virtio-crypto: add data queue processing handler
Introduces VirtIOCryptoReq structure to store crypto request so that we can easily support asynchronous crypto operation in the future. At present, we only support cipher and algorithm chaining. Signed-off-by: Gonglei <arei.gonglei@huawei.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
parent
59c360ca42
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04b9b37edd
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@ -320,6 +320,362 @@ static void virtio_crypto_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
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} /* end for loop */
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}
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static void virtio_crypto_init_request(VirtIOCrypto *vcrypto, VirtQueue *vq,
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VirtIOCryptoReq *req)
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{
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req->vcrypto = vcrypto;
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req->vq = vq;
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req->in = NULL;
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req->in_iov = NULL;
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req->in_num = 0;
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req->in_len = 0;
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req->flags = CRYPTODEV_BACKEND_ALG__MAX;
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req->u.sym_op_info = NULL;
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}
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static void virtio_crypto_free_request(VirtIOCryptoReq *req)
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{
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if (req) {
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if (req->flags == CRYPTODEV_BACKEND_ALG_SYM) {
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g_free(req->u.sym_op_info);
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}
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g_free(req);
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}
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}
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static void
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virtio_crypto_sym_input_data_helper(VirtIODevice *vdev,
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VirtIOCryptoReq *req,
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uint32_t status,
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CryptoDevBackendSymOpInfo *sym_op_info)
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{
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size_t s, len;
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if (status != VIRTIO_CRYPTO_OK) {
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return;
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}
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len = sym_op_info->dst_len;
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/* Save the cipher result */
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s = iov_from_buf(req->in_iov, req->in_num, 0, sym_op_info->dst, len);
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if (s != len) {
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virtio_error(vdev, "virtio-crypto dest data incorrect");
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return;
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}
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iov_discard_front(&req->in_iov, &req->in_num, len);
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if (sym_op_info->op_type ==
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VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING) {
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/* Save the digest result */
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s = iov_from_buf(req->in_iov, req->in_num, 0,
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sym_op_info->digest_result,
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sym_op_info->digest_result_len);
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if (s != sym_op_info->digest_result_len) {
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virtio_error(vdev, "virtio-crypto digest result incorrect");
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}
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}
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}
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static void virtio_crypto_req_complete(VirtIOCryptoReq *req, uint8_t status)
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{
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VirtIOCrypto *vcrypto = req->vcrypto;
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VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
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if (req->flags == CRYPTODEV_BACKEND_ALG_SYM) {
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virtio_crypto_sym_input_data_helper(vdev, req, status,
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req->u.sym_op_info);
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}
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stb_p(&req->in->status, status);
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virtqueue_push(req->vq, &req->elem, req->in_len);
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virtio_notify(vdev, req->vq);
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}
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static VirtIOCryptoReq *
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virtio_crypto_get_request(VirtIOCrypto *s, VirtQueue *vq)
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{
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VirtIOCryptoReq *req = virtqueue_pop(vq, sizeof(VirtIOCryptoReq));
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if (req) {
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virtio_crypto_init_request(s, vq, req);
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}
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return req;
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}
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static CryptoDevBackendSymOpInfo *
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virtio_crypto_sym_op_helper(VirtIODevice *vdev,
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struct virtio_crypto_cipher_para *cipher_para,
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struct virtio_crypto_alg_chain_data_para *alg_chain_para,
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struct iovec *iov, unsigned int out_num)
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{
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VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
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CryptoDevBackendSymOpInfo *op_info;
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uint32_t src_len = 0, dst_len = 0;
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uint32_t iv_len = 0;
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uint32_t aad_len = 0, hash_result_len = 0;
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uint32_t hash_start_src_offset = 0, len_to_hash = 0;
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uint32_t cipher_start_src_offset = 0, len_to_cipher = 0;
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size_t max_len, curr_size = 0;
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size_t s;
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/* Plain cipher */
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if (cipher_para) {
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iv_len = ldl_le_p(&cipher_para->iv_len);
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src_len = ldl_le_p(&cipher_para->src_data_len);
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dst_len = ldl_le_p(&cipher_para->dst_data_len);
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} else if (alg_chain_para) { /* Algorithm chain */
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iv_len = ldl_le_p(&alg_chain_para->iv_len);
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src_len = ldl_le_p(&alg_chain_para->src_data_len);
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dst_len = ldl_le_p(&alg_chain_para->dst_data_len);
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aad_len = ldl_le_p(&alg_chain_para->aad_len);
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hash_result_len = ldl_le_p(&alg_chain_para->hash_result_len);
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hash_start_src_offset = ldl_le_p(
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&alg_chain_para->hash_start_src_offset);
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cipher_start_src_offset = ldl_le_p(
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&alg_chain_para->cipher_start_src_offset);
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len_to_cipher = ldl_le_p(&alg_chain_para->len_to_cipher);
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len_to_hash = ldl_le_p(&alg_chain_para->len_to_hash);
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} else {
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return NULL;
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}
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max_len = iv_len + aad_len + src_len + dst_len + hash_result_len;
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if (unlikely(max_len > vcrypto->conf.max_size)) {
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virtio_error(vdev, "virtio-crypto too big length");
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return NULL;
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}
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op_info = g_malloc0(sizeof(CryptoDevBackendSymOpInfo) + max_len);
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op_info->iv_len = iv_len;
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op_info->src_len = src_len;
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op_info->dst_len = dst_len;
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op_info->aad_len = aad_len;
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op_info->digest_result_len = hash_result_len;
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op_info->hash_start_src_offset = hash_start_src_offset;
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op_info->len_to_hash = len_to_hash;
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op_info->cipher_start_src_offset = cipher_start_src_offset;
