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=-17.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 8E0B8C433E6 for ; Sun, 7 Feb 2021 18:14:06 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4A5CA64D9C for ; Sun, 7 Feb 2021 18:14:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4A5CA64D9C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=marvell.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-ID:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=RVZ+bWM0YRYh+bGLwSuriUwI1KS15RzAgkOI42KP7dg=; b=gWw81HELGshIfdf7+MgQUuHZu zTwqXbNJYCd6zVGOdF+ZBlOCcwWuT0Q/dfxWu9xO8ZX57WMwnQp4Z4ohUOf5jyEdv9ctW1if/xVxZ NZwuNnGOuOVrfL/1xJSN8K5Knv0Uv2lwdCvreJmdCobx15WF8SnKteNCW8ldKnHoB8G4XZAlHnmvU pGaifX+HtcbqVRKz/p2xQQgF7VZ3R2mkF003vwIX7/cGpNQHmUNyhb3U8bOC/d4dbSjrgeTfLBgnH tt/5N5rLtHTG6iv/c+D3yV6fAVwJ/REfpjvORY0Ww+70ZIU4OawWQUL2lbiKo6/3Bbgmx+bQOx5IC biYU3FTlQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l8oZH-0004uV-TO; Sun, 07 Feb 2021 18:13:55 +0000 Received: from mx0a-0016f401.pphosted.com ([67.231.148.174] helo=mx0b-0016f401.pphosted.com) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l8oZC-0004tD-Us for linux-nvme@lists.infradead.org; Sun, 07 Feb 2021 18:13:53 +0000 Received: from pps.filterd (m0045849.ppops.net [127.0.0.1]) by mx0a-0016f401.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 117I6xsC031068; Sun, 7 Feb 2021 10:13:43 -0800 Received: from dc5-exch02.marvell.com ([199.233.59.182]) by mx0a-0016f401.pphosted.com with ESMTP id 36hsbrakm5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Sun, 07 Feb 2021 10:13:43 -0800 Received: from SC-EXCH03.marvell.com (10.93.176.83) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sun, 7 Feb 2021 10:13:42 -0800 Received: from DC5-EXCH02.marvell.com (10.69.176.39) by SC-EXCH03.marvell.com (10.93.176.83) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sun, 7 Feb 2021 10:13:41 -0800 Received: from lbtlvb-pcie154.il.qlogic.org (10.69.176.80) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Sun, 7 Feb 2021 10:13:38 -0800 From: Shai Malin To: , , Subject: [RFC PATCH v3 03/11] nvme-tcp-offload: Add device scan implementation Date: Sun, 7 Feb 2021 20:13:16 +0200 Message-ID: <20210207181324.11429-4-smalin@marvell.com> X-Mailer: git-send-email 2.16.6 In-Reply-To: <20210207181324.11429-1-smalin@marvell.com> References: <20210207181324.11429-1-smalin@marvell.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369, 18.0.737 definitions=2021-02-07_08:2021-02-05, 2021-02-07 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210207_131351_144144_6CE21439 X-CRM114-Status: GOOD ( 15.28 ) 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: smalin@marvell.com, aelior@marvell.com, mkalderon@marvell.com, nassa@marvell.com, Dean Balandin , malin1024@gmail.com, Douglas.Farley@dell.com, Erik.Smith@dell.com, kuba@kernel.org, pkushwaha@marvell.com, davem@davemloft.net Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org From: Dean Balandin This patch implements the create_ctrl skeleton, specifcially to demonstrate how the claim_dev op will be used. The driver scans the registered devices and calls the claim_dev op on each of them, to find the first devices