Import QEMU upstream snapshot d2e570c

Upstream: https://gitlab.com/qemu-project/qemu.git

Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475

scripts/rdma-migration-helper.sh

@@ -0,0 +1,109 @@
+#!/bin/bash
+
+# Copied from blktests
+get_ipv4_addr()
+{
+    ip -4 -o addr show dev "$1" |
+        sed -n 's/.*[[:blank:]]inet[[:blank:]]*\([^[:blank:]/]*\).*/\1/p' |
+        head -1 | tr -d '\n'
+}
+
+get_ipv6_addr() {
+    ipv6=$(ip -6 -o addr show dev "$1" |
+        sed -n 's/.*[[:blank:]]inet6[[:blank:]]*\([^[:blank:]/]*\).*/\1/p' |
+        head -1 | tr -d '\n')
+
+    [ $? -eq 0 ] || return
+
+    if [[ "$ipv6" =~ ^fe80: ]]; then
+        echo -n "[$ipv6%$1]"
+    else
+        echo -n "[$ipv6]"
+    fi
+}
+
+# existing rdma interfaces
+rdma_interfaces()
+{
+    rdma link show | sed -nE 's/^link .* netdev ([^ ]+).*$/\1 /p' |
+    grep -Ev '^(lo|tun|tap)'
+}
+
+# existing valid ipv4 interfaces
+ipv4_interfaces()
+{
+    ip -o addr show | awk '/inet / {print $2}' | grep -Ev '^(lo|tun|tap)'
+}
+
+ipv6_interfaces()
+{
+    ip -o addr show | awk '/inet6 / {print $2}' | grep -Ev '^(lo|tun|tap)'
+}
+
+rdma_rxe_detect()
+{
+    family=$1
+    for r in $(rdma_interfaces)
+    do
+        "$family"_interfaces | grep -qw $r && get_"$family"_addr $r && return
+    done
+
+    return 1
+}
+
+rdma_rxe_setup()
+{
+    family=$1
+    for i in $("$family"_interfaces)
+    do
+        if rdma_interfaces | grep -qw $i; then
+            echo "$family: Reuse the existing rdma/rxe ${i}_rxe" \
+                 "for $i with $(get_"$family"_addr $i)"
+            return
+        fi
+
+        rdma link add "${i}_rxe" type rxe netdev "$i" && {
+            echo "$family: Setup new rdma/rxe ${i}_rxe" \
+                 "for $i with $(get_"$family"_addr $i)"
+            return
+        }
+    done
+
+    echo "$family: Failed to setup any new rdma/rxe link" >&2
+    return 1
+}
+
+rdma_rxe_clean()
+{
+    modprobe -r rdma_rxe
+}
+
+IP_FAMILY=${IP_FAMILY:-ipv4}
+if [ "$IP_FAMILY" != "ipv6" ] && [ "$IP_FAMILY" != "ipv4" ]; then
+    echo "Unknown ip family '$IP_FAMILY', only ipv4 or ipv6 is supported." >&2
+    exit 1
+fi
+
+operation=${1:-detect}
+
+command -v rdma >/dev/null || {
+    echo "Command 'rdma' is not available, please install it first." >&2
+    exit 1
+}
+
+if [ "$operation" == "setup" ] || [ "$operation" == "clean" ]; then
+    [ "$UID" == 0 ] || {
+        echo "Root privilege is required to setup/clean a rdma/rxe link" >&2
+        exit 1
+    }
+    if [ "$operation" == "setup" ]; then
+        rdma_rxe_setup ipv4
+        rdma_rxe_setup ipv6
+    else
+        rdma_rxe_clean
+    fi
+elif [ "$operation" == "detect" ]; then
+    rdma_rxe_detect "$IP_FAMILY"
+else
+    echo "Usage: $0 [setup | detect | clean]"
+fi