122 lines
4.3 KiB
Text
122 lines
4.3 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-EN-20:05.mlx5en Errata Notice
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The FreeBSD Project
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Topic: Fix packet forwarding performance in mlx5en(4) driver
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Category: core
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Module: mlx5en
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Announced: 2020-03-19
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Affects: FreeBSD 12.1
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Corrected: 2019-11-07 13:12:38 UTC (stable/12, 12.1-STABLE)
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2020-03-19 16:41:29 UTC (releng/12.1, 12.1-RELEASE-p3)
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For general information regarding FreeBSD Errata Notices and Security
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Advisories, including descriptions of the fields above, security
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branches, and the following sections, please visit
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<URL:https://security.FreeBSD.org/>.
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I. Background
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Add CSUM_SND_TAG flag and set this flag for outgoing ratelimited mbufs.
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This fixes an issue that redirected packets are dropped in the mlx5en
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transmit routine.
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II. Problem Description
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Ratelimiting support in the network stack reuses an mbuf field for a
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different purpose to avoid having to grow the mbuf size. This can a cause
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packet drop in the forwarding case if the field in question is not cleared
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prior to transmit.
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III. Impact
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All packets going through firewall code are dropped when using mlx5en(4).
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IV. Workaround
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No workaround is available. Systems not using mlx5en(4) are not affected.
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V. Solution
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Perform one of the following:
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1) To update your system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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# reboot
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2) To update your system via a source code patch:
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The following patches have been verified to apply to the applicable
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FreeBSD release branches.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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[FreeBSD 12.1]
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# fetch https://security.FreeBSD.org/patches/EN-20:05/mlx5en.patch
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# fetch https://security.FreeBSD.org/patches/EN-20:05/mlx5en.patch.asc
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# gpg --verify mlx5en.patch.asc
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b) Apply the patch. Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile your kernel as described in
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<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
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system.
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/12/ r354440
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releng/12.1/ r359136
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing NNNNNN with the revision number, on a
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machine with Subversion installed:
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# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing NNNNNN with the revision number:
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<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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<URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243871>
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The latest revision of this advisory is available at
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<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:05.mlx5en.asc>
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