX appears to have problems dealing with large amounts of ethernet data.  The system will boot, run ntpdate, can do basic ping/nslookup/etc. but heavier traffic (nfs, large pings, etc.) will give lots of:

tlp0: discarding oversize frame (len=16379)

The size is always the same.
>How-To-Repeat:
ping is the easiest way to see this:

performa6400# ping -s 8192 192.168.1.63
PING aelfric (192.168.1.63): 8192 data bytes
8200 bytes from 192.168.1.63: icmp_seq=0 ttl=64 time=7.210900 ms
8200 bytes from 192.168.1.63: icmp_seq=1 ttl=64 time=4.541900 ms
8200 bytes from 192.168.1.63: icmp_seq=2 ttl=64 time=4.468500 ms

performa6400# ping -s 9216 192.168.1.63
PING aelfric (192.16tlp0: discarding oversize frame (len=16379)
8.1.63): 9216 data bytes
9224 bytes from 192.168.1.63: icmp_seq=1 ttl=64 time=5.504400 ms
9224 bytes from 192.168.1.63: icmp_seq=2 ttl=64 time=5.025300 ms

performa6400# ping -s 16384 192.168.1.63
PING aelfric (192.168.1.63)tlp0: discarding oversize frame (len=16379)
tlp0: discarding oversize frame (len=16379)
: 16384 data bytes
tlp0: discarding oversize frame (len=16379)
tlp0: discarding oversize frame (len=16379)
tlp0: discarding oversize frame (len=16379)
>Fix:
No idea, sorry.