netdev - [PATCH net-next v6 0/3] net: tcp: un-pin tw timer

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Message-ID: <20240603093625.4055-1-fw@strlen.de>
Date: Mon,  3 Jun 2024 11:36:09 +0200
From: Florian Westphal <fw@...len.de>
To: <netdev@...r.kernel.org>
Cc: Paolo Abeni <pabeni@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	mleitner@...hat.com,
	juri.lelli@...hat.com,
	vschneid@...hat.com,
	tglozar@...hat.com,
	dsahern@...nel.org,
	bigeasy@...utronix.de,
	tglx@...utronix.de
Subject: [PATCH net-next v6 0/3] net: tcp: un-pin tw timer

This is v6 of the series where the tw_timer is un-pinned to get rid of
interferences in isolated CPUs setups.

First patch makes necessary preparations, existing code relies on
TIMER_PINNED to avoid races.

Second patch un-pins the TW timer. Could be folded into the first one,
but it might help wrt. bisection.

Third patch is a minor cleanup to move a helper from .h to the only
remaining compilation unit.

Tested with iperf3 and stress-ng socket mode.

Changes since previous iteration:
 - do not use work queues, keep timers as-is
 - use timer_shutdown (can't wait for timer with spinlock held)
 - keep existing tw sk refcount (3)

Florian Westphal (2):
  net: tcp: un-pin the tw_timer
  tcp: move inet_twsk_schedule helper out of header

Valentin Schneider (1):
  net: tcp/dcpp: prepare for tw_timer un-pinning

 include/net/inet_timewait_sock.h | 11 ++---
 net/dccp/minisocks.c             |  3 +-
 net/ipv4/inet_timewait_sock.c    | 81 +++++++++++++++++++++++++++-----
 net/ipv4/tcp_minisocks.c         |  3 +-
 4 files changed, 74 insertions(+), 24 deletions(-)

-- 
2.44.2