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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Chengchang Tang <tangchengchang@huawei.com>,
	Matan Azrad <matan@nvidia.com>, "dev@dpdk.org" <dev@dpdk.org>
Cc: "maryam.tahhan@intel.com" <maryam.tahhan@intel.com>,
	"linuxarm@huawei.com" <linuxarm@huawei.com>,
	"wenzhuo.lu@intel.com" <wenzhuo.lu@intel.com>,
	NBU-Contact-Thomas Monjalon <thomas@monjalon.net>,
	"arybchenko@solarflare.com" <arybchenko@solarflare.com>
Subject: Re: [dpdk-dev] [PATCH v3 1/4] ethdev: add a field for rxq info structure
Date: Thu, 3 Sep 2020 15:55:48 +0100
Message-ID: <c02d80eb-9916-3bc9-1b83-82b2b59bba7c@intel.com> (raw)
In-Reply-To: <d8b00373-851a-4650-b5a1-89f4c452be15@huawei.com>

On 9/2/2020 4:52 AM, Chengchang Tang wrote:
> Hi, Matan
> 
> On 2020/9/1 23:33, Matan Azrad wrote:
>>
>> Hi Chengchang
>>
>> Please see some question below.
>>
>> From: Chengchang Tang
>>> Add a field named rx_buf_size in rte_eth_rxq_info to indicate the buffer size
>>> used in receiving packets for HW.
>>>
>>> In this way, upper-layer users can get this information by calling
>>> rte_eth_rx_queue_info_get.
>>>
>>> Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
>>> Reviewed-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
>>> Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>
>>> ---
>>>  lib/librte_ethdev/rte_ethdev.h | 2 ++
>>>  1 file changed, 2 insertions(+)
>>>
>>> diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
>>> index 70295d7..9fed5cb 100644
>>> --- a/lib/librte_ethdev/rte_ethdev.h
>>> +++ b/lib/librte_ethdev/rte_ethdev.h
>>> @@ -1420,6 +1420,8 @@ struct rte_eth_rxq_info {
>>>         struct rte_eth_rxconf conf; /**< queue config parameters. */
>>>         uint8_t scattered_rx;       /**< scattered packets RX supported. */
>>>         uint16_t nb_desc;           /**< configured number of RXDs. */
>>> +       /**< buffer size used for hardware when receive packets. */
>>> +       uint16_t rx_buf_size;
>>
>> Is it the maximum supported Rx buffer by the HW?
>> If yes, maybe max_rx_buf_size is better name?
> 
> No, it is the Rx buffer size currently used by HW.
> 
> IMHO, the structure rte_eth_rxq_info and associated query API are mainly used to query HW configurations
> at runtime or after queue is configured/setup. Therefore, the content of this structure should be the
> current HW configuration.
> 
>> Maybe document that 0 means - no limitation by HW?
> 
> Yes, there is no need to fill this filed for HW that has no restrictions on it.
> I'll add it in v4.

This field in not for max Rx buffer size, so HW restriction doesn't really apply
here.
But as far as I remember it has been decided that the field will be optional for
PMDs, agree to document that part.

> 
>> Must application read it in order to know if its datapath should handle multi-segment buffers?
> 
> I think it's more appropriate to use scattered_rx to determine if multi-segment buffers should be handled.
> 
>>
>> Maybe it will be good to force application to configure scatter when this field is valid and smaller than max_rx_pkt_len\max_lro.. (<= room size)...
>>
>>
>>>  } __rte_cache_min_aligned;
>>>
>>>  /**
> 
> 


