include/scsi/libsrp.h

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