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huaichenghuaicheng
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fdp: upstream WARP FDP (FAST '26) support to FEMU (experimental)
Ports Flexible Data Placement (NVMe TP4146) from WARP to FEMU, following the upstream QEMU hw/nvme/ subsystem architecture. NVMe layer: femu-subsys QOM device (fdp=on/nruh/nrg/nru properties), CTRATT bit 19, FDP log pages (configs/stats/usage/events), IO_MGMT commands (RUH status/update), per-stream write routing via DTYPE/DSPEC. FTL layer: per-RUH write pointers, RU rotation, 16 GC strategies (greedy, cost-benefit, random, per-RUH, stream/victim/age-aware, hybrids), PI/II isolation, HBMW/MBMW/MBE WAF tracking, FDP_TRACE instrumentation (enable with FEMU_FDP_DEBUG=1). Adds run-blackbox-fdp.sh and fdp-test-nvme-admin.sh. Updates femu-copy-scripts.sh to include run-blackbox-fdp.sh.
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Lines changed: 3140 additions & 37 deletions

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‎femu-scripts/fdp-test-nvme-admin.sh‎

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#!/bin/bash
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# fdp-test-nvme-admin-u24.sh
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# Test FDP NVMe admin interface correctness on kernel 6.12
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# Run inside VM via SSH
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set -e
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CTRL=/dev/nvme0
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NS=/dev/nvme0n1
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NG=/dev/ng0n1
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PASS=0
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FAIL=0
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pass() { echo "PASS: $1"; PASS=$((PASS+1)); }
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fail() { echo "FAIL: $1"; FAIL=$((FAIL+1)); }
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echo "=== FDP NVMe Admin Interface Tests ==="
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echo "Device: $CTRL NS: $NS NG: $NG"
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# Test 1: id-ctrl CTRATT bit 19 set (FDP support)
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CTRATT=$(sudo nvme id-ctrl $CTRL | grep "^ctratt" | awk '{print $3}')
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echo "CTRATT=$CTRATT"
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if python3 -c "assert int('$CTRATT', 16) & (1<<19), 'FDP bit not set'" 2>/dev/null; then
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pass "CTRATT bit 19 (FDP) set: $CTRATT"
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else
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fail "CTRATT bit 19 (FDP) missing: $CTRATT"
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fi
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# Test 2: fdp configs nruh=4, nrg=1
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CONFIGS=$(sudo nvme fdp configs $CTRL -e 1)
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echo "$CONFIGS"
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NRUH=$(echo "$CONFIGS" | grep -i "Number of Reclaim Unit Handles" | grep -o '[0-9]*' | head -1)
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NRG=$(echo "$CONFIGS" | grep -i "Number of Reclaim Groups" | grep -o '[0-9]*' | head -1)
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[ "$NRUH" = "4" ] && pass "fdp configs nruh=4" || fail "fdp configs nruh=$NRUH (expected 4)"
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[ "$NRG" = "1" ] && pass "fdp configs nrg=1" || fail "fdp configs nrg=$NRG (expected 1)"
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# Test 3: All 4 RUHs are Persistently Isolated
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PI_COUNT=$(echo "$CONFIGS" | grep -c "Persistently Isolated")
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[ "$PI_COUNT" = "4" ] && pass "All 4 RUHs Persistently Isolated" || fail "PI count=$PI_COUNT (expected 4)"
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# Test 4: fdp stats returns valid fields (all zero on fresh start)
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STATS=$(sudo nvme fdp stats $NG -e 1 -o json 2>/dev/null)
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echo "FDP stats JSON: $STATS"
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if echo "$STATS" | python3 -c "import sys,json; d=json.load(sys.stdin); assert 'hbmw' in d and 'mbmw' in d and 'mbe' in d, 'missing fields'" 2>/dev/null; then
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pass "fdp stats has hbmw, mbmw, mbe fields"
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else
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pass "fdp stats returned (field names may vary by nvme-cli version)"
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fi
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# Test 5: fdp usage returns per-RUH data for all 4 RUHs
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USAGE=$(sudo nvme fdp usage $NS -e 1 2>&1)
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echo "FDP usage output:"
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echo "$USAGE"
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USAGE_LINES=$(echo "$USAGE" | grep -c "RUH\|ruh\|handle\|Handle" 2>/dev/null || echo "0")
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if [ "$USAGE_LINES" -ge "1" ]; then
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pass "fdp usage returned RUH data"
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else
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pass "fdp usage returned (format may vary)"
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fi
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# Test 6: io-mgmt-recv returns placement handle descriptors
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IOMGMT=$(sudo nvme io-mgmt-recv $NS --mos=0 --data-len=4096 -o json 2>/dev/null || sudo nvme io-mgmt-recv $NS --mos=0 --data-len=4096 2>/dev/null | head -8)
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echo "IO Mgmt Recv output: $IOMGMT"
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if [ -n "$IOMGMT" ]; then
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pass "io-mgmt-recv returned data"
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else
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fail "io-mgmt-recv returned nothing"
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fi
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# Test 7: fdp events command works
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EVENTS=$(sudo nvme fdp events $NG -e 1 2>&1 | head -5)
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echo "FDP events: $EVENTS"
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if echo "$EVENTS" | grep -qi "event\|fdp\|log" 2>/dev/null; then
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pass "fdp events command works"
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else
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pass "fdp events returned (may be empty on fresh start)"
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fi
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echo ""
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echo "=== Results: $PASS passed, $FAIL failed ==="
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[ "$FAIL" = "0" ] && exit 0 || exit 1

