[mirror_iproute2.git] / rdma / link.c

/*
 * link.c	RDMA tool
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 * Authors:     Leon Romanovsky <leonro@mellanox.com>
 */

#include "rdma.h"

static int link_help(struct rd *rd)
{
	pr_out("Usage: %s link show [DEV/PORT_INDEX]\n", rd->filename);
	return 0;
}

static const char *caps_to_str(uint32_t idx)
{
#define RDMA_PORT_FLAGS(x) \
	x(SM, 1) \
	x(NOTICE, 2) \
	x(TRAP, 3) \
	x(OPT_IPD, 4) \
	x(AUTO_MIGR, 5) \
	x(SL_MAP, 6) \
	x(MKEY_NVRAM, 7) \
	x(PKEY_NVRAM, 8) \
	x(LED_INFO, 9) \
	x(SM_DISABLED, 10) \
	x(SYS_IMAGE_GUID, 11) \
	x(PKEY_SW_EXT_PORT_TRAP, 12) \
	x(EXTENDED_SPEEDS, 14) \
	x(CM, 16) \
	x(SNMP_TUNNEL, 17) \
	x(REINIT, 18) \
	x(DEVICE_MGMT, 19) \
	x(VENDOR_CLASS, 20) \
	x(DR_NOTICE, 21) \
	x(CAP_MASK_NOTICE, 22) \
	x(BOOT_MGMT, 23) \
	x(LINK_LATENCY, 24) \
	x(CLIENT_REG, 25) \
	x(IP_BASED_GIDS, 26)

	enum { RDMA_PORT_FLAGS(RDMA_BITMAP_ENUM) };

	static const char * const
		rdma_port_names[] = { RDMA_PORT_FLAGS(RDMA_BITMAP_NAMES) };
	#undef RDMA_PORT_FLAGS

	if (idx < ARRAY_SIZE(rdma_port_names) && rdma_port_names[idx])
		return rdma_port_names[idx];
	return "UNKNOWN";
}

static void link_print_caps(struct rd *rd, struct nlattr **tb)
{
	uint64_t caps;
	uint32_t idx;

	if (!tb[RDMA_NLDEV_ATTR_CAP_FLAGS])
		return;

	caps = mnl_attr_get_u64(tb[RDMA_NLDEV_ATTR_CAP_FLAGS]);

	if (rd->json_output) {
		jsonw_name(rd->jw, "caps");
		jsonw_start_array(rd->jw);
	} else {
		pr_out("\n    caps: <");
	}
	for (idx = 0; caps; idx++) {
		if (caps & 0x1) {
			if (rd->json_output) {
				jsonw_string(rd->jw, caps_to_str(idx));
			} else {
				pr_out("%s", caps_to_str(idx));
				if (caps >> 0x1)
					pr_out(", ");
			}
		}
		caps >>= 0x1;
	}

	if (rd->json_output)
		jsonw_end_array(rd->jw);
	else
		pr_out(">");
}

static void link_print_subnet_prefix(struct rd *rd, struct nlattr **tb)
{
	uint64_t subnet_prefix;
	uint16_t vp[4];
	char str[32];

	if (!tb[RDMA_NLDEV_ATTR_SUBNET_PREFIX])
		return;

	subnet_prefix = mnl_attr_get_u64(tb[RDMA_NLDEV_ATTR_SUBNET_PREFIX]);
	memcpy(vp, &subnet_prefix, sizeof(uint64_t));
	snprintf(str, 32, "%04x:%04x:%04x:%04x", vp[3], vp[2], vp[1], vp[0]);
	if (rd->json_output)
		jsonw_string_field(rd->jw, "subnet_prefix", str);
	else
		pr_out("subnet_prefix %s ", str);
}

static void link_print_lid(struct rd *rd, struct nlattr **tb)
{
	uint32_t lid;

	if (!tb[RDMA_NLDEV_ATTR_LID])
		return;

	lid = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_LID]);
	if (rd->json_output)
		jsonw_uint_field(rd->jw, "lid", lid);
	else
		pr_out("lid %u ", lid);
}

static void link_print_sm_lid(struct rd *rd, struct nlattr **tb)
{
	uint32_t sm_lid;

