/* All public tunnel flags. */
#define TNL_F_PUBLIC (TNL_F_CSUM | TNL_F_TOS_INHERIT | TNL_F_TTL_INHERIT | \
TNL_F_DF_INHERIT | TNL_F_DF_DEFAULT | TNL_F_PMTUD | \
- TNL_F_HDR_CACHE | TNL_F_IPSEC)
+ TNL_F_IPSEC)
/**
* struct port_lookup_key - Tunnel port key, used as hash table key.
*/
int (*hdr_len)(const struct tnl_mutable_config *,
const struct ovs_key_ipv4_tunnel *);
-
/*
- * Builds the static portion of the tunnel header, which is stored in
- * the header cache. In general the performance of this function is
- * not too important as we try to only call it when building the cache
- * so it is preferable to shift as much work as possible here. However,
- * in some circumstances caching is disabled and this function will be
- * called for every packet, so try not to make it too slow.
+ * Returns a linked list of SKBs with tunnel headers (multiple
+ * packets may be generated in the event of fragmentation). Space
+ * will have already been allocated at the start of the packet equal
+ * to sizeof(struct iphdr) + value returned by hdr_len(). The IP
+ * header will have already been constructed.
*/
- void (*build_header)(const struct vport *,
- const struct tnl_mutable_config *,
- const struct ovs_key_ipv4_tunnel *, void *header);
-
- /*
- * Updates the cached header of a packet to match the actual packet
- * data. Typical things that might need to be updated are length,
- * checksum, etc. The IP header will have already been updated and this
- * is the final step before transmission. Returns a linked list of
- * completed SKBs (multiple packets may be generated in the event
- * of fragmentation).
- */
- struct sk_buff *(*update_header)(const struct vport *,
+ struct sk_buff *(*build_header)(const struct vport *,
const struct tnl_mutable_config *,
struct dst_entry *, struct sk_buff *,
int tunnel_hlen);
};
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
-/*
- * On these kernels we have a fast mechanism to tell if the ARP cache for a
- * particular destination has changed.
- */
-#define HAVE_HH_SEQ
-#endif
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27)
-/*
- * On these kernels we have a fast mechanism to tell if the routing table
- * has changed.
- */
-#define HAVE_RT_GENID
-#endif
-#if !defined(HAVE_HH_SEQ) || !defined(HAVE_RT_GENID)
-/* If we can't detect all system changes directly we need to use a timeout. */
-#define NEED_CACHE_TIMEOUT
-#endif
-struct tnl_cache {
- struct rcu_head rcu;
-
- int len; /* Length of data to be memcpy'd from cache. */
- int hh_len; /* Hardware hdr length, cached from hh_cache. */
-
- /* Sequence number of mutable->seq from which this cache was
- * generated. */
- unsigned mutable_seq;
-
-#ifdef HAVE_HH_SEQ
- /*
- * The sequence number from the seqlock protecting the hardware header
- * cache (in the ARP cache). Since every write increments the counter
- * this gives us an easy way to tell if it has changed.
- */
- unsigned hh_seq;
-#endif
-
-#ifdef NEED_CACHE_TIMEOUT
- /*
- * If we don't have direct mechanisms to detect all important changes in
- * the system fall back to an expiration time. This expiration time
- * can be relatively short since at high rates there will be millions of
- * packets per second, so we'll still get plenty of benefit from the
- * cache. Note that if something changes we may blackhole packets
- * until the expiration time (depending on what changed and the kernel
- * version we may be able to detect the change sooner). Expiration is
- * expressed as a time in jiffies.
- */
- unsigned long expiration;
-#endif
-
- /*
- * The routing table entry that is the result of looking up the tunnel
- * endpoints. It also contains a sequence number (called a generation
- * ID) that can be compared to a global sequence to tell if the routing
- * table has changed (and therefore there is a potential that this
- * cached route has been invalidated).
- */
- struct rtable *rt;
-
- /*
- * If the output device for tunnel traffic is an OVS internal device,
- * the flow of that datapath. Since all tunnel traffic will have the
- * same headers this allows us to cache the flow lookup. NULL if the
- * output device is not OVS or if there is no flow installed.
- */
- struct sw_flow *flow;
-
- /* The cached header follows after padding for alignment. */
-};
-
struct tnl_vport {
struct rcu_head rcu;
struct hlist_node hash_node;
* this is not needed.
*/
atomic_t frag_id;
-
- spinlock_t cache_lock;
- struct tnl_cache __rcu *cache; /* Protected by RCU/cache_lock. */
-
-#ifdef NEED_CACHE_TIMEOUT
- /*
- * If we must rely on expiration time to invalidate the cache, this is
- * the interval. It is randomized within a range (defined by
- * MAX_CACHE_EXP in tunnel.c) to avoid synchronized expirations caused
- * by creation of a large number of tunnels at a one time.
- */
- unsigned long cache_exp_interval;
-#endif
};
struct vport *ovs_tnl_create(const struct vport_parms *, const struct vport_ops *,
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