From d5e1d58ae0ad4b9911a2c5dd05a7d14d2c942242 Mon Sep 17 00:00:00 2001
From: Michael Stapelberg <michael@stapelberg.de>
Date: Sun, 4 Sep 2022 12:42:35 +0200
Subject: [PATCH] ethernet: print faster speeds in Gbit/s
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As a special case, for 2500 Mbit/s, we display “2.5 Gbit/s”.

For other speeds over 1000 Mbit/s, we print “10 Gbit/s”,
“25 Gbit/s” or “100 Gbit/s”.
---
 src/print_eth_info.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/print_eth_info.c b/src/print_eth_info.c
index 82a96db..9e2e22f 100644
--- a/src/print_eth_info.c
+++ b/src/print_eth_info.c
@@ -46,6 +46,13 @@ static int print_eth_speed(char *outwalk, const char *interface) {
     (void)strcpy(ifr.ifr_name, interface);
     if (ioctl(general_socket, SIOCETHTOOL, &ifr) == 0) {
         ethspeed = (ecmd.speed == USHRT_MAX ? 0 : ethtool_cmd_speed(&ecmd));
+        if (ethspeed == 2500) {
+            // 2.5 Gbit/s is the only case where floating point formatting is most
+            // common.
+            return sprintf(outwalk, "%.1f Gbit/s", (double)ethspeed / 1000);
+        } else if (ethspeed > 1000) {
+            return sprintf(outwalk, "%d Gbit/s", ethspeed / 1000);
+        }
         return sprintf(outwalk, "%d Mbit/s", ethspeed);
     } else
         return sprintf(outwalk, "?");