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From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Yasufumi Ogawa <yasufum.o@gmail.com>,
	David Marchand <david.marchand@redhat.com>
Cc: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	dev <dev@dpdk.org>,  dpdk stable <stable@dpdk.org>,
	Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>
Subject: Re: [dpdk-dev] [PATCH v7 1/1] fbarray: fix duplicated fbarray file in secondary
Date: Wed, 27 Nov 2019 10:26:17 +0000
Message-ID: <a5a6a7a1-99a0-94e8-8a86-00fb07f2b432@intel.com> (raw)
In-Reply-To: <bf8ddd01-78aa-18c0-1442-fcd1ab9f5164@gmail.com>

On 26-Nov-19 7:40 PM, Yasufumi Ogawa wrote:
> Hi David,
> 
> Sorry for slow reply.
> 
> On 2019/11/14 21:27, David Marchand wrote:
>> On Thu, Nov 14, 2019 at 12:42 PM Yasufumi Ogawa <yasufum.o@gmail.com> 
>> wrote:
>>>
>>> On 2019/11/14 2:01, Burakov, Anatoly wrote:
>>>> On 13-Nov-19 9:43 PM, yasufum.o@gmail.com wrote:
>>>>> From: Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>
>>>>>
>>>>> In secondary_msl_create_walk(), it creates a file for fbarrays with 
>>>>> its
>>>>> PID for reserving unique name among secondary processes. However, it
>>>>> does not work if several secondaries run as app containers because 
>>>>> each
>>>>> of containerized secondary has PID 1, and failed to reserve unique 
>>>>> name
>>>>> other than first one. To reserve unique name in each of containers, 
>>>>> use
>>>>> hostname in addition to PID.
>>>>>
>>>>> Cc: stable@dpdk.org
>>>>>
>>>>> Signed-off-by: Yasufumi Ogawa <yasufum.o@gmail.com>
>>>>> ---
>>>>>    lib/librte_eal/linux/eal/eal_memalloc.c | 16 +++++++++++++---
>>>>>    1 file changed, 13 insertions(+), 3 deletions(-)
>>>>>
>>>>> diff --git a/lib/librte_eal/linux/eal/eal_memalloc.c
>>>>> b/lib/librte_eal/linux/eal/eal_memalloc.c
>>>>> index af6d0d023..11de6d4d6 100644
>>>>> --- a/lib/librte_eal/linux/eal/eal_memalloc.c
>>>>> +++ b/lib/librte_eal/linux/eal/eal_memalloc.c
>>>>> @@ -1365,6 +1365,12 @@ secondary_msl_create_walk(const struct
>>>>> rte_memseg_list *msl,
>>>>>        struct rte_memseg_list *primary_msl, *local_msl;
>>>>>        char name[PATH_MAX];
>>>>>        int msl_idx, ret;
>>>>> +    char hostname[HOST_NAME_MAX+1] = { 0 };
>>>>> +    /* filename of secondary's fbarray is defined such as
>>>>> +     * "fbarray_memseg-1048576k-0-0_PID_HOSTNAME" and length of PID
>>>>> +     * can be 7 digits maximumly.
>>>>> +     */
>>>>> +    int fbarray_sec_name_len = 32 + 7 + 1 + HOST_NAME_MAX + 1;
>>>>
>>>> What does 32 stand for? Maybe #define both 32 and 7 values?
>>> Hi Anatoly,
>>>
>>> Thank you for your comments! If my understanding is correct, the prefix
>>> "fbarray_memseg-1048576k-0-0_" is 28 digits and it could be larger if
>>> using the size of hugepage or the number of NUMA nodes are larger
>>> possibly. However, I think 32 digits is still enough.
>>>
>>>   > Maybe #define both 32 and 7 values?
>>> Yes. I think it should be better to use #define if this values are
>>> referred several times.
>>
>>
>> We can truncate to RTE_FBARRAY_NAME_LEN in all cases.
>> And iiuc, rte_fbarray_init will refuse any longer name anyway.
> Could I confirm the issue? I've understood that it is failed to validate 
> the name of fbarray in fully_validate() at 
> "lib/librte_eal/common/eal_common_fbarray.c:697".
> 
> static int
> fully_validate(const char *name, unsigned int elt_sz, unsigned int len)
> {
>          if (name == NULL || elt_sz == 0 || len == 0 || len > INT_MAX) {
>                  rte_errno = EINVAL;
>                  return -1;
>          }
> 
>          if (strnlen(name, RTE_FBARRAY_NAME_LEN) == RTE_FBARRAY_NAME_LEN) {
>                  rte_errno = ENAMETOOLONG;
>                  return -1;
>          }
>          return 0;
> }
> 
> I should overwrite the definition of RTE_FBARRAY_NAME_LEN as previous 
> patch in this case, and it causes an ABI breakage, right? If so, I would 
> like to make the change and give up to update stable release.
> 
> Thanks,
> Yasufumi
> 

It seems we're getting into bikeshedding...

