[SCSI] FC Pass Thru support
Attached is the ELS/CT pass-thru patch for the FC Transport. The patch creates a generic framework that lays on top of bsg and the SGIO v4 ioctl in order to pass transaction requests to LLDD's. The interface supports the following operations: On an fc_host basis: Request login to the specified N_Port_ID, creating an fc_rport. Request logout of the specified N_Port_ID, deleting an fc_rport Send ELS request to specified N_Port_ID w/o requiring a login, and wait for ELS response. Send CT request to specified N_Port_ID and wait for CT response. Login is required, but LLDD is allowed to manage login and decide whether it stays in place after the request is satisfied. Vendor-Unique request. Allows a LLDD-specific request to be passed to the LLDD, and the passing of a response back to the application. On an fc_rport basis: Send ELS request to nport and wait for ELS response. Send CT request to nport and wait for CT response. The patch also exports several headers from include/scsi such that they can be available to user-space applications: include/scsi/scsi.h include/scsi/scsi_netlink.h include/scsi/scsi_netlink_fc.h include/scsi/scsi_bsg_fc.h For further information, refer to the last RFC: http://marc.info/?l=linux-scsi&m=123436574018579&w=2 Note: Documentation is still spotty and will be added later. [bharrosh@panasas.com: update for new block API] Signed-off-by: James Smart <james.smart@emulex.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
committed by
James Bottomley
parent
e349792a38
commit
9e4f5e2961
@ -33,7 +33,6 @@
|
||||
|
||||
struct scsi_transport_template;
|
||||
|
||||
|
||||
/*
|
||||
* FC Port definitions - Following FC HBAAPI guidelines
|
||||
*
|
||||
@ -352,6 +351,7 @@ struct fc_rport { /* aka fc_starget_attrs */
|
||||
struct delayed_work fail_io_work;
|
||||
struct work_struct stgt_delete_work;
|
||||
struct work_struct rport_delete_work;
|
||||
struct request_queue *rqst_q; /* bsg support */
|
||||
} __attribute__((aligned(sizeof(unsigned long))));
|
||||
|
||||
/* bit field values for struct fc_rport "flags" field: */
|
||||
@ -514,6 +514,9 @@ struct fc_host_attrs {
|
||||
struct workqueue_struct *work_q;
|
||||
char devloss_work_q_name[20];
|
||||
struct workqueue_struct *devloss_work_q;
|
||||
|
||||
/* bsg support */
|
||||
struct request_queue *rqst_q;
|
||||
};
|
||||
|
||||
#define shost_to_fc_host(x) \
|
||||
@ -579,6 +582,47 @@ struct fc_host_attrs {
|
||||
(((struct fc_host_attrs *)(x)->shost_data)->devloss_work_q)
|
||||
|
||||
|
||||
struct fc_bsg_buffer {
|
||||
unsigned int payload_len;
|
||||
int sg_cnt;
|
||||
struct scatterlist *sg_list;
|
||||
};
|
||||
|
||||
/* Values for fc_bsg_job->state_flags (bitflags) */
|
||||
#define FC_RQST_STATE_INPROGRESS 0
|
||||
#define FC_RQST_STATE_DONE 1
|
||||
|
||||
struct fc_bsg_job {
|
||||
struct Scsi_Host *shost;
|
||||
struct fc_rport *rport;
|
||||
struct device *dev;
|
||||
struct request *req;
|
||||
spinlock_t job_lock;
|
||||
unsigned int state_flags;
|
||||
unsigned int ref_cnt;
|
||||
void (*job_done)(struct fc_bsg_job *);
|
||||
|
||||
struct fc_bsg_request *request;
|
||||
struct fc_bsg_reply *reply;
|
||||
unsigned int request_len;
|
||||
unsigned int reply_len;
|
||||
/*
|
||||
* On entry : reply_len indicates the buffer size allocated for
|
||||
* the reply.
|
||||
*
|
||||
* Upon completion : the message handler must set reply_len
|
||||
* to indicates the size of the reply to be returned to the
|
||||
* caller.
|
||||
*/
|
||||
|
||||
/* DMA payloads for the request/response */
|
||||
struct fc_bsg_buffer request_payload;
|
||||
struct fc_bsg_buffer reply_payload;
|
||||
|
||||
void *dd_data; /* Used for driver-specific storage */
|
||||
};
|
||||
|
||||
|
||||
/* The functions by which the transport class and the driver communicate */
|
||||
struct fc_function_template {
|
||||
void (*get_rport_dev_loss_tmo)(struct fc_rport *);
|
||||
@ -614,9 +658,14 @@ struct fc_function_template {
|
||||
int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int);
|
||||
int (* it_nexus_response)(struct Scsi_Host *, u64, int);
|
||||
|
||||
/* bsg support */
|
||||
int (*bsg_request)(struct fc_bsg_job *);
|
||||
int (*bsg_timeout)(struct fc_bsg_job *);
|
||||
|
||||
/* allocation lengths for host-specific data */
|
||||
u32 dd_fcrport_size;
|
||||
u32 dd_fcvport_size;
|
||||
u32 dd_bsg_size;
|
||||
|
||||
/*
|
||||
* The driver sets these to tell the transport class it
|
||||
@ -737,7 +786,6 @@ fc_vport_set_state(struct fc_vport *vport, enum fc_vport_state new_state)
|
||||
vport->vport_state = new_state;
|
||||
}
|
||||
|
||||
|
||||
struct scsi_transport_template *fc_attach_transport(
|
||||
struct fc_function_template *);
|
||||
void fc_release_transport(struct scsi_transport_template *);
|
||||
|
Reference in New Issue
Block a user