include/scsi/libsrp.h

   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
   9 enum iue_flags {
  10         V_DIOVER,
  11         V_WRITE,
  12         V_LINKED,
  13         V_FLYING,
  14 };
  15
  16 struct srp_buf {
  17         dma_addr_t dma;
  18         void *buf;
  19 };
  20
  21 struct srp_queue {
  22         void *pool;
  23         void *items;
  24         struct kfifo *queue;
  25         spinlock_t lock;
  26 };
  27
  28 struct 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
  43 struct 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
  53 typedef int (srp_rdma_t)(struct scsi_cmnd *, struct scatterlist *, int,
  54                          struct srp_direct_buf *, int,
  55                          enum dma_data_direction, unsigned int);
  56 extern int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
  57 extern void srp_target_free(struct srp_target *);
  58
  59 extern struct iu_entry *srp_iu_get(struct srp_target *);
  60 extern void srp_iu_put(struct iu_entry *);
  61
  62 extern int srp_cmd_queue(struct Scsi_Host *, struct srp_cmd *, void *, u64);
  63 extern int srp_transfer_data(struct scsi_cmnd *, struct srp_cmd *,
  64                              srp_rdma_t, int, int);
  65
  66
  67 static inline struct srp_target *host_to_srp_target(struct Scsi_Host *host)
  68 {
  69         return (struct srp_target *) host->hostdata;
  70 }
  71
  72 static 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