X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_vhost%2Fvhost_crypto.c;h=684fddc30b478cdfbd94465a239576006a5eb7c9;hb=c8a1a172ae2b4535b57bcf194a731334246a5a35;hp=4c256284e8b4bac71189f2f5c297c763d858ee65;hpb=2017bc33561af8e9880f077cef541ea947a06de0;p=dpdk.git

diff --git a/lib/librte_vhost/vhost_crypto.c b/lib/librte_vhost/vhost_crypto.c
index 4c256284e8..684fddc30b 100644
--- a/lib/librte_vhost/vhost_crypto.c
+++ b/lib/librte_vhost/vhost_crypto.c
@@ -42,119 +42,111 @@
 		(1 << VIRTIO_CRYPTO_SERVICE_MAC) |			\
 		(1 << VIRTIO_NET_F_CTRL_VQ))
 
-#define GPA_TO_VVA(t, m, a, l)	((t)(uintptr_t)rte_vhost_va_from_guest_pa(m, a, l))
+#define IOVA_TO_VVA(t, r, a, l, p)					\
+	((t)(uintptr_t)vhost_iova_to_vva(r->dev, r->vq, a, l, p))
 
 static int
-cipher_algo_transform(uint32_t virtio_cipher_algo)
+cipher_algo_transform(uint32_t virtio_cipher_algo,
+		enum rte_crypto_cipher_algorithm *algo)
 {
-	int ret;
-
 	switch (virtio_cipher_algo) {
 	case VIRTIO_CRYPTO_CIPHER_AES_CBC:
-		ret = RTE_CRYPTO_CIPHER_AES_CBC;
+		*algo = RTE_CRYPTO_CIPHER_AES_CBC;
 		break;
 	case VIRTIO_CRYPTO_CIPHER_AES_CTR:
-		ret = RTE_CRYPTO_CIPHER_AES_CTR;
+		*algo = RTE_CRYPTO_CIPHER_AES_CTR;
 		break;
 	case VIRTIO_CRYPTO_CIPHER_DES_ECB:
-		ret = -VIRTIO_CRYPTO_NOTSUPP;
+		*algo = -VIRTIO_CRYPTO_NOTSUPP;
 		break;
 	case VIRTIO_CRYPTO_CIPHER_DES_CBC:
-		ret = RTE_CRYPTO_CIPHER_DES_CBC;
+		*algo = RTE_CRYPTO_CIPHER_DES_CBC;
 		break;
 	case VIRTIO_CRYPTO_CIPHER_3DES_ECB:
-		ret = RTE_CRYPTO_CIPHER_3DES_ECB;
+		*algo = RTE_CRYPTO_CIPHER_3DES_ECB;
 		break;
 	case VIRTIO_CRYPTO_CIPHER_3DES_CBC:
-		ret = RTE_CRYPTO_CIPHER_3DES_CBC;
+		*algo = RTE_CRYPTO_CIPHER_3DES_CBC;
 		break;
 	case VIRTIO_CRYPTO_CIPHER_3DES_CTR:
-		ret = RTE_CRYPTO_CIPHER_3DES_CTR;
+		*algo = RTE_CRYPTO_CIPHER_3DES_CTR;
 		break;
 	case VIRTIO_CRYPTO_CIPHER_KASUMI_F8:
-		ret = RTE_CRYPTO_CIPHER_KASUMI_F8;
+		*algo = RTE_CRYPTO_CIPHER_KASUMI_F8;
 		break;
 	case VIRTIO_CRYPTO_CIPHER_SNOW3G_UEA2:
-		ret = RTE_CRYPTO_CIPHER_SNOW3G_UEA2;
+		*algo = RTE_CRYPTO_CIPHER_SNOW3G_UEA2;
 		break;
 	case VIRTIO_CRYPTO_CIPHER_AES_F8:
-		ret = RTE_CRYPTO_CIPHER_AES_F8;
+		*algo = RTE_CRYPTO_CIPHER_AES_F8;
 		break;
 	case VIRTIO_CRYPTO_CIPHER_AES_XTS:
-		ret = RTE_CRYPTO_CIPHER_AES_XTS;
+		*algo = RTE_CRYPTO_CIPHER_AES_XTS;
 		break;
 	case VIRTIO_CRYPTO_CIPHER_ZUC_EEA3:
-		ret = RTE_CRYPTO_CIPHER_ZUC_EEA3;
+		*algo = RTE_CRYPTO_CIPHER_ZUC_EEA3;
 		break;
 	default:
-		ret = -VIRTIO_CRYPTO_BADMSG;
+		return -VIRTIO_CRYPTO_BADMSG;
 		break;
 	}
 
-	return ret;
+	return 0;
 }
 
 static int
-auth_algo_transform(uint32_t virtio_auth_algo)
+auth_algo_transform(uint32_t virtio_auth_algo,
+		enum rte_crypto_auth_algorithm *algo)
 {
-	int ret;
-
 	switch (virtio_auth_algo) {
-
 	case VIRTIO_CRYPTO_NO_MAC:
-		ret = RTE_CRYPTO_AUTH_NULL;
+		*algo = RTE_CRYPTO_AUTH_NULL;
 		break;
 	case VIRTIO_CRYPTO_MAC_HMAC_MD5:
-		ret = RTE_CRYPTO_AUTH_MD5_HMAC;
+		*algo = RTE_CRYPTO_AUTH_MD5_HMAC;
 		break;
 	case VIRTIO_CRYPTO_MAC_HMAC_SHA1:
-		ret = RTE_CRYPTO_AUTH_SHA1_HMAC;
+		*algo = RTE_CRYPTO_AUTH_SHA1_HMAC;
 		break;
 	case VIRTIO_CRYPTO_MAC_HMAC_SHA_224:
-		ret = RTE_CRYPTO_AUTH_SHA224_HMAC;
+		*algo = RTE_CRYPTO_AUTH_SHA224_HMAC;
 		break;
 	case VIRTIO_CRYPTO_MAC_HMAC_SHA_256:
-		ret = RTE_CRYPTO_AUTH_SHA256_HMAC;
+		*algo = RTE_CRYPTO_AUTH_SHA256_HMAC;
 		break;
 	case VIRTIO_CRYPTO_MAC_HMAC_SHA_384:
-		ret = RTE_CRYPTO_AUTH_SHA384_HMAC;
+		*algo = RTE_CRYPTO_AUTH_SHA384_HMAC;
 		break;
 	case VIRTIO_CRYPTO_MAC_HMAC_SHA_512:
-		ret = RTE_CRYPTO_AUTH_SHA512_HMAC;
-		break;
-	case VIRTIO_CRYPTO_MAC_CMAC_3DES:
-		ret = -VIRTIO_CRYPTO_NOTSUPP;
+		*algo = RTE_CRYPTO_AUTH_SHA512_HMAC;
 		break;
 	case VIRTIO_CRYPTO_MAC_CMAC_AES:
-		ret = RTE_CRYPTO_AUTH_AES_CMAC;
+		*algo = RTE_CRYPTO_AUTH_AES_CMAC;
 		break;
 	case VIRTIO_CRYPTO_MAC_KASUMI_F9:
-		ret = RTE_CRYPTO_AUTH_KASUMI_F9;
+		*algo = RTE_CRYPTO_AUTH_KASUMI_F9;
 		break;
 	case VIRTIO_CRYPTO_MAC_SNOW3G_UIA2:
-		ret = RTE_CRYPTO_AUTH_SNOW3G_UIA2;
+		*algo = RTE_CRYPTO_AUTH_SNOW3G_UIA2;
 		break;
 	case VIRTIO_CRYPTO_MAC_GMAC_AES:
-		ret = RTE_CRYPTO_AUTH_AES_GMAC;
-		break;
-	case VIRTIO_CRYPTO_MAC_GMAC_TWOFISH:
-		ret = -VIRTIO_CRYPTO_NOTSUPP;
+		*algo = RTE_CRYPTO_AUTH_AES_GMAC;
 		break;
 	case VIRTIO_CRYPTO_MAC_CBCMAC_AES:
-		ret = RTE_CRYPTO_AUTH_AES_CBC_MAC;
-		break;
-	case VIRTIO_CRYPTO_MAC_CBCMAC_KASUMI_F9:
-		ret = -VIRTIO_CRYPTO_NOTSUPP;
+		*algo = RTE_CRYPTO_AUTH_AES_CBC_MAC;
 		break;
 	case VIRTIO_CRYPTO_MAC_XCBC_AES:
-		ret = RTE_CRYPTO_AUTH_AES_XCBC_MAC;
+		*algo = RTE_CRYPTO_AUTH_AES_XCBC_MAC;
 		break;
+	case VIRTIO_CRYPTO_MAC_CMAC_3DES:
+	case VIRTIO_CRYPTO_MAC_GMAC_TWOFISH:
+	case VIRTIO_CRYPTO_MAC_CBCMAC_KASUMI_F9:
+		return -VIRTIO_CRYPTO_NOTSUPP;
 	default:
-		ret = -VIRTIO_CRYPTO_BADMSG;
-		break;
+		return -VIRTIO_CRYPTO_BADMSG;
 	}
 