that matches the connection params. Once the correct devices is found (claim_dev returns true), we raise the refcnt of that device and return that device as the device to be used for ctrl currently being created. Signed-off-by: Dean Balandin Signed-off-by: Michal Kalderon Signed-off-by: Ariel Elior Signed-off-by: Shai Malin --- drivers/nvme/host/tcp-offload.c | 82 +++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) diff --git a/drivers/nvme/host/tcp-offload.c b/drivers/nvme/host/tcp-offload.c index ee3800250e47..49e11638b4fd 100644 --- a/drivers/nvme/host/tcp-offload.c +++ b/drivers/nvme/host/tcp-offload.c @@ -13,6 +13,12 @@ static LIST_HEAD(nvme_tcp_ofld_devices); static DECLARE_RWSEM(nvme_tcp_ofld_devices_rwsem); +static inline struct nvme_tcp_ofld_ctrl * +to_tcp_ofld_ctrl(struct nvme_ctrl *nctrl) +{ + return container_of(nctrl, struct nvme_tcp_ofld_ctrl, nctrl); +} + /** * nvme_tcp_ofld_register_dev() - NVMeTCP Offload Library registration * function. @@ -96,6 +102,81 @@ nvme_tcp_ofld_req_done(struct nvme_tcp_ofld_req *req, /* Placeholder - complete request with/without error */ } +struct nvme_tcp_ofld_dev * +nvme_tcp_ofld_lookup_dev(struct nvme_tcp_ofld_ctrl *ctrl) +{ + struct nvme_tcp_ofld_dev *dev; + + down_read(&nvme_tcp_ofld_devices_rwsem); + list_for_each_entry(dev, &nvme_tcp_ofld_devices, entry) { + if (dev->ops->claim_dev(dev, &ctrl->conn_params)) { + /* Increase driver refcnt */ + if (!try_module_get(dev->ops->module)) { + pr_err("try_module_get failed\n"); + dev = NULL; + } + + goto out; + } + } + + dev = NULL; +out: + up_read(&nvme_tcp_ofld_devices_rwsem); + + return dev; +} + +static int nvme_tcp_ofld_setup_ctrl(struct nvme_ctrl *nctrl, bool new) +{ + /* Placeholder - validates inputs and creates admin and IO queues */ + + return 0; +} + +static struct nvme_ctrl * +nvme_tcp_ofld_create_ctrl(struct device *ndev, struct nvmf_ctrl_options *opts) +{ + struct nvme_tcp_ofld_ctrl *ctrl; + struct nvme_tcp_ofld_dev *dev; + struct nvme_ctrl *nctrl; + int rc = 0; + + ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); + if (!ctrl) + return ERR_PTR(-ENOMEM); + + /* Init nvme_tcp_ofld_ctrl and nvme_ctrl params based on received opts */ + + /* Find device that can reach the dest addr */ + dev = nvme_tcp_ofld_lookup_dev(ctrl); + if (!dev) { + pr_info("no device found for addr %s:%s.\n", + opts->traddr, opts->trsvcid); + rc = -EINVAL; + goto out_free_ctrl; + } + + ctrl->dev = dev; + + /* Init queues */ + + /* Call nvme_init_ctrl */ + + rc = nvme_tcp_ofld_setup_ctrl(nctrl, true); + if (rc) + goto out_module_put; + + return nctrl; + +out_module_put: + module_put(dev->ops->module); +out_free_ctrl: + kfree(ctrl); + + return ERR_PTR(rc); +} + static struct nvmf_transport_ops nvme_tcp_ofld_transport = { .name = "tcp_offload", .module = THIS_MODULE, @@ -105,6 +186,7 @@ static struct nvmf_transport_ops nvme_tcp_ofld_transport = { NVMF_OPT_CTRL_LOSS_TMO | NVMF_OPT_RECONNECT_DELAY | NVMF_OPT_HDR_DIGEST | NVMF_OPT_DATA_DIGEST | NVMF_OPT_NR_POLL_QUEUES | NVMF_OPT_TOS, + .create_ctrl = nvme_tcp_ofld_create_ctrl, }; static int __init nvme_tcp_ofld_init_module(void) -- 2.22.0 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme