[dpdk-dev] [PATCH v3 0/4] fix creation of duplicate lpm and hash
De Lara Guarch, Pablo
pablo.de.lara.guarch at intel.com
Wed Apr 6 12:32:51 CEST 2016
> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Olivier Matz
> Sent: Tuesday, April 05, 2016 12:54 PM
> To: dev at 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 at intel.com>
Thanks!
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