[Bug 280074] em(4) temporarily hangs and re-enables TX CSUM if a bridge it's a member of is modified

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280074

--- Comment #24 from Zhenlei Huang <[email protected]> ---
(In reply to Joshua Kinard from comment #12)
> (In reply to Michael Tuexen from comment #11)
> I gave this patch a test on the affected machine, and it did not resolve the
> problem I am describing.

Enabling txcsum on bridge(4) does not help in this case. These capabilities
want to be disabled on bridge(4) members.


> if_bridge filters two categories:
> * List of capabilities to possibly mask on the member interface.
> #define	BRIDGE_IFCAPS_MASK		(IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
                                         IFCAP_TXCSUM_IPV6|IFCAP_MEXTPG)
> which means these have to match on bridged interfaces or get masked
> and
> * List of capabilities to strip
> #define	BRIDGE_IFCAPS_STRIP		IFCAP_LRO
> which are always masked.

(In reply to Joshua Kinard from comment #17)
> These are my lines in /etc/rc.conf that I use to configure the interfaces,
> including comments:

>> # Setup em0 interface for wired networking
>> EM0_IPV4="x.x.x.x/24"
>> EM0_IPV6="fdxx:xxxx:xxxx:xxxx::xxxx:xxxx/120"
>> EM0_MTU=9000
>> EM_OPTS="-wol -lro -tso -rxcsum -rxcsum6 -txcsum -txcsum6 -vlanmtu -vlanhwtag -vlanhwfilter -vlanhwcsum -vlanhwtso"
>> ifconfig_em0="inet ${EM0_IPV4} ${EM_OPTS} mtu ${EM0_MTU}"
>> ifconfig_em0_ipv6="inet6 ${EM0_IPV6}"

Please try this EM_OPTS on 15.0-RELEASE,
EM_OPTS="-lro -tso -tso6 -mextpg"

Or this if you have disabled txcsum and txcsum6 on epair(4) bridge members,
EM_OPTS="-lro -tso -tso6 -txcsum -txcsum6 -mextpg"

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