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A few months ago we got 3 Dell PowerEdge™ R6515 machines and installed
Ubuntu 20.04 LTS. After a few days problems started showing on the
network interface for the internal network. The network link is
disconnected, and a few seconds later it is connected again. We have
updated all the server firmware, checked the cables and switch but the
problem persists. Digging deeper in the logs we found this in dmesg
(full log in the attached file):
[Sat Jan 30 09:57:07 2021] NETDEV WATCHDOG: eno2 (tg3): transmit queue 0 timed
out
[Sat Jan 30 09:57:07 2021] tg3 0000:c1:00.1 eno2: transmit timed out, resetting
[Sat Jan 30 09:57:08 2021] tg3 0000:c1:00.1 eno2: Link is down
[Sat Jan 30 09:57:12 2021] tg3 0000:c1:00.1 eno2: Link is up at 1000 Mbps, full
duplex
For some reason, the link is disconnected and reconnected a few seconds
later. This happens randomly on all 3 servers and it does not seem to
correlate with the current traffic on that interface. The problem seems
to be very similar to Bug #1331513 but this happens on the up to date
Ubutnu 20.04 (last updated mid last week).
If you need any additional info, feel free to ask.
Additional info:
--------------------------------------
linux-firmware/now 1.187.8 all
linux-image-5.4.0-64-generic/focal-updates,focal-updates,now 5.4.0-64.72 amd64
linux-image-generic/now 5.4.0.64.67 amd64
--------------------------------------
lspci -nnk | grep -iA2 net
c1:00.0 Ethernet controller [0200]: Broadcom Inc. and subsidiaries NetXtreme
BCM5720 2-port Gigabit Ethernet PCIe [14e4:165f]
DeviceName: NIC1
Subsystem: Dell PowerEdge R6515/R7515 LOM [1028:08fd]
--
c1:00.1 Ethernet controller [0200]: Broadcom Inc. and subsidiaries NetXtreme
BCM5720 2-port Gigabit Ethernet PCIe [14e4:165f]
DeviceName: NIC2
Subsystem: Dell PowerEdge R6515/R7515 LOM [1028:08fd]
--------------------------------------
modinfo tg3 | grep ^version
version: 3.137
--------------------------------------
lshw -C network
*-network:0
description: Ethernet interface
product: NetXtreme BCM5720 2-port Gigabit Ethernet PCIe
vendor: Broadcom Inc. and subsidiaries
physical id: 0
bus info: pci@0000:c1:00.0
logical name: eno1
version: 00
serial: 34:48:ed:ef:07:0e
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm vpd msi msix pciexpress bus_master cap_list rom
ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd
autonegotiation
configuration: autonegotiation=on broadcast=yes driver=tg3
driverversion=3.137 duplex=full firmware=FFV21.60.16 bc 5720-v1.39
ip=213.133.114.208 latency=0 link=yes multicast=yes port=twisted pair
speed=1Gbit/s
resources: irq:160 memory:c7030000-c703ffff memory:c7040000-c704ffff
memory:c7050000-c705ffff memory:c7100000-c713ffff
*-network:1
description: Ethernet interface
product: NetXtreme BCM5720 2-port Gigabit Ethernet PCIe
vendor: Broadcom Inc. and subsidiaries
physical id: 0.1
bus info: pci@0000:c1:00.1
logical name: eno2
version: 00
serial: 34:48:ed:ef:07:0f
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm vpd msi msix pciexpress bus_master cap_list rom
ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd
autonegotiation
configuration: autonegotiation=on broadcast=yes driver=tg3
driverversion=3.137 duplex=full firmware=FFV21.60.16 bc 5720-v1.39 ip=10.0.1.6
latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
resources: irq:163 memory:c7000000-c700ffff memory:c7010000-c701ffff
memory:c7020000-c702ffff memory:c7140000-c717ffff
--------------------------------
ethtool --show-offload eno2
Features for eno2:
rx-checksumming: on
tx-checksumming: on
tx-checksum-ipv4: on
tx-checksum-ip-generic: off [fixed]
tx-checksum-ipv6: on
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
scatter-gather: on
tx-scatter-gather: on
tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: on
tx-tcp-segmentation: on
tx-tcp-ecn-segmentation: on
tx-tcp-mangleid-segmentation: off
tx-tcp6-segmentation: on
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: on [fixed]
tx-vlan-offload: on [fixed]
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
highdma: on
rx-vlan-filter: off [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
tx-gre-csum-segmentation: off [fixed]
tx-ipxip4-segmentation: off [fixed]
tx-ipxip6-segmentation: off [fixed]
tx-udp_tnl-segmentation: off [fixed]
tx-udp_tnl-csum-segmentation: off [fixed]
tx-gso-partial: off [fixed]
tx-sctp-segmentation: off [fixed]
tx-esp-segmentation: off [fixed]
tx-udp-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: off
loopback: off [fixed]
rx-fcs: off [fixed]
rx-all: off [fixed]
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
l2-fwd-offload: off [fixed]
hw-tc-offload: off [fixed]
esp-hw-offload: off [fixed]
esp-tx-csum-hw-offload: off [fixed]
rx-udp_tunnel-port-offload: off [fixed]
tls-hw-tx-offload: off [fixed]
tls-hw-rx-offload: off [fixed]
rx-gro-hw: off [fixed]
tls-hw-record: off [fixed]
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bcm5720 broadcom r6515 tg3
--
Netdev watchdog closes link on PowerEdge R6515 Realtek BCM5720
https://bugs.launchpad.net/bugs/1914022
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