From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- net/phonet/pn_dev.c | 459 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 459 insertions(+) create mode 100644 net/phonet/pn_dev.c (limited to 'net/phonet/pn_dev.c') diff --git a/net/phonet/pn_dev.c b/net/phonet/pn_dev.c new file mode 100644 index 000000000..1272d49cd --- /dev/null +++ b/net/phonet/pn_dev.c @@ -0,0 +1,459 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * File: pn_dev.c + * + * Phonet network device + * + * Copyright (C) 2008 Nokia Corporation. + * + * Authors: Sakari Ailus + * Rémi Denis-Courmont + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct phonet_routes { + spinlock_t lock; + struct net_device __rcu *table[64]; +}; + +struct phonet_net { + struct phonet_device_list pndevs; + struct phonet_routes routes; +}; + +static unsigned int phonet_net_id __read_mostly; + +static struct phonet_net *phonet_pernet(struct net *net) +{ + return net_generic(net, phonet_net_id); +} + +struct phonet_device_list *phonet_device_list(struct net *net) +{ + struct phonet_net *pnn = phonet_pernet(net); + return &pnn->pndevs; +} + +/* Allocate new Phonet device. */ +static struct phonet_device *__phonet_device_alloc(struct net_device *dev) +{ + struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); + struct phonet_device *pnd = kmalloc_obj(*pnd, GFP_ATOMIC); + if (pnd == NULL) + return NULL; + pnd->netdev = dev; + bitmap_zero(pnd->addrs, 64); + + lockdep_assert_held(&pndevs->lock); + list_add_rcu(&pnd->list, &pndevs->list); + return pnd; +} + +static struct phonet_device *__phonet_get(struct net_device *dev) +{ + struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); + struct phonet_device *pnd; + + lockdep_assert_held(&pndevs->lock); + + list_for_each_entry(pnd, &pndevs->list, list) { + if (pnd->netdev == dev) + return pnd; + } + return NULL; +} + +static struct phonet_device *__phonet_get_rcu(struct net_device *dev) +{ + struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); + struct phonet_device *pnd; + + list_for_each_entry_rcu(pnd, &pndevs->list, list) { + if (pnd->netdev == dev) + return pnd; + } + return NULL; +} + +static void phonet_device_destroy(struct net_device *dev) +{ + struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); + struct phonet_device *pnd; + + ASSERT_RTNL(); + + spin_lock(&pndevs->lock); + + pnd = __phonet_get(dev); + if (pnd) + list_del_rcu(&pnd->list); + + spin_unlock(&pndevs->lock); + + if (pnd) { + struct net *net = dev_net(dev); + u32 ifindex = dev->ifindex; + u8 addr; + + for_each_set_bit(addr, pnd->addrs, 64) + phonet_address_notify(net, RTM_DELADDR, ifindex, addr); + + kfree_rcu(pnd, rcu); + } +} + +struct net_device *phonet_device_get(struct net *net) +{ + struct phonet_device_list *pndevs = phonet_device_list(net); + struct phonet_device *pnd; + struct net_device *dev = NULL; + + rcu_read_lock(); + list_for_each_entry_rcu(pnd, &pndevs->list, list) { + dev = pnd->netdev; + BUG_ON(!dev); + + if ((dev->reg_state == NETREG_REGISTERED) && + ((pnd->netdev->flags & IFF_UP)) == IFF_UP) + break; + dev = NULL; + } + dev_hold(dev); + rcu_read_unlock(); + return dev; +} + +int phonet_address_add(struct net_device *dev, u8 addr) +{ + struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); + struct phonet_device *pnd; + int err = 0; + + spin_lock(&pndevs->lock); + + /* Find or create Phonet-specific device data */ + pnd = __phonet_get(dev); + if (pnd == NULL) + pnd = __phonet_device_alloc(dev); + if (unlikely(pnd == NULL)) + err = -ENOMEM; + else if (test_and_set_bit(addr >> 2, pnd->addrs)) + err = -EEXIST; + + spin_unlock(&pndevs->lock); + + return err; +} + +int phonet_address_del(struct net_device *dev, u8 addr) +{ + struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); + struct phonet_device *pnd; + int err = 0; + + spin_lock(&pndevs->lock); + + pnd = __phonet_get(dev); + if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) { + err = -EADDRNOTAVAIL; + pnd = NULL; + } else if (bitmap_empty(pnd->addrs, 64)) + list_del_rcu(&pnd->list); + else + pnd = NULL; + + spin_unlock(&pndevs->lock); + + if (pnd) + kfree_rcu(pnd, rcu); + + return err; +} + +/* Gets a source address toward a destination, through a interface. */ +u8 phonet_address_get(struct net_device *dev, u8 daddr) +{ + struct phonet_device *pnd; + u8 saddr; + + rcu_read_lock(); + pnd = __phonet_get_rcu(dev); + if (pnd) { + BUG_ON(bitmap_empty(pnd->addrs, 64)); + + /* Use same source address as destination, if possible */ + if (test_bit(daddr >> 2, pnd->addrs)) + saddr = daddr; + else + saddr = find_first_bit(pnd->addrs, 64) << 2; + } else + saddr = PN_NO_ADDR; + rcu_read_unlock(); + + if (saddr == PN_NO_ADDR) { + /* Fallback to another device */ + struct net_device *def_dev; + + def_dev = phonet_device_get(dev_net(dev)); + if (def_dev) { + if (def_dev != dev) + saddr = phonet_address_get(def_dev, daddr); + dev_put(def_dev); + } + } + return saddr; +} + +int phonet_address_lookup(struct net *net, u8 addr) +{ + struct phonet_device_list *pndevs = phonet_device_list(net); + struct phonet_device *pnd; + int err = -EADDRNOTAVAIL; + + rcu_read_lock(); + list_for_each_entry_rcu(pnd, &pndevs->list, list) { + /* Don't allow unregistering devices! */ + if ((pnd->netdev->reg_state != NETREG_REGISTERED) || + ((pnd->netdev->flags & IFF_UP)) != IFF_UP) + continue; + + if (test_bit(addr >> 2, pnd->addrs)) { + err = 0; + goto found; + } + } +found: + rcu_read_unlock(); + return err; +} + +/* automatically configure a Phonet device, if supported */ +static int phonet_device_autoconf(struct net_device *dev) +{ + struct if_phonet_req req; + int ret; + + if (!dev->netdev_ops->ndo_siocdevprivate) + return -EOPNOTSUPP; + + ret = dev->netdev_ops->ndo_siocdevprivate(dev, (struct ifreq *)&req, + NULL, SIOCPNGAUTOCONF); + if (ret < 0) + return ret; + + ASSERT_RTNL(); + ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device); + if (ret) + return ret; + + phonet_address_notify(dev_net(dev), RTM_NEWADDR, dev->ifindex, + req.ifr_phonet_autoconf.device); + return 0; +} + +static void phonet_route_autodel(struct net_device *dev) +{ + struct net *net = dev_net(dev); + DECLARE_BITMAP(deleted, 64); + u32 ifindex = dev->ifindex; + struct phonet_net *pnn; + unsigned int i; + + pnn = phonet_pernet(net); + + /* Remove left-over Phonet routes */ + bitmap_zero(deleted, 64); + + spin_lock(&pnn->routes.lock); + for (i = 0; i < 64; i++) { + if (rcu_access_pointer(pnn->routes.table[i]) == dev) { + RCU_INIT_POINTER(pnn->routes.table[i], NULL); + set_bit(i, deleted); + } + } + spin_unlock(&pnn->routes.lock); + + if (bitmap_empty(deleted, 64)) + return; /* short-circuit RCU */ + synchronize_rcu(); + for_each_set_bit(i, deleted, 64) { + rtm_phonet_notify(net, RTM_DELROUTE, ifindex, i); + dev_put(dev); + } +} + +/* notify Phonet of device events */ +static int phonet_device_notify(struct notifier_block *me, unsigned long what, + void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + + switch (what) { + case NETDEV_REGISTER: + if (dev->type == ARPHRD_PHONET) + phonet_device_autoconf(dev); + break; + case