@@ -2456,6 +2456,7 @@ static inline int dev_recursion_level(void)
struct net_device *dev_get_by_index(struct net *net, int ifindex);
struct net_device *__dev_get_by_index(struct net *net, int ifindex);
struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
+struct net_device *dev_get_by_napi_id(unsigned int napi_id);
int netdev_get_name(struct net *net, char *name, int ifindex);
int dev_restart(struct net_device *dev);
int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb);
@@ -915,6 +915,15 @@ static inline bool skb_pkt_type_ok(u32 ptype)
return ptype <= PACKET_OTHERHOST;
}
+static inline unsigned int skb_napi_id(const struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ return skb->napi_id;
+#else
+ return 0;
+#endif
+}
+
void kfree_skb(struct sk_buff *skb);
void kfree_skb_list(struct sk_buff *segs);
void skb_tx_error(struct sk_buff *skb);
@@ -161,6 +161,7 @@ static int netif_rx_internal(struct sk_buff *skb);
static int call_netdevice_notifiers_info(unsigned long val,
struct net_device *dev,
struct netdev_notifier_info *info);
+static struct napi_struct *napi_by_id(unsigned int napi_id);
/*
* The @dev_base_head list is protected by @dev_base_lock and the rtnl
@@ -865,6 +866,31 @@ struct net_device *dev_get_by_index(struct net *net, int ifindex)
EXPORT_SYMBOL(dev_get_by_index);
/**
+ * dev_get_by_napi_id - find a device by napi_id
+ * @napi_id: ID of the NAPI struct
+ *
+ * Search for an interface by NAPI ID. Returns %NULL if the device
+ * is not found or a pointer to the device. The device has not had
+ * its reference counter increased so the caller must be careful
+ * about locking. The caller must hold RCU lock.
+ */
+
+struct net_device *dev_get_by_napi_id(unsigned int napi_id)
+{
+ struct napi_struct *napi;
+
+ WARN_ON_ONCE(!rcu_read_lock_held());
+
+ if (napi_id < MIN_NAPI_ID)
+ return NULL;
+
+ napi = napi_by_id(napi_id);
+
+ return napi ? napi->dev : NULL;
+}
+EXPORT_SYMBOL(dev_get_by_napi_id);
+
+/**
* netdev_get_name - get a netdevice name, knowing its ifindex.
* @net: network namespace
* @name: a pointer to the buffer where the name will be stored.
Since commit b68581778cd0 ("net: Make skb->skb_iif always track skb->dev") skbs don't have the original index of the interface which received the packet. This information is now needed for a new control message related to hardware timestamping. Instead of adding a new field to skb, we can find the device by the NAPI ID if it is available, i.e. CONFIG_NET_RX_BUSY_POLL is enabled and the driver is using NAPI. Add dev_get_by_napi_id() and also skb_napi_id() to hide the CONFIG_NET_RX_BUSY_POLL ifdef. CC: Richard Cochran <richardcochran@gmail.com> CC: Willem de Bruijn <willemb@google.com> Suggested-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com> --- include/linux/netdevice.h | 1 + include/linux/skbuff.h | 9 +++++++++ net/core/dev.c | 26 ++++++++++++++++++++++++++ 3 files changed, 36 insertions(+)