EXPORT_SYMBOL(dev_getfirstbyhwtype);
/**
- * dev_get_by_flags - find any device with given flags
+ * dev_get_by_flags_rcu - find any device with given flags
* @net: the applicable net namespace
* @if_flags: IFF_* values
* @mask: bitmask of bits in if_flags to check
*
* Search for any interface with the given flags. Returns NULL if a device
- * is not found or a pointer to the device. The device returned has
- * had a reference added and the pointer is safe until the user calls
- * dev_put to indicate they have finished with it.
+ * is not found or a pointer to the device. Must be called inside
+ * rcu_read_lock(), and result refcount is unchanged.
*/
-struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
+struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
unsigned short mask)
{
struct net_device *dev, *ret;
ret = NULL;
- rcu_read_lock();
for_each_netdev_rcu(net, dev) {
if (((dev->flags ^ if_flags) & mask) == 0) {
- dev_hold(dev);
ret = dev;
break;
}
}
- rcu_read_unlock();
return ret;
}
-EXPORT_SYMBOL(dev_get_by_flags);
+EXPORT_SYMBOL(dev_get_by_flags_rcu);
/**
* dev_valid_name - check if name is okay for network device
void dev_kfree_skb_irq(struct sk_buff *skb)
{
- if (atomic_dec_and_test(&skb->users)) {
+ if (!skb->destructor)
+ dev_kfree_skb(skb);
+ else if (atomic_dec_and_test(&skb->users)) {
struct softnet_data *sd;
unsigned long flags;
struct netdev_queue *txq)
{
spinlock_t *root_lock = qdisc_lock(q);
+ bool contended = qdisc_is_running(q);
int rc;
+ /*
+ * Heuristic to force contended enqueues to serialize on a
+ * separate lock before trying to get qdisc main lock.
+ * This permits __QDISC_STATE_RUNNING owner to get the lock more often
+ * and dequeue packets faster.
+ */
+ if (unlikely(contended))
+ spin_lock(&q->busylock);
+
spin_lock(root_lock);
if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
kfree_skb(skb);
rc = NET_XMIT_DROP;
} else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
- !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
+ qdisc_run_begin(q)) {
/*
* This is a work-conserving queue; there are no old skbs
* waiting to be sent out; and the qdisc is not running -
if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
skb_dst_force(skb);
__qdisc_update_bstats(q, skb->len);
- if (sch_direct_xmit(skb, q, dev, txq, root_lock))
+ if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
+ if (unlikely(contended)) {
+ spin_unlock(&q->busylock);
+ contended = false;
+ }
__qdisc_run(q);
- else
- clear_bit(__QDISC_STATE_RUNNING, &q->state);
+ } else
+ qdisc_run_end(q);
rc = NET_XMIT_SUCCESS;
} else {
skb_dst_force(skb);
rc = qdisc_enqueue_root(skb, q);
- qdisc_run(q);
+ if (qdisc_run_begin(q)) {
+ if (unlikely(contended)) {
+ spin_unlock(&q->busylock);
+ contended = false;
+ }
+ __qdisc_run(q);
+ }
}
spin_unlock(root_lock);
-
+ if (unlikely(contended))
+ spin_unlock(&q->busylock);
return rc;
}
static inline int skb_needs_linearize(struct sk_buff *skb,
struct net_device *dev)
{
- return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
- (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
- illegal_highdma(dev, skb)));
+ return skb_is_nonlinear(skb) &&
+ ((skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
+ (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
+ illegal_highdma(dev, skb))));
}
/**
return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
}
-#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
-
-#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
+#if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
+ (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
/* This hook is defined here for ATM LANE */
int (*br_fdb_test_addr_hook)(struct net_device *dev,
unsigned char *addr) __read_mostly;
EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
#endif
-/*
- * If bridge module is loaded call bridging hook.
- * returns NULL if packet was consumed.
