From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: Tetsuya Mukawa <mukawa@igel.co.jp>, "Xie, Huawei" <huawei.xie@intel.com>
Cc: dev@dpdk.org, ann.zhuangyanying@huawei.com
Subject: Re: [dpdk-dev] [PATCH v5 1/3] vhost: Add callback and private data for vhost PMD
Date: Tue, 22 Dec 2015 12:36:45 +0800 [thread overview]
Message-ID: <20151222043645.GI18863@yliu-dev.sh.intel.com> (raw)
In-Reply-To: <56775F82.3090306@igel.co.jp>
On Mon, Dec 21, 2015 at 11:10:10AM +0900, Tetsuya Mukawa wrote:
> nes: 168
>
> On 2015/12/19 3:01, Rich Lane wrote:
> > I'm using the vhost callbacks and struct virtio_net with the vhost PMD in a
> > few ways:
> >
> > 1. new_device/destroy_device: Link state change (will be covered by the
> > link status interrupt).
> > 2. new_device: Add first queue to datapath.
> > 3. vring_state_changed: Add/remove queue to datapath.
> > 4. destroy_device: Remove all queues (vring_state_changed is not called
> > when qemu is killed).
> > 5. new_device and struct virtio_net: Determine NUMA node of the VM.
> >
> > The vring_state_changed callback is necessary because the VM might not be
> > using the maximum number of RX queues. If I boot Linux in the VM it will
> > start out using one RX queue, which can be changed with ethtool. The DPDK
> > app in the host needs to be notified that it can start sending traffic to
> > the new queue.
> >
> > The vring_state_changed callback is also useful for guest TX queues to
> > avoid reading from an inactive queue.
> >
> > API I'd like to have:
> >
> > 1. Link status interrupt.
> > 2. New queue_state_changed callback. Unlike vring_state_changed this should
> > cover the first queue at new_device and removal of all queues at
> > destroy_device.
> > 3. Per-queue or per-device NUMA node info.
>
> Hi Rich and Yuanhan,
>
> As Rich described, some users needs more information when the interrupts
> comes.
> And the virtio_net structure contains the information.
>
> I guess it's very similar to interrupt handling of normal hardware.
> First, a interrupt comes, then an interrupt handler checks status
> register of the device to know actually what was happened.
> In vhost PMD case, reading status register equals reading virtio_net
> structure.
>
> So how about below specification?
>
> 1. The link status interrupt of vhost PMD will occurs when new_device,
> destroy_device and vring_state_changed events are happened.
> 2. Vhost PMD provides a function to let the users know virtio_net
> structure of the interrupted port.
> (Probably almost same as "rte_eth_vhost_portid2vdev" that I described
> in "[PATCH v5 3/3] vhost: Add helper function to convert port id to
> virtio device pointer")
That is one option, to wrapper everything into the link status interrupt
handler, and let it to query the virtio_net structure to know what exactly
happened, and then take the proper action.
With that, we could totally get rid of the "two sets of vhost callbacks".
The interface is a also clean. However, there is a drawback: it's not
that extensible: what if vhost introduces a new vhost callback, and it
does not literally belong to a link status interrupt event?
The another options is to introduce a new set of callbacks (not based on
vhost, but based on vhost-pmd as I suggested before). Here we could
rename the callback to make it looks more reasonable to a pmd driver,
say, remove the new_device()/destroy_device() and combine them as one
callback: link_status_changed.
The good thing about that is it's extensible; we could easily add a
new callback when there is a new one at vhost. However, it's not that
clean as the first one. Besides that, two sets of callback for vhost
is always weird to me.
Thoughts, comments?
