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authorMatan Barak <matanb@mellanox.com>2015-12-23 14:56:55 +0200
committerDoug Ledford <dledford@redhat.com>2015-12-23 10:39:52 -0500
commit045959db65c67d7189dc89ecddb5fa10aafa449d (patch)
tree6b29c2d20fa2a8eb119f90221c04762c7ef75f2d /drivers/infiniband/core/cma_configfs.c
parentIB/rdma_cm: Add wrapper for cma reference count (diff)
downloadlinux-dev-045959db65c67d7189dc89ecddb5fa10aafa449d.tar.xz
linux-dev-045959db65c67d7189dc89ecddb5fa10aafa449d.zip
IB/cma: Add configfs for rdma_cm
Users would like to control the behaviour of rdma_cm. For example, old applications which don't set the required RoCE gid type could be executed on RoCE V2 network types. In order to support this configuration, we implement a configfs for rdma_cm. In order to use the configfs, one needs to mount it and mkdir <IB device name> inside rdma_cm directory. The patch adds support for a single configuration file, default_roce_mode. The mode can either be "IB/RoCE v1" or "RoCE v2". Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/core/cma_configfs.c')
-rw-r--r--drivers/infiniband/core/cma_configfs.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/drivers/infiniband/core/cma_configfs.c b/drivers/infiniband/core/cma_configfs.c
new file mode 100644
index 000000000000..bd1d6402ebd5
--- /dev/null
+++ b/drivers/infiniband/core/cma_configfs.c
@@ -0,0 +1,322 @@
+/*
+ * Copyright (c) 2015, Mellanox Technologies inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/module.h>
+#include <linux/configfs.h>
+#include <rdma/ib_verbs.h>
+#include "core_priv.h"
+
+struct cma_device;
+
+struct cma_dev_group;
+
+struct cma_dev_port_group {
+ unsigned int port_num;
+ struct cma_dev_group *cma_dev_group;
+ struct config_group group;
+};
+
+struct cma_dev_group {
+ char name[IB_DEVICE_NAME_MAX];
+ struct config_group device_group;
+ struct config_group ports_group;
+ struct config_group *default_dev_group[2];
+ struct config_group **default_ports_group;
+ struct cma_dev_port_group *ports;
+};
+
+static struct cma_dev_port_group *to_dev_port_group(struct config_item *item)
+{
+ struct config_group *group;
+
+ if (!item)
+ return NULL;
+
+ group = container_of(item, struct config_group, cg_item);
+ return container_of(group, struct cma_dev_port_group, group);
+}
+
+static bool filter_by_name(struct ib_device *ib_dev, void *cookie)
+{
+ return !strcmp(ib_dev->name, cookie);
+}
+
+static int cma_configfs_params_get(struct config_item *item,
+ struct cma_device **pcma_dev,
+ struct cma_dev_port_group **pgroup)
+{
+ struct cma_dev_port_group *group = to_dev_port_group(item);
+ struct cma_device *cma_dev;
+
+ if (!group)
+ return -ENODEV;
+
+ cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
+ group->cma_dev_group->name);
+ if (!cma_dev)
+ return -ENODEV;
+
+ *pcma_dev = cma_dev;
+ *pgroup = group;
+
+ return 0;
+}
+
+static void cma_configfs_params_put(struct cma_device *cma_dev)
+{
+ cma_deref_dev(cma_dev);
+}
+
+static ssize_t default_roce_mode_show(struct config_item *item,
+ char *buf)
+{
+ struct cma_device *cma_dev;
+ struct cma_dev_port_group *group;
+ int gid_type;
+ ssize_t ret;
+
+ ret = cma_configfs_params_get(item, &cma_dev, &group);
+ if (ret)
+ return ret;
+
+ gid_type = cma_get_default_gid_type(cma_dev, group->port_num);
+ cma_configfs_params_put(cma_dev);
+
+ if (gid_type < 0)
+ return gid_type;
+
+ return sprintf(buf, "%s\n", ib_cache_gid_type_str(gid_type));
+}
+
+static ssize_t default_roce_mode_store(struct config_item *item,
+ const char *buf, size_t count)
+{
+ struct cma_device *cma_dev;
+ struct cma_dev_port_group *group;
+ int gid_type = ib_cache_gid_parse_type_str(buf);
+ ssize_t ret;
+
+ if (gid_type < 0)
+ return -EINVAL;
+
+ ret = cma_configfs_params_get(item, &cma_dev, &group);
+ if (ret)
+ return ret;
+
+ ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);
+
+ cma_configfs_params_put(cma_dev);
+
+ return !ret ? strnlen(buf, count) : ret;
+}
+
+CONFIGFS_ATTR(, default_roce_mode);
+
+static struct configfs_attribute *cma_configfs_attributes[] = {
+ &attr_default_roce_mode,
+ NULL,
+};
+
+static struct config_item_type cma_port_group_type = {
+ .ct_attrs = cma_configfs_attributes,
