Netlink sockets are maintained in a hash table to allow efficient lookup via the port ID for unicast messages. However, lookups currently require a read lock to be taken. This series adds a new generic, resizable, scalable, concurrent hash table based on the paper referenced in the first patch. It then makes use of the new data type to implement lockless netlink_lookup(). Patch 3/3 to convert nft_hash is included for reference but should be merged via the netfilter tree. Inclusion in this series is to provide context for the suggested API. Against net-next since the initial user of the new hash table is in net/ Changes: v1-v2: - fixed traversal off-by-one as spotted by Tobias Klauser - removed unlikely() from BUG_ON() as spotted by Josh Triplett - new 3rd patch to convert nft_hash to rhashtable - make rhashtable_insert() return void - nl_sk_hash_lock must be a mutex - fixed wrong name of rht_shrink_below_30() - exported symbols rht_grow_above_75() and rht_shrink_below_30() - allow table freeing with RCU callback Thomas Graf (3): lib: Resizable, Scalable, Concurrent Hash Table netlink: Convert netlink_lookup() to use RCU protected hash table nftables: Convert nft_hash to use generic rhashtable include/linux/rhashtable.h | 213 ++++++++++++ lib/Kconfig.debug | 8 + lib/Makefile | 2 +- lib/rhashtable.c | 797 +++++++++++++++++++++++++++++++++++++++++++++ net/netfilter/nft_hash.c | 291 +++-------------- net/netlink/af_netlink.c | 285 ++++++---------- net/netlink/af_netlink.h | 18 +- net/netlink/diag.c | 11 +- 8 files changed, 1190 insertions(+), 435 deletions(-) create mode 100644 include/linux/rhashtable.h create mode 100644 lib/rhashtable.c -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
