1 files changed, 514 insertions, 0 deletions

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 0000000000..d3c436ead6
--- /dev/null
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c
@@ -0,0 +1,514 @@
+// 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_path_release(struct kobject *kobj)
+{
+	struct rtrs_clt_path *clt_path;
+
+	clt_path = container_of(kobj, struct rtrs_clt_path, kobj);
+
+	free_path(clt_path);
+}
+
+static struct kobj_type ktype_sess = {
+	.sysfs_ops = &kobj_sysfs_ops,
+	.release = rtrs_clt_path_release
+};
+
+static void rtrs_clt_path_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_path_stats_release,
+};
+
+static ssize_t max_reconnect_attempts_show(struct device *dev,
+					   struct device_attribute *attr,
+					   char *page)
+{
+	struct rtrs_clt_sess *clt = container_of(dev, struct rtrs_clt_sess,
+						 dev);
+
+	return sysfs_emit(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_sess *clt  = container_of(dev, struct rtrs_clt_sess,
+						  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_sess *clt;
+
+	clt = container_of(dev, struct rtrs_clt_sess, dev);
+
+	switch (clt->mp_policy) {
+	case MP_POLICY_RR:
+		return sysfs_emit(page, "round-robin (RR: %d)\n",
+				  clt->mp_policy);
+	case MP_POLICY_MIN_INFLIGHT:
+		return sysfs_emit(page, "min-inflight (MI: %d)\n",
+				  clt->mp_policy);
+	case MP_POLICY_MIN_LATENCY:
+		return sysfs_emit(page, "min-latency (ML: %d)\n",
+				  clt->mp_policy);
+	default:
+		return sysfs_emit(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_sess *clt;
+	int value;
+	int ret;
+	size_t len = 0;
+
+	clt = container_of(dev, struct rtrs_clt_sess, dev);
+
+	ret = kstrtoint(buf, 10, &value);
+	if (!ret && (value == MP_POLICY_RR ||
+		     value == MP_POLICY_MIN_INFLIGHT ||
+		     value == MP_POLICY_MIN_LATENCY)) {
+		clt->mp_policy = value;
+		return count;
+	}
+
+	/* distinguish "mi" and "min-latency" with length */
+	len = strnlen(buf, NAME_MAX);
+	if (buf[len - 1] == '\n')
+		len--;
+
+	if (!strncasecmp(buf, "round-robin", 11) ||
+	    (len == 2 && !strncasecmp(buf, "rr", 2)))
+		clt->mp_policy = MP_POLICY_RR;
+	else if (!strncasecmp(buf, "min-inflight", 12) ||
+		 (len == 2 && !strncasecmp(buf, "mi", 2)))
+		clt->mp_policy = MP_POLICY_MIN_INFLIGHT;
+	else if (!strncasecmp(buf, "min-latency", 11) ||
+		 (len == 2 && !strncasecmp(buf, "ml", 2)))
+		clt->mp_policy = MP_POLICY_MIN_LATENCY;
+	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 sysfs_emit(page,
+		"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_sess *clt;
+	const char *nl;
+	size_t len;
+	int err;
+
+	clt = container_of(dev, struct rtrs_clt_sess, 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_path *clt_path;
+
+	clt_path = container_of(kobj, struct rtrs_clt_path, kobj);
+	if (clt_path->state == RTRS_CLT_CONNECTED)
+		return sysfs_emit(page, "connected\n");
+
+	return sysfs_emit(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 *buf)
+{
+	return sysfs_emit(buf, "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_path *clt_path;
+	int ret;
+
+	clt_path = container_of(kobj, struct rtrs_clt_path, kobj);
+	if (!sysfs_streq(buf, "1")) {
+		rtrs_err(clt_path->clt, "%s: unknown value: '%s'\n",
+			  attr->attr.name, buf);
+		return -EINVAL;
+	}
+	ret = rtrs_clt_reconnect_from_sysfs(clt_path);
+	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 *buf)
+{
+	return sysfs_emit(buf, "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_path *clt_path;
+
+	clt_path = container_of(kobj, struct rtrs_clt_path, kobj);
+	if (!sysfs_streq(buf, "1")) {
+		rtrs_err(clt_path->clt, "%s: unknown value: '%s'\n",
+			  attr->attr.name, buf);
+		return -EINVAL;
+	}
+	rtrs_clt_close_conns(clt_path, true);
+
+	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 *buf)
+{
+	return sysfs_emit(buf, "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_path *clt_path;
+	int ret;
+
+	clt_path = container_of(kobj, struct rtrs_clt_path, kobj);
+	if (!sysfs_streq(buf, "1")) {
+		rtrs_err(clt_path->clt, "%s: unknown value: '%s'\n",
+			  attr->attr.name, buf);
+		return -EINVAL;
+	}
+	ret = rtrs_clt_remove_path_from_sysfs(clt_path, &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_from,
+	  rtrs_clt_stats_migration_from_cnt_to_str,
