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From: Thomas Monjalon <thomas@monjalon.net>
To: Andriy Berestovskyy <Andriy.Berestovskyy@caviumnetworks.com>,
	Bruce Richardson <bruce.richardson@intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v3] ether: use a default for max Rx frame size in configure()
Date: Fri, 21 Apr 2017 00:25:17 +0200	[thread overview]
Message-ID: <2079307.yoZvx5qzNF@xps> (raw)
In-Reply-To: <40c13c68-aadf-1665-a301-7d74be3017cd@caviumnetworks.com>

07/04/2017 17:27, Andriy Berestovskyy:
> Hey Thomas,
> 
> On 07.04.2017 16:47, Thomas Monjalon wrote:
> >> What if we add to the max_rx_pkt_len description: "the effective maximum
> >> RX frame size depends on PMD, please refer the PMD guide for the
> >> details"?
> > 
> > I think the problem is not in the documentation but in the implementations
> > which should be more consistent.
> 
> The hardware is different, there is not much we can do about it.

We can return an error if the max_rx_pkt_len cannot be set in the NIC.

> Nevertheless, we can fix the false comment and have a default for the
> jumbos, which is beneficial for the apps/examples.

The examples are using a hardcoded value, so they need to be fixed anyway.

> > If I understand well, the inconsistency between drivers was already an
> > issue before your patch.
> > Your patch fixes an inconsistency in ethdev without fixing the drivers.
> > We need to know if it is a good first step and if the drivers can be
> > fixed later.
> 
> Thomas, some of the examples use a hard-coded jumbo frame size, which is
> too big for the underlaying PMDs, so those examples fail. The plan was
> to fix them all with this commit in ethdev but I am not sure now you are
> to accept the change.

This ethdev patch is about a behaviour change of the API.
It is about considering 0 as a request for default value
and return an error if a value cannot be set.
It will require more agreements and changes in the drivers
for returning an error where appropriate.

> It is important for us to have those examples working in the upcoming
> release, do you think it is better to send fixes for those examples
> instead of this commit then?

The examples can be improved independently of this patch.

  reply	other threads:[~2017-04-20 22:25 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-23 17:06 [dpdk-dev] [PATCH] ether: fix configure() to use a default for max_rx_pkt_len Andriy Berestovskyy
2017-03-24 11:52 ` [dpdk-dev] [PATCH v2] ether: use a default for max Rx frame size in configure() Andriy Berestovskyy
2017-03-27  6:15   ` Yang, Qiming
2017-03-27  8:38     ` Andriy Berestovskyy
2017-04-07  8:24       ` Bruce Richardson
2017-04-06 20:48   ` Thomas Monjalon
2017-04-07  8:09     ` Andriy Berestovskyy
2017-04-07  8:34       ` Thomas Monjalon
2017-04-07  8:55         ` Andriy Berestovskyy
2017-04-07 11:02 ` [dpdk-dev] [PATCH v3] " Andriy Berestovskyy
2017-04-07 12:15   ` Thomas Monjalon
2017-04-07 12:29     ` Bruce Richardson
2017-04-07 14:18       ` Andriy Berestovskyy
2017-04-07 14:47         ` Thomas Monjalon
2017-04-07 15:27           ` Andriy Berestovskyy
2017-04-20 22:25             ` Thomas Monjalon [this message]
2017-04-24 14:50               ` Andriy Berestovskyy
2017-07-31 22:33                 ` Thomas Monjalon
2018-05-22 22:30                   ` Thomas Monjalon
2018-05-23  5:21                     ` Shahaf Shuler
2018-05-23  5:23                       ` Jerin Jacob
2018-05-24  9:20                       ` Andriy Berestovskyy
2019-01-23 18:36                         ` Ferruh Yigit
2019-01-25 21:15                           ` Andriy Berestovskyy
2017-04-10 14:30 ` [dpdk-dev] [PATCH 1/3] examples/ip_fragmentation: limit max frame size Andriy Berestovskyy
2017-04-10 14:30   ` [dpdk-dev] [PATCH 2/3] examples/ip_reassembly: " Andriy Berestovskyy
2017-04-10 14:30   ` [dpdk-dev] [PATCH 3/3] examples/ipv4_multicast: " Andriy Berestovskyy
2017-04-21  0:21   ` [dpdk-dev] [PATCH 1/3] examples/ip_fragmentation: " Thomas Monjalon
2023-06-08 16:51 ` [PATCH v3] ether: use a default for max Rx frame size in configure() Stephen Hemminger

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