[dpdk-dev] [Bug 642] bnxt: jumbo packets fail with MBUF_FAST_FREE

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=642

            Bug ID: 642
           Summary: bnxt: jumbo packets fail with MBUF_FAST_FREE
           Product: DPDK
           Version: 20.11
          Hardware: x86
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: brian90013 at gmail.com
  Target Milestone: ---

Hello,

According to the bnxt tx_offload_capa, it supports
DEV_TX_OFFLOAD_MBUF_FAST_FREE. I enabled the flag along with
DEV_TX_OFFLOAD_MUTLI_SEGS and attempted to send jumbo (9000 byte payloads). I
see ~1000 packets a second being transferred.

When I comment out the MBUF_FAST_FREE (but leave MULTI_SEGS in) I see a more
reasonable 731Kpps / 52Gbps using the same single core.

I now exclude MBUF_FAST_FREE when running with a bnxt, but I would prefer to
discover why this combination doesn't work and fix it. Thank you for your help.

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