0001
0002 #ifndef __LIBSRP_H__
0003 #define __LIBSRP_H__
0004
0005 #include <linux/list.h>
0006 #include <linux/kfifo.h>
0007 #include <scsi/srp.h>
0008
0009 enum srp_valid {
0010 INVALIDATE_CMD_RESP_EL = 0,
0011 VALID_CMD_RESP_EL = 0x80,
0012 VALID_INIT_MSG = 0xC0,
0013 VALID_TRANS_EVENT = 0xFF
0014 };
0015
0016 enum srp_format {
0017 SRP_FORMAT = 1,
0018 MAD_FORMAT = 2,
0019 OS400_FORMAT = 3,
0020 AIX_FORMAT = 4,
0021 LINUX_FORMAT = 5,
0022 MESSAGE_IN_CRQ = 6
0023 };
0024
0025 enum srp_init_msg {
0026 INIT_MSG = 1,
0027 INIT_COMPLETE_MSG = 2
0028 };
0029
0030 enum srp_trans_event {
0031 UNUSED_FORMAT = 0,
0032 PARTNER_FAILED = 1,
0033 PARTNER_DEREGISTER = 2,
0034 MIGRATED = 6,
0035 PREPARE_FOR_SUSPEND = 9,
0036 RESUME_FROM_SUSP = 0xA
0037 };
0038
0039 enum srp_status {
0040 CRQ_ENTRY_OVERWRITTEN = 0x20,
0041 HEADER_DESCRIPTOR = 0xF1,
0042 PING = 0xF5,
0043 PING_RESPONSE = 0xF6
0044 };
0045
0046 enum srp_mad_version {
0047 MAD_VERSION_1 = 1
0048 };
0049
0050 enum srp_os_type {
0051 OS400 = 1,
0052 LINUX = 2,
0053 AIX = 3,
0054 OFW = 4
0055 };
0056
0057 enum srp_task_attributes {
0058 SRP_SIMPLE_TASK = 0,
0059 SRP_HEAD_TASK = 1,
0060 SRP_ORDERED_TASK = 2,
0061 SRP_ACA_TASK = 4
0062 };
0063
0064 enum {
0065 SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE = 0,
0066 SRP_REQUEST_FIELDS_INVALID = 2,
0067 SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED = 4,
0068 SRP_TASK_MANAGEMENT_FUNCTION_FAILED = 5
0069 };
0070
0071 struct srp_buf {
0072 dma_addr_t dma;
0073 void *buf;
0074 };
0075
0076 struct srp_queue {
0077 void *pool;
0078 void *items;
0079 struct kfifo queue;
0080 spinlock_t lock;
0081 };
0082
0083 struct srp_target {
0084 struct device *dev;
0085
0086 spinlock_t lock;
0087 struct list_head cmd_queue;
0088
0089 size_t srp_iu_size;
0090 struct srp_queue iu_queue;
0091 size_t rx_ring_size;
0092 struct srp_buf **rx_ring;
0093
0094 void *ldata;
0095 };
0096
0097 struct iu_entry {
0098 struct srp_target *target;
0099
0100 struct list_head ilist;
0101 dma_addr_t remote_token;
0102 unsigned long flags;
0103
0104 struct srp_buf *sbuf;
0105 u16 iu_len;
0106 };
0107
0108 struct ibmvscsis_cmd;
0109
0110 typedef int (srp_rdma_t)(struct ibmvscsis_cmd *, struct scatterlist *, int,
0111 struct srp_direct_buf *, int,
0112 enum dma_data_direction, unsigned int);
0113 int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
0114 void srp_target_free(struct srp_target *);
0115 struct iu_entry *srp_iu_get(struct srp_target *);
0116 void srp_iu_put(struct iu_entry *);
0117 int srp_transfer_data(struct ibmvscsis_cmd *, struct srp_cmd *,
0118 srp_rdma_t, int, int);
0119 u64 srp_data_length(struct srp_cmd *cmd, enum dma_data_direction dir);
0120 int srp_get_desc_table(struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
0121 u64 *data_len);
0122 static inline int srp_cmd_direction(struct srp_cmd *cmd)
0123 {
0124 return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
0125 }
0126
0127 #endif
