Root/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
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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