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From: "Gaëtan Rivet" <gaetan.rivet@6wind.com>
To: Thomas Monjalon <thomas@monjalon.net>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v3 5/9] pmdinfogen: move to drivers subdirectory
Date: Wed, 21 Jun 2017 13:39:29 +0200	[thread overview]
Message-ID: <20170621113929.GE2344@bidouze.vm.6wind.com> (raw)
In-Reply-To: <10937675.k8W90Yh6uJ@xps>

On Wed, Jun 21, 2017 at 12:00:24PM +0200, Thomas Monjalon wrote:
> 21/06/2017 11:40, Gaëtan Rivet:
> > On Wed, Jun 21, 2017 at 09:57:18AM +0200, Thomas Monjalon wrote:
> > > Another (probably better) solution is to keep basic definitions
> > > and helpers in EAL:
> > > 	- rte_pci.h keeps only some PCI definitions and helpers
> > > like rte_pci_addr and eal_parse_pci_BDF() in EAL
> > > 	- bus management is done in the PCI driver
> > > 
> > > For pmdinfogen, we just need struct rte_pci_id.
> > > Other tools or applications will probably need this kind of basic
> > > struct and functions available in EAL.
> > 
> > I mostly agree, this proposal should be kept to a minimum at first for
> > this release and carefully expanded afterward.
> > 
> > If that's ok, I will propose a new version of this patchset with a new
> > librte_pci, that might fix both pmdinfogen and librte_kni.
> 
> Why creating a new librte_pci instead of just keeping it in EAL?

While I agree that it makes sense to have PCI helpers shared among
several subsystems, I do not see a reason for the EAL to rely on it.

The EAL is the bedrock of the whole system. Having those helpers within
would mean that one expects them to be used to build this bedrock. It
would be misleading.

In the context of a framework, aimed at being used by others, an okay
architecture is one that works. A good architecture is one that
intrinsically convey meaning and explains its goal to developers relying
on it. I think that having this PCI lib within EAL just because nothing
prevents us from doing so is mistaken, in this regard.

Conversely, the argument about being conservative in the changes,
especially to an essential part such as the EAL, is obsolete for this
release and this subsystem, as deep changes are necessary anyway,
and the design should be right from the get go to allow further stability.

Finally, the PCI lib and bus is also an example for other developers. I
do not think that all other hardware buses should be allowed in adding
their own specific helpers to the EAL. In this regard, there is no
reason to have an exception made just for the PCI lib.

