From patchwork Mon Mar 17 15:14:01 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Dumazet X-Patchwork-Id: 14019429 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-qt1-f201.google.com (mail-qt1-f201.google.com [209.85.160.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8071322CBE3 for ; Mon, 17 Mar 2025 15:14:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742224448; cv=none; b=l9wQKyOzzXpdVDEpuVpX/4AcX7AD7LvHd93Fm4jUjOsAU4wy0NDGABm/6Gt+E+VSnUDopE/uwa3YJSMl/M5FBPtVc0I8mk1Z/ETCnobu/zckQx5Z1zlxBcG2eO52HczDAsDfMHDzHA9+1nRSs2vvKkRMIPInDaIuWSkfhsJ2CQY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742224448; c=relaxed/simple; bh=e+0gOUPXfW8SJ4Yn5ebBipTO79P8ZkfMCVfGKqQu1yk=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=TsJ4iCaORU6Hxv+BbKQCAaeJ7RgcuURYubaoTQRLppuBafkx1C455vokP3bwOfxcYL2FZYK7Wz7iy7K47XhMhzzorsuEzSQATSRN5PQ/A0mpdBdLo/yDqcJ3hlebYY2XLELNo8vrZU/kuc1IDyQktIWz4AAaHZ+nCK6C73XlbFM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--edumazet.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=NWMMclQx; arc=none smtp.client-ip=209.85.160.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--edumazet.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="NWMMclQx" Received: by mail-qt1-f201.google.com with SMTP id d75a77b69052e-4766e03b92bso93379501cf.2 for ; Mon, 17 Mar 2025 08:14:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1742224445; x=1742829245; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=dEyubLBXmUb3Y/zYfRCzpiAemvc6FRR++txvZUnJ5TA=; b=NWMMclQxaCN84SmllWC0HtnGZhyvN8Hro7PERGcjPZ3liLQIvdl7GF+jPAYGhge+8f Wc5VA/kYfG7eLw7AiT/T3Q+OsA8I45TVTjq4BjU9gPU8DJPKOS0EsbTu23uFZ7S5W/74 cbYF+p2jKIbkT8lc4mSJXcDCTWE28McZPxGRoy8ddDNfFCTC4IGswCEEuJc6VNtP9+12 D0zBAAp6s+5bIxg3CcAKoxLCLfZ7g3laELl7vgWQigiCYJS7SKb8GPbpxQbXepx2+TjR DP5XLPCPHMoRO8EQbH2AxUNjf7EptH5M7eBSo6WrOsA2be3f7LRPsHeQGM8APn/xspMZ o9gw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742224445; x=1742829245; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=dEyubLBXmUb3Y/zYfRCzpiAemvc6FRR++txvZUnJ5TA=; b=EvzH6otBlCePL5jZ3fDBHR3X1HR+8lSv+L+UgMxstCuUW68Neo7BgM8A/Bzj5MG4oW VHaljFha6YlYxI2NBbHpTtkmNdbuN56dCQR5E/Z5LCcnv3QNpO2TJTnB4JZIXhKKLySs F2YM9T0bLE9Qy/3+91U8kIqsElhw5+GZl/guJ6rmR/HtxApR69O39nECvp+T+Bh61WBs hhFRkMQ2JOF1vhBB98/RX9jsdPkV+dZEvdIUzs/dfJQml48fiurUJRWfbzcdF+q48GgC cfuETHgXtM8BOiqel3ul6zc6GY5csiboflrJlbPNPcABVnZ2A3ZKNbw2TXFeFg1twNNT frvA== X-Forwarded-Encrypted: i=1; AJvYcCVmfDHwvHx7rFLyW1nQCwEU0ZLfsjK6+aTcHJSLmU1Y6QlwXAf5njqVfaaHTkNthxNDwSFs1L0=@vger.kernel.org X-Gm-Message-State: AOJu0YxdUx5N1BKZBenkVmcbz84u7kkl62Tz7n2bleRRS3buynVwh3pu Sq08QMj/frMiaC4qAY0VXWmT/0UjMaC+Waq0d6ZzdQ4UGcgCmcGPgnO2k23Ze4eD3WyKpoD9qH+ Oqwulod7ZiA== X-Google-Smtp-Source: AGHT+IEp46kTsHSTjYvVME0fJiJtbqXKj6ud+Ijk3QF3dvb5GvmTPagEqXB9FNkbw2y2384ESSUuZ8q4Ubwj7A== X-Received: from qtbbs24.prod.google.com ([2002:ac8:6f18:0:b0:474:f107:af1b]) (user=edumazet job=prod-delivery.src-stubby-dispatcher) by 2002:ac8:7dd0:0:b0:476:6cf7:6c35 with SMTP id d75a77b69052e-476c8148382mr192853421cf.31.1742224445326; Mon, 17 Mar 2025 08:14:05 -0700 (PDT) Date: Mon, 17 Mar 2025 15:14:01 +0000 In-Reply-To: <20250317151401.3439637-1-edumazet@google.