From: Jason Wang <jasowang@redhat.com>
To: Wu Zongyong <wuzongyong@linux.alibaba.com>
Cc: wei.yang1@linux.alibaba.com, mst@redhat.com,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH v6 6/8] virtio_vdpa: setup correct vq size with callbacks get_vq_num_{max,min}
Date: Mon, 25 Oct 2021 12:45:44 +0800 [thread overview]
Message-ID: <bfb2875b-0da1-27e8-829b-f6b61ea6e326@redhat.com> (raw)
In-Reply-To: <20211025024403.GA3684@L-PF27918B-1352.localdomain>
在 2021/10/25 上午10:44, Wu Zongyong 写道:
> On Mon, Oct 25, 2021 at 10:22:30AM +0800, Jason Wang wrote:
>> On Fri, Oct 22, 2021 at 10:45 AM Wu Zongyong
>> <wuzongyong@linux.alibaba.com> wrote:
>>> For the devices which implement the get_vq_num_min callback, the driver
>>> should not negotiate with virtqueue size with the backend vdpa device if
>>> the value returned by get_vq_num_min equals to the value returned by
>>> get_vq_num_max.
>>> This is useful for vdpa devices based on legacy virtio specfication.
>>>
>>> Signed-off-by: Wu Zongyong <wuzongyong@linux.alibaba.com>
>>> ---
>>> drivers/virtio/virtio_vdpa.c | 21 ++++++++++++++++-----
>>> 1 file changed, 16 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
>>> index 72eaef2caeb1..e42ace29daa1 100644
>>> --- a/drivers/virtio/virtio_vdpa.c
>>> +++ b/drivers/virtio/virtio_vdpa.c
>>> @@ -145,7 +145,8 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
>>> /* Assume split virtqueue, switch to packed if necessary */
>>> struct vdpa_vq_state state = {0};
>>> unsigned long flags;
>>> - u32 align, num;
>>> + u32 align, max_num, min_num = 0;
>>> + bool may_reduce_num = true;
>>> int err;
>>>
>>> if (!name)
>>> @@ -163,22 +164,32 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
>>> if (!info)
>>> return ERR_PTR(-ENOMEM);
>>>
>>> - num = ops->get_vq_num_max(vdpa);
>>> - if (num == 0) {
>>> + max_num = ops->get_vq_num_max(vdpa);
>>> + if (max_num == 0) {
>>> err = -ENOENT;
>>> goto error_new_virtqueue;
>>> }
>>>
>>> + if (ops->get_vq_num_min)
>>> + min_num = ops->get_vq_num_min(vdpa);
>>> +
>>> + may_reduce_num = (max_num == min_num) ? false : true;
>>> +
>>> /* Create the vring */
>>> align = ops->get_vq_align(vdpa);
>>> - vq = vring_create_virtqueue(index, num, align, vdev,
>>> - true, true, ctx,
>>> + vq = vring_create_virtqueue(index, max_num, align, vdev,
>>> + true, may_reduce_num, ctx,
>>> virtio_vdpa_notify, callback, name);
>>> if (!vq) {
>>> err = -ENOMEM;
>>> goto error_new_virtqueue;
>>> }
>>>
>>> + if (virtqueue_get_vring_size(vq) < min_num) {
>>> + err = -EINVAL;
>>> + goto err_vq;
>>> + }
>> I wonder under which case can we hit this?
>>
>> Thanks
> If min_vq_num < max_vq_num, may_reduce_num should be true, then it is
> possible to allocate a virtqueue with a small size which value is less
> than the min_vq_num since we only set the upper bound for virtqueue size
> when creating virtqueue.
>
> Refers to vring_create_virtqueue_split in driver/virtio/virtio_vring.c:
>
> for (; num && vring_size(num, vring_align) > PAGE_SIZE; num /= 2) {
> queue = vring_alloc_queue(vdev, vring_size(num, vring_align),
> &dma_addr,
> GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO);
> if (queue)
> break;
> if (!may_reduce_num)
> return NULL;
> }
It looks to me it's better to fix this function instead of checking it
in the caller?
>
> BTW, I have replied this mail on Nov.18, have you ever received it?
For some reason I dont' get that.