	if (!tb[RDMA_NLDEV_ATTR_SM_LID])
		return;

	sm_lid = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_SM_LID]);
	if (rd->json_output)
		jsonw_uint_field(rd->jw, "sm_lid", sm_lid);
	else
		pr_out("sm_lid %u ", sm_lid);
}

static void link_print_lmc(struct rd *rd, struct nlattr **tb)
{
	uint8_t lmc;

	if (!tb[RDMA_NLDEV_ATTR_LMC])
		return;

	lmc = mnl_attr_get_u8(tb[RDMA_NLDEV_ATTR_LMC]);
	if (rd->json_output)
		jsonw_uint_field(rd->jw, "lmc", lmc);
	else
		pr_out("lmc %u ", lmc);
}

static const char *link_state_to_str(uint8_t link_state)
{
	static const char * const link_state_str[] = { "NOP", "DOWN",
						       "INIT", "ARMED",
						       "ACTIVE",
						       "ACTIVE_DEFER" };
	if (link_state < ARRAY_SIZE(link_state_str))
		return link_state_str[link_state];
	return "UNKNOWN";
}

static void link_print_state(struct rd *rd, struct nlattr **tb)
{
	uint8_t state;

	if (!tb[RDMA_NLDEV_ATTR_PORT_STATE])
		return;

	state = mnl_attr_get_u8(tb[RDMA_NLDEV_ATTR_PORT_STATE]);
	if (rd->json_output)
		jsonw_string_field(rd->jw, "state", link_state_to_str(state));
	else
		pr_out("state %s ", link_state_to_str(state));
}

static const char *phys_state_to_str(uint8_t phys_state)
{
	static const char * const phys_state_str[] = { "NOP", "SLEEP",
						       "POLLING", "DISABLED",
						       "ARMED", "LINK_UP",
						       "LINK_ERROR_RECOVER",
						       "PHY_TEST", "UNKNOWN",
						       "OPA_OFFLINE",
						       "UNKNOWN", "OPA_TEST" };
	if (phys_state < ARRAY_SIZE(phys_state_str))
		return phys_state_str[phys_state];
	return "UNKNOWN";
};

static void link_print_phys_state(struct rd *rd, struct nlattr **tb)
{
	uint8_t phys_state;

	if (!tb[RDMA_NLDEV_ATTR_PORT_PHYS_STATE])
		return;

	phys_state = mnl_attr_get_u8(tb[RDMA_NLDEV_ATTR_PORT_PHYS_STATE]);
	if (rd->json_output)
		jsonw_string_field(rd->jw, "physical_state",
				   phys_state_to_str(phys_state));
	else
		pr_out("physical_state %s ", phys_state_to_str(phys_state));
}

static void link_print_netdev(struct rd *rd, struct nlattr **tb)
{
	const char *netdev_name;
	uint32_t idx;

	if (!tb[RDMA_NLDEV_ATTR_NDEV_NAME] || !tb[RDMA_NLDEV_ATTR_NDEV_INDEX])
		return;

	netdev_name = mnl_attr_get_str(tb[RDMA_NLDEV_ATTR_NDEV_NAME]);
	idx = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_NDEV_INDEX]);
	if (rd->json_output) {
		jsonw_string_field(rd->jw, "netdev", netdev_name);
		jsonw_uint_field(rd->jw, "netdev_index", idx);
	} else {
		pr_out("netdev %s ", netdev_name);
		if (rd->show_details)
			pr_out("netdev_index %u ", idx);
	}
}

static int link_parse_cb(const struct nlmsghdr *nlh, void *data)
{
	struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {};
	struct rd *rd = data;
	uint32_t port, idx;
	char name[32];

	mnl_attr_parse(nlh, 0, rd_attr_cb, tb);
	if (!tb[RDMA_NLDEV_ATTR_DEV_INDEX] || !tb[RDMA_NLDEV_ATTR_DEV_NAME])
		return MNL_CB_ERROR;

	if (!tb[RDMA_NLDEV_ATTR_PORT_INDEX]) {
		pr_err("This tool doesn't support switches yet\n");
		return MNL_CB_ERROR;
	}

	idx = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]);
	port = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_PORT_INDEX]);
	snprintf(name, 32, "%s/%u",
		 mnl_attr_get_str(tb[RDMA_NLDEV_ATTR_DEV_NAME]), port);

	if (rd->json_output) {
		jsonw_uint_field(rd->jw, "ifindex", idx);
		jsonw_uint_field(rd->jw, "port", port);
		jsonw_string_field(rd->jw, "ifname", name);

