[dpdk-dev] [Bug 494] rte_pktmbuf_pool_create returns EINVAL instead of ENOMEM in rte_errno when not enough huge pages memory

[dpdk-dev] [Bug 494] rte_pktmbuf_pool_create returns EINVAL instead of ENOMEM in rte_errno when not enough huge pages memory

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=494

            Bug ID: 494
           Summary: rte_pktmbuf_pool_create returns EINVAL instead of
                    ENOMEM in rte_errno when not enough huge pages memory
           Product: DPDK
           Version: 19.11
          Hardware: All
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev@dpdk.org
          Reporter: alexander.pshenichnikov@gmail.com
  Target Milestone: ---

DPDK: dpdk-stable-19.11.3
GCC: Ubuntu 7.5.0-3ubuntu1~18.04
OS: Ubuntu 18.04 LTS


Steps to reproduce:

1. Allocate total 32 huge pages of size 2048K

echo 32 >
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages

2. Request testpmd to create 32768 mbufs

./build/app/testpmd -c7 --vdev=net_pcap,iface=net0 -- -i --nb-cores=1
--nb-ports=1 --total-num-mbufs=32768

3. Notice 'Invalid argument' in error description

testpmd: preferred mempool ops selected: ring_mp_mc
EAL: Error - exiting with code: 1
  Cause: Creation of mbuf pool for socket 0 failed: Invalid argument


Expected result:

Error message should say 
"Cause: Creation of mbuf pool for socket 0 failed: Cannot allocate memory"

i.e rte_errno should be EINVAL 

Suspected commit:

commit 3a3d0c75b43e8d1670c5ea6bf85cb3e1e60dfa2b
Author: Olivier Matz <olivier.matz@6wind.com>
Date:   Fri Jan 17 10:51:49 2020 +0100

    mempool: fix slow allocation of large pools

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