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From: bugzilla@dpdk.org
To: dev@dpdk.org
Subject: [Bug 1117] af-packet driver fix breaks rte_pktmbuf_prepend()
Date: Thu, 27 Oct 2022 19:00:33 +0000
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X-Bugzilla-Product: DPDK
X-Bugzilla-Component: ethdev
X-Bugzilla-Version: 21.11
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X-Bugzilla-Who: bly454@gmail.com
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https://bugs.dpdk.org/show_bug.cgi?id=3D1117
Bug ID: 1117
Summary: af-packet driver fix breaks rte_pktmbuf_prepend()
Product: DPDK
Version: 21.11
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: ethdev
Assignee: dev@dpdk.org
Reporter: bly454@gmail.com
Target Milestone: ---
The following commit causes rte_pktmbuf_prepend() to fail when prepending t=
he
full headroom reserved when creating the mbuf pool.
https://git.dpdk.org/dpdk-stable/commit/?h=3D21.11&id=3Dd41d39bcf76900deb6a=
a000e929fd65734254201
Of issue is if the received frame was originally tagged (and vlan-stripped =
by
af-socket connection) the above commit does a vlan reinsert action as part =
of
eth_af_packet_rx(). This moves the SOF forward into the "reserved" space by
four bytes. For example, if the reserved space was 128 bytes and the next s=
tage
of processing is a generic pipeline handling a variety of interface types, =
the
generic prepend of the reserved 128-byte meta-data space will fail. This me=
ans
you cannot use a common pipeline and have to have an exception now for
af-packet rx handling as compared to physical NIC, tap, vhost, etc. Ideally,
the initial SOF offset should be consistent relative to your design's reser=
ved
headroom, regardless of the vlan tagged status of the frame or the interface
type it was received on.
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