Date: Fri, 18 Aug 2023 10:01:41 +0200 From: =?UTF-8?Q?Jos=C3=A9_P=C3=A9rez?= <fbl@aoek.com> To: freebsd-net@freebsd.org Subject: em0: No buffer space available for IPv6 traffic but IPv4 is OK Message-ID: <503561ece3e7201318c298c2d5b91eb5@mail.yourbox.net>
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Hi,
on this intel em0
# dmesg |fgrep em0
em0: <Intel(R) Gigabit CT 82574L> port 0xd800-0xd81f mem
0xfe9e0000-0xfe9fffff,0xfe9dc000-0xfe9dffff irq 48 at device 0.0 on pci1
em0: Using 1024 TX descriptors and 1024 RX descriptors
em0: Using 2 RX queues 2 TX queues
em0: Using MSI-X interrupts with 3 vectors
em0: Ethernet address: xx:xx:xx:xx:xx:xx
em0: netmap queues/slots: TX 2/1024, RX 2/1024
IPv4 and IPv6 used to work seamlessly for the past 6+ years.
# ifconfig em0
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
1500
options=81249b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,LRO,WOL_MAGIC,VLAN_HWFILTER>
ether xx:xx:xx:xx:xx:xx
inet xxx.xxx.xxx.xxx netmask 0xffffff00 broadcast
xxx.xxx.xxx.255
inet6 fe80::xxxx:xxxx:xxxx:xxxx%em0 prefixlen 64 scopeid 0x1
inet6 2xxx:xxxx:xxxx:xxxx::1 prefixlen 64
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
Nevertheless, now IPv6 traffic does not work anymore:
# ping6 www.google.com
PING6(56=40+8+8 bytes) 2xxx:xxxx:xxxx:xxxx::1 --> 2yyy:yyyy:yyyy:yyyy::1
ping6: sendmsg: No buffer space available
ping6: wrote www.google.com 16 chars, ret=-1
From send(2):
[...]
[ENOBUFS] The system was unable to allocate an internal
buffer.
The operation may succeed when buffers become
available.
[ENOBUFS] The output queue for a network interface was
full.
This generally indicates that the interface has
stopped sending, but may be caused by transient
congestion.
[...]
There is little traffic on the interface and it seems that buffers are
available:
# netstat -m
2108/3472/5580 mbufs in use (current/cache/total)
2062/1336/3398/1018874 mbuf clusters in use (current/cache/total/max)
15/1250 mbuf+clusters out of packet secondary zone in use
(current/cache)
[...]
Interestingly, there is incoming IPv6 local broadcast traffic as sniffed
by
# tcpdump -n -i em0 ip6
(ICMP6, neighbor solicitation, UDP from LAN link local addresses).
Has anyone seen this before and can suggest a fix?
Reboot did not solve, no software updates made, no config changes, just
stop working from one day to the next.
Thank you.
--
José Pérez
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