From: Olivier Matz <olivier.matz@6wind.com>
To: dev@dpdk.org
Cc: "Richardson, Bruce" <bruce.richardson@intel.com>
Subject: Re: [dpdk-dev] [RFC] hash/lpm: return NULL if the object exists
Date: Fri, 25 Mar 2016 11:32:47 +0100 [thread overview]
Message-ID: <56F513CF.4090604@6wind.com> (raw)
In-Reply-To: <1458044745-32764-1-git-send-email-olivier.matz@6wind.com>
Hi Bruce,
On 03/15/2016 01:25 PM, Olivier Matz wrote:
> Seen by trying to fix the func_reentrancy autotest. The test
> was doing the following on several cores in parallel:
>
> name = "common_name";
> do several times {
> obj = allocate_an_object(name) // obj = ring, mempool, hash, lpm, ...
> if (obj == NULL && lookup(name) == NULL)
> return TEST_FAIL;
> }
>
> Issues:
>
> 1/ rings, mempools, hashs API are not coherent
> rings and mempool return NULL if the object does not exist
> hash and lpm return an object that was allocated allocated if
> it already was allocated
>
> 2/ The hash/lpm API looks dangerous: when an object is returned,
> the user does not know if it should be freed or not (no refcnt)
>
> 3/ There are some possible race conditions 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).
>
> This patch tries to rationalize the APIs of lpm and hash.
>
> Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Sorry, I forgot to CC you in the first mail. Do you have any opinion
about this rfc patch?
Thanks,
Olivier
next prev parent reply other threads:[~2016-03-25 10:32 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-15 12:25 Olivier Matz
2016-03-25 10:32 ` Olivier Matz [this message]
2016-03-25 10:45 ` Bruce Richardson
2016-03-30 15:30 ` [dpdk-dev] [PATCH 0/4] fix lpm and hash creation Olivier Matz
2016-03-30 15:30 ` [dpdk-dev] [PATCH 1/4] lpm: allocation of an existing object should fail Olivier Matz
2016-03-30 21:46 ` Stephen Hemminger
2016-03-31 7:35 ` Olivier Matz
2016-04-01 16:25 ` Olivier Matz
2016-03-31 10:55 ` Bruce Richardson
2016-03-30 15:30 ` [dpdk-dev] [PATCH 2/4] hash: " Olivier Matz
2016-03-30 15:30 ` [dpdk-dev] [PATCH 3/4] hash: keep the list locked at creation Olivier Matz
2016-03-30 15:30 ` [dpdk-dev] [PATCH 4/4] autotest: fix func reentrancy Olivier Matz
2016-03-31 7:35 ` [dpdk-dev] [PATCH 0/4] fix lpm and hash creation Olivier Matz
2016-04-05 7:35 ` [dpdk-dev] [PATCH v2 0/4] fix creation of duplicate lpm and hash Olivier Matz
2016-04-05 7:35 ` [dpdk-dev] [PATCH v2 1/4] lpm: allocation of an existing object should fail Olivier Matz
2016-04-05 7:35 ` [dpdk-dev] [PATCH v2 2/4] hash: " Olivier Matz
2016-04-05 7:35 ` [dpdk-dev] [PATCH v2 3/4] hash: keep the list locked at creation Olivier Matz
2016-04-05 11:05 ` De Lara Guarch, Pablo
2016-04-05 7:35 ` [dpdk-dev] [PATCH v2 4/4] autotest: fix func reentrancy Olivier Matz
2016-04-05 11:00 ` De Lara Guarch, Pablo
2016-04-05 11:53 ` [dpdk-dev] [PATCH v3 0/4] fix creation of duplicate lpm and hash Olivier Matz
2016-04-05 11:53 ` [dpdk-dev] [PATCH v3 1/4] lpm: allocation of an existing object should fail Olivier Matz
2016-04-05 11:53 ` [dpdk-dev] [PATCH v3 2/4] hash: " Olivier Matz
2016-04-05 11:53 ` [dpdk-dev] [PATCH v3 3/4] hash: keep the list locked at creation Olivier Matz
2016-04-05 11:53 ` [dpdk-dev] [PATCH v3 4/4] autotest: fix func reentrancy Olivier Matz
2016-04-05 15:51 ` [dpdk-dev] [PATCH v3 0/4] fix creation of duplicate lpm and hash Thomas Monjalon
2016-04-06 10:11 ` De Lara Guarch, Pablo
2016-04-06 10:32 ` De Lara Guarch, Pablo
2016-04-06 11:14 ` Olivier Matz
2016-04-06 11:20 ` De Lara Guarch, Pablo
2016-04-06 11:57 ` Olivier Matz
2016-04-06 13:27 ` [dpdk-dev] [PATCH v4 " Olivier Matz
2016-04-06 13:27 ` [dpdk-dev] [PATCH v4 1/4] lpm: allocation of an existing object should fail Olivier Matz
2016-04-06 13:27 ` [dpdk-dev] [PATCH v4 2/4] hash: " Olivier Matz
2016-04-06 13:28 ` [dpdk-dev] [PATCH v4 3/4] hash: keep the list locked at creation Olivier Matz
2016-04-06 13:28 ` [dpdk-dev] [PATCH v4 4/4] autotest: fix func reentrancy Olivier Matz
2016-04-06 15:31 ` [dpdk-dev] [PATCH v4 0/4] fix creation of duplicate lpm and hash Thomas Monjalon
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