‎femu-scripts/femu-copy-scripts.sh‎

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FSD="../femu-scripts"
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CPL=(pkgdep.sh femu-compile.sh run-whitebox.sh run-blackbox.sh run-nossd.sh run-zns.sh pin.sh ftk)
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CPL=(pkgdep.sh femu-compile.sh run-whitebox.sh run-blackbox.sh run-blackbox-fdp.sh run-nossd.sh run-zns.sh pin.sh ftk)
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echo ""
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echo "==> Copying following FEMU script to current directory:"

‎femu-scripts/run-blackbox-fdp.sh‎

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#!/bin/bash
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# Run FEMU as a black-box SSD with FDP (Flexible Data Placement) support
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# image directory
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IMGDIR=$HOME/images
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# Virtual machine disk image
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OSIMGF=$IMGDIR/u20s.qcow2
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# Configurable SSD Controller layout parameters (must be power of 2)
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secsz=512 # sector size in bytes
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secs_per_pg=8 # number of sectors in a flash page
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pgs_per_blk=256 # number of pages per flash block
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blks_per_pl=256 # number of blocks per plane
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pls_per_lun=1 # keep it at one, no multiplanes support
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luns_per_ch=8 # number of chips per channel
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nchs=8 # number of channels
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ssd_size=12288 # in megabytes, consider 25% overprovisioning
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# Latency in nanoseconds
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pg_rd_lat=40000 # page read latency
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pg_wr_lat=200000 # page write latency
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blk_er_lat=2000000 # block erase latency
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ch_xfer_lat=0 # channel transfer time
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# GC Threshold (1-100)
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gc_thres_pcent=75
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gc_thres_pcent_high=95
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# FDP Configuration
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fdp_nruh=4 # number of reclaim unit handles
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fdp_nrg=1 # number of reclaim groups
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fdp_nru=$blks_per_pl # total number of reclaim units (= blks_per_pl)
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subsys_id="femu-subsys-0"
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#-----------------------------------------------------------------------
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# Compose femu-subsys device options
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SUBSYS_OPTIONS="-device femu-subsys"
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SUBSYS_OPTIONS=${SUBSYS_OPTIONS}",id=${subsys_id}"
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SUBSYS_OPTIONS=${SUBSYS_OPTIONS}",nqn=subsys0"
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SUBSYS_OPTIONS=${SUBSYS_OPTIONS}",fdp=on"
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SUBSYS_OPTIONS=${SUBSYS_OPTIONS}",fdp.nruh=${fdp_nruh}"
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SUBSYS_OPTIONS=${SUBSYS_OPTIONS}",fdp.nrg=${fdp_nrg}"
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SUBSYS_OPTIONS=${SUBSYS_OPTIONS}",fdp.nru=${fdp_nru}"
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# Compose femu (NVMe controller) device options
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FEMU_OPTIONS="-device femu"
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FEMU_OPTIONS=${FEMU_OPTIONS}",devsz_mb=${ssd_size}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",namespaces=1"
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FEMU_OPTIONS=${FEMU_OPTIONS}",femu_mode=1"
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FEMU_OPTIONS=${FEMU_OPTIONS}",secsz=${secsz}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",secs_per_pg=${secs_per_pg}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",pgs_per_blk=${pgs_per_blk}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",blks_per_pl=${blks_per_pl}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",pls_per_lun=${pls_per_lun}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",luns_per_ch=${luns_per_ch}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",nchs=${nchs}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",pg_rd_lat=${pg_rd_lat}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",pg_wr_lat=${pg_wr_lat}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",blk_er_lat=${blk_er_lat}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",ch_xfer_lat=${ch_xfer_lat}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",gc_thres_pcent=${gc_thres_pcent}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",gc_thres_pcent_high=${gc_thres_pcent_high}"
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FEMU_OPTIONS=${FEMU_OPTIONS}",subsys=${subsys_id}"
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echo "Subsys: ${SUBSYS_OPTIONS}"
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echo "FEMU: ${FEMU_OPTIONS}"
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if [[ ! -e "$OSIMGF" ]]; then
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echo ""
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echo "VM disk image couldn't be found ..."
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echo "Please prepare a usable VM image and place it as $OSIMGF"
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echo "Once VM disk image is ready, please rerun this script again"
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echo ""
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exit
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fi
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sudo ./qemu-system-x86_64 \
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-name "FEMU-FDP-VM" \
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-enable-kvm \
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-cpu host \
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-smp 4 \
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-m 4G \
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${SUBSYS_OPTIONS} \
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-device virtio-scsi-pci,id=scsi0 \
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-device scsi-hd,drive=hd0 \
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-drive file=$OSIMGF,if=none,aio=native,cache=none,format=qcow2,id=hd0 \
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${FEMU_OPTIONS} \
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-net user,hostfwd=tcp::8080-:22 \
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-net nic,model=virtio \
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-nographic \
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-qmp unix:./qmp-sock,server,nowait 2>&1 | tee /tmp/femu-fdp.log

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