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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ovs-dev-bounces@openvswitch.org","Sender":"\"dev\" "},"content":"When RTNL is contended, network-related control-plane operations can be\ndelayed.\n\nIn such scenario, if OVS control-plane operations (such as vport\ncreation) take a bit longer, it's acceptable. However, flow installation\noperations happen as part of upcall processing, executed in the context\nof of handler threads. If they get delayed, it affects the data-plane\nand can even result in packet drops.\n\nBecause flow operations also use ovs_mutex for concurrency protection and\ngiven RTNL can nest under ovs_mutex, contention can be easily transferred\nfrom RTNL to ovs_mutex, causing delay in flow operations.\n\nIn order to protect flow operations from RTNL delays, this series\ndecouples them from ovs_mutex. First, the flow_table is converted into an\nrcu-protected pointer. Then two locking mechanisms are introduced: a\nper-table mutex and a refcount.\n\nThe mutex protects the flow_table against concurrent modifications,\nwhile the refcount is used to extend the lifetime of the flow_table\nbeyond the rcu read-protected region used to dereference it.\n\nv3:\n- Split in 2 patches (Paolo)\n- Improve locking in get_dp_stats (Paolo and Sashiko)\n- Use __always_unused in lockdep stubs (Paolo)\n- Use READ_ONCE/WRITE_ONCE for table->count (Aaron)\n- Take a reference in ovs_dp_masks_rebalance (Aaron) \n\nv2: Fix argument in ovs_flow_tbl_put (sparse)\n Remove rcu checks in ovs_dp_masks_rebalance\n\nAdrian Moreno (2):\n net: openvswitch: make flow_table an rcu pointer\n net: openvswitch: decouple flow_table from ovs_mutex\n\n net/openvswitch/datapath.c | 293 ++++++++++++++++++++++++-----------\n net/openvswitch/datapath.h | 2 +-\n net/openvswitch/flow.c | 13 +-\n net/openvswitch/flow.h | 9 +-\n net/openvswitch/flow_table.c | 194 ++++++++++++++---------\n net/openvswitch/flow_table.h | 56 ++++++-\n 6 files changed, 396 insertions(+), 171 deletions(-)"}