new file mode 100644
@@ -0,0 +1,133 @@
+#ifndef __MPASSTHRU_H
+#define __MPASSTHRU_H
+
+#include <linux/types.h>
+#include <linux/if_ether.h>
+#include <linux/ioctl.h>
+
+/* ioctl defines */
+#define MPASSTHRU_BINDDEV _IOW('M', 213, int)
+#define MPASSTHRU_UNBINDDEV _IO('M', 214)
+#define MPASSTHRU_SET_MEM_LOCKED _IOW('M', 215, unsigned long)
+#define MPASSTHRU_GET_MEM_LOCKED_NEED _IOR('M', 216, unsigned long)
+
+#define COPY_THRESHOLD (L1_CACHE_BYTES * 4)
+#define COPY_HDR_LEN (L1_CACHE_BYTES < 64 ? 64 : L1_CACHE_BYTES)
+
+#define DEFAULT_NEED ((8192*2*2)*4096)
+
+struct frag {
+ u16 offset;
+ u16 size;
+};
+
+#define HASH_BUCKETS (8192*2)
+struct page_info {
+ struct list_head list;
+ struct page_info *next;
+ struct page_info *prev;
+ struct page *pages[MAX_SKB_FRAGS];
+ struct sk_buff *skb;
+ struct page_pool *pool;
+
+ /* The pointer relayed to skb, to indicate
+ * it's a external allocated skb or kernel
+ */
+ struct skb_ext_page ext_page;
+ /* flag to indicate read or write */
+#define INFO_READ 0
+#define INFO_WRITE 1
+ unsigned flags;
+ /* exact number of locked pages */
+ unsigned pnum;
+
+ /* The fields after that is for backend
+ * driver, now for vhost-net.
+ */
+ /* the kiocb structure related to */
+ struct kiocb *iocb;
+ /* the ring descriptor index */
+ unsigned int desc_pos;
+ /* the iovec coming from backend, we only
+ * need few of them */
+ struct iovec hdr[2];
+ struct iovec iov[2];
+};
+
+struct page_pool {
+ /* the queue for rx side */
+ struct list_head readq;
+ /* the lock to protect readq */
+ spinlock_t read_lock;
+ /* record the orignal rlimit */
+ struct rlimit o_rlim;
+ /* userspace wants to locked */
+ int locked_pages;
+ /* currently locked pages */
+ int cur_pages;
+ /* the memory locked before */
+ unsigned long orig_locked_vm;
+ /* the device according to */
+ struct net_device *dev;
+ /* the mp_port according to dev */
+ struct mp_port port;
+ /* the hash_table list to find each locked page */
+ struct page_info **hash_table;
+};
+
+static struct kmem_cache *ext_page_info_cache;
+
+#ifdef __KERNEL__
+#if defined(CONFIG_MEDIATE_PASSTHRU) || defined(CONFIG_MEDIATE_PASSTHRU_MODULE)
+struct socket *mp_get_socket(struct file *);
+struct page_pool *page_pool_create(struct net_device *dev,
+ struct socket *sock);
+int async_recvmsg(struct kiocb *iocb, struct page_pool *pool,
+ struct iovec *iov, int count, int flags);
+int async_sendmsg(struct sock *sk, struct kiocb *iocb,
+ struct page_pool *pool, struct iovec *iov,
+ int count);
+void async_data_ready(struct sock *sk, struct page_pool *pool);
+void dev_change_state(struct net_device *dev);
+void page_pool_destroy(struct mm_struct *mm, struct page_pool *pool);
+#else
+#include <linux/err.h>
+#include <linux/errno.h>
+struct file;
+struct socket;
+static inline struct socket *mp_get_socket(struct file *f)
+{
+ return ERR_PTR(-EINVAL);
+}
+static inline struct page_pool *page_pool_create(struct net_device *dev,
+ struct socket *sock)
+{
+ return ERR_PTR(-EINVAL);
+}
+static inline int async_recvmsg(struct kiocb *iocb, struct page_pool *pool,
+ struct iovec *iov, int count, int flags)
+{
+ return -EINVAL;
+}
+static inline int async_sendmsg(struct sock *sk, struct kiocb *iocb,
+ struct page_pool *pool, struct iovec *iov,
+ int count)
+{
+ return -EINVAL;
+}
+static inline void async_data_ready(struct sock *sk, struct page_pool *pool)
+{
+ return;
+}
+static inline void dev_change_state(struct net_device *dev)
+{
+ return;
+}
+static inline void page_pool_destroy(struct mm_struct *mm,
+ struct page_pool *pool)
+{
+ return;
+}
+#endif /* CONFIG_MEDIATE_PASSTHRU */
+#endif /* __KERNEL__ */
+#endif /* __MPASSTHRU_H */