[EXTERNAL] [PATCH] app/test-crypto-perf: reset mbuf state for IPsec outbound iterations

[Nithinsen Kaithakadan]

> In cperf_set_ops_security_ipsec(), the same mbuf is reused across multiple
> throughput iterations.  For outbound (encap) IPsec the PMD may modify
> mbuf metadata such as data_off, data_len and pkt_len as part of in-place
> protocol processing.  When the mbuf is recycled for the next burst those
> modifications must be undone so the PMD always sees a clean, freshly-
> allocated-like buffer.
> 
> Use rte_pktmbuf_reset() to restore the mbuf to its post-alloc state in a PMD-
> agnostic manner, rather than patching individual fields with driver-specific
> knowledge of the expected offset values.
> 
> Without this reset, drivers that back-adjust data_off after encap (e.g. DPAA2
> SEC, which advances data_off by SEC_FLC_DHR_OUTBOUND on each
> dequeue) will receive a buffer with insufficient headroom on the second and
> subsequent enqueues, causing hardware errors such as:
> 
>   DPAA2_SEC: SEC encap returned Error - 50000045
>     (QI error 0x45: DHR correction underflow, reuse mode)
>   DPAA2_SEC: SEC returned Error - 50000020
>     (QI error 0x20: FD format error)
> 
> Fixes: 3b7d9f2bc6 ("app/test-crypto-perf: add ipsec lookaside support")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Gagandeep Singh <g.singh at nxp.com>
> ---


Acked-by: Nithinsen Kaithakadan <nkaithakadan at marvell.com>