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62c07983be
linux/net
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Eric Dumazet 62c07983be once: add DO_ONCE_SLOW() for sleepable contexts 
Christophe Leroy reported a ~80ms latency spike
happening at first TCP connect() time.

This is because __inet_hash_connect() uses get_random_once()
to populate a perturbation table which became quite big
after commit 4c2c8f03a5 ("tcp: increase source port perturb table to 2^16")

get_random_once() uses DO_ONCE(), which block hard irqs for the duration
of the operation.

This patch adds DO_ONCE_SLOW() which uses a mutex instead of a spinlock
for operations where we prefer to stay in process context.

Then __inet_hash_connect() can use get_random_slow_once()
to populate its perturbation table.

Fixes: 4c2c8f03a5 ("tcp: increase source port perturb table to 2^16")
Fixes: 190cc82489 ("tcp: change source port randomizarion at connect() time")
Reported-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/netdev/CANn89iLAEYBaoYajy0Y9UmGFff5GPxDUoG-ErVB2jDdRNQ5Tug@mail.gmail.com/T/#t
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willy Tarreau <w@1wt.eu>
Tested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-10-03 13:29:11 +01:00
..
6lowpan
9p iov_iter stuff, part 2, rebased 2022-08-08 20:04:35 -07:00
802
8021q net: gro: skb_gro_header helper function 2022-08-25 10:33:21 +02:00
appletalk
atm
ax25 ax25: move from strlcpy with unused retval to strscpy 2022-08-22 17:55:50 -07:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-09-22 13:02:10 -07:00
bluetooth Bluetooth: hci_sync: Fix not indicating power state 2022-09-30 17:32:12 -07:00
bpf bpf, test_run: Propagate bpf_flow_dissect's retval to user's bpf_attr.test.retval 2022-08-23 22:48:03 +02:00
bpfilter
bridge net: bridge: assign path_cost for 2.5G and 5G link speed 2022-09-30 12:35:29 +01:00
caif caif: move from strlcpy with unused retval to strscpy 2022-08-22 17:57:35 -07:00
can can: bcm: check the result of can_send() in bcm_can_tx() 2022-09-23 13:53:10 +02:00
ceph libceph: clean up ceph_osdc_start_request prototype 2022-08-03 14:05:39 +02:00
core gro: add support of (hw)gro packets to gro stack 2022-10-03 12:38:34 +01:00
dcb
dccp tcp: Introduce optional per-netns ehash. 2022-09-20 10:21:50 -07:00
dns_resolver
dsa net: dsa: remove bool devlink_port_setup 2022-09-30 18:17:17 -07:00
ethernet net: gro: skb_gro_header helper function 2022-08-25 10:33:21 +02:00
ethtool net: phy: Add support for rate matching 2022-09-23 11:55:35 +01:00
hsr genetlink: start to validate reserved header bytes 2022-08-29 12:47:15 +01:00
ieee802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-09-22 13:02:10 -07:00
ife
ipv4 once: add DO_ONCE_SLOW() for sleepable contexts 2022-10-03 13:29:11 +01:00
ipv6 net: Add helper function to parse netlink msg of ip_tunnel_parm 2022-10-03 07:59:06 +01:00
iucv
kcm kcm: fix strp_init() order and cleanup 2022-08-31 12:16:44 -07:00
key Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec 2022-08-24 12:51:50 +01:00
l2tp genetlink: start to validate reserved header bytes 2022-08-29 12:47:15 +01:00
l3mdev
lapb
llc
mac80211 wireless-next patches for v6.1 2022-09-30 10:07:31 -07:00
mac802154 net: mac802154: Fix a condition in the receive path 2022-08-29 11:10:22 +02:00
mctp
mpls net: Use u64_stats_fetch_begin_irq() for stats fetch. 2022-08-29 13:02:27 +01:00
mptcp mptcp: update misleading comments. 2022-10-03 11:18:53 +01:00
ncsi genetlink: start to validate reserved header bytes 2022-08-29 12:47:15 +01:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-09-22 13:02:10 -07:00
netlabel genetlink: start to validate reserved header bytes 2022-08-29 12:47:15 +01:00
netlink genetlink: reject use of nlmsg_flags for new commands 2022-09-30 17:43:09 -07:00
netrom
nfc NFC: hci: Split memcpy() of struct hcp_message flexible array 2022-09-27 07:45:18 -07:00
nsh
openvswitch net: openvswitch: allow conntrack in non-initial user namespace 2022-09-27 11:31:36 +02:00
packet net/af_packet: registration process optimization in packet_init() 2022-09-21 12:59:22 +01:00
phonet
psample genetlink: start to validate reserved header bytes 2022-08-29 12:47:15 +01:00
qrtr net: qrtr: start MHI channel after endpoit creation 2022-08-15 11:21:42 +01:00
rds net: rds: add missing __init/__exit annotations to module init/exit funcs 2022-09-19 17:58:53 -07:00
rfkill
rose rose: check NULL rose_loopback_neigh->loopback 2022-08-22 14:24:54 +01:00
rxrpc rxrpc: remove rxrpc_max_call_lifetime declaration 2022-09-19 17:58:47 -07:00
sched net: sched: use tc_cls_bind_class() in filter 2022-10-02 16:07:17 +01:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-07-28 18:21:16 -07:00
smc net/smc: Support SO_REUSEPORT 2022-09-27 10:26:17 +02:00
strparser strparser: pad sk_skb_cb to avoid straddling cachelines 2022-07-08 18:38:44 -07:00
sunrpc NFS client bugfixes for Linux 6.0 2022-09-12 17:53:46 -04:00
switchdev
tipc net/tipc: Remove unused struct distr_queue_item 2022-09-29 18:48:32 -07:00
tls net: tls: Add ARIA-GCM algorithm 2022-09-27 17:29:09 -07:00
unix af_unix: Refactor unix_read_skb() 2022-09-26 11:00:19 -07:00
vmw_vsock vsock/vmci: fix repeated words in comments 2022-09-16 09:31:29 +01:00
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-09-29 14:30:51 -07:00
x25 net/x25: fix call timeouts in blocking connects 2022-08-08 20:48:51 -07:00
xdp xsk: Expose min chunk size to drivers 2022-09-30 07:55:45 -07:00
xfrm Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2022-10-03 07:52:13 +01:00
compat.c net: clear msg_get_inq in __get_compat_msghdr() 2022-09-20 08:23:20 -07:00
devres.c
Kconfig Remove DECnet support from kernel 2022-08-22 14:26:30 +01:00
Kconfig.debug net: make NET_(DEV|NS)_REFCNT_TRACKER depend on NET 2022-09-20 14:23:56 -07:00
Makefile Remove DECnet support from kernel 2022-08-22 14:26:30 +01:00
socket.c net: Fix a data-race around sysctl_somaxconn. 2022-08-24 13:46:58 +01:00
sysctl_net.c