-- 
Gaëtan Rivet
6WIND

  reply	other threads:[~2017-06-21 11:39 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-01 10:14 [dpdk-dev] [PATCH 0/8] bus/pci: remove PCI bus from EAL Gaetan Rivet
2017-06-01 10:14 ` [dpdk-dev] [PATCH 1/8] eal: expose rte_eal_using_phys_addrs Gaetan Rivet
2017-06-30 19:05   ` Jan Blunck
2017-07-03  8:25     ` Olivier Matz
2017-07-03 10:04       ` Jan Blunck
2017-07-03 11:49         ` Olivier Matz
2017-06-01 10:14 ` [dpdk-dev] [PATCH 2/8] ethdev: remove useless PCI dependency Gaetan Rivet
2017-06-01 10:14 ` [dpdk-dev] [PATCH 3/8] pmdinfogen: move to drivers subdirectory Gaetan Rivet
2017-06-01 10:14 ` [dpdk-dev] [PATCH 4/8] cryptodev: disabled by default Gaetan Rivet
2017-06-01 10:14 ` [dpdk-dev] [PATCH 5/8] eventdev: " Gaetan Rivet
2017-06-01 10:14 ` [dpdk-dev] [PATCH 6/8] pdump: " Gaetan Rivet
2017-06-01 10:14 ` [dpdk-dev] [PATCH 7/8] kni: " Gaetan Rivet
2017-06-01 10:14 ` [dpdk-dev] [PATCH 8/8] bus/pci: introduce pci bus Gaetan Rivet
2017-06-07 23:58 ` [dpdk-dev] [PATCH 0/8] bus/pci: remove PCI bus from EAL Gaetan Rivet
2017-06-07 23:58   ` [dpdk-dev] [PATCH v2 01/12] eal: expose rte_eal_using_phys_addrs Gaetan Rivet
2017-06-07 23:58   ` [dpdk-dev] [PATCH v2 02/12] ethdev: remove useless PCI dependency Gaetan Rivet
2017-06-07 23:58   ` [dpdk-dev] [PATCH v2 03/12] bus: properly include rte_debug Gaetan Rivet
2017-06-07 23:59   ` [dpdk-dev] [PATCH v2 04/12] eal: remove references to PCI Gaetan Rivet
2017-06-07 23:59   ` [dpdk-dev] [PATCH v2 05/12] pmdinfogen: move to drivers subdirectory Gaetan Rivet
2017-06-07 23:59   ` [dpdk-dev] [PATCH v2 06/12] cryptodev: disabled by default Gaetan Rivet
2017-06-09 15:03     ` De Lara Guarch, Pablo
2017-06-14  8:00       ` Gaëtan Rivet
2017-06-07 23:59   ` [dpdk-dev] [PATCH v2 07/12] pdump: " Gaetan Rivet
2017-06-09 14:24     ` Pattan, Reshma
2017-06-11 19:42       ` Gaëtan Rivet
2017-06-13 17:15         ` Ferruh Yigit
2017-06-14 23:01           ` Gaëtan Rivet
2017-06-15 13:07             ` Ferruh Yigit
2017-06-14  9:09         ` Pattan, Reshma
2017-06-14  9:20           ` Gaëtan Rivet
2017-06-07 23:59   ` [dpdk-dev] [PATCH v2 08/12] kni: " Gaetan Rivet
2017-06-09  8:56     ` Ferruh Yigit
2017-06-09  9:06       ` Gaëtan Rivet
2017-06-15 13:09         ` Ferruh Yigit
2017-06-15 14:48           ` Gaëtan Rivet
2017-06-07 23:59   ` [dpdk-dev] [PATCH v2 09/12] bus/pci: introduce pci bus Gaetan Rivet
2017-06-07 23:59   ` [dpdk-dev] [PATCH v2 10/12] bus/pci: follow checkpatch Gaetan Rivet
2017-06-07 23:59   ` [dpdk-dev] [PATCH v2 11/12] drivers: update eventdev dependencies Gaetan Rivet
2017-06-07 23:59   ` [dpdk-dev] [PATCH v2 12/12] drivers: update cryptodev dependencies Gaetan Rivet
2017-06-20 23:36   ` [dpdk-dev] [PATCH v3 0/9] bus/pci: remove PCI bus from EAL Gaetan Rivet
2017-06-20 23:36     ` [dpdk-dev] [PATCH v3 1/9] kni: disabled by default Gaetan Rivet
2017-06-20 23:36     ` [dpdk-dev] [PATCH v3 2/9] eal: expose rte_eal_using_phys_addrs Gaetan Rivet
2017-06-21  7:44       ` Thomas Monjalon
2017-06-21  9:21         ` Gaëtan Rivet
2017-06-20 23:36     ` [dpdk-dev] [PATCH v3 3/9] ethdev: remove useless PCI dependency Gaetan Rivet
2017-06-20 23:36     ` [dpdk-dev] [PATCH v3 4/9] bus: properly include rte_debug Gaetan Rivet
2017-06-21  7:45       ` Thomas Monjalon
2017-06-21  9:26         ` Gaëtan Rivet
2017-06-20 23:36     ` [dpdk-dev] [PATCH v3 5/9] pmdinfogen: move to drivers subdirectory Gaetan Rivet
2017-06-21  7:57       ` Thomas Monjalon
2017-06-21  9:40         ` Gaëtan Rivet
2017-06-21 10:00           ` Thomas Monjalon
2017-06-21 11:39             ` Gaëtan Rivet [this message]
2017-06-21 12:14               ` Thomas Monjalon
2017-06-20 23:36     ` [dpdk-dev] [PATCH v3 6/9] bus/pci: introduce pci bus Gaetan Rivet
2017-06-20 23:36     ` [dpdk-dev] [PATCH v3 7/9] bus/pci: follow checkpatch Gaetan Rivet
2017-06-20 23:36     ` [dpdk-dev] [PATCH v3 8/9] drivers: update eventdev dependencies Gaetan Rivet
2017-06-20 23:36     ` [dpdk-dev] [PATCH v3 9/9] drivers: update cryptodev dependencies Gaetan Rivet
2017-06-23  3:29     ` [dpdk-dev] [PATCH v3 0/9] bus/pci: remove PCI bus from EAL Tan, Jianfeng
2017-06-23  8:19       ` Gaëtan Rivet
2017-06-23 12:48         ` Thomas Monjalon
2017-06-23 14:35           ` Tan, Jianfeng
2017-06-23 14:45             ` Thomas Monjalon

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