Thanks
>>> +
>>> /* Setup virtqueue callback */
>>> cb.callback = virtio_vdpa_virtqueue_cb;
>>> cb.private = info;
>>> --
>>> 2.31.1
>>>
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next prev parent reply other threads:[~2021-10-25 4:45 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1631101392.git.wuzongyong@linux.alibaba.com>
[not found] ` <88701e88ab061f5d1b94bd046afcb9d3588414c3.1631101392.git.wuzongyong@linux.alibaba.com>
2021-09-09 2:53 ` [PATCH 3/6] vp_vdpa: add vq irq offloading support Jason Wang
[not found] ` <ebd83066e3897aae63e4b02f8729a73dd09931c6.1631101392.git.wuzongyong@linux.alibaba.com>
2021-09-09 2:55 ` [PATCH 5/6] vdpa: add get_vq_num_unchangeable callback in vdpa_config_ops Jason Wang
2021-09-09 9:18 ` Michael S. Tsirkin
2021-09-09 9:32 ` Jason Wang
[not found] ` <20210909080157.GA17383@L-PF27918B-1352.localdomain>
2021-09-09 9:28 ` Jason Wang
[not found] ` <20210909095726.GA17469@L-PF27918B-1352.localdomain>
2021-09-10 1:45 ` Jason Wang
[not found] ` <20210910073231.GA17715@L-PF27918B-1352.localdomain>
[not found] ` <CACLfguWeXwWJ9yd18vHbYicOk5=eMZJ0X=m86EKjmgHu35NdVA@mail.gmail.com>
[not found] ` <20210910092013.GA17783@L-PF27918B-1352.localdomain>
[not found] ` <CACLfguXFDra77Nqiv+ArUEOzTf9rzi0gLK4_r0ofCfJHSO056Q@mail.gmail.com>
2021-09-13 1:43 ` Jason Wang
[not found] ` <20210913025920.GB17820@L-PF27918B-1352.localdomain>
2021-09-13 3:13 ` Jason Wang
2021-09-09 3:05 ` [PATCH 0/6] vDPA driver for legacy virtio-pci device Jason Wang
2021-09-09 3:20 ` Jason Wang
2021-09-09 9:21 ` Michael S. Tsirkin
2021-09-09 9:31 ` Jason Wang
[not found] ` <20210909081211.GB17383@L-PF27918B-1352.localdomain>
2021-09-09 9:29 ` Jason Wang
[not found] ` <20210909125338.GA17535@L-PF27918B-1352.localdomain>
2021-09-10 1:44 ` Jason Wang
[not found] ` <8b084e5beb1111ad98bb64177ebd0e9845c178fa.1631101392.git.wuzongyong@linux.alibaba.com>
2021-09-09 13:57 ` [PATCH 6/6] vp_vdpa: introduce legacy virtio pci driver Michael S. Tsirkin
[not found] ` <20210910022818.GB17535@L-PF27918B-1352.localdomain>
2021-09-10 9:57 ` Michael S. Tsirkin
2021-10-22 9:37 ` Michael S. Tsirkin
[not found] ` <cover.1631621507.git.wuzongyong@linux.alibaba.com>
[not found] ` <834528d24c839080215b2e077f100e9ed5073edc.1631621507.git.wuzongyong@linux.alibaba.com>
2021-09-14 12:58 ` [PATCH v2 4/5] vdpa: add new vdpa attribute VDPA_ATTR_DEV_F_VERSION_1 Michael S. Tsirkin
2021-09-15 3:18 ` Jason Wang
2021-09-15 7:38 ` Michael S. Tsirkin
2021-09-15 8:06 ` Jason Wang
2021-09-15 11:08 ` Michael S. Tsirkin
2021-09-16 1:05 ` Jason Wang
[not found] ` <20210917023451.GA19669@L-PF27918B-1352.localdomain>
2021-09-17 7:51 ` Jason Wang
[not found] ` <20210915121234.GA19232@L-PF27918B-1352.localdomain>
2021-09-16 1:11 ` Jason Wang
[not found] ` <20210915032453.GA18793@L-PF27918B-1352.localdomain>
2021-09-15 7:30 ` Michael S. Tsirkin
2021-09-15 8:05 ` Jason Wang
2021-09-15 11:10 ` Michael S. Tsirkin
[not found] ` <f833e77685cd1dfadc5c3b6688d29a0d1383dbb9.1631621507.git.wuzongyong@linux.alibaba.com>