--yliu
next prev parent reply other threads:[~2015-12-22 4:35 UTC|newest]
Thread overview: 199+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-31 3:55 [dpdk-dev] [RFC PATCH v2] Add VHOST PMD Tetsuya Mukawa
2015-08-31 3:55 ` [dpdk-dev] [RFC PATCH v2] vhost: " Tetsuya Mukawa
2015-09-23 17:47 ` Loftus, Ciara
2015-10-16 8:40 ` Tetsuya Mukawa
2015-10-20 14:13 ` Loftus, Ciara
2015-10-21 4:30 ` Tetsuya Mukawa
2015-10-21 10:09 ` Bruce Richardson
2015-10-16 12:52 ` Bruce Richardson
2015-10-19 1:51 ` Tetsuya Mukawa
2015-10-19 9:32 ` Loftus, Ciara
2015-10-19 9:45 ` Bruce Richardson
2015-10-19 10:50 ` Tetsuya Mukawa
2015-10-19 13:26 ` Panu Matilainen
2015-10-19 13:27 ` Richardson, Bruce
2015-10-21 4:35 ` Tetsuya Mukawa
2015-10-21 6:25 ` Panu Matilainen
2015-10-21 10:22 ` Bruce Richardson
2015-10-22 9:50 ` Tetsuya Mukawa
2015-10-27 13:44 ` Traynor, Kevin
2015-10-28 2:24 ` Tetsuya Mukawa
2015-10-22 9:45 ` [dpdk-dev] [RFC PATCH v3 0/2] " Tetsuya Mukawa
2015-10-22 9:45 ` [dpdk-dev] [RFC PATCH v3 1/2] vhost: Add callback and private data for vhost PMD Tetsuya Mukawa
2015-10-27 6:12 ` [dpdk-dev] [PATCH 0/3] Add VHOST PMD Tetsuya Mukawa
2015-10-27 6:12 ` [dpdk-dev] [PATCH 1/3] vhost: Fix wrong handling of virtqueue array index Tetsuya Mukawa
2015-10-27 6:29 ` Yuanhan Liu
2015-10-27 6:33 ` Yuanhan Liu
2015-10-27 6:47 ` Yuanhan Liu
2015-10-27 7:28 ` Tetsuya Mukawa
2015-10-27 7:34 ` Yuanhan Liu
2015-10-27 6:12 ` [dpdk-dev] [PATCH 2/3] vhost: Add callback and private data for vhost PMD Tetsuya Mukawa
2015-10-30 17:49 ` Loftus, Ciara
2015-11-02 3:15 ` Tetsuya Mukawa
2015-10-27 6:12 ` [dpdk-dev] [PATCH 3/3] vhost: Add VHOST PMD Tetsuya Mukawa
2015-11-02 3:58 ` [dpdk-dev] [PATCH v2 0/2] " Tetsuya Mukawa
2015-11-02 3:58 ` [dpdk-dev] [PATCH v2 1/2] vhost: Add callback and private data for vhost PMD Tetsuya Mukawa
2015-11-09 5:16 ` [dpdk-dev] [PATCH v3 0/2] Add VHOST PMD Tetsuya Mukawa
2015-11-09 5:17 ` [dpdk-dev] [PATCH v3 1/2] vhost: Add callback and private data for vhost PMD Tetsuya Mukawa
2015-11-09 18:16 ` Aaron Conole
2015-11-10 3:13 ` Tetsuya Mukawa
2015-11-10 7:16 ` Panu Matilainen
2015-11-10 9:48 ` Tetsuya Mukawa
2015-11-10 10:05 ` Panu Matilainen
2015-11-10 10:15 ` Tetsuya Mukawa
2015-11-09 5:17 ` [dpdk-dev] [PATCH v3 2/2] vhost: Add VHOST PMD Tetsuya Mukawa
2015-11-09 6:21 ` Yuanhan Liu
2015-11-09 6:27 ` Tetsuya Mukawa