-	return ret;
+	return 0;
 }
 
 static int get_iv_len(enum rte_crypto_cipher_algorithm algo)
@@ -197,6 +189,8 @@ struct vhost_crypto {
 	struct rte_hash *session_map;
 	struct rte_mempool *mbuf_pool;
 	struct rte_mempool *sess_pool;
+	struct rte_mempool *sess_priv_pool;
+	struct rte_mempool *wb_pool;
 
 	/** DPDK cryptodev ID */
 	uint8_t cid;
@@ -214,13 +208,20 @@ struct vhost_crypto {
 	uint8_t option;
 } __rte_cache_aligned;
 
+struct vhost_crypto_writeback_data {
+	uint8_t *src;
+	uint8_t *dst;
+	uint64_t len;
+	struct vhost_crypto_writeback_data *next;
+};
+
 struct vhost_crypto_data_req {
 	struct vring_desc *head;
-	struct rte_vhost_memory *mem;
+	struct virtio_net *dev;
 	struct virtio_crypto_inhdr *inhdr;
 	struct vhost_virtqueue *vq;
-	struct vring_desc *wb_desc;
-	uint16_t wb_len;
+	struct vhost_crypto_writeback_data *wb;
+	struct rte_mempool *wb_pool;
 	uint16_t desc_idx;
 	uint16_t len;
 	uint16_t zero_copy;
@@ -232,12 +233,11 @@ transform_cipher_param(struct rte_crypto_sym_xform *xform,
 {
 	int ret;
 
-	ret = cipher_algo_transform(param->cipher_algo);
+	ret = cipher_algo_transform(param->cipher_algo, &xform->cipher.algo);
 	if (unlikely(ret < 0))
 		return ret;
 
 	xform->type = RTE_CRYPTO_SYM_XFORM_CIPHER;
-	xform->cipher.algo = (uint32_t)ret;
 	xform->cipher.key.length = param->cipher_key_len;
 	if (xform->cipher.key.length > 0)
 		xform->cipher.key.data = param->cipher_key_buf;
@@ -283,11 +283,11 @@ transform_chain_param(struct rte_crypto_sym_xform *xforms,
 	}
 
 	/* cipher */
-	ret = cipher_algo_transform(param->cipher_algo);
+	ret = cipher_algo_transform(param->cipher_algo,
+			&xform_cipher->cipher.algo);
 	if (unlikely(ret < 0))
 		return ret;
 	xform_cipher->type = RTE_CRYPTO_SYM_XFORM_CIPHER;
-	xform_cipher->cipher.algo = (uint32_t)ret;
 	xform_cipher->cipher.key.length = param->cipher_key_len;
 	xform_cipher->cipher.key.data = param->cipher_key_buf;
 	ret = get_iv_len(xform_cipher->cipher.algo);
@@ -298,10 +298,9 @@ transform_chain_param(struct rte_crypto_sym_xform *xforms,
 
 	/* auth */
 	xform_auth->type = RTE_CRYPTO_SYM_XFORM_AUTH;
-	ret = auth_algo_transform(param->hash_algo);
+	ret = auth_algo_transform(param->hash_algo, &xform_auth->auth.algo);
 	if (unlikely(ret < 0))
 		return ret;
-	xform_auth->auth.algo = (uint32_t)ret;
 	xform_auth->auth.digest_length = param->digest_len;
 	xform_auth->auth.key.length = param->auth_key_len;
 	xform_auth->auth.key.data = param->auth_key_buf;
@@ -360,7 +359,7 @@ vhost_crypto_create_sess(struct vhost_crypto *vcrypto,
 	}
 
 	if (rte_cryptodev_sym_session_init(vcrypto->cid, session, &xform1,
-			vcrypto->sess_pool) < 0) {
+			vcrypto->sess_priv_pool) < 0) {
 		VC_LOG_ERR("Failed to initialize session");
 		sess_param->session_id = -VIRTIO_CRYPTO_ERR;
 		return;
@@ -424,46 +423,56 @@ vhost_crypto_close_sess(struct vhost_crypto *vcrypto, uint64_t session_id)
 	return 0;
 }
 
-static int
-vhost_crypto_msg_post_handler(int vid, void *msg, uint32_t *require_reply)
+static enum rte_vhost_msg_result
+vhost_crypto_msg_post_handler(int vid, void *msg)
 {
 	struct virtio_net *dev = get_device(vid);
 	struct vhost_crypto *vcrypto;
 	VhostUserMsg *vmsg = msg;
-	int ret = 0;
+	enum rte_vhost_msg_result ret = RTE_VHOST_MSG_RESULT_OK;
 
-	if (dev == NULL || require_reply == NULL) {
+	if (dev == NULL) {
 		VC_LOG_ERR("Invalid vid %i", vid);
-		return -EINVAL;
+		return RTE_VHOST_MSG_RESULT_ERR;
 	}
 
 	vcrypto = dev->extern_data;
 	if (vcrypto == NULL) {
 		VC_LOG_ERR("Cannot find required data, is it initialized?");
-		return -ENOENT;
+		return RTE_VHOST_MSG_RESULT_ERR;
 	}
 
-	*require_reply = 0;
-
-	if (vmsg->request.master == VHOST_USER_CRYPTO_CREATE_SESS) {
+	switch (vmsg->request.master) {
+	case VHOST_USER_CRYPTO_CREATE_SESS:
 		vhost_crypto_create_sess(vcrypto,
 				&vmsg->payload.crypto_session);
-		*require_reply = 1;
-	} else if (vmsg->request.master == VHOST_USER_CRYPTO_CLOSE_SESS)
-		ret = vhost_crypto_close_sess(vcrypto, vmsg->payload.u64);
-	else
-		ret = -EINVAL;
+		vmsg->fd_num = 0;
+		ret = RTE_VHOST_MSG_RESULT_REPLY;
+		break;
+	case VHOST_USER_CRYPTO_CLOSE_SESS:
+		if (vhost_crypto_close_sess(vcrypto, vmsg->payload.u64))
+			ret = RTE_VHOST_MSG_RESULT_ERR;
+		break;
+	default:
+		ret = RTE_VHOST_MSG_RESULT_NOT_HANDLED;
+		break;
+	}
 
 	return ret;
 }
 
 static __rte_always_inline struct vring_desc *
-find_write_desc(struct vring_desc *head, struct vring_desc *desc)
+find_write_desc(struct vring_desc *head, struct vring_desc *desc,
+		uint32_t *nb_descs, uint32_t vq_size)
 {
 	if (desc->flags & VRING_DESC_F_WRITE)
 		return desc;
 
 	while (desc->flags & VRING_DESC_F_NEXT) {
+		if (unlikely(*nb_descs == 0 || desc->next >= vq_size))
+			return NULL;
+		(*nb_descs)--;
+
 		desc = &head[desc->next];
 		if (desc->flags & VRING_DESC_F_WRITE)
 			return desc;
@@ -473,18 +482,23 @@ find_write_desc(struct vring_desc *head, struct vring_desc *desc)
 }
 
 static struct virtio_crypto_inhdr *
-reach_inhdr(struct vring_desc *head, struct rte_vhost_memory *mem,
-		struct vring_desc *desc)
+reach_inhdr(struct vhost_crypto_data_req *vc_req, struct vring_desc *desc,
+		uint32_t *nb_descs, uint32_t vq_size)
 {
 	uint64_t dlen;
 	struct virtio_crypto_inhdr *inhdr;
 