2021-09-14 22:37 ` [PATCH v2 1/5] virtio-pci: introduce legacy device module Randy Dunlap
[not found] ` <42c5a09aacae346449bcc7b7b54d63f9d265e622.1631621507.git.wuzongyong@linux.alibaba.com>
2021-09-15 3:15 ` [PATCH v2 2/5] vdpa: fix typo Jason Wang
[not found] ` <11a491e2200e17319989ff9043b8d58867610197.1631621507.git.wuzongyong@linux.alibaba.com>
2021-09-15 3:16 ` [PATCH v2 3/5] vp_vdpa: add vq irq offloading support Jason Wang
[not found] ` <20210915033102.GB18793@L-PF27918B-1352.localdomain>
2021-09-15 4:13 ` Jason Wang
[not found] ` <ab98427764198053b4277a127eaea3f32cd40ed5.1631621507.git.wuzongyong@linux.alibaba.com>
2021-09-14 22:35 ` [PATCH v2 5/5] eni_vdpa: add vDPA driver for Alibaba ENI Randy Dunlap
2021-09-15 3:14 ` Jason Wang
2021-09-15 13:36 ` kernel test robot
[not found] ` <cover.1632313398.git.wuzongyong@linux.alibaba.com>
[not found] ` <296014fa3b765f2088a3183bf04e09863651a584.1632313398.git.wuzongyong@linux.alibaba.com>
2021-09-26 2:24 ` [PATCH v3 7/7] " Jason Wang
[not found] ` <20210926032434.GA32570@L-PF27918B-1352.localdomain>
2021-09-26 4:18 ` Jason Wang
2021-09-27 10:36 ` Michael S. Tsirkin
2021-09-28 2:17 ` Jason Wang
2021-09-26 2:26 ` Jason Wang
[not found] ` <20210926032701.GA32606@L-PF27918B-1352.localdomain>
2021-09-26 4:19 ` Jason Wang
2021-09-29 12:54 ` kernel test robot
[not found] ` <cover.1632882380.git.wuzongyong@linux.alibaba.com>
[not found] ` <a068c730a0707d35afbbf72a5e0eb29f427f6045.1632882380.git.wuzongyong@linux.alibaba.com>
2021-10-11 3:00 ` [PATCH v4 1/7] virtio-pci: introduce legacy device module Jason Wang
2021-10-11 3:02 ` Jason Wang
[not found] ` <49dc74038cdfaa7af7dab1565ba5da5d6cc4ec7d.1632882380.git.wuzongyong@linux.alibaba.com>
2021-10-11 3:03 ` [PATCH v4 2/7] vdpa: fix typo Jason Wang
[not found] ` <451ce3c272ebd5d532db1ed19c2ab53c4609f7ad.1632882380.git.wuzongyong@linux.alibaba.com>
2021-10-11 3:04 ` [PATCH v4 4/7] vdpa: add new callback get_vq_num_min in vdpa_config_ops Jason Wang
[not found] ` <e971b011b9224a4da4fcab6e904fcee0b7393ac6.1632882380.git.wuzongyong@linux.alibaba.com>
2021-10-11 3:06 ` [PATCH v4 5/7] virtio_vdpa: setup correct vq size with callbacks get_vq_num_{max,min} Jason Wang
[not found] ` <ab430c611c3d8074fddc6c4e0f747852678d6b3f.1632882380.git.wuzongyong@linux.alibaba.com>
2021-10-11 3:10 ` [PATCH v4 6/7] vdpa: add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE Jason Wang
[not found] ` <68d4ffac2ed9c21f352c272efbdf21e567d7d48e.1632882380.git.wuzongyong@linux.alibaba.com>
2021-10-11 3:18 ` [PATCH v4 7/7] eni_vdpa: add vDPA driver for Alibaba ENI Jason Wang
[not found] ` <cover.1634281805.git.wuzongyong@linux.alibaba.com>
[not found] ` <57a04a9e516ec4055cb887e9c7b24658ca5b0228.1634281805.git.wuzongyong@linux.alibaba.com>
2021-10-15 8:18 ` [PATCH v5 8/8] " Jason Wang
2021-10-15 19:13 ` Randy Dunlap
[not found] ` <17a38d70dd6f598f98eca68731746b6945a36d36.1634281805.git.wuzongyong@linux.alibaba.com>
