linux/include/scsi/libsrp.h
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   1#ifndef __LIBSRP_H__
   2#define __LIBSRP_H__
   3
   4#include <linux/list.h>
   5#include <linux/kfifo.h>
   6#include <scsi/scsi_cmnd.h>
   7#include <scsi/scsi_host.h>
   8#include <scsi/srp.h>
   9
  10enum iue_flags {
  11        V_DIOVER,
  12        V_WRITE,
  13        V_LINKED,
  14        V_FLYING,
  15};
  16
  17struct srp_buf {
  18        dma_addr_t dma;
  19        void *buf;
  20};
  21
  22struct srp_queue {
  23        void *pool;
  24        void *items;
  25        struct kfifo queue;
  26        spinlock_t lock;
  27};
  28
  29struct srp_target {
  30        struct Scsi_Host *shost;
  31        struct device *dev;
  32
  33        spinlock_t lock;
  34        struct list_head cmd_queue;
  35
  36        size_t srp_iu_size;
  37        struct srp_queue iu_queue;
  38        size_t rx_ring_size;
  39        struct srp_buf **rx_ring;
  40
  41        void *ldata;
  42};
  43
  44struct iu_entry {
  45        struct srp_target *target;
  46
  47        struct list_head ilist;
  48        dma_addr_t remote_token;
  49        unsigned long flags;
  50
  51        struct srp_buf *sbuf;
  52};
  53
  54typedef int (srp_rdma_t)(struct scsi_cmnd *, struct scatterlist *, int,
  55                         struct srp_direct_buf *, int,
  56                         enum dma_data_direction, unsigned int);
  57extern int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
  58extern void srp_target_free(struct srp_target *);
  59
  60extern struct iu_entry *srp_iu_get(struct srp_target *);
  61extern void srp_iu_put(struct iu_entry *);
  62
  63extern int srp_cmd_queue(struct Scsi_Host *, struct srp_cmd *, void *, u64, u64);
  64extern int srp_transfer_data(struct scsi_cmnd *, struct srp_cmd *,
  65                             srp_rdma_t, int, int);
  66
  67
  68static inline struct srp_target *host_to_srp_target(struct Scsi_Host *host)
  69{
  70        return (struct srp_target *) host->hostdata;
  71}
  72
  73static inline int srp_cmd_direction(struct srp_cmd *cmd)
  74{
  75        return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
  76}
  77
  78#endif
  79
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