linux-kernel - Re: [Qemu-devel] [PATCH v7 1/1] crypto: add virtio-crypto driver

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Date:   Wed, 14 Dec 2016 16:38:33 +0100
From:   Halil Pasic <pasic@...ux.vnet.ibm.com>
To:     Gonglei <arei.gonglei@...wei.com>, linux-kernel@...r.kernel.org,
        qemu-devel@...gnu.org, virtio-dev@...ts.oasis-open.org,
        virtualization@...ts.linux-foundation.org,
        linux-crypto@...r.kernel.org
Cc:     weidong.huang@...wei.com, claudio.fontana@...wei.com,
        mst@...hat.com, luonengjun@...wei.com, hanweidong@...wei.com,
        xin.zeng@...el.com, xuquan8@...wei.com, wanzongshun@...wei.com,
        stefanha@...hat.com, jianjay.zhou@...wei.com,
        cornelia.huck@...ibm.com, longpeng2@...wei.com,
        arei.gonglei@...mail.com, davem@...emloft.net, wu.wubin@...wei.com,
        herbert@...dor.apana.org.au
Subject: Re: [Qemu-devel] [PATCH v7 1/1] crypto: add virtio-crypto driver



On 12/14/2016 12:50 PM, Gonglei wrote:
> diff --git a/drivers/crypto/virtio/virtio_crypto_core.c b/drivers/crypto/virtio/virtio_crypto_core.c
> new file mode 100644
> index 0000000..c0854a1
> --- /dev/null
> +++ b/drivers/crypto/virtio/virtio_crypto_core.c
> @@ -0,0 +1,474 @@
[..]
> +
> +static void virtcrypto_dataq_callback(struct virtqueue *vq)
> +{
> +	struct virtio_crypto *vcrypto = vq->vdev->priv;
> +	struct virtio_crypto_request *vc_req;
> +	unsigned long flags;
> +	unsigned int len;
> +	struct ablkcipher_request *ablk_req;
> +	int error;
> +
> +	spin_lock_irqsave(&vcrypto->lock, flags);

Would it make sense to use a per virtqueue lock
like in virtio_blk for example instead of locking on the whole
device? OK, it seems you use only one dataqueue, so it
may not be that relevant.

> +	do {
> +		virtqueue_disable_cb(vq);
> +		while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
> +			if (vc_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
> +				switch (vc_req->status) {
> +				case VIRTIO_CRYPTO_OK:
> +					error = 0;
> +					break;
> +				case VIRTIO_CRYPTO_INVSESS:
> +				case VIRTIO_CRYPTO_ERR:
> +					error = -EINVAL;
> +					break;
> +				case VIRTIO_CRYPTO_BADMSG:
> +					error = -EBADMSG;
> +					break;
> +				default:
> +					error = -EIO;
> +					break;
> +				}
> +				ablk_req = vc_req->ablkcipher_req;
> +				virtcrypto_clear_request(vc_req);
> +
> +				spin_unlock_irqrestore(&vcrypto->lock, flags);
> +				/* Finish the encrypt or decrypt process */
> +				ablk_req->base.complete(&ablk_req->base, error);
> +				spin_lock_irqsave(&vcrypto->lock, flags);
> +			}
> +		}
> +	} while (!virtqueue_enable_cb(vq));
> +	spin_unlock_irqrestore(&vcrypto->lock, flags);
> +}