2021-10-15 8:22 ` [PATCH v5 1/8] virtio-pci: introduce legacy device module Jason Wang
[not found] ` <25435d5cde12f298133196e866662b0ef2225205.1634281805.git.wuzongyong@linux.alibaba.com>
2021-10-15 8:22 ` [PATCH v5 4/8] vdpa: add new callback get_vq_num_min in vdpa_config_ops Jason Wang
[not found] ` <5b75093fc4a866a4502485ec208ca0e55440bdf7.1634281805.git.wuzongyong@linux.alibaba.com>
2021-10-15 8:24 ` [PATCH v5 5/8] vdpa: min vq num of vdpa device cannot be greater than max vq num Jason Wang
[not found] ` <4fae24ebd63ac4ec513bfe0688051469ea0588c0.1634281805.git.wuzongyong@linux.alibaba.com>
2021-10-15 8:30 ` [PATCH v5 6/8] virtio_vdpa: setup correct vq size with callbacks get_vq_num_{max,min} Jason Wang
[not found] ` <cover.1634870456.git.wuzongyong@linux.alibaba.com>
[not found] ` <7bb4834a0638fabaf3ba1a585b607830392a088f.1634870456.git.wuzongyong@linux.alibaba.com>
2021-10-25 1:30 ` [PATCH v6 1/8] virtio-pci: introduce legacy device module Jason Wang
[not found] ` <7e4d859949fa37fce2289a4b287843cdeffcaf8a.1634870456.git.wuzongyong@linux.alibaba.com>
2021-10-25 2:17 ` [PATCH v6 4/8] vdpa: add new callback get_vq_num_min in vdpa_config_ops Jason Wang
[not found] ` <41e5d4e7d9e6f46429ce45a80f81f40fdb8e11cb.1634870456.git.wuzongyong@linux.alibaba.com>
2021-10-25 2:18 ` [PATCH v6 5/8] vdpa: min vq num of vdpa device cannot be greater than max vq num Jason Wang
[not found] ` <c75b4499f7ead922daa19bf67b32eed6f185d260.1634870456.git.wuzongyong@linux.alibaba.com>
2021-10-25 2:22 ` [PATCH v6 6/8] virtio_vdpa: setup correct vq size with callbacks get_vq_num_{max, min} Jason Wang
[not found] ` <20211025024403.GA3684@L-PF27918B-1352.localdomain>
2021-10-25 4:45 ` Jason Wang [this message]
[not found] ` <20211025062454.GA4832@L-PF27918B-1352.localdomain>
2021-10-26 4:46 ` Jason Wang
[not found] ` <f3d36f0d7c9588aefaf6eeaa235b0a22fee23d56.1634870456.git.wuzongyong@linux.alibaba.com>
2021-10-25 2:23 ` [PATCH v6 7/8] vdpa: add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE Jason Wang
[not found] ` <6496b76a64303a3e23ea19e3e279644608de36fb.1634870456.git.wuzongyong@linux.alibaba.com>
2021-10-25 2:27 ` [PATCH v6 8/8] eni_vdpa: add vDPA driver for Alibaba ENI Jason Wang
[not found] ` <20211025032146.GC3684@L-PF27918B-1352.localdomain>
2021-10-25 4:40 ` Jason Wang
[not found] ` <20211027024700.GA23409@L-PF27918B-1352.localdomain>
2021-10-27 3:55 ` Jason Wang
[not found] ` <cover.1635493219.git.wuzongyong@linux.alibaba.com>
2021-11-01 3:31 ` [PATCH v7 0/9] " Jason Wang
[not found] ` <20211101062250.GA29814@L-PF27918B-1352.localdomain>
2021-11-01 7:02 ` Jason Wang
[not found] ` <20211101081159.GA4341@L-PF27918B-1352.localdomain>
2021-11-01 11:12 ` Michael S. Tsirkin
[not found] ` <0945b37f19b96ecadb79a4e1b01f486119a0b83a.1635493219.git.wuzongyong@linux.alibaba.com>
2021-11-01 8:18 ` [PATCH v7 9/9] eni_vdpa: alibaba: fix Kconfig typo Michael S. Tsirkin
2021-11-01 8:19 ` [PATCH v7 0/9] vDPA driver for Alibaba ENI Michael S. Tsirkin
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