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250317151401.3439637-1-edumazet@google.com> X-Mailer: git-send-email 2.49.0.rc1.451.g8f38331e32-goog Message-ID: <20250317151401.3439637-3-edumazet@google.com> Subject: [PATCH net-next 2/2] tcp/dccp: remove icsk->icsk_ack.timeout From: Eric Dumazet To: "David S . Miller" , Jakub Kicinski , Paolo Abeni , Neal Cardwell Cc: Kuniyuki Iwashima , Simon Horman , netdev@vger.kernel.org, eric.dumazet@gmail.com, Eric Dumazet X-Patchwork-Delegate: kuba@kernel.org icsk->icsk_ack.timeout can be replaced by icsk->csk_delack_timer.expires This saves 8 bytes in TCP/DCCP sockets and helps for better cache locality. Signed-off-by: Eric Dumazet Reviewed-by: Kuniyuki Iwashima --- .../net_cachelines/inet_connection_sock.rst | 1 - include/net/inet_connection_sock.h | 12 ++++++++---- net/dccp/output.c | 5 ++--- net/dccp/timer.c | 4 ++-- net/ipv4/tcp_output.c | 7 +++---- net/ipv4/tcp_timer.c | 5 +++-- net/mptcp/options.c | 1 - net/mptcp/protocol.c | 1 - 8 files changed, 18 insertions(+), 18 deletions(-) diff --git a/Documentation/networking/net_cachelines/inet_connection_sock.rst b/Documentation/networking/net_cachelines/inet_connection_sock.rst index 5fb0dd70c9af76ca68b3406ce76d4b61957c7da9..8fae85ebb773085b249c606ce37872e0566b70b4 100644 --- a/Documentation/networking/net_cachelines/inet_connection_sock.rst +++ b/Documentation/networking/net_cachelines/inet_connection_sock.rst @@ -38,7 +38,6 @@ struct icsk_ack_u8 quick read_write w struct icsk_ack_u8 pingpong struct icsk_ack_u8 retry write_mostly read_write inet_csk_clear_xmit_timer,tcp_rearm_rto,tcp_event_new_data_sent,tcp_write_xmit,__tcp_send_ack,tcp_send_ack, struct icsk_ack_u8 ato read_mostly write_mostly tcp_dec_quickack_mode,tcp_event_ack_sent,__tcp_transmit_skb,__tcp_send_ack,tcp_send_ack -struct icsk_ack_unsigned_long timeout read_write read_write inet_csk_reset_xmit_timer,tcp_connect struct icsk_ack_u32 lrcvtime read_write tcp_finish_connect,tcp_connect,tcp_event_data_sent,__tcp_transmit_skb struct icsk_ack_u16 rcv_mss write_mostly read_mostly __tcp_select_window,__tcp_cleanup_rbuf,tcp_initialize_rcv_mss,tcp_connect_init struct icsk_mtup_int search_high read_write tcp_mtup_init,tcp_sync_mss,tcp_connect_init,tcp_mtu_check_reprobe,tcp_write_xmit diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h index 6cf0fb69fc99ec0d4b368c53733c4cf0ac60669a..a59b343431a958f36cea168dcdc7722860122613 100644 --- a/include/net/inet_connection_sock.h +++ b/include/net/inet_connection_sock.h @@ -116,7 +116,6 @@ struct inet_connection_sock { __u32 ato:ATO_BITS, /* Predicted tick of soft clock */ lrcv_flowlabel:20, /* last received ipv6 flowlabel */ unused:4; - unsigned long timeout; /* Currently scheduled timeout */ __u32 lrcvtime; /* timestamp of last received data packet */ __u16 last_seg_size; /* Size of last incoming segment */ __u16 rcv_mss; /* MSS used for delayed ACK decisions */ @@ -194,6 +193,12 @@ icsk_timeout(const struct inet_connection_sock *icsk) return READ_ONCE(icsk->icsk_retransmit_timer.expires); } +static inline unsigned long +icsk_delack_timeout(const struct inet_connection_sock *icsk) +{ + return READ_ONCE(icsk->icsk_delack_timer.expires); +} + static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what) { struct inet_connection_sock *icsk = inet_csk(sk); @@ -229,16 +234,15 @@ static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what, when = max_when; } + when += jiffies; if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 || what == ICSK_TIME_LOSS_PROBE || what == ICSK_TIME_REO_TIMEOUT) { smp_store_release(&icsk->icsk_pending, what); - when += jiffies; sk_reset_timer(sk, &icsk->icsk_retransmit_timer, when); } else if (what == ICSK_TIME_DACK) { smp_store_release(&icsk->icsk_ack.pending, icsk->icsk_ack.pending | ICSK_ACK_TIMER); - icsk->icsk_ack.timeout = jiffies + when; - sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout); + sk_reset_timer(sk, &icsk->icsk_delack_timer, when); } else { pr_debug("inet_csk BUG: unknown timer value\n"); } diff --git a/net/dccp/output.c b/net/dccp/output.c index 5c2e24f3c39b7ff4ee1d5d96d5e406c96609a022..39cf3430177ac597b0a9fd40bf0d8dfbff5fd92d 100644 --- a/net/dccp/output.c +++ b/net/dccp/output.c @@ -627,11 +627,10 @@ void dccp_send_delayed_ack(struct sock *sk) return; } - if (!time_before(timeout, icsk->icsk_ack.timeout)) - timeout = icsk->icsk_ack.timeout; + if (!time_before(timeout, icsk_delack_timeout(icsk))) + timeout = icsk_delack_timeout(icsk); } icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER; - icsk->icsk_ack.timeout = timeout; sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout); } #endif diff --git a/net/dccp/timer.c b/net/dccp/timer.c index 9fd14a3361893d5f2d9f0ad18a65cff963cc7e22..232ac4ae0a73ff31beca730c14d8b02107aeb926 100644 --- a/net/dccp/timer.c +++ b/net/dccp/timer.c @@ -185,9 +185,9 @@ static void dccp_delack_timer(struct timer_list *t) if (sk->sk_state == DCCP_CLOSED || !(icsk->icsk_ack.pending & ICSK_ACK_TIMER)) goto out; - if (time_after(icsk->icsk_ack.timeout, jiffies)) { + if (time_after(icsk_delack_timeout(icsk), jiffies)) { sk_reset_timer(sk, &icsk->icsk_delack_timer, - icsk->icsk_ack.timeout); + icsk_delack_timeout(icsk)); goto out; } diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index e0a4e5432399a3874e471f2d908bf976350f2696..c29e689d966097fabb83876f21d54201989b444d 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -4225,17 +4225,16 @@ void tcp_send_delayed_ack(struct sock *sk) /* Use new timeout only if there wasn't a older one earlier. */ if (icsk->icsk_ack.pending & ICSK_ACK_TIMER) { /* If delack timer is about to expire, send ACK now. */ - if (time_before_eq(icsk->icsk_ack.timeout, jiffies + (ato >> 2))) { + if (time_before_eq(icsk_delack_timeout(icsk), jiffies + (ato >> 2))) { tcp_send_ack(sk); return; } - if (!time_before(timeout, icsk->icsk_ack.timeout)) - timeout = icsk->icsk_ack.timeout; + if (!time_before(timeout, icsk_delack_timeout(icsk))) + timeout = icsk_delack_timeout(icsk); } smp_store_release(&icsk->icsk_ack.pending, icsk->icsk_ack.pending | ICSK_ACK_SCHED | ICSK_ACK_TIMER); - icsk->icsk_ack.timeout = timeout; sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout); } diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c index d828b74c3e73d75cdae777645e8e8856c0751201..d64383b06a295affb735f60edd4dfd64ad5fb1c8 100644 --- a/net/ipv4/tcp_timer.c +++ b/net/ipv4/tcp_timer.c @@ -322,8 +322,9 @@ void tcp_delack_timer_handler(struct sock *sk) if (!(icsk->icsk_ack.pending & ICSK_ACK_TIMER)) return; - if (time_after(icsk->icsk_ack.timeout, jiffies)) { - sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout); + if (time_after(icsk_delack_timeout(icsk), jiffies)) { + sk_reset_timer(sk, &icsk->icsk_delack_timer, + icsk_delack_timeout(icsk)); return; } icsk->icsk_ack.pending &= ~ICSK_ACK_TIMER; diff --git a/net/mptcp/options.c b/net/mptcp/options.c index fd2de185bc939f8730e87a63ac02a015e610e99c..ad1413e9062d54e60a8441deb12406ed63e4aa72 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -432,7 +432,6 @@ static void clear_3rdack_retransmission(struct sock *sk) struct inet_connection_sock *icsk = inet_csk(sk); sk_stop_timer(sk, &icsk->icsk_delack_timer); - icsk->icsk_ack.timeout = 0; icsk->icsk_ack.ato = 0; icsk->icsk_ack.pending &= ~(ICSK_ACK_SCHED | ICSK_ACK_TIMER); } diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 1ac378ba1d67cd17449ab6c4b4793b65d520ec44..44f7ab463d7550ad728651bad2b1aeb4cd4dea05 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -3420,7 +3420,6 @@ static void schedule_3rdack_retransmission(struct sock *ssk) WARN_ON_ONCE(icsk->icsk_ack.pending & ICSK_ACK_TIMER); smp_store_release(&icsk->icsk_ack.pending, icsk->icsk_ack.pending | ICSK_ACK_SCHED | ICSK_ACK_TIMER); - icsk->icsk_ack.timeout = timeout; sk_reset_timer(ssk, &icsk->icsk_delack_timer, timeout); }