root/include/scsi/libsrp.h

DEFINITIONS

1. host_to_srp_target
2. srp_cmd_direction

#ifndef __LIBSRP_H__
#define __LIBSRP_H__

#include <linux/list.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <scsi/srp.h>

enum iue_flags {
        V_DIOVER,
        V_WRITE,
        V_LINKED,
        V_FLYING,
};

struct srp_buf {
        dma_addr_t dma;
        void *buf;
};

struct srp_queue {
        void *pool;
        void *items;
        struct kfifo *queue;
        spinlock_t lock;
};

struct srp_target {
        struct Scsi_Host *shost;
        struct device *dev;

        spinlock_t lock;
        struct list_head cmd_queue;

        size_t srp_iu_size;
        struct srp_queue iu_queue;
        size_t rx_ring_size;
        struct srp_buf **rx_ring;

        void *ldata;
};

struct iu_entry {
        struct srp_target *target;

        struct list_head ilist;
        dma_addr_t remote_token;
        unsigned long flags;

        struct srp_buf *sbuf;
};

typedef int (srp_rdma_t)(struct scsi_cmnd *, struct scatterlist *, int,
                         struct srp_direct_buf *, int,
                         enum dma_data_direction, unsigned int);
extern int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
extern void srp_target_free(struct srp_target *);

extern struct iu_entry *srp_iu_get(struct srp_target *);
extern void srp_iu_put(struct iu_entry *);

extern int srp_cmd_queue(struct Scsi_Host *, struct srp_cmd *, void *, u64, u64);
extern int srp_transfer_data(struct scsi_cmnd *, struct srp_cmd *,
                             srp_rdma_t, int, int);


static inline struct srp_target *host_to_srp_target(struct Scsi_Host *host)
{
        return (struct srp_target *) host->hostdata;
}

static inline int srp_cmd_direction(struct srp_cmd *cmd)
{
        return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
}

#endif