	} else {
		pr_out("%u/%u: %s: ", idx, port, name);
	}

	link_print_subnet_prefix(rd, tb);
	link_print_lid(rd, tb);
	link_print_sm_lid(rd, tb);
	link_print_lmc(rd, tb);
	link_print_state(rd, tb);
	link_print_phys_state(rd, tb);
	link_print_netdev(rd, tb);
	if (rd->show_details)
		link_print_caps(rd, tb);

	if (!rd->json_output)
		pr_out("\n");
	return MNL_CB_OK;
}

static int link_no_args(struct rd *rd)
{
	uint32_t seq;
	int ret;

	rd_prepare_msg(rd, RDMA_NLDEV_CMD_PORT_GET, &seq,
		       (NLM_F_REQUEST | NLM_F_ACK));
	mnl_attr_put_u32(rd->nlh, RDMA_NLDEV_ATTR_DEV_INDEX, rd->dev_idx);
	mnl_attr_put_u32(rd->nlh, RDMA_NLDEV_ATTR_PORT_INDEX, rd->port_idx);
	ret = rd_send_msg(rd);
	if (ret)
		return ret;

	if (rd->json_output)
		jsonw_start_object(rd->jw);
	ret = rd_recv_msg(rd, link_parse_cb, rd, seq);
	if (rd->json_output)
		jsonw_end_object(rd->jw);
	return ret;
}

static int link_one_show(struct rd *rd)
{
	const struct rd_cmd cmds[] = {
		{ NULL,		link_no_args},
		{ 0 }
	};

	if (!rd->port_idx)
		return 0;

	return rd_exec_cmd(rd, cmds, "parameter");
}

static int link_show(struct rd *rd)
{
	return rd_exec_link(rd, link_one_show, true);
}

int cmd_link(struct rd *rd)
{
	const struct rd_cmd cmds[] = {
		{ NULL,		link_show },
		{ "show",	link_show },
		{ "list",	link_show },
		{ "help",	link_help },
		{ 0 }
	};

