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Mon, 29 Sep 2025 18:14:02 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 58TIE2Fn087749 for bugs@FreeBSD.org; Mon, 29 Sep 2025 18:14:02 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 289907] cxlv: problem with receive checksum offload Date: Mon, 29 Sep 2025 18:14:02 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: tuexen@freebsd.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D289907 Bug ID: 289907 Summary: cxlv: problem with receive checksum offload Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: tuexen@freebsd.org John reported a problem related to using a cxgbe VF on a Linux host with wi= th KVM, Qemu and libvirtd and running a FreeBSD guest. It turns out that incoming TCP packets are received with the correct csum_flags, but unexpected csum_data data. This is from instrumented code: 7 Dropping TCP/IPv4 packet with csum_flags 0xf000000, csum_data 0x00001d1e and SEG.CSUM e2e1 10 Dropping TCP/IPv4 packet with csum_flags 0xf000000, csum_data 0x000079a6 and SEG.CSUM 8659 3 Dropping TCP/IPv4 packet with csum_flags 0xf000000, csum_data 0x000079b6 and SEG.CSUM 8649 11 Dropping TCP/IPv4 packet with csum_flags 0xf000000, csum_data 0x00007a67 and SEG.CSUM 8598 21 Dropping TCP/IPv4 packet with csum_flags 0xf000000, csum_data 0x00007a6f and SEG.CSUM 8590 1 Dropping TCP/IPv4 packet with csum_flags 0xf000000, csum_data 0x00007a7b and SEG.CSUM 8584 Wireshark shows that packet as correct, in particular the checksums. Changing in https://cgit.freebsd.org/src/tree/sys/dev/cxgbe/t4_sge.c#n2043 m0->m_pkthdr.csum_data =3D be16toh(cpl->csum); to m0->m_pkthdr.csum_data =3D 0xffff makes the issue disappear. John also reports that the problem does NOT occur when using a FreeBSD host= and bhyve and a FreeBSD guest. --=20 You are receiving this mail because: You are the assignee for the bug.=