[Bug 265714] igc(4) drops link under high traffic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265714

--- Comment #65 from Kevin Bowling <[email protected]> ---
(In reply to Tomasz "CeDeROM" CEDRO from comment #64)
I think the sysctl dump is post recovery?  The only clue is missed_packets,
maybe indicating an RX stall.  It would help to capture two snapshots a few
seconds apart before resetting while another host sends traffic: vmstat -i |
grep igc, netstat -I igc0 -bd, and the sysctl dumps.

Please also run these before, during, and after:

pciconf -lc igc0

and the following script:

/bin/sh <<'EOF'
cap=$(pciconf -lc igc0 |
    sed -n 's/.*ecap 001e\[\([0-9A-Fa-f][0-9A-Fa-f]*\)\].*/\1/p')

if [ -z "$cap" ]; then
    echo "L1PM capability 001e not found"
    exit 1
fi

off=$((0x${cap} + 8))
set -- $(pciconf -r igc0 "$off")
ctl1=$1

printf 'L1PM capability offset: 0x%s\n' "$cap"
printf 'L1PM CTL1 offset:      0x%x\n' "$off"
printf 'L1PM CTL1 value:       0x%s\n' "$ctl1"

if [ $((0x${ctl1} & 0x4)) -eq 0 ]; then
    echo 'I226 ASPM L1.2 enable: CLEAR (workaround active)'
else
    echo 'I226 ASPM L1.2 enable: SET (workaround absent/lost)'
fi
EOF

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