^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * IBM System z PNET ID Support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright IBM Corp. 2018
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/ccwgroup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/ccwdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/pnet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/ebcdic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define PNETIDS_LEN 64 /* Total utility string length in bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * to cover up to 4 PNETIDs of 16 bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * for up to 4 device ports
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define MAX_PNETID_LEN 16 /* Max.length of a single port PNETID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define MAX_PNETID_PORTS (PNETIDS_LEN / MAX_PNETID_LEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) /* Max. # of ports with a PNETID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * Get the PNETIDs from a device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * s390 hardware supports the definition of a so-called Physical Network
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Identifier (short PNETID) per network device port. These PNETIDs can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * used to identify network devices that are attached to the same physical
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * network (broadcast domain).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * The device can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * - a ccwgroup device with all bundled subchannels having the same PNETID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * - a PCI attached network device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * Returns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * 0: PNETIDs extracted from device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * -ENOMEM: No memory to extract utility string.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * -EOPNOTSUPP: Device type without utility string support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static int pnet_ids_by_device(struct device *dev, u8 *pnetids)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) memset(pnetids, 0, PNETIDS_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (dev_is_ccwgroup(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) u8 *util_str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) util_str = ccw_device_get_util_str(gdev->cdev[0], 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (!util_str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) memcpy(pnetids, util_str, PNETIDS_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) EBCASC(pnetids, PNETIDS_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) kfree(util_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (dev_is_pci(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) memcpy(pnetids, zdev->util_str, sizeof(zdev->util_str));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) EBCASC(pnetids, sizeof(zdev->util_str));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * Extract the pnetid for a device port.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * Return 0 if a pnetid is found and -ENOENT otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) int pnet_id_by_dev_port(struct device *dev, unsigned short port, u8 *pnetid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) u8 pnetids[MAX_PNETID_PORTS][MAX_PNETID_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static const u8 zero[MAX_PNETID_LEN] = { 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!dev || port >= MAX_PNETID_PORTS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (!pnet_ids_by_device(dev, (u8 *)pnetids) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) memcmp(pnetids[port], zero, MAX_PNETID_LEN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) memcpy(pnetid, pnetids[port], MAX_PNETID_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) rc = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) EXPORT_SYMBOL_GPL(pnet_id_by_dev_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) MODULE_DESCRIPTION("pnetid determination from utility strings");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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