From patchwork Tue Apr 27 22:34:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muneendra Kumar M X-Patchwork-Id: 12228099 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=-17.4 required=3.0 tests=BAYES_00,DATE_IN_PAST_06_12, DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 3DB40C43470 for ; Wed, 28 Apr 2021 05:35:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 23162613C5 for ; Wed, 28 Apr 2021 05:35:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236076AbhD1Fgl (ORCPT ); Wed, 28 Apr 2021 01:36:41 -0400 Received: from relay.smtp-ext.broadcom.com ([192.19.11.229]:58690 "EHLO relay.smtp-ext.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235851AbhD1Fga (ORCPT ); Wed, 28 Apr 2021 01:36:30 -0400 Received: from localhost.localdomain (unknown [10.157.2.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by relay.smtp-ext.broadcom.com (Postfix) with ESMTPS id CBAECE927A; Tue, 27 Apr 2021 22:27:16 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 relay.smtp-ext.broadcom.com CBAECE927A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=broadcom.com; s=dkimrelay; t=1619587639; bh=FHKxiI8jX6Ptk6GaAGidUigfOIpf4Di3Z+Au5CQKu7U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lIdc3OsKPLZBFuySVYDgblQSSYSPDIK29ZQ8kKyXPEf6oQn37dm6hwd0XuPMxNEJm C3L8r18rPDHVLIq9Z9Pbv8AWQ2LTKRVwgRIq1bTIoZkL67zErHT93W5VicJxI7sTHM dl2OZB9zmXvbeRNAjQZEZLJ4xAmjaLRWWbBfSoHU= From: Muneendra To: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, tj@kernel.org, linux-nvme@lists.infradead.org, hare@suse.de Cc: jsmart2021@gmail.com, emilne@redhat.com, mkumar@redhat.com, Muneendra Subject: [PATCH v10 03/13] nvme: Added a newsysfs attribute appid_store Date: Wed, 28 Apr 2021 04:04:47 +0530 Message-Id: <1619562897-14062-4-git-send-email-muneendra.kumar@broadcom.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1619562897-14062-1-git-send-email-muneendra.kumar@broadcom.com> References: <1619562897-14062-1-git-send-email-muneendra.kumar@broadcom.com> Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Added a new sysfs attribute appid_store under /sys/class/fc/fc_udev_device/* With this new interface the user can set the application identfier in the blkcg associted with cgroup id. Once the application identifer has set with this interface it allows identification of traffic sources at an individual cgroup based Applications (ex:virtual machine (VM))level in both host and fabric infrastructure(FC). Below is the interface provided to set the app_id echo ":" >> /sys/class/fc/fc_udev_device/appid_store echo "457E:100000109b521d27" >> /sys/class/fc/fc_udev_device/appid_store Reviewed-by: Hannes Reinecke Signed-off-by: Muneendra Reviewed-by: Himanshu Madhani --- v10: No change v9: No change v8: No change v7: No change v6: No change v5: Replaced APPID_LEN with FC_APPID_LEN v4: No change v3: Replaced blkcg_set_app_identifier function with blkcg_set_fc_appid v2: New Patch --- drivers/nvme/host/fc.c | 73 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 72 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index 20dadd86e981..f0ce876700d6 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -9,7 +9,7 @@ #include #include #include - +#include #include "nvme.h" #include "fabrics.h" #include @@ -3782,10 +3782,81 @@ static ssize_t nvme_fc_nvme_discovery_store(struct device *dev, return count; } + +/*parse the Cgroup id from a buf and returns the length of cgrpid*/ +static int fc_parse_cgrpid(const char *buf, u64 *id) +{ + char cgrp_id[16+1]; + int cgrpid_len, j; + + memset(cgrp_id, 0x0, sizeof(cgrp_id)); + for (cgrpid_len = 0, j = 0; cgrpid_len < 17; cgrpid_len++) { + if (buf[cgrpid_len] != ':') + cgrp_id[cgrpid_len] = buf[cgrpid_len]; + else { + j = 1; + break; + } + } + if (!j) + return -EINVAL; + if (kstrtou64(cgrp_id, 16, id) < 0) + return -EINVAL; + return cgrpid_len; +} + +/* + * fc_update_appid :parses and updates the appid in the blkcg associated with + * cgroupid. + * @buf: buf contains both cgrpid and appid info + * @count: size of the buffer + */ +static int fc_update_appid(const char *buf, size_t count) +{ + u64 cgrp_id; + int appid_len = 0; + int cgrpid_len = 0; + char app_id[FC_APPID_LEN]; + int ret = 0; + + if (buf[count-1] == '\n') + count--; + + if ((count > (16+1+FC_APPID_LEN)) || (!strchr(buf, ':'))) + return -EINVAL; + + cgrpid_len = fc_parse_cgrpid(buf, &cgrp_id); + if (cgrpid_len < 0) + return -EINVAL; + /*appid len is count - cgrpid_len -1 (: + \n) */ + appid_len = count - cgrpid_len - 1; + if (appid_len > FC_APPID_LEN) + return -EINVAL; + + memset(app_id, 0x0, sizeof(app_id)); + memcpy(app_id, &buf[cgrpid_len+1], appid_len); + ret = blkcg_set_fc_appid(app_id, cgrp_id, sizeof(app_id)); + if (ret < 0) + return ret; + return count; +} + +static ssize_t fc_appid_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int ret = 0; + + ret = fc_update_appid(buf, count); + if (ret < 0) + return -EINVAL; + return count; +} static DEVICE_ATTR(nvme_discovery, 0200, NULL, nvme_fc_nvme_discovery_store); +static DEVICE_ATTR(appid_store, 0200, NULL, fc_appid_store); static struct attribute *nvme_fc_attrs[] = { &dev_attr_nvme_discovery.attr, + &dev_attr_appid_store.attr, NULL };