Offer physical NIC identification in stage 1 (#261101)

This has been requested for a while.  Some people have
wanted the ability to do an 'ethtool -p' from stage 1 so
they can figure out what NIC port to use.  I can understand
arguments for this feature, but I have still tried to make
it more or less non-invasive.  A new button is on the dev
selection screen called Identify.  Self-explanatory from
there.

2 files changed, 26 insertions, 0 deletions

diff --git a/isys/ethtool.c b/isys/ethtool.c
index df6554970..d71f81fd4 100644
--- a/isys/ethtool.c
+++ b/isys/ethtool.c
@@ -92,3 +92,28 @@ int setEthtoolSettings(char * dev, ethtool_speed speed,
 
     return 0;
 }
+
+int identifyNIC(char *iface, int seconds) {
+    int sock;
+    struct ethtool_value edata;
+    struct ifreq ifr;
+
+    if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+        perror("Unable to create socket");
+        return -1;
+    }
+
+    memset(&ifr, 0, sizeof(ifr));
+    memset(&edata, 0, sizeof(edata));
+
+    strcpy(ifr.ifr_name, iface);
+    edata.cmd = ETHTOOL_PHYS_ID;
+    edata.data = seconds;
+    ifr.ifr_data = (caddr_t) &edata;
+
+    if (ioctl(sock, SIOCETHTOOL, &ifr) < 0) {
+        perror("Unable to identify NIC");
+    }
+
+    return 0;
+}
diff --git a/isys/net.h b/isys/net.h
index 4f7e65ce0..e2f2e3a23 100644
--- a/isys/net.h
+++ b/isys/net.h
@@ -54,5 +54,6 @@ typedef enum ethtool_duplex_t { ETHTOOL_DUPLEX_UNSPEC = -1,
 
 /* set ethtool settings */
 int setEthtoolSettings(char * dev, ethtool_speed speed, ethtool_duplex duplex);
+int identifyNIC(char *iface, int seconds);
 
 #endif