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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , mleitner@redhat.com, David Ahern , Juri Lelli , Tomas Glozar , Sebastian Andrzej Siewior , Thomas Gleixner Subject: [PATCH v5 1/2] SQUASH: tcp/dcpp: Convert timewait timer into a delayed_work Date: Mon, 15 Apr 2024 13:34:35 +0200 Message-ID: <20240415113436.3261042-2-vschneid@redhat.com> In-Reply-To: <20240415113436.3261042-1-vschneid@redhat.com> References: <20240415113436.3261042-1-vschneid@redhat.com> Precedence: bulk X-Mailing-List: linux-rt-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.7 !NOTE! this changes behaviour, as the tw_timer is TIMER_PINNED and delayed works currently cannot behave as such. TIMER_PINNED timers are enqueued onto the local base, whereas delayed_works have their timer enqueued on the global base AND also check for HK_TYPE_TIMER isolation. The split between this commit and the next is mainly there for ease of reviewing. This commit should be squashed with the next one. Signed-off-by: Valentin Schneider --- include/net/inet_timewait_sock.h | 2 +- net/ipv4/inet_diag.c | 2 +- net/ipv4/inet_timewait_sock.c | 16 +++++++++------- net/ipv4/tcp_ipv4.c | 2 +- net/ipv6/tcp_ipv6.c | 2 +- .../testing/selftests/bpf/progs/bpf_iter_tcp4.c | 2 +- .../testing/selftests/bpf/progs/bpf_iter_tcp6.c | 2 +- 7 files changed, 15 insertions(+), 13 deletions(-) diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h index f28da08a37b4e..c4d64f1f8d415 100644 --- a/include/net/inet_timewait_sock.h +++ b/include/net/inet_timewait_sock.h @@ -72,7 +72,7 @@ struct inet_timewait_sock { tw_tos : 8; u32 tw_txhash; u32 tw_priority; - struct timer_list tw_timer; + struct delayed_work tw_expiry_work; struct inet_bind_bucket *tw_tb; struct inet_bind2_bucket *tw_tb2; }; diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c index 7adace541fe29..ab11b688f1eeb 100644 --- a/net/ipv4/inet_diag.c +++ b/net/ipv4/inet_diag.c @@ -444,7 +444,7 @@ static int inet_twsk_diag_fill(struct sock *sk, r->idiag_state = tw->tw_substate; r->idiag_timer = 3; - tmo = tw->tw_timer.expires - jiffies; + tmo = tw->tw_expiry_work.timer.expires - jiffies; r->idiag_expires = jiffies_delta_to_msecs(tmo); r->idiag_rqueue = 0; r->idiag_wqueue = 0; diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c index e8de45d34d56a..7a2dcbaa1a61e 100644 --- a/net/ipv4/inet_timewait_sock.c +++ b/net/ipv4/inet_timewait_sock.c @@ -150,11 +150,13 @@ void inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, } EXPORT_SYMBOL_GPL(inet_twsk_hashdance); -static void tw_timer_handler(struct timer_list *t) +static void tw_expiry_workfn(struct work_struct *work) { - struct inet_timewait_sock *tw = from_timer(tw, t, tw_timer); - + struct inet_timewait_sock *tw = container_of( + work, struct inet_timewait_sock, tw_expiry_work.work); + local_bh_disable(); inet_twsk_kill(tw); + local_bh_enable(); } struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, @@ -192,7 +194,7 @@ struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, tw->tw_prot = sk->sk_prot_creator; atomic64_set(&tw->tw_cookie, atomic64_read(&sk->sk_cookie)); twsk_net_set(tw, sock_net(sk)); - timer_setup(&tw->tw_timer, tw_timer_handler, TIMER_PINNED); + INIT_DELAYED_WORK(&tw->tw_expiry_work, tw_expiry_workfn); /* * Because we use RCU lookups, we should not set tw_refcnt * to a non null value before everything is setup for this @@ -217,7 +219,7 @@ EXPORT_SYMBOL_GPL(inet_twsk_alloc); */ void inet_twsk_deschedule_put(struct inet_timewait_sock *tw) { - if (del_timer_sync(&tw->tw_timer)) + if (cancel_delayed_work_sync(&tw->tw_expiry_work)) inet_twsk_kill(tw); inet_twsk_put(tw); } @@ -255,10 +257,10 @@ void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, bool rearm) __NET_INC_STATS(twsk_net(tw), kill ? LINUX_MIB_TIMEWAITKILLED : LINUX_MIB_TIMEWAITED); - BUG_ON(mod_timer(&tw->tw_timer, jiffies + timeo)); + BUG_ON(!queue_delayed_work(system_unbound_wq, &tw->tw_expiry_work, timeo)); refcount_inc(&tw->tw_dr->tw_refcount); } else { - mod_timer_pending(&tw->tw_timer, jiffies + timeo); + mod_delayed_work(system_unbound_wq, &tw->tw_expiry_work, timeo); } } EXPORT_SYMBOL_GPL(__inet_twsk_schedule); diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index a22ee58387518..4b106f017a81f 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2920,7 +2920,7 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i) static void get_timewait4_sock(const struct inet_timewait_sock *tw, struct seq_file *f, int i) { - long delta = tw->tw_timer.expires - jiffies; + long delta = tw->tw_expiry_work.timer.expires - jiffies; __be32 dest, src; __u16 destp, srcp; diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 3f4cba49e9ee6..58cd12fdc91a5 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -2242,7 +2242,7 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) static void get_timewait6_sock(struct seq_file *seq, struct inet_timewait_sock *tw, int i) { - long delta = tw->tw_timer.expires - jiffies; + long delta = tw->tw_expiry_work.timer.expires - jiffies; const struct in6_addr *dest, *src; __u16 destp, srcp; diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_tcp4.c b/tools/testing/selftests/bpf/progs/bpf_iter_tcp4.c index 92267abb462fc..a429f4eb9939c 100644 --- a/tools/testing/selftests/bpf/progs/bpf_iter_tcp4.c +++ b/tools/testing/selftests/bpf/progs/bpf_iter_tcp4.c @@ -152,7 +152,7 @@ static int dump_tw_sock(struct seq_file *seq, struct tcp_timewait_sock *ttw, __be32 dest, src; long delta; - delta = tw->tw_timer.expires - bpf_jiffies64(); + delta = tw->tw_expiry_work.timer.expires - bpf_jiffies64(); dest = tw->tw_daddr; src = tw->tw_rcv_saddr; destp = bpf_ntohs(tw->tw_dport); diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_tcp6.c b/tools/testing/selftests/bpf/progs/bpf_iter_tcp6.c index 943f7bba180e7..795bb34c95f72 100644 --- a/tools/testing/selftests/bpf/progs/bpf_iter_tcp6.c +++ b/tools/testing/selftests/bpf/progs/bpf_iter_tcp6.c @@ -157,7 +157,7 @@ static int dump_tw_sock(struct seq_file *seq, struct tcp_timewait_sock *ttw, __u16 destp, srcp; long delta; - delta = tw->tw_timer.expires - bpf_jiffies64(); + delta = tw->tw_expiry_work.timer.expires - bpf_jiffies64(); dest = &tw->tw_v6_daddr; src = &tw->tw_v6_rcv_saddr; destp = bpf_ntohs(tw->tw_dport);