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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Jason Wang <jasowang@redhat.com>, Tiwei Bie <tiwei.bie@intel.com>
Cc: zhihong.wang@intel.com, amorenoz@redhat.com,
	xiao.w.wang@intel.com, dev@dpdk.org, jfreimann@redhat.com,
	stable@dpdk.org
Subject: Re: [dpdk-stable] [PATCH 10/15] net/virtio: add vDPA op to configure and start the device
Date: Wed, 4 Sep 2019 08:56:32 +0200
Message-ID: <4d9888a3-ec38-ceb2-93f8-e85c68017422@redhat.com> (raw)
In-Reply-To: <718b4bc8-1a04-689f-5a3a-b6d80c517720@redhat.com>



On 9/4/19 6:06 AM, Jason Wang wrote:
> 
> On 2019/9/3 下午4:49, Tiwei Bie wrote:
>> On Tue, Sep 03, 2019 at 09:40:25AM +0200, Maxime Coquelin wrote:
>>> On 9/3/19 7:30 AM, Tiwei Bie wrote:
>>>> On Thu, Aug 29, 2019 at 09:59:55AM +0200, Maxime Coquelin wrote:
>>>>> In order to support multi-queue, we need to implement the control
>>>>> path. The problem is that both the Vhost-user master and slave use
>>>>> VAs in their processes address spaces as IOVAs, which creates
>>>>> collusions between the data rings IOVAs managed the master, and
>>>>> the Control ring IOVAs. The trick here is to remmap the Control
>>>>> ring memory to another range, after the slave is aware of master's
>>>>> ranges.
>>>>>
>>>>> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>>>>> ---
>>>>>   drivers/net/virtio/virtio_vdpa.c | 255
>>>>> +++++++++++++++++++++++++++++++
>>>>>   1 file changed, 255 insertions(+)
>>>>>
>>>>> diff --git a/drivers/net/virtio/virtio_vdpa.c
>>>>> b/drivers/net/virtio/virtio_vdpa.c
>>>>> index fc52a8e92..13b4dd07d 100644
>>>>> --- a/drivers/net/virtio/virtio_vdpa.c
>>>>> +++ b/drivers/net/virtio/virtio_vdpa.c
>>>>> @@ -106,6 +106,127 @@ find_internal_resource_by_dev(struct
>>>>> rte_pci_device *pdev)
>>>>>       return list;
>>>>>   }
>>>>>   +static int
>>>>> +virtio_vdpa_dma_map_ctrl_queue(struct virtio_vdpa_device *dev, int
>>>>> do_map,
>>>>> +        uint64_t iova)
>>>>> +{
>>>>> +    const struct rte_memzone *mz;
>>>>> +    int ret;
>>>>> +
>>>>> +    /*
>>>>> +     * IOVAs are processes VAs. We cannot use them as the Data and
>>>>> Control
>>>>> +     * paths are run in different processes, which may (does) lead to
>>>>> +     * collusions. The trick here is to fixup Ctrl path IOVAs so
>>>>> that they
>>>>> +     * start after the Data path ranges.
>>>>> +     */
>>>>> +    if (do_map) {
>>>>> +        mz = dev->cvq->cq.mz;
>>>>> +        ret = rte_vfio_container_dma_map(dev->vfio_container_fd,
>>>>> +                (uint64_t)(uintptr_t)mz->addr,
>>>>> +                iova, mz->len);
>>>>> +        if (ret < 0) {
>>>>> +            DRV_LOG(ERR, "Failed to map ctrl ring (%d)", ret);
>>>>> +            return ret;
>>>>> +        }
>>>>> +
>>>>> +        dev->cvq->vq_ring_mem = iova;
>>>>> +        iova += mz->len;
>>>>> +
>>>>> +        mz = dev->cvq->cq.virtio_net_hdr_mz;
>>>>> +        ret = rte_vfio_container_dma_map(dev->vfio_container_fd,
>>>>> +                (uint64_t)(uintptr_t)mz->addr,
>>>>> +                iova, mz->len);
>>>>> +        if (ret < 0) {
>>>>> +            DRV_LOG(ERR, "Failed to map ctrl headers (%d)", ret);
>>>>> +            return ret;
>>>>> +        }
>>>> This will allow guest to access the cq.mz and cq.virtio_net_hdr_mz
>>>> via the device which may have potential risks.
