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 X-Spam-Level: X-Spam-Status: No, score=-17.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1F290C433DB for ; Tue, 12 Jan 2021 00:43:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD863224BD for ; Tue, 12 Jan 2021 00:43:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405067AbhALAZK (ORCPT ); Mon, 11 Jan 2021 19:25:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404196AbhAKXrE (ORCPT ); Mon, 11 Jan 2021 18:47:04 -0500 Received: from mail-pg1-x52e.google.com (mail-pg1-x52e.google.com [IPv6:2607:f8b0:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DEFC7C061786 for ; Mon, 11 Jan 2021 15:46:23 -0800 (PST) Received: by mail-pg1-x52e.google.com with SMTP id q7so208132pgm.5 for ; Mon, 11 Jan 2021 15:46:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to; bh=wDRHP7+cUBhF8uJYWQXgFywCD6TO5IU9paSTreRiAns=; b=TTY4D9vVPxuEb/6dDCa+Blvk7SNjemhzvvcxLlOwRPao5CgKXf1MX2ozjotIYD1kXP sHQM9ku1DH6mcQinqGPj9hzL1N/KSpiOpBdPMtgmXeq6TCOf6octfMnjyF0VxH1DsKwp zc4NQmqHyFt7jQGTI7RmucrFDfNTBR6THX7EQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to; bh=wDRHP7+cUBhF8uJYWQXgFywCD6TO5IU9paSTreRiAns=; b=qDy5aeT8Vk5kDt6aNRdioT7YYiGcMs2V06di9Z58lPnJNK9ogkxR4iGoDxIAPyD27l 0IUz7Tyjh5Pmq/zvjFondUIYcqlRCfbSfiB6Aquz60MX7P5AJYWU1dFLXQlkTwCjchor nsli7Ked7Zit7qPyGf4mgkGfJ3K6aQ8OmjNBvggDRUv50YlSis+1n3fFHD4ANZKAUYw0 ojwL/n+mnGky67gPOlB7OJmx7nvHYIlYg/h4m1RlqsVSi5CQkDIb6lqM9AWLN2VjF/HD ORs2HjjJbZQchzpvEwhoGC52QoQoC/IcaY9mKPbOJZAkYfvhiZIqiS9g5MF/3loF5TLs Fqeg== X-Gm-Message-State: AOAM5331hDpYEL4NP3Obm/3jWrVWs5H9UQLq4vhvRiLkhxl2ybnOnDZV WiTUaierq1lF0BZXESbOwaCF31WDI6Yw7CZhpbz/r0v9p+85qW3IlV5EooS48RyD5Cp3vaX3iJQ xVyWg7RHEbvSITQmkpmHpUG20w/3xt3rSTJqD0fUbBZgzWRJF9Ul5KkzCx4P5f1YtPyXrqGli3Z EpniEFow== X-Google-Smtp-Source: ABdhPJwPmtEKcgZUwkW+JQzP4wopmidYwr9+kjQYUDEoq9kN3MIoL+T6RfIqG8kI6am9u2Ct5zjy/g== X-Received: by 2002:a63:1110:: with SMTP id g16mr1802955pgl.357.1610408782639; Mon, 11 Jan 2021 15:46:22 -0800 (PST) Received: from [10.69.69.102] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id x15sm754799pfa.80.2021.01.11.15.46.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 11 Jan 2021 15:46:21 -0800 (PST) Subject: Re: [PATCH v2] nvmet-fc: associations list protected by rcu, instead of spinlock_irq where possible. To: leonid.ravich@dell.com Cc: lravich@gmail.com, Christoph Hellwig , Sagi Grimberg , Chaitanya Kulkarni , linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org References: <20201224110542.22219-1-leonid.ravich@dell.com> <1609697575-103348-1-git-send-email-leonid.ravich@dell.com> <1609697575-103348-2-git-send-email-leonid.ravich@dell.com> From: James Smart Message-ID: <2d7f5b89-f8a2-f80f-cf8e-d7dc0470acca@broadcom.com> Date: Mon, 11 Jan 2021 15:46:20 -0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <1609697575-103348-2-git-send-email-leonid.ravich@dell.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000781c7905b8a883b4" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --000000000000781c7905b8a883b4 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US On 1/3/2021 10:12 AM, leonid.ravich@dell.com wrote: > From: Leonid Ravich > > searching assoc_list protected by rcu_read_lock if list not changed inline. > and according to the rcu list rules. > > queue array embedded into nvmet_fc_tgt_assoc protected by rcu_read_lock > according to rcu dereference/assign rules. > > queue and assoc object freed after grace period by call_rcu. > > tgtport lock taken for changing assoc_list. > > Reviewed-by: Eldad Zinger > Reviewed-by: Elad Grupi > Signed-off-by: Leonid Ravich > --- > 1) fixed sytle issus > 2) queues array protects by rcu as well > > drivers/nvme/target/fc.c | 81 +++++++++++++++++++++++------------------------- > 1 file changed, 38 insertions(+), 43 deletions(-) > > Reviewed-by: James Smart -- james --000000000000781c7905b8a883b4 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature 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To: leonid.ravich@dell.com References: <20201224110542.22219-1-leonid.ravich@dell.com> <1609697575-103348-1-git-send-email-leonid.ravich@dell.com> <1609697575-103348-2-git-send-email-leonid.ravich@dell.com> From: James Smart Message-ID: <2d7f5b89-f8a2-f80f-cf8e-d7dc0470acca@broadcom.com> Date: Mon, 11 Jan 2021 15:46:20 -0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <1609697575-103348-2-git-send-email-leonid.ravich@dell.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210111_184625_077670_89C3AA4A X-CRM114-Status: GOOD ( 11.68 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sagi Grimberg , Chaitanya Kulkarni , linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, Christoph Hellwig , lravich@gmail.com Content-Type: multipart/mixed; boundary="===============4505558519338890579==" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org --===============4505558519338890579== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000763b6705b8a8836d" --000000000000763b6705b8a8836d Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US On 1/3/2021 10:12 AM, leonid.ravich@dell.com wrote: > From: Leonid Ravich > > searching assoc_list protected by rcu_read_lock if list not changed inline. > and according to the rcu list rules. > > queue array embedded into nvmet_fc_tgt_assoc protected by rcu_read_lock > according to rcu dereference/assign rules. > > queue and assoc object freed after grace period by call_rcu. > > tgtport lock taken for changing assoc_list. > > Reviewed-by: Eldad Zinger > Reviewed-by: Elad Grupi > Signed-off-by: Leonid Ravich > --- > 1) fixed sytle issus > 2) queues array protects by rcu as well > > drivers/nvme/target/fc.c | 81 +++++++++++++++++++++++------------------------- > 1 file changed, 38 insertions(+), 43 deletions(-) > > Reviewed-by: James Smart -- james --000000000000763b6705b8a8836d Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQPwYJKoZIhvcNAQcCoIIQMDCCECwCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg2UMIIE6DCCA9CgAwIBAgIOSBtqCRO9gCTKXSLwFPMwDQYJKoZIhvcNAQELBQAwTDEgMB4GA1UE CxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjMxEzARBgNVBAoTCkdsb2JhbFNpZ24xEzARBgNVBAMT Ckdsb2JhbFNpZ24wHhcNMTYwNjE1MDAwMDAwWhcNMjQwNjE1MDAwMDAwWjBdMQswCQYDVQQGEwJC RTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEzMDEGA1UEAxMqR2xvYmFsU2lnbiBQZXJzb25h bFNpZ24gMiBDQSAtIFNIQTI1NiAtIEczMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA 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