Hello,
While testing 9.2, we discovered that merely having pf enabled (no
rules of any kind) was sufficient to completely, unconditionally
disables hardware checksum offloading.
If pf is disabled ("pfctl -d") then checksum offloading works fine.
If pf is merely enabled with no rules ("pfctl -e -F all"), checksum
offloading no longer works.
The culprit appears to be this code in pf_check_out:
if ((*m)->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
in_delayed_cksum(*m);
(*m)->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
CSUM_DELAY_DATA is defined as (CSUM_TCP | CSUM_UDP) in sys/mbuf.h, so
this effectively clears (*m)->m_pkthdr.csum_flags and never puts it
back.
Is this behavior intentional?
Thanks!
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