- */
-struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
- struct sk_buff *skb) __read_mostly;
-EXPORT_SYMBOL_GPL(br_handle_frame_hook);
-
-static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
- struct packet_type **pt_prev, int *ret,
- struct net_device *orig_dev)
-{
- struct net_bridge_port *port;
-
- if (skb->pkt_type == PACKET_LOOPBACK ||
- (port = rcu_dereference(skb->dev->br_port)) == NULL)
- return skb;
-
- if (*pt_prev) {
- *ret = deliver_skb(skb, *pt_prev, orig_dev);
- *pt_prev = NULL;
- }
-
- return br_handle_frame_hook(port, skb);
-}
-#else
-#define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
-#endif
-
-#if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
-struct sk_buff *(*macvlan_handle_frame_hook)(struct macvlan_port *p,
- struct sk_buff *skb) __read_mostly;
-EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
-
-static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
- struct packet_type **pt_prev,
- int *ret,
- struct net_device *orig_dev)
-{
- struct macvlan_port *port;
-
- port = rcu_dereference(skb->dev->macvlan_port);
- if (!port)
- return skb;
-
- if (*pt_prev) {
- *ret = deliver_skb(skb, *pt_prev, orig_dev);
- *pt_prev = NULL;
- }
- return macvlan_handle_frame_hook(port, skb);
-}
-#else
-#define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
-#endif
-
#ifdef CONFIG_NET_CLS_ACT
/* TODO: Maybe we should just force sch_ingress to be compiled in
* when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
if (*pt_prev) {
*ret = deliver_skb(skb, *pt_prev, orig_dev);
*pt_prev = NULL;
- } else {
- /* Huh? Why does turning on AF_PACKET affect this? */
- skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
}
switch (ing_filter(skb)) {
rcu_read_unlock();
}
+/**
+ * netdev_rx_handler_register - register receive handler
+ * @dev: device to register a handler for
+ * @rx_handler: receive handler to register
+ *
+ * Register a receive hander for a device. This handler will then be
+ * called from __netif_receive_skb. A negative errno code is returned
+ * on a failure.
+ *
+ * The caller must hold the rtnl_mutex.
+ */
+int netdev_rx_handler_register(struct net_device *dev,
+ rx_handler_func_t *rx_handler)
+{
+ ASSERT_RTNL();
+
+ if (dev->rx_handler)
+ return -EBUSY;
+
+ rcu_assign_pointer(dev->rx_handler, rx_handler);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
+
+/**
+ * netdev_rx_handler_unregister - unregister receive handler
+ * @dev: device to unregister a handler from
+ *
+ * Unregister a receive hander from a device.
+ *
+ * The caller must hold the rtnl_mutex.
+ */
+void netdev_rx_handler_unregister(struct net_device *dev)
+{
+
+ ASSERT_RTNL();
+ rcu_assign_pointer(dev->rx_handler, NULL);
+}
+EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
+
static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
struct net_device *master)
{
static int __netif_receive_skb(struct sk_buff *skb)
{
struct packet_type *ptype, *pt_prev;
+ rx_handler_func_t *rx_handler;
struct net_device *orig_dev;
struct net_device *master;
struct net_device *null_or_orig;
skb->dev = master;
}
- __get_cpu_var(softnet_data).processed++;
-
+ __this_cpu_inc(softnet_data.processed);
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
skb->mac_len = skb->network_header - skb->mac_header;
ncls:
#endif
- skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
- if (!skb)
- goto out;
- skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
- if (!skb)
- goto out;
+ /* Handle special case of bridge or macvlan */
+ rx_handler = rcu_dereference(skb->dev->rx_handler);
+ if (rx_handler) {
+ if (pt_prev) {
+ ret = deliver_skb(skb, pt_prev, orig_dev);
+ pt_prev = NULL;
+ }
+ skb = rx_handler(skb);
+ if (!skb)
+ goto out;
+ }
/*
* Make sure frames received on VLAN interfaces stacked on
projects / lisovros / linux_canprio.git / blobdiff