NAME

scsi_hba_pkt_alloc, scsi_hba_pkt_free - allocate and free a scsi_pkt structure

SYNOPSIS

#include <sys/scsi/scsi.h>
struct scsi_pkt *scsi_hba_pkt_alloc(dev_info_t *dip,


     struct scsi_address *ap, int cmdlen, int statuslen,


     int tgtlen, int hbalen,


     int (*callback)(caddr_t arg), caddr_t arg);

void scsi_hba_pkt_free(struct scsi_address *ap, struct scsi_pkt *pkt);

INTERFACE LEVEL

illumos architecture specific (illumos DDI).

PARAMETERS

dip

Pointer to a dev_info_t structure, defining the HBA driver instance.

Pointer to a scsi_address(9S) structure, defining the target instance.

cmdlen

Length in bytes to be allocated for the SCSI command descriptor block (CDB).

statuslen

Length in bytes to be allocated for the SCSI status completion block (SCB).

tgtlen

Length in bytes to be allocated for a private data area for the target driver's exclusive use.

hbalen

Length in bytes to be allocated for a private data area for the HBA driver's exclusive use.

callback

Indicates what scsi_hba_pkt_alloc() should do when resources are not available:

NULL_FUNC

Do not wait for resources. Return a NULL pointer.

SLEEP_FUNC

Wait indefinitely for resources.

arg

Must be NULL.

pkt

A pointer to a scsi_pkt(9S) structure.

DESCRIPTION

For scsi_hba_pkt_alloc():

The scsi_hba_pkt_alloc() function allocates space for a scsi_pkt structure. HBA drivers must use this interface when allocating a scsi_pkt from their tran_init_pkt(9E) entry point.

If callback is NULL_FUNC, scsi_hba_pkt_alloc() may not sleep when allocating resources, and callers should be prepared to deal with allocation failures.

The scsi_hba_pkt_alloc() function copies the scsi_address(9S) structure pointed to by ap to the pkt_address field in the scsi_pkt(9S).

The scsi_hba_pkt_alloc() function also allocates memory for these scsi_pkt(9S) data areas, and sets these fields to point to the allocated memory:

pkt_ha_private

HBA private data area.

pkt_private

Target driver private data area.

pkt_scbp

SCSI status completion block.

pkt_cdbp

SCSI command descriptor block.

For scsi_hba_pkt_free():

The scsi_hba_pkt_free() function frees the space allocated for the scsi_pkt(9S) structure.

RETURN VALUES

The scsi_hba_pkt_alloc() function returns a pointer to the scsi_pkt structure, or NULL if no space is available.

CONTEXT

The scsi_hba_pkt_alloc() function can be called from user, interrupt, or kernel context. Drivers must not allow scsi_hba_pkt_alloc() to sleep if called from an interrupt routine.

The scsi_hba_pkt_free() function can be called from user, interrupt, or kernel context.