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RDMA/rtrs: client: sysfs interface functions
authorJack Wang <jinpu.wang@cloud.ionos.com>
Mon, 11 May 2020 13:51:14 +0000 (15:51 +0200)
committerJason Gunthorpe <jgg@mellanox.com>
Sun, 17 May 2020 21:57:14 +0000 (18:57 -0300)
This is the sysfs interface to rtrs sessions on client side:

  /sys/class/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
  |- reconnects
  |- reset_all

Link: https://lore.kernel.org/r/20200511135131.27580-9-danil.kipnis@cloud.ionos.com
Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c [new file with mode: 0644]

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c b/drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c
new file mode 100644 (file)
index 0000000..298b747
--- /dev/null
@@ -0,0 +1,483 @@
+// 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 void rtrs_clt_sess_release(struct kobject *kobj)
+{
+       struct rtrs_clt_sess *sess;
+
+       sess = container_of(kobj, struct rtrs_clt_sess, kobj);
+
+       free_sess(sess);
+}
+
+static struct kobj_type ktype_sess = {
+       .sysfs_ops = &kobj_sysfs_ops,
+       .release = rtrs_clt_sess_release
+};
+
+static void rtrs_clt_sess_stats_release(struct kobject *kobj)
+{
+       struct rtrs_clt_stats *stats;
+
+       stats = container_of(kobj, struct rtrs_clt_stats, kobj_stats);
+
+       free_percpu(stats->pcpu_stats);
+
+       kfree(stats);
+}
+
+static struct kobj_type ktype_stats = {
+       .sysfs_ops = &kobj_sysfs_ops,
+       .release = rtrs_clt_sess_stats_release,
+};
+
+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 (ret) {
+               rtrs_err(clt, "%s: failed to convert string '%s' to int\n",
+                         attr->attr.name, buf);
+               return ret;
+       }
+       if (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 [<source addr>@]<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 (err)
+               return -EINVAL;
+
+       err = rtrs_clt_create_path_from_sysfs(clt, &addr);
+       if (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 (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 (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 (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_stats, cpu_migration,
+         rtrs_clt_stats_migration_cnt_to_str,
+         rtrs_clt_reset_cpu_migr_stats);
+
+STAT_ATTR(struct rtrs_clt_stats, reconnects,
+         rtrs_clt_stats_reconnects_to_str,
+         rtrs_clt_reset_reconnects_stat);
+
+STAT_ATTR(struct rtrs_clt_stats, rdma,
+         rtrs_clt_stats_rdma_to_str,
+         rtrs_clt_reset_rdma_stats);
+
+STAT_ATTR(struct rtrs_clt_stats, 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_attr.attr,
+       &reset_all_attr.attr,
+       NULL
+};
+
+static struct attribute_group rtrs_clt_stats_attr_group = {
+       .attrs = rtrs_clt_stats_attrs,
+};
+
+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_sess, clt->kobj_paths,
+                                  "%s", str);
+       if (err) {
+               pr_err("kobject_init_and_add: %d\n", err);
+               return err;
+       }
+       err = sysfs_create_group(&sess->kobj, &rtrs_clt_sess_attr_group);
+       if (err) {
+               pr_err("sysfs_create_group(): %d\n", err);
+               goto put_kobj;
+       }
+       err = kobject_init_and_add(&sess->stats->kobj_stats, &ktype_stats,
+                                  &sess->kobj, "stats");
+       if (err) {
+               pr_err("kobject_init_and_add: %d\n", err);
+               goto remove_group;
+       }
+
+       err = sysfs_create_group(&sess->stats->kobj_stats,
+                                &rtrs_clt_stats_attr_group);
+       if (err) {
+               pr_err("failed to create stats sysfs group, err: %d\n", err);
+               goto put_kobj_stats;
+       }
+
+       return 0;
+
+put_kobj_stats:
+       kobject_del(&sess->stats->kobj_stats);
+       kobject_put(&sess->stats->kobj_stats);
+remove_group:
+       sysfs_remove_group(&sess->kobj, &rtrs_clt_sess_attr_group);
+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)
+{
+       kobject_del(&sess->stats->kobj_stats);
+       kobject_put(&sess->stats->kobj_stats);
+       if (sysfs_self)
+               sysfs_remove_file_self(&sess->kobj, sysfs_self);
+       kobject_del(&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_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) {
+               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);
+}