Re: [dpdk-dev] [PATCH v3 0/4] fix creation of duplicate lpm and hash

["De Lara Guarch, Pablo" <pablo.de.lara.guarch@intel.com>]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Olivier Matz
> Sent: Tuesday, April 05, 2016 12:54 PM
> To: dev@dpdk.org
> Cc: Richardson, Bruce; De Lara Guarch, Pablo
> Subject: [dpdk-dev] [PATCH v3 0/4] fix creation of duplicate lpm and hash
> 
> Seen while trying to fix the func_reentrancy autotest. The
> series addresses several issues:
> 
> 1/ Hash and lpm return a pointer to an existing object if the user requests the
>    creation with an already existing name. This look dangerous: when an
> object
>    is returned, the user does not know if it should be freed or not.
> 
> 2/ There is a race condition in cuckoo_hash as the lock is not held in
>    rte_hash_create(). We could find some cases where NULL is returned when
> the
>    object already exists (ex: when rte_ring_create() fails).
> 
> 3/ There is a race condition func_reentrancy that can fail even if the tested
>    API behaves correctly.
> 
> 
> RFC -> v1:
> 
> - split the patch in 4 patches
> - on error, set rte_errno to EEXIST when relevant
> - fix locking in cuckoo_hash creation
> 
> v1 -> v2:
> 
> - fix compilation issue in cuckoo hash
> - update the hash test to conform to the new behavior
> - rework locking modification in cuckoo_hash
> - passed autotests: hash, lpm, lpm6, func_reentrancy
> 
> v2 -> v3:
> 
> - rebase against head
> - add "Fixes:" in commit messages
> - properly set lpm or hash pointers to NULL on error before returning
> 
> Olivier Matz (4):
>   lpm: allocation of an existing object should fail
>   hash: allocation of an existing object should fail
>   hash: keep the list locked at creation
>   autotest: fix func reentrancy
> 
>  app/test/test_func_reentrancy.c   | 31 +++++++++++------
>  app/test/test_hash.c              | 65 +++++++++++++----------------------
>  app/test/test_lpm6.c              |  2 +-
>  lib/librte_hash/rte_cuckoo_hash.c | 72 +++++++++++++++++++++++------------
> ----
>  lib/librte_hash/rte_fbk_hash.c    |  5 ++-
>  lib/librte_lpm/rte_lpm.c          | 10 ++++--
>  lib/librte_lpm/rte_lpm6.c         |  5 ++-
>  7 files changed, 103 insertions(+), 87 deletions(-)
> 
> --
> 2.1.4

I wonder if you should include something in release notes.
We are fixing the API, so I guess we don't need to follow the deprecation process, but at least a note in the documentation?

Apart from that,

Series-acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>

Thanks!