2015-11-09 22:22 ` Stephen Hemminger
2015-11-10 3:14 ` Tetsuya Mukawa
2015-11-12 12:52 ` Wang, Zhihong
2015-11-13 3:09 ` Tetsuya Mukawa
2015-11-13 3:50 ` Wang, Zhihong
2015-11-13 4:03 ` Rich Lane
2015-11-13 4:29 ` Tetsuya Mukawa
2015-11-13 5:20 ` [dpdk-dev] [PATCH v4 0/2] " Tetsuya Mukawa
2015-11-13 5:20 ` [dpdk-dev] [PATCH v4 1/2] vhost: Add callback and private data for vhost PMD Tetsuya Mukawa
2015-11-17 13:29 ` Yuanhan Liu
2015-11-19 2:03 ` Tetsuya Mukawa
2015-11-19 2:18 ` Yuanhan Liu
2015-11-19 3:13 ` Tetsuya Mukawa
2015-11-19 3:33 ` Yuanhan Liu
2015-11-19 5:14 ` Tetsuya Mukawa
2015-11-19 5:45 ` Yuanhan Liu
2015-11-19 5:58 ` Tetsuya Mukawa
[not found] ` <20151119063137.GJ2326@yliu-dev.sh.intel.com>
2015-11-19 6:37 ` Tetsuya Mukawa
2015-11-13 5:20 ` [dpdk-dev] [PATCH v4 2/2] vhost: Add VHOST PMD Tetsuya Mukawa
2015-11-16 1:57 ` Wang, Zhihong
2015-11-20 11:43 ` Yuanhan Liu
2015-11-24 2:48 ` Tetsuya Mukawa
2015-11-24 3:40 ` Yuanhan Liu
2015-11-24 3:44 ` Tetsuya Mukawa
2015-11-21 0:15 ` Rich Lane
2015-11-24 4:41 ` Tetsuya Mukawa
2015-11-24 9:00 ` [dpdk-dev] [PATCH v5 0/3] " Tetsuya Mukawa
2015-11-24 9:00 ` [dpdk-dev] [PATCH v5 1/3] vhost: Add callback and private data for vhost PMD Tetsuya Mukawa
2015-12-17 11:42 ` Yuanhan Liu
2015-12-18 3:15 ` Tetsuya Mukawa
2015-12-18 3:36 ` Tetsuya Mukawa
2015-12-18 4:15 ` Yuanhan Liu
2015-12-18 4:28 ` Tetsuya Mukawa
2015-12-18 18:01 ` Rich Lane
2015-12-21 2:10 ` Tetsuya Mukawa
2015-12-22 4:36 ` Yuanhan Liu [this message]
2015-12-22 3:41 ` Yuanhan Liu
2015-12-22 4:47 ` Rich Lane
2015-12-22 5:47 ` Yuanhan Liu
2015-12-22 9:38 ` Rich Lane
2015-12-23 2:44 ` Yuanhan Liu
2015-12-23 22:00 ` Thomas Monjalon
2015-12-24 3:51 ` Yuanhan Liu
2015-12-24 4:07 ` Tetsuya Mukawa
2015-12-24 3:09 ` Tetsuya Mukawa
2015-12-24 3:54 ` Tetsuya Mukawa
2015-12-24 4:00 ` Yuanhan Liu
2015-12-24 4:23 ` Tetsuya Mukawa
2015-12-24 5:37 ` Rich Lane
2015-12-24 7:58 ` Tetsuya Mukawa
2015-12-28 21:59 ` Rich Lane
2016-01-06 3:56 ` Tetsuya Mukawa
2016-01-06 7:38 ` Yuanhan Liu
2015-12-18 10:03 ` Xie, Huawei
2015-12-21 2:10 ` Tetsuya Mukawa
2016-02-02 11:18 ` [dpdk-dev] [PATCH v6 0/2] Add VHOST PMD Tetsuya Mukawa
2016-02-02 19:52 ` Rich Lane
2016-02-02 11:18 ` [dpdk-dev] [PATCH v6 1/2] ethdev: Add a new event type to notify a queue state changed event Tetsuya Mukawa
2016-02-02 11:18 ` [dpdk-dev] [PATCH v6 2/2] vhost: Add VHOST PMD Tetsuya Mukawa
