[PATCH v7 08/25] RDMA/rtrs: client: sysfs interface functions

Jack Wang
2020-01-16T12:59:34Z

From: Jack Wang <jinpu.wang@cloud.ionos.com>

This is the sysfs interface to rtrs sessions on client side:

/sys/devices/virtual/rtrs-client/<SESS-NAME>/
*** rtrs session created by rtrs_clt_open() API call
|
|- max_reconnect_attempts
| *** number of reconnect attempts for session
|
|- add_path
| *** adds another connection path into rtrs session
|
|- paths/<SRC@DST>/
*** established paths to server in a session
|
|- disconnect
| *** disconnect path
|
|- reconnect
| *** reconnect path
|
|- remove_path
| *** remove current path
|
|- state
| *** retrieve current path state
|
|- hca_port
| *** HCA port number
|
|- hca_name
| *** HCA name
|
|- stats/
*** current path statistics
|
|- cpu_migration
|- rdma
|- rdma_lat
|- reconnects
|- reset_all
|- wc_completions

Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
---
drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c | 492 +++++++++++++++++++
1 file changed, 492 insertions(+)
create mode 100644 drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c b/drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c
new file mode 100644
index 000000000000..30c6b046adb9
--- /dev/null
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c
@@ -0,0 +1,492 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RDMA Transport Layer
+ *
+ * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
+ *
+ * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
+ *
+ * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
+ */
+#undef pr_fmt
+#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
+
+#include "rtrs-pri.h"
+#include "rtrs-clt.h"
+#include "rtrs-log.h"
+
+#define MIN_MAX_RECONN_ATT -1
+#define MAX_MAX_RECONN_ATT 9999
+
+static struct kobj_type ktype = {
+ .sysfs_ops = &kobj_sysfs_ops,
+};
+
+static ssize_t max_reconnect_attempts_show(struct device *dev,
+ struct device_attribute *attr,
+ char *page)
+{
+ struct rtrs_clt *clt = container_of(dev, struct rtrs_clt, dev);
+
+ return sprintf(page, "%d\n", rtrs_clt_get_max_reconnect_attempts(clt));
+}
+
+static ssize_t max_reconnect_attempts_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ int value;
+ int ret;
+ struct rtrs_clt *clt = container_of(dev, struct rtrs_clt, dev);
+
+ ret = kstrtoint(buf, 10, &value);
+ if (unlikely(ret)) {
+ rtrs_err(clt, "%s: failed to convert string '%s' to int\n",
+ attr->attr.name, buf);
+ return ret;
+ }
+ if (unlikely(value > MAX_MAX_RECONN_ATT ||
+ value < MIN_MAX_RECONN_ATT)) {
+ rtrs_err(clt,
+ "%s: invalid range (provided: '%s', accepted: min: %d, max: %d)\n",
+ attr->attr.name, buf, MIN_MAX_RECONN_ATT,
+ MAX_MAX_RECONN_ATT);
+ return -EINVAL;
+ }
+ rtrs_clt_set_max_reconnect_attempts(clt, value);
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(max_reconnect_attempts);
+
+static ssize_t mpath_policy_show(struct device *dev,
+ struct device_attribute *attr,
+ char *page)
+{
+ struct rtrs_clt *clt;
+
+ clt = container_of(dev, struct rtrs_clt, dev);
+
+ switch (clt->mp_policy) {
+ case MP_POLICY_RR:
+ return sprintf(page, "round-robin (RR: %d)\n", clt->mp_policy);
+ case MP_POLICY_MIN_INFLIGHT:
+ return sprintf(page, "min-inflight (MI: %d)\n", clt->mp_policy);
+ default:
+ return sprintf(page, "Unknown (%d)\n", clt->mp_policy);
+ }
+}
+