NETDEV_UNREGISTER: + phonet_device_destroy(dev); + phonet_route_autodel(dev); + break; + } + return 0; + +} + +static struct notifier_block phonet_device_notifier = { + .notifier_call = phonet_device_notify, + .priority = 0, +}; + +/* Per-namespace Phonet devices handling */ +static int __net_init phonet_init_net(struct net *net) +{ + struct phonet_net *pnn = phonet_pernet(net); + + if (!proc_create_net("phonet", 0, net->proc_net, &pn_sock_seq_ops, + sizeof(struct seq_net_private))) + return -ENOMEM; + + INIT_LIST_HEAD(&pnn->pndevs.list); + spin_lock_init(&pnn->pndevs.lock); + spin_lock_init(&pnn->routes.lock); + return 0; +} + +static void __net_exit phonet_exit_net(struct net *net) +{ + struct phonet_net *pnn = phonet_pernet(net); + + remove_proc_entry("phonet", net->proc_net); + WARN_ON_ONCE(!list_empty(&pnn->pndevs.list)); +} + +static struct pernet_operations phonet_net_ops = { + .init = phonet_init_net, + .exit = phonet_exit_net, + .id = &phonet_net_id, + .size = sizeof(struct phonet_net), +}; + +/* Initialize Phonet devices list */ +int __init phonet_device_init(void) +{ + int err; + + err = register_pernet_subsys(&phonet_net_ops); + if (err) + return err; + + if (!proc_create_net("pnresource", 0, init_net.proc_net, + &pn_res_seq_ops, sizeof(struct seq_net_private))) { + err = -ENOMEM; + goto err_pernet; + } + + err = register_netdevice_notifier(&phonet_device_notifier); + if (err) + goto err_proc; + + err = phonet_netlink_register(); + if (err) + goto err_notifier; + + return 0; + +err_notifier: + unregister_netdevice_notifier(&phonet_device_notifier); +err_proc: + remove_proc_entry("pnresource", init_net.proc_net); +err_pernet: + unregister_pernet_subsys(&phonet_net_ops); + return err; +} + +void phonet_device_exit(void) +{ + rtnl_unregister_all(PF_PHONET); + unregister_netdevice_notifier(&phonet_device_notifier); + remove_proc_entry("pnresource", init_net.proc_net); + unregister_pernet_subsys(&phonet_net_ops); +} + +int phonet_route_add(struct net_device *dev, u8 daddr) +{ + struct phonet_net *pnn = phonet_pernet(dev_net(dev)); + struct phonet_routes *routes = &pnn->routes; + int err = -EEXIST; + + daddr = daddr >> 2; + + spin_lock(&routes->lock); + if (routes->table[daddr] == NULL) { + rcu_assign_pointer(routes->table[daddr], dev); + dev_hold(dev); + err = 0; + } + spin_unlock(&routes->lock); + + return err; +} + +int phonet_route_del(struct net_device *dev, u8 daddr) +{ + struct phonet_net *pnn = phonet_pernet(dev_net(dev)); + struct phonet_routes *routes = &pnn->routes; + + daddr = daddr >> 2; + + spin_lock(&routes->lock); + if (rcu_access_pointer(routes->table[daddr]) == dev) + RCU_INIT_POINTER(routes->table[daddr], NULL); + else + dev = NULL; + spin_unlock(&routes->lock); + + if (!dev) + return -ENOENT; + + /* Note : our caller must call synchronize_rcu() and dev_put(dev) */ + + return 0; +} + +struct net_device *phonet_route_get_rcu(struct net *net, u8 daddr) +{ + struct phonet_net *pnn = phonet_pernet(net); + struct phonet_routes *routes = &pnn->routes; + struct net_device *dev; + + daddr >>= 2; + dev = rcu_dereference(routes->table[daddr]); + return dev; +} + +struct net_device *phonet_route_output(struct net *net, u8 daddr) +{ + struct phonet_net *pnn = phonet_pernet(net); + struct phonet_routes *routes = &pnn->routes; + struct net_device *dev; + + daddr >>= 2; + rcu_read_lock(); + dev = rcu_dereference(routes->table[daddr]); + dev_hold(dev); + rcu_read_unlock(); + + if (!dev) + dev = phonet_device_get(net); /* Default route */ + return dev; +} -- cgit v1.3.1