-	while (desc->flags & VRING_DESC_F_NEXT)
-		desc = &head[desc->next];
+	while (desc->flags & VRING_DESC_F_NEXT) {
+		if (unlikely(*nb_descs == 0 || desc->next >= vq_size))
+			return NULL;
+		(*nb_descs)--;
+		desc = &vc_req->head[desc->next];
+	}
 
 	dlen = desc->len;
-	inhdr = GPA_TO_VVA(struct virtio_crypto_inhdr *, mem, desc->addr, &dlen);
-	if (unlikely(dlen != desc->len))
+	inhdr = IOVA_TO_VVA(struct virtio_crypto_inhdr *, vc_req, desc->addr,
+			&dlen, VHOST_ACCESS_WO);
+	if (unlikely(!inhdr || dlen != desc->len))
 		return NULL;
 
 	return inhdr;
@@ -492,64 +506,136 @@ reach_inhdr(struct vring_desc *head, struct rte_vhost_memory *mem,
 
 static __rte_always_inline int
 move_desc(struct vring_desc *head, struct vring_desc **cur_desc,
-		uint32_t size)
+		uint32_t size, uint32_t *nb_descs, uint32_t vq_size)
 {
 	struct vring_desc *desc = *cur_desc;
-	int left = size;
-
-	rte_prefetch0(&head[desc->next]);
-	left -= desc->len;
+	int left = size - desc->len;
 
 	while ((desc->flags & VRING_DESC_F_NEXT) && left > 0) {
+		(*nb_descs)--;
+		if (unlikely(*nb_descs == 0 || desc->next >= vq_size))
+			return -1;
+
 		desc = &head[desc->next];
 		rte_prefetch0(&head[desc->next]);
 		left -= desc->len;
 	}
 
-	if (unlikely(left > 0)) {
-		VC_LOG_ERR("Incorrect virtio descriptor");
+	if (unlikely(left > 0))
 		return -1;
+
+	if (unlikely(*nb_descs == 0))
+		*cur_desc = NULL;
+	else {
+		if (unlikely(desc->next >= vq_size))
+			return -1;
+		*cur_desc = &head[desc->next];
 	}
 
-	*cur_desc = &head[desc->next];
 	return 0;
 }
 
+static __rte_always_inline void *
+get_data_ptr(struct vhost_crypto_data_req *vc_req, struct vring_desc *cur_desc,
+		uint8_t perm)
+{
+	void *data;
+	uint64_t dlen = cur_desc->len;
+
+	data = IOVA_TO_VVA(void *, vc_req, cur_desc->addr, &dlen, perm);
+	if (unlikely(!data || dlen != cur_desc->len)) {
+		VC_LOG_ERR("Failed to map object");
+		return NULL;
+	}
+
+	return data;
+}
+
 static int
-copy_data(void *dst_data, struct vring_desc *head, struct rte_vhost_memory *mem,
-		struct vring_desc **cur_desc, uint32_t size)
+copy_data(void *dst_data, struct vhost_crypto_data_req *vc_req,
+		struct vring_desc **cur_desc, uint32_t size,
+		uint32_t *nb_descs, uint32_t vq_size)
 {
 	struct vring_desc *desc = *cur_desc;
+	uint64_t remain, addr, dlen, len;
 	uint32_t to_copy;
 	uint8_t *data = dst_data;
 	uint8_t *src;
 	int left = size;
-	uint64_t dlen;
 
-	rte_prefetch0(&head[desc->next]);
 	to_copy = RTE_MIN(desc->len, (uint32_t)left);
-	dlen = desc->len;
-	src = GPA_TO_VVA(uint8_t *, mem, desc->addr, &dlen);
-	if (unlikely(!src || dlen != desc->len)) {
-		VC_LOG_ERR("Failed to map descriptor");
+	dlen = to_copy;
+	src = IOVA_TO_VVA(uint8_t *, vc_req, desc->addr, &dlen,
+			VHOST_ACCESS_RO);
+	if (unlikely(!src || !dlen))
 		return -1;
+
+	rte_memcpy((uint8_t *)data, src, dlen);
+	data += dlen;
+
+	if (unlikely(dlen < to_copy)) {
+		remain = to_copy - dlen;
+		addr = desc->addr + dlen;
+
+		while (remain) {
+			len = remain;
+			src = IOVA_TO_VVA(uint8_t *, vc_req, addr, &len,
+					VHOST_ACCESS_RO);
+			if (unlikely(!src || !len)) {
+				VC_LOG_ERR("Failed to map descriptor");
+				return -1;
+			}
+
+			rte_memcpy(data, src, len);
+			addr += len;
+			remain -= len;
+			data += len;
+		}
 	}
 
-	rte_memcpy((uint8_t *)data, src, to_copy);
 	left -= to_copy;
 
 	while ((desc->flags & VRING_DESC_F_NEXT) && left > 0) {
-		desc = &head[desc->next];
-		rte_prefetch0(&head[desc->next]);
+		if (unlikely(*nb_descs == 0 || desc->next >= vq_size)) {
+			VC_LOG_ERR("Invalid descriptors");
+			return -1;
+		}
+		(*nb_descs)--;
+
+		desc = &vc_req->head[desc->next];
+		rte_prefetch0(&vc_req->head[desc->next]);
 		to_copy = RTE_MIN(desc->len, (uint32_t)left);
 		dlen = desc->len;
-		src = GPA_TO_VVA(uint8_t *, mem, desc->addr, &dlen);
-		if (unlikely(!src || dlen != desc->len)) {
+		src = IOVA_TO_VVA(uint8_t *, vc_req, desc->addr, &dlen,
+				VHOST_ACCESS_RO);
+		if (unlikely(!src || !dlen)) {
 			VC_LOG_ERR("Failed to map descriptor");
 			return -1;
 		}
 
-		rte_memcpy(data + size - left, src, to_copy);
+		rte_memcpy(data, src, dlen);
+		data += dlen;
+
+		if (unlikely(dlen < to_copy)) {
+			remain = to_copy - dlen;
+			addr = desc->addr + dlen;
+
+			while (remain) {
+				len = remain;
+				src = IOVA_TO_VVA(uint8_t *, vc_req, addr, &len,
+						VHOST_ACCESS_RO);
+				if (unlikely(!src || !len)) {
+					VC_LOG_ERR("Failed to map descriptor");
+					return -1;
+				}
+
+				rte_memcpy(data, src, len);
+				addr += len;
+				remain -= len;
+				data += len;
+			}
+		}
+
 		left -= to_copy;
 	}
 
@@ -558,96 +644,200 @@ copy_data(void *dst_data, struct vring_desc *head, struct rte_vhost_memory *mem,
 		return -1;
 	}
 
