[Bug 934] crypto_aesni_mb PMD found crash in access mb_mgr on primary process after secondary process launch scan/probe

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=934

            Bug ID: 934
           Summary: crypto_aesni_mb PMD found crash in access mb_mgr on
                    primary process after secondary process launch
                    scan/probe
           Product: DPDK
           Version: 20.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: cryptodev
          Assignee: dev at dpdk.org
          Reporter: changchun.zhang at oracle.com
  Target Milestone: ---

This is a bug for AESNI_MB PMD in DPDK 20.11. The issue may have been resolved
in latest DPDK, but wondering if a patch can be applied for 20.11.

The AESNI_MB PMD in DPDK 20.11 does not work well in supporting multi-process.
The crash can be seen by this sequence:
1. The crypto_aesni_mb is started successfuly on primary process by
rte_vdev_init. 
2. The secondary process launches the scanning/prob procedure and the primary
process received the sync req and replied the secondary process. The
crypto_aesni_mb is also started by the probe on receiving the reply of the
vdev_scan.
3. On primary process, the packet process tries to create the crypto session
and it crashes on accessing the mb_mgr of dev->data->dev_private, in
aesni_mb_set_session_auth_parameters()

It is found in cryptodev_aesni_mb_create(), 
mb_mgr = alloc_init_mb_mgr(vector_mode);
can be triggered on both primary process and second process. Thus after the
device is started on primary, the dev->data->dev_private->mb_mgr can be updated
when second process started the device again. This is incorrect. 

The mb_mgr allocation should be limited to primary process. The same should be
applied to the qp->mb_mgr when setup the queue pair.

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