>>> I get what you mean, but I'm not sure to see how we could avoid that.
>>> AFAIU, we need to map the control queue in the device IOMMU, otherwise
>>> how could the host (in case of virtual device) or the NIC (in case of
>>> Virtio offload), could access the ring?
>>> Any thoughts?
>> I also don't see a way to avoid that. That's why I said in below
>> thread that I think the control queue based interface seems not a
>> quite good interface for a backend device:
>>
>> https://lkml.org/lkml/2019/9/2/934
>>
>> In IFCVF NIC, we added a MMIO based interface to replace control
>> queue for the multiqueue setup in vDPA mode.
>>
>> Jason is proposing some changes to make virtio device suitable
>> for backend device. I'm not sure whether it's possible to cover
>> this case as well..
> 
> 
> A silly question, can we do dynamic mapping like what kernel driver did
> here?

Not silly at all, it is of course possible.
I will implement that in my v2.

Thanks!
Maxime

> Thanks
> 
> 
>>
>> Regards,
>> Tiwei
>>
>>> Thanks,
>>> Maxime
>>>> Regards,
>>>> Tiwei
>>>>
>>>>> +
>>>>> +        dev->cvq->cq.virtio_net_hdr_mem = iova;
>>>>> +    } else {
>>>>> +        mz = dev->cvq->cq.mz;
>>>>> +        ret = rte_vfio_container_dma_unmap(dev->vfio_container_fd,
>>>>> +                (uint64_t)(uintptr_t)mz->addr,
>>>>> +                iova, mz->len);
>>>>> +        if (ret < 0) {
>>>>> +            DRV_LOG(ERR, "Failed to unmap ctrl ring (%d)", ret);
>>>>> +            return ret;
>>>>> +        }
>>>>> +
>>>>> +        dev->cvq->vq_ring_mem = 0;
>>>>> +        iova += mz->len;
>>>>> +
>>>>> +        mz = dev->cvq->cq.virtio_net_hdr_mz;
>>>>> +        ret = rte_vfio_container_dma_unmap(dev->vfio_container_fd,
>>>>> +                (uint64_t)(uintptr_t)mz->addr,
>>>>> +                iova, mz->len);
>>>>> +        if (ret < 0) {
>>>>> +            DRV_LOG(ERR, "Failed to unmap ctrl headers (%d)", ret);
>>>>> +            return ret;
>>>>> +        }
>>>>> +
>>>>> +        dev->cvq->cq.virtio_net_hdr_mem = 0;
>>>>> +    }
>>>>> +
>>>>> +    return 0;
>>>>> +}
>>>>> +
>>>>> +static int
>>>>> +virtio_vdpa_dma_map(struct virtio_vdpa_device *dev, int do_map)
>>>>> +{
>>>>> +    uint32_t i;
>>>>> +    int ret;
>>>>> +    struct rte_vhost_memory *mem = NULL;
>>>>> +    int vfio_container_fd;
>>>>> +    uint64_t avail_iova = 0;
>>>>> +
>>>>> +    ret = rte_vhost_get_mem_table(dev->vid, &mem);
>>>>> +    if (ret < 0 || !mem) {
>>>>> +        DRV_LOG(ERR, "failed to get VM memory layout.");
>>>>> +        return ret;
>>>>> +    }
>>>>> +
>>>>> +    vfio_container_fd = dev->vfio_container_fd;
>>>>> +
>>>>> +    for (i = 0; i < mem->nregions; i++) {
>>>>> +        struct rte_vhost_mem_region *reg;
>>>>> +
>>>>> +        reg = &mem->regions[i];
>>>>> +        DRV_LOG(INFO, "%s, region %u: HVA 0x%" PRIx64 ", "
>>>>> +            "GPA 0x%" PRIx64 ", size 0x%" PRIx64 ".",
>>>>> +            do_map ? "DMA map" : "DMA unmap", i,
>>>>> +            reg->host_user_addr, reg->guest_phys_addr, reg->size);
