Martin KaFai Lau cae3873c5b net: inet: Retire port only listening_hash ... The listen sk is currently stored in two hash tables, listening_hash (hashed by port) and lhash2 (hashed by port and address). After commit 0ee58dad5b ("net: tcp6: prefer listeners bound to an address") and commit d9fbc7f643 ("net: tcp: prefer listeners bound to an address"), the TCP-SYN lookup fast path does not use listening_hash. The commit 05c0b35709 ("tcp: seq_file: Replace listening_hash with lhash2") also moved the seq_file (/proc/net/tcp) iteration usage from listening_hash to lhash2. There are still a few listening_hash usages left. One of them is inet_reuseport_add_sock() which uses the listening_hash to search a listen sk during the listen() system call. This turns out to be very slow on use cases that listen on many different VIPs at a popular port (e.g. 443). [ On top of the slowness in adding to the tail in the IPv6 case ]. The latter patch has a selftest to demonstrate this case. This patch takes this chance to move all remaining listening_hash usages to lhash2 and then retire listening_hash. Since most changes need to be done together, it is hard to cut the listening_hash to lhash2 switch into small patches. The changes in this patch is highlighted here for the review purpose. 1. Because of the listening_hash removal, lhash2 can use the sk->sk_nulls_node instead of the icsk->icsk_listen_portaddr_node. This will also keep the sk_unhashed() check to work as is after stop adding sk to listening_hash. The union is removed from inet_listen_hashbucket because only nulls_head is needed. 2. icsk->icsk_listen_portaddr_node and its helpers are removed. 3. The current lhash2 users needs to iterate with sk_nulls_node instead of icsk_listen_portaddr_node. One case is in the inet[6]_lhash2_lookup(). Another case is the seq_file iterator in tcp_ipv4.c. One thing to note is sk_nulls_next() is needed because the old inet_lhash2_for_each_icsk_continue() does a "next" first before iterating. 4. Move the remaining listening_hash usage to lhash2 inet_reuseport_add_sock() which this series is trying to improve. inet_diag.c and mptcp_diag.c are the final two remaining use cases and is moved to lhash2 now also. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2022-05-12 16:52:18 -07:00
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ccids	…
Kconfig	…
Makefile	…
ackvec.c	…
ackvec.h	…
ccid.c	…
ccid.h	…
dccp.h	net: remove noblock parameter from recvmsg() entities	2022-04-12 15:00:25 +02:00
diag.c	…
feat.c	…
feat.h	…
input.c	…
ipv4.c	ipv4: Avoid using RTO_ONLINK with ip_route_connect().	2022-04-22 13:06:03 +01:00
ipv6.c	ipv6: Remove __ipv6_only_sock().	2022-04-22 12:47:50 +01:00
ipv6.h	…
minisocks.c	tcp: allocate tcp_death_row outside of struct netns_ipv4	2022-01-26 19:00:31 -08:00
options.c	…
output.c	…
proto.c	net: inet: Retire port only listening_hash	2022-05-12 16:52:18 -07:00
qpolicy.c	…
sysctl.c	…
timer.c	…
trace.h	…