Tom Parkin 07b8ca3792 net/l2tp: convert tunnel rwlock_t to rcu ... Previously commit e02d494d2c ("l2tp: Convert rwlock to RCU") converted most, but not all, rwlock instances in the l2tp subsystem to RCU. The remaining rwlock protects the per-tunnel hashlist of sessions which is used for session lookups in the UDP-encap data path. Convert the remaining rwlock to rcu to improve performance of UDP-encap tunnels. Note that the tunnel and session, which both live on RCU-protected lists, use slightly different approaches to incrementing their refcounts in the various getter functions. The tunnel has to use refcount_inc_not_zero because the tunnel shutdown process involves dropping the refcount to zero prior to synchronizing RCU readers (via. kfree_rcu). By contrast, the session shutdown removes the session from the list(s) it is on, synchronizes with readers, and then decrements the session refcount. Since the getter functions increment the session refcount with the RCU read lock held we prevent getters seeing a zero session refcount, and therefore don't need to use refcount_inc_not_zero. Signed-off-by: Tom Parkin <tparkin@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2021-11-29 12:11:25 +00:00
..
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
l2tp_core.c	net/l2tp: convert tunnel rwlock_t to rcu	2021-11-29 12:11:25 +00:00
l2tp_core.h	net/l2tp: convert tunnel rwlock_t to rcu	2021-11-29 12:11:25 +00:00
l2tp_debugfs.c	net/l2tp: convert tunnel rwlock_t to rcu	2021-11-29 12:11:25 +00:00
l2tp_eth.c	l2tp: remove header length param from l2tp_xmit_skb	2020-09-03 12:19:03 -07:00
l2tp_ip6.c	lsm,selinux: pass flowi_common instead of flowi to the LSM hooks	2020-11-23 18:36:21 -05:00
l2tp_ip.c	l2tp: Fix spelling mistakes	2021-06-07 14:08:30 -07:00
l2tp_netlink.c	net: l2tp: reduce log level of messages in receive path, add counter instead	2021-03-03 16:55:02 -08:00
l2tp_ppp.c	l2tp: Fix spelling mistakes	2021-06-07 14:08:30 -07:00
Makefile	l2tp: add tracepoint infrastructure to core	2020-08-22 12:44:37 -07:00
trace.h	l2tp: add tracepoint definitions in trace.h	2020-08-22 12:44:37 -07:00