2016-02-02 23:43 ` Ferruh Yigit
2016-02-03 2:13 ` Tetsuya Mukawa
2016-02-03 7:48 ` Tetsuya Mukawa
2016-02-03 9:24 ` Ferruh Yigit
2016-02-03 9:35 ` Tetsuya Mukawa
2016-02-04 7:26 ` [dpdk-dev] [PATCH v7 0/2] " Tetsuya Mukawa
2016-02-04 7:26 ` [dpdk-dev] [PATCH v7 1/2] ethdev: Add a new event type to notify a queue state changed event Tetsuya Mukawa
2016-02-04 7:26 ` [dpdk-dev] [PATCH v7 2/2] vhost: Add VHOST PMD Tetsuya Mukawa
2016-02-04 11:17 ` Ferruh Yigit
2016-02-05 6:28 ` Tetsuya Mukawa
2016-02-05 6:35 ` Yuanhan Liu
2016-02-05 7:10 ` Tetsuya Mukawa
2016-02-08 9:42 ` Ferruh Yigit
2016-02-09 1:54 ` Tetsuya Mukawa
2016-02-05 11:28 ` [dpdk-dev] [PATCH v8 0/2] " Tetsuya Mukawa
2016-02-05 11:28 ` [dpdk-dev] [PATCH v8 1/2] ethdev: Add a new event type to notify a queue state changed event Tetsuya Mukawa
2016-02-06 4:57 ` Yuanhan Liu
2016-02-05 11:28 ` [dpdk-dev] [PATCH v8 2/2] vhost: Add VHOST PMD Tetsuya Mukawa
2016-02-06 5:12 ` Yuanhan Liu
2016-02-09 9:38 ` [dpdk-dev] [PATCH v9 0/2] " Tetsuya Mukawa
2016-02-24 2:45 ` Qiu, Michael
2016-02-24 5:09 ` Tetsuya Mukawa
2016-02-25 7:51 ` Qiu, Michael
2016-02-26 4:29 ` Tetsuya Mukawa
2016-02-26 8:35 ` Tetsuya Mukawa
2016-03-01 2:00 ` Qiu, Michael
2016-03-01 2:19 ` Tetsuya Mukawa
2016-03-02 2:24 ` Qiu, Michael
2016-03-04 1:12 ` Tetsuya Mukawa
2016-02-09 9:38 ` [dpdk-dev] [PATCH v9 1/2] ethdev: Add a new event type to notify a queue state changed event Tetsuya Mukawa
2016-03-04 4:17 ` [dpdk-dev] [PATCH v10 0/2] Add VHOST PMD Tetsuya Mukawa
2016-03-04 4:17 ` [dpdk-dev] [PATCH v10 1/2] ethdev: Add a new event type to notify a queue state changed event Tetsuya Mukawa
2016-03-04 4:17 ` [dpdk-dev] [PATCH v10 2/2] vhost: Add VHOST PMD Tetsuya Mukawa
2016-03-04 8:39 ` Yuanhan Liu
2016-03-04 9:58 ` Tetsuya Mukawa
2016-03-07 2:07 ` [dpdk-dev] [PATCH v11 0/2] " Tetsuya Mukawa
2016-03-07 2:07 ` [dpdk-dev] [PATCH v11 1/2] ethdev: Add a new event type to notify a queue state changed event Tetsuya Mukawa
2016-03-07 2:07 ` [dpdk-dev] [PATCH v11 2/2] vhost: Add VHOST PMD Tetsuya Mukawa
2016-03-14 12:02 ` Bruce Richardson
2016-03-15 5:35 ` Tetsuya Mukawa
2016-03-15 8:31 ` [dpdk-dev] [PATCH v12 0/2] " Tetsuya Mukawa
2016-03-15 8:31 ` [dpdk-dev] [PATCH v12 1/2] ethdev: Add a new event type to notify a queue state changed event Tetsuya Mukawa
2016-03-18 13:54 ` Thomas Monjalon
