From: "lihuisong (C)" <lihuisong@huawei.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: dev@dpdk.org, thomas@monjalon.net, ferruh.yigit@amd.com,
andrew.rybchenko@oktetlabs.ru, liuyonglong@huawei.com,
"Morten Brørup" <mb@smartsharesystems.com>
Subject: Re: [PATCH v3 0/3] introduce maximum Rx buffer size
Date: Wed, 1 Nov 2023 10:36:07 +0800 [thread overview]
Message-ID: <e09fbef2-dfb4-ce80-aee2-07659de2a0bc@huawei.com> (raw)
In-Reply-To: <20231031084017.64b9f342@fedora>
Hi Stephen,
在 2023/10/31 23:40, Stephen Hemminger 写道:
> On Tue, 31 Oct 2023 10:57:45 +0800
> "lihuisong (C)" <lihuisong@huawei.com> wrote:
>
>>>> User do decide their implement based on their cases in project.
>>>> May it be a point for this that user don't want to do memcpy for
>>>> multi segment packets and just use the first mbuf memory.
>>>>
>>>> Now that there is the "min_rx_bufsize" to report in ethdev layer.
>>>> Anyway, DPDK is indeed the lack of the way to report the maximum Rx
>>>> buffer size per hw descriptor.
>>> My concern is that you are creating a special case for one driver.
>> understand your concern.
>>> And other drivers probably have similar upper bound.
>> Yes, they also have similar upper bound.
>> From the codes, the max buffer size of Most PMDs are 16K and bnxt is
>> 9600Byte.
>> Do we need to report this size? It's a common feature for all PMDs.
> It would make sense then to have max_rx_bufsize set to 16K by default
> in ethdev, and PMD could then raise/lower based on hardware.
It is not appropriate to set to 16K by default in ethdev layer.
Because I don't see any check for the upper bound in some driver, like
axgbe, enetc and so on.
I'm not sure if they have no upper bound.
And some driver's maximum buffer size is "16384(16K) - 128"
So it's better to set to UINT32_MAX by default.
what do you think?
>
> .
next prev parent reply other threads:[~2023-11-01 2:36 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-08 4:02 [RFC] ethdev: " Huisong Li
2023-08-11 12:07 ` Andrew Rybchenko
2023-08-15 8:16 ` lihuisong (C)
2023-08-15 11:10 ` [PATCH v1 0/3] " Huisong Li
2023-08-15 11:10 ` [PATCH v1 1/3] ethdev: " Huisong Li
2023-09-28 15:56 ` Ferruh Yigit
2023-10-24 12:21 ` lihuisong (C)
2023-08-15 11:10 ` [PATCH v1 2/3] app/testpmd: add maximum Rx buffer size display Huisong Li
2023-08-15 11:10 ` [PATCH v1 3/3] net/hns3: report maximum buffer size Huisong Li
2023-10-27 4:15 ` [PATCH v2 0/3] introduce maximum Rx " Huisong Li
2023-10-27 4:15 ` [PATCH v2 1/3] ethdev: " Huisong Li
2023-10-27 6:27 ` fengchengwen
2023-10-27 7:40 ` Morten Brørup
2023-10-28 1:23 ` lihuisong (C)
2023-10-27 4:15 ` [PATCH v2 2/3] app/testpmd: add maximum Rx buffer size display Huisong Li
2023-10-27 6:28 ` fengchengwen
2023-10-27 4:15 ` [PATCH v2 3/3] net/hns3: report maximum buffer size Huisong Li
2023-10-27 6:17 ` fengchengwen
2023-10-28 1:48 ` [PATCH v3 0/3] introduce maximum Rx " Huisong Li
2023-10-28 1:48 ` [PATCH v3 1/3] ethdev: " Huisong Li
2023-10-29 15:43 ` Stephen Hemminger
2023-10-30 3:08 ` lihuisong (C)
2023-10-28 1:48 ` [PATCH v3 2/3] app/testpmd: add maximum Rx buffer size display Huisong Li
2023-10-28 1:48 ` [PATCH v3 3/3] net/hns3: report maximum buffer size Huisong Li
2023-10-29 15:48 ` [PATCH v3 0/3] introduce maximum Rx " Stephen Hemminger
2023-10-30 1:25 ` lihuisong (C)
2023-10-30 18:48 ` Stephen Hemminger
2023-10-31 2:57 ` lihuisong (C)
2023-10-31 7:48 ` Morten Brørup
2023-10-31 15:40 ` Stephen Hemminger
2023-11-01 2:36 ` lihuisong (C) [this message]
2023-11-01 16:08 ` Stephen Hemminger
2023-11-02 1:59 ` lihuisong (C)
2023-11-02 16:23 ` Ferruh Yigit
2023-11-02 16:51 ` Morten Brørup
2023-11-02 17:05 ` Ferruh Yigit
2023-11-02 17:12 ` Morten Brørup
2023-11-02 17:35 ` Ferruh Yigit
2023-11-03 2:13 ` lihuisong (C)
2023-11-02 12:16 ` [PATCH v4 " Huisong Li
2023-11-02 12:16 ` [PATCH v4 1/3] ethdev: " Huisong Li
2023-11-02 16:35 ` Ferruh Yigit
2023-11-03 2:21 ` lihuisong (C)
2023-11-03 3:30 ` Ferruh Yigit
2023-11-03 6:27 ` lihuisong (C)
2023-11-02 12:16 ` [PATCH v4 2/3] app/testpmd: add maximum Rx buffer size display Huisong Li
2023-11-02 16:42 ` Ferruh Yigit
2023-11-03 2:39 ` lihuisong (C)
2023-11-03 3:53 ` Ferruh Yigit
2023-11-03 6:37 ` lihuisong (C)
2023-11-02 12:16 ` [PATCH v4 3/3] net/hns3: report maximum buffer size Huisong Li
2023-11-03 10:27 ` [PATCH v5 0/3] introduce maximum Rx " Huisong Li
2023-11-03 10:27 ` [PATCH v5 1/3] ethdev: " Huisong Li
2023-11-03 12:37 ` Ivan Malov
2023-11-03 10:27 ` [PATCH v5 2/3] app/testpmd: add maximum Rx buffer size display Huisong Li
2023-11-03 10:27 ` [PATCH v5 3/3] net/hns3: report maximum buffer size Huisong Li
2023-11-03 11:53 ` [PATCH v5 0/3] introduce maximum Rx " Ferruh Yigit
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