[iproute2-next,v1,1/4] rdma: Add an option to query,set net namespace sharing sys parameter

diff --git a/rdma/Makefile b/rdma/Makefile
index 6a424234..4847f27e 100644
--- a/rdma/Makefile
+++ b/rdma/Makefile
@@ -7,7 +7,7 @@  ifeq ($(HAVE_MNL),y)
 CFLAGS += -I./include/uapi/
 
 RDMA_OBJ = rdma.o utils.o dev.o link.o res.o res-pd.o res-mr.o res-cq.o \
-	   res-cmid.o res-qp.o
+	   res-cmid.o res-qp.o sys.o
 
 TARGETS += rdma
 endif
diff --git a/rdma/rdma.c b/rdma/rdma.c
index 676e03c2..e9f1b4bb 100644
--- a/rdma/rdma.c
+++ b/rdma/rdma.c
@@ -11,7 +11,7 @@  static void help(char *name)
 {
 	pr_out("Usage: %s [ OPTIONS ] OBJECT { COMMAND | help }\n"
 	       "       %s [ -f[orce] ] -b[atch] filename\n"
-	       "where  OBJECT := { dev | link | resource | help }\n"
+	       "where  OBJECT := { dev | link | resource | system | help }\n"
 	       "       OPTIONS := { -V[ersion] | -d[etails] | -j[son] | -p[retty]}\n", name, name);
 }
 
@@ -29,6 +29,7 @@  static int rd_cmd(struct rd *rd, int argc, char **argv)
 		{ "dev",	cmd_dev },
 		{ "link",	cmd_link },
 		{ "resource",	cmd_res },
+		{ "system",	cmd_sys },
 		{ 0 }
 	};
 
diff --git a/rdma/rdma.h b/rdma/rdma.h
index 9ed9e045..885a751e 100644
--- a/rdma/rdma.h
+++ b/rdma/rdma.h
@@ -93,6 +93,7 @@  char *rd_argv(struct rd *rd);
 int cmd_dev(struct rd *rd);
 int cmd_link(struct rd *rd);
 int cmd_res(struct rd *rd);
+int cmd_sys(struct rd *rd);
 int rd_exec_cmd(struct rd *rd, const struct rd_cmd *c, const char *str);
 int rd_exec_dev(struct rd *rd, int (*cb)(struct rd *rd));
 int rd_exec_require_dev(struct rd *rd, int (*cb)(struct rd *rd));
diff --git a/rdma/sys.c b/rdma/sys.c
new file mode 100644
index 00000000..cef39081
--- /dev/null
+++ b/rdma/sys.c
@@ -0,0 +1,138 @@ 
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * sys.c	RDMA tool
+ */
+
+#include "rdma.h"
+
+static int sys_help(struct rd *rd)
+{
+	pr_out("Usage: %s system show [ netns ]\n", rd->filename);
+	pr_out("       %s system set netns { shared | exclusive }\n", rd->filename);
+	return 0;
+}
+
+static const char *netns_modes_str[] = {
+	"exclusive",
+	"shared",
+};
+
+static int sys_show_parse_cb(const struct nlmsghdr *nlh, void *data)
+{
+	struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {};
+	struct rd *rd = data;
+
+	mnl_attr_parse(nlh, 0, rd_attr_cb, tb);
+
+	if (tb[RDMA_NLDEV_SYS_ATTR_NETNS_MODE]) {
+		const char *mode_str;
+		uint8_t netns_mode;
+
+		netns_mode =
+			mnl_attr_get_u8(tb[RDMA_NLDEV_SYS_ATTR_NETNS_MODE]);
+
+		if (netns_mode <= ARRAY_SIZE(netns_modes_str))
+			mode_str = netns_modes_str[netns_mode];
+		else
+			mode_str = "unknown";
+
+		if (rd->json_output)
+			jsonw_string_field(rd->jw, "netns", mode_str);
+		else
+			pr_out("netns %s\n", mode_str);
+	}
+	return MNL_CB_OK;
+}
+
+static int sys_show_no_args(struct rd *rd)
+{
+	uint32_t seq;
+	int ret;
+
+	rd_prepare_msg(rd, RDMA_NLDEV_CMD_SYS_GET,
+		       &seq, (NLM_F_REQUEST | NLM_F_ACK));
+	ret = rd_send_msg(rd);
+	if (ret)
+		return ret;
+
+	return rd_recv_msg(rd, sys_show_parse_cb, rd, seq);
+}
+
+static int sys_show(struct rd *rd)
+{
+	const struct rd_cmd cmds[] = {
+		{ NULL,		sys_show_no_args},
+		{ "netns",	sys_show_no_args},
+		{ 0 }
+	};
+
+	return rd_exec_cmd(rd, cmds, "parameter");
+}
+
+static int sys_set_netns_cmd(struct rd *rd, bool enable)
+{
+	uint32_t seq;
+
+	rd_prepare_msg(rd, RDMA_NLDEV_CMD_SYS_SET,
+		       &seq, (NLM_F_REQUEST | NLM_F_ACK));
+	mnl_attr_put_u8(rd->nlh, RDMA_NLDEV_SYS_ATTR_NETNS_MODE, enable);
+
+	return rd_sendrecv_msg(rd, seq);
+}
+
+static bool sys_valid_netns_cmd(const char *cmd)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(netns_modes_str); i++) {
+		if (!strcmp(cmd, netns_modes_str[i]))
+			return true;
+	}
+	return false;
+}
+
+static int sys_set_netns_args(struct rd *rd)
+{
+	bool cmd;
+
+	if (rd_no_arg(rd) || !sys_valid_netns_cmd(rd_argv(rd))) {
+		pr_err("valid options are: { shared | exclusive }\n");
+		return -EINVAL;
+	}
+
+	cmd = (strcmp(rd_argv(rd), "shared") == 0) ? true : false;
+
+	return sys_set_netns_cmd(rd, cmd);
+}
+
+static int sys_set_help(struct rd *rd)
+{
+	pr_out("Usage: %s system set [PARAM] value\n", rd->filename);
+	pr_out("            system set netns { shared | exclusive }\n");
+	return 0;
+}
+
+static int sys_set(struct rd *rd)
+{
+	const struct rd_cmd cmds[] = {
+		{ NULL,			sys_set_help },
+		{ "help",		sys_set_help },
+		{ "netns",		sys_set_netns_args},
+		{ 0 }
+	};
+
+	return rd_exec_cmd(rd, cmds, "parameter");
+}
+
+int cmd_sys(struct rd *rd)
+{
+	const struct rd_cmd cmds[] = {
+		{ NULL,		sys_show },
+		{ "show",	sys_show },
+		{ "set",	sys_set },
+		{ "help",	sys_help },
+		{ 0 }
+	};
+
+	return rd_exec_cmd(rd, cmds, "system command");
+}
diff --git a/rdma/utils.c b/rdma/utils.c
index 11ed8a73..558d1c29 100644
--- a/rdma/utils.c
+++ b/rdma/utils.c
@@ -435,6 +435,7 @@  static const enum mnl_attr_data_type nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
 	[RDMA_NLDEV_ATTR_DRIVER_U32] = MNL_TYPE_U32,
 	[RDMA_NLDEV_ATTR_DRIVER_S64] = MNL_TYPE_U64,
 	[RDMA_NLDEV_ATTR_DRIVER_U64] = MNL_TYPE_U64,
+	[RDMA_NLDEV_SYS_ATTR_NETNS_MODE] = MNL_TYPE_U8,
 };
 
 int rd_attr_check(const struct nlattr *attr, int *typep)