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    Subject[PATCH v16 12/17] Add header file for mp device.
    Date
    From: Xin Xiaohui <xiaohui.xin@intel.com>

    Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>
    Signed-off-by: Zhao Yu <yzhao81new@gmail.com>
    Reviewed-by: Jeff Dike <jdike@linux.intel.com>
    ---
    include/linux/mpassthru.h | 133 +++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 133 insertions(+), 0 deletions(-)
    create mode 100644 include/linux/mpassthru.h

    diff --git a/include/linux/mpassthru.h b/include/linux/mpassthru.h
    new file mode 100644
    index 0000000..1115f55
    --- /dev/null
    +++ b/include/linux/mpassthru.h
    @@ -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 */
    --
    1.7.3


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