udp: no longer use SLAB_DESTROY_BY_RCU
Tom Herbert would like not touching UDP socket refcnt for encapsulated
traffic. For this to happen, we need to use normal RCU rules, with a grace
period before freeing a socket. UDP sockets are not short lived in the
high usage case, so the added cost of call_rcu() should not be a concern.
This actually removes a lot of complexity in UDP stack.
Multicast receives no longer need to hold a bucket spinlock.
Note that ip early demux still needs to take a reference on the socket.
Same remark for functions used by xt_socket and xt_PROXY netfilter modules,
but this might be changed later.
Performance for a single UDP socket receiving flood traffic from
many RX queues/cpus.
Simple udp_rx using simple recvfrom() loop :
438 kpps instead of 374 kpps : 17 % increase of the peak rate.
v2: Addressed Willem de Bruijn feedback in multicast handling
- keep early demux break in __udp4_lib_demux_lookup()
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tom Herbert <tom@herbertland.com>
Cc: Willem de Bruijn <willemb@google.com>
Tested-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/sock.h b/include/net/sock.h
index 9e77353..7ad73db 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -178,7 +178,7 @@
int skc_bound_dev_if;
union {
struct hlist_node skc_bind_node;
- struct hlist_nulls_node skc_portaddr_node;
+ struct hlist_node skc_portaddr_node;
};
struct proto *skc_prot;
possible_net_t skc_net;
@@ -670,18 +670,18 @@
hlist_for_each_entry(__sk, list, sk_bind_node)
/**
- * sk_nulls_for_each_entry_offset - iterate over a list at a given struct offset
+ * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset
* @tpos: the type * to use as a loop cursor.
* @pos: the &struct hlist_node to use as a loop cursor.
* @head: the head for your list.
* @offset: offset of hlist_node within the struct.
*
*/
-#define sk_nulls_for_each_entry_offset(tpos, pos, head, offset) \
- for (pos = (head)->first; \
- (!is_a_nulls(pos)) && \
+#define sk_for_each_entry_offset_rcu(tpos, pos, head, offset) \
+ for (pos = rcu_dereference((head)->first); \
+ pos != NULL && \
({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;}); \
- pos = pos->next)
+ pos = rcu_dereference(pos->next))
static inline struct user_namespace *sk_user_ns(struct sock *sk)
{