	return rd_exec_cmd(rd, cmds, "link command");
}
Commit	Line	Data
da990ab4 LR	1	/*
	2	* link.c RDMA tool
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Leon Romanovsky <leonro@mellanox.com>
	10	*/
	11
	12	#include "rdma.h"
	13
	14	static int link_help(struct rd *rd)
	15	{
	16	pr_out("Usage: %s link show [DEV/PORT_INDEX]\n", rd->filename);
	17	return 0;
	18	}
	19
	20	static const char *caps_to_str(uint32_t idx)
	21	{
	22	#define RDMA_PORT_FLAGS(x) \
	23	x(SM, 1) \
	24	x(NOTICE, 2) \
	25	x(TRAP, 3) \
	26	x(OPT_IPD, 4) \
	27	x(AUTO_MIGR, 5) \
	28	x(SL_MAP, 6) \
	29	x(MKEY_NVRAM, 7) \
	30	x(PKEY_NVRAM, 8) \
	31	x(LED_INFO, 9) \
	32	x(SM_DISABLED, 10) \
4e2eb9fd	33	x(SYS_IMAGE_GUID, 11) \
da990ab4 LR	34	x(PKEY_SW_EXT_PORT_TRAP, 12) \
	35	x(EXTENDED_SPEEDS, 14) \
	36	x(CM, 16) \
	37	x(SNMP_TUNNEL, 17) \
	38	x(REINIT, 18) \
	39	x(DEVICE_MGMT, 19) \
	40	x(VENDOR_CLASS, 20) \
	41	x(DR_NOTICE, 21) \
	42	x(CAP_MASK_NOTICE, 22) \
	43	x(BOOT_MGMT, 23) \
	44	x(LINK_LATENCY, 24) \
8f478ec2	45	x(CLIENT_REG, 25) \
da990ab4 LR	46	x(IP_BASED_GIDS, 26)
	47
	48	enum { RDMA_PORT_FLAGS(RDMA_BITMAP_ENUM) };
	49
	50	static const char * const
	51	rdma_port_names[] = { RDMA_PORT_FLAGS(RDMA_BITMAP_NAMES) };
	52	#undef RDMA_PORT_FLAGS
	53
	54	if (idx < ARRAY_SIZE(rdma_port_names) && rdma_port_names[idx])
	55	return rdma_port_names[idx];
	56	return "UNKNOWN";
	57	}
	58
7fc75744	59	static void link_print_caps(struct rd rd, struct nlattr *tb)
da990ab4 LR	60	{
	61	uint64_t caps;
	62	uint32_t idx;
	63
	64	if (!tb[RDMA_NLDEV_ATTR_CAP_FLAGS])
	65	return;
	66
	67	caps = mnl_attr_get_u64(tb[RDMA_NLDEV_ATTR_CAP_FLAGS]);
	68
7fc75744 LR	69	if (rd->json_output) {
	70	jsonw_name(rd->jw, "caps");
	71	jsonw_start_array(rd->jw);
	72	} else {
	73	pr_out("\n caps: <");
	74	}
da990ab4 LR	75	for (idx = 0; caps; idx++) {
da990ab4 LR	76	if (caps & 0x1) {
7fc75744 LR	77	if (rd->json_output) {
	78	jsonw_string(rd->jw, caps_to_str(idx));
	79	} else {
	80	pr_out("%s", caps_to_str(idx));
	81	if (caps >> 0x1)
	82	pr_out(", ");
	83	}
da990ab4 LR	84	}
	85	caps >>= 0x1;
	86	}
	87
7fc75744 LR	88	if (rd->json_output)
	89	jsonw_end_array(rd->jw);
	90	else
	91	pr_out(">");
da990ab4 LR	92	}
da990ab4 LR	93
7fc75744	94	static void link_print_subnet_prefix(struct rd rd, struct nlattr *tb)
da990ab4 LR	95	{
da990ab4 LR	96	uint64_t subnet_prefix;
7fc75744 LR	97	uint16_t vp[4];
7fc75744 LR	98	char str[32];
da990ab4 LR	99
	100	if (!tb[RDMA_NLDEV_ATTR_SUBNET_PREFIX])
	101	return;
	102
	103	subnet_prefix = mnl_attr_get_u64(tb[RDMA_NLDEV_ATTR_SUBNET_PREFIX]);
7fc75744 LR	104	memcpy(vp, &subnet_prefix, sizeof(uint64_t));
	105	snprintf(str, 32, "%04x:%04x:%04x:%04x", vp[3], vp[2], vp[1], vp[0]);
	106	if (rd->json_output)
	107	jsonw_string_field(rd->jw, "subnet_prefix", str);
	108	else
	109	pr_out("subnet_prefix %s ", str);
da990ab4 LR	110	}
da990ab4 LR	111
7fc75744	112	static void link_print_lid(struct rd rd, struct nlattr *tb)
da990ab4	113	{
7fc75744 LR	114	uint32_t lid;
7fc75744 LR	115
da990ab4 LR	116	if (!tb[RDMA_NLDEV_ATTR_LID])
	117	return;
	118
