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 /* Used in target_core_init_configfs() for virtual LUN 0 access */
  18 int __init rd_module_init(void);
  19 void rd_module_exit(void);
  20
  21 #define RRF_EMULATE_CDB         0x01
  22 #define RRF_GOT_LBA             0x02
  23
  24 struct rd_request {
  25         struct se_task  rd_task;
  26
  27         /* SCSI CDB from iSCSI Command PDU */
  28         unsigned char   rd_scsi_cdb[TCM_MAX_COMMAND_SIZE];
  29         /* Offset from start of page */
  30         u32             rd_offset;
  31         /* Starting page in Ramdisk for request */
  32         u32             rd_page;
  33         /* Total number of pages needed for request */
  34         u32             rd_page_count;
  35         /* Scatterlist count */
  36         u32             rd_size;
  37         /* Ramdisk device */
  38         struct rd_dev   *rd_dev;
  39 } ____cacheline_aligned;
  40
  41 struct rd_dev_sg_table {
  42         u32             page_start_offset;
  43         u32             page_end_offset;
  44         u32             rd_sg_count;
  45         struct scatterlist *sg_table;
  46 } ____cacheline_aligned;
  47
  48 #define RDF_HAS_PAGE_COUNT      0x01
  49
  50 struct rd_dev {
  51         int             rd_direct;
  52         u32             rd_flags;
  53         /* Unique Ramdisk Device ID in Ramdisk HBA */
  54         u32             rd_dev_id;
  55         /* Total page count for ramdisk device */
  56         u32             rd_page_count;
  57         /* Number of SG tables in sg_table_array */
  58         u32             sg_table_count;
  59         u32             rd_queue_depth;
  60         /* Array of rd_dev_sg_table_t containing scatterlists */
  61         struct rd_dev_sg_table *sg_table_array;
  62         /* Ramdisk HBA device is connected to */
  63         struct rd_host *rd_host;
  64 } ____cacheline_aligned;
  65
  66 struct rd_host {
  67         u32             rd_host_dev_id_count;
  68         u32             rd_host_id;             /* Unique Ramdisk Host ID */
  69 } ____cacheline_aligned;
  70
  71 #endif /* TARGET_CORE_RD_H */