diff --git a/net/core/dev.c b/net/core/dev.c index 0921609dfa81b70a13e0b4ca7852fde6ded7ed82..363c44b9be6368792382fad1a001292ced4398a0 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1,5 +1,5 @@ /* - * NET3 Protocol independent device support routines. + * NET3 Protocol independent device support routines. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License @@ -7,7 +7,7 @@ * 2 of the License, or (at your option) any later version. * * Derived from the non IP parts of dev.c 1.0.19 - * Authors: Ross Biro + * Authors: Ross Biro * Fred N. van Kempen, * Mark Evans, * @@ -21,9 +21,9 @@ * * Changes: * D.J. Barrow : Fixed bug where dev->refcnt gets set - * to 2 if register_netdev gets called - * before net_dev_init & also removed a - * few lines of code in the process. + * to 2 if register_netdev gets called + * before net_dev_init & also removed a + * few lines of code in the process. * Alan Cox : device private ioctl copies fields back. * Alan Cox : Transmit queue code does relevant * stunts to keep the queue safe. @@ -36,7 +36,7 @@ * Alan Cox : 100 backlog just doesn't cut it when * you start doing multicast video 8) * Alan Cox : Rewrote net_bh and list manager. - * Alan Cox : Fix ETH_P_ALL echoback lengths. + * Alan Cox : Fix ETH_P_ALL echoback lengths. * Alan Cox : Took out transmit every packet pass * Saved a few bytes in the ioctl handler * Alan Cox : Network driver sets packet type before @@ -46,7 +46,7 @@ * Richard Kooijman: Timestamp fixes. * Alan Cox : Wrong field in SIOCGIFDSTADDR * Alan Cox : Device lock protection. - * Alan Cox : Fixed nasty side effect of device close + * Alan Cox : Fixed nasty side effect of device close * changes. * Rudi Cilibrasi : Pass the right thing to * set_mac_address() @@ -67,8 +67,8 @@ * Paul Rusty Russell : SIOCSIFNAME * Pekka Riikonen : Netdev boot-time settings code * Andrew Morton : Make unregister_netdevice wait - * indefinitely on dev->refcnt - * J Hadi Salim : - Backlog queue sampling + * indefinitely on dev->refcnt + * J Hadi Salim : - Backlog queue sampling * - netif_rx() feedback */ @@ -192,7 +192,8 @@ static seqcount_t devnet_rename_seq; static inline void dev_base_seq_inc(struct net *net) { - while (++net->dev_base_seq == 0); + while (++net->dev_base_seq == 0) + ; } static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) @@ -274,8 +275,8 @@ EXPORT_PER_CPU_SYMBOL(softnet_data); * register_netdevice() inits txq->_xmit_lock and sets lockdep class * according to dev->type */ -static const unsigned short netdev_lock_type[] = - {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, +static const unsigned short netdev_lock_type[] = { + ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, @@ -291,22 +292,22 @@ static const unsigned short netdev_lock_type[] = ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; -static const char *const netdev_lock_name[] = - {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", - "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", - "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", - "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", - "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", - "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", - "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", - "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", - "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", - "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", - "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", - "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", - "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", - "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", - "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; +static const char *const netdev_lock_name[] = { + "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", + "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", + "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", + "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", + "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", + "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", + "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", + "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", + "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", + "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", + "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", + "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", + "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", + "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", + "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; @@ -352,10 +353,11 @@ static inline void netdev_set_addr_lockdep_class(struct net_device *dev) #endif /******************************************************************************* + * + * Protocol management and registration routines + * + *******************************************************************************/ - Protocol management and registration routines - -*******************************************************************************/ /* * Add a protocol ID to the list. Now that the input handler is @@ -538,10 +540,10 @@ void dev_remove_offload(struct packet_offload *po) EXPORT_SYMBOL(dev_remove_offload); /****************************************************************************** - - Device Boot-time Settings Routines - -*******************************************************************************/ + * + * Device Boot-time Settings Routines + * + ******************************************************************************/ /* Boot time configuration table */ static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; @@ -574,13 +576,13 @@ static int netdev_boot_setup_add(char *name, struct ifmap *map) } /** - * netdev_boot_setup_check - check boot time settings - * @dev: the netdevice + * netdev_boot_setup_check - check boot time settings + * @dev: the netdevice * - * Check boot time settings for the device. - * The found settings are set for the device to be used - * later in the device probing. - * Returns 0 if no settings found, 1 if they are. + * Check boot time settings for the device. + * The found settings are set for the device to be used + * later in the device probing. + * Returns 0 if no settings found, 1 if they are. */ int netdev_boot_setup_check(struct net_device *dev) { @@ -590,10 +592,10 @@ int netdev_boot_setup_check(struct net_device *dev) for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && !strcmp(dev->name, s[i].name)) { - dev->irq = s[i].map.irq; - dev->base_addr = s[i].map.base_addr; - dev->mem_start = s[i].map.mem_start; - dev->mem_end = s[i].map.mem_end; + dev->irq = s[i].map.irq; + dev->base_addr = s[i].map.base_addr; + dev->mem_start = s[i].map.mem_start; + dev->mem_end = s[i].map.mem_end; return 1; } } @@ -603,14 +605,14 @@ EXPORT_SYMBOL(netdev_boot_setup_check); /** - * netdev_boot_base - get address from boot time settings - * @prefix: prefix for network device - * @unit: id for network device + * netdev_boot_base - get address from boot time settings + * @prefix: prefix for network device + * @unit: id for network device * - * Check boot time settings for the base address of device. - * The found settings are set for the device to be used - * later in the device probing. - * Returns 0 if no settings found. + * Check boot time settings for the base address of device. + * The found settings are set for the device to be used + * later in the device probing. + * Returns 0 if no settings found. */ unsigned long netdev_boot_base(const char *prefix, int unit) { @@ -663,10 +665,10 @@ int __init netdev_boot_setup(char *str) __setup("netdev=", netdev_boot_setup); /******************************************************************************* - - Device Interface Subroutines - -*******************************************************************************/ + * + * Device Interface Subroutines + * + *******************************************************************************/ /** * dev_get_iflink - get 'iflink' value of a interface @@ -737,15 +739,15 @@ struct net_device *__dev_get_by_name(struct net *net, const char *name) EXPORT_SYMBOL(__dev_get_by_name); /** - * dev_get_by_name_rcu - find a device by its name - * @net: the applicable net namespace - * @name: name to find + * dev_get_by_name_rcu - find a device by its name + * @net: the applicable net namespace + * @name: name to find * - * Find an interface by name. - * If the name is found a pointer to the device is returned. - * If the name is not found then %NULL is returned. - * The reference counters are not incremented so the caller must be - * careful with locks. The caller must hold RCU lock. + * Find an interface by name. + * If the name is found a pointer to the device is returned. + * If the name is not found then %NULL is returned. + * The reference counters are not incremented so the caller must be + * careful with locks. The caller must hold RCU lock. */ struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) @@ -1289,8 +1291,8 @@ void netdev_state_change(struct net_device *dev) EXPORT_SYMBOL(netdev_state_change); /** - * netdev_notify_peers - notify network peers about existence of @dev - * @dev: network device + * netdev_notify_peers - notify network peers about existence of @dev + * @dev: network device * * Generate traffic such that interested network peers are aware of * @dev, such as by generating a gratuitous ARP. This may be used when @@ -1518,17 +1520,17 @@ static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, static int dev_boot_phase = 1; /** - * register_netdevice_notifier - register a network notifier block - * @nb: notifier + * register_netdevice_notifier - register a network notifier block + * @nb: notifier * - * Register