-	*cur_desc = &head[desc->next];
+	if (unlikely(*nb_descs == 0))
+		*cur_desc = NULL;
+	else {
+		if (unlikely(desc->next >= vq_size))
+			return -1;
+		*cur_desc = &vc_req->head[desc->next];
+	}
 
 	return 0;
 }
 
-static __rte_always_inline void *
-get_data_ptr(struct vring_desc *head, struct rte_vhost_memory *mem,
-		struct vring_desc **cur_desc, uint32_t size)
+static void
+write_back_data(struct vhost_crypto_data_req *vc_req)
 {
-	void *data;
-	uint64_t dlen = (*cur_desc)->len;
+	struct vhost_crypto_writeback_data *wb_data = vc_req->wb, *wb_last;
 
-	data = GPA_TO_VVA(void *, mem, (*cur_desc)->addr, &dlen);
-	if (unlikely(!data || dlen != (*cur_desc)->len)) {
-		VC_LOG_ERR("Failed to map object");
-		return NULL;
+	while (wb_data) {
+		rte_memcpy(wb_data->dst, wb_data->src, wb_data->len);
+		wb_last = wb_data;
+		wb_data = wb_data->next;
+		rte_mempool_put(vc_req->wb_pool, wb_last);
 	}
+}
 
-	if (unlikely(move_desc(head, cur_desc, size) < 0))
-		return NULL;
+static void
+free_wb_data(struct vhost_crypto_writeback_data *wb_data,
+		struct rte_mempool *mp)
+{
+	while (wb_data->next != NULL)
+		free_wb_data(wb_data->next, mp);
 
-	return data;
+	rte_mempool_put(mp, wb_data);
 }
 
-static int
-write_back_data(struct rte_crypto_op *op, struct vhost_crypto_data_req *vc_req)
+/**
+ * The function will allocate a vhost_crypto_writeback_data linked list
+ * containing the source and destination data pointers for the write back
+ * operation after dequeued from Cryptodev PMD queues.
+ *
+ * @param vc_req
+ *   The vhost crypto data request pointer
+ * @param cur_desc
+ *   The pointer of the current in use descriptor pointer. The content of
+ *   cur_desc is expected to be updated after the function execution.
+ * @param end_wb_data
+ *   The last write back data element to be returned. It is used only in cipher
+ *   and hash chain operations.
+ * @param src
+ *   The source data pointer
+ * @param offset
+ *   The offset to both source and destination data. For source data the offset
+ *   is the number of bytes between src and start point of cipher operation. For
+ *   destination data the offset is the number of bytes from *cur_desc->addr
+ *   to the point where the src will be written to.
+ * @param write_back_len
+ *   The size of the write back length.
+ * @return
+ *   The pointer to the start of the write back data linked list.
+ */
+static struct vhost_crypto_writeback_data *
+prepare_write_back_data(struct vhost_crypto_data_req *vc_req,
+		struct vring_desc **cur_desc,
+		struct vhost_crypto_writeback_data **end_wb_data,
+		uint8_t *src,
+		uint32_t offset,
+		uint64_t write_back_len,
+		uint32_t *nb_descs, uint32_t vq_size)
 {
-	struct rte_mbuf *mbuf = op->sym->m_dst;
-	struct vring_desc *head = vc_req->head;
-	struct rte_vhost_memory *mem = vc_req->mem;
-	struct vring_desc *desc = vc_req->wb_desc;
-	int left = vc_req->wb_len;
-	uint32_t to_write;
-	uint8_t *src_data = mbuf->buf_addr, *dst;
+	struct vhost_crypto_writeback_data *wb_data, *head;
+	struct vring_desc *desc = *cur_desc;
 	uint64_t dlen;
+	uint8_t *dst;
+	int ret;
 
-	rte_prefetch0(&head[desc->next]);
-	to_write = RTE_MIN(desc->len, (uint32_t)left);
-	dlen = desc->len;
-	dst = GPA_TO_VVA(uint8_t *, mem, desc->addr, &dlen);
-	if (unlikely(!dst || dlen != desc->len)) {
-		VC_LOG_ERR("Failed to map descriptor");
-		return -1;
+	ret = rte_mempool_get(vc_req->wb_pool, (void **)&head);
+	if (unlikely(ret < 0)) {
+		VC_LOG_ERR("no memory");
+		goto error_exit;
 	}
 
-	rte_memcpy(dst, src_data, to_write);
-	left -= to_write;
-	src_data += to_write;
+	wb_data = head;
 
-	while ((desc->flags & VRING_DESC_F_NEXT) && left > 0) {
-		desc = &head[desc->next];
-		rte_prefetch0(&head[desc->next]);
-		to_write = RTE_MIN(desc->len, (uint32_t)left);
+	if (likely(desc->len > offset)) {
+		wb_data->src = src + offset;
 		dlen = desc->len;
-		dst = GPA_TO_VVA(uint8_t *, mem, desc->addr, &dlen);
+		dst = IOVA_TO_VVA(uint8_t *, vc_req, desc->addr,
+			&dlen, VHOST_ACCESS_RW) + offset;
 		if (unlikely(!dst || dlen != desc->len)) {
 			VC_LOG_ERR("Failed to map descriptor");
-			return -1;
+			goto error_exit;
+		}
+
+		wb_data->dst = dst;
+		wb_data->len = desc->len - offset;
+		write_back_len -= wb_data->len;
+		src += offset + wb_data->len;
+		offset = 0;
+
+		if (unlikely(write_back_len)) {
+			ret = rte_mempool_get(vc_req->wb_pool,
+					(void **)&(wb_data->next));
+			if (unlikely(ret < 0)) {
+				VC_LOG_ERR("no memory");
+				goto error_exit;
+			}
+
+			wb_data = wb_data->next;
+		} else
+			wb_data->next = NULL;
+	} else
+		offset -= desc->len;
+
+	while (write_back_len) {
+		if (unlikely(*nb_descs == 0 || desc->next >= vq_size)) {
+			VC_LOG_ERR("Invalid descriptors");
+			goto error_exit;
 		}
+		(*nb_descs)--;
 
-		rte_memcpy(dst, src_data, to_write);
-		left -= to_write;
-		src_data += to_write;
+		desc = &vc_req->head[desc->next];
+		if (unlikely(!(desc->flags & VRING_DESC_F_WRITE))) {
+			VC_LOG_ERR("incorrect descriptor");
+			goto error_exit;
+		}
+
+		if (desc->len <= offset) {
+			offset -= desc->len;
+			continue;
+		}
+
+		dlen = desc->len;
+		dst = IOVA_TO_VVA(uint8_t *, vc_req, desc->addr, &dlen,
+				VHOST_ACCESS_RW) + offset;
+		if (unlikely(dst == NULL || dlen != desc->len)) {
+			VC_LOG_ERR("Failed to map descriptor");
+			goto error_exit;
+		}
+
+		wb_data->src = src;
+		wb_data->dst = dst;
+		wb_data->len = RTE_MIN(desc->len - offset, write_back_len);
+		write_back_len -= wb_data->len;
+		src += wb_data->len;
+		offset = 0;
+
+		if (write_back_len) {
+			ret = rte_mempool_get(vc_req->wb_pool,
+					(void **)&(wb_data->next));
+			if (unlikely(ret < 0)) {
+				VC_LOG_ERR("no memory");
+				goto error_exit;
+			}
+
+			wb_data = wb_data->next;
+		} else
+			wb_data->next = NULL;
 	}
 
-	if (unlikely(left < 0)) {
-		VC_LOG_ERR("Incorrect virtio descriptor");
-		return -1;
+	if (unlikely(*nb_descs == 0))
+		*cur_desc = NULL;
+	else {
+		if (unlikely(desc->next >= vq_size))
+			goto error_exit;
+		*cur_desc = &vc_req->head[desc->next];
 	}
 
