RDMA/mlx5: Introduce GET_DATA_DIRECT_SYSFS_PATH ioctl

Introduce the 'GET_DATA_DIRECT_SYSFS_PATH' ioctl to return the sysfs
path of the affiliated 'data direct' device for a given device.

Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://patch.msgid.link/403745463e0ef52adbef681ff09aa6a29a756352.1722512548.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>

diff --git a/drivers/infiniband/hw/mlx5/std_types.c b/drivers/infiniband/hw/mlx5/std_types.c
index 5c83765a85e024f0f8e8aa49f61b2158f2563f32..bdb568411091c84939f0c29d110e9246b80651b6 100644 (file)
--- a/drivers/infiniband/hw/mlx5/std_types.c
+++ b/drivers/infiniband/hw/mlx5/std_types.c
@@ -10,6 +10,7 @@
 #include <linux/mlx5/eswitch.h>
 #include <linux/mlx5/vport.h>
 #include "mlx5_ib.h"
+#include "data_direct.h"
 
 #define UVERBS_MODULE_NAME mlx5_ib
 #include <rdma/uverbs_named_ioctl.h>
@@ -204,6 +205,50 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_QUERY_PORT)(
                                             sizeof(info));
 }
 
+static int UVERBS_HANDLER(MLX5_IB_METHOD_GET_DATA_DIRECT_SYSFS_PATH)(
+       struct uverbs_attr_bundle *attrs)
+{
+       struct mlx5_data_direct_dev *data_direct_dev;
+       struct mlx5_ib_ucontext *c;
+       struct mlx5_ib_dev *dev;
+       int out_len = uverbs_attr_get_len(attrs,
+                       MLX5_IB_ATTR_GET_DATA_DIRECT_SYSFS_PATH);
+       u32 dev_path_len;
+       char *dev_path;
+       int ret;
+
+       c = to_mucontext(ib_uverbs_get_ucontext(attrs));
+       if (IS_ERR(c))
+               return PTR_ERR(c);
+       dev = to_mdev(c->ibucontext.device);
+       mutex_lock(&dev->data_direct_lock);
+       data_direct_dev = dev->data_direct_dev;
+       if (!data_direct_dev) {
+               ret = -ENODEV;
+               goto end;
+       }
+
+       dev_path = kobject_get_path(&data_direct_dev->device->kobj, GFP_KERNEL);
+       if (!dev_path) {
+               ret = -ENOMEM;
+               goto end;
+       }
+
+       dev_path_len = strlen(dev_path) + 1;
+       if (dev_path_len > out_len) {
+               ret = -ENOSPC;
+               goto end;
+       }
+
+       ret = uverbs_copy_to(attrs, MLX5_IB_ATTR_GET_DATA_DIRECT_SYSFS_PATH, dev_path,
+                            dev_path_len);
+       kfree(dev_path);
+
+end:
+       mutex_unlock(&dev->data_direct_lock);
+       return ret;
+}
+
 DECLARE_UVERBS_NAMED_METHOD(
        MLX5_IB_METHOD_QUERY_PORT,
        UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_QUERY_PORT_PORT_NUM,
@@ -214,9 +259,17 @@ DECLARE_UVERBS_NAMED_METHOD(
                                   reg_c0),
                UA_MANDATORY));
 
+DECLARE_UVERBS_NAMED_METHOD(
+       MLX5_IB_METHOD_GET_DATA_DIRECT_SYSFS_PATH,
+       UVERBS_ATTR_PTR_OUT(
+               MLX5_IB_ATTR_GET_DATA_DIRECT_SYSFS_PATH,
+               UVERBS_ATTR_MIN_SIZE(0),
+               UA_MANDATORY));
+
 ADD_UVERBS_METHODS(mlx5_ib_device,
                   UVERBS_OBJECT_DEVICE,
-                  &UVERBS_METHOD(MLX5_IB_METHOD_QUERY_PORT));
+                  &UVERBS_METHOD(MLX5_IB_METHOD_QUERY_PORT),
+                  &UVERBS_METHOD(MLX5_IB_METHOD_GET_DATA_DIRECT_SYSFS_PATH));
 
 DECLARE_UVERBS_NAMED_METHOD(
        MLX5_IB_METHOD_PD_QUERY,

diff --git a/include/uapi/rdma/mlx5_user_ioctl_cmds.h b/include/uapi/rdma/mlx5_user_ioctl_cmds.h
index 106276a4cce7a899fe08ed5bb340152adbd95621..fd2e4a3a56b36ea46ac92141d2862efe09089cf1 100644 (file)
--- a/include/uapi/rdma/mlx5_user_ioctl_cmds.h
+++ b/include/uapi/rdma/mlx5_user_ioctl_cmds.h
@@ -348,6 +348,7 @@ enum mlx5_ib_pd_methods {
 
 enum mlx5_ib_device_methods {
        MLX5_IB_METHOD_QUERY_PORT = (1U << UVERBS_ID_NS_SHIFT),
+       MLX5_IB_METHOD_GET_DATA_DIRECT_SYSFS_PATH,
 };
 
 enum mlx5_ib_query_port_attrs {
@@ -355,4 +356,8 @@ enum mlx5_ib_query_port_attrs {
        MLX5_IB_ATTR_QUERY_PORT,
 };
 
+enum mlx5_ib_get_data_direct_sysfs_path_attrs {
+       MLX5_IB_ATTR_GET_DATA_DIRECT_SYSFS_PATH = (1U << UVERBS_ID_NS_SHIFT),
+};
+
 #endif