[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>
diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index 68a8d87..fc50bd6 100644
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -33,7 +33,6 @@
struct scsi_transport_template;
-
/*
* FC Port definitions - Following FC HBAAPI guidelines
*
@@ -352,6 +351,7 @@
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 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 *)(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 @@
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 @@
vport->vport_state = new_state;
}
-
struct scsi_transport_template *fc_attach_transport(
struct fc_function_template *);
void fc_release_transport(struct scsi_transport_template *);