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boundary="===============7080100434588363025==" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org --===============7080100434588363025== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000cf0f7d05b33471ad" --000000000000cf0f7d05b33471ad This Patch added a unique application identifier i.e app_id knob to blkcg which allows identification of traffic sources at an individual cgroup based Applications (ex:virtual machine (VM))level in both host and fabric infrastructure. Provided the interface blkcg_get_fc_appid to grab the app identifier associated with a bio. Provided the interface blkcg_set_fc_appid to set the app identifier in a blkcgrp associated with cgroup id Added a new config BLK_CGROUP_FC_APPID and moved the changes under this config Signed-off-by: Muneendra --- v3: Renamed the functions and app_id to more specific Addressed the reference leaks in blkcg_set_app_identifier Added a new config BLK_CGROUP_FC_APPID and moved the changes under this config Added blkcg_get_fc_appid,blkcg_set_fc_appid as inline functions v2: renamed app_identifier to app_id removed the sysfs interface blkio.app_identifie under --- block/Kconfig | 9 ++++++ include/linux/blk-cgroup.h | 65 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 74 insertions(+) diff --git a/block/Kconfig b/block/Kconfig index bbad5e8bbffe..ed22df654ce5 100644 --- a/block/Kconfig +++ b/block/Kconfig @@ -144,6 +144,15 @@ config BLK_CGROUP_IOLATENCY Note, this is an experimental interface and could be changed someday. +config BLK_CGROUP_FC_APPID + bool "Enable support to track FC io Traffic across cgroup applications" + depends on BLK_CGROUP=y + help + Enabling this option enables the support to track FC io traffic across + cgroup applications.It enables the Fabric and the storage targets to + identify, monitor, and handle FC traffic based on vm tags by inserting + application specific identification into the FC frame. + config BLK_CGROUP_IOCOST bool "Enable support for cost model based cgroup IO controller" depends on BLK_CGROUP=y diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h index c8fc9792ac77..00ea1cfa3420 100644 --- a/include/linux/blk-cgroup.h +++ b/include/linux/blk-cgroup.h @@ -30,6 +30,8 @@ /* Max limits for throttle policy */ #define THROTL_IOPS_MAX UINT_MAX +#define APPID_LEN 128 + #ifdef CONFIG_BLK_CGROUP @@ -55,6 +57,9 @@ struct blkcg { struct blkcg_policy_data *cpd[BLKCG_MAX_POLS]; struct list_head all_blkcgs_node; +#ifdef CONFIG_BLK_CGROUP_FC_APPID + char fc_app_id[APPID_LEN]; +#endif #ifdef CONFIG_CGROUP_WRITEBACK struct list_head cgwb_list; #endif @@ -660,4 +665,64 @@ static inline void blk_cgroup_bio_start(struct bio *bio) { } #endif /* CONFIG_BLOCK */ #endif /* CONFIG_BLK_CGROUP */ + +#ifdef CONFIG_BLK_CGROUP_FC_APPID +/* + * Sets the fc_app_id field associted to blkcg + * @buf: application identifier + * @id: cgrp id + * @len: size of appid + */ +static inline int blkcg_set_fc_appid(char *buf, u64 id, size_t len) +{ + struct cgroup *cgrp = NULL; + struct cgroup_subsys_state *css = NULL; + struct blkcg *blkcg = NULL; + int ret = 0; + + cgrp = cgroup_get_from_kernfs_id(id); + if (!cgrp) + return -ENOENT; + css = cgroup_get_e_css(cgrp, &io_cgrp_subsys); + if (!css) { + ret = -ENOENT; + goto out_cgrp_put; + } + blkcg = css_to_blkcg(css); + if (!blkcg) { + ret = -ENOENT; + goto out_put; + } + if (len > APPID_LEN) { + ret = -EINVAL; + goto out_put; + } + strlcpy(blkcg->fc_app_id, buf, len); +out_put: + css_put(css); +out_cgrp_put: + cgroup_put(cgrp); + return ret; +} + +/** + * blkcg_get_fc_appid - grab the app identifier associated with a bio + * @bio: target bio + * + * This returns the app identifier associated with a bio, + * %NULL if not associated. + * Callers are expected to either handle %NULL or know association has been + * done prior to calling this. + */ +static inline char *blkcg_get_fc_appid(struct bio *bio) +{ + if (bio && bio->bi_blkg && + strlen(bio->bi_blkg->blkcg->fc_app_id)) + return bio->bi_blkg->blkcg->fc_app_id; + return NULL; +} +#else +static inline int blkcg_set_fc_appid(char *buf, u64 id, size_t len) { return -EINVAL; } +static inline char *blkcg_get_fc_appid(struct bio *bio) { return NULL; } +#endif /*CONFIG_BLK_CGROUP_FC_APPID*/ #endif /* _BLK_CGROUP_H */ -- 2.26.2 --000000000000cf0f7d05b33471ad 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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