+static ssize_t mpath_policy_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct rtrs_clt *clt;
+ int value;
+ int ret;
+
+ clt = container_of(dev, struct rtrs_clt, dev);
+
+ ret = kstrtoint(buf, 10, &value);
+ if (!ret && (value == MP_POLICY_RR ||
+ value == MP_POLICY_MIN_INFLIGHT)) {
+ clt->mp_policy = value;
+ return count;
+ }
+
+ if (!strncasecmp(buf, "round-robin", 11) ||
+ !strncasecmp(buf, "rr", 2))
+ clt->mp_policy = MP_POLICY_RR;
+ else if (!strncasecmp(buf, "min-inflight", 12) ||
+ !strncasecmp(buf, "mi", 2))
+ clt->mp_policy = MP_POLICY_MIN_INFLIGHT;
+ else
+ return -EINVAL;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(mpath_policy);
+
+static ssize_t add_path_show(struct device *dev,
+ struct device_attribute *attr, char *page)
+{
+ return scnprintf(page, PAGE_SIZE,
+ "Usage: echo [ @]<destination addr> > %s\n\n*addr ::= [ ip:<ipv4|ipv6> | gid:<gid> ]\n",
+ attr->attr.name);
+}
+
+static ssize_t add_path_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct sockaddr_storage srcaddr, dstaddr;
+ struct rtrs_addr addr = {
+ .src = &srcaddr,
+ .dst = &dstaddr
+ };
+ struct rtrs_clt *clt;
+ const char *nl;
+ size_t len;
+ int err;
+
+ clt = container_of(dev, struct rtrs_clt, dev);
+
+ nl = strchr(buf, '\n');
+ if (nl)
+ len = nl - buf;
+ else
+ len = count;
+ err = rtrs_addr_to_sockaddr(buf, len, clt->port, &addr);
+ if (unlikely(err))
+ return -EINVAL;
+
+ err = rtrs_clt_create_path_from_sysfs(clt, &addr);
+ if (unlikely(err))
+ return err;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(add_path);
+
+static ssize_t rtrs_clt_state_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *page)
+{
+ struct rtrs_clt_sess *sess;
+
+ sess = container_of(kobj, struct rtrs_clt_sess, kobj);
+ if (sess->state == RTRS_CLT_CONNECTED)
+ return sprintf(page, "connected\n");
+
+ return sprintf(page, "disconnected\n");
+}
+
+static struct kobj_attribute rtrs_clt_state_attr =
+ __ATTR(state, 0444, rtrs_clt_state_show, NULL);
+
+static ssize_t rtrs_clt_reconnect_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *page)
+{
+ return scnprintf(page, PAGE_SIZE, "Usage: echo 1 > %s\n",
+ attr->attr.name);
+}
+
+static ssize_t rtrs_clt_reconnect_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct rtrs_clt_sess *sess;
+ int ret;
+
+ sess = container_of(kobj, struct rtrs_clt_sess, kobj);
+ if (!sysfs_streq(buf, "1")) {
+ rtrs_err(sess->clt, "%s: unknown value: '%s'\n",
+ attr->attr.name, buf);
+ return -EINVAL;
+ }
+ ret = rtrs_clt_reconnect_from_sysfs(sess);
+ if (unlikely(ret))
+ return ret;
+
+ return count;
+}
+
+static struct kobj_attribute rtrs_clt_reconnect_attr =
+ __ATTR(reconnect, 0644, rtrs_clt_reconnect_show,
+ rtrs_clt_reconnect_store);
+
+static ssize_t rtrs_clt_disconnect_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *page)
+{
+ return scnprintf(page, PAGE_SIZE, "Usage: echo 1 > %s\n",
+ attr->attr.name);
+}
+
+static ssize_t rtrs_clt_disconnect_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct rtrs_clt_sess *sess;
+ int ret;
+
+ sess = container_of(kobj, struct rtrs_clt_sess, kobj);
+ if (!sysfs_streq(buf, "1")) {
+ rtrs_err(sess->clt, "%s: unknown value: '%s'\n",
+ attr->attr.name, buf);
+ return -EINVAL;
+ }
+ ret = rtrs_clt_disconnect_from_sysfs(sess);
+ if (unlikely(ret))
+ return ret;
+
+ return count;
+}
+
+static struct kobj_attribute rtrs_clt_disconnect_attr =