-	return 0;
+	*end_wb_data = wb_data;
+
+	return head;
+
+error_exit:
+	if (head)
+		free_wb_data(head, vc_req->wb_pool);
+
+	return NULL;
 }
 
 static uint8_t
 prepare_sym_cipher_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 		struct vhost_crypto_data_req *vc_req,
 		struct virtio_crypto_cipher_data_req *cipher,
-		struct vring_desc *cur_desc)
+		struct vring_desc *cur_desc,
+		uint32_t *nb_descs, uint32_t vq_size)
 {
-	struct vring_desc *head = vc_req->head;
 	struct vring_desc *desc = cur_desc;
-	struct rte_vhost_memory *mem = vc_req->mem;
+	struct vhost_crypto_writeback_data *ewb = NULL;
 	struct rte_mbuf *m_src = op->sym->m_src, *m_dst = op->sym->m_dst;
 	uint8_t *iv_data = rte_crypto_op_ctod_offset(op, uint8_t *, IV_OFFSET);
 	uint8_t ret = 0;
 
 	/* prepare */
 	/* iv */
-	if (unlikely(copy_data(iv_data, head, mem, &desc,
-			cipher->para.iv_len) < 0)) {
+	if (unlikely(copy_data(iv_data, vc_req, &desc, cipher->para.iv_len,
+			nb_descs, vq_size) < 0)) {
 		ret = VIRTIO_CRYPTO_BADMSG;
 		goto error_exit;
 	}
@@ -658,25 +848,35 @@ prepare_sym_cipher_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 	case RTE_VHOST_CRYPTO_ZERO_COPY_ENABLE:
 		m_src->buf_iova = gpa_to_hpa(vcrypto->dev, desc->addr,
 				cipher->para.src_data_len);
-		m_src->buf_addr = get_data_ptr(head, mem, &desc,
-				cipher->para.src_data_len);
+		m_src->buf_addr = get_data_ptr(vc_req, desc, VHOST_ACCESS_RO);
 		if (unlikely(m_src->buf_iova == 0 ||
 				m_src->buf_addr == NULL)) {
 			VC_LOG_ERR("zero_copy may fail due to cross page data");
 			ret = VIRTIO_CRYPTO_ERR;
 			goto error_exit;
 		}
+
+		if (unlikely(move_desc(vc_req->head, &desc,
+				cipher->para.src_data_len, nb_descs,
+				vq_size) < 0)) {
+			VC_LOG_ERR("Incorrect descriptor");
+			ret = VIRTIO_CRYPTO_ERR;
+			goto error_exit;
+		}
+
 		break;
 	case RTE_VHOST_CRYPTO_ZERO_COPY_DISABLE:
+		vc_req->wb_pool = vcrypto->wb_pool;
+
 		if (unlikely(cipher->para.src_data_len >
 				RTE_MBUF_DEFAULT_BUF_SIZE)) {
 			VC_LOG_ERR("Not enough space to do data copy");
 			ret = VIRTIO_CRYPTO_ERR;
 			goto error_exit;
 		}
-		if (unlikely(copy_data(rte_pktmbuf_mtod(m_src, uint8_t *), head,
-				mem, &desc, cipher->para.src_data_len)
-				< 0)) {
+		if (unlikely(copy_data(rte_pktmbuf_mtod(m_src, uint8_t *),
+				vc_req, &desc, cipher->para.src_data_len,
+				nb_descs, vq_size) < 0)) {
 			ret = VIRTIO_CRYPTO_BADMSG;
 			goto error_exit;
 		}
@@ -687,7 +887,7 @@ prepare_sym_cipher_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 	}
 
 	/* dst */
-	desc = find_write_desc(head, desc);
+	desc = find_write_desc(vc_req->head, desc, nb_descs, vq_size);
 	if (unlikely(!desc)) {
 		VC_LOG_ERR("Cannot find write location");
 		ret = VIRTIO_CRYPTO_BADMSG;
@@ -698,23 +898,32 @@ prepare_sym_cipher_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 	case RTE_VHOST_CRYPTO_ZERO_COPY_ENABLE:
 		m_dst->buf_iova = gpa_to_hpa(vcrypto->dev,
 				desc->addr, cipher->para.dst_data_len);
-		m_dst->buf_addr = get_data_ptr(head, mem, &desc,
-				cipher->para.dst_data_len);
+		m_dst->buf_addr = get_data_ptr(vc_req, desc, VHOST_ACCESS_RW);
 		if (unlikely(m_dst->buf_iova == 0 || m_dst->buf_addr == NULL)) {
 			VC_LOG_ERR("zero_copy may fail due to cross page data");
 			ret = VIRTIO_CRYPTO_ERR;
 			goto error_exit;
 		}
 
+		if (unlikely(move_desc(vc_req->head, &desc,
+				cipher->para.dst_data_len,
+				nb_descs, vq_size) < 0)) {
+			VC_LOG_ERR("Incorrect descriptor");
+			ret = VIRTIO_CRYPTO_ERR;
+			goto error_exit;
+		}
+
 		m_dst->data_len = cipher->para.dst_data_len;
 		break;
 	case RTE_VHOST_CRYPTO_ZERO_COPY_DISABLE:
-		vc_req->wb_desc = desc;
-		vc_req->wb_len = cipher->para.dst_data_len;
-		if (unlikely(move_desc(head, &desc, vc_req->wb_len) < 0)) {
+		vc_req->wb = prepare_write_back_data(vc_req, &desc, &ewb,
+				rte_pktmbuf_mtod(m_src, uint8_t *), 0,
+				cipher->para.dst_data_len, nb_descs, vq_size);
+		if (unlikely(vc_req->wb == NULL)) {
 			ret = VIRTIO_CRYPTO_ERR;
 			goto error_exit;
 		}
+
 		break;
 	default:
 		ret = VIRTIO_CRYPTO_BADMSG;
@@ -728,7 +937,7 @@ prepare_sym_cipher_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 	op->sym->cipher.data.offset = 0;
 	op->sym->cipher.data.length = cipher->para.src_data_len;
 
-	vc_req->inhdr = get_data_ptr(head, mem, &desc, INHDR_LEN);
+	vc_req->inhdr = get_data_ptr(vc_req, desc, VHOST_ACCESS_WO);
 	if (unlikely(vc_req->inhdr == NULL)) {
 		ret = VIRTIO_CRYPTO_BADMSG;
 		goto error_exit;
@@ -740,6 +949,9 @@ prepare_sym_cipher_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 	return 0;
 
 error_exit:
+	if (vc_req->wb)
+		free_wb_data(vc_req->wb, vc_req->wb_pool);
+
 	vc_req->len = INHDR_LEN;
 	return ret;
 }
@@ -748,11 +960,11 @@ static uint8_t
 prepare_sym_chain_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 		struct vhost_crypto_data_req *vc_req,
 		struct virtio_crypto_alg_chain_data_req *chain,
-		struct vring_desc *cur_desc)
+		struct vring_desc *cur_desc,
+		uint32_t *nb_descs, uint32_t vq_size)
 {
-	struct vring_desc *head = vc_req->head;
-	struct vring_desc *desc = cur_desc;
-	struct rte_vhost_memory *mem = vc_req->mem;
+	struct vring_desc *desc = cur_desc, *digest_desc;
+	struct vhost_crypto_writeback_data *ewb = NULL, *ewb2 = NULL;
 	struct rte_mbuf *m_src = op->sym->m_src, *m_dst = op->sym->m_dst;
 	uint8_t *iv_data = rte_crypto_op_ctod_offset(op, uint8_t *, IV_OFFSET);
 	uint32_t digest_offset;
@@ -761,39 +973,51 @@ prepare_sym_chain_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 
 	/* prepare */
 	/* iv */
-	if (unlikely(copy_data(iv_data, head, mem, &desc,
-			chain->para.iv_len) < 0)) {
+	if (unlikely(copy_data(iv_data, vc_req, &desc,
+			chain->para.iv_len, nb_descs, vq_size) < 0)) {
 		ret = VIRTIO_CRYPTO_BADMSG;
 		goto error_exit;
 	}
 
 	m_src->data_len = chain->para.src_data_len;
-	m_dst->data_len = chain->para.dst_data_len;
 
