Hello,
I have an issue with an USB mbim modem when trying to send with ping
more than 14552 bytes: it looks like to me a kernel issue, but not at
the cdc_mbim or cdc_ncm level, anyway not sure, so I'm reporting the
issue.
My kernel is 4.16. The device is the following:
root@L2122:~# ifconfig
wwp0s20u7i2 Link encap:Ethernet HWaddr be:3d:f2:f4:0d:e9
inet addr:2.193.7.73 Bcast:0.0.0.0 Mask:255.255.255.252
inet6 addr: fe80::bc3d:f2ff:fef4:de9/64 Scope:Link
UP BROADCAST RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:5 errors:0 dropped:0 overruns:0 frame:0
TX packets:55 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:759 (759.0 B) TX bytes:6275 (6.2 KB)
Sending ping sized 14552 no issue:
root@L2122:~# ping -s 14552 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 14552(14580) bytes of data.
1448 bytes from 8.8.8.8: icmp_seq=1 ttl=52 (truncated)
1448 bytes from 8.8.8.8: icmp_seq=2 ttl=52 (truncated)
1448 bytes from 8.8.8.8: icmp_seq=3 ttl=52 (truncated)
1448 bytes from 8.8.8.8: icmp_seq=4 ttl=52 (truncated)
1448 bytes from 8.8.8.8: icmp_seq=5 ttl=52 (truncated)
1448 bytes from 8.8.8.8: icmp_seq=6 ttl=52 (truncated)
1448 bytes from 8.8.8.8: icmp_seq=7 ttl=52 (truncated)
1448 bytes from 8.8.8.8: icmp_seq=8 ttl=52 (truncated)
^C
--- 8.8.8.8 ping statistics ---
8 packets transmitted, 8 received, 0% packet loss, time 7008ms
rtt min/avg/max/mdev = 54.887/83.154/102.563/18.502 ms
root@L2122:~# ifconfig
wwp0s20u7i2 Link encap:Ethernet HWaddr be:3d:f2:f4:0d:e9
inet addr:2.193.7.73 Bcast:0.0.0.0 Mask:255.255.255.252
inet6 addr: fe80::bc3d:f2ff:fef4:de9/64 Scope:Link
UP BROADCAST RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:15 errors:0 dropped:0 overruns:0 frame:0
TX packets:161 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:12583 (12.5 KB) TX bytes:125999 (125.9 KB)
If I try ping sized 14554, it does not work
root@L2122:~# ping -s 14554 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 14554(14582) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
7 packets transmitted, 0 received, 100% packet loss, time 6122ms
and I see tx errors in the network interface
root@L2122:~# ifconfig
wwp0s20u7i2 Link encap:Ethernet HWaddr be:3d:f2:f4:0d:e9
inet addr:2.193.7.73 Bcast:0.0.0.0 Mask:255.255.255.252
inet6 addr: fe80::bc3d:f2ff:fef4:de9/64 Scope:Link
UP BROADCAST RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:20 errors:0 dropped:0 overruns:0 frame:0
TX packets:190 errors:5 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:12943 (12.9 KB) TX bytes:142476 (142.4 KB)
but the real problem is that the network interface seems not to be
working anymore:
root@L2122:~# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
10 packets transmitted, 0 received, 100% packet loss, time 9193ms
root@L2122:~#
root@L2122:~# ifconfig
wwp0s20u7i2 Link encap:Ethernet HWaddr be:3d:f2:f4:0d:e9
inet addr:2.193.7.73 Bcast:0.0.0.0 Mask:255.255.255.252
inet6 addr: fe80::bc3d:f2ff:fef4:de9/64 Scope:Link
UP BROADCAST RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:20 errors:0 dropped:0 overruns:0 frame:0
TX packets:190 errors:20 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:12943 (12.9 KB) TX bytes:142476 (142.4 KB)
Nothing relevant in the kernel log.
Anyone can suggest me how to debug this further?
Thanks in advance,
Daniele
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