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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2006-11-30 21:00:50 +0300
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-12-03 18:27:33 +0300
commit26b14823441382264e6f3dfd01b8687dc18196fe (patch)
treec965c5b5967f4485f433cf80db91d3d371d9cc8c /include/scsi/libsrp.h
parentc603d04ef6826a29f50cb151cb992f256d0cf19d (diff)
downloadlinux-26b14823441382264e6f3dfd01b8687dc18196fe.tar.xz
[SCSI] scsi tgt: SCSI RDMA Protocol library functions
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>
Diffstat (limited to 'include/scsi/libsrp.h')
-rw-r--r--include/scsi/libsrp.h77
1 files changed, 77 insertions, 0 deletions
diff --git a/include/scsi/libsrp.h b/include/scsi/libsrp.h
new file mode 100644
index 000000000000..d143171896ae
--- /dev/null
+++ b/include/scsi/libsrp.h
@@ -0,0 +1,77 @@
+#ifndef __LIBSRP_H__
+#define __LIBSRP_H__
+
+#include <linux/list.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);
+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