drivers/target/target_core_rd.h

   1 #ifndef TARGET_CORE_RD_H
   2 #define TARGET_CORE_RD_H
   3
   4 #define RD_HBA_VERSION          "v4.0"
   5 #define RD_DR_VERSION           "4.0"
   6 #define RD_MCP_VERSION          "4.0"
   7
   8 /* Largest piece of memory kmalloc can allocate */
   9 #define RD_MAX_ALLOCATION_SIZE  65536
  10 /* Maximum queuedepth for the Ramdisk HBA */
  11 #define RD_HBA_QUEUE_DEPTH      256
  12 #define RD_DEVICE_QUEUE_DEPTH   32
  13 #define RD_MAX_DEVICE_QUEUE_DEPTH 128
  14 #define RD_BLOCKSIZE            512
  15 #define RD_MAX_SECTORS          1024
  16
  17 extern struct kmem_cache *se_mem_cache;
  18
  19 /* Used in target_core_init_configfs() for virtual LUN 0 access */
  20 int __init rd_module_init(void);
  21 void rd_module_exit(void);
  22
  23 #define RRF_EMULATE_CDB         0x01
  24 #define RRF_GOT_LBA             0x02
  25
  26 struct rd_request {
  27         struct se_task  rd_task;
  28
  29         /* SCSI CDB from iSCSI Command PDU */
  30         unsigned char   rd_scsi_cdb[TCM_MAX_COMMAND_SIZE];
  31         /* Offset from start of page */
  32         u32             rd_offset;
  33         /* Starting page in Ramdisk for request */
  34         u32             rd_page;
  35         /* Total number of pages needed for request */
  36         u32             rd_page_count;
  37         /* Scatterlist count */
  38         u32             rd_size;
  39         /* Ramdisk device */
  40         struct rd_dev   *rd_dev;
  41 } ____cacheline_aligned;
  42
  43 struct rd_dev_sg_table {
  44         u32             page_start_offset;
  45         u32             page_end_offset;
  46         u32             rd_sg_count;
  47         struct scatterlist *sg_table;
  48 } ____cacheline_aligned;
  49
  50 #define RDF_HAS_PAGE_COUNT      0x01
  51
  52 struct rd_dev {
  53         int             rd_direct;
  54         u32             rd_flags;
  55         /* Unique Ramdisk Device ID in Ramdisk HBA */
  56         u32             rd_dev_id;
  57         /* Total page count for ramdisk device */
  58         u32             rd_page_count;
  59         /* Number of SG tables in sg_table_array */
  60         u32             sg_table_count;
  61         u32             rd_queue_depth;
  62         /* Array of rd_dev_sg_table_t containing scatterlists */
  63         struct rd_dev_sg_table *sg_table_array;
  64         /* Ramdisk HBA device is connected to */
  65         struct rd_host *rd_host;
  66 } ____cacheline_aligned;
  67
  68 struct rd_host {
  69         u32             rd_host_dev_id_count;
  70         u32             rd_host_id;             /* Unique Ramdisk Host ID */
  71 } ____cacheline_aligned;
  72
  73 #endif /* TARGET_CORE_RD_H */