From: Andrew Rybchenko <arybchenko@solarflare.com>
To: santosh <santosh.shukla@caviumnetworks.com>,
Olivier Matz <olivier.matz@6wind.com>
Cc: <dev@dpdk.org>, <stable@dpdk.org>, <jerin.jacob@caviumnetworks.com>
Subject: Re: [dpdk-stable] [RFC v2 01/17] mempool: fix phys contig check if populate default skipped
Date: Thu, 1 Feb 2018 09:54:35 +0300 [thread overview]
Message-ID: <b10db3a0-0b41-af79-279f-1a967823fe8d@solarflare.com> (raw)
In-Reply-To: <d68cb16b-bfe9-083b-a83e-e40b8eb5aaa0@caviumnetworks.com>
On 02/01/2018 08:05 AM, santosh wrote:
> On Wednesday 31 January 2018 10:15 PM, Olivier Matz wrote:
>> On Tue, Jan 23, 2018 at 01:15:56PM +0000, Andrew Rybchenko wrote:
>>> There is not specified dependency between rte_mempool_populate_default()
>>> and rte_mempool_populate_iova(). So, the second should not rely on the
>>> fact that the first adds capability flags to the mempool flags.
>>>
>>> Fixes: 65cf769f5e6a ("mempool: detect physical contiguous objects")
>>> Cc: stable@dpdk.org
>>>
>>> Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
>> Looks good to me. I agree it's strange that the mp->flags are
>> updated with capabilities only in rte_mempool_populate_default().
>> I see that this behavior is removed later in the patchset since the
>> get_capa() is removed!
>>
>> However maybe this single patch could go in 18.02.
>> +Santosh +Jerin since it's mostly about Octeon.
> rte_mempool_xmem_size should return correct size if MEMPOOL_F_CAPA_BLK_ALIGNED_OBJECTS flag
> is set in 'mp->flags'. Thats why _ops_get_capabilities() called in _populate_default() but not
> at _populate_iova().
> I think, this 'alone' patch may break octeontx mempool.
The patch does not touch rte_mempool_populate_default().
_ops_get_capabilities() is still called there before
rte_mempool_xmem_size(). The theoretical problem which
the patch tries to fix is the case when
rte_mempool_populate_default() is not called at all. I.e. application
calls _ops_get_capabilities() to get flags, then, together with
mp->flags, calls rte_mempool_xmem_size() directly, allocates
calculated amount of memory and calls _populate_iova().
Since later patches of the series reconsider memory size
calculation etc, it is up to you if it makes sense to apply it
in 18.02 as a fix.
next prev parent reply other threads:[~2018-02-01 6:54 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1511539591-20966-1-git-send-email-arybchenko@solarflare.com>
[not found] ` <1516713372-10572-1-git-send-email-arybchenko@solarflare.com>
2018-01-23 13:15 ` Andrew Rybchenko
2018-01-31 16:45 ` Olivier Matz
2018-02-01 5:05 ` santosh
2018-02-01 6:54 ` Andrew Rybchenko [this message]
2018-02-01 9:09 ` santosh
2018-02-01 9:18 ` [dpdk-stable] [dpdk-dev] " Andrew Rybchenko
2018-02-01 9:30 ` santosh
2018-02-01 10:00 ` Andrew Rybchenko
2018-02-01 10:14 ` Olivier Matz
2018-02-01 10:33 ` santosh
2018-02-01 14:02 ` Andrew Rybchenko
2018-02-01 10:17 ` santosh
2018-02-01 14:02 ` [dpdk-stable] [PATCH] " Andrew Rybchenko
2018-02-05 23:53 ` Thomas Monjalon
[not found] ` <1521994855-8808-1-git-send-email-arybchenko@solarflare.com>
2018-03-25 16:20 ` [dpdk-stable] [PATCH v2 01/11] mempool: fix memhdr leak when no objects are populated Andrew Rybchenko
[not found] ` <1522080591-24705-1-git-send-email-arybchenko@solarflare.com>
2018-03-26 16:09 ` [dpdk-stable] [PATCH v3 " Andrew Rybchenko
2018-04-06 15:50 ` Olivier Matz
[not found] ` <1523885080-17168-1-git-send-email-arybchenko@solarflare.com>
2018-04-16 13:24 ` [dpdk-stable] [PATCH v4 " Andrew Rybchenko
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