>>>>> +
>>>>> +        if (reg->guest_phys_addr + reg->size > avail_iova)
>>>>> +            avail_iova = reg->guest_phys_addr + reg->size;
>>>>> +
>>>>> +        if (do_map) {
>>>>> +            ret = rte_vfio_container_dma_map(vfio_container_fd,
>>>>> +                reg->host_user_addr, reg->guest_phys_addr,
>>>>> +                reg->size);
>>>>> +            if (ret < 0) {
>>>>> +                DRV_LOG(ERR, "DMA map failed.");
>>>>> +                goto exit;
>>>>> +            }
>>>>> +        } else {
>>>>> +            ret = rte_vfio_container_dma_unmap(vfio_container_fd,
>>>>> +                reg->host_user_addr, reg->guest_phys_addr,
>>>>> +                reg->size);
>>>>> +            if (ret < 0) {
>>>>> +                DRV_LOG(ERR, "DMA unmap failed.");
>>>>> +                goto exit;
>>>>> +            }
>>>>> +        }
>>>>> +    }
>>>>> +
>>>>> +    if (dev->cvq)
>>>>> +        ret = virtio_vdpa_dma_map_ctrl_queue(dev, do_map,
>>>>> avail_iova);
>>>>> +
>>>>> +exit:
>>>>> +    free(mem);
>>>>> +
>>>>> +    return ret;
>>>>> +}
>>>>> +
>>>>>   static int
>>>>>   virtio_vdpa_vfio_setup(struct virtio_vdpa_device *dev)
>>>>>   {
>>>>> @@ -216,10 +337,144 @@ virtio_vdpa_get_protocol_features(int did
>>>>> __rte_unused, uint64_t *features)
>>>>>       return 0;
>>>>>   }
>>>>>   +static uint64_t
>>>>> +hva_to_gpa(int vid, uint64_t hva)
>>>>> +{
>>>>> +    struct rte_vhost_memory *mem = NULL;
>>>>> +    struct rte_vhost_mem_region *reg;
>>>>> +    uint32_t i;
>>>>> +    uint64_t gpa = 0;
>>>>> +
>>>>> +    if (rte_vhost_get_mem_table(vid, &mem) < 0)
>>>>> +        goto exit;
>>>>> +
>>>>> +    for (i = 0; i < mem->nregions; i++) {
>>>>> +        reg = &mem->regions[i];
>>>>> +
>>>>> +        if (hva >= reg->host_user_addr &&
>>>>> +                hva < reg->host_user_addr + reg->size) {
>>>>> +            gpa = hva - reg->host_user_addr + reg->guest_phys_addr;
>>>>> +            break;
>>>>> +        }
>>>>> +    }
>>>>> +
>>>>> +exit:
>>>>> +    if (mem)
>>>>> +        free(mem);
>>>>> +    return gpa;
>>>>> +}
>>>>> +
>>>>> +static int
>>>>> +virtio_vdpa_start(struct virtio_vdpa_device *dev)
>>>>> +{
>>>>> +    struct virtio_hw *hw = &dev->hw;
>>>>> +    int i, vid, nr_vring, ret;
>>>>> +    struct rte_vhost_vring vr;
>>>>> +    struct virtio_pmd_ctrl ctrl;
>>>>> +    int dlen[1];
>>>>> +
>>>>> +    vid = dev->vid;
>>>>> +    nr_vring = rte_vhost_get_vring_num(vid);
>>>>> +
>>>>> +    if (dev->vqs)
>>>>> +        rte_free(dev->vqs);
>>>>> +
>>>>> +    dev->vqs = rte_zmalloc("virtio_vdpa", sizeof(*dev->vqs) *
>>>>> nr_vring, 0);
>>>>> +
>>>>> +    for (i = 0; i < nr_vring; i++) {
>>>>> +        struct virtqueue *vq = &dev->vqs[i];
>>>>> +
>>>>> +        rte_vhost_get_vhost_vring(vid, i, &vr);
>>>>> +
>>>>> +        vq->vq_queue_index = i;
>>>>> +        vq->vq_nentries = vr.size;
>>>>> +        vq->vq_ring_mem = hva_to_gpa(vid,
>>>>> (uint64_t)(uintptr_t)vr.desc);
>>>>> +        if (vq->vq_ring_mem  == 0) {