We can do this without ABI breakage. You could have just used 
RTE_FBARRAY_NAME_LEN as max fbarray name length for fbarray_sec_name_len 
(i.e. that would include hostname + pid + whatever else there is). The 
name, as David has pointed out, would be truncated to 
RTE_FBARRAY_NAME_LEN anyway (or, more precisely, it will be refused if 
it's longer than that), so this is the most you can have - so you can 
just use that as the maximum.

-- 
Thanks,
Anatoly

  reply index

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-16  1:59 [dpdk-dev] [PATCH] fbarray: get fbarrays from containerized secondary ogawa.yasufumi
2019-04-16  3:43 ` [dpdk-dev] [PATCH v2 0/1] Get " ogawa.yasufumi
2019-04-16  3:43   ` [dpdk-dev] [PATCH v2 1/1] fbarray: get " ogawa.yasufumi
2019-07-04 20:17     ` Thomas Monjalon
2019-07-05  8:53     ` Burakov, Anatoly
2019-07-09 10:22       ` Yasufumi Ogawa
2019-07-09 10:24         ` Burakov, Anatoly
2019-07-09 10:26           ` Burakov, Anatoly
2019-07-11  9:37             ` Yasufumi Ogawa
2019-07-11  9:43               ` Burakov, Anatoly
2019-07-11 10:31 ` [dpdk-dev] [PATCH v3 0/1] " yasufum.o
2019-07-11 10:31   ` [dpdk-dev] [PATCH v3 1/1] " yasufum.o
2019-07-11 10:53     ` Burakov, Anatoly
2019-07-11 11:57       ` Yasufumi Ogawa
2019-07-11 13:14         ` Burakov, Anatoly
2019-07-12  2:22           ` Yasufumi Ogawa
2019-07-22  1:06             ` Ogawa Yasufumi
2019-07-22  9:33               ` Burakov, Anatoly
2019-07-22  9:25             ` Burakov, Anatoly
2019-07-24  8:20   ` [dpdk-dev] [PATCH v4 0/1] " yasufum.o
2019-07-24  8:20     ` [dpdk-dev] [PATCH v4 1/1] " yasufum.o
2019-07-24  9:59       ` Burakov, Anatoly
2019-07-30  8:16         ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2019-07-30  9:18           ` Burakov, Anatoly
2019-07-31  5:48             ` Yasufumi Ogawa
2019-10-11  9:36       ` [dpdk-dev] " David Marchand
2019-10-25 15:36         ` David Marchand
2019-10-25 19:54           ` Yasufumi Ogawa
2019-10-26 16:15             ` David Marchand
2019-10-26 18:11               ` Yasufumi Ogawa
2019-10-28  8:07     ` [dpdk-dev] [PATCH v5 0/1] fbarray: fix duplicated fbarray file in secondary yasufum.o
2019-10-28  8:07       ` [dpdk-dev] [PATCH v5 1/1] " yasufum.o
2019-10-29 12:03         ` Ananyev, Konstantin
2019-10-30 13:42           ` Yasufumi Ogawa
2019-10-30 19:00             ` Ananyev, Konstantin
2019-10-31 10:03               ` Yasufumi Ogawa
2019-10-31 10:32                 ` Ananyev, Konstantin
2019-11-01  9:04     ` [dpdk-dev] [PATCH v6 0/1] " yasufum.o
2019-11-01  9:04       ` [dpdk-dev] [PATCH v6 1/1] " yasufum.o
2019-11-01 12:01         ` Ananyev, Konstantin
2019-11-04 10:20         ` Burakov, Anatoly
2019-11-05 10:13           ` David Marchand
2019-11-05 11:31             ` Burakov, Anatoly
2019-11-05 11:41               ` Ananyev, Konstantin
2019-11-06 10:37                 ` Burakov, Anatoly
2019-11-08  3:19                   ` Yasufumi Ogawa
2019-11-13 21:43     ` [dpdk-dev] [PATCH v7 0/1] " yasufum.o
2019-11-13 21:43       ` [dpdk-dev] [PATCH v7 1/1] " yasufum.o
2019-11-14 10:01         ` Burakov, Anatoly
2019-11-14 11:42           ` Yasufumi Ogawa
2019-11-14 12:27             ` David Marchand
2019-11-26 19:40               ` Yasufumi Ogawa
2019-11-27 10:26                 ` Burakov, Anatoly [this message]
2019-11-29  5:44                   ` Yasufumi Ogawa
2019-12-02 10:43                     ` Burakov, Anatoly
2019-12-05 20:13                       ` Yasufumi Ogawa
2019-11-14 12:55         ` David Marchand
2019-11-14 17:32         ` Ananyev, Konstantin
2019-11-27  8:48       ` [dpdk-dev] [PATCH v8 0/1] " Yasufumi Ogawa
2019-11-27  8:48         ` [dpdk-dev] [PATCH v8 1/1] " Yasufumi Ogawa
2019-12-06 10:44           ` Burakov, Anatoly
2019-12-06 13:18             ` Yasufumi Ogawa

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