mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2c47f9efbe
tgt uses scsi_host as I_T nexus. This works for ibmvstgt because it creates one scsi_host for one initiator. However, other target drivers don't work like that. This adds I_T nexus support, which enable one scsi_host to handle multiple initiators. New scsi_tgt_it_nexus_create/destroy functions are expected be called transport classes. For example, ibmvstgt creates an initiator remote port, then the srp transport calls tgt_it_nexus_create. tgt doesn't manages I_T nexus, instead it tells tgtd, user-space daemon, to create a new I_T nexus. On the receiving the response from tgtd, tgt calls shost->transportt->it_nexus_response. transports should notify a lld. The srp transport uses it_nexus_response callback in srp_function_template to do that. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
33 lines
1.2 KiB
C
33 lines
1.2 KiB
C
struct scsi_cmnd;
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struct scsi_lun;
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struct Scsi_Host;
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struct task_struct;
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/* tmp - will replace with SCSI logging stuff */
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#define eprintk(fmt, args...) \
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do { \
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printk("%s(%d) " fmt, __FUNCTION__, __LINE__, ##args); \
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} while (0)
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#define dprintk(fmt, args...)
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/* #define dprintk eprintk */
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extern void scsi_tgt_if_exit(void);
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extern int scsi_tgt_if_init(void);
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extern int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, u64 it_nexus_id,
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struct scsi_lun *lun, u64 tag);
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extern int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 it_nexus_id,
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u64 tag);
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extern int scsi_tgt_kspace_exec(int host_no, u64 it_nexus_id, int result, u64 tag,
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unsigned long uaddr, u32 len,
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unsigned long sense_uaddr, u32 sense_len, u8 rw);
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extern int scsi_tgt_uspace_send_tsk_mgmt(int host_no, u64 it_nexus_id,
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int function, u64 tag,
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struct scsi_lun *scsilun, void *data);
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extern int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 it_nexus_id,
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u64 mid, int result);
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extern int scsi_tgt_uspace_send_it_nexus_request(int host_no, u64 it_nexus_id,
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int function, char *initiator);
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extern int scsi_tgt_kspace_it_nexus_rsp(int host_no, u64 it_nexus_id, int result);
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