netdev - Re: [PATCH 2/3] vDPA/ifcvf: implement management netlink framework for ifcvf

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Date:   Mon, 5 Jul 2021 14:38:01 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 2/3] vDPA/ifcvf: implement management netlink framework
 for ifcvf



On 7/5/2021 2:34 PM, Michael S. Tsirkin wrote:
> On Mon, Jul 05, 2021 at 01:04:11PM +0800, Jason Wang wrote:
>>> +static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>>> +{
>>> +	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
>>> +	struct device *dev = &pdev->dev;
>>> +	struct ifcvf_adapter *adapter;
>>
>> adapter is not used.
> It's used in error handling below. It's not *initialized*.
sorry, my bad. I think I should move adapter related error handling code 
into ifcvf_vdpa_dev_add(),
probe() does not see adapter anymore, only struct ifcvf_vdpa_mgmt_dev.

Thanks
>
>>> +	u32 dev_type;
>>> +	int ret;
>>> +
>>> +	ifcvf_mgmt_dev = kzalloc(sizeof(struct ifcvf_vdpa_mgmt_dev), GFP_KERNEL);
>>> +	if (!ifcvf_mgmt_dev) {
>>> +		IFCVF_ERR(pdev, "Failed to alloc memory for the vDPA management device\n");
>>> +		return -ENOMEM;
>>> +	}
>>> +
>>> +	dev_type = get_dev_type(pdev);
>>> +	switch (dev_type) {
>>> +	case VIRTIO_ID_NET:
>>> +		ifcvf_mgmt_dev->mdev.id_table = id_table_net;
>>> +		break;
>>> +	case VIRTIO_ID_BLOCK:
>>> +		ifcvf_mgmt_dev->mdev.id_table = id_table_blk;
>>> +		break;
>>> +	default:
>>> +		IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", dev_type);
>>> +		ret = -EOPNOTSUPP;
>>> +		goto err;
>>> +	}
>>> +
>>> +	ifcvf_mgmt_dev->mdev.ops = &ifcvf_vdpa_mgmt_dev_ops;
>>> +	ifcvf_mgmt_dev->mdev.device = dev;
>>> +	ifcvf_mgmt_dev->pdev = pdev;
>>> +
>>> +	ret = pcim_enable_device(pdev);
>>> +	if (ret) {
>>> +		IFCVF_ERR(pdev, "Failed to enable device\n");
>>> +		goto err;
>>> +	}
>>> +
>>> +	ret = pcim_iomap_regions(pdev, BIT(0) | BIT(2) | BIT(4),
>>> +				 IFCVF_DRIVER_NAME);
>>> +	if (ret) {
>>> +		IFCVF_ERR(pdev, "Failed to request MMIO region\n");
>>> +		goto err;
>>> +	}
>>> +
>>> +	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
>>> +	if (ret) {
>>> +		IFCVF_ERR(pdev, "No usable DMA configuration\n");
>>> +		goto err;
>>> +	}
>>> +
>>> +	ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
>>> +	if (ret) {
>>> +		IFCVF_ERR(pdev,
>>> +			  "Failed for adding devres for freeing irq vectors\n");
>>> +		goto err;
>>> +	}
>>> +
>>> +	pci_set_master(pdev);
>>> +
>>> +	ret = vdpa_mgmtdev_register(&ifcvf_mgmt_dev->mdev);
>>> +	if (ret) {
>>> +		IFCVF_ERR(pdev,
>>> +			  "Failed to initialize the management interfaces\n");
>>>    		goto err;
>>>    	}
>>> @@ -533,14 +610,21 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>>>    err:
>>>    	put_device(&adapter->vdpa.dev);
>>> +	kfree(ifcvf_mgmt_dev);
>>>    	return ret;
>>>    }