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The Myri10GE NIC will assume all TSO frames contain partial checksum, and will emit TSO segments with bad TCP checksums if a TSO frame contains a full checksum. The mxge driver takes care to make sure that TSO is disabled when checksum offload is disabled for this reason. However, modules that modify packet contents (like pf) may end up completing a checksum on a TSO frame, leading to the NIC emitting TSO segments with bad checksums. To workaround this, restore the partial checksum in the mxge driver when we're fed a TSO frame with a full checksum. Reported by: Bob Healey MFC after: 3 days
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