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=-17.2 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,URIBL_BLOCKED,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 BB949C4160E for ; Thu, 4 Mar 2021 12:30:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A4AAD64F1E for ; Thu, 4 Mar 2021 12:30:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240676AbhCDM3l (ORCPT ); Thu, 4 Mar 2021 07:29:41 -0500 Received: from relay.smtp-ext.broadcom.com ([192.19.221.30]:40562 "EHLO relay.smtp-ext.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240626AbhCDM3F (ORCPT ); Thu, 4 Mar 2021 07:29:05 -0500 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 527D822581; Thu, 4 Mar 2021 04:19:56 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 relay.smtp-ext.broadcom.com 527D822581 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=broadcom.com; s=dkimrelay; t=1614860396; bh=TZeHhRQiIohq2Wlci4C9f8oW0wk8hoNs2pmCNB/WCx4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=axRKb/wRMhhiUmXSyj364PFAQX28zQJZ2kRvmtTMfjqmMHMJtAPBHURtrxfvQ/Dyz jSUcxDlymOLkRwiDImWlFIWafitBxgC/hNGP274hRvBKy9xWAf+If1KTAZ/swrGEii AczdLwlrLtB3fLs2jIJgrgajTVfvkOnGjd5oORJs= 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 v8 03/16] nvme: Added a newsysfs attribute appid_store Date: Thu, 4 Mar 2021 10:57:13 +0530 Message-Id: <1614835646-16217-4-git-send-email-muneendra.kumar@broadcom.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1614835646-16217-1-git-send-email-muneendra.kumar@broadcom.com> References: <1614835646-16217-1-git-send-email-muneendra.kumar@broadcom.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@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 Signed-off-by: Muneendra --- 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 38373a0e86ef..4cad4364fbce 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 @@ -3769,10 +3769,81 @@ 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 }; -- 2.26.2