+ __ATTR(disconnect, 0644, rtrs_clt_disconnect_show,
+ rtrs_clt_disconnect_store);
+
+static ssize_t rtrs_clt_remove_path_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *page)
+{
+ return scnprintf(page, PAGE_SIZE, "Usage: echo 1 > %s\n",
+ attr->attr.name);
+}
+
+static ssize_t rtrs_clt_remove_path_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct rtrs_clt_sess *sess;
+ int ret;
+
+ sess = container_of(kobj, struct rtrs_clt_sess, kobj);
+ if (!sysfs_streq(buf, "1")) {
+ rtrs_err(sess->clt, "%s: unknown value: '%s'\n",
+ attr->attr.name, buf);
+ return -EINVAL;
+ }
+ ret = rtrs_clt_remove_path_from_sysfs(sess, &attr->attr);
+ if (unlikely(ret))
+ return ret;
+
+ return count;
+}
+
+static struct kobj_attribute rtrs_clt_remove_path_attr =
+ __ATTR(remove_path, 0644, rtrs_clt_remove_path_show,
+ rtrs_clt_remove_path_store);
+
+STAT_ATTR(struct rtrs_clt_sess, cpu_migration,
+ rtrs_clt_stats_migration_cnt_to_str,
+ rtrs_clt_reset_cpu_migr_stats);
+
+STAT_ATTR(struct rtrs_clt_sess, reconnects,
+ rtrs_clt_stats_reconnects_to_str,
+ rtrs_clt_reset_reconnects_stat);
+
+STAT_ATTR(struct rtrs_clt_sess, rdma_lat,
+ rtrs_clt_stats_rdma_lat_distr_to_str,
+ rtrs_clt_reset_rdma_lat_distr_stats);
+
+STAT_ATTR(struct rtrs_clt_sess, wc_completion,
+ rtrs_clt_stats_wc_completion_to_str,
+ rtrs_clt_reset_wc_comp_stats);
+
+STAT_ATTR(struct rtrs_clt_sess, rdma,
+ rtrs_clt_stats_rdma_to_str,
+ rtrs_clt_reset_rdma_stats);
+
+STAT_ATTR(struct rtrs_clt_sess, reset_all,
+ rtrs_clt_reset_all_help,
+ rtrs_clt_reset_all_stats);
+
+static struct attribute *rtrs_clt_stats_attrs[] = {
+ &cpu_migration_attr.attr,
+ &reconnects_attr.attr,
+ &rdma_lat_attr.attr,
+ &wc_completion_attr.attr,
+ &rdma_attr.attr,
+ &reset_all_attr.attr,
+ NULL,
+};
+
+static struct attribute_group rtrs_clt_stats_attr_group = {
+ .attrs = rtrs_clt_stats_attrs,
+};
+
+static int rtrs_clt_create_stats_files(struct kobject *kobj,
+ struct kobject *kobj_stats)
+{
+ int ret;
+
+ ret = kobject_init_and_add(kobj_stats, &ktype, kobj, "stats");
+ if (ret) {
+ pr_err("Failed to init and add stats kobject, err: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = sysfs_create_group(kobj_stats, &rtrs_clt_stats_attr_group);
+ if (ret) {
+ pr_err("failed to create stats sysfs group, err: %d\n",
+ ret);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ kobject_del(kobj_stats);
+ kobject_put(kobj_stats);
+
+ return ret;
+}
+
+static ssize_t rtrs_clt_hca_port_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *page)
+{
+ struct rtrs_clt_sess *sess;
+
+ sess = container_of(kobj, typeof(*sess), kobj);
+
+ return scnprintf(page, PAGE_SIZE, "%u\n", sess->hca_port);
+}
+
+static struct kobj_attribute rtrs_clt_hca_port_attr =
+ __ATTR(hca_port, 0444, rtrs_clt_hca_port_show, NULL);
+
+static ssize_t rtrs_clt_hca_name_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *page)
+{
+ struct rtrs_clt_sess *sess;
+
+ sess = container_of(kobj, struct rtrs_clt_sess, kobj);
+
+ return scnprintf(page, PAGE_SIZE, "%s\n", sess->hca_name);
+}
+
+static struct kobj_attribute rtrs_clt_hca_name_attr =
+ __ATTR(hca_name, 0444, rtrs_clt_hca_name_show, NULL);
+
+static ssize_t rtrs_clt_src_addr_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *page)
+{
+ struct rtrs_clt_sess *sess;
+ int cnt;
+