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op_info->len_to_cipher = len_to_cipher;
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/* Handle the initilization vector */
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if (op_info->iv_len > 0) {
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DPRINTF("iv_len=%" PRIu32 "\n", op_info->iv_len);
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op_info->iv = op_info->data + curr_size;
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s = iov_to_buf(iov, out_num, 0, op_info->iv, op_info->iv_len);
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if (unlikely(s != op_info->iv_len)) {
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virtio_error(vdev, "virtio-crypto iv incorrect");
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goto err;
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}
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iov_discard_front(&iov, &out_num, op_info->iv_len);
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curr_size += op_info->iv_len;
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}
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/* Handle additional authentication data if exists */
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if (op_info->aad_len > 0) {
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DPRINTF("aad_len=%" PRIu32 "\n", op_info->aad_len);
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op_info->aad_data = op_info->data + curr_size;
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s = iov_to_buf(iov, out_num, 0, op_info->aad_data, op_info->aad_len);
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if (unlikely(s != op_info->aad_len)) {
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virtio_error(vdev, "virtio-crypto additional auth data incorrect");
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goto err;
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}
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iov_discard_front(&iov, &out_num, op_info->aad_len);
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curr_size += op_info->aad_len;
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}
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/* Handle the source data */
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if (op_info->src_len > 0) {
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DPRINTF("src_len=%" PRIu32 "\n", op_info->src_len);
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op_info->src = op_info->data + curr_size;
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s = iov_to_buf(iov, out_num, 0, op_info->src, op_info->src_len);
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if (unlikely(s != op_info->src_len)) {
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virtio_error(vdev, "virtio-crypto source data incorrect");
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goto err;
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}
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iov_discard_front(&iov, &out_num, op_info->src_len);
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curr_size += op_info->src_len;
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}
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/* Handle the destination data */
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op_info->dst = op_info->data + curr_size;
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curr_size += op_info->dst_len;
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DPRINTF("dst_len=%" PRIu32 "\n", op_info->dst_len);
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/* Handle the hash digest result */
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if (hash_result_len > 0) {
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DPRINTF("hash_result_len=%" PRIu32 "\n", hash_result_len);
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op_info->digest_result = op_info->data + curr_size;
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}
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return op_info;
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err:
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g_free(op_info);
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return NULL;
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}
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static int
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virtio_crypto_handle_sym_req(VirtIOCrypto *vcrypto,
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struct virtio_crypto_sym_data_req *req,
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CryptoDevBackendSymOpInfo **sym_op_info,
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struct iovec *iov, unsigned int out_num)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
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uint32_t op_type;
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CryptoDevBackendSymOpInfo *op_info;
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op_type = ldl_le_p(&req->op_type);
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if (op_type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
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op_info = virtio_crypto_sym_op_helper(vdev, &req->u.cipher.para,
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NULL, iov, out_num);
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if (!op_info) {
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return -EFAULT;
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}
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op_info->op_type = op_type;
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} else if (op_type == VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING) {
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op_info = virtio_crypto_sym_op_helper(vdev, NULL,
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&req->u.chain.para,
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iov, out_num);
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if (!op_info) {
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return -EFAULT;
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}
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op_info->op_type = op_type;
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} else {
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/* VIRTIO_CRYPTO_SYM_OP_NONE */
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error_report("virtio-crypto unsupported cipher type");
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return -VIRTIO_CRYPTO_NOTSUPP;
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}
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*sym_op_info = op_info;
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return 0;
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}
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static int
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virtio_crypto_handle_request(VirtIOCryptoReq *request)
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{
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VirtIOCrypto *vcrypto = request->vcrypto;
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VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
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VirtQueueElement *elem = &request->elem;
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int queue_index = virtio_crypto_vq2q(virtio_get_queue_index(request->vq));
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struct virtio_crypto_op_data_req req;
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int ret;
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struct iovec *in_iov;
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struct iovec *out_iov;
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unsigned in_num;
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unsigned out_num;
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uint32_t opcode;
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uint8_t status = VIRTIO_CRYPTO_ERR;
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uint64_t session_id;
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CryptoDevBackendSymOpInfo *sym_op_info = NULL;
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Error *local_err = NULL;
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if (elem->out_num < 1 || elem->in_num < 1) {
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virtio_error(vdev, "virtio-crypto dataq missing headers");
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return -1;
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}
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out_num = elem->out_num;
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out_iov = elem->out_sg;
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in_num = elem->in_num;
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in_iov = elem->in_sg;
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if (unlikely(iov_to_buf(out_iov, out_num, 0, &req, sizeof(req))
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!= sizeof(req))) {
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virtio_error(vdev, "virtio-crypto request outhdr too short");
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return -1;
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}
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iov_discard_front(&out_iov, &out_num, sizeof(req));
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if (in_iov[in_num - 1].iov_len <
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sizeof(struct virtio_crypto_inhdr)) {
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virtio_error(vdev, "virtio-crypto request inhdr too short");
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return -1;
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}
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/* We always touch the last byte, so just see how big in_iov is. */
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request->in_len = iov_size(in_iov, in_num);
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request->in = (void *)in_iov[in_num - 1].iov_base
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+ in_iov[in_num - 1].iov_len
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- sizeof(struct virtio_crypto_inhdr);
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iov_discard_back(in_iov, &in_num, sizeof(struct virtio_crypto_inhdr));
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/*
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* The length of operation result, including dest_data
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* and digest_result if exists.