 	switch (vcrypto->option) {
 	case RTE_VHOST_CRYPTO_ZERO_COPY_ENABLE:
+		m_dst->data_len = chain->para.dst_data_len;
+
 		m_src->buf_iova = gpa_to_hpa(vcrypto->dev, desc->addr,
 				chain->para.src_data_len);
-		m_src->buf_addr = get_data_ptr(head, mem, &desc,
-				chain->para.src_data_len);
+		m_src->buf_addr = get_data_ptr(vc_req, desc, VHOST_ACCESS_RO);
 		if (unlikely(m_src->buf_iova == 0 || m_src->buf_addr == NULL)) {
 			VC_LOG_ERR("zero_copy may fail due to cross page data");
 			ret = VIRTIO_CRYPTO_ERR;
 			goto error_exit;
 		}
+
+		if (unlikely(move_desc(vc_req->head, &desc,
+				chain->para.src_data_len,
+				nb_descs, vq_size) < 0)) {
+			VC_LOG_ERR("Incorrect descriptor");
+			ret = VIRTIO_CRYPTO_ERR;
+			goto error_exit;
+		}
 		break;
 	case RTE_VHOST_CRYPTO_ZERO_COPY_DISABLE:
+		vc_req->wb_pool = vcrypto->wb_pool;
+
 		if (unlikely(chain->para.src_data_len >
 				RTE_MBUF_DEFAULT_BUF_SIZE)) {
 			VC_LOG_ERR("Not enough space to do data copy");
 			ret = VIRTIO_CRYPTO_ERR;
 			goto error_exit;
 		}
-		if (unlikely(copy_data(rte_pktmbuf_mtod(m_src, uint8_t *), head,
-				mem, &desc, chain->para.src_data_len)) < 0) {
+		if (unlikely(copy_data(rte_pktmbuf_mtod(m_src, uint8_t *),
+				vc_req, &desc, chain->para.src_data_len,
+				nb_descs, vq_size) < 0)) {
 			ret = VIRTIO_CRYPTO_BADMSG;
 			goto error_exit;
 		}
+
 		break;
 	default:
 		ret = VIRTIO_CRYPTO_BADMSG;
@@ -801,7 +1025,7 @@ prepare_sym_chain_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 	}
 
 	/* dst */
-	desc = find_write_desc(head, desc);
+	desc = find_write_desc(vc_req->head, desc, nb_descs, vq_size);
 	if (unlikely(!desc)) {
 		VC_LOG_ERR("Cannot find write location");
 		ret = VIRTIO_CRYPTO_BADMSG;
@@ -812,46 +1036,75 @@ prepare_sym_chain_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 	case RTE_VHOST_CRYPTO_ZERO_COPY_ENABLE:
 		m_dst->buf_iova = gpa_to_hpa(vcrypto->dev,
 				desc->addr, chain->para.dst_data_len);
-		m_dst->buf_addr = get_data_ptr(head, mem, &desc,
-				chain->para.dst_data_len);
+		m_dst->buf_addr = get_data_ptr(vc_req, desc, VHOST_ACCESS_RW);
 		if (unlikely(m_dst->buf_iova == 0 || m_dst->buf_addr == NULL)) {
 			VC_LOG_ERR("zero_copy may fail due to cross page data");
 			ret = VIRTIO_CRYPTO_ERR;
 			goto error_exit;
 		}
 
+		if (unlikely(move_desc(vc_req->head, &desc,
+				chain->para.dst_data_len,
+				nb_descs, vq_size) < 0)) {
+			VC_LOG_ERR("Incorrect descriptor");
+			ret = VIRTIO_CRYPTO_ERR;
+			goto error_exit;
+		}
+
 		op->sym->auth.digest.phys_addr = gpa_to_hpa(vcrypto->dev,
 				desc->addr, chain->para.hash_result_len);
-		op->sym->auth.digest.data = get_data_ptr(head, mem, &desc,
-				chain->para.hash_result_len);
+		op->sym->auth.digest.data = get_data_ptr(vc_req, desc,
+				VHOST_ACCESS_RW);
 		if (unlikely(op->sym->auth.digest.phys_addr == 0)) {
 			VC_LOG_ERR("zero_copy may fail due to cross page data");
 			ret = VIRTIO_CRYPTO_ERR;
 			goto error_exit;
 		}
+
+		if (unlikely(move_desc(vc_req->head, &desc,
+				chain->para.hash_result_len,
+				nb_descs, vq_size) < 0)) {
+			VC_LOG_ERR("Incorrect descriptor");
+			ret = VIRTIO_CRYPTO_ERR;
+			goto error_exit;
+		}
+
 		break;
 	case RTE_VHOST_CRYPTO_ZERO_COPY_DISABLE:
-		digest_offset = m_dst->data_len;
-		digest_addr = rte_pktmbuf_mtod_offset(m_dst, void *,
-				digest_offset);
+		vc_req->wb = prepare_write_back_data(vc_req, &desc, &ewb,
+				rte_pktmbuf_mtod(m_src, uint8_t *),
+				chain->para.cipher_start_src_offset,
+				chain->para.dst_data_len -
+				chain->para.cipher_start_src_offset,
+				nb_descs, vq_size);
+		if (unlikely(vc_req->wb == NULL)) {
+			ret = VIRTIO_CRYPTO_ERR;
+			goto error_exit;
+		}
 
-		vc_req->wb_desc = desc;
-		vc_req->wb_len = m_dst->data_len + chain->para.hash_result_len;
+		digest_offset = m_src->data_len;
+		digest_addr = rte_pktmbuf_mtod_offset(m_src, void *,
+				digest_offset);
+		digest_desc = desc;
 
-		if (unlikely(move_desc(head, &desc,
-				chain->para.dst_data_len) < 0)) {
-			ret = VIRTIO_CRYPTO_BADMSG;
+		/** create a wb_data for digest */
+		ewb->next = prepare_write_back_data(vc_req, &desc, &ewb2,
+				digest_addr, 0, chain->para.hash_result_len,
+				nb_descs, vq_size);
+		if (unlikely(ewb->next == NULL)) {
+			ret = VIRTIO_CRYPTO_ERR;
 			goto error_exit;
 		}
 
-		if (unlikely(copy_data(digest_addr, head, mem, &desc,
-				chain->para.hash_result_len)) < 0) {
+		if (unlikely(copy_data(digest_addr, vc_req, &digest_desc,
+				chain->para.hash_result_len,
+				nb_descs, vq_size) < 0)) {
 			ret = VIRTIO_CRYPTO_BADMSG;
 			goto error_exit;
 		}
 
 		op->sym->auth.digest.data = digest_addr;
-		op->sym->auth.digest.phys_addr = rte_pktmbuf_iova_offset(m_dst,
+		op->sym->auth.digest.phys_addr = rte_pktmbuf_iova_offset(m_src,
 				digest_offset);
 		break;
 	default:
@@ -860,7 +1113,7 @@ prepare_sym_chain_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 	}
 
