Date: Wed, 30 Aug 2023 02:07:16 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 273431] No PCP (priority code point) on outbound traffic via em(4) when PCP and hardware VLAN tag insertion is disabled Message-ID: <bug-273431-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D273431 Bug ID: 273431 Summary: No PCP (priority code point) on outbound traffic via em(4) when PCP and hardware VLAN tag insertion is disabled Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: zlei@FreeBSD.org This is a crafted bug from WIP fix https://reviews.freebsd.org/D39536. A setup: em0 <---> igc0 Steps to repeat: Capture on igc0 ``` # ifconfig igc0 up # tcpdump -nevi igc0 ``` Disable PCP and hardware VLAN tag insertion, then send packets with priority ``` # ifconfig em0 -vlanhwtag -pcp # ifconfig em0 inet 192.0.2.1/24 # arp -s 192.0.2.2 0:1:2:3:4:5 # ping -c1 -C3 192.0.2.2 ``` Packets captured on igc0: ``` 09:53:57.397415 00:0c:29:73:4f:98 > 00:01:02:03:04:05, ethertype IPv4 (0x08= 00), length 98: (tos 0x0, ttl 64, id 19249, offset 0, flags [none], proto ICMP (= 1), length 84) 192.0.2.1 > 192.0.2.2: ICMP echo request, id 5382, seq 0, length 64 ``` When either hardware VLAN tag insertion is enabled, or enable default PCP on interface ``` # ifconfig em0 vlanhwtag ### or # ifconfig em0 pcp 0 ``` then the outbound packets looks good: ``` 10:00:03.189436 00:0c:29:73:4f:98 > 00:01:02:03:04:05, ethertype 802.1Q (0x8100), length 102: vlan 0, p 3, ethertype IPv4, (tos 0x0, ttl 64, id 335= 32, offset 0, flags [none], proto ICMP (1), length 84) 192.0.2.1 > 192.0.2.2: ICMP echo request, id 6662, seq 0, length 64 10:02:17.070757 00:0c:29:73:4f:98 > 00:01:02:03:04:05, ethertype 802.1Q (0x8100), length 102: vlan 0, p 3, ethertype IPv4, (tos 0x0, ttl 64, id 192= 50, offset 0, flags [none], proto ICMP (1), length 84) 192.0.2.1 > 192.0.2.2: ICMP echo request, id 8198, seq 0, length 64 ``` Expected behavior: outbound traffic should always have priority when application requires. --=20 You are receiving this mail because: You are the assignee for the bug.=
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