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*/
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request->in_num = in_num;
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request->in_iov = in_iov;
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opcode = ldl_le_p(&req.header.opcode);
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session_id = ldq_le_p(&req.header.session_id);
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switch (opcode) {
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case VIRTIO_CRYPTO_CIPHER_ENCRYPT:
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case VIRTIO_CRYPTO_CIPHER_DECRYPT:
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ret = virtio_crypto_handle_sym_req(vcrypto,
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&req.u.sym_req,
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&sym_op_info,
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out_iov, out_num);
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/* Serious errors, need to reset virtio crypto device */
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if (ret == -EFAULT) {
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return -1;
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} else if (ret == -VIRTIO_CRYPTO_NOTSUPP) {
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virtio_crypto_req_complete(request, VIRTIO_CRYPTO_NOTSUPP);
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virtio_crypto_free_request(request);
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} else {
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sym_op_info->session_id = session_id;
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/* Set request's parameter */
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request->flags = CRYPTODEV_BACKEND_ALG_SYM;
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request->u.sym_op_info = sym_op_info;
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ret = cryptodev_backend_sym_operation(vcrypto->cryptodev,
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sym_op_info, queue_index, &local_err);
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if (ret < 0) {
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status = VIRTIO_CRYPTO_ERR;
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if (local_err) {
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error_report_err(local_err);
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}
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} else { /* ret >= 0 */
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status = VIRTIO_CRYPTO_OK;
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}
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virtio_crypto_req_complete(request, status);
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virtio_crypto_free_request(request);
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}
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break;
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case VIRTIO_CRYPTO_HASH:
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case VIRTIO_CRYPTO_MAC:
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case VIRTIO_CRYPTO_AEAD_ENCRYPT:
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case VIRTIO_CRYPTO_AEAD_DECRYPT:
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default:
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error_report("virtio-crypto unsupported dataq opcode: %u",
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opcode);
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virtio_crypto_req_complete(request, VIRTIO_CRYPTO_NOTSUPP);
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virtio_crypto_free_request(request);
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}
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return 0;
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}
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static void virtio_crypto_handle_dataq(VirtIODevice *vdev, VirtQueue *vq)
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{
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VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
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VirtIOCryptoReq *req;
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while ((req = virtio_crypto_get_request(vcrypto, vq))) {
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if (virtio_crypto_handle_request(req) < 0) {
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virtqueue_detach_element(req->vq, &req->elem, 0);
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virtio_crypto_free_request(req);
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break;
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}
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}
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}
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static uint64_t virtio_crypto_get_features(VirtIODevice *vdev,
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uint64_t features,
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Error **errp)
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@ -384,7 +740,7 @@ static void virtio_crypto_device_realize(DeviceState *dev, Error **errp)
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vcrypto->curr_queues = 1;
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for (i = 0; i < vcrypto->max_queues; i++) {
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virtio_add_queue(vdev, 1024, NULL);
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virtio_add_queue(vdev, 1024, virtio_crypto_handle_dataq);
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}
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vcrypto->ctrl_vq = virtio_add_queue(vdev, 64, virtio_crypto_handle_ctrl);
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@ -65,6 +65,10 @@ typedef struct VirtIOCryptoReq {
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VirtQueueElement elem;
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/* flags of operation, such as type of algorithm */
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uint32_t flags;
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struct virtio_crypto_inhdr *in;
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struct iovec *in_iov; /* Head address of dest iovec */
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unsigned int in_num; /* Number of dest iovec */
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size_t in_len;
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VirtQueue *vq;
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struct VirtIOCrypto *vcrypto;
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union {
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