fix: Set MTU value (#911)

Dockerfile

@@ -37,11 +37,14 @@ RUN set -eu && extra="" && \
         net-tools \
         e2fsprogs \
         qemu-utils \
+        iputils-ping \
         ca-certificates \
         netcat-openbsd \
         qemu-system-x86 \
         "$extra" && \
     apt-get clean && \
+    mkdir -p /etc/qemu && \
+    echo "allow br0" > /etc/qemu/bridge.conf && \
     unlink /etc/nginx/sites-enabled/default && \
     sed -i 's/^worker_processes.*/worker_processes 1;/' /etc/nginx/nginx.conf && \
     echo "$VERSION_ARG" > /run/version && \

readme.md

@@ -223,7 +223,7 @@ kubectl apply -f https://raw.githubusercontent.com/vdsm/virtual-dsm/refs/heads/m
 
   After configuring the container for [macvlan](#how-do-i-assign-an-individual-ip-address-to-the-container), it is possible for DSM to become part of your home network by requesting an IP from your router, just like your other devices.
 
-  To enable this mode, add the following lines to your compose file:
+  To enable this mode, in which the container and DSM will have separate IP addresses, add the following lines to your compose file:
 
   ```yaml
   environment:
@@ -234,9 +234,6 @@ kubectl apply -f https://raw.githubusercontent.com/vdsm/virtual-dsm/refs/heads/m
     - 'c *:* rwm'
   ```
 
-> [!NOTE]
-> In this mode, the container and DSM will each have their own separate IPs.
-
 ### How do I pass-through the GPU?
 
   To pass-through your Intel GPU, add the following lines to your compose file:

src/network.sh

@@ -4,6 +4,7 @@ set -Eeuo pipefail
 # Docker environment variables
 
 : "${MAC:=""}"
+: "${MTU:=""}"
 : "${DHCP:="N"}"
 : "${NETWORK:="Y"}"
 : "${USER_PORTS:=""}"
@@ -58,6 +59,12 @@ configureDHCP() {
       fi ;;
   esac
 
+  if [[ "$MTU" != "0" ]] && [[ "$MTU" != "1500" ]]; then
+    if ! ip link set dev "$VM_NET_TAP" mtu "$MTU"; then
+      warn "Failed to set MTU size.."
+    fi
+  fi
+
   while ! ip link set "$VM_NET_TAP" up; do
     info "Waiting for MAC address $VM_NET_MAC to become available..."
     sleep 2
@@ -213,8 +220,13 @@ configureNAT() {
     error "$tuntap" && return 1
   fi
 
-  GATEWAY_MAC=$(echo "$VM_NET_MAC" | rev)
-  GATEWAY_MAC="02:${GATEWAY_MAC:0:14}"
+  if [[ "$MTU" != "0" ]] && [[ "$MTU" != "1500" ]]; then
+    if ! ip link set dev "$VM_NET_TAP" mtu "$MTU"; then
+      warn "Failed to set MTU size.."
+    fi
+  fi
+
+  GATEWAY_MAC=$(echo "$VM_NET_MAC" | md5sum | sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\).*$/02:\1:\2:\3:\4:\5/')
 
   if ! ip link set dev "$VM_NET_TAP" address "$GATEWAY_MAC"; then
     warn "Failed to set gateway MAC address.."
@@ -345,6 +357,20 @@ getInfo() {
     error "$ADD_ERR -e \"VM_NET_DEV=NAME\" to specify another interface name." && exit 27
   fi
 
+  if [ -z "$MTU" ]; then
+    MTU=$(cat "/sys/class/net/$VM_NET_DEV/mtu")
+  fi
+
+  if [ "$MTU" -gt "1500" ]; then
+    info "MTU size is too large: $MTU, ignoring..." && MTU="0"
+  fi
+
+  if [[ "${ADAPTER,,}" != "virtio-net-pci" ]]; then
+    if [[ "$MTU" != "0" ]] && [[ "$MTU" != "1500" ]]; then
+      warn "MTU size is $MTU, but cannot be set for $ADAPTER adapters!" && MTU="0"
+    fi
+  fi
+
   if [ -z "$VM_NET_MAC" ]; then
     local file="$STORAGE/dsm.mac"
     [ -s "$file" ] && VM_NET_MAC=$(<"$file")
@@ -387,7 +413,10 @@ getInfo
 html "Initializing network..."
 
 if [[ "$DEBUG" == [Yy1]* ]]; then
-  info "Host: $HOST  IP: $IP  Gateway: $GATEWAY  Interface: $VM_NET_DEV  MAC: $VM_NET_MAC"
+  mtu=$(cat "/sys/class/net/$VM_NET_DEV/mtu")
+  line="Host: $HOST  IP: $IP  Gateway: $GATEWAY  Interface: $VM_NET_DEV  MAC: $VM_NET_MAC  MTU: $mtu"
+  [[ "$MTU" != "0" ]] && [[ "$MTU" != "$mtu" ]] && line+=" ($MTU)"
+  info "$line"
   [ -f /etc/resolv.conf ] && grep '^nameserver*' /etc/resolv.conf
   echo
 fi
@@ -452,6 +481,7 @@ else
 
 fi
 
-NET_OPTS+=" -device $ADAPTER,romfile=,netdev=hostnet0,mac=$VM_NET_MAC,id=net0"
+NET_OPTS+=" -device $ADAPTER,id=net0,netdev=hostnet0,romfile=,mac=$VM_NET_MAC"
+[[ "$MTU" != "0" ]] && [[ "$MTU" != "1500" ]] && NET_OPTS+=",host_mtu=$MTU"
 
 return 0

src/reset.sh

@@ -72,6 +72,8 @@ CPU="${CPU// Processor/}"
 CPU="${CPU// Quad core/}"
 CPU="${CPU// Core TM/ Core}"
 CPU="${CPU// with Radeon Graphics/}"
+CPU="${CPU// with Radeon Vega Graphics/}"
+
 [ -z "${CPU// /}" ] && CPU="Unknown"
 
 # Check system