 	/* record inhdr */
-	vc_req->inhdr = get_data_ptr(head, mem, &desc, INHDR_LEN);
+	vc_req->inhdr = get_data_ptr(vc_req, desc, VHOST_ACCESS_WO);
 	if (unlikely(vc_req->inhdr == NULL)) {
 		ret = VIRTIO_CRYPTO_BADMSG;
 		goto error_exit;
@@ -883,6 +1136,8 @@ prepare_sym_chain_op(struct vhost_crypto *vcrypto, struct rte_crypto_op *op,
 	return 0;
 
 error_exit:
+	if (vc_req->wb)
+		free_wb_data(vc_req->wb, vc_req->wb_pool);
 	vc_req->len = INHDR_LEN;
 	return ret;
 }
@@ -893,24 +1148,30 @@ error_exit:
 static __rte_always_inline int
 vhost_crypto_process_one_req(struct vhost_crypto *vcrypto,
 		struct vhost_virtqueue *vq, struct rte_crypto_op *op,
-		struct vring_desc *head, uint16_t desc_idx,
-		struct rte_vhost_memory *mem)
+		struct vring_desc *head, uint16_t desc_idx)
 {
-	struct vhost_crypto_data_req *vc_req = RTE_PTR_ADD(op->sym->m_src,
-			sizeof(struct rte_mbuf));
+	struct vhost_crypto_data_req *vc_req = rte_mbuf_to_priv(op->sym->m_src);
 	struct rte_cryptodev_sym_session *session;
-	struct virtio_crypto_op_data_req *req;
+	struct virtio_crypto_op_data_req *req, tmp_req;
 	struct virtio_crypto_inhdr *inhdr;
 	struct vring_desc *desc = NULL;
 	uint64_t session_id;
 	uint64_t dlen;
+	uint32_t nb_descs = vq->size;
 	int err = 0;
 
 	vc_req->desc_idx = desc_idx;
+	vc_req->dev = vcrypto->dev;
+	vc_req->vq = vq;
 
 	if (likely(head->flags & VRING_DESC_F_INDIRECT)) {
 		dlen = head->len;
-		desc = GPA_TO_VVA(struct vring_desc *, mem, head->addr, &dlen);
+		nb_descs = dlen / sizeof(struct vring_desc);
+		/* drop invalid descriptors */
+		if (unlikely(nb_descs > vq->size))
+			return -1;
+		desc = IOVA_TO_VVA(struct vring_desc *, vc_req, head->addr,
+				&dlen, VHOST_ACCESS_RO);
 		if (unlikely(!desc || dlen != head->len))
 			return -1;
 		desc_idx = 0;
@@ -919,17 +1180,36 @@ vhost_crypto_process_one_req(struct vhost_crypto *vcrypto,
 		desc = head;
 	}
 
-	vc_req->mem = mem;
 	vc_req->head = head;
-	vc_req->vq = vq;
-
 	vc_req->zero_copy = vcrypto->option;
 
-	req = get_data_ptr(head, mem, &desc, sizeof(*req));
+	req = get_data_ptr(vc_req, desc, VHOST_ACCESS_RO);
 	if (unlikely(req == NULL)) {
-		err = VIRTIO_CRYPTO_ERR;
-		VC_LOG_ERR("Invalid descriptor");
-		goto error_exit;
+		switch (vcrypto->option) {
+		case RTE_VHOST_CRYPTO_ZERO_COPY_ENABLE:
+			err = VIRTIO_CRYPTO_BADMSG;
+			VC_LOG_ERR("Invalid descriptor");
+			goto error_exit;
+		case RTE_VHOST_CRYPTO_ZERO_COPY_DISABLE:
+			req = &tmp_req;
+			if (unlikely(copy_data(req, vc_req, &desc, sizeof(*req),
+					&nb_descs, vq->size) < 0)) {
+				err = VIRTIO_CRYPTO_BADMSG;
+				VC_LOG_ERR("Invalid descriptor");
+				goto error_exit;
+			}
+			break;
+		default:
+			err = VIRTIO_CRYPTO_ERR;
+			VC_LOG_ERR("Invalid option");
+			goto error_exit;
+		}
+	} else {
+		if (unlikely(move_desc(vc_req->head, &desc,
+				sizeof(*req), &nb_descs, vq->size) < 0)) {
+			VC_LOG_ERR("Incorrect descriptor");
+			goto error_exit;
+		}
 	}
 
 	switch (req->header.opcode) {
@@ -967,11 +1247,13 @@ vhost_crypto_process_one_req(struct vhost_crypto *vcrypto,
 			break;
 		case VIRTIO_CRYPTO_SYM_OP_CIPHER:
 			err = prepare_sym_cipher_op(vcrypto, op, vc_req,
-					&req->u.sym_req.u.cipher, desc);
+					&req->u.sym_req.u.cipher, desc,
+					&nb_descs, vq->size);
 			break;
 		case VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING:
 			err = prepare_sym_chain_op(vcrypto, op, vc_req,
-					&req->u.sym_req.u.chain, desc);
+					&req->u.sym_req.u.chain, desc,
+					&nb_descs, vq->size);
 			break;
 		}
 		if (unlikely(err != 0)) {
@@ -989,7 +1271,7 @@ vhost_crypto_process_one_req(struct vhost_crypto *vcrypto,
 
 error_exit:
 
-	inhdr = reach_inhdr(head, mem, desc);
+	inhdr = reach_inhdr(vc_req, desc, &nb_descs, vq->size);
 	if (likely(inhdr != NULL))
 		inhdr->status = (uint8_t)err;
 
@@ -1002,10 +1284,8 @@ vhost_crypto_finalize_one_request(struct rte_crypto_op *op,
 {
 	struct rte_mbuf *m_src = op->sym->m_src;
 	struct rte_mbuf *m_dst = op->sym->m_dst;
-	struct vhost_crypto_data_req *vc_req = RTE_PTR_ADD(m_src,
-			sizeof(struct rte_mbuf));
+	struct vhost_crypto_data_req *vc_req = rte_mbuf_to_priv(m_src);
 	uint16_t desc_idx;
-	int ret = 0;
 
 	if (unlikely(!vc_req)) {
 		VC_LOG_ERR("Failed to retrieve vc_req");
@@ -1020,19 +1300,18 @@ vhost_crypto_finalize_one_request(struct rte_crypto_op *op,
 	if (unlikely(op->status != RTE_CRYPTO_OP_STATUS_SUCCESS))
 		vc_req->inhdr->status = VIRTIO_CRYPTO_ERR;
 	else {
-		if (vc_req->zero_copy == 0) {
-			ret = write_back_data(op, vc_req);
-			if (unlikely(ret != 0))
-				vc_req->inhdr->status = VIRTIO_CRYPTO_ERR;
-		}
+		if (vc_req->zero_copy == 0)
+			write_back_data(vc_req);
 	}
 
 	vc_req->vq->used->ring[desc_idx].id = desc_idx;
 	vc_req->vq->used->ring[desc_idx].len = vc_req->len;
 
-	rte_mempool_put(m_dst->pool, (void *)m_dst);
 	rte_mempool_put(m_src->pool, (void *)m_src);
 
+	if (m_dst)
+		rte_mempool_put(m_dst->pool, (void *)m_dst);
+
 	return vc_req->vq;
 }
 
@@ -1068,9 +1347,11 @@ vhost_crypto_complete_one_vm_requests(struct rte_crypto_op **ops,
 	return processed;
 }
 
-int __rte_experimental
+int
 rte_vhost_crypto_create(int vid, uint8_t cryptodev_id,
-		struct rte_mempool *sess_pool, int socket_id)
+		struct rte_mempool *sess_pool,
+		struct rte_mempool *sess_priv_pool,
+		int socket_id)
 {
 	struct virtio_net *dev = get_device(vid);
 	struct rte_hash_parameters params = {0};
@@ -1098,6 +1379,7 @@ rte_vhost_crypto_create(int vid, uint8_t cryptodev_id,
 	}
 
 	vcrypto->sess_pool = sess_pool;
+	vcrypto->sess_priv_pool = sess_priv_pool;
 	vcrypto->cid = cryptodev_id;
 	vcrypto->cache_session_id = UINT64_MAX;
 	vcrypto->last_session_id = 1;
@@ -1129,6 +1411,18 @@ rte_vhost_crypto_create(int vid, uint8_t cryptodev_id,
 		goto error_exit;
 	}
 
