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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Chengchang Tang <tangchengchang@huawei.com>,
	"Wei Hu (Xavier)" <huwei013@chinasoftinc.com>
Cc: dev@dpdk.org, xavier.huwei@huawei.com
Subject: Re: [dpdk-dev] [PATCH v3 3/6] app/testpmd: remove restriction on txpkts set
Date: Thu, 24 Sep 2020 13:19:29 +0100
Message-ID: <f9f19d3d-63a9-1f76-688c-a175711b7e9c@intel.com> (raw)
In-Reply-To: <fb1c961e-f944-694d-0153-1f9be7dfdcc4@huawei.com>

On 9/24/2020 7:08 AM, Chengchang Tang wrote:
> 
> 
> On 2020/9/24 0:59, Ferruh Yigit wrote:
>> On 9/23/2020 12:57 PM, Wei Hu (Xavier) wrote:
>>> Hi, Ferruh Yigit
>>>
>>> On 2020/9/23 11:14, Wei Hu (Xavier) wrote:
>>>> Hi, Ferruh Yigit
>>>>
>>>> On 2020/9/22 22:51, Ferruh Yigit wrote:
>>>>> On 9/19/2020 11:47 AM, Wei Hu (Xavier) wrote:
>>>>>> From: Chengchang Tang <tangchengchang@huawei.com>
>>>>>>
>>>>>> Currently, if nb_txd is not set, the txpkts is not allowed to be set
>>>>>> because the nb_txd is used to avoid the numer of segments exceed the Tx
>>>>>> ring size and the default value of nb_txd is 0. And there is a bug that
>>>>>> nb_txd is the global configuration for Tx ring size and the ring size
>>>>>> could be changed by some command per queue. So these valid check is
>>>>>> unreliable and introduced unnecessary constraints.
>>>>>>
>>>>>> This patch adds a valid check function to use the real Tx ring size to
>>>>>> check the validity of txpkts.
>>>>>>
>>>>>> Fixes: af75078fece3 ("first public release")
>>>>>> Cc: stable@dpdk.org
>>>>>>
>>>>>> Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
>>>>>> Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
>>>>>> ---
> 
> <...>
> 
>>>>> What do you think calling 'rte_eth_rx_queue_info_get()' & 'rte_eth_tx_queue_info_get()' to get the 'nb_desc'?
>>>>
>>>> Currently not all PMD driver implement the .rxq_info_get and
>>>>
>>>> .txq_info_get hook function. If calling rte_eth_rx_queue_info_get
>>>>
>>>> return -ENOSTUP, we still need to obtain the ring_size in this way.
>>>>
>>> If calling rte_eth_rx_queue_info_get function get ring_size, because not all PMDS implement the relevant the related hook function, we need to
>>> check the return value and if the return value is -ENOSTUP, we must obtain the ring_size in this way.
>>> Do you prefer this method, right?
>>>
>>
>> Do we really need this check?
> 
> IMHO, these checks are needed. There are two patches use the same method to obtain the ring_size to implement the
> verification in the patch set. One is used to verify the validity of the descriptor ID in the ring. Another is used
> to avoid the number of segments configuration won't exceed the ring_size. For the first case, if no check is
> performed, memory out of bound may occur. For the another one, if no check is performed, the sending may fail when
> the number of segment exceed the ring size.
>>
>> What about verifying 'ring_size' if 'rte_eth_rx_queue_info_get()' returns a valid info, if not ignore the check?
>>
> 
> if we ignore the check when the 'rte_eth_rx_queue_info_get()' returns -ENOTSUP, it may still cause an illegal memory
> access or sending failure.
 >

Ok, thanks for clarification, agree to your suggestion. (to check 
'rte_eth_rx_queue_info_get()' return value and if it is '-ENOSTUP' 
calculate the 'ring_size' as above.)


