From: Alejandro Lucero <alejandro.lucero@netronome.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.com>
Cc: Eelco Chaudron <echaudro@redhat.com>, dev <dev@dpdk.org>,
stable@dpdk.org, Maxime Coquelin <maxime.coquelin@redhat.com>,
Ferruh Yigit <ferruh.yigit@intel.com>
Subject: Re: [dpdk-stable] [PATCH v3 1/6] mem: add function for checking memsegs IOVAs addresses
Date: Tue, 10 Jul 2018 12:43:13 +0100 [thread overview]
Message-ID: <CAD+H993mkZc7uw_cZ6oHPh3mPbgSJzGTcSLzUtzg3hZz2S5aEQ@mail.gmail.com> (raw)
In-Reply-To: <33c605a8-cf16-b2f2-ce1d-cdc5d85bb155@intel.com>
On Tue, Jul 10, 2018 at 12:33 PM, Burakov, Anatoly <
anatoly.burakov@intel.com> wrote:
> On 10-Jul-18 12:14 PM, Eelco Chaudron wrote:
>
>>
>>
>> On 10 Jul 2018, at 12:52, Alejandro Lucero wrote:
>>
>> On Tue, Jul 10, 2018 at 11:06 AM, Eelco Chaudron <echaudro@redhat.com>
>>> wrote:
>>>
>>>
>>>>
>>>> On 10 Jul 2018, at 11:34, Alejandro Lucero wrote:
>>>>
>>>> On Tue, Jul 10, 2018 at 9:56 AM, Eelco Chaudron <echaudro@redhat.com>
>>>>
>>>>> wrote:
>>>>>
>>>>>
>>>>>
>>>>>> On 4 Jul 2018, at 14:53, Alejandro Lucero wrote:
>>>>>>
>>>>>> A device can suffer addressing limitations. This functions checks
>>>>>>
>>>>>> memsegs have iovas within the supported range based on dma mask.
>>>>>>>
>>>>>>> PMD should use this during initialization if supported devices
>>>>>>> suffer addressing limitations, returning an error if this function
>>>>>>> returns memsegs out of range.
>>>>>>>
>>>>>>> Another potential usage is for emulated IOMMU hardware with
>>>>>>> addressing
>>>>>>> limitations.
>>>>>>>
>>>>>>> Signed-off-by: Alejandro Lucero <alejandro.lucero@netronome.com>
>>>>>>> Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
>>>>>>> ---
>>>>>>> lib/librte_eal/common/eal_common_memory.c | 33
>>>>>>> ++++++++++++++++++++++++++++++
>>>>>>> lib/librte_eal/common/include/rte_memory.h | 3 +++
>>>>>>> lib/librte_eal/rte_eal_version.map | 1 +
>>>>>>> 3 files changed, 37 insertions(+)
>>>>>>>
>>>>>>> diff --git a/lib/librte_eal/common/eal_common_memory.c
>>>>>>> b/lib/librte_eal/common/eal_common_memory.c
>>>>>>> index fc6c44d..f5efebe 100644
>>>>>>> --- a/lib/librte_eal/common/eal_common_memory.c
>>>>>>> +++ b/lib/librte_eal/common/eal_common_memory.c
>>>>>>> @@ -109,6 +109,39 @@
>>>>>>> }
>>>>>>> }
>>>>>>>
>>>>>>> +/* check memseg iovas are within the required range based on dma
>>>>>>> mask
>>>>>>> */
>>>>>>> +int
>>>>>>> +rte_eal_check_dma_mask(uint8_t maskbits)
>>>>>>> +{
>>>>>>> +
>>>>>>> + const struct rte_mem_config *mcfg;
>>>>>>> + uint64_t mask;
>>>>>>> + int i;
>>>>>>> +
>>>>>>>
>>>>>>>
>>>>>>> I think we should add some sanity check to the input maskbits, i.e.
>>>>>> [64,0)
>>>>>> or [64, 32]? What would be a reasonable lower bound.
