sims/net/switch: only look up mac address once per packet

1635c937 · Antoine Kaufmann · 43825889 · 1635c937
Commit 1635c937 authored Aug 13, 2021 by Antoine Kaufmann
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Showing with 3 additions and 2 deletions

sims/net/switch/net_switch.cc sims/net/switch/net_switch.cc +3 -2

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--- a/sims/net/switch/net_switch.cc
+++ b/sims/net/switch/net_switch.cc
@@ -409,8 +409,9 @@ static void switch_pkt(Port &port, size_t iport) {
      mac_table[src] = iport;
    }
    // L2 forwarding
-    if (mac_table.count(dst) > 0) {
+    auto i = mac_table.find(dst);
-      size_t eport = mac_table.at(dst);
+    if (i != mac_table.end()) {
+      size_t eport = i->second;
      forward_pkt(pkt_data, pkt_len, eport);
    } else {
      // Broadcast