  reply	other threads:[~2020-09-24 12:25 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-18 12:02 [dpdk-dev] [PATCH 0/4] minor fixes for testpmd Wei Hu (Xavier)
2020-08-18 12:02 ` [dpdk-dev] [PATCH 1/4] app/testpmd: fix missing verification of port id Wei Hu (Xavier)
2020-08-18 12:02 ` [dpdk-dev] [PATCH 2/4] app/testpmd: fix VLAN offload configuration when config fail Wei Hu (Xavier)
2020-08-18 12:02 ` [dpdk-dev] [PATCH 3/4] app/testpmd: fix packet header in txonly mode Wei Hu (Xavier)
2020-08-18 12:02 ` [dpdk-dev] [PATCH 4/4] app/testpmd: fix displaying Rx Tx queues information Wei Hu (Xavier)
2020-08-20  1:42 ` [dpdk-dev] [PATCH v2 0/4] minor fixes for testpmd Wei Hu (Xavier)
2020-08-20  1:42   ` [dpdk-dev] [PATCH v2 1/4] app/testpmd: fix missing verification of port id Wei Hu (Xavier)
2020-09-14 16:13     ` Ferruh Yigit
2020-08-20  1:42   ` [dpdk-dev] [PATCH v2 2/4] app/testpmd: fix VLAN offload configuration when config fail Wei Hu (Xavier)
2020-09-14 16:13     ` Ferruh Yigit
2020-08-20  1:42   ` [dpdk-dev] [PATCH v2 3/4] app/testpmd: fix packet header in txonly mode Wei Hu (Xavier)
2020-09-14 16:23     ` Ferruh Yigit
2020-09-17  7:10       ` Chengchang Tang
2020-09-17 11:16         ` Ferruh Yigit
2020-09-17 11:48           ` Chengchang Tang
2020-08-20  1:42   ` [dpdk-dev] [PATCH v2 4/4] app/testpmd: fix displaying Rx Tx queues information Wei Hu (Xavier)
2020-09-14 16:31     ` Ferruh Yigit
2020-09-16  9:23       ` Wei Hu (Xavier)
2020-09-16 15:58         ` Ferruh Yigit
2020-09-03  3:19   ` [dpdk-dev] [PATCH v2 0/4] minor fixes for testpmd Wei Hu (Xavier)
2020-09-19 10:47 ` [dpdk-dev] [PATCH v3 0/6] " Wei Hu (Xavier)
2020-09-19 10:47   ` [dpdk-dev] [PATCH v3 1/6] app/testpmd: fix missing verification of port id Wei Hu (Xavier)
2020-09-22 14:49     ` Ferruh Yigit
2020-09-19 10:47   ` [dpdk-dev] [PATCH v3 2/6] app/testpmd: fix VLAN offload configuration when config fail Wei Hu (Xavier)
2020-09-19 10:47   ` [dpdk-dev] [PATCH v3 3/6] app/testpmd: remove restriction on txpkts set Wei Hu (Xavier)
2020-09-22 14:51     ` Ferruh Yigit
2020-09-23  3:14       ` Wei Hu (Xavier)
2020-09-23 11:57         ` Wei Hu (Xavier)
2020-09-23 16:59           ` Ferruh Yigit
2020-09-24  6:08             ` Chengchang Tang
2020-09-24 12:19               ` Ferruh Yigit [this message]
2020-09-19 10:47   ` [dpdk-dev] [PATCH v3 4/6] app/testpmd: fix packet header in txonly mode Wei Hu (Xavier)
2020-09-19 10:47   ` [dpdk-dev] [PATCH v3 5/6] app/testpmd: fix valid desc id check Wei Hu (Xavier)
2020-09-22 14:53     ` Ferruh Yigit
2020-09-19 10:47   ` [dpdk-dev] [PATCH v3 6/6] app/testpmd: fix displaying Rx Tx queues information Wei Hu (Xavier)
2020-09-25 12:47 ` [dpdk-dev] [PATCH v4 0/6] minor fixes for testpmd Wei Hu (Xavier)
2020-09-25 12:47   ` [dpdk-dev] [PATCH v4 1/6] app/testpmd: fix missing verification of port id Wei Hu (Xavier)
2020-09-25 12:47   ` [dpdk-dev] [PATCH v4 2/6] app/testpmd: fix VLAN offload configuration when config fail Wei Hu (Xavier)
2020-09-25 12:47   ` [dpdk-dev] [PATCH v4 3/6] app/testpmd: remove restriction on txpkts set Wei Hu (Xavier)
2020-11-23 11:50     ` Slava Ovsiienko
2020-11-24 10:27       ` Thomas Monjalon
2020-11-24 12:23         ` Ferruh Yigit
2020-11-24 13:01           ` Kevin Traynor
2020-11-25 14:06           ` Ferruh Yigit
2020-11-26  7:24             ` Slava Ovsiienko
2020-11-26 12:38               ` Ferruh Yigit
2020-11-27 13:05                 ` Slava Ovsiienko
2020-12-02 12:07                   ` Ferruh Yigit
2020-12-03  9:45                     ` Slava Ovsiienko
2020-12-03 10:18                       ` Ferruh Yigit
2020-12-11 15:07                         ` [dpdk-dev] [PATCH] app/testpmd: fix segment number check Viacheslav Ovsiienko
2020-12-11 16:00                           ` Andrew Boyer
2020-12-11 16:14                             ` Slava Ovsiienko
2020-12-16 12:12                               ` Ferruh Yigit
2020-12-16 12:33                                 ` Slava Ovsiienko
2020-12-16 12:36                           ` Ferruh Yigit
2021-04-23 16:09                           ` [dpdk-dev] [PATCH v2] " Ferruh Yigit
2021-04-26 11:23                             ` Li, Xiaoyun
2021-04-27 11:42                               ` Ferruh Yigit
2020-09-25 12:47   ` [dpdk-dev] [PATCH v4 4/6] app/testpmd: fix packet header in txonly mode Wei Hu (Xavier)
2020-09-29 15:40     ` Ferruh Yigit
2020-09-25 12:47   ` [dpdk-dev] [PATCH v4 5/6] app/testpmd: fix valid desc id check Wei Hu (Xavier)
2020-09-25 12:47   ` [dpdk-dev] [PATCH v4 6/6] app/testpmd: fix displaying Rx Tx queues information Wei Hu (Xavier)
2020-09-29 15:40   ` [dpdk-dev] [PATCH v4 0/6] minor fixes for testpmd Ferruh Yigit

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