+	snprintf(name, 127, "WB_POOL_VM_%u", (uint32_t)vid);
+	vcrypto->wb_pool = rte_mempool_create(name,
+			VHOST_CRYPTO_MBUF_POOL_SIZE,
+			sizeof(struct vhost_crypto_writeback_data),
+			128, 0, NULL, NULL, NULL, NULL,
+			rte_socket_id(), 0);
+	if (!vcrypto->wb_pool) {
+		VC_LOG_ERR("Failed to creath mempool");
+		ret = -ENOMEM;
+		goto error_exit;
+	}
+
 	dev->extern_data = vcrypto;
 	dev->extern_ops.pre_msg_handle = NULL;
 	dev->extern_ops.post_msg_handle = vhost_crypto_msg_post_handler;
@@ -1146,7 +1440,7 @@ error_exit:
 	return ret;
 }
 
-int __rte_experimental
+int
 rte_vhost_crypto_free(int vid)
 {
 	struct virtio_net *dev = get_device(vid);
@@ -1165,6 +1459,7 @@ rte_vhost_crypto_free(int vid)
 
 	rte_hash_free(vcrypto->session_map);
 	rte_mempool_free(vcrypto->mbuf_pool);
+	rte_mempool_free(vcrypto->wb_pool);
 	rte_free(vcrypto);
 
 	dev->extern_data = NULL;
@@ -1174,7 +1469,7 @@ rte_vhost_crypto_free(int vid)
 	return 0;
 }
 
-int __rte_experimental
+int
 rte_vhost_crypto_set_zero_copy(int vid, enum rte_vhost_crypto_zero_copy option)
 {
 	struct virtio_net *dev = get_device(vid);
@@ -1200,30 +1495,47 @@ rte_vhost_crypto_set_zero_copy(int vid, enum rte_vhost_crypto_zero_copy option)
 	if (vcrypto->option == (uint8_t)option)
 		return 0;
 
-	if (!(rte_mempool_full(vcrypto->mbuf_pool))) {
+	if (!(rte_mempool_full(vcrypto->mbuf_pool)) ||
+			!(rte_mempool_full(vcrypto->wb_pool))) {
 		VC_LOG_ERR("Cannot update zero copy as mempool is not full");
 		return -EINVAL;
 	}
 
+	if (option == RTE_VHOST_CRYPTO_ZERO_COPY_DISABLE) {
+		char name[128];
+
+		snprintf(name, 127, "WB_POOL_VM_%u", (uint32_t)vid);
+		vcrypto->wb_pool = rte_mempool_create(name,
+				VHOST_CRYPTO_MBUF_POOL_SIZE,
+				sizeof(struct vhost_crypto_writeback_data),
+				128, 0, NULL, NULL, NULL, NULL,
+				rte_socket_id(), 0);
+		if (!vcrypto->wb_pool) {
+			VC_LOG_ERR("Failed to creath mbuf pool");
+			return -ENOMEM;
+		}
+	} else {
+		rte_mempool_free(vcrypto->wb_pool);
+		vcrypto->wb_pool = NULL;
+	}
+
 	vcrypto->option = (uint8_t)option;
 
 	return 0;
 }
 
-uint16_t __rte_experimental
+uint16_t
 rte_vhost_crypto_fetch_requests(int vid, uint32_t qid,
 		struct rte_crypto_op **ops, uint16_t nb_ops)
 {
 	struct rte_mbuf *mbufs[VHOST_CRYPTO_MAX_BURST_SIZE * 2];
 	struct virtio_net *dev = get_device(vid);
-	struct rte_vhost_memory *mem;
 	struct vhost_crypto *vcrypto;
 	struct vhost_virtqueue *vq;
 	uint16_t avail_idx;
 	uint16_t start_idx;
-	uint16_t required;
 	uint16_t count;
-	uint16_t i;
+	uint16_t i = 0;
 
 	if (unlikely(dev == NULL)) {
 		VC_LOG_ERR("Invalid vid %i", vid);
@@ -1242,7 +1554,6 @@ rte_vhost_crypto_fetch_requests(int vid, uint32_t qid,
 	}
 
 	vq = dev->virtqueue[qid];
-	mem = dev->mem;
 
 	avail_idx = *((volatile uint16_t *)&vq->avail->idx);
 	start_idx = vq->last_used_idx;
@@ -1256,27 +1567,66 @@ rte_vhost_crypto_fetch_requests(int vid, uint32_t qid,
 	/* for zero copy, we need 2 empty mbufs for src and dst, otherwise
 	 * we need only 1 mbuf as src and dst
 	 */
-	required = count * 2;
-	if (unlikely(rte_mempool_get_bulk(vcrypto->mbuf_pool, (void **)mbufs,
-			required) < 0)) {
-		VC_LOG_ERR("Insufficient memory");
-		return -ENOMEM;
-	}
+	switch (vcrypto->option) {
+	case RTE_VHOST_CRYPTO_ZERO_COPY_ENABLE:
+		if (unlikely(rte_mempool_get_bulk(vcrypto->mbuf_pool,
+				(void **)mbufs, count * 2) < 0)) {
+			VC_LOG_ERR("Insufficient memory");
+			return -ENOMEM;
+		}
 
-	for (i = 0; i < count; i++) {
-		uint16_t used_idx = (start_idx + i) & (vq->size - 1);
-		uint16_t desc_idx = vq->avail->ring[used_idx];
-		struct vring_desc *head = &vq->desc[desc_idx];
-		struct rte_crypto_op *op = ops[i];
+		for (i = 0; i < count; i++) {
+			uint16_t used_idx = (start_idx + i) & (vq->size - 1);
+			uint16_t desc_idx = vq->avail->ring[used_idx];
+			struct vring_desc *head = &vq->desc[desc_idx];
+			struct rte_crypto_op *op = ops[i];
 
-		op->sym->m_src = mbufs[i * 2];
-		op->sym->m_dst = mbufs[i * 2 + 1];
-		op->sym->m_src->data_off = 0;
-		op->sym->m_dst->data_off = 0;
+			op->sym->m_src = mbufs[i * 2];
+			op->sym->m_dst = mbufs[i * 2 + 1];
+			op->sym->m_src->data_off = 0;
+			op->sym->m_dst->data_off = 0;
+
+			if (unlikely(vhost_crypto_process_one_req(vcrypto, vq,
+					op, head, desc_idx) < 0))
+				break;
+		}
+
+		if (unlikely(i < count))
+			rte_mempool_put_bulk(vcrypto->mbuf_pool,
+					(void **)&mbufs[i * 2],
+					(count - i) * 2);
+
+		break;
+
+	case RTE_VHOST_CRYPTO_ZERO_COPY_DISABLE:
+		if (unlikely(rte_mempool_get_bulk(vcrypto->mbuf_pool,
+				(void **)mbufs, count) < 0)) {
+			VC_LOG_ERR("Insufficient memory");
+			return -ENOMEM;
+		}
+
+		for (i = 0; i < count; i++) {
+			uint16_t used_idx = (start_idx + i) & (vq->size - 1);
+			uint16_t desc_idx = vq->avail->ring[used_idx];
+			struct vring_desc *head = &vq->desc[desc_idx];
+			struct rte_crypto_op *op = ops[i];
+
+			op->sym->m_src = mbufs[i];
+			op->sym->m_dst = NULL;
+			op->sym->m_src->data_off = 0;
+
+			if (unlikely(vhost_crypto_process_one_req(vcrypto, vq,
+					op, head, desc_idx) < 0))
+				break;
+		}
+
+		if (unlikely(i < count))
+			rte_mempool_put_bulk(vcrypto->mbuf_pool,
+					(void **)&mbufs[i],
+					count - i);
+
+		break;
 
-		if (unlikely(vhost_crypto_process_one_req(vcrypto, vq, op, head,
-				desc_idx, mem)) < 0)
-			break;
 	}
 
 	vq->last_used_idx += i;
@@ -1284,7 +1634,7 @@ rte_vhost_crypto_fetch_requests(int vid, uint32_t qid,
 	return i;
 }
 
-uint16_t __rte_experimental
+uint16_t
 rte_vhost_crypto_finalize_requests(struct rte_crypto_op **ops,
 		uint16_t nb_ops, int *callfds, uint16_t *nb_callfds)
 {