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Date:      Thu, 16 Oct 2014 21:29:42 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-net@FreeBSD.org
Subject:   [Bug 194314] [ixgbe] driver makes some dangerous assumptions with struct mbuf sizing with IXGBE_RX_COPY_LEN
Message-ID:  <bug-194314-2472-tMA3Ii7fuw@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-194314-2472@https.bugs.freebsd.org/bugzilla/>
References:  <bug-194314-2472@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194314

--- Comment #7 from Garrett Cooper <ngie@FreeBSD.org> ---
(In reply to Eric Joyner from comment #6)
> Does that mean only the sizes of struct m_hdr and struct m_pkthdr change, or
> do you change MSIZE as well?

The size of struct m_ext and struct m_hdr is larger than stock FreeBSD, with
certain compile-time options.

However, you can technically tweak MSIZE though so it's less than 160, which
would also reproduce the situation. That scenario seems kind of silly though.

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