Date: Tue, 04 Sep 2018 12:25:56 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 231151] ifconfig: unable to disable rxcsum, rxcsum6 and vlanhwcsum on em driver Message-ID: <bug-231151-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231151 Bug ID: 231151 Summary: ifconfig: unable to disable rxcsum, rxcsum6 and vlanhwcsum on em driver Product: Base System Version: CURRENT Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: mshirk@daemon-security.com In 12-CURRENT, I would like to be able to turn off all NIC offloading features (TSO,LRO,Checksums) to ensure I am reading everything as it appears off the wire for network security (Bro NSM). Putting all of the flags together, this is what I have as the line that should disable all of the features /sbin/ifconfig em0 -rxcsum -txcsum -tso4 -tso6 -lro -rxcsum6 -txcsum6 -vlanhwcsum -vlanhwtso It appears most work with and are enabled and disabled, the exceptions are rxcsum, rxcsum6 and vlanhwcsum. I cannot disable vlanhwcsum at all, and when you disable rxcsum, it enables rxcsum6 and vice versa. Example: # ifconfig em0 em0: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC> metric 0 mtu 1500 options=810099<RXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWFILTER> ether 68:05:ca:xx:xx:xx media: Ethernet autoselect (1000baseT <full-duplex>) status: active nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> # ifconfig em0 -rxcsum # ifconfig em0 em0: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC> metric 0 mtu 1500 options=a10098<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWFILTER,RXCSUM_IPV6> ether 68:05:ca:xx:xx:xx media: Ethernet autoselect (1000baseT <full-duplex>) status: active nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> # ifconfig em0 -rxcsum6 # ifconfig em0 em0: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC> metric 0 mtu 1500 options=810099<RXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWFILTER> ther 68:05:ca:xx:xx:xx media: Ethernet autoselect (1000baseT <full-duplex>) status: active nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> I see the same behavior with this driver on two separate cards. em0@pci0:1:0:0: class=0x020000 card=0x115e8086 chip=0x105e8086 rev=0x06 hdr=0x00 vendor = 'Intel Corporation' device = '82571EB/82571GB Gigabit Ethernet Controller D0/D1 (copper applications)' class = network subclass = ethernet em0@pci0:0:31:6: class=0x020000 card=0x06d91028 chip=0x15b78086 rev=0x31 hdr=0x00 vendor = 'Intel Corporation' device = 'Ethernet Connection (2) I219-LM' class = network subclass = ethernet If this is "by design" in the driver, then this bug can be closed, but I would assume that if you want to disable all receive side offloading, you should be able to disable it for both IPv4 and IPv6. Also, if this is a driver issue (iflib), then I can move the bug to kernel component. -- You are receiving this mail because: You are the assignee for the bug.
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