networkctl: Add support to display min and max MTU

(networkctl)⚡ % ./networkctl status enp0s31f6                                                                                                                          ~/tt/networkctl/build
● 4: enp0s31f6
       Link File: /usr/lib/systemd/network/99-default.link
    Network File: n/a
            Type: ether
           State: n/a (unmanaged)
            Path: pci-0000:00:1f.6
          Driver: e1000e
          Vendor: Intel Corporation
           Model: Ethernet Connection (2) I219-LM
      HW Address: 8c:16:45:6c:83:b9 (LCFC(HeFei) Electronics Technology co., ltd)
             MTU: 1500
     Minimum MTU: 68
     Maximum MTU: 9000

diff --git a/src/network/networkctl.c b/src/network/networkctl.c
index 2c6d4c44e1fe4563c8800775ff7d370f3a8efce4..ddc5c49e25e770816bf992dfde1cc05c2ec25895 100644 (file)
--- a/src/network/networkctl.c
+++ b/src/network/networkctl.c
@@ -101,9 +101,13 @@ typedef struct LinkInfo {
         unsigned short iftype;
         struct ether_addr mac_address;
         uint32_t mtu;
+        uint32_t min_mtu;
+        uint32_t max_mtu;
 
         bool has_mac_address:1;
         bool has_mtu:1;
+        bool has_min_mtu:1;
+        bool has_max_mtu:1;
 } LinkInfo;
 
 static int link_info_compare(const LinkInfo *a, const LinkInfo *b) {
@@ -157,6 +161,14 @@ static int decode_link(sd_netlink_message *m, LinkInfo *info, char **patterns) {
                 sd_netlink_message_read_u32(m, IFLA_MTU, &info->mtu) >= 0 &&
                 info->mtu > 0;
 
+        info->has_min_mtu =
+                sd_netlink_message_read_u32(m, IFLA_MIN_MTU, &info->min_mtu) >= 0 &&
+                info->min_mtu > 0;
+
+        info->has_max_mtu =
+                sd_netlink_message_read_u32(m, IFLA_MAX_MTU, &info->max_mtu) >= 0 &&
+                info->min_mtu > 0;
+
         return 1;
 }
 
@@ -779,6 +791,10 @@ static int link_status_one(
 
         if (info->has_mtu)
                 printf("             MTU: %" PRIu32 "\n", info->mtu);
+        if (info->has_min_mtu)
+                printf("     Minimum MTU: %" PRIu32 "\n", info->min_mtu);
+        if (info->has_max_mtu)
+                printf("     Maximum MTU: %" PRIu32 "\n", info->max_mtu);
 
         (void) dump_addresses(rtnl, "         Address: ", info->ifindex);
         (void) dump_gateways(rtnl, hwdb, "         Gateway: ", info->ifindex);