>>>>>>
>>>>>>
>>>>>> This is not a user's API, so any invocation will be reviewed, but I
>>>>>> guess
>>>>>>
>>>>> adding a sanity check here does not harm.
>>>>>
>>>>> Not sure about lower bound but upper should 64, although it does not
>>>>> make
>>>>> sense but it is safe. Lower bound is not so problematic.
>>>>>
>>>>>
>>>>>
>>>>> + /* create dma mask */
>>>>>>
>>>>>> + mask = ~((1ULL << maskbits) - 1);
>>>>>>> +
>>>>>>> + /* get pointer to global configuration */
>>>>>>> + mcfg = rte_eal_get_configuration()->mem_config;
>>>>>>> +
>>>>>>> + for (i = 0; i < RTE_MAX_MEMSEG; i++) {
>>>>>>> + if (mcfg->memseg[i].addr == NULL)
>>>>>>> + break;
>>>>>>>
>>>>>>>
>>>>>> Looking at some other code, it looks like NULL entries might exists.
>>>> So
>>>> should a continue; rather than a break; be used here?
>>>>
>>>>
>>>> I do not think so. memsegs are allocated sequentially, so first with
>>> addr
>>> as NULL implies no more memsegs.
>>>
>>
>> I was referring to the mem walk functions, rte_memseg_list_walk(). Maybe
>> some having more experience with this area can review/comment.
>>
>
> Pre-18.05, all memsegs are allocated continuously. Memseg lists and memseg
> list walk functions are 18.05+.
>
> Alejandro, perhaps it would be worth it to tag your patchset with
> "pre-18.05" to avoid similar confusion in the future?
>
>
Yes, that will help. I'm sending a new version shortly and I'll make it
clear.
> --
> Thanks,
> Anatoly
>
next prev parent reply other threads:[~2018-07-10 11:43 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-04 12:53 [dpdk-stable] [PATCH v3 0/6] use IOVAs check based on DMA mask Alejandro Lucero
2018-07-04 12:53 ` [dpdk-stable] [PATCH v3 1/6] mem: add function for checking memsegs IOVAs addresses Alejandro Lucero
2018-07-10 8:56 ` Eelco Chaudron
2018-07-10 9:34 ` Alejandro Lucero
2018-07-10 10:06 ` Eelco Chaudron
2018-07-10 10:52 ` Alejandro Lucero
2018-07-10 11:14 ` Eelco Chaudron
2018-07-10 11:33 ` Burakov, Anatoly
2018-07-10 11:43 ` Alejandro Lucero [this message]
2018-07-10 11:55 ` Eelco Chaudron
2018-07-10 11:40 ` Alejandro Lucero
2018-07-04 12:53 ` [dpdk-stable] [PATCH v3 2/6] ethdev: add function for checking IOVAs by a device Alejandro Lucero
2018-07-07 17:30 ` [dpdk-stable] [dpdk-dev] " Andrew Rybchenko
2018-07-10 8:57 ` [dpdk-stable] " Eelco Chaudron
2018-07-10 9:42 ` Alejandro Lucero
2018-07-10 9:44 ` Alejandro Lucero
2018-07-04 12:53 ` [dpdk-stable] [PATCH v3 3/6] bus/pci: use IOVAs check when setting IOVA mode Alejandro Lucero
2018-07-10 10:14 ` Eelco Chaudron
2018-07-10 15:37 ` Alejandro Lucero
2018-07-04 12:53 ` [dpdk-stable] [PATCH v3 4/6] mem: use address hint for mapping hugepages Alejandro Lucero
2018-07-10 11:15 ` Eelco Chaudron
2018-07-04 12:53 ` [dpdk-stable] [PATCH v3 5/6] net/nfp: check hugepages IOVAs based on DMA mask Alejandro Lucero
2018-07-10 10:17 ` Eelco Chaudron
2018-07-04 12:53 ` [dpdk-stable] [PATCH v3 6/6] net/nfp: support IOVA VA mode Alejandro Lucero
2018-07-10 10:18 ` Eelco Chaudron
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