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
host_to_srp_target(struct Scsi_Host * host)68 static inline struct srp_target *host_to_srp_target(struct Scsi_Host *host)
69 {
70 return (struct srp_target *) host->hostdata;
71 }
72
srp_cmd_direction(struct srp_cmd * cmd)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
79