>>>>> +            DRV_LOG(ERR, "Fail to get GPA for descriptor ring.");
>>>>> +            ret = -1;
>>>>> +            goto out_free_vqs;
>>>>> +        }
>>>>> +
>>>>> +        ret = VTPCI_OPS(hw)->setup_queue(hw, vq);
>>>>> +        if (ret) {
>>>>> +            DRV_LOG(ERR, "Fail to setup queue.");
>>>>> +            goto out_free_vqs;
>>>>> +        }
>>>>> +    }
>>>>> +
>>>>> +    if (dev->cvq) {
>>>>> +        ret = VTPCI_OPS(hw)->setup_queue(hw, dev->cvq);
>>>>> +        if (ret) {
>>>>> +            DRV_LOG(ERR, "Fail to setup ctrl queue.");
>>>>> +            goto out_free_vqs;
>>>>> +        }
>>>>> +    }
>>>>> +
>>>>> +    vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
>>>>> +
>>>>> +    if (!dev->cvq)
>>>>> +        return 0;
>>>>> +
>>>>> +    ctrl.hdr.class = VIRTIO_NET_CTRL_MQ;
>>>>> +    ctrl.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET;
>>>>> +    memcpy(ctrl.data, &dev->max_queue_pairs, sizeof(uint16_t));
>>>>> +
>>>>> +    dlen[0] = sizeof(uint16_t);
>>>>> +
>>>>> +    ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
>>>>> +    if (ret) {
>>>>> +        DRV_LOG(ERR, "Multiqueue configured but send command "
>>>>> +              "failed, this is too late now...");
>>>>> +        ret = -EINVAL;
>>>>> +        goto out_free_vqs;
>>>>> +    }
>>>>> +
>>>>> +    return 0;
>>>>> +out_free_vqs:
>>>>> +    rte_free(dev->vqs);
>>>>> +
>>>>> +    return ret;
>>>>> +}
>>>>> +
>>>>> +static int
>>>>> +virtio_vdpa_dev_config(int vid)
>>>>> +{
>>>>> +    int did, ret;
>>>>> +    struct internal_list *list;
>>>>> +    struct virtio_vdpa_device *dev;
>>>>> +
>>>>> +    did = rte_vhost_get_vdpa_device_id(vid);
>>>>> +    list = find_internal_resource_by_did(did);
>>>>> +    if (list == NULL) {
>>>>> +        DRV_LOG(ERR, "Invalid device id: %d", did);
>>>>> +        return -1;
>>>>> +    }
>>>>> +
>>>>> +    dev = list->dev;
>>>>> +    dev->vid = vid;
>>>>> +
>>>>> +    rte_spinlock_lock(&dev->lock);
>>>>> +
>>>>> +    ret = virtio_vdpa_dma_map(dev, 1);
>>>>> +    if (ret)
>>>>> +        goto out_unlock;
>>>>> +
>>>>> +    ret = virtio_vdpa_start(dev);
>>>>> +
>>>>> +    if (rte_vhost_host_notifier_ctrl(vid, true) != 0)
>>>>> +        DRV_LOG(NOTICE, "vDPA (%d): software relay is used.", did);
>>>>> +
>>>>> +out_unlock:
>>>>> +    rte_spinlock_unlock(&dev->lock);
>>>>> +
>>>>> +    return ret;
>>>>> +}
>>>>> +
>>>>>   static struct rte_vdpa_dev_ops virtio_vdpa_ops = {
>>>>>       .get_queue_num = virtio_vdpa_get_queue_num,
>>>>>       .get_features = virtio_vdpa_get_features,
>>>>>       .get_protocol_features = virtio_vdpa_get_protocol_features,
>>>>> +    .dev_conf = virtio_vdpa_dev_config,
>>>>>   };
>>>>>     static inline int
>>>>> -- 
>>>>> 2.21.0
>>>>>

  reply index

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-29  7:59 [dpdk-stable] [PATCH 00/15] Introduce Virtio vDPA driver Maxime Coquelin
2019-08-29  7:59 ` [dpdk-stable] [PATCH 01/15] vhost: remove vhost kernel header inclusion Maxime Coquelin
