ifconfig: add report of the string from SIOCGIFDOWNREASON.

Sample output:
# ifconfig mce0
mce0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=3ed07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWFILTER,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6,TXRTLMT,HWRXTSTMP>
        ether e4:1d:2d:e7:10:0a
        media: Ethernet autoselect <full-duplex,rxpause,txpause>
        status: no carrier (Negotiation failure)
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

Reviewed by:	hselasky, rrs
Sponsored by:	Mellanox Technologies
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D21527

diff --git a/sbin/ifconfig/ifmedia.c b/sbin/ifconfig/ifmedia.c
index e80ef592dc003e47df3de84d43c96c1143bebdb0..fdf0d6fb62a092c95875a5125d75c7ea4159ad4f 100644 (file)
--- a/sbin/ifconfig/ifmedia.c
+++ b/sbin/ifconfig/ifmedia.c
@@ -80,6 +80,7 @@
 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -110,18 +111,20 @@ static void
 media_status(int s)
 {
        struct ifmediareq ifmr;
+       struct ifdownreason ifdr;
        int *media_list, i;
-       int xmedia = 1;
+       bool no_carrier, xmedia;
 
        (void) memset(&ifmr, 0, sizeof(ifmr));
        (void) strlcpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));
+       xmedia = true;
 
        /*
         * Check if interface supports extended media types.
         */
        if (ioctl(s, SIOCGIFXMEDIA, (caddr_t)&ifmr) < 0)
-               xmedia = 0;
-       if (xmedia == 0 && ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
+               xmedia = false;
+       if (!xmedia && ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
                /*
                 * Interface doesn't support SIOC{G,S}IFMEDIA.
                 */
@@ -158,6 +161,7 @@ media_status(int s)
        putchar('\n');
 
        if (ifmr.ifm_status & IFM_AVALID) {
+               no_carrier = false;
                printf("\tstatus: ");
                switch (IFM_TYPE(ifmr.ifm_active)) {
                case IFM_ETHER:
@@ -165,7 +169,7 @@ media_status(int s)
                        if (ifmr.ifm_status & IFM_ACTIVE)
                                printf("active");
                        else
-                               printf("no carrier");
+                               no_carrier = true;
                        break;
 
                case IFM_IEEE80211:
@@ -176,9 +180,27 @@ media_status(int s)
                                else
                                        printf("running");
                        } else
-                               printf("no carrier");
+                               no_carrier = true;
                        break;
                }
+               if (no_carrier) {
+                       printf("no carrier");
+                       memset(&ifdr, 0, sizeof(ifdr));
+                       strlcpy(ifdr.ifdr_name, name, sizeof(ifdr.ifdr_name));
+                       if (ioctl(s, SIOCGIFDOWNREASON, (caddr_t)&ifdr) == 0) {
+                               switch (ifdr.ifdr_reason) {
+                               case IFDR_REASON_MSG:
+                                       printf(" (%s)", ifdr.ifdr_msg);
+                                       break;
+                               case IFDR_REASON_VENDOR:
+                                       printf(" (vendor code %d)",
+                                           ifdr.ifdr_vendor);
+                                       break;
+                               default:
+                                       break;
+                               }
+                       }
+               }
                putchar('\n');
        }