netdev - Re: [PATCH v6 virtio 09/11] pds_vdpa: add support for vdpa and vdpamgmt interfaces

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Tue, 16 May 2023 12:35:16 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Shannon Nelson <shannon.nelson@....com>
Cc: jasowang@...hat.com, mst@...hat.com,
	virtualization@...ts.linux-foundation.org, brett.creeley@....com,
	netdev@...r.kernel.org, drivers@...sando.io
Subject: Re: [PATCH v6 virtio 09/11] pds_vdpa: add support for vdpa and
 vdpamgmt interfaces

On Mon, May 15, 2023 at 07:55:19PM -0700, Shannon Nelson wrote:
> This is the vDPA device support, where we advertise that we can
> support the virtio queues and deal with the configuration work
> through the pds_core's adminq.
> 
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
> Acked-by: Jason Wang <jasowang@...hat.com>

...

> @@ -21,12 +479,156 @@ static struct virtio_device_id pds_vdpa_id_table[] = {
>  static int pds_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
>  			    const struct vdpa_dev_set_config *add_config)
>  {
> -	return -EOPNOTSUPP;
> +	struct pds_vdpa_aux *vdpa_aux;
> +	struct pds_vdpa_device *pdsv;
> +	struct vdpa_mgmt_dev *mgmt;
> +	u16 fw_max_vqs, vq_pairs;
> +	struct device *dma_dev;
> +	struct pci_dev *pdev;
> +	struct device *dev;
> +	u8 mac[ETH_ALEN];
> +	int err;
> +	int i;
> +
> +	vdpa_aux = container_of(mdev, struct pds_vdpa_aux, vdpa_mdev);
> +	dev = &vdpa_aux->padev->aux_dev.dev;
> +	mgmt = &vdpa_aux->vdpa_mdev;
> +
> +	if (vdpa_aux->pdsv) {
> +		dev_warn(dev, "Multiple vDPA devices on a VF is not supported.\n");
> +		return -EOPNOTSUPP;
> +	}
> +
> +	pdsv = vdpa_alloc_device(struct pds_vdpa_device, vdpa_dev,
> +				 dev, &pds_vdpa_ops, 1, 1, name, false);
> +	if (IS_ERR(pdsv)) {
> +		dev_err(dev, "Failed to allocate vDPA structure: %pe\n", pdsv);
> +		return PTR_ERR(pdsv);
> +	}
> +
> +	vdpa_aux->pdsv = pdsv;
> +	pdsv->vdpa_aux = vdpa_aux;
> +
> +	pdev = vdpa_aux->padev->vf_pdev;
> +	dma_dev = &pdev->dev;
> +	pdsv->vdpa_dev.dma_dev = dma_dev;
> +
> +	pdsv->supported_features = mgmt->supported_features;
> +

> +	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
> +		u64 unsupp_features =
> +			add_config->device_features & ~mgmt->supported_features;
> +
> +		if (unsupp_features) {
> +			dev_err(dev, "Unsupported features: %#llx\n", unsupp_features);
> +			goto err_unmap;

Hi Shannon,

clang-16 W=1 reports that
err_unmap will return err
but err is uninitialised here.

> +		}
> +
> +		pdsv->supported_features = add_config->device_features;
> +	}

...

> +err_unmap:
> +	put_device(&pdsv->vdpa_dev.dev);
> +	vdpa_aux->pdsv = NULL;
> +	return err;
>  }

...