netdev - Re: [PATCH V3 6/6] vDPA: fix 'cast to restricted le16' warnings in vdpa.c

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Date:   Fri, 29 Jul 2022 17:20:17 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, parav@...dia.com, xieyongji@...edance.com,
        gautam.dawar@....com
Subject: Re: [PATCH V3 6/6] vDPA: fix 'cast to restricted le16' warnings in
 vdpa.c



On 7/29/2022 5:17 PM, Michael S. Tsirkin wrote:
> On Fri, Jul 29, 2022 at 05:07:11PM +0800, Zhu, Lingshan wrote:
>>
>> On 7/29/2022 4:53 PM, Michael S. Tsirkin wrote:
>>> On Fri, Jul 01, 2022 at 09:28:26PM +0800, Zhu Lingshan wrote:
>>>> This commit fixes spars warnings: cast to restricted __le16
>>>> in function vdpa_dev_net_config_fill() and
>>>> vdpa_fill_stats_rec()
>>>>
>>>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>>>> ---
>>>>    drivers/vdpa/vdpa.c | 6 +++---
>>>>    1 file changed, 3 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
>>>> index 846dd37f3549..ed49fe46a79e 100644
>>>> --- a/drivers/vdpa/vdpa.c
>>>> +++ b/drivers/vdpa/vdpa.c
>>>> @@ -825,11 +825,11 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
>>>>    		    config.mac))
>>>>    		return -EMSGSIZE;
>>>> -	val_u16 = le16_to_cpu(config.status);
>>>> +	val_u16 = __virtio16_to_cpu(true, config.status);
>>>>    	if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16))
>>>>    		return -EMSGSIZE;
>>>> -	val_u16 = le16_to_cpu(config.mtu);
>>>> +	val_u16 = __virtio16_to_cpu(true, config.mtu);
>>>>    	if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
>>>>    		return -EMSGSIZE;
>>> Wrong on BE platforms with legacy interface, isn't it?
>>> We generally don't handle legacy properly in VDPA so it's
>>> not a huge deal, but maybe add a comment at least?
>> Sure, I can add a comment here: this is for modern devices only.
>>
>> Thanks,
>> Zhu Lingshan
> Hmm. what "this" is for modern devices only here?
this cast, for LE modern devices.
>
>>>
>>>> @@ -911,7 +911,7 @@ static int vdpa_fill_stats_rec(struct vdpa_device *vdev, struct sk_buff *msg,
>>>>    	}
>>>>    	vdpa_get_config_unlocked(vdev, 0, &config, sizeof(config));
>>>> -	max_vqp = le16_to_cpu(config.max_virtqueue_pairs);
>>>> +	max_vqp = __virtio16_to_cpu(true, config.max_virtqueue_pairs);
>>>>    	if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, max_vqp))
>>>>    		return -EMSGSIZE;
>>>> -- 
>>>> 2.31.1