| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| 297 | 94.89% | 1 | 50.00% | |
| 16 | 5.11% | 1 | 50.00% | |
| Total | 313 | 2 |
| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Ursula Braun-Krahl | 297 | 94.89% | 1 | 50.00% |
| Hans Wippel | 16 | 5.11% | 1 | 50.00% |
| Total | 313 | 2 |
// 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> #include <asm/ebcdic.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); EBCASC(pnetids, 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)); EBCASC(pnetids, 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");