41c80be24b
There is no need to define these PNETID related constants in the pnet.h file, since they are just used locally within pnet.c. Just code cleanup, no functional change. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* IBM System z PNET ID Support
|
|
*
|
|
* Copyright IBM Corp. 2018
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/types.h>
|
|
#include <asm/ccwgroup.h>
|
|
#include <asm/ccwdev.h>
|
|
#include <asm/pnet.h>
|
|
|
|
#define PNETIDS_LEN 64 /* Total utility string length in bytes
|
|
* to cover up to 4 PNETIDs of 16 bytes
|
|
* for up to 4 device ports
|
|
*/
|
|
#define MAX_PNETID_LEN 16 /* Max.length of a single port PNETID */
|
|
#define MAX_PNETID_PORTS (PNETIDS_LEN / MAX_PNETID_LEN)
|
|
/* Max. # of ports with a PNETID */
|
|
|
|
/*
|
|
* Get the PNETIDs from a device.
|
|
* s390 hardware supports the definition of a so-called Physical Network
|
|
* Identifier (short PNETID) per network device port. These PNETIDs can be
|
|
* used to identify network devices that are attached to the same physical
|
|
* network (broadcast domain).
|
|
*
|
|
* The device can be
|
|
* - a ccwgroup device with all bundled subchannels having the same PNETID
|
|
* - a PCI attached network device
|
|
*
|
|
* Returns:
|
|
* 0: PNETIDs extracted from device.
|
|
* -ENOMEM: No memory to extract utility string.
|
|
* -EOPNOTSUPP: Device type without utility string support
|
|
*/
|
|
static int pnet_ids_by_device(struct device *dev, u8 *pnetids)
|
|
{
|
|
memset(pnetids, 0, PNETIDS_LEN);
|
|
if (dev_is_ccwgroup(dev)) {
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
u8 *util_str;
|
|
|
|
util_str = ccw_device_get_util_str(gdev->cdev[0], 0);
|
|
if (!util_str)
|
|
return -ENOMEM;
|
|
memcpy(pnetids, util_str, PNETIDS_LEN);
|
|
kfree(util_str);
|
|
return 0;
|
|
}
|
|
if (dev_is_pci(dev)) {
|
|
struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
|
|
|
|
memcpy(pnetids, zdev->util_str, sizeof(zdev->util_str));
|
|
return 0;
|
|
}
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/*
|
|
* Extract the pnetid for a device port.
|
|
*
|
|
* Return 0 if a pnetid is found and -ENOENT otherwise.
|
|
*/
|
|
int pnet_id_by_dev_port(struct device *dev, unsigned short port, u8 *pnetid)
|
|
{
|
|
u8 pnetids[MAX_PNETID_PORTS][MAX_PNETID_LEN];
|
|
static const u8 zero[MAX_PNETID_LEN] = { 0 };
|
|
int rc = 0;
|
|
|
|
if (!dev || port >= MAX_PNETID_PORTS)
|
|
return -ENOENT;
|
|
|
|
if (!pnet_ids_by_device(dev, (u8 *)pnetids) &&
|
|
memcmp(pnetids[port], zero, MAX_PNETID_LEN))
|
|
memcpy(pnetid, pnetids[port], MAX_PNETID_LEN);
|
|
else
|
|
rc = -ENOENT;
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnet_id_by_dev_port);
|
|
|
|
MODULE_DESCRIPTION("pnetid determination from utility strings");
|
|
MODULE_LICENSE("GPL");
|