Date: Wed, 21 Jan 2026 14:21:43 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 291420] [epair] Bad UDP packet checksum with epair(4) and txcsum enabled Message-ID: <bug-291420-7501-8mP8DFhrxQ@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-291420-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291420 --- Comment #31 from commit-hook@FreeBSD.org --- A commit in branch stable/14 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=39a25aa8a736a827f7a99e682fdb1579af4e8df5 commit 39a25aa8a736a827f7a99e682fdb1579af4e8df5 Author: Michael Tuexen <tuexen@FreeBSD.org> AuthorDate: 2026-01-16 12:32:13 +0000 Commit: Michael Tuexen <tuexen@FreeBSD.org> CommitDate: 2026-01-21 14:11:56 +0000 bge: disable TXCSUM if UDP transmit checksum offloading is disabled The bge interface is special with respect to transmit checksumi offloading. In the default settings, an bge interface announces TXCSUM capabilities, but only supports TCP/IPv4 and not UDP/IPv4 due to limitations of some of the NICs. This results in problems when the bge interface becomes a member of a bridge. Since currently only the TXCSUM capabilities are synced when a member is added to a bridge and not the protocol specific capabilities, this can result in a situation where UDP packets are sent out using a bge interface without having a correct checksum. To mitigate this problem, initially don't announce TXCSUM capabilities, when UDP transmit checksum is disabled. It is still possible to enable TXCSUM capabilities via ifconfig. PR: 291420 Reviewed by: Timo Voelker Differential Revision: https://reviews.freebsd.org/D54486 (cherry picked from commit bbd30927b1af44226c8de0512912a7fedfce2824) share/man/man4/bge.4 | 10 +++++++++- sys/dev/bge/if_bge.c | 14 +++++++++++++- 2 files changed, 22 insertions(+), 2 deletions(-) -- You are receiving this mail because: You are on the CC list for the bug.home | help
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