a notifier to be called when network device events occur. - * The notifier passed is linked into the kernel structures and must - * not be reused until it has been unregistered. A negative errno code - * is returned on a failure. + * Register a notifier to be called when network device events occur. + * The notifier passed is linked into the kernel structures and must + * not be reused until it has been unregistered. A negative errno code + * is returned on a failure. * - * When registered all registration and up events are replayed - * to the new notifier to allow device to have a race free - * view of the network device list. + * When registered all registration and up events are replayed + * to the new notifier to allow device to have a race free + * view of the network device list. */ int register_netdevice_notifier(struct notifier_block *nb) @@ -1585,17 +1587,17 @@ int register_netdevice_notifier(struct notifier_block *nb) EXPORT_SYMBOL(register_netdevice_notifier); /** - * unregister_netdevice_notifier - unregister a network notifier block - * @nb: notifier + * unregister_netdevice_notifier - unregister a network notifier block + * @nb: notifier * - * Unregister a notifier previously registered by - * register_netdevice_notifier(). The notifier is unlinked into the - * kernel structures and may then be reused. A negative errno code - * is returned on a failure. + * Unregister a notifier previously registered by + * register_netdevice_notifier(). The notifier is unlinked into the + * kernel structures and may then be reused. A negative errno code + * is returned on a failure. * - * After unregistering unregister and down device events are synthesized - * for all devices on the device list to the removed notifier to remove - * the need for special case cleanup code. + * After unregistering unregister and down device events are synthesized + * for all devices on the device list to the removed notifier to remove + * the need for special case cleanup code. */ int unregister_netdevice_notifier(struct notifier_block *nb) @@ -2496,6 +2498,7 @@ u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb, if (dev->num_tc) { u8 tc = netdev_get_prio_tc_map(dev, skb->priority); + qoffset = dev->tc_to_txq[tc].offset; qcount = dev->tc_to_txq[tc].count; } @@ -2717,9 +2720,11 @@ static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) { #ifdef CONFIG_HIGHMEM int i; + if (!(dev->features & NETIF_F_HIGHDMA)) { for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + if (PageHighMem(skb_frag_page(frag))) return 1; } @@ -2733,6 +2738,7 @@ static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; dma_addr_t addr = page_to_phys(skb_frag_page(frag)); + if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask) return 1; } @@ -3208,6 +3214,7 @@ static u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb) if (queue_index < 0 || skb->ooo_okay || queue_index >= dev->real_num_tx_queues) { int new_index = get_xps_queue(dev, skb); + if (new_index < 0) new_index = skb_tx_hash(dev, skb); @@ -3237,6 +3244,7 @@ struct netdev_queue *netdev_pick_tx(struct net_device *dev, if (dev->real_num_tx_queues != 1) { const struct net_device_ops *ops = dev->netdev_ops; + if (ops->ndo_select_queue) queue_index = ops->ndo_select_queue(dev, skb, accel_priv, __netdev_pick_tx); @@ -3325,16 +3333,16 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) } /* The device has no queue. Common case for software devices: - loopback, all the sorts of tunnels... + * loopback, all the sorts of tunnels... - Really, it is unlikely that netif_tx_lock protection is necessary - here. (f.e. loopback and IP tunnels are clean ignoring statistics - counters.) - However, it is possible, that they rely on protection - made by us here. + * Really, it is unlikely that netif_tx_lock protection is necessary + * here. (f.e. loopback and IP tunnels are clean ignoring statistics + * counters.) + * However, it is possible, that they rely on protection + * made by us here. - Check this and shot the lock. It is not prone from deadlocks. - Either shot noqueue qdisc, it is even simpler 8) + * Check this and shot the lock. It is not prone from deadlocks. + *Either shot noqueue qdisc, it is even simpler 8) */ if (dev->flags & IFF_UP) { int cpu = smp_processor_id(); /* ok because BHs are off */ @@ -3396,9 +3404,9 @@ int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv) EXPORT_SYMBOL(dev_queue_xmit_accel); -/*======================================================================= - Receiver routines - =======================================================================*/ +/************************************************************************* + * Receiver routines + *************************************************************************/ int netdev_max_backlog __read_mostly = 1000; EXPORT_SYMBOL(netdev_max_backlog); @@ -3766,6 +3774,7 @@ static int netif_rx_internal(struct sk_buff *skb) #endif { unsigned int qtail; + ret = enqueue_to_backlog(skb, get_cpu(), &qtail); put_cpu(); } @@ -3825,6 +3834,7 @@ static __latent_entropy void net_tx_action(struct softirq_action *h) while (clist) { struct sk_buff *skb = clist; + clist = clist->next; WARN_ON(atomic_read(&skb->users)); @@ -5661,6 +5671,7 @@ static int netdev_adjacent_sysfs_add(struct net_device *dev, struct list_head *dev_list) { char linkname[IFNAMSIZ+7]; + sprintf(linkname, dev_list == &dev->adj_list.upper ? "upper_%s" : "lower_%s", adj_dev->name); return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), @@ -5671,6 +5682,7 @@ static void netdev_adjacent_sysfs_del(struct net_device *dev, struct list_head *dev_list) { char linkname[IFNAMSIZ+7]; + sprintf(linkname, dev_list == &dev->adj_list.upper ? "upper_%s" : "lower_%s", name); sysfs_remove_link(&(dev->dev.kobj), linkname); @@ -5940,6 +5952,7 @@ void netdev_upper_dev_unlink(struct net_device *dev, struct net_device *upper_dev) { struct netdev_notifier_changeupper_info changeupper_info; + ASSERT_RTNL(); changeupper_info.upper_dev = upper_dev; @@ -6358,8 +6371,8 @@ int __dev_change_flags(struct net_device *dev, unsigned int flags) } /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI - is important. Some (broken) drivers set IFF_PROMISC, when - IFF_ALLMULTI is requested not asking us and not reporting. + * is important. Some (broken) drivers set IFF_PROMISC, when + * IFF_ALLMULTI is requested not asking us and not reporting. */ if ((flags ^ dev->gflags) & IFF_ALLMULTI) { int inc = (flags & IFF_ALLMULTI) ? 1 : -1; @@ -6657,6 +6670,7 @@ EXPORT_SYMBOL(dev_change_xdp_fd); static int dev_new_index(struct net *net) { int ifindex = net->ifindex; + for (;;) { if (++ifindex <= 0) ifindex = 1; @@ -6723,8 +6737,8 @@ static void rollback_registered_many(struct list_head *head) /* Notify protocols, that we are about to destroy - this device. They should clean all the things. - */ + * this device. They should clean all the things. + */ call_netdevice_notifiers(NETDEV_UNREGISTER, dev); if (!dev->rtnl_link_ops || @@ -7070,6 +7084,7 @@ void netif_tx_stop_all_queues(struct net_device *dev) for (i = 0; i < dev->num_tx_queues; i++) { struct netdev_queue *txq = netdev_get_tx_queue(dev, i); + netif_tx_stop_queue(txq); } } @@ -7544,17 +7559,17 @@ void netdev_freemem(struct net_device *dev) } /** - * alloc_netdev_mqs - allocate network device - * @sizeof_priv: size of private data to allocate space for - * @name: device name format string - * @name_assign_type: origin of device name - * @setup: callback to initialize device - * @txqs: the number of TX subqueues to allocate - * @rxqs: the number of RX subqueues to allocate - * - * Allocates a struct net_device with private data area for driver use - * and performs basic initialization. Also allocates subqueue structs - * for each queue on the device. + * alloc_netdev_mqs - allocate network device + * @sizeof_priv: size of private data to allocate space for + * @name: device name format string + * @name_assign_type: origin of device name + * @setup: callback to initialize device + * @txqs: the number of TX subqueues to allocate + * @rxqs: the number of RX subqueues to allocate + * + * Allocates a struct net_device with private data area for driver use + * and performs basic initialization. Also allocates subqueue structs + * for each queue on the device. */ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, unsigned char name_assign_type, @@ -7666,13 +7681,13 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, EXPORT_SYMBOL(alloc_netdev_mqs); /** - * free_netdev - free network device - * @dev: device + * free_netdev - free network device + * @dev: device * - * This function does the last stage of destroying an allocated device - * interface. The reference to the device object is released. - * If this is the last reference then it will be freed. - * Must be called in process context. + * This function does the last stage of destroying an allocated device + * interface. The reference to the device object is released. If this + * is the last reference then it will be freed.Must be called in process + * context. */ void free_netdev(struct net_device *dev) { @@ -7854,12 +7869,12 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char dev_shutdown(dev); /* Notify protocols, that we are about to destroy - this device. They should clean all the things. - - Note that dev->reg_state stays at NETREG_REGISTERED. - This is wanted because this way 8021q and macvlan know - the device is just moving and can keep their slaves up. - */ + * this device. They should clean all the things. + * + * Note that dev->reg_state stays at NETREG_REGISTERED. + * This is wanted because this way 8021q and macvlan know + * the device is just moving and can keep their slaves up. + */ call_netdevice_notifiers(NETDEV_UNREGISTER, dev); rcu_barrier(); call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);