linux-kernel - Re: [PATCH 2/3] vDPA/ifcvf: enable Intel C5000X-PL virtio-block for vDPA

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Message-ID: <c90a923f-7c8d-9a32-ce14-2370f85f1ba4@redhat.com>
Date:   Thu, 15 Apr 2021 14:31:34 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Zhu Lingshan <lingshan.zhu@...ux.intel.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>, mst@...hat.com,
        lulu@...hat.com, leonro@...dia.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] vDPA/ifcvf: enable Intel C5000X-PL virtio-block for
 vDPA


在 2021/4/15 下午1:55, Zhu Lingshan 写道:
>
>
> On 4/15/2021 11:34 AM, Jason Wang wrote:
>>
>> 在 2021/4/14 下午5:18, Zhu Lingshan 写道:
>>> This commit enabled Intel FPGA SmartNIC C5000X-PL virtio-block
>>> for vDPA.
>>>
>>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>>> ---
>>>   drivers/vdpa/ifcvf/ifcvf_base.h | 17 ++++++++++++++++-
>>>   drivers/vdpa/ifcvf/ifcvf_main.c | 10 +++++++++-
>>>   2 files changed, 25 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/vdpa/ifcvf/ifcvf_base.h 
>>> b/drivers/vdpa/ifcvf/ifcvf_base.h
>>> index 1c04cd256fa7..8b403522bf06 100644
>>> --- a/drivers/vdpa/ifcvf/ifcvf_base.h
>>> +++ b/drivers/vdpa/ifcvf/ifcvf_base.h
>>> @@ -15,6 +15,7 @@
>>>   #include <linux/pci_regs.h>
>>>   #include <linux/vdpa.h>
>>>   #include <uapi/linux/virtio_net.h>
>>> +#include <uapi/linux/virtio_blk.h>
>>>   #include <uapi/linux/virtio_config.h>
>>>   #include <uapi/linux/virtio_pci.h>
>>>   @@ -28,7 +29,12 @@
>>>   #define C5000X_PL_SUBSYS_VENDOR_ID    0x8086
>>>   #define C5000X_PL_SUBSYS_DEVICE_ID    0x0001
>>>   -#define IFCVF_SUPPORTED_FEATURES \
>>> +#define C5000X_PL_BLK_VENDOR_ID        0x1AF4
>>> +#define C5000X_PL_BLK_DEVICE_ID        0x1001
>>> +#define C5000X_PL_BLK_SUBSYS_VENDOR_ID    0x8086
>>> +#define C5000X_PL_BLK_SUBSYS_DEVICE_ID    0x0002
>>> +
>>> +#define IFCVF_NET_SUPPORTED_FEATURES \
>>>           ((1ULL << VIRTIO_NET_F_MAC)            | \
>>>            (1ULL << VIRTIO_F_ANY_LAYOUT)            | \
>>>            (1ULL << VIRTIO_F_VERSION_1)            | \
>>> @@ -37,6 +43,15 @@
>>>            (1ULL << VIRTIO_F_ACCESS_PLATFORM)        | \
>>>            (1ULL << VIRTIO_NET_F_MRG_RXBUF))
>>>   +#define IFCVF_BLK_SUPPORTED_FEATURES \
>>> +        ((1ULL << VIRTIO_BLK_F_SIZE_MAX)        | \
>>> +         (1ULL << VIRTIO_BLK_F_SEG_MAX)            | \
>>> +         (1ULL << VIRTIO_BLK_F_BLK_SIZE)        | \
>>> +         (1ULL << VIRTIO_BLK_F_TOPOLOGY)        | \
>>> +         (1ULL << VIRTIO_BLK_F_MQ)            | \
>>> +         (1ULL << VIRTIO_F_VERSION_1)            | \
>>> +         (1ULL << VIRTIO_F_ACCESS_PLATFORM))
>>
>>
>> I think we've discussed this sometime in the past but what's the 
>> reason for such whitelist consider there's already a get_features() 
>> implemention?
>>
>> E.g Any reason to block VIRTIO_BLK_F_WRITE_ZEROS or 
>> VIRTIO_F_RING_PACKED?
>>
>> Thanks
> The reason is some feature bits are supported in the device but not 
> supported by the driver, e.g, for virtio-net, mq & cq implementation 
> is not ready in the driver.


I understand the case of virtio-net but I wonder why we need this for 
block where we don't vq cvq.

Thanks


>
> Thanks!
>
>>
>>
>>> +
>>>   /* Only one queue pair for now. */
>>>   #define IFCVF_MAX_QUEUE_PAIRS    1
>>>   diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c 
>>> b/drivers/vdpa/ifcvf/ifcvf_main.c
>>> index 99b0a6b4c227..9b6a38b798fa 100644
>>> --- a/drivers/vdpa/ifcvf/ifcvf_main.c
>>> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
>>> @@ -171,7 +171,11 @@ static u64 ifcvf_vdpa_get_features(struct 
>>> vdpa_device *vdpa_dev)
>>>       struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
>>>       u64 features;
>>>   -    features = ifcvf_get_features(vf) & IFCVF_SUPPORTED_FEATURES;
>>> +    if (vf->dev_type == VIRTIO_ID_NET)
>>> +        features = ifcvf_get_features(vf) & 
>>> IFCVF_NET_SUPPORTED_FEATURES;
>>> +
>>> +    if (vf->dev_type == VIRTIO_ID_BLOCK)
>>> +        features = ifcvf_get_features(vf) & 
>>> IFCVF_BLK_SUPPORTED_FEATURES;
>>>         return features;
>>>   }
>>> @@ -509,6 +513,10 @@ static struct pci_device_id ifcvf_pci_ids[] = {
>>>                C5000X_PL_DEVICE_ID,
>>>                C5000X_PL_SUBSYS_VENDOR_ID,
>>>                C5000X_PL_SUBSYS_DEVICE_ID) },
>>> +    { PCI_DEVICE_SUB(C5000X_PL_BLK_VENDOR_ID,
>>> +             C5000X_PL_BLK_DEVICE_ID,
>>> +             C5000X_PL_BLK_SUBSYS_VENDOR_ID,
>>> +             C5000X_PL_BLK_SUBSYS_DEVICE_ID) },
>>>         { 0 },
>>>   };
>>
>