  parent reply	other threads:[~2020-09-03 14:55 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-18 12:35 [dpdk-dev] [RFC] ethdev: add a field for rte_eth_rxq_info Chengchang Tang
2020-08-26  1:57 ` [dpdk-dev] [PATCH 0/3] add RX buffer size " Chengchang Tang
2020-08-26  1:57   ` [dpdk-dev] [PATCH 1/3] ethdev: add a field " Chengchang Tang
2020-08-26  1:57   ` [dpdk-dev] [PATCH 2/3] app/testpmd: Add RX buffer size display in queue info querry Chengchang Tang
2020-08-26  1:57   ` [dpdk-dev] [PATCH 3/3] net/hns3: add RX buffer size to rx qinfo querry Chengchang Tang
2020-08-26  7:12 ` [dpdk-dev] [PATCH v2 0/3] add Rx buffer size for rxq info structure Chengchang Tang
2020-08-26  7:12   ` [dpdk-dev] [PATCH v2 1/3] ethdev: add a field " Chengchang Tang
2020-08-26  7:29     ` Wei Hu (Xavier)
2020-08-26  7:12   ` [dpdk-dev] [PATCH v2 2/3] app/testpmd: add Rx buffer size display in queue info query Chengchang Tang
2020-08-26  7:28     ` Wei Hu (Xavier)
2020-08-26 14:42     ` Stephen Hemminger
2020-08-29  6:48       ` Chengchang Tang
2020-08-26  7:12   ` [dpdk-dev] [PATCH v2 3/3] net/hns3: add Rx buffer size to Rx qinfo query Chengchang Tang
2020-08-26  7:20     ` Wei Hu (Xavier)
2020-08-29  7:13 ` [dpdk-dev] [PATCH v3 0/4] add Rx buffer size for rxq info structure Chengchang Tang
2020-08-29  7:13   ` [dpdk-dev] [PATCH v3 1/4] ethdev: add a field " Chengchang Tang
2020-09-01 15:33     ` Matan Azrad
2020-09-02  3:52       ` Chengchang Tang
2020-09-02  7:19         ` Matan Azrad
2020-09-02 10:01           ` Chengchang Tang
2020-09-02 10:30             ` Matan Azrad
2020-09-03  1:48               ` Chengchang Tang
2020-09-06 13:45                 ` Matan Azrad
2020-09-07  7:47                   ` Chengchang Tang
2020-09-07  8:28                     ` Matan Azrad
2020-09-07 12:06                       ` Chengchang Tang
2020-09-07 13:02                         ` Matan Azrad
2020-09-03 15:00           ` Ferruh Yigit
2020-09-03 14:55         ` Ferruh Yigit [this message]
2020-09-03 15:01     ` Ferruh Yigit
2020-09-04  1:43       ` Chengchang Tang
2020-09-03 15:35     ` Bruce Richardson
2020-09-04 14:25       ` Ferruh Yigit
2020-09-04 15:14         ` Bruce Richardson
2020-09-04 15:30         ` Bruce Richardson
2020-08-29  7:13   ` [dpdk-dev] [PATCH v3 2/4] app/testpmd: add Rx buffer size display in queue info query Chengchang Tang
2020-08-29  7:13   ` [dpdk-dev] [PATCH v3 3/4] app/procinfo: add Rx buffer size to --show-port Chengchang Tang
2020-08-29  7:13   ` [dpdk-dev] [PATCH v3 4/4] net/hns3: add Rx buffer size to Rx qinfo query Chengchang Tang
2020-09-05  9:07 ` [dpdk-dev] [PATCH v4 0/5] add Rx buffer size for rxq info structure Chengchang Tang
2020-09-05  9:07   ` [dpdk-dev] [PATCH v4 1/5] ethdev: add a field " Chengchang Tang
2020-09-05 16:50     ` Stephen Hemminger
2020-09-05  9:07   ` [dpdk-dev] [PATCH v4 2/5] app/testpmd: add Rx buffer size display in queue info query Chengchang Tang
2020-09-18  8:54     ` Ferruh Yigit
2020-09-20  8:47       ` Chengchang Tang
2020-09-05  9:07   ` [dpdk-dev] [PATCH v4 3/5] app/procinfo: add Rx buffer size to --show-port Chengchang Tang
2020-09-05 16:59     ` Stephen Hemminger
2020-09-07  9:14       ` Chengchang Tang
2020-09-18 22:11         ` Stephen Hemminger
2020-09-21  2:06           ` Chengchang Tang
2020-09-21 11:26             ` Ferruh Yigit
2020-09-05  9:07   ` [dpdk-dev] [PATCH v4 4/5] net/hns3: add Rx buffer size to Rx qinfo query Chengchang Tang
2020-09-05  9:07   ` [dpdk-dev] [PATCH v4 5/5] doc: remove rxq info structure deprecation notice Chengchang Tang
2020-09-05 16:33     ` Thomas Monjalon
2020-09-07  9:12       ` Chengchang Tang
2020-09-21 13:22 ` [dpdk-dev] [PATCH v5 0/2] add Rx buffer size for rxq info structure Chengchang Tang
2020-09-21 13:22   ` [dpdk-dev] [PATCH v5 1/2] ethdev: add a field " Chengchang Tang
2020-09-21 14:18     ` Ferruh Yigit
2020-09-21 13:22   ` [dpdk-dev] [PATCH v5 2/2] net/hns3: add Rx buffer size to Rx qinfo query Chengchang Tang
2020-09-21 14:19   ` [dpdk-dev] [PATCH v5 0/2] add Rx buffer size for rxq info structure Ferruh Yigit

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