+ .ct_owner = THIS_MODULE
+};
+
+static int make_cma_ports(struct cma_dev_group *cma_dev_group,
+ struct cma_device *cma_dev)
+{
+ struct ib_device *ibdev;
+ unsigned int i;
+ unsigned int ports_num;
+ struct cma_dev_port_group *ports;
+ int err;
+
+ ibdev = cma_get_ib_dev(cma_dev);
+
+ if (!ibdev)
+ return -ENODEV;
+
+ ports_num = ibdev->phys_port_cnt;
+ ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
+ GFP_KERNEL);
+
+ cma_dev_group->default_ports_group = kcalloc(ports_num + 1,
+ sizeof(*cma_dev_group->ports),
+ GFP_KERNEL);
+
+ if (!ports || !cma_dev_group->default_ports_group) {
+ err = -ENOMEM;
+ goto free;
+ }
+
+ for (i = 0; i < ports_num; i++) {
+ char port_str[10];
+
+ ports[i].port_num = i + 1;
+ snprintf(port_str, sizeof(port_str), "%u", i + 1);
+ ports[i].cma_dev_group = cma_dev_group;
+ config_group_init_type_name(&ports[i].group,
+ port_str,
+ &cma_port_group_type);
+ cma_dev_group->default_ports_group[i] = &ports[i].group;
+ }
+ cma_dev_group->default_ports_group[i] = NULL;
+ cma_dev_group->ports = ports;
+
+ return 0;
+free:
+ kfree(ports);
+ kfree(cma_dev_group->default_ports_group);
+ cma_dev_group->ports = NULL;
+ cma_dev_group->default_ports_group = NULL;
+ return err;
+}
+
+static void release_cma_dev(struct config_item *item)
+{
+ struct config_group *group = container_of(item, struct config_group,
+ cg_item);
+ struct cma_dev_group *cma_dev_group = container_of(group,
+ struct cma_dev_group,
+ device_group);
+
+ kfree(cma_dev_group);
+};
+
+static void release_cma_ports_group(struct config_item *item)
+{
+ struct config_group *group = container_of(item, struct config_group,
+ cg_item);
+ struct cma_dev_group *cma_dev_group = container_of(group,
+ struct cma_dev_group,
+ ports_group);
+
+ kfree(cma_dev_group->ports);
+ kfree(cma_dev_group->default_ports_group);
+ cma_dev_group->ports = NULL;
+ cma_dev_group->default_ports_group = NULL;
+};
+
+static struct configfs_item_operations cma_ports_item_ops = {
+ .release = release_cma_ports_group
+};
+
+static struct config_item_type cma_ports_group_type = {
+ .ct_item_ops = &cma_ports_item_ops,
+ .ct_owner = THIS_MODULE
+};
+
+static struct configfs_item_operations cma_device_item_ops = {
+ .release = release_cma_dev
+};
+
+static struct config_item_type cma_device_group_type = {
+ .ct_item_ops = &cma_device_item_ops,
+ .ct_owner = THIS_MODULE
+};
+
+static struct config_group *make_cma_dev(struct config_group *group,
+ const char *name)
+{
+ int err = -ENODEV;
+ struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
+ (void *)name);
+ struct cma_dev_group *cma_dev_group = NULL;
+
+ if (!cma_dev)
+ goto fail;
+
+ cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
+
+ if (!cma_dev_group) {
+ err = -ENOMEM;
+ goto fail;
+ }
+
+ strncpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
+
+ err = make_cma_ports(cma_dev_group, cma_dev);
+ if (err)
+ goto fail;
+
+ cma_dev_group->ports_group.default_groups =
+ cma_dev_group->default_ports_group;
+ config_group_init_type_name(&cma_dev_group->ports_group, "ports",
+ &cma_ports_group_type);
+
+ cma_dev_group->device_group.default_groups
+ = cma_dev_group->default_dev_group;
+ cma_dev_group->default_dev_group[0] = &cma_dev_group->ports_group;
+ cma_dev_group->default_dev_group[1] = NULL;
+
+ config_group_init_type_name(&cma_dev_group->device_group, name,
+ &cma_device_group_type);
+
+ cma_deref_dev(cma_dev);
+ return &cma_dev_group->device_group;
+
+fail:
+ if (cma_dev)
+ cma_deref_dev(cma_dev);
+ kfree(cma_dev_group);
+ return ERR_PTR(err);
+}
+
+static struct configfs_group_operations cma_subsys_group_ops = {
+ .make_group = make_cma_dev,
+};
+
+static struct config_item_type cma_subsys_type = {
+ .ct_group_ops = &cma_subsys_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct configfs_subsystem cma_subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "rdma_cm",
+ .ci_type = &cma_subsys_type,
+ },
+ },
+};
+
+int __init cma_configfs_init(void)
+{
+ config_group_init(&cma_subsys.su_group);
+ mutex_init(&cma_subsys.su_mutex);
+ return configfs_register_subsystem(&cma_subsys);
+}
+
+void __exit cma_configfs_exit(void)
+{
+ configfs_unregister_subsystem(&cma_subsys);
+}