2019-09-02  6:03   ` Tiwei Bie
2019-09-03  7:24     ` Maxime Coquelin
2019-08-29  7:59 ` [dpdk-stable] [PATCH 02/15] vhost: configure vDPA as soon as the device is ready Maxime Coquelin
2019-09-02  8:34   ` Ye Xiaolong
2019-09-02  9:02     ` Wang, Xiao W
2019-09-03  7:34       ` Maxime Coquelin
2019-09-03 10:58         ` Wang, Xiao W
2019-08-29  7:59 ` [dpdk-stable] [PATCH 03/15] net/virtio: move control path fonctions in virtqueue file Maxime Coquelin
2019-09-02  6:05   ` Tiwei Bie
2019-08-29  7:59 ` [dpdk-stable] [PATCH 04/15] net/virtio: add virtio PCI subsystem device ID declaration Maxime Coquelin
2019-09-02  6:14   ` Tiwei Bie
2019-09-03  7:25     ` Maxime Coquelin
2019-08-29  7:59 ` [dpdk-stable] [PATCH 05/15] net/virtio: save notify bar ID in virtio HW struct Maxime Coquelin
2019-09-02  6:17   ` Tiwei Bie
2019-08-29  7:59 ` [dpdk-stable] [PATCH 06/15] net/virtio: add skeleton for virtio vDPA driver Maxime Coquelin
2019-09-02  6:27   ` Tiwei Bie
2019-09-03  7:25     ` Maxime Coquelin
2019-08-29  7:59 ` [dpdk-stable] [PATCH 07/15] net/virtio: add vDPA ops to get number of queue Maxime Coquelin
2019-09-02  6:32   ` Tiwei Bie
2019-08-29  7:59 ` [dpdk-stable] [PATCH 08/15] net/virtio: add virtio vDPA op to get features Maxime Coquelin
2019-09-02  6:43   ` Tiwei Bie
2019-09-03  7:27     ` Maxime Coquelin
2019-08-29  7:59 ` [dpdk-stable] [PATCH 09/15] net/virtio: add virtio vDPA op to get protocol features Maxime Coquelin
2019-09-02  6:46   ` Tiwei Bie
2019-08-29  7:59 ` [dpdk-stable] [PATCH 10/15] net/virtio: add vDPA op to configure and start the device Maxime Coquelin
2019-09-03  5:30   ` Tiwei Bie
2019-09-03  7:40     ` Maxime Coquelin
2019-09-03  8:49       ` Tiwei Bie
2019-09-04  4:06         ` Jason Wang
2019-09-04  6:56           ` Maxime Coquelin [this message]
2019-09-05  2:57             ` Tiwei Bie
2019-08-29  7:59 ` [dpdk-stable] [PATCH 11/15] net/virtio: add vDPA op to stop and close " Maxime Coquelin
2019-09-02  7:07   ` Tiwei Bie
2019-09-03  7:30     ` Maxime Coquelin
2019-08-29  7:59 ` [dpdk-stable] [PATCH 12/15] net/virtio: add vDPA op to set features Maxime Coquelin
2019-08-29  7:59 ` [dpdk-stable] [PATCH 13/15] net/virtio: add vDPA ops to get VFIO FDs Maxime Coquelin
2019-09-03  4:47   ` Tiwei Bie
2019-08-29  7:59 ` [dpdk-stable] [PATCH 14/15] net/virtio: add vDPA op to get notification area Maxime Coquelin
2019-09-03  5:02   ` Tiwei Bie
2019-09-03  7:36     ` Maxime Coquelin
2019-09-03  8:40       ` Tiwei Bie
2019-08-29  8:00 ` [dpdk-stable] [PATCH 15/15] doc: add documentation for Virtio vDPA driver Maxime Coquelin
2019-09-09 11:55 ` [dpdk-stable] [dpdk-dev] [PATCH 00/15] Introduce " Shahaf Shuler
2019-09-10  7:46   ` Maxime Coquelin
2019-09-10 13:44     ` Shahaf Shuler
2019-09-10 13:56       ` Maxime Coquelin
2019-09-11  5:15         ` Shahaf Shuler
2019-09-11  7:15           ` Maxime Coquelin
2019-10-24  6:32 ` [dpdk-stable] " Maxime Coquelin

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