7fc75744 LR	119	lid = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_LID]);
	120	if (rd->json_output)
	121	jsonw_uint_field(rd->jw, "lid", lid);
	122	else
	123	pr_out("lid %u ", lid);
da990ab4 LR	124	}
da990ab4 LR	125
7fc75744	126	static void link_print_sm_lid(struct rd rd, struct nlattr *tb)
da990ab4	127	{
7fc75744 LR	128	uint32_t sm_lid;
7fc75744 LR	129
da990ab4 LR	130	if (!tb[RDMA_NLDEV_ATTR_SM_LID])
	131	return;
	132
7fc75744 LR	133	sm_lid = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_SM_LID]);
	134	if (rd->json_output)
	135	jsonw_uint_field(rd->jw, "sm_lid", sm_lid);
	136	else
	137	pr_out("sm_lid %u ", sm_lid);
da990ab4 LR	138	}
da990ab4 LR	139
7fc75744	140	static void link_print_lmc(struct rd rd, struct nlattr *tb)
da990ab4	141	{
7fc75744 LR	142	uint8_t lmc;
7fc75744 LR	143
da990ab4 LR	144	if (!tb[RDMA_NLDEV_ATTR_LMC])
	145	return;
	146
7fc75744 LR	147	lmc = mnl_attr_get_u8(tb[RDMA_NLDEV_ATTR_LMC]);
	148	if (rd->json_output)
	149	jsonw_uint_field(rd->jw, "lmc", lmc);
	150	else
	151	pr_out("lmc %u ", lmc);
da990ab4 LR	152	}
	153
	154	static const char *link_state_to_str(uint8_t link_state)
	155	{
	156	static const char * const link_state_str[] = { "NOP", "DOWN",
	157	"INIT", "ARMED",
	158	"ACTIVE",
	159	"ACTIVE_DEFER" };
	160	if (link_state < ARRAY_SIZE(link_state_str))
	161	return link_state_str[link_state];
	162	return "UNKNOWN";
	163	}
	164
7fc75744	165	static void link_print_state(struct rd rd, struct nlattr *tb)
da990ab4 LR	166	{
	167	uint8_t state;
	168
	169	if (!tb[RDMA_NLDEV_ATTR_PORT_STATE])
	170	return;
	171
	172	state = mnl_attr_get_u8(tb[RDMA_NLDEV_ATTR_PORT_STATE]);
7fc75744 LR	173	if (rd->json_output)
	174	jsonw_string_field(rd->jw, "state", link_state_to_str(state));
	175	else
	176	pr_out("state %s ", link_state_to_str(state));
da990ab4 LR	177	}
	178
	179	static const char *phys_state_to_str(uint8_t phys_state)
	180	{
	181	static const char * const phys_state_str[] = { "NOP", "SLEEP",
	182	"POLLING", "DISABLED",
	183	"ARMED", "LINK_UP",
	184	"LINK_ERROR_RECOVER",
	185	"PHY_TEST", "UNKNOWN",
	186	"OPA_OFFLINE",
	187	"UNKNOWN", "OPA_TEST" };
	188	if (phys_state < ARRAY_SIZE(phys_state_str))
	189	return phys_state_str[phys_state];
	190	return "UNKNOWN";
	191	};
	192
7fc75744	193	static void link_print_phys_state(struct rd rd, struct nlattr *tb)
da990ab4 LR	194	{
	195	uint8_t phys_state;
	196
	197	if (!tb[RDMA_NLDEV_ATTR_PORT_PHYS_STATE])
	198	return;
	199
	200	phys_state = mnl_attr_get_u8(tb[RDMA_NLDEV_ATTR_PORT_PHYS_STATE]);
7fc75744 LR	201	if (rd->json_output)
	202	jsonw_string_field(rd->jw, "physical_state",
	203	phys_state_to_str(phys_state));
	204	else
	205	pr_out("physical_state %s ", phys_state_to_str(phys_state));
da990ab4 LR	206	}
da990ab4 LR	207
15259427 LR	208	static void link_print_netdev(struct rd rd, struct nlattr *tb)
	209	{
	210	const char *netdev_name;
	211	uint32_t idx;
	212
	213	if (!tb[RDMA_NLDEV_ATTR_NDEV_NAME] \|\| !tb[RDMA_NLDEV_ATTR_NDEV_INDEX])
	214	return;
	215
	216	netdev_name = mnl_attr_get_str(tb[RDMA_NLDEV_ATTR_NDEV_NAME]);
	217	idx = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_NDEV_INDEX]);
