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From: bugzilla@dpdk.org
To: dev@dpdk.org
Subject: [Bug 949] net/mlx5: errors when sending from extbuf pool
Date: Fri, 04 Mar 2022 13:41:53 +0000
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https://bugs.dpdk.org/show_bug.cgi?id=3D949

            Bug ID: 949
           Summary: net/mlx5: errors when sending from extbuf pool
           Product: DPDK
           Version: 21.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: bmerry@sarao.ac.za
  Target Milestone: ---

Created attachment 193
  --> https://bugs.dpdk.org/attachment.cgi?id=3D193&action=3Dedit
Example code

Given the lack of documentation it's likely that I'm just holding it wrong,=
 but
I'm having trouble when trying to transmit segmented packets where one of t=
he
segments is from a pool created with rte_pktmbuf_pool_create_extbuf.

I've reduced my test to the attached program. The test builds and transmits
multicast UDP (IPv4) frames. The L2-L4 headers are in a regular mbuf, chain=
ed
to a separate mbuf holding the payload. If the USE_EXTERNAL define at the t=
op
is changed to 0, the payload mbuf is a boring standard mbuf, and everything
works and I can receive the packets on another machine. When USE_EXTERNAL=
=3D1, a
single huge page is allocated with mmap, then used to back the mempool for
payloads (via rte_pktmbuf_pool_create_extbuf). In this case, I get a whole
bunch of files written with names like
dpdk_mlx5_port_0_txq_0_index_0_1383899876, reporting CQ and SQ errors, and I
don't receive the packets (and the tx ethtool counters don't go up).

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