[PATCH 14/27] ip: iplink_ipoib.c: add json output support

[Julien Fortin]

From: Julien Fortin <jul...@cumulusnetworks.com>

Schema:
{
    "key": {
        "type": "string",
        "attr": "IFLA_IPOIB_PKEY"
    },
    "mode": {
        "type": "string",
        "attr": "IFLA_IPOIB_PKEY"
    },
    "umcast": {
        "type": "string",
        "attr": "IFLA_IPOIB_UMCAST"
    }
}

Signed-off-by: Julien Fortin <jul...@cumulusnetworks.com>
---
 ip/iplink_ipoib.c | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/ip/iplink_ipoib.c b/ip/iplink_ipoib.c
index 86dc65ca..e69bda0e 100644
--- a/ip/iplink_ipoib.c
+++ b/ip/iplink_ipoib.c
@@ -91,23 +91,43 @@ static void ipoib_print_opt(struct link_util *lu, FILE *f, 
struct rtattr *tb[])
            RTA_PAYLOAD(tb[IFLA_IPOIB_PKEY]) < sizeof(__u16))
                return;
 
-       fprintf(f, "pkey  %#.4x ", rta_getattr_u16(tb[IFLA_IPOIB_PKEY]));
+       __u16 pkey = rta_getattr_u16(tb[IFLA_IPOIB_PKEY]);
+
+       if (is_json_context()) {
+               SPRINT_BUF(b1);
+
+               snprintf(b1, sizeof(b1), "%#.4x", pkey);
+               print_string(PRINT_JSON, "key", NULL, b1);
+       } else {
+               fprintf(f, "pkey  %#.4x ", pkey);
+       }
 
        if (!tb[IFLA_IPOIB_MODE] ||
            RTA_PAYLOAD(tb[IFLA_IPOIB_MODE]) < sizeof(__u16))
                return;
 
        mode = rta_getattr_u16(tb[IFLA_IPOIB_MODE]);
-       fprintf(f, "mode  %s ",
+
+       const char *mode_str =
                mode == IPOIB_MODE_DATAGRAM ? "datagram" :
-               mode == IPOIB_MODE_CONNECTED ? "connected" :
-               "unknown");
+               mode == IPOIB_MODE_CONNECTED ? "connected" : "unknown";
+
+       print_string(PRINT_ANY, "mode", "mode  %s ", mode_str);
 
        if (!tb[IFLA_IPOIB_UMCAST] ||
            RTA_PAYLOAD(tb[IFLA_IPOIB_UMCAST]) < sizeof(__u16))
                return;
 
-       fprintf(f, "umcast  %.4x ", rta_getattr_u16(tb[IFLA_IPOIB_UMCAST]));
+       __u16 umcast = rta_getattr_u16(tb[IFLA_IPOIB_UMCAST]);
+
+       if (is_json_context()) {
+               SPRINT_BUF(b1);
+
+               snprintf(b1, sizeof(b1), "%.4x", umcast);
+               print_string(PRINT_JSON, "umcast", NULL, b1);
+       } else {
+               fprintf(f, "umcast  %.4x ", umcast);
+       }
 }
 
 static void ipoib_print_help(struct link_util *lu, int argc, char **argv,
-- 
2.13.3