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26b1482344
libsrp provides helper functions for SRP target drivers. Some SRP target drivers would be out of drivers/scsi/ so we added an entry for libsrp in drivers/scsi/Kconfig. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Santiago Leon <santil@us.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
77 lines
1.5 KiB
C
77 lines
1.5 KiB
C
#ifndef __LIBSRP_H__
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#define __LIBSRP_H__
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#include <linux/list.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
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#include <scsi/srp.h>
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enum iue_flags {
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V_DIOVER,
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V_WRITE,
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V_LINKED,
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V_FLYING,
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};
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struct srp_buf {
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dma_addr_t dma;
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void *buf;
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};
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struct srp_queue {
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void *pool;
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void *items;
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struct kfifo *queue;
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spinlock_t lock;
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};
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struct srp_target {
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struct Scsi_Host *shost;
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struct device *dev;
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spinlock_t lock;
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struct list_head cmd_queue;
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size_t srp_iu_size;
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struct srp_queue iu_queue;
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size_t rx_ring_size;
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struct srp_buf **rx_ring;
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void *ldata;
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};
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struct iu_entry {
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struct srp_target *target;
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struct list_head ilist;
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dma_addr_t remote_token;
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unsigned long flags;
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struct srp_buf *sbuf;
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};
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typedef int (srp_rdma_t)(struct scsi_cmnd *, struct scatterlist *, int,
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struct srp_direct_buf *, int,
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enum dma_data_direction, unsigned int);
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extern int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
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extern void srp_target_free(struct srp_target *);
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extern struct iu_entry *srp_iu_get(struct srp_target *);
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extern void srp_iu_put(struct iu_entry *);
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extern int srp_cmd_queue(struct Scsi_Host *, struct srp_cmd *, void *, u64);
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extern int srp_transfer_data(struct scsi_cmnd *, struct srp_cmd *,
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srp_rdma_t, int, int);
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static inline struct srp_target *host_to_srp_target(struct Scsi_Host *host)
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{
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return (struct srp_target *) host->hostdata;
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}
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static inline int srp_cmd_direction(struct srp_cmd *cmd)
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{
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return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
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}
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#endif
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