libsrp.h

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#ifndef __LIBSRP_H__
#define __LIBSRP_H__

#include <linux/list.h>
#include <linux/kfifo.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