drivers/scsi/ibmvscsi_tgt/libsrp.h

   1 #ifndef __LIBSRP_H__
   2 #define __LIBSRP_H__
   3
   4 #include <linux/list.h>
   5 #include <linux/kfifo.h>
   6 #include <scsi/srp.h>
   7
   8 enum srp_valid {
   9         INVALIDATE_CMD_RESP_EL = 0,
  10         VALID_CMD_RESP_EL = 0x80,
  11         VALID_INIT_MSG = 0xC0,
  12         VALID_TRANS_EVENT = 0xFF
  13 };
  14
  15 enum srp_format {
  16         SRP_FORMAT = 1,
  17         MAD_FORMAT = 2,
  18         OS400_FORMAT = 3,
  19         AIX_FORMAT = 4,
  20         LINUX_FORMAT = 5,
  21         MESSAGE_IN_CRQ = 6
  22 };
  23
  24 enum srp_init_msg {
  25         INIT_MSG = 1,
  26         INIT_COMPLETE_MSG = 2
  27 };
  28
  29 enum srp_trans_event {
  30         UNUSED_FORMAT = 0,
  31         PARTNER_FAILED = 1,
  32         PARTNER_DEREGISTER = 2,
  33         MIGRATED = 6
  34 };
  35
  36 enum srp_status {
  37         HEADER_DESCRIPTOR = 0xF1,
  38         PING = 0xF5,
  39         PING_RESPONSE = 0xF6
  40 };
  41
  42 enum srp_mad_version {
  43         MAD_VERSION_1 = 1
  44 };
  45
  46 enum srp_os_type {
  47         OS400 = 1,
  48         LINUX = 2,
  49         AIX = 3,
  50         OFW = 4
  51 };
  52
  53 enum srp_task_attributes {
  54         SRP_SIMPLE_TASK = 0,
  55         SRP_HEAD_TASK = 1,
  56         SRP_ORDERED_TASK = 2,
  57         SRP_ACA_TASK = 4
  58 };
  59
  60 enum {
  61         SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE           = 0,
  62         SRP_REQUEST_FIELDS_INVALID                      = 2,
  63         SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED      = 4,
  64         SRP_TASK_MANAGEMENT_FUNCTION_FAILED             = 5
  65 };
  66
  67 struct srp_buf {
  68         dma_addr_t dma;
  69         void *buf;
  70 };
  71
  72 struct srp_queue {
  73         void *pool;
  74         void *items;
  75         struct kfifo queue;
  76         spinlock_t lock;
  77 };
  78
  79 struct srp_target {
  80         struct device *dev;
  81
  82         spinlock_t lock;
  83         struct list_head cmd_queue;
  84
  85         size_t srp_iu_size;
  86         struct srp_queue iu_queue;
  87         size_t rx_ring_size;
  88         struct srp_buf **rx_ring;
  89
  90         void *ldata;
  91 };
  92
  93 struct iu_entry {
  94         struct srp_target *target;
  95
  96         struct list_head ilist;
  97         dma_addr_t remote_token;
  98         unsigned long flags;
  99
 100         struct srp_buf *sbuf;
 101         u16 iu_len;
 102 };
 103
 104 struct ibmvscsis_cmd;
 105
 106 typedef int (srp_rdma_t)(struct ibmvscsis_cmd *, struct scatterlist *, int,
 107                          struct srp_direct_buf *, int,
 108                          enum dma_data_direction, unsigned int);
 109 int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
 110 void srp_target_free(struct srp_target *);
 111 struct iu_entry *srp_iu_get(struct srp_target *);
 112 void srp_iu_put(struct iu_entry *);
 113 int srp_transfer_data(struct ibmvscsis_cmd *, struct srp_cmd *,
 114                       srp_rdma_t, int, int);
 115 u64 srp_data_length(struct srp_cmd *cmd, enum dma_data_direction dir);
 116 int srp_get_desc_table(struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
 117                        u64 *data_len);
 118 static inline int srp_cmd_direction(struct srp_cmd *cmd)
 119 {
 120         return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
 121 }
 122
 123 #endif