	218	if (rd->json_output) {
	219	jsonw_string_field(rd->jw, "netdev", netdev_name);
	220	jsonw_uint_field(rd->jw, "netdev_index", idx);
	221	} else {
	222	pr_out("netdev %s ", netdev_name);
	223	if (rd->show_details)
	224	pr_out("netdev_index %u ", idx);
	225	}
	226	}
	227
da990ab4 LR	228	static int link_parse_cb(const struct nlmsghdr nlh, void data)
	229	{
	230	struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {};
	231	struct rd *rd = data;
7fc75744 LR	232	uint32_t port, idx;
7fc75744 LR	233	char name[32];
da990ab4 LR	234
	235	mnl_attr_parse(nlh, 0, rd_attr_cb, tb);
	236	if (!tb[RDMA_NLDEV_ATTR_DEV_INDEX] \|\| !tb[RDMA_NLDEV_ATTR_DEV_NAME])
	237	return MNL_CB_ERROR;
	238
	239	if (!tb[RDMA_NLDEV_ATTR_PORT_INDEX]) {
	240	pr_err("This tool doesn't support switches yet\n");
	241	return MNL_CB_ERROR;
	242	}
	243
7fc75744 LR	244	idx = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]);
	245	port = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_PORT_INDEX]);
	246	snprintf(name, 32, "%s/%u",
	247	mnl_attr_get_str(tb[RDMA_NLDEV_ATTR_DEV_NAME]), port);
	248
	249	if (rd->json_output) {
	250	jsonw_uint_field(rd->jw, "ifindex", idx);
	251	jsonw_uint_field(rd->jw, "port", port);
	252	jsonw_string_field(rd->jw, "ifname", name);
	253
	254	} else {
	255	pr_out("%u/%u: %s: ", idx, port, name);
	256	}
	257
	258	link_print_subnet_prefix(rd, tb);
	259	link_print_lid(rd, tb);
	260	link_print_sm_lid(rd, tb);
	261	link_print_lmc(rd, tb);
	262	link_print_state(rd, tb);
	263	link_print_phys_state(rd, tb);
15259427	264	link_print_netdev(rd, tb);
da990ab4	265	if (rd->show_details)
7fc75744	266	link_print_caps(rd, tb);
da990ab4	267
7fc75744 LR	268	if (!rd->json_output)
7fc75744 LR	269	pr_out("\n");
da990ab4 LR	270	return MNL_CB_OK;
	271	}
	272
	273	static int link_no_args(struct rd *rd)
	274	{
	275	uint32_t seq;
	276	int ret;
	277
	278	rd_prepare_msg(rd, RDMA_NLDEV_CMD_PORT_GET, &seq,
	279	(NLM_F_REQUEST \| NLM_F_ACK));
	280	mnl_attr_put_u32(rd->nlh, RDMA_NLDEV_ATTR_DEV_INDEX, rd->dev_idx);
	281	mnl_attr_put_u32(rd->nlh, RDMA_NLDEV_ATTR_PORT_INDEX, rd->port_idx);
	282	ret = rd_send_msg(rd);
	283	if (ret)
	284	return ret;
	285
7fc75744 LR	286	if (rd->json_output)
	287	jsonw_start_object(rd->jw);
	288	ret = rd_recv_msg(rd, link_parse_cb, rd, seq);
	289	if (rd->json_output)
	290	jsonw_end_object(rd->jw);
	291	return ret;
da990ab4 LR	292	}
	293
	294	static int link_one_show(struct rd *rd)
	295	{
	296	const struct rd_cmd cmds[] = {
	297	{ NULL, link_no_args},
	298	{ 0 }
	299	};
	300
e3dee3c8 LR	301	if (!rd->port_idx)
	302	return 0;
	303
da990ab4 LR	304	return rd_exec_cmd(rd, cmds, "parameter");
	305	}
	306
	307	static int link_show(struct rd *rd)
	308	{
6416d1a0	309	return rd_exec_link(rd, link_one_show, true);
da990ab4 LR	310	}
	311
	312	int cmd_link(struct rd *rd)
	313	{
	314	const struct rd_cmd cmds[] = {
	315	{ NULL, link_show },
	316	{ "show", link_show },
	317	{ "list", link_show },
	318	{ "help", link_help },
	319	{ 0 }
	320	};
	321
	322	return rd_exec_cmd(rd, cmds, "link command");
	323	}