2016-03-15 8:31 ` [dpdk-dev] [PATCH v12 2/2] vhost: Add VHOST PMD Tetsuya Mukawa
2016-03-18 12:27 ` Bruce Richardson
2016-03-18 13:41 ` Tetsuya Mukawa
2016-03-18 13:52 ` Thomas Monjalon
2016-03-18 14:03 ` Tetsuya Mukawa
2016-03-18 14:13 ` Bruce Richardson
2016-03-18 14:21 ` Tetsuya Mukawa
2016-03-21 5:41 ` Tetsuya Mukawa
2016-03-21 5:45 ` [dpdk-dev] [PATCH v13 0/2] " Tetsuya Mukawa
2016-03-21 12:42 ` Bruce Richardson
2016-03-21 5:45 ` [dpdk-dev] [PATCH v13 1/2] ethdev: Add a new event type to notify a queue state changed event Tetsuya Mukawa
2016-03-21 8:37 ` Thomas Monjalon
2016-03-21 9:24 ` Tetsuya Mukawa
2016-03-21 11:05 ` Bruce Richardson
2016-03-21 13:51 ` Tetsuya Mukawa
2016-03-21 5:45 ` [dpdk-dev] [PATCH v13 2/2] vhost: Add VHOST PMD Tetsuya Mukawa
2016-03-21 15:40 ` Loftus, Ciara
2016-03-22 1:55 ` Tetsuya Mukawa
2016-03-22 2:50 ` Tetsuya Mukawa
2016-03-22 10:33 ` Loftus, Ciara
2016-02-09 9:38 ` [dpdk-dev] [PATCH v9 " Tetsuya Mukawa
2015-11-24 9:00 ` [dpdk-dev] [PATCH v5 2/3] " Tetsuya Mukawa
2015-12-18 7:45 ` Yuanhan Liu
2015-12-18 9:25 ` Tetsuya Mukawa
2015-11-24 9:00 ` [dpdk-dev] [PATCH v5 3/3] vhost: Add helper function to convert port id to virtio device pointer Tetsuya Mukawa
2015-12-17 11:47 ` Yuanhan Liu
2015-12-18 3:15 ` Tetsuya Mukawa
2015-12-18 4:19 ` Yuanhan Liu
2015-12-08 1:12 ` [dpdk-dev] [PATCH v5 0/3] Add VHOST PMD Tetsuya Mukawa
2015-12-08 2:03 ` Yuanhan Liu
2015-12-08 2:10 ` Tetsuya Mukawa
2015-11-13 5:32 ` [dpdk-dev] [PATCH v4 0/2] " Yuanhan Liu
2015-11-13 5:37 ` Tetsuya Mukawa
2015-11-13 6:50 ` Tetsuya Mukawa
2015-11-17 13:26 ` Yuanhan Liu
2015-11-19 1:20 ` Tetsuya Mukawa
2015-11-09 5:42 ` [dpdk-dev] [PATCH v3 " Yuanhan Liu
2015-11-02 3:58 ` [dpdk-dev] [PATCH v2 2/2] vhost: " Tetsuya Mukawa
2015-11-06 2:22 ` Yuanhan Liu
2015-11-06 3:54 ` Tetsuya Mukawa
2015-11-05 2:17 ` [dpdk-dev] [PATCH v2 0/2] " Tetsuya Mukawa
2015-11-09 22:25 ` [dpdk-dev] [PATCH 3/3] vhost: " Stephen Hemminger
2015-11-10 3:27 ` Tetsuya Mukawa
2015-10-27 7:54 ` [dpdk-dev] [PATCH 0/3] " Tetsuya Mukawa
2015-10-30 18:30 ` Thomas Monjalon
2015-11-02 3:15 ` Tetsuya Mukawa
2015-10-22 9:45 ` [dpdk-dev] [RFC PATCH v3 2/2] vhost: " Tetsuya Mukawa
2015-10-22 12:49 ` Bruce Richardson
2015-10-23 3:48 ` Tetsuya Mukawa
2015-10-29 14:25 ` Xie, Huawei
2015-10-30 1:18 ` Tetsuya Mukawa
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