[PATCH REPOST v5 iproute2 7/8] rdma: Add json output to link object

Leon Romanovsky
2017-08-17T06:56:13Z

An example for the JSON output for two devices system.

root@mtr-leonro:~# rdma link -d -p -j
[{
"ifindex": 1,
"port": 1,
"ifname": "mlx5_0/1",
"subnet_prefix": "fe80:0000:0000:0000",
"lid": 13399,
"sm_lid": 49151,
"lmc": 0,
"state": "ACTIVE",
"physical_state": "LINK_UP",
"caps": ["AUTO_MIG"
]
},{
"ifindex": 2,
"port": 1,
"ifname": "mlx5_1/1",
"subnet_prefix": "fe80:0000:0000:0000",
"lid": 13400,
"sm_lid": 49151,
"lmc": 0,
"state": "ACTIVE",
"physical_state": "LINK_UP",
"caps": ["AUTO_MIG"
]
}
]

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---
rdma/link.c | 144 +++++++++++++++++++++++++++++++++++++++++++----------------
rdma/rdma.h | 1 -
rdma/utils.c | 8 ----
3 files changed, 105 insertions(+), 48 deletions(-)

diff --git a/rdma/link.c b/rdma/link.c
index b0e5bee0..eae96cd8 100644
--- a/rdma/link.c
+++ b/rdma/link.c
@@ -56,7 +56,7 @@ static const char *caps_to_str(uint32_t idx)
return "UNKNOWN";
}

-static void link_print_caps(struct nlattr **tb)
+static void link_print_caps(struct rd *rd, struct nlattr **tb)
{
uint64_t caps;
uint32_t idx;
@@ -66,54 +66,89 @@ static void link_print_caps(struct nlattr **tb)

caps = mnl_attr_get_u64(tb[RDMA_NLDEV_ATTR_CAP_FLAGS]);

- pr_out("\n caps: <");
+ 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) {
- pr_out("%s", caps_to_str(idx));
- if (caps >> 0x1)
- pr_out(", ");
+ 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;
}

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

-static void link_print_subnet_prefix(struct nlattr **tb)
+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]);
- rd_print_u64("subnet_prefix", 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 nlattr **tb)
+static void link_print_lid(struct rd *rd, struct nlattr **tb)
{
+ uint32_t lid;
+
if (!tb[RDMA_NLDEV_ATTR_LID])
return;

- pr_out("lid %u ",
- mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_LID]));
+ 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 nlattr **tb)
+static void link_print_sm_lid(struct rd *rd, struct nlattr **tb)
{
+ uint32_t sm_lid;
+
if (!tb[RDMA_NLDEV_ATTR_SM_LID])
return;

- pr_out("sm_lid %u ",
- mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_SM_LID]));
+ 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 nlattr **tb)
+static void link_print_lmc(struct rd *rd, struct nlattr **tb)
{
+ uint8_t lmc;
+
if (!tb[RDMA_NLDEV_ATTR_LMC])
return;

- pr_out("lmc %u ", mnl_attr_get_u8(tb[RDMA_NLDEV_ATTR_LMC]));
+ 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)
@@ -127,7 +162,7 @@ static const char *link_state_to_str(uint8_t link_state)
return "UNKNOWN";
}

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

@@ -135,7 +170,10 @@ static void link_print_state(struct nlattr **tb)
return;

state = mnl_attr_get_u8(tb[RDMA_NLDEV_ATTR_PORT_STATE]);
- pr_out("state %s ", link_state_to_str(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)
@@ -152,7 +190,7 @@ static const char *phys_state_to_str(uint8_t phys_state)
return "UNKNOWN";
};

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

@@ -160,13 +198,19 @@ static void link_print_phys_state(struct nlattr **tb)
return;

phys_state = mnl_attr_get_u8(tb[RDMA_NLDEV_ATTR_PORT_PHYS_STATE]);
- pr_out("physical_state %s ", phys_state_to_str(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 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])
@@ -177,21 +221,31 @@ static int link_parse_cb(const struct nlmsghdr *nlh, void *data)
return MNL_CB_ERROR;
}

- pr_out("%u/%u: %s/%u: ",
- mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]),
- mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_PORT_INDEX]),
- mnl_attr_get_str(tb[RDMA_NLDEV_ATTR_DEV_NAME]),
- mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_PORT_INDEX]));
- link_print_subnet_prefix(tb);
- link_print_lid(tb);
- link_print_sm_lid(tb);
- link_print_lmc(tb);
- link_print_state(tb);
- link_print_phys_state(tb);
+ 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);
if (rd->show_details)
- link_print_caps(tb);
+ link_print_caps(rd, tb);

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

@@ -208,7 +262,12 @@ static int link_no_args(struct rd *rd)
if (ret)
return ret;

- return rd_recv_msg(rd, link_parse_cb, rd, seq);
+ 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)
@@ -225,8 +284,10 @@ static int link_show(struct rd *rd)
{
struct dev_map *dev_map;
uint32_t port;
- int ret;
+ int ret = 0;

+ if (rd->json_output)
+ jsonw_start_array(rd->jw);
if (rd_no_arg(rd)) {
list_for_each_entry(dev_map, &rd->dev_map_list, list) {
rd->dev_idx = dev_map->idx;
@@ -234,7 +295,7 @@ static int link_show(struct rd *rd)
rd->port_idx = port;
ret = link_one_show(rd);
if (ret)
- return ret;
+ goto out;
}
}

@@ -243,7 +304,8 @@ static int link_show(struct rd *rd)
port = get_port_from_argv(rd);
if (!dev_map || port > dev_map->num_ports) {
pr_err("Wrong device name\n");
- return -ENOENT;
+ ret = -ENOENT;
+ goto out;
}
rd_arg_inc(rd);
rd->dev_idx = dev_map->idx;
@@ -251,7 +313,7 @@ static int link_show(struct rd *rd)
for (; rd->port_idx < dev_map->num_ports + 1; rd->port_idx++) {
ret = link_one_show(rd);
if (ret)
- return ret;
+ goto out;
if (port)
/*
* We got request to show link for devname
@@ -260,7 +322,11 @@ static int link_show(struct rd *rd)
break;
}
}
- return 0;
+
+out:
+ if (rd->json_output)
+ jsonw_end_array(rd->jw);
+ return ret;
}

int cmd_link(struct rd *rd)
diff --git a/rdma/rdma.h b/rdma/rdma.h
index 5904f177..d62a0ac8 100644
--- a/rdma/rdma.h
+++ b/rdma/rdma.h
@@ -68,7 +68,6 @@ void rd_arg_inc(struct rd *rd);
char *rd_argv(struct rd *rd);
uint32_t get_port_from_argv(struct rd *rd);

-void rd_print_u64(char *name, uint64_t val);
/*
* Commands interface
*/
diff --git a/rdma/utils.c b/rdma/utils.c
index 91d05271..eb4377cf 100644
--- a/rdma/utils.c
+++ b/rdma/utils.c
@@ -59,14 +59,6 @@ uint32_t get_port_from_argv(struct rd *rd)
return slash ? atoi(slash + 1) : 0;
}

-void rd_print_u64(char *name, uint64_t val)
-{
- uint16_t vp[4];
-
- memcpy(vp, &val, sizeof(uint64_t));
- pr_out("%s %04x:%04x:%04x:%04x ", name, vp[3], vp[2], vp[1], vp[0]);
-}
-
static struct dev_map *dev_map_alloc(const char *dev_name)
{
struct dev_map *dev_map;