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