+	  rtrs_clt_reset_cpu_migr_stats);
+
+STAT_ATTR(struct rtrs_clt_stats, cpu_migration_to,
+	  rtrs_clt_stats_migration_to_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_from_attr.attr,
+	&cpu_migration_to_attr.attr,
+	&reconnects_attr.attr,
+	&rdma_attr.attr,
+	&reset_all_attr.attr,
+	NULL
+};
+
+static const 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_path *clt_path;
+
+	clt_path = container_of(kobj, typeof(*clt_path), kobj);
+
+	return sysfs_emit(page, "%u\n", clt_path->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_path *clt_path;
+
+	clt_path = container_of(kobj, struct rtrs_clt_path, kobj);
+
+	return sysfs_emit(page, "%s\n", clt_path->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_cur_latency_show(struct kobject *kobj,
+				    struct kobj_attribute *attr,
+				    char *page)
+{
+	struct rtrs_clt_path *clt_path;
+
+	clt_path = container_of(kobj, struct rtrs_clt_path, kobj);
+
+	return sysfs_emit(page, "%lld ns\n",
+			  ktime_to_ns(clt_path->s.hb_cur_latency));
+}
+
+static struct kobj_attribute rtrs_clt_cur_latency_attr =
+	__ATTR(cur_latency, 0444, rtrs_clt_cur_latency_show, NULL);
+
+static ssize_t rtrs_clt_src_addr_show(struct kobject *kobj,
+				       struct kobj_attribute *attr,
+				       char *page)
+{
+	struct rtrs_clt_path *clt_path;
+	int len;
+
+	clt_path = container_of(kobj, struct rtrs_clt_path, kobj);
+	len = sockaddr_to_str((struct sockaddr *)&clt_path->s.src_addr, page,
+			      PAGE_SIZE);
+	len += sysfs_emit_at(page, len, "\n");
+	return len;
+}
+
+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_path *clt_path;
+	int len;
+
+	clt_path = container_of(kobj, struct rtrs_clt_path, kobj);
+	len = sockaddr_to_str((struct sockaddr *)&clt_path->s.dst_addr, page,
+			      PAGE_SIZE);
+	len += sysfs_emit_at(page, len, "\n");
+	return len;
+}
+
+static struct kobj_attribute rtrs_clt_dst_addr_attr =
+	__ATTR(dst_addr, 0444, rtrs_clt_dst_addr_show, NULL);
+
+static struct attribute *rtrs_clt_path_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,
+	&rtrs_clt_cur_latency_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group rtrs_clt_path_attr_group = {
+	.attrs = rtrs_clt_path_attrs,
+};
+
+int rtrs_clt_create_path_files(struct rtrs_clt_path *clt_path)
+{
+	struct rtrs_clt_sess *clt = clt_path->clt;
+	char str[NAME_MAX];
+	int err;
+	struct rtrs_addr path = {
+		.src = &clt_path->s.src_addr,
+		.dst = &clt_path->s.dst_addr,
+	};
+
+	rtrs_addr_to_str(&path, str, sizeof(str));
+	err = kobject_init_and_add(&clt_path->kobj, &ktype_sess,
+				   clt->kobj_paths,
+				   "%s", str);
+	if (err) {
+		pr_err("kobject_init_and_add: %d\n", err);
+		kobject_put(&clt_path->kobj);
+		return err;
+	}
+	err = sysfs_create_group(&clt_path->kobj, &rtrs_clt_path_attr_group);
+	if (err) {
+		pr_err("sysfs_create_group(): %d\n", err);
+		goto put_kobj;
+	}
+	err = kobject_init_and_add(&clt_path->stats->kobj_stats, &ktype_stats,
+				   &clt_path->kobj, "stats");
+	if (err) {
+		pr_err("kobject_init_and_add: %d\n", err);
+		kobject_put(&clt_path->stats->kobj_stats);
+		goto remove_group;
+	}
+
+	err = sysfs_create_group(&clt_path->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(&clt_path->stats->kobj_stats);
+	kobject_put(&clt_path->stats->kobj_stats);
+remove_group:
+	sysfs_remove_group(&clt_path->kobj, &rtrs_clt_path_attr_group);
+put_kobj:
+	kobject_del(&clt_path->kobj);
+	kobject_put(&clt_path->kobj);
+
+	return err;
+}
+
+void rtrs_clt_destroy_path_files(struct rtrs_clt_path *clt_path,
+				  const struct attribute *sysfs_self)
+{
+	kobject_del(&clt_path->stats->kobj_stats);
+	kobject_put(&clt_path->stats->kobj_stats);
+	if (sysfs_self)
+		sysfs_remove_file_self(&clt_path->kobj, sysfs_self);
+	kobject_del(&clt_path->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 const struct attribute_group rtrs_clt_attr_group = {
+	.attrs = rtrs_clt_attrs,
+};
+
+int rtrs_clt_create_sysfs_root_files(struct rtrs_clt_sess *clt)
+{
+	return sysfs_create_group(&clt->dev.kobj, &rtrs_clt_attr_group);
+}
+
+void rtrs_clt_destroy_sysfs_root(struct rtrs_clt_sess *clt)
+{
+	sysfs_remove_group(&clt->dev.kobj, &rtrs_clt_attr_group);
+
+	if (clt->kobj_paths) {
+		kobject_del(clt->kobj_paths);
+		kobject_put(clt->kobj_paths);
+	}
+}