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Tip revision: a798c10faf62a505d24e5f6213fbaf904a39623f authored by Linus Torvalds on 20 April 2014, 18:08:50 UTC
Linux 3.15-rc2
Linux 3.15-rc2
Tip revision: a798c10
libsrp.h
#ifndef __LIBSRP_H__
#define __LIBSRP_H__
#include <linux/list.h>
#include <linux/kfifo.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <scsi/srp.h>
enum iue_flags {
V_DIOVER,
V_WRITE,
V_LINKED,
V_FLYING,
};
struct srp_buf {
dma_addr_t dma;
void *buf;
};
struct srp_queue {
void *pool;
void *items;
struct kfifo queue;
spinlock_t lock;
};
struct srp_target {
struct Scsi_Host *shost;
struct device *dev;
spinlock_t lock;
struct list_head cmd_queue;
size_t srp_iu_size;
struct srp_queue iu_queue;
size_t rx_ring_size;
struct srp_buf **rx_ring;
void *ldata;
};
struct iu_entry {
struct srp_target *target;
struct list_head ilist;
dma_addr_t remote_token;
unsigned long flags;
struct srp_buf *sbuf;
};
typedef int (srp_rdma_t)(struct scsi_cmnd *, struct scatterlist *, int,
struct srp_direct_buf *, int,
enum dma_data_direction, unsigned int);
extern int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
extern void srp_target_free(struct srp_target *);
extern struct iu_entry *srp_iu_get(struct srp_target *);
extern void srp_iu_put(struct iu_entry *);
extern int srp_cmd_queue(struct Scsi_Host *, struct srp_cmd *, void *, u64, u64);
extern int srp_transfer_data(struct scsi_cmnd *, struct srp_cmd *,
srp_rdma_t, int, int);
static inline struct srp_target *host_to_srp_target(struct Scsi_Host *host)
{
return (struct srp_target *) host->hostdata;
}
static inline int srp_cmd_direction(struct srp_cmd *cmd)
{
return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
}
#endif