HBA_GetFcpTargetMapping

, HBA_GetFcpTargetMappingV2

- retrieve mapping between FCP-2 discovered devices and operating system SCSI information

Synopsis

cc [ flag… ] file… -lHBAAPI [ library… ]
#include <hbaapi.h>

HBA_STATUS HBA_GetFcpTargetMapping(HBA_HANDLE handle,
     HBA_FCPTARGETMAPPING *mapping);

HBA_STATUS HBA_GetFcpTargetMappingV2(HBA_HANDLE handle,
     HBA_WWN hbaPortWWN, HBA_FCPTARGETMAPPINGV2 *mapping);

Parameters

handle

an open handle returned from HBA_OpenAdapter(3HBAAPI)

mapping

a buffer in which to store the mapping entries. The mapping->NumberOfEntries member must indicate the maximum number of entries that will fit within the buffer. On completion, the mapping->NumberOfEntries member indicates the actual number of mapping entries for the HBA. This value can be greater than the number of entries the buffer can store.

hbaPortWWN

the Port Name of the local HBA Port for which the caller is requesting target mappings.

Description

The HBA_GetFcpTargetMapping() function retrieves the current set of mappings between FCP LUNs and SCSI LUNs for a given HBA port.

The HBA_GetFcpTargetMappingV2() function retrieves the current set of mappings between FCP LUNs and SCSI LUNs for a given HBA. The mapping also includes a Logical Unit Unique Identifier for each logical unit.

Return Values

The HBA_GetFcpTargetMappingV2() function returns the following values:

HBA_STATUS_ERROR_ILLEGAL_WWN

The port WWN specified by hbaPortWWN is not a valid port WWN on the specified HBA

HBA_STATUS_ERROR_NOT_SUPPORTED

Target mappings are not supported on the HBA.

HBA_STATUS_ERROR

An error occurred.

The HBA_GetFcpTargetMapping() and HBA_GetFcpTargetMappingV2() functions return the following values:

HBA_STATUS_OK

The HBA was able to retrieve information.

HBA_STATUS_ERROR_MORE_DATA

A larger buffer is required. The value of mapping->NumberOfEntries after the call indicates the total number of entries available. The caller should reallocate the buffer large enough to accomodate the indicated number of entries and reissue the routine.

In the event that other error values are returned, the value of mapping->NumberOfEntries after the call should be checked, and if greater than the value before the call, a larger buffer should be allocated for a retry of the routine.

Errors

See libhbaapi(3LIB) for general error status values.

Examples

Example 1 Return target mapping data.

The following example returns target mapping data. It initially allocates space for one target mapping. If the number of entries returned is greater than the allocated space, a new buffer with sufficient space is allocated and HBA_GetFcpTargetMapping() is called again.

map = (HBA_FCPTARGETMAPPING *)calloc(1,
    sizeof (HBA_FCPTARGETMAPPING));
status = HBA_GetFcpTargetMapping(handle, map);    
if (map->NumberOfEntries > 0) {
    HBA_UINT32  noe = map->NumberOfEntries;
    free(map);
    map = (HBA_FCPTARGETMAPPING *)calloc (1,
        sizeof (HBA_FCPTARGETMAPPING) +
        (sizeof (HBA_FCPSCSIENTRY)*(noe - 1)));
    map->NumberOfEntries = noe;
    if ((status = HBA_GetFcpTargetMapping(handle, map)) !=
            HBA_STATUS_OK) {
        fprintf(stderr, " Failed to get target "
            "mappings %d", status);
        free(map);
    } else {
        printf(" FCP Mapping entries: \n");
        for (cntr = 0;
            cntr < map->NumberOfEntries;
            cntr ++) {
        printf("  Path(%d): \"%s\"\n", cntr,
        map->entry[cntr].ScsiId.OSDeviceName);
        }
    }
}

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

HBA_OpenAdapter(3HBAAPI), libhbaapi(3LIB), attributes(5)

T11 FC-MI Specification

Bugs

The HBA_GetFcpTargetMapping() routine does not take a portindex to define which port of a multi-ported HBA the command should apply to. The behavior on multi-ported HBAs is vendor specific, and may result in mappings or bindings for all ports being intermixed in the response buffer. SNIA version 2 defines a HBA_GetFcpTargetMappingV2() which takes a Port WWN as an argument. This fixes the bug with multi-ported HBAs in HBA_GetFcpTargetMapping().