From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB8EAC43217 for ; Tue, 12 Apr 2022 23:24:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230036AbiDLX0r (ORCPT ); Tue, 12 Apr 2022 19:26:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44322 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229934AbiDLX0W (ORCPT ); Tue, 12 Apr 2022 19:26:22 -0400 Received: from mail-oi1-x236.google.com (mail-oi1-x236.google.com [IPv6:2607:f8b0:4864:20::236]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E564FE9964 for ; Tue, 12 Apr 2022 15:40:32 -0700 (PDT) Received: by mail-oi1-x236.google.com with SMTP id q189so232892oia.9 for ; Tue, 12 Apr 2022 15:40:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=DAOJ+2Dw7odh73dz0PwJU+1pGsjezsYHV2vM38MSs88=; b=lGWY8rAe4Vy4evQsQJvRj5XO3VdNphEaelmiyDEGGx7ZQ3XPvMxaO0KRk50vpPwQeZ Q8EBGbj6+JC7sr2wmYu4rzv2ctD3TNwaH3VOruYmifXv+SyOYKuc+KxJCBdYnJvGiI+2 yoUd7/Qm8+JmxETaBRNLXTmFc4ge2zTiT0ra9iKvVaT8EhkL+EgKogHvBPWKOek8Epdk NmYCeOLckRq9JIZm6dp/nBYtPjNmgxfO/PSucCcw81WoEACFrOAOVLOJ/PUWLlFyY7XS V8qdj9EjxZQjYdUQsnFbbiRqbpFuqmsUmV4NG1c+k2ry3tRbELpyL1283ec23VgcWSMO eBBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=DAOJ+2Dw7odh73dz0PwJU+1pGsjezsYHV2vM38MSs88=; b=5LSqNnXg5x5uHJmLU4drKAl9BkWSSowMV//rmys+DiaIteLbi2rkEmmOOhHrbjFzco z8PUVA/jXziwse7r0rttI7nrohkuaflsi+fv2griPG4SbEmsflu/2JU016myeXJ9rmEC siy9nra2fqSFTtcTTZVAAVB27kXNkKCws5Hr27RgaYpxg99HtpgGPkx2W5FUo5opY3SA b1o0x0cYtnQhb0Y96iboPAybWYy0zNPDoKRw9M9anuXYk8HyvC2DlPzkSDvGSSYuvDP+ Nt/ldEV+UnlDg61Le4s/RFFwHGOASA3TBWW8y0fn0YbSPuG/WJBvcrmsyfChYna5W0tM Em7g== X-Gm-Message-State: AOAM531nOebct7iK/I82Hg5FfXGSh9DBRI1bXOm9bUN3gIRAbckhO6yR b/4hvVCJtgKZ3J6fduSmm3pZvZgzBaPu77V2 X-Google-Smtp-Source: ABdhPJycsRiJanTh3wtw2KohBRMlkFr2bIjTqMD80zMNbSPd1Vas/+wa4hKSZlOf8uzVbxRel2O6Wg== X-Received: by 2002:a17:90a:4308:b0:1cb:b996:1dc with SMTP id q8-20020a17090a430800b001cbb99601dcmr6982659pjg.224.1649795177596; Tue, 12 Apr 2022 13:26:17 -0700 (PDT) Received: from localhost.localdomain ([198.8.77.157]) by smtp.gmail.com with ESMTPSA id p12-20020a63ab0c000000b00381f7577a5csm3609084pgf.17.2022.04.12.13.26.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Apr 2022 13:26:17 -0700 (PDT) From: Jens Axboe To: io-uring@vger.kernel.org, netdev@vger.kernel.org Cc: Jens Axboe Subject: [PATCH 2/4] net: allow sk_prot->release_cb() without sock lock held Date: Tue, 12 Apr 2022 14:26:11 -0600 Message-Id: <20220412202613.234896-3-axboe@kernel.dk> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220412202613.234896-1-axboe@kernel.dk> References: <20220412202613.234896-1-axboe@kernel.dk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Add helpers that allow ->release_cb() to acquire the socket bh lock when needed. For normal sockets, ->release_cb() is always invoked with that lock held. For nolock sockets it will not be held, so provide an easy way to acquire it when necessary. Signed-off-by: Jens Axboe --- include/net/sock.h | 10 ++++++++++ net/atm/common.c | 5 ++++- net/ipv4/tcp_output.c | 2 ++ net/mptcp/protocol.c | 3 +++ net/smc/af_smc.c | 2 ++ 5 files changed, 21 insertions(+), 1 deletion(-) diff --git a/include/net/sock.h b/include/net/sock.h index e8283a65b757..99fcc4d7eed9 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -1696,6 +1696,16 @@ void release_sock(struct sock *sk); SINGLE_DEPTH_NESTING) #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) +/* nolock helpers */ +#define bh_lock_sock_on_nolock(__sk) do { \ + if ((__sk)->sk_no_lock) \ + spin_lock_bh(&(__sk)->sk_lock.slock); \ +} while (0) +#define bh_unlock_sock_on_nolock(__sk) do { \ + if ((__sk)->sk_no_lock) \ + spin_unlock_bh(&(__sk)->sk_lock.slock); \ +} while (0) + bool __lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock); /** diff --git a/net/atm/common.c b/net/atm/common.c index 1cfa9bf1d187..471363e929f6 100644 --- a/net/atm/common.c +++ b/net/atm/common.c @@ -126,8 +126,11 @@ static void vcc_release_cb(struct sock *sk) { struct atm_vcc *vcc = atm_sk(sk); - if (vcc->release_cb) + if (vcc->release_cb) { + bh_lock_sock_on_nolock(sk); vcc->release_cb(vcc); + bh_lock_sock_on_nolock(sk); + } } static struct proto vcc_proto = { diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 9ede847f4199..9f86ea63cbac 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1100,6 +1100,7 @@ void tcp_release_cb(struct sock *sk) * But following code is meant to be called from BH handlers, * so we should keep BH disabled, but early release socket ownership */ + bh_lock_sock_on_nolock(sk); sock_release_ownership(sk); if (flags & TCPF_WRITE_TIMER_DEFERRED) { @@ -1114,6 +1115,7 @@ void tcp_release_cb(struct sock *sk) inet_csk(sk)->icsk_af_ops->mtu_reduced(sk); __sock_put(sk); } + bh_unlock_sock_on_nolock(sk); } EXPORT_SYMBOL(tcp_release_cb); diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 0cbea3b6d0a4..ae9078e8e137 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -3065,6 +3065,8 @@ static void mptcp_release_cb(struct sock *sk) { struct mptcp_sock *msk = mptcp_sk(sk); + bh_lock_sock_on_nolock(sk); + for (;;) { unsigned long flags = (msk->cb_flags & MPTCP_FLAGS_PROCESS_CTX_NEED) | msk->push_pending; @@ -3103,6 +3105,7 @@ static void mptcp_release_cb(struct sock *sk) __mptcp_error_report(sk); __mptcp_update_rmem(sk); + bh_unlock_sock_on_nolock(sk); } /* MP_JOIN client subflow must wait for 4th ack before sending any data: diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index f0d118e9f155..3456dc6cd38b 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -201,10 +201,12 @@ static void smc_release_cb(struct sock *sk) { struct smc_sock *smc = smc_sk(sk); + bh_lock_sock_on_nolock(sk); if (smc->conn.tx_in_release_sock) { smc_tx_pending(&smc->conn); smc->conn.tx_in_release_sock = false; } + bh_unlock_sock_on_nolock(sk); } struct proto smc_proto = { -- 2.35.1