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From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
To: Bruce Richardson <bruce.richardson@intel.com>,
	David Marchand <david.marchand@redhat.com>
Cc: Chengwen Feng <fengchengwen@huawei.com>,
	"thomas@monjalon.net" <thomas@monjalon.net>,
	"Yigit, Ferruh" <ferruh.yigit@intel.com>, dev <dev@dpdk.org>,
	"Nipun.gupta@nxp.com" <nipun.gupta@nxp.com>,
	"hemant.agrawal@nxp.com" <hemant.agrawal@nxp.com>,
	Maxime Coquelin <maxime.coquelin@redhat.com>,
	"jerinj@marvell.com" <jerinj@marvell.com>,
	Jerin Jacob <jerinjacobk@gmail.com>, nd <nd@arm.com>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	nd <nd@arm.com>
Subject: Re: [dpdk-dev] [RFC PATCH] dmadev: introduce DMA device library
Date: Wed, 16 Jun 2021 16:48:59 +0000	[thread overview]
Message-ID: <DBAPR08MB58146623DCC760C5938262FF980F9@DBAPR08MB5814.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <YMn4iE2T6C0gSu7b@bricha3-MOBL.ger.corp.intel.com>

<snip>

> 
> On Wed, Jun 16, 2021 at 02:14:54PM +0200, David Marchand wrote:
> > On Tue, Jun 15, 2021 at 3:25 PM Chengwen Feng
> <fengchengwen@huawei.com> wrote:
> > > +
> > > +#define RTE_DMADEV_NAME_MAX_LEN        (64)
> > > +/**< @internal Max length of name of DMA PMD */
> > > +
> > > +/** @internal
> > > + * The data structure associated with each DMA device.
> > > + */
> > > +struct rte_dmadev {
> > > +       /**< Device ID for this instance */
> > > +       uint16_t dev_id;
> > > +       /**< Functions exported by PMD */
> > > +       const struct rte_dmadev_ops *dev_ops;
> > > +       /**< Device info. supplied during device initialization */
> > > +       struct rte_device *device;
> > > +       /**< Driver info. supplied by probing */
> > > +       const char *driver_name;
> > > +
> > > +       /**< Device name */
> > > +       char name[RTE_DMADEV_NAME_MAX_LEN]; } __rte_cache_aligned;
> > > +
> >
> > I see no queue/channel notion.
> > How does a rte_dmadev object relate to a physical hw engine?
> >
> One queue, one device.
> When looking to update the ioat driver for 20.11 release when I added the
> idxd part, I considered adding a queue parameter to the API to look like one
> device with multiple queues. However, since each queue acts completely
> independently of each other, there was no benefit to doing so. It's just easier
> to have a single id to identify a device queue.
Does it mean, the queue is multi thread safe? Do we need queues per core to avoid locking?

  reply	other threads:[~2021-06-16 16:49 UTC|newest]

Thread overview: 79+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-15 13:22 Chengwen Feng
2021-06-15 16:38 ` Bruce Richardson
2021-06-16  7:09   ` Morten Brørup
2021-06-16 10:17     ` fengchengwen
2021-06-16 12:09       ` Morten Brørup
2021-06-16 13:06       ` Bruce Richardson
2021-06-16 14:37       ` Jerin Jacob
2021-06-17  9:15         ` Bruce Richardson
2021-06-18  5:52           ` Jerin Jacob
2021-06-18  9:41             ` fengchengwen
2021-06-22 17:25               ` Jerin Jacob
2021-06-23  3:30                 ` fengchengwen
2021-06-23  7:21                   ` Jerin Jacob
2021-06-23  9:37                     ` Bruce Richardson
2021-06-23 11:40                       ` Jerin Jacob
2021-06-23 14:19                         ` Bruce Richardson
2021-06-24  6:49                           ` Jerin Jacob
2021-06-23  9:41                 ` Bruce Richardson
2021-06-23 10:10                   ` Morten Brørup
2021-06-23 11:46                   ` Jerin Jacob
2021-06-23 14:22                     ` Bruce Richardson
2021-06-18  9:55             ` Bruce Richardson
2021-06-22 17:31               ` Jerin Jacob
2021-06-22 19:17                 ` Bruce Richardson
2021-06-23  7:00                   ` Jerin Jacob
2021-06-16  9:41   ` fengchengwen
2021-06-16 17:31     ` Bruce Richardson
2021-06-16 18:08       ` Jerin Jacob
2021-06-16 19:13         ` Bruce Richardson
2021-06-17  7:42           ` Jerin Jacob
2021-06-17  8:00             ` Bruce Richardson
2021-06-18  5:16               ` Jerin Jacob
2021-06-18 10:03                 ` Bruce Richardson
2021-06-22 17:36                   ` Jerin Jacob
2021-06-17  9:48       ` fengchengwen
2021-06-17 11:02         ` Bruce Richardson
2021-06-17 14:18           ` Bruce Richardson
2021-06-18  8:52             ` fengchengwen
2021-06-18  9:30               ` Bruce Richardson
2021-06-22 17:51               ` Jerin Jacob
2021-06-23  3:50                 ` fengchengwen
2021-06-23 11:00                   ` Jerin Jacob
2021-06-23 14:56                   ` Bruce Richardson
2021-06-24 12:19                     ` fengchengwen
2021-06-26  3:59                       ` [dpdk-dev] dmadev discussion summary fengchengwen
2021-06-28 10:00                         ` Bruce Richardson
2021-06-28 11:14                           ` Ananyev, Konstantin
2021-06-28 12:53                             ` Bruce Richardson
2021-07-02 13:31                           ` fengchengwen
2021-07-01 15:01                         ` Jerin Jacob
2021-07-01 16:33                           ` Bruce Richardson
2021-07-02  7:39                             ` Morten Brørup
2021-07-02 10:05                               ` Bruce Richardson
2021-07-02 13:45                           ` fengchengwen
2021-07-02 14:57                             ` Morten Brørup
2021-07-03  0:32                               ` fengchengwen
2021-07-03  8:53                                 ` Morten Brørup
2021-07-03  9:08                                   ` Jerin Jacob
2021-07-03 12:24                                     ` Morten Brørup
2021-07-04  7:43                                       ` Jerin Jacob
2021-07-05 10:28                                         ` Morten Brørup
2021-07-06  7:11                                           ` fengchengwen
2021-07-03  9:45                                   ` fengchengwen
2021-07-03 12:00                                     ` Morten Brørup
2021-07-04  7:34                                       ` Jerin Jacob
2021-07-02  7:07                         ` Liang Ma
2021-07-02 13:59                           ` fengchengwen
2021-06-24  7:03                   ` [dpdk-dev] [RFC PATCH] dmadev: introduce DMA device library Jerin Jacob
2021-06-24  7:59                     ` Morten Brørup
2021-06-24  8:05                       ` Jerin Jacob
2021-06-23  5:34       ` Hu, Jiayu
2021-06-23 11:07         ` Jerin Jacob
2021-06-16  2:17 ` Wang, Haiyue
2021-06-16  8:04   ` Bruce Richardson
2021-06-16  8:16     ` Wang, Haiyue
2021-06-16 12:14 ` David Marchand
2021-06-16 13:11   ` Bruce Richardson
2021-06-16 16:48     ` Honnappa Nagarahalli [this message]
2021-06-16 19:10       ` Bruce Richardson

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