+ sess = container_of(kobj, struct rtrs_clt_sess, kobj);
+ cnt = sockaddr_to_str((struct sockaddr *)&sess->s.src_addr,
+ page, PAGE_SIZE);
+ return cnt + scnprintf(page + cnt, PAGE_SIZE - cnt, "\n");
+}
+
+static struct kobj_attribute rtrs_clt_src_addr_attr =
+ __ATTR(src_addr, 0444, rtrs_clt_src_addr_show, NULL);
+
+static ssize_t rtrs_clt_dst_addr_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *page)
+{
+ struct rtrs_clt_sess *sess;
+ int cnt;
+
+ sess = container_of(kobj, struct rtrs_clt_sess, kobj);
+ cnt = sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr,
+ page, PAGE_SIZE);
+ return cnt + scnprintf(page + cnt, PAGE_SIZE - cnt, "\n");
+}
+
+static struct kobj_attribute rtrs_clt_dst_addr_attr =
+ __ATTR(dst_addr, 0444, rtrs_clt_dst_addr_show, NULL);
+
+static struct attribute *rtrs_clt_sess_attrs[] = {
+ &rtrs_clt_hca_name_attr.attr,
+ &rtrs_clt_hca_port_attr.attr,
+ &rtrs_clt_src_addr_attr.attr,
+ &rtrs_clt_dst_addr_attr.attr,
+ &rtrs_clt_state_attr.attr,
+ &rtrs_clt_reconnect_attr.attr,
+ &rtrs_clt_disconnect_attr.attr,
+ &rtrs_clt_remove_path_attr.attr,
+ NULL,
+};
+
+static struct attribute_group rtrs_clt_sess_attr_group = {
+ .attrs = rtrs_clt_sess_attrs,
+};
+
+int rtrs_clt_create_sess_files(struct rtrs_clt_sess *sess)
+{
+ struct rtrs_clt *clt = sess->clt;
+ char str[NAME_MAX];
+ int err, cnt;
+
+ cnt = sockaddr_to_str((struct sockaddr *)&sess->s.src_addr,
+ str, sizeof(str));
+ cnt += scnprintf(str + cnt, sizeof(str) - cnt, "@");
+ sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr,
+ str + cnt, sizeof(str) - cnt);
+
+ err = kobject_init_and_add(&sess->kobj, &ktype, &clt->kobj_paths,
+ "%s", str);
+ if (unlikely(err)) {
+ pr_err("kobject_init_and_add: %d\n", err);
+ return err;
+ }
+ err = sysfs_create_group(&sess->kobj, &rtrs_clt_sess_attr_group);
+ if (unlikely(err)) {
+ pr_err("sysfs_create_group(): %d\n", err);
+ goto put_kobj;
+ }
+ err = rtrs_clt_create_stats_files(&sess->kobj, &sess->kobj_stats);
+ if (unlikely(err))
+ goto put_kobj;
+
+ return 0;
+
+put_kobj:
+ kobject_del(&sess->kobj);
+ kobject_put(&sess->kobj);
+
+ return err;
+}
+
+void rtrs_clt_destroy_sess_files(struct rtrs_clt_sess *sess,
+ const struct attribute *sysfs_self)
+{
+ if (sess->kobj.state_in_sysfs) {
+ kobject_del(&sess->kobj_stats);
+ kobject_put(&sess->kobj_stats);
+ if (sysfs_self)
+ /* To avoid deadlock firstly commit suicide */
+ sysfs_remove_file_self(&sess->kobj, sysfs_self);
+ kobject_del(&sess->kobj);
+ kobject_put(&sess->kobj);
+ }
+}
+
+static struct attribute *rtrs_clt_attrs[] = {
+ &dev_attr_max_reconnect_attempts.attr,
+ &dev_attr_mpath_policy.attr,
+ &dev_attr_add_path.attr,
+ NULL,
+};
+
+static struct attribute_group rtrs_clt_attr_group = {
+ .attrs = rtrs_clt_attrs,
+};
+
+int rtrs_clt_create_sysfs_root_folders(struct rtrs_clt *clt)
+{
+ return kobject_init_and_add(&clt->kobj_paths, &ktype,
+ &clt->dev.kobj, "paths");
+}
+
+int rtrs_clt_create_sysfs_root_files(struct rtrs_clt *clt)
+{
+ return sysfs_create_group(&clt->dev.kobj, &rtrs_clt_attr_group);
+}
+
+void rtrs_clt_destroy_sysfs_root_folders(struct rtrs_clt *clt)
+{
+ if (clt->kobj_paths.state_in_sysfs) {
+ kobject_del(&clt->kobj_paths);
+ kobject_put(&clt->kobj_paths);
+ }
+}
+
+void rtrs_clt_destroy_sysfs_root_files(struct rtrs_clt *clt)
+{
+ sysfs_remove_group(&clt->dev.kobj, &rtrs_clt_attr_group);
+}
--
2.17.1