https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206186

--- Comment #1 from Dmitry Vagin <[email protected]> ---
example use (with ng_patch):

 ngctl msg patch-1: "setdlt 1"
 ngctl msg checksum-1: "setdlt 1"

 ngctl msg ${_NAME}-patch-1: "setconfig { count=4 csum_flags=1
relative_offset=1 ops=[ \
   { mode=7 value=0x03 length=1 offset=1 } \
   { mode=8 value=0x88 length=1 offset=1 } \
   { mode=1 value=30120 length=2 offset=22 } \
   { mode=1 value=0 length=2 offset=26 } \
  ] }"

= set checksum flag CSUM_IP, set DSCP, set UDP port 30120, set UPD checksum = 0

 ngctl msg checksum-1: "setconfig { csum_flags=0 csum_offload=6 }"

= not sed additional checksum flags, set hardware can calculate
CSUM_IP_UDP|CSUM_IP_TCP.

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